+++ /dev/null
-/*
- * Copyright (c) 2002-2014 Apple Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-//
-// This file implements a simple write-ahead journaling layer.
-// In theory any file system can make use of it by calling these
-// functions when the fs wants to modify meta-data blocks. See
-// vfs_journal.h for a more detailed description of the api and
-// data structures.
-//
-// Dominic Giampaolo (dbg@apple.com)
-//
-
-#ifdef KERNEL
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/file_internal.h>
-#include <sys/stat.h>
-#include <sys/buf_internal.h>
-#include <sys/proc_internal.h>
-#include <sys/mount_internal.h>
-#include <sys/namei.h>
-#include <sys/vnode_internal.h>
-#include <sys/ioctl.h>
-#include <sys/tty.h>
-#include <sys/ubc.h>
-#include <sys/malloc.h>
-#include <kern/task.h>
-#include <kern/thread.h>
-#include <kern/kalloc.h>
-#include <sys/disk.h>
-#include <sys/kdebug.h>
-#include <miscfs/specfs/specdev.h>
-#include <libkern/OSAtomic.h> /* OSAddAtomic */
-
-kern_return_t thread_terminate(thread_t);
-
-/*
- * Set sysctl vfs.generic.jnl.kdebug.trim=1 to enable KERNEL_DEBUG_CONSTANT
- * logging of trim-related calls within the journal. (They're
- * disabled by default because there can be a lot of these events,
- * and we don't want to overwhelm the kernel debug buffer. If you
- * want to watch these events in particular, just set the sysctl.)
- */
-static int jnl_kdebug = 0;
-SYSCTL_DECL(_vfs_generic);
-SYSCTL_NODE(_vfs_generic, OID_AUTO, jnl, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Journal");
-SYSCTL_NODE(_vfs_generic_jnl, OID_AUTO, kdebug, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Journal kdebug");
-SYSCTL_INT(_vfs_generic_jnl_kdebug, OID_AUTO, trim, CTLFLAG_RW|CTLFLAG_LOCKED, &jnl_kdebug, 0, "Enable kdebug logging for journal TRIM");
-
-#define DBG_JOURNAL_FLUSH FSDBG_CODE(DBG_JOURNAL, 1)
-#define DBG_JOURNAL_TRIM_ADD FSDBG_CODE(DBG_JOURNAL, 2)
-#define DBG_JOURNAL_TRIM_REMOVE FSDBG_CODE(DBG_JOURNAL, 3)
-#define DBG_JOURNAL_TRIM_REMOVE_PENDING FSDBG_CODE(DBG_JOURNAL, 4)
-#define DBG_JOURNAL_TRIM_REALLOC FSDBG_CODE(DBG_JOURNAL, 5)
-#define DBG_JOURNAL_TRIM_FLUSH FSDBG_CODE(DBG_JOURNAL, 6)
-#define DBG_JOURNAL_TRIM_UNMAP FSDBG_CODE(DBG_JOURNAL, 7)
-
-/*
- * Cap the journal max size to 2GB. On HFS, it will attempt to occupy
- * a full allocation block if the current size is smaller than the allocation
- * block on which it resides. Once we hit the exabyte filesystem range, then
- * it will use 2GB allocation blocks. As a result, make the cap 2GB.
- */
-#define MAX_JOURNAL_SIZE 0x80000000U
-
-#include <sys/sdt.h> /* DTRACE_IO1 */
-#else
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdarg.h>
-#include <sys/types.h>
-#include "compat.h"
-
-#endif /* KERNEL */
-
-#include "vfs_journal.h"
-
-#include <sys/kdebug.h>
-
-#if 0
-#undef KERNEL_DEBUG
-#define KERNEL_DEBUG KERNEL_DEBUG_CONSTANT
-#endif
-
-
-#ifndef CONFIG_HFS_TRIM
-#define CONFIG_HFS_TRIM 0
-#endif
-
-
-#if JOURNALING
-
-//
-// By default, we grow the list of extents to trim by 4K at a time.
-// We'll opt to flush a transaction if it contains at least
-// JOURNAL_FLUSH_TRIM_EXTENTS extents to be trimmed (even if the number
-// of modified blocks is small).
-//
-enum {
- JOURNAL_DEFAULT_TRIM_BYTES = 4096,
- JOURNAL_DEFAULT_TRIM_EXTENTS = JOURNAL_DEFAULT_TRIM_BYTES / sizeof(dk_extent_t),
- JOURNAL_FLUSH_TRIM_EXTENTS = JOURNAL_DEFAULT_TRIM_EXTENTS * 15 / 16
-};
-
-unsigned int jnl_trim_flush_limit = JOURNAL_FLUSH_TRIM_EXTENTS;
-SYSCTL_UINT (_kern, OID_AUTO, jnl_trim_flush, CTLFLAG_RW, &jnl_trim_flush_limit, 0, "number of trimmed extents to cause a journal flush");
-
-/* XXX next prototype should be from libsa/stdlib.h> but conflicts libkern */
-__private_extern__ void qsort(
- void * array,
- size_t nmembers,
- size_t member_size,
- int (*)(const void *, const void *));
-
-
-
-// number of bytes to checksum in a block_list_header
-// NOTE: this should be enough to clear out the header
-// fields as well as the first entry of binfo[]
-#define BLHDR_CHECKSUM_SIZE 32
-
-static void lock_condition(journal *jnl, boolean_t *condition, const char *condition_name);
-static void wait_condition(journal *jnl, boolean_t *condition, const char *condition_name);
-static void unlock_condition(journal *jnl, boolean_t *condition);
-static void finish_end_thread(transaction *tr);
-static void write_header_thread(journal *jnl);
-static int finish_end_transaction(transaction *tr, errno_t (*callback)(void*), void *callback_arg);
-static int end_transaction(transaction *tr, int force_it, errno_t (*callback)(void*), void *callback_arg, boolean_t drop_lock, boolean_t must_wait);
-static void abort_transaction(journal *jnl, transaction *tr);
-static void dump_journal(journal *jnl);
-
-static __inline__ void lock_oldstart(journal *jnl);
-static __inline__ void unlock_oldstart(journal *jnl);
-static __inline__ void lock_flush(journal *jnl);
-static __inline__ void unlock_flush(journal *jnl);
-
-
-//
-// 3105942 - Coalesce writes to the same block on journal replay
-//
-
-typedef struct bucket {
- off_t block_num;
- uint32_t jnl_offset;
- uint32_t block_size;
- int32_t cksum;
-} bucket;
-
-#define STARTING_BUCKETS 256
-
-static int add_block(journal *jnl, struct bucket **buf_ptr, off_t block_num, size_t size, size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr);
-static int grow_table(struct bucket **buf_ptr, int num_buckets, int new_size);
-static int lookup_bucket(struct bucket **buf_ptr, off_t block_num, int num_full);
-static int do_overlap(journal *jnl, struct bucket **buf_ptr, int blk_index, off_t block_num, size_t size, size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr);
-static int insert_block(journal *jnl, struct bucket **buf_ptr, int blk_index, off_t num, size_t size, size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr, int overwriting);
-
-#define CHECK_JOURNAL(jnl) \
- do { \
- if (jnl == NULL) { \
- panic("%s:%d: null journal ptr?\n", __FILE__, __LINE__); \
- } \
- if (jnl->jdev == NULL) { \
- panic("%s:%d: jdev is null!\n", __FILE__, __LINE__); \
- } \
- if (jnl->fsdev == NULL) { \
- panic("%s:%d: fsdev is null!\n", __FILE__, __LINE__); \
- } \
- if (jnl->jhdr->magic != JOURNAL_HEADER_MAGIC) { \
- panic("%s:%d: jhdr magic corrupted (0x%x != 0x%x)\n", \
- __FILE__, __LINE__, jnl->jhdr->magic, JOURNAL_HEADER_MAGIC); \
- } \
- if ( jnl->jhdr->start <= 0 \
- || jnl->jhdr->start > jnl->jhdr->size) { \
- panic("%s:%d: jhdr start looks bad (0x%llx max size 0x%llx)\n", \
- __FILE__, __LINE__, jnl->jhdr->start, jnl->jhdr->size); \
- } \
- if ( jnl->jhdr->end <= 0 \
- || jnl->jhdr->end > jnl->jhdr->size) { \
- panic("%s:%d: jhdr end looks bad (0x%llx max size 0x%llx)\n", \
- __FILE__, __LINE__, jnl->jhdr->end, jnl->jhdr->size); \
- } \
- } while(0)
-
-#define CHECK_TRANSACTION(tr) \
- do { \
- if (tr == NULL) { \
- panic("%s:%d: null transaction ptr?\n", __FILE__, __LINE__); \
- } \
- if (tr->jnl == NULL) { \
- panic("%s:%d: null tr->jnl ptr?\n", __FILE__, __LINE__); \
- } \
- if (tr->blhdr != (block_list_header *)tr->tbuffer) { \
- panic("%s:%d: blhdr (%p) != tbuffer (%p)\n", __FILE__, __LINE__, tr->blhdr, tr->tbuffer); \
- } \
- if (tr->total_bytes < 0) { \
- panic("%s:%d: tr total_bytes looks bad: %d\n", __FILE__, __LINE__, tr->total_bytes); \
- } \
- if (tr->journal_start < 0) { \
- panic("%s:%d: tr journal start looks bad: 0x%llx\n", __FILE__, __LINE__, tr->journal_start); \
- } \
- if (tr->journal_end < 0) { \
- panic("%s:%d: tr journal end looks bad: 0x%llx\n", __FILE__, __LINE__, tr->journal_end); \
- } \
- if (tr->blhdr && (tr->blhdr->max_blocks <= 0 || tr->blhdr->max_blocks > (tr->jnl->jhdr->size/tr->jnl->jhdr->jhdr_size))) { \
- panic("%s:%d: tr blhdr max_blocks looks bad: %d\n", __FILE__, __LINE__, tr->blhdr->max_blocks); \
- } \
- } while(0)
-
-
-
-//
-// this isn't a great checksum routine but it will do for now.
-// we use it to checksum the journal header and the block list
-// headers that are at the start of each transaction.
-//
-static unsigned int
-calc_checksum(char *ptr, int len)
-{
- int i;
- unsigned int cksum=0;
-
- // this is a lame checksum but for now it'll do
- for(i = 0; i < len; i++, ptr++) {
- cksum = (cksum << 8) ^ (cksum + *(unsigned char *)ptr);
- }
-
- return (~cksum);
-}
-
-//
-// Journal Locking
-//
-lck_grp_attr_t * jnl_group_attr;
-lck_attr_t * jnl_lock_attr;
-lck_grp_t * jnl_mutex_group;
-
-void
-journal_init(void)
-{
- jnl_lock_attr = lck_attr_alloc_init();
- jnl_group_attr = lck_grp_attr_alloc_init();
- jnl_mutex_group = lck_grp_alloc_init("jnl-mutex", jnl_group_attr);
-}
-
-__inline__ void
-journal_lock(journal *jnl)
-{
- lck_mtx_lock(&jnl->jlock);
- if (jnl->owner) {
- panic ("jnl: owner is %p, expected NULL\n", jnl->owner);
- }
- jnl->owner = current_thread();
-}
-
-__inline__ void
-journal_unlock(journal *jnl)
-{
- jnl->owner = NULL;
- lck_mtx_unlock(&jnl->jlock);
-}
-
-static __inline__ void
-lock_flush(journal *jnl)
-{
- lck_mtx_lock(&jnl->flock);
-}
-
-static __inline__ void
-unlock_flush(journal *jnl)
-{
- lck_mtx_unlock(&jnl->flock);
-}
-
-static __inline__ void
-lock_oldstart(journal *jnl)
-{
- lck_mtx_lock(&jnl->old_start_lock);
-}
-
-static __inline__ void
-unlock_oldstart(journal *jnl)
-{
- lck_mtx_unlock(&jnl->old_start_lock);
-}
-
-
-
-#define JNL_WRITE 0x0001
-#define JNL_READ 0x0002
-#define JNL_HEADER 0x8000
-
-//
-// This function sets up a fake buf and passes it directly to the
-// journal device strategy routine (so that it won't get cached in
-// the block cache.
-//
-// It also handles range checking the i/o so that we don't write
-// outside the journal boundaries and it will wrap the i/o back
-// to the beginning if necessary (skipping over the journal header)
-//
-static size_t
-do_journal_io(journal *jnl, off_t *offset, void *data, size_t len, int direction)
-{
- int err, curlen=len;
- size_t io_sz = 0;
- buf_t bp;
- off_t max_iosize;
- struct bufattr *bap;
- boolean_t was_vm_privileged = FALSE;
- boolean_t need_vm_privilege = FALSE;
-
- if (jnl->fsmount) {
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT)
- need_vm_privilege = TRUE;
- }
-
- if (*offset < 0 || *offset > jnl->jhdr->size) {
- panic("jnl: do_jnl_io: bad offset 0x%llx (max 0x%llx)\n", *offset, jnl->jhdr->size);
- }
-
- if (direction & JNL_WRITE)
- max_iosize = jnl->max_write_size;
- else if (direction & JNL_READ)
- max_iosize = jnl->max_read_size;
- else
- max_iosize = 128 * 1024;
-
-again:
- bp = alloc_io_buf(jnl->jdev, 1);
-
- if (*offset + (off_t)curlen > jnl->jhdr->size && *offset != 0 && jnl->jhdr->size != 0) {
- if (*offset == jnl->jhdr->size) {
- *offset = jnl->jhdr->jhdr_size;
- } else {
- curlen = (off_t)jnl->jhdr->size - *offset;
- }
- }
-
- if (curlen > max_iosize) {
- curlen = max_iosize;
- }
-
- if (curlen <= 0) {
- panic("jnl: do_jnl_io: curlen == %d, offset 0x%llx len %zd\n", curlen, *offset, len);
- }
-
- if (*offset == 0 && (direction & JNL_HEADER) == 0) {
- panic("jnl: request for i/o to jnl-header without JNL_HEADER flag set! (len %d, data %p)\n", curlen, data);
- }
-
- /*
- * As alluded to in the block comment at the top of the function, we use a "fake" iobuf
- * here and issue directly to the disk device that the journal protects since we don't
- * want this to enter the block cache. As a result, we lose the ability to mark it
- * as a metadata buf_t for the layers below us that may care. If we were to
- * simply attach the B_META flag into the b_flags this may confuse things further
- * since this is an iobuf, not a metadata buffer.
- *
- * To address this, we use the extended bufattr struct embedded in the bp.
- * Explicitly mark the buf here as a metadata buffer in its bufattr flags.
- */
- bap = &bp->b_attr;
- bap->ba_flags |= BA_META;
-
- if (direction & JNL_READ)
- buf_setflags(bp, B_READ);
- else {
- /*
- * don't have to set any flags
- */
- vnode_startwrite(jnl->jdev);
- }
- buf_setsize(bp, curlen);
- buf_setcount(bp, curlen);
- buf_setdataptr(bp, (uintptr_t)data);
- buf_setblkno(bp, (daddr64_t) ((jnl->jdev_offset + *offset) / (off_t)jnl->jhdr->jhdr_size));
- buf_setlblkno(bp, (daddr64_t) ((jnl->jdev_offset + *offset) / (off_t)jnl->jhdr->jhdr_size));
-
- if ((direction & JNL_WRITE) && (jnl->flags & JOURNAL_DO_FUA_WRITES)) {
- buf_markfua(bp);
- }
-
- if (need_vm_privilege == TRUE) {
- /*
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- DTRACE_IO1(journal__start, buf_t, bp);
- err = VNOP_STRATEGY(bp);
- if (!err) {
- err = (int)buf_biowait(bp);
- }
- DTRACE_IO1(journal__done, buf_t, bp);
-
- if (need_vm_privilege == TRUE && was_vm_privileged == FALSE)
- set_vm_privilege(FALSE);
-
- free_io_buf(bp);
-
- if (err) {
- printf("jnl: %s: do_jnl_io: strategy err 0x%x\n", jnl->jdev_name, err);
- return 0;
- }
-
- *offset += curlen;
- io_sz += curlen;
-
- if (io_sz != len) {
- // handle wrap-around
- data = (char *)data + curlen;
- curlen = len - io_sz;
- if (*offset >= jnl->jhdr->size) {
- *offset = jnl->jhdr->jhdr_size;
- }
- goto again;
- }
-
- return io_sz;
-}
-
-static size_t
-read_journal_data(journal *jnl, off_t *offset, void *data, size_t len)
-{
- return do_journal_io(jnl, offset, data, len, JNL_READ);
-}
-
-static size_t
-write_journal_data(journal *jnl, off_t *offset, void *data, size_t len)
-{
- return do_journal_io(jnl, offset, data, len, JNL_WRITE);
-}
-
-
-static size_t
-read_journal_header(journal *jnl, void *data, size_t len)
-{
- off_t hdr_offset = 0;
-
- return do_journal_io(jnl, &hdr_offset, data, len, JNL_READ|JNL_HEADER);
-}
-
-static int
-write_journal_header(journal *jnl, int updating_start, uint32_t sequence_num)
-{
- static int num_err_prints = 0;
- int ret=0;
- off_t jhdr_offset = 0;
- struct vfs_context context;
-
- context.vc_thread = current_thread();
- context.vc_ucred = NOCRED;
- //
- // Flush the track cache if we're not doing force-unit-access
- // writes.
- //
- if (!updating_start && (jnl->flags & JOURNAL_DO_FUA_WRITES) == 0) {
-
- dk_synchronize_t sync_request = {
- .options = DK_SYNCHRONIZE_OPTION_BARRIER,
- };
-
- /*
- * If device doesn't support barrier-only flush, or
- * the journal is on a different device, use full flush.
- */
- if (!(jnl->flags & JOURNAL_FEATURE_BARRIER) || (jnl->jdev != jnl->fsdev)) {
- sync_request.options = 0;
- jnl->flush_counter++;
- }
-
- ret = VNOP_IOCTL(jnl->jdev, DKIOCSYNCHRONIZE, (caddr_t)&sync_request, FWRITE, &context);
- }
- if (ret != 0) {
- //
- // Only print this error if it's a different error than the
- // previous one, or if it's the first time for this device
- // or if the total number of printfs is less than 25. We
- // allow for up to 25 printfs to insure that some make it
- // into the on-disk syslog. Otherwise if we only printed
- // one, it's possible it would never make it to the syslog
- // for the root volume and that makes debugging hard.
- //
- if ( ret != jnl->last_flush_err
- || (jnl->flags & JOURNAL_FLUSHCACHE_ERR) == 0
- || num_err_prints++ < 25) {
-
- printf("jnl: %s: flushing fs disk buffer returned 0x%x\n", jnl->jdev_name, ret);
-
- jnl->flags |= JOURNAL_FLUSHCACHE_ERR;
- jnl->last_flush_err = ret;
- }
- }
-
- jnl->jhdr->sequence_num = sequence_num;
- jnl->jhdr->checksum = 0;
- jnl->jhdr->checksum = calc_checksum((char *)jnl->jhdr, JOURNAL_HEADER_CKSUM_SIZE);
-
- if (do_journal_io(jnl, &jhdr_offset, jnl->header_buf, jnl->jhdr->jhdr_size, JNL_WRITE|JNL_HEADER) != (size_t)jnl->jhdr->jhdr_size) {
- printf("jnl: %s: write_journal_header: error writing the journal header!\n", jnl->jdev_name);
- jnl->flags |= JOURNAL_INVALID;
- return -1;
- }
-
- // If we're not doing force-unit-access writes, then we
- // have to flush after writing the journal header so that
- // a future transaction doesn't sneak out to disk before
- // the header does and thus overwrite data that the old
- // journal header refers to. Saw this exact case happen
- // on an IDE bus analyzer with Larry Barras so while it
- // may seem obscure, it's not.
- //
- if (updating_start && (jnl->flags & JOURNAL_DO_FUA_WRITES) == 0) {
-
- dk_synchronize_t sync_request = {
- .options = DK_SYNCHRONIZE_OPTION_BARRIER,
- };
-
- /*
- * If device doesn't support barrier-only flush, or
- * the journal is on a different device, use full flush.
- */
- if (!(jnl->flags & JOURNAL_FEATURE_BARRIER) || (jnl->jdev != jnl->fsdev)) {
- sync_request.options = 0;
- jnl->flush_counter++;
- }
-
- VNOP_IOCTL(jnl->jdev, DKIOCSYNCHRONIZE, (caddr_t)&sync_request, FWRITE, &context);
- }
-
- return 0;
-}
-
-
-
-//
-// this is a work function used to free up transactions that
-// completed. they can't be free'd from buffer_flushed_callback
-// because it is called from deep with the disk driver stack
-// and thus can't do something that would potentially cause
-// paging. it gets called by each of the journal api entry
-// points so stuff shouldn't hang around for too long.
-//
-static void
-free_old_stuff(journal *jnl)
-{
- transaction *tr, *next;
- block_list_header *blhdr=NULL, *next_blhdr=NULL;
-
- if (jnl->tr_freeme == NULL)
- return;
-
- lock_oldstart(jnl);
- tr = jnl->tr_freeme;
- jnl->tr_freeme = NULL;
- unlock_oldstart(jnl);
-
- for(; tr; tr=next) {
- for (blhdr = tr->blhdr; blhdr; blhdr = next_blhdr) {
- next_blhdr = (block_list_header *)((long)blhdr->binfo[0].bnum);
- blhdr->binfo[0].bnum = 0xdeadc0de;
-
- kmem_free(kernel_map, (vm_offset_t)blhdr, tr->tbuffer_size);
-
- KERNEL_DEBUG(0xbbbbc01c, jnl, tr, tr->tbuffer_size, 0, 0);
- }
- next = tr->next;
- FREE_ZONE(tr, sizeof(transaction), M_JNL_TR);
- }
-}
-
-
-
-//
-// This is our callback that lets us know when a buffer has been
-// flushed to disk. It's called from deep within the driver stack
-// and thus is quite limited in what it can do. Notably, it can
-// not initiate any new i/o's or allocate/free memory.
-//
-static void
-buffer_flushed_callback(struct buf *bp, void *arg)
-{
- transaction *tr;
- journal *jnl;
- transaction *ctr, *prev=NULL, *next;
- size_t i;
- int bufsize, amt_flushed, total_bytes;
-
-
- //printf("jnl: buf flush: bp @ 0x%x l/blkno %qd/%qd vp 0x%x tr @ 0x%x\n",
- // bp, buf_lblkno(bp), buf_blkno(bp), buf_vnode(bp), arg);
-
- // snarf out the bits we want
- bufsize = buf_size(bp);
- tr = (transaction *)arg;
-
- // then we've already seen it
- if (tr == NULL) {
- return;
- }
-
- CHECK_TRANSACTION(tr);
-
- jnl = tr->jnl;
-
- CHECK_JOURNAL(jnl);
-
- amt_flushed = tr->num_killed;
- total_bytes = tr->total_bytes;
-
- // update the number of blocks that have been flushed.
- // this buf may represent more than one block so take
- // that into account.
- //
- // OSAddAtomic() returns the value of tr->num_flushed before the add
- //
- amt_flushed += OSAddAtomic(bufsize, &tr->num_flushed);
-
-
- // if this transaction isn't done yet, just return as
- // there is nothing to do.
- //
- // NOTE: we are careful to not reference anything through
- // the tr pointer after doing the OSAddAtomic(). if
- // this if statement fails then we are the last one
- // and then it's ok to dereference "tr".
- //
- if ((amt_flushed + bufsize) < total_bytes) {
- return;
- }
-
- // this will single thread checking the transaction
- lock_oldstart(jnl);
-
- if (tr->total_bytes == (int)0xfbadc0de) {
- // then someone beat us to it...
- unlock_oldstart(jnl);
- return;
- }
-
- // mark this so that we're the owner of dealing with the
- // cleanup for this transaction
- tr->total_bytes = 0xfbadc0de;
-
- if (jnl->flags & JOURNAL_INVALID)
- goto transaction_done;
-
- //printf("jnl: tr 0x%x (0x%llx 0x%llx) in jnl 0x%x completed.\n",
- // tr, tr->journal_start, tr->journal_end, jnl);
-
- // find this entry in the old_start[] index and mark it completed
- for(i = 0; i < sizeof(jnl->old_start)/sizeof(jnl->old_start[0]); i++) {
-
- if ((off_t)(jnl->old_start[i] & ~(0x8000000000000000ULL)) == tr->journal_start) {
- jnl->old_start[i] &= ~(0x8000000000000000ULL);
- break;
- }
- }
-
- if (i >= sizeof(jnl->old_start)/sizeof(jnl->old_start[0])) {
- panic("jnl: buffer_flushed: did not find tr w/start @ %lld (tr %p, jnl %p)\n",
- tr->journal_start, tr, jnl);
- }
-
-
- // if we are here then we need to update the journal header
- // to reflect that this transaction is complete
- if (tr->journal_start == jnl->active_start) {
- jnl->active_start = tr->journal_end;
- tr->journal_start = tr->journal_end = (off_t)0;
- }
-
- // go through the completed_trs list and try to coalesce
- // entries, restarting back at the beginning if we have to.
- for (ctr = jnl->completed_trs; ctr; prev=ctr, ctr=next) {
- if (ctr->journal_start == jnl->active_start) {
- jnl->active_start = ctr->journal_end;
- if (prev) {
- prev->next = ctr->next;
- }
- if (ctr == jnl->completed_trs) {
- jnl->completed_trs = ctr->next;
- }
-
- next = jnl->completed_trs; // this starts us over again
- ctr->next = jnl->tr_freeme;
- jnl->tr_freeme = ctr;
- ctr = NULL;
- } else if (tr->journal_end == ctr->journal_start) {
- ctr->journal_start = tr->journal_start;
- next = jnl->completed_trs; // this starts us over again
- ctr = NULL;
- tr->journal_start = tr->journal_end = (off_t)0;
- } else if (tr->journal_start == ctr->journal_end) {
- ctr->journal_end = tr->journal_end;
- next = ctr->next;
- tr->journal_start = tr->journal_end = (off_t)0;
- } else if (ctr->next && ctr->journal_end == ctr->next->journal_start) {
- // coalesce the next entry with this one and link the next
- // entry in at the head of the tr_freeme list
- next = ctr->next; // temporarily use the "next" variable
- ctr->journal_end = next->journal_end;
- ctr->next = next->next;
- next->next = jnl->tr_freeme; // link in the next guy at the head of the tr_freeme list
- jnl->tr_freeme = next;
-
- next = jnl->completed_trs; // this starts us over again
- ctr = NULL;
- } else {
- next = ctr->next;
- }
- }
-
- // if this is true then we didn't merge with anyone
- // so link ourselves in at the head of the completed
- // transaction list.
- if (tr->journal_start != 0) {
- // put this entry into the correct sorted place
- // in the list instead of just at the head.
- //
-
- prev = NULL;
- for (ctr = jnl->completed_trs; ctr && tr->journal_start > ctr->journal_start; prev=ctr, ctr=ctr->next) {
- // just keep looping
- }
-
- if (ctr == NULL && prev == NULL) {
- jnl->completed_trs = tr;
- tr->next = NULL;
- } else if (ctr == jnl->completed_trs) {
- tr->next = jnl->completed_trs;
- jnl->completed_trs = tr;
- } else {
- tr->next = prev->next;
- prev->next = tr;
- }
- } else {
- // if we're here this tr got merged with someone else so
- // put it on the list to be free'd
- tr->next = jnl->tr_freeme;
- jnl->tr_freeme = tr;
- }
-transaction_done:
- unlock_oldstart(jnl);
-
- unlock_condition(jnl, &jnl->asyncIO);
-}
-
-
-#include <libkern/OSByteOrder.h>
-
-#define SWAP16(x) OSSwapInt16(x)
-#define SWAP32(x) OSSwapInt32(x)
-#define SWAP64(x) OSSwapInt64(x)
-
-
-static void
-swap_journal_header(journal *jnl)
-{
- jnl->jhdr->magic = SWAP32(jnl->jhdr->magic);
- jnl->jhdr->endian = SWAP32(jnl->jhdr->endian);
- jnl->jhdr->start = SWAP64(jnl->jhdr->start);
- jnl->jhdr->end = SWAP64(jnl->jhdr->end);
- jnl->jhdr->size = SWAP64(jnl->jhdr->size);
- jnl->jhdr->blhdr_size = SWAP32(jnl->jhdr->blhdr_size);
- jnl->jhdr->checksum = SWAP32(jnl->jhdr->checksum);
- jnl->jhdr->jhdr_size = SWAP32(jnl->jhdr->jhdr_size);
- jnl->jhdr->sequence_num = SWAP32(jnl->jhdr->sequence_num);
-}
-
-static void
-swap_block_list_header(journal *jnl, block_list_header *blhdr)
-{
- int i;
-
- blhdr->max_blocks = SWAP16(blhdr->max_blocks);
- blhdr->num_blocks = SWAP16(blhdr->num_blocks);
- blhdr->bytes_used = SWAP32(blhdr->bytes_used);
- blhdr->checksum = SWAP32(blhdr->checksum);
- blhdr->flags = SWAP32(blhdr->flags);
-
- if (blhdr->num_blocks >= ((jnl->jhdr->blhdr_size / sizeof(block_info)) - 1)) {
- printf("jnl: %s: blhdr num blocks looks suspicious (%d / blhdr size %d). not swapping.\n", jnl->jdev_name, blhdr->num_blocks, jnl->jhdr->blhdr_size);
- return;
- }
-
- for(i = 0; i < blhdr->num_blocks; i++) {
- blhdr->binfo[i].bnum = SWAP64(blhdr->binfo[i].bnum);
- blhdr->binfo[i].u.bi.bsize = SWAP32(blhdr->binfo[i].u.bi.bsize);
- blhdr->binfo[i].u.bi.b.cksum = SWAP32(blhdr->binfo[i].u.bi.b.cksum);
- }
-}
-
-
-static int
-update_fs_block(journal *jnl, void *block_ptr, off_t fs_block, size_t bsize)
-{
- int ret;
- struct buf *oblock_bp=NULL;
- boolean_t was_vm_privileged = FALSE;
-
-
- // first read the block we want.
- ret = buf_meta_bread(jnl->fsdev, (daddr64_t)fs_block, bsize, NOCRED, &oblock_bp);
- if (ret != 0) {
- printf("jnl: %s: update_fs_block: error reading fs block # %lld! (ret %d)\n", jnl->jdev_name, fs_block, ret);
-
- if (oblock_bp) {
- buf_brelse(oblock_bp);
- oblock_bp = NULL;
- }
-
- // let's try to be aggressive here and just re-write the block
- oblock_bp = buf_getblk(jnl->fsdev, (daddr64_t)fs_block, bsize, 0, 0, BLK_META);
- if (oblock_bp == NULL) {
- printf("jnl: %s: update_fs_block: buf_getblk() for %lld failed! failing update.\n", jnl->jdev_name, fs_block);
- return -1;
- }
- }
-
- // make sure it's the correct size.
- if (buf_size(oblock_bp) != bsize) {
- buf_brelse(oblock_bp);
- return -1;
- }
-
- // copy the journal data over top of it
- memcpy((char *)buf_dataptr(oblock_bp), block_ptr, bsize);
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- ret = VNOP_BWRITE(oblock_bp);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
-
- if (ret != 0) {
- printf("jnl: %s: update_fs_block: failed to update block %lld (ret %d)\n", jnl->jdev_name, fs_block,ret);
- return ret;
- }
- // and now invalidate it so that if someone else wants to read
- // it in a different size they'll be able to do it.
- ret = buf_meta_bread(jnl->fsdev, (daddr64_t)fs_block, bsize, NOCRED, &oblock_bp);
- if (oblock_bp) {
- buf_markinvalid(oblock_bp);
- buf_brelse(oblock_bp);
- }
-
- return 0;
-}
-
-static int
-grow_table(struct bucket **buf_ptr, int num_buckets, int new_size)
-{
- struct bucket *newBuf;
- int current_size = num_buckets, i;
-
- // return if newsize is less than the current size
- if (new_size < num_buckets) {
- return current_size;
- }
-
- if ((MALLOC(newBuf, struct bucket *, new_size*sizeof(struct bucket), M_TEMP, M_WAITOK)) == NULL) {
- printf("jnl: grow_table: no memory to expand coalesce buffer!\n");
- return -1;
- }
-
- // printf("jnl: lookup_bucket: expanded co_buf to %d elems\n", new_size);
-
- // copy existing elements
- bcopy(*buf_ptr, newBuf, num_buckets*sizeof(struct bucket));
-
- // initialize the new ones
- for(i = num_buckets; i < new_size; i++) {
- newBuf[i].block_num = (off_t)-1;
- }
-
- // free the old container
- FREE(*buf_ptr, M_TEMP);
-
- // reset the buf_ptr
- *buf_ptr = newBuf;
-
- return new_size;
-}
-
-static int
-lookup_bucket(struct bucket **buf_ptr, off_t block_num, int num_full)
-{
- int lo, hi, index, matches, i;
-
- if (num_full == 0) {
- return 0; // table is empty, so insert at index=0
- }
-
- lo = 0;
- hi = num_full - 1;
- index = -1;
-
- // perform binary search for block_num
- do {
- int mid = (hi - lo)/2 + lo;
- off_t this_num = (*buf_ptr)[mid].block_num;
-
- if (block_num == this_num) {
- index = mid;
- break;
- }
-
- if (block_num < this_num) {
- hi = mid;
- continue;
- }
-
- if (block_num > this_num) {
- lo = mid + 1;
- continue;
- }
- } while (lo < hi);
-
- // check if lo and hi converged on the match
- if (block_num == (*buf_ptr)[hi].block_num) {
- index = hi;
- }
-
- // if no existing entry found, find index for new one
- if (index == -1) {
- index = (block_num < (*buf_ptr)[hi].block_num) ? hi : hi + 1;
- } else {
- // make sure that we return the right-most index in the case of multiple matches
- matches = 0;
- i = index + 1;
- while (i < num_full && block_num == (*buf_ptr)[i].block_num) {
- matches++;
- i++;
- }
-
- index += matches;
- }
-
- return index;
-}
-
-static int
-insert_block(journal *jnl, struct bucket **buf_ptr, int blk_index, off_t num, size_t size, size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr, int overwriting)
-{
- if (!overwriting) {
- // grow the table if we're out of space
- if (*num_full_ptr >= *num_buckets_ptr) {
- int new_size = *num_buckets_ptr * 2;
- int grow_size = grow_table(buf_ptr, *num_buckets_ptr, new_size);
-
- if (grow_size < new_size) {
- printf("jnl: %s: add_block: grow_table returned an error!\n", jnl->jdev_name);
- return -1;
- }
-
- *num_buckets_ptr = grow_size; //update num_buckets to reflect the new size
- }
-
- // if we're not inserting at the end, we need to bcopy
- if (blk_index != *num_full_ptr) {
- bcopy( (*buf_ptr)+(blk_index), (*buf_ptr)+(blk_index+1), (*num_full_ptr-blk_index)*sizeof(struct bucket) );
- }
-
- (*num_full_ptr)++; // increment only if we're not overwriting
- }
-
- // sanity check the values we're about to add
- if ((off_t)offset >= jnl->jhdr->size) {
- offset = jnl->jhdr->jhdr_size + (offset - jnl->jhdr->size);
- }
- if (size <= 0) {
- panic("jnl: insert_block: bad size in insert_block (%zd)\n", size);
- }
-
- (*buf_ptr)[blk_index].block_num = num;
- (*buf_ptr)[blk_index].block_size = size;
- (*buf_ptr)[blk_index].jnl_offset = offset;
- (*buf_ptr)[blk_index].cksum = cksum;
-
- return blk_index;
-}
-
-static int
-do_overlap(journal *jnl, struct bucket **buf_ptr, int blk_index, off_t block_num, size_t size, __unused size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr)
-{
- int num_to_remove, index, i, overwrite, err;
- size_t jhdr_size = jnl->jhdr->jhdr_size, new_offset;
- off_t overlap, block_start, block_end;
-
- block_start = block_num*jhdr_size;
- block_end = block_start + size;
- overwrite = (block_num == (*buf_ptr)[blk_index].block_num && size >= (*buf_ptr)[blk_index].block_size);
-
- // first, eliminate any overlap with the previous entry
- if (blk_index != 0 && !overwrite) {
- off_t prev_block_start = (*buf_ptr)[blk_index-1].block_num*jhdr_size;
- off_t prev_block_end = prev_block_start + (*buf_ptr)[blk_index-1].block_size;
- overlap = prev_block_end - block_start;
- if (overlap > 0) {
- if (overlap % jhdr_size != 0) {
- panic("jnl: do_overlap: overlap with previous entry not a multiple of %zd\n", jhdr_size);
- }
-
- // if the previous entry completely overlaps this one, we need to break it into two pieces.
- if (prev_block_end > block_end) {
- off_t new_num = block_end / jhdr_size;
- size_t new_size = prev_block_end - block_end;
-
- new_offset = (*buf_ptr)[blk_index-1].jnl_offset + (block_end - prev_block_start);
-
- err = insert_block(jnl, buf_ptr, blk_index, new_num, new_size, new_offset, cksum, num_buckets_ptr, num_full_ptr, 0);
- if (err < 0) {
- panic("jnl: do_overlap: error inserting during pre-overlap\n");
- }
- }
-
- // Regardless, we need to truncate the previous entry to the beginning of the overlap
- (*buf_ptr)[blk_index-1].block_size = block_start - prev_block_start;
- (*buf_ptr)[blk_index-1].cksum = 0; // have to blow it away because there's no way to check it
- }
- }
-
- // then, bail out fast if there's no overlap with the entries that follow
- if (!overwrite && block_end <= (off_t)((*buf_ptr)[blk_index].block_num*jhdr_size)) {
- return 0; // no overlap, no overwrite
- } else if (overwrite && (blk_index + 1 >= *num_full_ptr || block_end <= (off_t)((*buf_ptr)[blk_index+1].block_num*jhdr_size))) {
-
- (*buf_ptr)[blk_index].cksum = cksum; // update this
- return 1; // simple overwrite
- }
-
- // Otherwise, find all cases of total and partial overlap. We use the special
- // block_num of -2 to designate entries that are completely overlapped and must
- // be eliminated. The block_num, size, and jnl_offset of partially overlapped
- // entries must be adjusted to keep the array consistent.
- index = blk_index;
- num_to_remove = 0;
- while (index < *num_full_ptr && block_end > (off_t)((*buf_ptr)[index].block_num*jhdr_size)) {
- if (block_end >= (off_t)(((*buf_ptr)[index].block_num*jhdr_size + (*buf_ptr)[index].block_size))) {
- (*buf_ptr)[index].block_num = -2; // mark this for deletion
- num_to_remove++;
- } else {
- overlap = block_end - (*buf_ptr)[index].block_num*jhdr_size;
- if (overlap > 0) {
- if (overlap % jhdr_size != 0) {
- panic("jnl: do_overlap: overlap of %lld is not multiple of %zd\n", overlap, jhdr_size);
- }
-
- // if we partially overlap this entry, adjust its block number, jnl offset, and size
- (*buf_ptr)[index].block_num += (overlap / jhdr_size); // make sure overlap is multiple of jhdr_size, or round up
- (*buf_ptr)[index].cksum = 0;
-
- new_offset = (*buf_ptr)[index].jnl_offset + overlap; // check for wrap-around
- if ((off_t)new_offset >= jnl->jhdr->size) {
- new_offset = jhdr_size + (new_offset - jnl->jhdr->size);
- }
- (*buf_ptr)[index].jnl_offset = new_offset;
-
- (*buf_ptr)[index].block_size -= overlap; // sanity check for negative value
- if ((*buf_ptr)[index].block_size <= 0) {
- panic("jnl: do_overlap: after overlap, new block size is invalid (%u)\n", (*buf_ptr)[index].block_size);
- // return -1; // if above panic is removed, return -1 for error
- }
- }
-
- }
-
- index++;
- }
-
- // bcopy over any completely overlapped entries, starting at the right (where the above loop broke out)
- index--; // start with the last index used within the above loop
- while (index >= blk_index) {
- if ((*buf_ptr)[index].block_num == -2) {
- if (index == *num_full_ptr-1) {
- (*buf_ptr)[index].block_num = -1; // it's the last item in the table... just mark as free
- } else {
- bcopy( (*buf_ptr)+(index+1), (*buf_ptr)+(index), (*num_full_ptr - (index + 1)) * sizeof(struct bucket) );
- }
- (*num_full_ptr)--;
- }
- index--;
- }
-
- // eliminate any stale entries at the end of the table
- for(i = *num_full_ptr; i < (*num_full_ptr + num_to_remove); i++) {
- (*buf_ptr)[i].block_num = -1;
- }
-
- return 0; // if we got this far, we need to insert the entry into the table (rather than overwrite)
-}
-
-// PR-3105942: Coalesce writes to the same block in journal replay
-// We coalesce writes by maintaining a dynamic sorted array of physical disk blocks
-// to be replayed and the corresponding location in the journal which contains
-// the most recent data for those blocks. The array is "played" once the all the
-// blocks in the journal have been coalesced. The code for the case of conflicting/
-// overlapping writes to a single block is the most dense. Because coalescing can
-// disrupt the existing time-ordering of blocks in the journal playback, care
-// is taken to catch any overlaps and keep the array consistent.
-static int
-add_block(journal *jnl, struct bucket **buf_ptr, off_t block_num, size_t size, __unused size_t offset, int32_t cksum, int *num_buckets_ptr, int *num_full_ptr)
-{
- int blk_index, overwriting;
-
- // on return from lookup_bucket(), blk_index is the index into the table where block_num should be
- // inserted (or the index of the elem to overwrite).
- blk_index = lookup_bucket( buf_ptr, block_num, *num_full_ptr);
-
- // check if the index is within bounds (if we're adding this block to the end of
- // the table, blk_index will be equal to num_full)
- if (blk_index < 0 || blk_index > *num_full_ptr) {
- //printf("jnl: add_block: trouble adding block to co_buf\n");
- return -1;
- } // else printf("jnl: add_block: adding block 0x%llx at i=%d\n", block_num, blk_index);
-
- // Determine whether we're overwriting an existing entry by checking for overlap
- overwriting = do_overlap(jnl, buf_ptr, blk_index, block_num, size, offset, cksum, num_buckets_ptr, num_full_ptr);
- if (overwriting < 0) {
- return -1; // if we got an error, pass it along
- }
-
- // returns the index, or -1 on error
- blk_index = insert_block(jnl, buf_ptr, blk_index, block_num, size, offset, cksum, num_buckets_ptr, num_full_ptr, overwriting);
-
- return blk_index;
-}
-
-static int
-replay_journal(journal *jnl)
-{
- int i, bad_blocks=0;
- unsigned int orig_checksum, checksum, check_block_checksums = 0;
- size_t ret;
- size_t max_bsize = 0; /* protected by block_ptr */
- block_list_header *blhdr;
- off_t offset, txn_start_offset=0, blhdr_offset, orig_jnl_start;
- char *buff, *block_ptr=NULL;
- struct bucket *co_buf;
- int num_buckets = STARTING_BUCKETS, num_full, check_past_jnl_end = 1, in_uncharted_territory=0;
- uint32_t last_sequence_num = 0;
- int replay_retry_count = 0;
-
- // wrap the start ptr if it points to the very end of the journal
- if (jnl->jhdr->start == jnl->jhdr->size) {
- jnl->jhdr->start = jnl->jhdr->jhdr_size;
- }
- if (jnl->jhdr->end == jnl->jhdr->size) {
- jnl->jhdr->end = jnl->jhdr->jhdr_size;
- }
-
- if (jnl->jhdr->start == jnl->jhdr->end) {
- return 0;
- }
-
- orig_jnl_start = jnl->jhdr->start;
-
- // allocate memory for the header_block. we'll read each blhdr into this
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&buff, jnl->jhdr->blhdr_size, VM_KERN_MEMORY_FILE)) {
- printf("jnl: %s: replay_journal: no memory for block buffer! (%d bytes)\n",
- jnl->jdev_name, jnl->jhdr->blhdr_size);
- return -1;
- }
-
- // allocate memory for the coalesce buffer
- if ((MALLOC(co_buf, struct bucket *, num_buckets*sizeof(struct bucket), M_TEMP, M_WAITOK)) == NULL) {
- printf("jnl: %s: replay_journal: no memory for coalesce buffer!\n", jnl->jdev_name);
- return -1;
- }
-
-restart_replay:
-
- // initialize entries
- for(i = 0; i < num_buckets; i++) {
- co_buf[i].block_num = -1;
- }
- num_full = 0; // empty at first
-
-
- printf("jnl: %s: replay_journal: from: %lld to: %lld (joffset 0x%llx)\n",
- jnl->jdev_name, jnl->jhdr->start, jnl->jhdr->end, jnl->jdev_offset);
-
- while (check_past_jnl_end || jnl->jhdr->start != jnl->jhdr->end) {
- offset = blhdr_offset = jnl->jhdr->start;
- ret = read_journal_data(jnl, &offset, buff, jnl->jhdr->blhdr_size);
- if (ret != (size_t)jnl->jhdr->blhdr_size) {
- printf("jnl: %s: replay_journal: Could not read block list header block @ 0x%llx!\n", jnl->jdev_name, offset);
- bad_blocks = 1;
- goto bad_txn_handling;
- }
-
- blhdr = (block_list_header *)buff;
-
- orig_checksum = blhdr->checksum;
- blhdr->checksum = 0;
- if (jnl->flags & JOURNAL_NEED_SWAP) {
- // calculate the checksum based on the unswapped data
- // because it is done byte-at-a-time.
- orig_checksum = (unsigned int)SWAP32(orig_checksum);
- checksum = calc_checksum((char *)blhdr, BLHDR_CHECKSUM_SIZE);
- swap_block_list_header(jnl, blhdr);
- } else {
- checksum = calc_checksum((char *)blhdr, BLHDR_CHECKSUM_SIZE);
- }
-
-
- //
- // XXXdbg - if these checks fail, we should replay as much
- // we can in the hopes that it will still leave the
- // drive in a better state than if we didn't replay
- // anything
- //
- if (checksum != orig_checksum) {
- if (check_past_jnl_end && in_uncharted_territory) {
-
- if (blhdr_offset != jnl->jhdr->end) {
- printf("jnl: %s: Extra txn replay stopped @ %lld / 0x%llx\n", jnl->jdev_name, blhdr_offset, blhdr_offset);
- }
-
- check_past_jnl_end = 0;
- jnl->jhdr->end = blhdr_offset;
- continue;
- }
-
- printf("jnl: %s: replay_journal: bad block list header @ 0x%llx (checksum 0x%x != 0x%x)\n",
- jnl->jdev_name, blhdr_offset, orig_checksum, checksum);
-
- if (blhdr_offset == orig_jnl_start) {
- // if there's nothing in the journal at all, just bail out altogether.
- goto bad_replay;
- }
-
- bad_blocks = 1;
- goto bad_txn_handling;
- }
-
- if ( (last_sequence_num != 0)
- && (blhdr->binfo[0].u.bi.b.sequence_num != 0)
- && (blhdr->binfo[0].u.bi.b.sequence_num != last_sequence_num)
- && (blhdr->binfo[0].u.bi.b.sequence_num != last_sequence_num+1)) {
-
- txn_start_offset = jnl->jhdr->end = blhdr_offset;
-
- if (check_past_jnl_end) {
- check_past_jnl_end = 0;
- printf("jnl: %s: 2: extra replay stopped @ %lld / 0x%llx (seq %d < %d)\n",
- jnl->jdev_name, blhdr_offset, blhdr_offset, blhdr->binfo[0].u.bi.b.sequence_num, last_sequence_num);
- continue;
- }
-
- printf("jnl: %s: txn sequence numbers out of order in txn @ %lld / %llx! (%d < %d)\n",
- jnl->jdev_name, blhdr_offset, blhdr_offset, blhdr->binfo[0].u.bi.b.sequence_num, last_sequence_num);
- bad_blocks = 1;
- goto bad_txn_handling;
- }
- last_sequence_num = blhdr->binfo[0].u.bi.b.sequence_num;
-
- if (blhdr_offset >= jnl->jhdr->end && jnl->jhdr->start <= jnl->jhdr->end) {
- if (last_sequence_num == 0) {
- check_past_jnl_end = 0;
- printf("jnl: %s: pre-sequence-num-enabled txn's - can not go further than end (%lld %lld).\n",
- jnl->jdev_name, jnl->jhdr->start, jnl->jhdr->end);
- if (jnl->jhdr->start != jnl->jhdr->end) {
- jnl->jhdr->start = jnl->jhdr->end;
- }
- continue;
- }
- printf("jnl: %s: examining extra transactions starting @ %lld / 0x%llx\n", jnl->jdev_name, blhdr_offset, blhdr_offset);
- }
-
- if ( blhdr->max_blocks <= 0 || blhdr->max_blocks > (jnl->jhdr->size/jnl->jhdr->jhdr_size)
- || blhdr->num_blocks <= 0 || blhdr->num_blocks > blhdr->max_blocks) {
- printf("jnl: %s: replay_journal: bad looking journal entry: max: %d num: %d\n",
- jnl->jdev_name, blhdr->max_blocks, blhdr->num_blocks);
- bad_blocks = 1;
- goto bad_txn_handling;
- }
-
- max_bsize = 0;
- for (i = 1; i < blhdr->num_blocks; i++) {
- if (blhdr->binfo[i].bnum < 0 && blhdr->binfo[i].bnum != (off_t)-1) {
- printf("jnl: %s: replay_journal: bogus block number 0x%llx\n", jnl->jdev_name, blhdr->binfo[i].bnum);
- bad_blocks = 1;
- goto bad_txn_handling;
- }
-
- if ((size_t)blhdr->binfo[i].u.bi.bsize > max_bsize) {
- max_bsize = blhdr->binfo[i].u.bi.bsize;
- }
- }
-
- if (blhdr->flags & BLHDR_CHECK_CHECKSUMS) {
- check_block_checksums = 1;
- if (kmem_alloc(kernel_map, (vm_offset_t *)&block_ptr, max_bsize, VM_KERN_MEMORY_FILE)) {
- goto bad_replay;
- }
- } else {
- block_ptr = NULL;
- }
-
- if (blhdr->flags & BLHDR_FIRST_HEADER) {
- txn_start_offset = blhdr_offset;
- }
-
- //printf("jnl: replay_journal: adding %d blocks in journal entry @ 0x%llx to co_buf\n",
- // blhdr->num_blocks-1, jnl->jhdr->start);
- bad_blocks = 0;
- for (i = 1; i < blhdr->num_blocks; i++) {
- int size, ret_val;
- off_t number;
-
- size = blhdr->binfo[i].u.bi.bsize;
- number = blhdr->binfo[i].bnum;
-
- // don't add "killed" blocks
- if (number == (off_t)-1) {
- //printf("jnl: replay_journal: skipping killed fs block (index %d)\n", i);
- } else {
-
- if (check_block_checksums) {
- int32_t disk_cksum;
- off_t block_offset;
-
- block_offset = offset;
-
- // read the block so we can check the checksum
- ret = read_journal_data(jnl, &block_offset, block_ptr, size);
- if (ret != (size_t)size) {
- printf("jnl: %s: replay_journal: Could not read journal entry data @ offset 0x%llx!\n", jnl->jdev_name, offset);
- bad_blocks = 1;
- goto bad_txn_handling;
- }
-
- disk_cksum = calc_checksum(block_ptr, size);
-
- // there is no need to swap the checksum from disk because
- // it got swapped when the blhdr was read in.
- if (blhdr->binfo[i].u.bi.b.cksum != 0 && disk_cksum != blhdr->binfo[i].u.bi.b.cksum) {
- printf("jnl: %s: txn starting at %lld (%lld) @ index %3d bnum %lld (%d) with disk cksum != blhdr cksum (0x%.8x 0x%.8x)\n",
- jnl->jdev_name, txn_start_offset, blhdr_offset, i, number, size, disk_cksum, blhdr->binfo[i].u.bi.b.cksum);
- printf("jnl: 0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x 0x%.8x\n",
- *(int *)&block_ptr[0*sizeof(int)], *(int *)&block_ptr[1*sizeof(int)], *(int *)&block_ptr[2*sizeof(int)], *(int *)&block_ptr[3*sizeof(int)],
- *(int *)&block_ptr[4*sizeof(int)], *(int *)&block_ptr[5*sizeof(int)], *(int *)&block_ptr[6*sizeof(int)], *(int *)&block_ptr[7*sizeof(int)]);
-
- bad_blocks = 1;
- goto bad_txn_handling;
- }
- }
-
-
- // add this bucket to co_buf, coalescing where possible
- // printf("jnl: replay_journal: adding block 0x%llx\n", number);
- ret_val = add_block(jnl, &co_buf, number, size, (size_t) offset, blhdr->binfo[i].u.bi.b.cksum, &num_buckets, &num_full);
-
- if (ret_val == -1) {
- printf("jnl: %s: replay_journal: trouble adding block to co_buf\n", jnl->jdev_name);
- goto bad_replay;
- } // else printf("jnl: replay_journal: added block 0x%llx at i=%d\n", number);
- }
-
- // increment offset
- offset += size;
-
- // check if the last block added puts us off the end of the jnl.
- // if so, we need to wrap to the beginning and take any remainder
- // into account
- //
- if (offset >= jnl->jhdr->size) {
- offset = jnl->jhdr->jhdr_size + (offset - jnl->jhdr->size);
- }
- }
-
- if (block_ptr) {
- kmem_free(kernel_map, (vm_offset_t)block_ptr, max_bsize);
- block_ptr = NULL;
- }
-
-bad_txn_handling:
- if (bad_blocks) {
- /* Journal replay got error before it found any valid
- * transations, abort replay */
- if (txn_start_offset == 0) {
- printf("jnl: %s: no known good txn start offset! aborting journal replay.\n", jnl->jdev_name);
- goto bad_replay;
- }
-
- /* Repeated error during journal replay, abort replay */
- if (replay_retry_count == 3) {
- printf("jnl: %s: repeated errors replaying journal! aborting journal replay.\n", jnl->jdev_name);
- goto bad_replay;
- }
- replay_retry_count++;
-
- /* There was an error replaying the journal (possibly
- * EIO/ENXIO from the device). So retry replaying all
- * the good transactions that we found before getting
- * the error.
- */
- jnl->jhdr->start = orig_jnl_start;
- jnl->jhdr->end = txn_start_offset;
- check_past_jnl_end = 0;
- last_sequence_num = 0;
- printf("jnl: %s: restarting journal replay (%lld - %lld)!\n", jnl->jdev_name, jnl->jhdr->start, jnl->jhdr->end);
- goto restart_replay;
- }
-
- jnl->jhdr->start += blhdr->bytes_used;
- if (jnl->jhdr->start >= jnl->jhdr->size) {
- // wrap around and skip the journal header block
- jnl->jhdr->start = (jnl->jhdr->start % jnl->jhdr->size) + jnl->jhdr->jhdr_size;
- }
-
- if (jnl->jhdr->start == jnl->jhdr->end) {
- in_uncharted_territory = 1;
- }
- }
-
- if (jnl->jhdr->start != jnl->jhdr->end) {
- printf("jnl: %s: start %lld != end %lld. resetting end.\n", jnl->jdev_name, jnl->jhdr->start, jnl->jhdr->end);
- jnl->jhdr->end = jnl->jhdr->start;
- }
-
- //printf("jnl: replay_journal: replaying %d blocks\n", num_full);
-
- /*
- * make sure it's at least one page in size, so
- * start max_bsize at PAGE_SIZE
- */
- for (i = 0, max_bsize = PAGE_SIZE; i < num_full; i++) {
-
- if (co_buf[i].block_num == (off_t)-1)
- continue;
-
- if (co_buf[i].block_size > max_bsize)
- max_bsize = co_buf[i].block_size;
- }
- /*
- * round max_bsize up to the nearest PAGE_SIZE multiple
- */
- if (max_bsize & (PAGE_SIZE - 1)) {
- max_bsize = (max_bsize + PAGE_SIZE) & ~(PAGE_SIZE - 1);
- }
-
- if (kmem_alloc(kernel_map, (vm_offset_t *)&block_ptr, max_bsize, VM_KERN_MEMORY_FILE)) {
- goto bad_replay;
- }
-
- // Replay the coalesced entries in the co-buf
- for(i = 0; i < num_full; i++) {
- size_t size = co_buf[i].block_size;
- off_t jnl_offset = (off_t) co_buf[i].jnl_offset;
- off_t number = co_buf[i].block_num;
-
-
- // printf("replaying co_buf[%d]: block 0x%llx, size 0x%x, jnl_offset 0x%llx\n", i, co_buf[i].block_num,
- // co_buf[i].block_size, co_buf[i].jnl_offset);
-
- if (number == (off_t)-1) {
- // printf("jnl: replay_journal: skipping killed fs block\n");
- } else {
-
- // do journal read, and set the phys. block
- ret = read_journal_data(jnl, &jnl_offset, block_ptr, size);
- if (ret != size) {
- printf("jnl: %s: replay_journal: Could not read journal entry data @ offset 0x%llx!\n", jnl->jdev_name, offset);
- goto bad_replay;
- }
-
- if (update_fs_block(jnl, block_ptr, number, size) != 0) {
- goto bad_replay;
- }
- }
- }
-
-
- // done replaying; update jnl header
- if (write_journal_header(jnl, 1, jnl->jhdr->sequence_num) != 0) {
- goto bad_replay;
- }
-
- printf("jnl: %s: journal replay done.\n", jnl->jdev_name);
-
- // free block_ptr
- if (block_ptr) {
- kmem_free(kernel_map, (vm_offset_t)block_ptr, max_bsize);
- block_ptr = NULL;
- }
-
- // free the coalesce buffer
- FREE(co_buf, M_TEMP);
- co_buf = NULL;
-
- kmem_free(kernel_map, (vm_offset_t)buff, jnl->jhdr->blhdr_size);
- return 0;
-
-bad_replay:
- if (block_ptr) {
- kmem_free(kernel_map, (vm_offset_t)block_ptr, max_bsize);
- }
- if (co_buf) {
- FREE(co_buf, M_TEMP);
- }
- kmem_free(kernel_map, (vm_offset_t)buff, jnl->jhdr->blhdr_size);
-
- return -1;
-}
-
-
-#define DEFAULT_TRANSACTION_BUFFER_SIZE (128*1024)
-#define MAX_TRANSACTION_BUFFER_SIZE (3072*1024)
-
-// XXXdbg - so I can change it in the debugger
-int def_tbuffer_size = 0;
-
-
-//
-// This function sets the size of the tbuffer and the
-// size of the blhdr. It assumes that jnl->jhdr->size
-// and jnl->jhdr->jhdr_size are already valid.
-//
-static void
-size_up_tbuffer(journal *jnl, int tbuffer_size, int phys_blksz)
-{
- //
- // one-time initialization based on how much memory
- // there is in the machine.
- //
- if (def_tbuffer_size == 0) {
- if (max_mem < (256*1024*1024)) {
- def_tbuffer_size = DEFAULT_TRANSACTION_BUFFER_SIZE;
- } else if (max_mem < (512*1024*1024)) {
- def_tbuffer_size = DEFAULT_TRANSACTION_BUFFER_SIZE * 2;
- } else if (max_mem < (1024*1024*1024)) {
- def_tbuffer_size = DEFAULT_TRANSACTION_BUFFER_SIZE * 3;
- } else {
- def_tbuffer_size = DEFAULT_TRANSACTION_BUFFER_SIZE * (max_mem / (256*1024*1024));
- }
- }
-
- // size up the transaction buffer... can't be larger than the number
- // of blocks that can fit in a block_list_header block.
- if (tbuffer_size == 0) {
- jnl->tbuffer_size = def_tbuffer_size;
- } else {
- // make sure that the specified tbuffer_size isn't too small
- if (tbuffer_size < jnl->jhdr->blhdr_size * 2) {
- tbuffer_size = jnl->jhdr->blhdr_size * 2;
- }
- // and make sure it's an even multiple of the block size
- if ((tbuffer_size % jnl->jhdr->jhdr_size) != 0) {
- tbuffer_size -= (tbuffer_size % jnl->jhdr->jhdr_size);
- }
-
- jnl->tbuffer_size = tbuffer_size;
- }
-
- if (jnl->tbuffer_size > (jnl->jhdr->size / 2)) {
- jnl->tbuffer_size = (jnl->jhdr->size / 2);
- }
-
- if (jnl->tbuffer_size > MAX_TRANSACTION_BUFFER_SIZE) {
- jnl->tbuffer_size = MAX_TRANSACTION_BUFFER_SIZE;
- }
-
- jnl->jhdr->blhdr_size = (jnl->tbuffer_size / jnl->jhdr->jhdr_size) * sizeof(block_info);
- if (jnl->jhdr->blhdr_size < phys_blksz) {
- jnl->jhdr->blhdr_size = phys_blksz;
- } else if ((jnl->jhdr->blhdr_size % phys_blksz) != 0) {
- // have to round up so we're an even multiple of the physical block size
- jnl->jhdr->blhdr_size = (jnl->jhdr->blhdr_size + (phys_blksz - 1)) & ~(phys_blksz - 1);
- }
-}
-
-static void
-get_io_info(struct vnode *devvp, size_t phys_blksz, journal *jnl, struct vfs_context *context)
-{
- off_t readblockcnt;
- off_t writeblockcnt;
- off_t readmaxcnt=0, tmp_readmaxcnt;
- off_t writemaxcnt=0, tmp_writemaxcnt;
- off_t readsegcnt, writesegcnt;
- int32_t features;
-
- if (VNOP_IOCTL(devvp, DKIOCGETFEATURES, (caddr_t)&features, 0, context) == 0) {
- if (features & DK_FEATURE_FORCE_UNIT_ACCESS) {
- const char *name = vnode_getname_printable(devvp);
- jnl->flags |= JOURNAL_DO_FUA_WRITES;
- printf("jnl: %s: enabling FUA writes (features 0x%x)\n", name, features);
- vnode_putname_printable(name);
- }
- if (features & DK_FEATURE_UNMAP) {
- jnl->flags |= JOURNAL_USE_UNMAP;
- }
-
- if (features & DK_FEATURE_BARRIER) {
- jnl->flags |= JOURNAL_FEATURE_BARRIER;
- }
- }
-
- //
- // First check the max read size via several different mechanisms...
- //
- VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTREAD, (caddr_t)&readmaxcnt, 0, context);
-
- if (VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTREAD, (caddr_t)&readblockcnt, 0, context) == 0) {
- tmp_readmaxcnt = readblockcnt * phys_blksz;
- if (readmaxcnt == 0 || (readblockcnt > 0 && tmp_readmaxcnt < readmaxcnt)) {
- readmaxcnt = tmp_readmaxcnt;
- }
- }
-
- if (VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTREAD, (caddr_t)&readsegcnt, 0, context)) {
- readsegcnt = 0;
- }
-
- if (readsegcnt > 0 && (readsegcnt * PAGE_SIZE) < readmaxcnt) {
- readmaxcnt = readsegcnt * PAGE_SIZE;
- }
-
- if (readmaxcnt == 0) {
- readmaxcnt = 128 * 1024;
- } else if (readmaxcnt > UINT32_MAX) {
- readmaxcnt = UINT32_MAX;
- }
-
-
- //
- // Now check the max writes size via several different mechanisms...
- //
- VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTWRITE, (caddr_t)&writemaxcnt, 0, context);
-
- if (VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTWRITE, (caddr_t)&writeblockcnt, 0, context) == 0) {
- tmp_writemaxcnt = writeblockcnt * phys_blksz;
- if (writemaxcnt == 0 || (writeblockcnt > 0 && tmp_writemaxcnt < writemaxcnt)) {
- writemaxcnt = tmp_writemaxcnt;
- }
- }
-
- if (VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTWRITE, (caddr_t)&writesegcnt, 0, context)) {
- writesegcnt = 0;
- }
-
- if (writesegcnt > 0 && (writesegcnt * PAGE_SIZE) < writemaxcnt) {
- writemaxcnt = writesegcnt * PAGE_SIZE;
- }
-
- if (writemaxcnt == 0) {
- writemaxcnt = 128 * 1024;
- } else if (writemaxcnt > UINT32_MAX) {
- writemaxcnt = UINT32_MAX;
- }
-
- jnl->max_read_size = readmaxcnt;
- jnl->max_write_size = writemaxcnt;
- // printf("jnl: %s: max read/write: %lld k / %lld k\n",
- // jnl->jdev_name ? jnl->jdev_name : "unknown",
- // jnl->max_read_size/1024, jnl->max_write_size/1024);
-}
-
-
-journal *
-journal_create(struct vnode *jvp,
- off_t offset,
- off_t journal_size,
- struct vnode *fsvp,
- size_t min_fs_blksz,
- int32_t flags,
- int32_t tbuffer_size,
- void (*flush)(void *arg),
- void *arg,
- struct mount *fsmount)
-{
- journal *jnl;
- uint32_t phys_blksz, new_txn_base;
- u_int32_t min_size;
- struct vfs_context context;
- const char *jdev_name;
- /*
- * Cap the journal max size to 2GB. On HFS, it will attempt to occupy
- * a full allocation block if the current size is smaller than the allocation
- * block on which it resides. Once we hit the exabyte filesystem range, then
- * it will use 2GB allocation blocks. As a result, make the cap 2GB.
- */
- context.vc_thread = current_thread();
- context.vc_ucred = FSCRED;
-
- jdev_name = vnode_getname_printable(jvp);
-
- /* Get the real physical block size. */
- if (VNOP_IOCTL(jvp, DKIOCGETBLOCKSIZE, (caddr_t)&phys_blksz, 0, &context)) {
- goto cleanup_jdev_name;
- }
-
- if (journal_size < (256*1024) || journal_size > (MAX_JOURNAL_SIZE)) {
- printf("jnl: %s: create: journal size %lld looks bogus.\n", jdev_name, journal_size);
- goto cleanup_jdev_name;
- }
-
- min_size = phys_blksz * (phys_blksz / sizeof(block_info));
- /* Reject journals that are too small given the sector size of the device */
- if (journal_size < min_size) {
- printf("jnl: %s: create: journal size (%lld) too small given sector size of (%u)\n",
- jdev_name, journal_size, phys_blksz);
- goto cleanup_jdev_name;
- }
-
- if (phys_blksz > min_fs_blksz) {
- printf("jnl: %s: create: error: phys blksize %u bigger than min fs blksize %zd\n",
- jdev_name, phys_blksz, min_fs_blksz);
- goto cleanup_jdev_name;
- }
-
- if ((journal_size % phys_blksz) != 0) {
- printf("jnl: %s: create: journal size 0x%llx is not an even multiple of block size 0x%ux\n",
- jdev_name, journal_size, phys_blksz);
- goto cleanup_jdev_name;
- }
-
-
- MALLOC_ZONE(jnl, struct journal *, sizeof(struct journal), M_JNL_JNL, M_WAITOK);
- memset(jnl, 0, sizeof(*jnl));
-
- jnl->jdev = jvp;
- jnl->jdev_offset = offset;
- jnl->fsdev = fsvp;
- jnl->flush = flush;
- jnl->flush_arg = arg;
- jnl->flags = (flags & JOURNAL_OPTION_FLAGS_MASK);
- jnl->jdev_name = jdev_name;
- lck_mtx_init(&jnl->old_start_lock, jnl_mutex_group, jnl_lock_attr);
-
- // Keep a point to the mount around for use in IO throttling.
- jnl->fsmount = fsmount;
- // XXX: This lock discipline looks correct based on dounmount(), but it
- // doesn't seem to be documented anywhere.
- mount_ref(fsmount, 0);
-
- get_io_info(jvp, phys_blksz, jnl, &context);
-
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&jnl->header_buf, phys_blksz, VM_KERN_MEMORY_FILE)) {
- printf("jnl: %s: create: could not allocate space for header buffer (%u bytes)\n", jdev_name, phys_blksz);
- goto bad_kmem_alloc;
- }
- jnl->header_buf_size = phys_blksz;
-
- jnl->jhdr = (journal_header *)jnl->header_buf;
- memset(jnl->jhdr, 0, sizeof(journal_header));
-
- // we have to set this up here so that do_journal_io() will work
- jnl->jhdr->jhdr_size = phys_blksz;
-
- //
- // We try and read the journal header to see if there is already one
- // out there. If there is, it's possible that it has transactions
- // in it that we might replay if we happen to pick a sequence number
- // that is a little less than the old one, there is a crash and the
- // last txn written ends right at the start of a txn from the previous
- // incarnation of this file system. If all that happens we would
- // replay the transactions from the old file system and that would
- // destroy your disk. Although it is extremely unlikely for all those
- // conditions to happen, the probability is non-zero and the result is
- // severe - you lose your file system. Therefore if we find a valid
- // journal header and the sequence number is non-zero we write junk
- // over the entire journal so that there is no way we will encounter
- // any old transactions. This is slow but should be a rare event
- // since most tools erase the journal.
- //
- if ( read_journal_header(jnl, jnl->jhdr, phys_blksz) == phys_blksz
- && jnl->jhdr->magic == JOURNAL_HEADER_MAGIC
- && jnl->jhdr->sequence_num != 0) {
-
- new_txn_base = (jnl->jhdr->sequence_num + (journal_size / phys_blksz) + (random() % 16384)) & 0x00ffffff;
- printf("jnl: %s: create: avoiding old sequence number 0x%x (0x%x)\n", jdev_name, jnl->jhdr->sequence_num, new_txn_base);
-
-#if 0
- int i;
- off_t pos=0;
-
- for(i = 1; i < journal_size / phys_blksz; i++) {
- pos = i*phys_blksz;
-
- // we don't really care what data we write just so long
- // as it's not a valid transaction header. since we have
- // the header_buf sitting around we'll use that.
- write_journal_data(jnl, &pos, jnl->header_buf, phys_blksz);
- }
- printf("jnl: create: done clearing journal (i=%d)\n", i);
-#endif
- } else {
- new_txn_base = random() & 0x00ffffff;
- }
-
- memset(jnl->header_buf, 0, phys_blksz);
-
- jnl->jhdr->magic = JOURNAL_HEADER_MAGIC;
- jnl->jhdr->endian = ENDIAN_MAGIC;
- jnl->jhdr->start = phys_blksz; // start at block #1, block #0 is for the jhdr itself
- jnl->jhdr->end = phys_blksz;
- jnl->jhdr->size = journal_size;
- jnl->jhdr->jhdr_size = phys_blksz;
- size_up_tbuffer(jnl, tbuffer_size, phys_blksz);
-
- jnl->active_start = jnl->jhdr->start;
-
- // XXXdbg - for testing you can force the journal to wrap around
- // jnl->jhdr->start = jnl->jhdr->size - (phys_blksz*3);
- // jnl->jhdr->end = jnl->jhdr->size - (phys_blksz*3);
-
- jnl->jhdr->sequence_num = new_txn_base;
-
- lck_mtx_init(&jnl->jlock, jnl_mutex_group, jnl_lock_attr);
- lck_mtx_init(&jnl->flock, jnl_mutex_group, jnl_lock_attr);
- lck_rw_init(&jnl->trim_lock, jnl_mutex_group, jnl_lock_attr);
-
-
- jnl->flushing = FALSE;
- jnl->asyncIO = FALSE;
- jnl->flush_aborted = FALSE;
- jnl->writing_header = FALSE;
- jnl->async_trim = NULL;
- jnl->sequence_num = jnl->jhdr->sequence_num;
-
- if (write_journal_header(jnl, 1, jnl->jhdr->sequence_num) != 0) {
- printf("jnl: %s: journal_create: failed to write journal header.\n", jdev_name);
- goto bad_write;
- }
-
- goto journal_create_complete;
-
-
-bad_write:
- kmem_free(kernel_map, (vm_offset_t)jnl->header_buf, phys_blksz);
-bad_kmem_alloc:
- jnl->jhdr = NULL;
- FREE_ZONE(jnl, sizeof(struct journal), M_JNL_JNL);
- mount_drop(fsmount, 0);
-cleanup_jdev_name:
- vnode_putname_printable(jdev_name);
- jnl = NULL;
-journal_create_complete:
- return jnl;
-}
-
-
-journal *
-journal_open(struct vnode *jvp,
- off_t offset,
- off_t journal_size,
- struct vnode *fsvp,
- size_t min_fs_blksz,
- int32_t flags,
- int32_t tbuffer_size,
- void (*flush)(void *arg),
- void *arg,
- struct mount *fsmount)
-{
- journal *jnl;
- uint32_t orig_blksz=0;
- uint32_t phys_blksz;
- u_int32_t min_size = 0;
- int orig_checksum, checksum;
- struct vfs_context context;
- const char *jdev_name = vnode_getname_printable(jvp);
-
- context.vc_thread = current_thread();
- context.vc_ucred = FSCRED;
-
- /* Get the real physical block size. */
- if (VNOP_IOCTL(jvp, DKIOCGETBLOCKSIZE, (caddr_t)&phys_blksz, 0, &context)) {
- goto cleanup_jdev_name;
- }
-
- if (phys_blksz > min_fs_blksz) {
- printf("jnl: %s: open: error: phys blksize %u bigger than min fs blksize %zd\n",
- jdev_name, phys_blksz, min_fs_blksz);
- goto cleanup_jdev_name;
- }
-
- if (journal_size < (256*1024) || journal_size > (1024*1024*1024)) {
- printf("jnl: %s: open: journal size %lld looks bogus.\n", jdev_name, journal_size);
- goto cleanup_jdev_name;
- }
-
- min_size = phys_blksz * (phys_blksz / sizeof(block_info));
- /* Reject journals that are too small given the sector size of the device */
- if (journal_size < min_size) {
- printf("jnl: %s: open: journal size (%lld) too small given sector size of (%u)\n",
- jdev_name, journal_size, phys_blksz);
- goto cleanup_jdev_name;
- }
-
- if ((journal_size % phys_blksz) != 0) {
- printf("jnl: %s: open: journal size 0x%llx is not an even multiple of block size 0x%x\n",
- jdev_name, journal_size, phys_blksz);
- goto cleanup_jdev_name;
- }
-
- MALLOC_ZONE(jnl, struct journal *, sizeof(struct journal), M_JNL_JNL, M_WAITOK);
- memset(jnl, 0, sizeof(*jnl));
-
- jnl->jdev = jvp;
- jnl->jdev_offset = offset;
- jnl->fsdev = fsvp;
- jnl->flush = flush;
- jnl->flush_arg = arg;
- jnl->flags = (flags & JOURNAL_OPTION_FLAGS_MASK);
- jnl->jdev_name = jdev_name;
- lck_mtx_init(&jnl->old_start_lock, jnl_mutex_group, jnl_lock_attr);
-
- /* We need a reference to the mount to later pass to the throttling code for
- * IO accounting.
- */
- jnl->fsmount = fsmount;
- mount_ref(fsmount, 0);
-
- get_io_info(jvp, phys_blksz, jnl, &context);
-
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&jnl->header_buf, phys_blksz, VM_KERN_MEMORY_FILE)) {
- printf("jnl: %s: create: could not allocate space for header buffer (%u bytes)\n", jdev_name, phys_blksz);
- goto bad_kmem_alloc;
- }
- jnl->header_buf_size = phys_blksz;
-
- jnl->jhdr = (journal_header *)jnl->header_buf;
- memset(jnl->jhdr, 0, sizeof(journal_header));
-
- // we have to set this up here so that do_journal_io() will work
- jnl->jhdr->jhdr_size = phys_blksz;
-
- if (read_journal_header(jnl, jnl->jhdr, phys_blksz) != phys_blksz) {
- printf("jnl: %s: open: could not read %u bytes for the journal header.\n",
- jdev_name, phys_blksz);
- goto bad_journal;
- }
-
- orig_checksum = jnl->jhdr->checksum;
- jnl->jhdr->checksum = 0;
-
- if (jnl->jhdr->magic == SWAP32(JOURNAL_HEADER_MAGIC)) {
- // do this before the swap since it's done byte-at-a-time
- orig_checksum = SWAP32(orig_checksum);
- checksum = calc_checksum((char *)jnl->jhdr, JOURNAL_HEADER_CKSUM_SIZE);
- swap_journal_header(jnl);
- jnl->flags |= JOURNAL_NEED_SWAP;
- } else {
- checksum = calc_checksum((char *)jnl->jhdr, JOURNAL_HEADER_CKSUM_SIZE);
- }
-
- if (jnl->jhdr->magic != JOURNAL_HEADER_MAGIC && jnl->jhdr->magic != OLD_JOURNAL_HEADER_MAGIC) {
- printf("jnl: %s: open: journal magic is bad (0x%x != 0x%x)\n",
- jnl->jdev_name, jnl->jhdr->magic, JOURNAL_HEADER_MAGIC);
- goto bad_journal;
- }
-
- // only check if we're the current journal header magic value
- if (jnl->jhdr->magic == JOURNAL_HEADER_MAGIC) {
-
- if (orig_checksum != checksum) {
- printf("jnl: %s: open: journal checksum is bad (0x%x != 0x%x)\n",
- jdev_name, orig_checksum, checksum);
-
- //goto bad_journal;
- }
- }
-
- // XXXdbg - convert old style magic numbers to the new one
- if (jnl->jhdr->magic == OLD_JOURNAL_HEADER_MAGIC) {
- jnl->jhdr->magic = JOURNAL_HEADER_MAGIC;
- }
-
- if (phys_blksz != (size_t)jnl->jhdr->jhdr_size && jnl->jhdr->jhdr_size != 0) {
- /*
- * The volume has probably been resized (such that we had to adjust the
- * logical sector size), or copied to media with a different logical
- * sector size.
- *
- * Temporarily change the device's logical block size to match the
- * journal's header size. This will allow us to replay the journal
- * safely. If the replay succeeds, we will update the journal's header
- * size (later in this function).
- */
- orig_blksz = phys_blksz;
- phys_blksz = jnl->jhdr->jhdr_size;
- VNOP_IOCTL(jvp, DKIOCSETBLOCKSIZE, (caddr_t)&phys_blksz, FWRITE, &context);
- printf("jnl: %s: open: temporarily switched block size from %u to %u\n",
- jdev_name, orig_blksz, phys_blksz);
- }
-
- if ( jnl->jhdr->start <= 0
- || jnl->jhdr->start > jnl->jhdr->size
- || jnl->jhdr->start > 1024*1024*1024) {
- printf("jnl: %s: open: jhdr start looks bad (0x%llx max size 0x%llx)\n",
- jdev_name, jnl->jhdr->start, jnl->jhdr->size);
- goto bad_journal;
- }
-
- if ( jnl->jhdr->end <= 0
- || jnl->jhdr->end > jnl->jhdr->size
- || jnl->jhdr->end > 1024*1024*1024) {
- printf("jnl: %s: open: jhdr end looks bad (0x%llx max size 0x%llx)\n",
- jdev_name, jnl->jhdr->end, jnl->jhdr->size);
- goto bad_journal;
- }
-
- if (jnl->jhdr->size < (256*1024) || jnl->jhdr->size > 1024*1024*1024) {
- printf("jnl: %s: open: jhdr size looks bad (0x%llx)\n", jdev_name, jnl->jhdr->size);
- goto bad_journal;
- }
-
-// XXXdbg - can't do these checks because hfs writes all kinds of
-// non-uniform sized blocks even on devices that have a block size
-// that is larger than 512 bytes (i.e. optical media w/2k blocks).
-// therefore these checks will fail and so we just have to punt and
-// do more relaxed checking...
-// XXXdbg if ((jnl->jhdr->start % jnl->jhdr->jhdr_size) != 0) {
- if ((jnl->jhdr->start % 512) != 0) {
- printf("jnl: %s: open: journal start (0x%llx) not a multiple of 512?\n",
- jdev_name, jnl->jhdr->start);
- goto bad_journal;
- }
-
-//XXXdbg if ((jnl->jhdr->end % jnl->jhdr->jhdr_size) != 0) {
- if ((jnl->jhdr->end % 512) != 0) {
- printf("jnl: %s: open: journal end (0x%llx) not a multiple of block size (0x%x)?\n",
- jdev_name, jnl->jhdr->end, jnl->jhdr->jhdr_size);
- goto bad_journal;
- }
-
- // take care of replaying the journal if necessary
- if (flags & JOURNAL_RESET) {
- printf("jnl: %s: journal start/end pointers reset! (s 0x%llx e 0x%llx)\n",
- jdev_name, jnl->jhdr->start, jnl->jhdr->end);
- jnl->jhdr->start = jnl->jhdr->end;
- } else if (replay_journal(jnl) != 0) {
- printf("jnl: %s: journal_open: Error replaying the journal!\n", jdev_name);
- goto bad_journal;
- }
-
- /*
- * When we get here, we know that the journal is empty (jnl->jhdr->start ==
- * jnl->jhdr->end). If the device's logical block size was different from
- * the journal's header size, then we can now restore the device's logical
- * block size and update the journal's header size to match.
- *
- * Note that we also adjust the journal's start and end so that they will
- * be aligned on the new block size. We pick a new sequence number to
- * avoid any problems if a replay found previous transactions using the old
- * journal header size. (See the comments in journal_create(), above.)
- */
-
- if (orig_blksz != 0) {
- VNOP_IOCTL(jvp, DKIOCSETBLOCKSIZE, (caddr_t)&orig_blksz, FWRITE, &context);
- phys_blksz = orig_blksz;
-
- orig_blksz = 0;
-
- jnl->jhdr->jhdr_size = phys_blksz;
- jnl->jhdr->start = phys_blksz;
- jnl->jhdr->end = phys_blksz;
- jnl->jhdr->sequence_num = (jnl->jhdr->sequence_num +
- (journal_size / phys_blksz) +
- (random() % 16384)) & 0x00ffffff;
-
- if (write_journal_header(jnl, 1, jnl->jhdr->sequence_num)) {
- printf("jnl: %s: open: failed to update journal header size\n", jdev_name);
- goto bad_journal;
- }
- }
-
- // make sure this is in sync!
- jnl->active_start = jnl->jhdr->start;
- jnl->sequence_num = jnl->jhdr->sequence_num;
-
- // set this now, after we've replayed the journal
- size_up_tbuffer(jnl, tbuffer_size, phys_blksz);
-
- // TODO: Does this need to change if the device's logical block size changed?
- if ((off_t)(jnl->jhdr->blhdr_size/sizeof(block_info)-1) > (jnl->jhdr->size/jnl->jhdr->jhdr_size)) {
- printf("jnl: %s: open: jhdr size and blhdr size are not compatible (0x%llx, %d, %d)\n", jdev_name, jnl->jhdr->size,
- jnl->jhdr->blhdr_size, jnl->jhdr->jhdr_size);
- goto bad_journal;
- }
-
- lck_mtx_init(&jnl->jlock, jnl_mutex_group, jnl_lock_attr);
- lck_mtx_init(&jnl->flock, jnl_mutex_group, jnl_lock_attr);
- lck_rw_init(&jnl->trim_lock, jnl_mutex_group, jnl_lock_attr);
-
- goto journal_open_complete;
-
-bad_journal:
- if (orig_blksz != 0) {
- phys_blksz = orig_blksz;
- VNOP_IOCTL(jvp, DKIOCSETBLOCKSIZE, (caddr_t)&orig_blksz, FWRITE, &context);
- printf("jnl: %s: open: restored block size after error\n", jdev_name);
- }
- kmem_free(kernel_map, (vm_offset_t)jnl->header_buf, phys_blksz);
-bad_kmem_alloc:
- FREE_ZONE(jnl, sizeof(struct journal), M_JNL_JNL);
- mount_drop(fsmount, 0);
-cleanup_jdev_name:
- vnode_putname_printable(jdev_name);
- jnl = NULL;
-journal_open_complete:
- return jnl;
-}
-
-
-int
-journal_is_clean(struct vnode *jvp,
- off_t offset,
- off_t journal_size,
- struct vnode *fsvp,
- size_t min_fs_block_size)
-{
- journal jnl;
- uint32_t phys_blksz;
- int ret;
- int orig_checksum, checksum;
- struct vfs_context context;
- const char *jdev_name = vnode_getname_printable(jvp);
-
- context.vc_thread = current_thread();
- context.vc_ucred = FSCRED;
-
- /* Get the real physical block size. */
- if (VNOP_IOCTL(jvp, DKIOCGETBLOCKSIZE, (caddr_t)&phys_blksz, 0, &context)) {
- printf("jnl: %s: is_clean: failed to get device block size.\n", jdev_name);
- ret = EINVAL;
- goto cleanup_jdev_name;
- }
-
- if (phys_blksz > (uint32_t)min_fs_block_size) {
- printf("jnl: %s: is_clean: error: phys blksize %d bigger than min fs blksize %zd\n",
- jdev_name, phys_blksz, min_fs_block_size);
- ret = EINVAL;
- goto cleanup_jdev_name;
- }
-
- if (journal_size < (256*1024) || journal_size > (MAX_JOURNAL_SIZE)) {
- printf("jnl: %s: is_clean: journal size %lld looks bogus.\n", jdev_name, journal_size);
- ret = EINVAL;
- goto cleanup_jdev_name;
- }
-
- if ((journal_size % phys_blksz) != 0) {
- printf("jnl: %s: is_clean: journal size 0x%llx is not an even multiple of block size 0x%x\n",
- jdev_name, journal_size, phys_blksz);
- ret = EINVAL;
- goto cleanup_jdev_name;
- }
-
- memset(&jnl, 0, sizeof(jnl));
-
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&jnl.header_buf, phys_blksz, VM_KERN_MEMORY_FILE)) {
- printf("jnl: %s: is_clean: could not allocate space for header buffer (%d bytes)\n", jdev_name, phys_blksz);
- ret = ENOMEM;
- goto cleanup_jdev_name;
- }
- jnl.header_buf_size = phys_blksz;
-
- get_io_info(jvp, phys_blksz, &jnl, &context);
-
- jnl.jhdr = (journal_header *)jnl.header_buf;
- memset(jnl.jhdr, 0, sizeof(journal_header));
-
- jnl.jdev = jvp;
- jnl.jdev_offset = offset;
- jnl.fsdev = fsvp;
-
- // we have to set this up here so that do_journal_io() will work
- jnl.jhdr->jhdr_size = phys_blksz;
-
- if (read_journal_header(&jnl, jnl.jhdr, phys_blksz) != (unsigned)phys_blksz) {
- printf("jnl: %s: is_clean: could not read %d bytes for the journal header.\n",
- jdev_name, phys_blksz);
- ret = EINVAL;
- goto get_out;
- }
-
- orig_checksum = jnl.jhdr->checksum;
- jnl.jhdr->checksum = 0;
-
- if (jnl.jhdr->magic == SWAP32(JOURNAL_HEADER_MAGIC)) {
- // do this before the swap since it's done byte-at-a-time
- orig_checksum = SWAP32(orig_checksum);
- checksum = calc_checksum((char *)jnl.jhdr, JOURNAL_HEADER_CKSUM_SIZE);
- swap_journal_header(&jnl);
- jnl.flags |= JOURNAL_NEED_SWAP;
- } else {
- checksum = calc_checksum((char *)jnl.jhdr, JOURNAL_HEADER_CKSUM_SIZE);
- }
-
- if (jnl.jhdr->magic != JOURNAL_HEADER_MAGIC && jnl.jhdr->magic != OLD_JOURNAL_HEADER_MAGIC) {
- printf("jnl: %s: is_clean: journal magic is bad (0x%x != 0x%x)\n",
- jdev_name, jnl.jhdr->magic, JOURNAL_HEADER_MAGIC);
- ret = EINVAL;
- goto get_out;
- }
-
- if (orig_checksum != checksum) {
- printf("jnl: %s: is_clean: journal checksum is bad (0x%x != 0x%x)\n", jdev_name, orig_checksum, checksum);
- ret = EINVAL;
- goto get_out;
- }
-
- //
- // if the start and end are equal then the journal is clean.
- // otherwise it's not clean and therefore an error.
- //
- if (jnl.jhdr->start == jnl.jhdr->end) {
- ret = 0;
- } else {
- ret = EBUSY; // so the caller can differentiate an invalid journal from a "busy" one
- }
-
-get_out:
- kmem_free(kernel_map, (vm_offset_t)jnl.header_buf, phys_blksz);
-cleanup_jdev_name:
- vnode_putname_printable(jdev_name);
- return ret;
-}
-
-
-void
-journal_close(journal *jnl)
-{
- volatile off_t *start, *end;
- int counter=0;
-
- CHECK_JOURNAL(jnl);
-
- // set this before doing anything that would block so that
- // we start tearing things down properly.
- //
- jnl->flags |= JOURNAL_CLOSE_PENDING;
-
- if (jnl->owner != current_thread()) {
- journal_lock(jnl);
- }
-
- wait_condition(jnl, &jnl->flushing, "journal_close");
-
- //
- // only write stuff to disk if the journal is still valid
- //
- if ((jnl->flags & JOURNAL_INVALID) == 0) {
-
- if (jnl->active_tr) {
- /*
- * "journal_end_transaction" will fire the flush asynchronously
- */
- journal_end_transaction(jnl);
- }
-
- // flush any buffered transactions
- if (jnl->cur_tr) {
- transaction *tr = jnl->cur_tr;
-
- jnl->cur_tr = NULL;
- /*
- * "end_transaction" will wait for any in-progress flush to complete
- * before flushing "cur_tr" synchronously("must_wait" == TRUE)
- */
- end_transaction(tr, 1, NULL, NULL, FALSE, TRUE);
- }
- /*
- * if there was an "active_tr", make sure we wait for
- * it to flush if there was no "cur_tr" to process
- */
- wait_condition(jnl, &jnl->flushing, "journal_close");
-
- //start = &jnl->jhdr->start;
- start = &jnl->active_start;
- end = &jnl->jhdr->end;
-
- while (*start != *end && counter++ < 5000) {
- //printf("jnl: close: flushing the buffer cache (start 0x%llx end 0x%llx)\n", *start, *end);
- if (jnl->flush) {
- jnl->flush(jnl->flush_arg);
- }
- tsleep((caddr_t)jnl, PRIBIO, "jnl_close", 2);
- }
-
- if (*start != *end) {
- printf("jnl: %s: close: buffer flushing didn't seem to flush out all the transactions! (0x%llx - 0x%llx)\n",
- jnl->jdev_name, *start, *end);
- }
-
- // make sure this is in sync when we close the journal
- jnl->jhdr->start = jnl->active_start;
-
- // if this fails there's not much we can do at this point...
- write_journal_header(jnl, 1, jnl->sequence_num);
- } else {
- // if we're here the journal isn't valid any more.
- // so make sure we don't leave any locked blocks lying around
- printf("jnl: %s: close: journal is invalid. aborting outstanding transactions\n", jnl->jdev_name);
- if (jnl->active_tr || jnl->cur_tr) {
- transaction *tr;
-
- if (jnl->active_tr) {
- tr = jnl->active_tr;
- jnl->active_tr = NULL;
- } else {
- tr = jnl->cur_tr;
- jnl->cur_tr = NULL;
- }
- abort_transaction(jnl, tr);
-
- if (jnl->active_tr || jnl->cur_tr) {
- panic("jnl: %s: close: jnl @ %p had both an active and cur tr\n", jnl->jdev_name, jnl);
- }
- }
- }
- wait_condition(jnl, &jnl->asyncIO, "journal_close");
-
- free_old_stuff(jnl);
-
- kmem_free(kernel_map, (vm_offset_t)jnl->header_buf, jnl->header_buf_size);
- jnl->jhdr = (void *)0xbeefbabe;
-
- // Release reference on the mount
- if (jnl->fsmount)
- mount_drop(jnl->fsmount, 0);
-
- vnode_putname_printable(jnl->jdev_name);
-
- journal_unlock(jnl);
- lck_mtx_destroy(&jnl->old_start_lock, jnl_mutex_group);
- lck_mtx_destroy(&jnl->jlock, jnl_mutex_group);
- lck_mtx_destroy(&jnl->flock, jnl_mutex_group);
- FREE_ZONE(jnl, sizeof(struct journal), M_JNL_JNL);
-}
-
-static void
-dump_journal(journal *jnl)
-{
- transaction *ctr;
-
- printf("journal for dev %s:", jnl->jdev_name);
- printf(" jdev_offset %.8llx\n", jnl->jdev_offset);
- printf(" magic: 0x%.8x\n", jnl->jhdr->magic);
- printf(" start: 0x%.8llx\n", jnl->jhdr->start);
- printf(" end: 0x%.8llx\n", jnl->jhdr->end);
- printf(" size: 0x%.8llx\n", jnl->jhdr->size);
- printf(" blhdr size: %d\n", jnl->jhdr->blhdr_size);
- printf(" jhdr size: %d\n", jnl->jhdr->jhdr_size);
- printf(" chksum: 0x%.8x\n", jnl->jhdr->checksum);
-
- printf(" completed transactions:\n");
- for (ctr = jnl->completed_trs; ctr; ctr = ctr->next) {
- printf(" 0x%.8llx - 0x%.8llx\n", ctr->journal_start, ctr->journal_end);
- }
-}
-
-
-
-static off_t
-free_space(journal *jnl)
-{
- off_t free_space_offset;
-
- if (jnl->jhdr->start < jnl->jhdr->end) {
- free_space_offset = jnl->jhdr->size - (jnl->jhdr->end - jnl->jhdr->start) - jnl->jhdr->jhdr_size;
- } else if (jnl->jhdr->start > jnl->jhdr->end) {
- free_space_offset = jnl->jhdr->start - jnl->jhdr->end;
- } else {
- // journal is completely empty
- free_space_offset = jnl->jhdr->size - jnl->jhdr->jhdr_size;
- }
-
- return free_space_offset;
-}
-
-
-//
-// The journal must be locked on entry to this function.
-// The "desired_size" is in bytes.
-//
-static int
-check_free_space(journal *jnl, int desired_size, boolean_t *delayed_header_write, uint32_t sequence_num)
-{
- size_t i;
- int counter=0;
-
- //printf("jnl: check free space (desired 0x%x, avail 0x%Lx)\n",
- // desired_size, free_space(jnl));
-
- if (delayed_header_write)
- *delayed_header_write = FALSE;
-
- while (1) {
- int old_start_empty;
-
- // make sure there's space in the journal to hold this transaction
- if (free_space(jnl) > desired_size && jnl->old_start[0] == 0) {
- break;
- }
- if (counter++ == 5000) {
- dump_journal(jnl);
- panic("jnl: check_free_space: buffer flushing isn't working "
- "(jnl @ %p s %lld e %lld f %lld [active start %lld]).\n", jnl,
- jnl->jhdr->start, jnl->jhdr->end, free_space(jnl), jnl->active_start);
- }
- if (counter > 7500) {
- printf("jnl: %s: check_free_space: giving up waiting for free space.\n", jnl->jdev_name);
- return ENOSPC;
- }
-
- //
- // here's where we lazily bump up jnl->jhdr->start. we'll consume
- // entries until there is enough space for the next transaction.
- //
- old_start_empty = 1;
- lock_oldstart(jnl);
-
- for (i = 0; i < sizeof(jnl->old_start)/sizeof(jnl->old_start[0]); i++) {
- int lcl_counter;
-
- lcl_counter = 0;
- while (jnl->old_start[i] & 0x8000000000000000LL) {
- if (lcl_counter++ > 10000) {
- panic("jnl: check_free_space: tr starting @ 0x%llx not flushing (jnl %p).\n",
- jnl->old_start[i], jnl);
- }
-
- unlock_oldstart(jnl);
- if (jnl->flush) {
- jnl->flush(jnl->flush_arg);
- }
- tsleep((caddr_t)jnl, PRIBIO, "check_free_space1", 1);
- lock_oldstart(jnl);
- }
-
- if (jnl->old_start[i] == 0) {
- continue;
- }
-
- old_start_empty = 0;
- jnl->jhdr->start = jnl->old_start[i];
- jnl->old_start[i] = 0;
-
- if (free_space(jnl) > desired_size) {
-
- if (delayed_header_write)
- *delayed_header_write = TRUE;
- else {
- unlock_oldstart(jnl);
- write_journal_header(jnl, 1, sequence_num);
- lock_oldstart(jnl);
- }
- break;
- }
- }
- unlock_oldstart(jnl);
-
- // if we bumped the start, loop and try again
- if (i < sizeof(jnl->old_start)/sizeof(jnl->old_start[0])) {
- continue;
- } else if (old_start_empty) {
- //
- // if there is nothing in old_start anymore then we can
- // bump the jhdr->start to be the same as active_start
- // since it is possible there was only one very large
- // transaction in the old_start array. if we didn't do
- // this then jhdr->start would never get updated and we
- // would wind up looping until we hit the panic at the
- // start of the loop.
- //
- jnl->jhdr->start = jnl->active_start;
-
- if (delayed_header_write)
- *delayed_header_write = TRUE;
- else
- write_journal_header(jnl, 1, sequence_num);
- continue;
- }
-
-
- // if the file system gave us a flush function, call it to so that
- // it can flush some blocks which hopefully will cause some transactions
- // to complete and thus free up space in the journal.
- if (jnl->flush) {
- jnl->flush(jnl->flush_arg);
- }
-
- // wait for a while to avoid being cpu-bound (this will
- // put us to sleep for 10 milliseconds)
- tsleep((caddr_t)jnl, PRIBIO, "check_free_space2", 1);
- }
-
- return 0;
-}
-
-/*
- * Allocate a new active transaction.
- */
-static errno_t
-journal_allocate_transaction(journal *jnl)
-{
- transaction *tr;
- boolean_t was_vm_privileged = FALSE;
- kern_return_t retval;
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * the disk driver can allocate memory on this path...
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- MALLOC_ZONE(tr, transaction *, sizeof(transaction), M_JNL_TR, M_WAITOK);
- memset(tr, 0, sizeof(transaction));
-
- tr->tbuffer_size = jnl->tbuffer_size;
-
- retval = kmem_alloc_kobject(kernel_map, (vm_offset_t *)&tr->tbuffer, tr->tbuffer_size, VM_KERN_MEMORY_FILE);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
-
- if (retval) {
- FREE_ZONE(tr, sizeof(transaction), M_JNL_TR);
- jnl->active_tr = NULL;
- return ENOMEM;
- }
-
- // journal replay code checksum check depends on this.
- memset(tr->tbuffer, 0, BLHDR_CHECKSUM_SIZE);
- // Fill up the rest of the block with unimportant bytes (0x5a 'Z' chosen for visibility)
- memset(tr->tbuffer + BLHDR_CHECKSUM_SIZE, 0x5a, jnl->jhdr->blhdr_size - BLHDR_CHECKSUM_SIZE);
-
- tr->blhdr = (block_list_header *)tr->tbuffer;
- tr->blhdr->max_blocks = (jnl->jhdr->blhdr_size / sizeof(block_info)) - 1;
- tr->blhdr->num_blocks = 1; // accounts for this header block
- tr->blhdr->bytes_used = jnl->jhdr->blhdr_size;
- tr->blhdr->flags = BLHDR_CHECK_CHECKSUMS | BLHDR_FIRST_HEADER;
-
- tr->sequence_num = ++jnl->sequence_num;
- tr->num_blhdrs = 1;
- tr->total_bytes = jnl->jhdr->blhdr_size;
- tr->jnl = jnl;
-
- jnl->active_tr = tr;
-
- return 0;
-}
-
-int
-journal_start_transaction(journal *jnl)
-{
- int ret;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- if (jnl->flags & JOURNAL_INVALID) {
- return EINVAL;
- }
- if (jnl->owner == current_thread()) {
- if (jnl->active_tr == NULL) {
- panic("jnl: start_tr: active_tr is NULL (jnl @ %p, owner %p, current_thread %p\n",
- jnl, jnl->owner, current_thread());
- }
- jnl->nested_count++;
- return 0;
- }
-
- journal_lock(jnl);
-
- if (jnl->nested_count != 0 || jnl->active_tr != NULL) {
- panic("jnl: start_tr: owner %p, nested count %d, active_tr %p jnl @ %p\n",
- jnl->owner, jnl->nested_count, jnl->active_tr, jnl);
- }
-
- jnl->nested_count = 1;
-
-#if JOE
- // make sure there's room in the journal
- if (free_space(jnl) < jnl->tbuffer_size) {
-
- KERNEL_DEBUG(0xbbbbc030 | DBG_FUNC_START, jnl, 0, 0, 0, 0);
-
- // this is the call that really waits for space to free up
- // as well as updating jnl->jhdr->start
- if (check_free_space(jnl, jnl->tbuffer_size, NULL, jnl->sequence_num) != 0) {
- printf("jnl: %s: start transaction failed: no space\n", jnl->jdev_name);
- ret = ENOSPC;
- goto bad_start;
- }
- KERNEL_DEBUG(0xbbbbc030 | DBG_FUNC_END, jnl, 0, 0, 0, 0);
- }
-#endif
-
- // if there's a buffered transaction, use it.
- if (jnl->cur_tr) {
- jnl->active_tr = jnl->cur_tr;
- jnl->cur_tr = NULL;
-
- return 0;
- }
-
- ret = journal_allocate_transaction(jnl);
- if (ret) {
- goto bad_start;
- }
-
- // printf("jnl: start_tr: owner 0x%x new tr @ 0x%x\n", jnl->owner, jnl->active_tr);
-
- return 0;
-
-bad_start:
- jnl->nested_count = 0;
- journal_unlock(jnl);
-
- return ret;
-}
-
-
-int
-journal_modify_block_start(journal *jnl, struct buf *bp)
-{
- transaction *tr;
- boolean_t was_vm_privileged = FALSE;
-
- CHECK_JOURNAL(jnl);
-
-
- free_old_stuff(jnl);
-
- if (jnl->flags & JOURNAL_INVALID) {
- return EINVAL;
- }
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
-
- // XXXdbg - for debugging I want this to be true. later it may
- // not be necessary.
- if ((buf_flags(bp) & B_META) == 0) {
- panic("jnl: modify_block_start: bp @ %p is not a meta-data block! (jnl %p)\n", bp, jnl);
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: modify_block_start: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- //printf("jnl: mod block start (bp 0x%x vp 0x%x l/blkno %qd/%qd bsz %d; total bytes %d)\n",
- // bp, buf_vnode(bp), buf_lblkno(bp), buf_blkno(bp), buf_size(bp), tr->total_bytes);
-
- // can't allow blocks that aren't an even multiple of the
- // underlying block size.
- if ((buf_size(bp) % jnl->jhdr->jhdr_size) != 0) {
- uint32_t phys_blksz, bad=0;
-
- if (VNOP_IOCTL(jnl->jdev, DKIOCGETBLOCKSIZE, (caddr_t)&phys_blksz, 0, vfs_context_kernel())) {
- bad = 1;
- } else if (phys_blksz != (uint32_t)jnl->jhdr->jhdr_size) {
- if (phys_blksz < 512) {
- panic("jnl: mod block start: phys blksz %d is too small (%d, %d)\n",
- phys_blksz, buf_size(bp), jnl->jhdr->jhdr_size);
- }
-
- if ((buf_size(bp) % phys_blksz) != 0) {
- bad = 1;
- } else if (phys_blksz < (uint32_t)jnl->jhdr->jhdr_size) {
- jnl->jhdr->jhdr_size = phys_blksz;
- } else {
- // the phys_blksz is now larger... need to realloc the jhdr
- char *new_header_buf;
-
- printf("jnl: %s: phys blksz got bigger (was: %d/%d now %d)\n",
- jnl->jdev_name, jnl->header_buf_size, jnl->jhdr->jhdr_size, phys_blksz);
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&new_header_buf, phys_blksz, VM_KERN_MEMORY_FILE)) {
- printf("jnl: modify_block_start: %s: create: phys blksz change (was %d, now %d) but could not allocate space for new header\n",
- jnl->jdev_name, jnl->jhdr->jhdr_size, phys_blksz);
- bad = 1;
- } else {
- memcpy(new_header_buf, jnl->header_buf, jnl->header_buf_size);
- memset(&new_header_buf[jnl->header_buf_size], 0x18, (phys_blksz - jnl->header_buf_size));
- kmem_free(kernel_map, (vm_offset_t)jnl->header_buf, jnl->header_buf_size);
- jnl->header_buf = new_header_buf;
- jnl->header_buf_size = phys_blksz;
-
- jnl->jhdr = (journal_header *)jnl->header_buf;
- jnl->jhdr->jhdr_size = phys_blksz;
- }
- }
- } else {
- bad = 1;
- }
-
- if (bad) {
- panic("jnl: mod block start: bufsize %d not a multiple of block size %d\n",
- buf_size(bp), jnl->jhdr->jhdr_size);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
- return -1;
- }
- }
-
- // make sure that this transaction isn't bigger than the whole journal
- if (tr->total_bytes+buf_size(bp) >= (jnl->jhdr->size - jnl->jhdr->jhdr_size)) {
- panic("jnl: transaction too big (%d >= %lld bytes, bufsize %d, tr %p bp %p)\n",
- tr->total_bytes, (tr->jnl->jhdr->size - jnl->jhdr->jhdr_size), buf_size(bp), tr, bp);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
- return -1;
- }
-
- // if the block is dirty and not already locked we have to write
- // it out before we muck with it because it has data that belongs
- // (presumably) to another transaction.
- //
- if ((buf_flags(bp) & (B_DELWRI | B_LOCKED)) == B_DELWRI) {
-
- if (buf_flags(bp) & B_ASYNC) {
- panic("modify_block_start: bp @ %p has async flag set!\n", bp);
- }
- if (bp->b_shadow_ref)
- panic("modify_block_start: dirty bp @ %p has shadows!\n", bp);
-
- // this will cause it to not be buf_brelse()'d
- buf_setflags(bp, B_NORELSE);
- VNOP_BWRITE(bp);
- }
- buf_setflags(bp, B_LOCKED);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
-
- return 0;
-}
-
-int
-journal_modify_block_abort(journal *jnl, struct buf *bp)
-{
- transaction *tr;
- block_list_header *blhdr;
- int i;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- tr = jnl->active_tr;
-
- //
- // if there's no active transaction then we just want to
- // call buf_brelse() and return since this is just a block
- // that happened to be modified as part of another tr.
- //
- if (tr == NULL) {
- buf_brelse(bp);
- return 0;
- }
-
- if (jnl->flags & JOURNAL_INVALID) {
- /* Still need to buf_brelse(). Callers assume we consume the bp. */
- buf_brelse(bp);
- return EINVAL;
- }
-
- CHECK_TRANSACTION(tr);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: modify_block_abort: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- // printf("jnl: modify_block_abort: tr 0x%x bp 0x%x\n", jnl->active_tr, bp);
-
- // first check if it's already part of this transaction
- for (blhdr = tr->blhdr; blhdr; blhdr = (block_list_header *)((long)blhdr->binfo[0].bnum)) {
- for (i = 1; i < blhdr->num_blocks; i++) {
- if (bp == blhdr->binfo[i].u.bp) {
- break;
- }
- }
-
- if (i < blhdr->num_blocks) {
- break;
- }
- }
-
- //
- // if blhdr is null, then this block has only had modify_block_start
- // called on it as part of the current transaction. that means that
- // it is ok to clear the LOCKED bit since it hasn't actually been
- // modified. if blhdr is non-null then modify_block_end was called
- // on it and so we need to keep it locked in memory.
- //
- if (blhdr == NULL) {
- buf_clearflags(bp, B_LOCKED);
- }
-
- buf_brelse(bp);
- return 0;
-}
-
-
-int
-journal_modify_block_end(journal *jnl, struct buf *bp, void (*func)(buf_t bp, void *arg), void *arg)
-{
- int i = 1;
- int tbuffer_offset=0;
- block_list_header *blhdr, *prev=NULL;
- transaction *tr;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- if (jnl->flags & JOURNAL_INVALID) {
- /* Still need to buf_brelse(). Callers assume we consume the bp. */
- buf_brelse(bp);
- return EINVAL;
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: modify_block_end: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- //printf("jnl: mod block end: (bp 0x%x vp 0x%x l/blkno %qd/%qd bsz %d, total bytes %d)\n",
- // bp, buf_vnode(bp), buf_lblkno(bp), buf_blkno(bp), buf_size(bp), tr->total_bytes);
-
- if ((buf_flags(bp) & B_LOCKED) == 0) {
- panic("jnl: modify_block_end: bp %p not locked! jnl @ %p\n", bp, jnl);
- }
-
- // first check if it's already part of this transaction
- for (blhdr = tr->blhdr; blhdr; prev = blhdr, blhdr = (block_list_header *)((long)blhdr->binfo[0].bnum)) {
- tbuffer_offset = jnl->jhdr->blhdr_size;
-
- for (i = 1; i < blhdr->num_blocks; i++) {
- if (bp == blhdr->binfo[i].u.bp) {
- break;
- }
- if (blhdr->binfo[i].bnum != (off_t)-1) {
- tbuffer_offset += buf_size(blhdr->binfo[i].u.bp);
- } else {
- tbuffer_offset += blhdr->binfo[i].u.bi.bsize;
- }
- }
-
- if (i < blhdr->num_blocks) {
- break;
- }
- }
-
- if (blhdr == NULL
- && prev
- && (prev->num_blocks+1) <= prev->max_blocks
- && (prev->bytes_used+buf_size(bp)) <= (uint32_t)tr->tbuffer_size) {
- blhdr = prev;
-
- } else if (blhdr == NULL) {
- block_list_header *nblhdr;
- if (prev == NULL) {
- panic("jnl: modify block end: no way man, prev == NULL?!?, jnl %p, bp %p\n", jnl, bp);
- }
-
- // we got to the end of the list, didn't find the block and there's
- // no room in the block_list_header pointed to by prev
-
- // we allocate another tbuffer and link it in at the end of the list
- // through prev->binfo[0].bnum. that's a skanky way to do things but
- // avoids having yet another linked list of small data structures to manage.
-
- if (kmem_alloc_kobject(kernel_map, (vm_offset_t *)&nblhdr, tr->tbuffer_size, VM_KERN_MEMORY_FILE)) {
- panic("jnl: end_tr: no space for new block tr @ %p (total bytes: %d)!\n",
- tr, tr->total_bytes);
- }
-
- // journal replay code checksum check depends on this.
- memset(nblhdr, 0, BLHDR_CHECKSUM_SIZE);
- // Fill up the rest of the block with unimportant bytes
- memset(nblhdr + BLHDR_CHECKSUM_SIZE, 0x5a, jnl->jhdr->blhdr_size - BLHDR_CHECKSUM_SIZE);
-
- // initialize the new guy
- nblhdr->max_blocks = (jnl->jhdr->blhdr_size / sizeof(block_info)) - 1;
- nblhdr->num_blocks = 1; // accounts for this header block
- nblhdr->bytes_used = jnl->jhdr->blhdr_size;
- nblhdr->flags = BLHDR_CHECK_CHECKSUMS;
-
- tr->num_blhdrs++;
- tr->total_bytes += jnl->jhdr->blhdr_size;
-
- // then link him in at the end
- prev->binfo[0].bnum = (off_t)((long)nblhdr);
-
- // and finally switch to using the new guy
- blhdr = nblhdr;
- tbuffer_offset = jnl->jhdr->blhdr_size;
- i = 1;
- }
-
-
- if ((i+1) > blhdr->max_blocks) {
- panic("jnl: modify_block_end: i = %d, max_blocks %d\n", i, blhdr->max_blocks);
- }
-
- // if this is true then this is a new block we haven't seen
- if (i >= blhdr->num_blocks) {
- int bsize;
- vnode_t vp;
-
- vp = buf_vnode(bp);
- if (vnode_ref(vp)) {
- // Nobody checks the return values, so...
- jnl->flags |= JOURNAL_INVALID;
-
- buf_brelse(bp);
-
- // We're probably here due to a force unmount, so EIO is appropriate
- return EIO;
- }
-
- bsize = buf_size(bp);
-
- blhdr->binfo[i].bnum = (off_t)(buf_blkno(bp));
- blhdr->binfo[i].u.bp = bp;
-
- task_update_logical_writes(current_task(), (2 * bsize), TASK_WRITE_METADATA);
- KERNEL_DEBUG_CONSTANT(0x3018004, VM_KERNEL_ADDRPERM(vp), blhdr->binfo[i].bnum, bsize, 0, 0);
-
- if (func) {
- void (*old_func)(buf_t, void *)=NULL, *old_arg=NULL;
-
- buf_setfilter(bp, func, arg, &old_func, &old_arg);
- if (old_func != NULL && old_func != func) {
- panic("jnl: modify_block_end: old func %p / arg %p (func %p)", old_func, old_arg, func);
- }
- }
-
- blhdr->bytes_used += bsize;
- tr->total_bytes += bsize;
-
- blhdr->num_blocks++;
- }
- buf_bdwrite(bp);
-
- return 0;
-}
-
-int
-journal_kill_block(journal *jnl, struct buf *bp)
-{
- int i;
- int bflags;
- block_list_header *blhdr;
- transaction *tr;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- if (jnl->flags & JOURNAL_INVALID) {
- buf_brelse(bp);
- return 0;
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: modify_block_end: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- bflags = buf_flags(bp);
-
- if ( !(bflags & B_LOCKED))
- panic("jnl: modify_block_end: called with bp not B_LOCKED");
-
- /*
- * bp must be BL_BUSY and B_LOCKED
- * first check if it's already part of this transaction
- */
- for (blhdr = tr->blhdr; blhdr; blhdr = (block_list_header *)((long)blhdr->binfo[0].bnum)) {
-
- for (i = 1; i < blhdr->num_blocks; i++) {
- if (bp == blhdr->binfo[i].u.bp) {
- vnode_t vp;
-
- buf_clearflags(bp, B_LOCKED);
-
- // this undoes the vnode_ref() in journal_modify_block_end()
- vp = buf_vnode(bp);
- vnode_rele_ext(vp, 0, 1);
-
- // if the block has the DELWRI and FILTER bits sets, then
- // things are seriously weird. if it was part of another
- // transaction then journal_modify_block_start() should
- // have force it to be written.
- //
- //if ((bflags & B_DELWRI) && (bflags & B_FILTER)) {
- // panic("jnl: kill block: this defies all logic! bp 0x%x\n", bp);
- //} else {
- tr->num_killed += buf_size(bp);
- //}
- blhdr->binfo[i].bnum = (off_t)-1;
- blhdr->binfo[i].u.bp = NULL;
- blhdr->binfo[i].u.bi.bsize = buf_size(bp);
-
- buf_markinvalid(bp);
- buf_brelse(bp);
-
- return 0;
- }
- }
- }
-
- /*
- * We did not find the block in any transaction buffer but we still
- * need to release it or else it will be left locked forever.
- */
- buf_brelse(bp);
-
- return 0;
-}
-
-/*
-;________________________________________________________________________________
-;
-; Routine: journal_trim_set_callback
-;
-; Function: Provide the journal with a routine to be called back when a
-; TRIM has (or would have) been issued to the device. That
-; is, the transaction has been flushed to the device, and the
-; blocks freed by the transaction are now safe for reuse.
-;
-; CAUTION: If the journal becomes invalid (eg., due to an I/O
-; error when trying to write to the journal), this callback
-; will stop getting called, even if extents got freed before
-; the journal became invalid!
-;
-; Input Arguments:
-; jnl - The journal structure for the filesystem.
-; callback - The function to call when the TRIM is complete.
-; arg - An argument to be passed to callback.
-;________________________________________________________________________________
-*/
-__private_extern__ void
-journal_trim_set_callback(journal *jnl, jnl_trim_callback_t callback, void *arg)
-{
- jnl->trim_callback = callback;
- jnl->trim_callback_arg = arg;
-}
-
-
-/*
-;________________________________________________________________________________
-;
-; Routine: journal_trim_realloc
-;
-; Function: Increase the amount of memory allocated for the list of extents
-; to be unmapped (trimmed). This routine will be called when
-; adding an extent to the list, and the list already occupies
-; all of the space allocated to it. This routine returns ENOMEM
-; if unable to allocate more space, or 0 if the extent list was
-; grown successfully.
-;
-; Input Arguments:
-; trim - The trim list to be resized.
-;
-; Output:
-; (result) - ENOMEM or 0.
-;
-; Side effects:
-; The allocated_count and extents fields of tr->trim are updated
-; if the function returned 0.
-;________________________________________________________________________________
-*/
-static int
-trim_realloc(journal *jnl, struct jnl_trim_list *trim)
-{
- void *new_extents;
- uint32_t new_allocated_count;
- boolean_t was_vm_privileged = FALSE;
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REALLOC | DBG_FUNC_START, VM_KERNEL_ADDRPERM(trim), 0, trim->allocated_count, trim->extent_count, 0);
-
- new_allocated_count = trim->allocated_count + JOURNAL_DEFAULT_TRIM_EXTENTS;
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- new_extents = kalloc(new_allocated_count * sizeof(dk_extent_t));
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
-
- if (new_extents == NULL) {
- printf("jnl: trim_realloc: unable to grow extent list!\n");
- /*
- * Since we could be called when allocating space previously marked
- * to be trimmed, we need to empty out the list to be safe.
- */
- trim->extent_count = 0;
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REALLOC | DBG_FUNC_END, ENOMEM, 0, trim->allocated_count, 0, 0);
- return ENOMEM;
- }
-
- /* Copy the old extent list to the newly allocated list. */
- if (trim->extents != NULL) {
- memmove(new_extents,
- trim->extents,
- trim->allocated_count * sizeof(dk_extent_t));
- kfree(trim->extents,
- trim->allocated_count * sizeof(dk_extent_t));
- }
-
- trim->allocated_count = new_allocated_count;
- trim->extents = new_extents;
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REALLOC | DBG_FUNC_END, 0, 0, new_allocated_count, trim->extent_count, 0);
-
- return 0;
-}
-
-/*
- ;________________________________________________________________________________
- ;
- ; Routine: trim_search_extent
- ;
- ; Function: Search the given extent list to see if any of its extents
- ; overlap the given extent.
- ;
- ; Input Arguments:
- ; trim - The trim list to be searched.
- ; offset - The first byte of the range to be searched for.
- ; length - The number of bytes of the extent being searched for.
- ; overlap_start - start of the overlapping extent
- ; overlap_len - length of the overlapping extent
- ;
- ; Output:
- ; (result) - TRUE if one or more extents overlap, FALSE otherwise.
- ;________________________________________________________________________________
- */
-static int
-trim_search_extent(struct jnl_trim_list *trim, uint64_t offset,
- uint64_t length, uint64_t *overlap_start, uint64_t *overlap_len)
-{
- uint64_t end = offset + length;
- uint32_t lower = 0; /* Lowest index to search */
- uint32_t upper = trim->extent_count; /* Highest index to search + 1 */
- uint32_t middle;
-
- /* A binary search over the extent list. */
- while (lower < upper) {
- middle = (lower + upper) / 2;
-
- if (trim->extents[middle].offset >= end)
- upper = middle;
- else if (trim->extents[middle].offset + trim->extents[middle].length <= offset)
- lower = middle + 1;
- else {
- if (overlap_start) {
- *overlap_start = trim->extents[middle].offset;
- }
- if (overlap_len) {
- *overlap_len = trim->extents[middle].length;
- }
- return TRUE;
- }
- }
-
- return FALSE;
-}
-
-
-/*
-;________________________________________________________________________________
-;
-; Routine: journal_trim_add_extent
-;
-; Function: Keep track of extents that have been freed as part of this
-; transaction. If the underlying device supports TRIM (UNMAP),
-; then those extents will be trimmed/unmapped once the
-; transaction has been written to the journal. (For example,
-; SSDs can support trim/unmap and avoid having to recopy those
-; blocks when doing wear leveling, and may reuse the same
-; phsyical blocks for different logical blocks.)
-;
-; HFS also uses this, in combination with journal_trim_set_callback,
-; to add recently freed extents to its free extent cache, but
-; only after the transaction that freed them is committed to
-; disk. (This reduces the chance of overwriting live data in
-; a way that causes data loss if a transaction never gets
-; written to the journal.)
-;
-; Input Arguments:
-; jnl - The journal for the volume containing the byte range.
-; offset - The first byte of the range to be trimmed.
-; length - The number of bytes of the extent being trimmed.
-;________________________________________________________________________________
-*/
-__private_extern__ int
-journal_trim_add_extent(journal *jnl, uint64_t offset, uint64_t length)
-{
- uint64_t end;
- transaction *tr;
- dk_extent_t *extent;
- uint32_t insert_index;
- uint32_t replace_count;
-
- CHECK_JOURNAL(jnl);
-
- /* TODO: Is it OK to manipulate the trim list even if JOURNAL_INVALID is set? I think so... */
- if (jnl->flags & JOURNAL_INVALID) {
- return EINVAL;
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_ADD | DBG_FUNC_START, VM_KERNEL_ADDRPERM(jnl), offset, length, tr->trim.extent_count, 0);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: trim_add_extent: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- free_old_stuff(jnl);
-
- end = offset + length;
-
- /*
- * Find the range of existing extents that can be combined with the
- * input extent. We start by counting the number of extents that end
- * strictly before the input extent, then count the number of extents
- * that overlap or are contiguous with the input extent.
- */
- extent = tr->trim.extents;
- insert_index = 0;
- while (insert_index < tr->trim.extent_count && extent->offset + extent->length < offset) {
- ++insert_index;
- ++extent;
- }
- replace_count = 0;
- while (insert_index + replace_count < tr->trim.extent_count && extent->offset <= end) {
- ++replace_count;
- ++extent;
- }
-
- /*
- * If none of the existing extents can be combined with the input extent,
- * then just insert it in the list (before item number insert_index).
- */
- if (replace_count == 0) {
- /* If the list was already full, we need to grow it. */
- if (tr->trim.extent_count == tr->trim.allocated_count) {
- if (trim_realloc(jnl, &tr->trim) != 0) {
- printf("jnl: trim_add_extent: out of memory!");
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_ADD | DBG_FUNC_END, ENOMEM, 0, 0, tr->trim.extent_count, 0);
- return ENOMEM;
- }
- }
-
- /* Shift any existing extents with larger offsets. */
- if (insert_index < tr->trim.extent_count) {
- memmove(&tr->trim.extents[insert_index+1],
- &tr->trim.extents[insert_index],
- (tr->trim.extent_count - insert_index) * sizeof(dk_extent_t));
- }
- tr->trim.extent_count++;
-
- /* Store the new extent in the list. */
- tr->trim.extents[insert_index].offset = offset;
- tr->trim.extents[insert_index].length = length;
-
- /* We're done. */
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_ADD | DBG_FUNC_END, 0, 0, 0, tr->trim.extent_count, 0);
- return 0;
- }
-
- /*
- * Update extent number insert_index to be the union of the input extent
- * and all of the replaced extents.
- */
- if (tr->trim.extents[insert_index].offset < offset)
- offset = tr->trim.extents[insert_index].offset;
- extent = &tr->trim.extents[insert_index + replace_count - 1];
- if (extent->offset + extent->length > end)
- end = extent->offset + extent->length;
- tr->trim.extents[insert_index].offset = offset;
- tr->trim.extents[insert_index].length = end - offset;
-
- /*
- * If we were replacing more than one existing extent, then shift any
- * extents with larger offsets, and update the count of extents.
- *
- * We're going to leave extent #insert_index alone since it was just updated, above.
- * We need to move extents from index (insert_index + replace_count) through the end of
- * the list by (replace_count - 1) positions so that they overwrite extent #(insert_index + 1).
- */
- if (replace_count > 1 && (insert_index + replace_count) < tr->trim.extent_count) {
- memmove(&tr->trim.extents[insert_index + 1],
- &tr->trim.extents[insert_index + replace_count],
- (tr->trim.extent_count - insert_index - replace_count) * sizeof(dk_extent_t));
- }
- tr->trim.extent_count -= replace_count - 1;
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_ADD | DBG_FUNC_END, 0, 0, 0, tr->trim.extent_count, 0);
- return 0;
-}
-
-/*
- * journal_trim_extent_overlap
- *
- * Return 1 if there are any pending TRIMs that overlap with the given offset and length
- * Return 0 otherwise.
- */
-
-int journal_trim_extent_overlap (journal *jnl, uint64_t offset, uint64_t length, uint64_t *end) {
- transaction *tr = NULL;
- int overlap = 0;
-
- uint64_t overlap_start;
- uint64_t overlap_len;
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- /*
- * There are two lists that need to be examined for potential overlaps:
- *
- * The first is the current transaction. Since this function requires that
- * a transaction be active when this is called, this is the "active_tr"
- * pointer in the journal struct. This has a trimlist pointer which needs
- * to be searched.
- */
- overlap = trim_search_extent (&tr->trim, offset, length, &overlap_start, &overlap_len);
- if (overlap == 0) {
- /*
- * The second is the async trim list, which is only done if the current
- * transaction group (active transaction) did not overlap with our target
- * extent. This async trim list is the set of all previously
- * committed transaction groups whose I/Os are now in-flight. We need to hold the
- * trim lock in order to search this list. If we grab the list before the
- * TRIM has completed, then we will compare it. If it is grabbed AFTER the
- * TRIM has completed, then the pointer will be zeroed out and we won't have
- * to check anything.
- */
- lck_rw_lock_shared (&jnl->trim_lock);
- if (jnl->async_trim != NULL) {
- overlap = trim_search_extent(jnl->async_trim, offset, length, &overlap_start, &overlap_len);
- }
- lck_rw_unlock_shared (&jnl->trim_lock);
- }
-
- if (overlap) {
- /* compute the end (min) of the overlapping range */
- if ( (overlap_start + overlap_len) < (offset + length)) {
- *end = (overlap_start + overlap_len);
- }
- else {
- *end = (offset + length);
- }
- }
-
-
- return overlap;
-}
-
-/*
- * journal_request_immediate_flush
- *
- * FS requests that the journal flush immediately upon the
- * active transaction's completion.
- *
- * Returns 0 if operation succeeds
- * Returns EPERM if we failed to leave hint
- */
-int
-journal_request_immediate_flush (journal *jnl) {
-
- transaction *tr = NULL;
- /*
- * Is a transaction still in process? You must do
- * this while there are txns open
- */
- tr = jnl->active_tr;
- if (tr != NULL) {
- CHECK_TRANSACTION(tr);
- tr->flush_on_completion = TRUE;
- }
- else {
- return EPERM;
- }
- return 0;
-}
-
-
-
-/*
-;________________________________________________________________________________
-;
-; Routine: trim_remove_extent
-;
-; Function: Indicate that a range of bytes, some of which may have previously
-; been passed to journal_trim_add_extent, is now allocated.
-; Any overlapping ranges currently in the journal's trim list will
-; be removed. If the underlying device supports TRIM (UNMAP), then
-; these extents will not be trimmed/unmapped when the transaction
-; is written to the journal.
-;
-; HFS also uses this to prevent newly allocated space from being
-; added to its free extent cache (if some portion of the newly
-; allocated space was recently freed).
-;
-; Input Arguments:
-; trim - The trim list to update.
-; offset - The first byte of the range to be trimmed.
-; length - The number of bytes of the extent being trimmed.
-;________________________________________________________________________________
-*/
-static int
-trim_remove_extent(journal *jnl, struct jnl_trim_list *trim, uint64_t offset, uint64_t length)
-{
- u_int64_t end;
- dk_extent_t *extent;
- u_int32_t keep_before;
- u_int32_t keep_after;
-
- end = offset + length;
-
- /*
- * Find any existing extents that start before or end after the input
- * extent. These extents will be modified if they overlap the input
- * extent. Other extents between them will be deleted.
- */
- extent = trim->extents;
- keep_before = 0;
- while (keep_before < trim->extent_count && extent->offset < offset) {
- ++keep_before;
- ++extent;
- }
- keep_after = keep_before;
- if (keep_after > 0) {
- /* See if previous extent extends beyond both ends of input extent. */
- --keep_after;
- --extent;
- }
- while (keep_after < trim->extent_count && (extent->offset + extent->length) <= end) {
- ++keep_after;
- ++extent;
- }
-
- /*
- * When we get here, the first keep_before extents (0 .. keep_before-1)
- * start before the input extent, and extents (keep_after .. extent_count-1)
- * end after the input extent. We'll need to keep, all of those extents,
- * but possibly modify #(keep_before-1) and #keep_after to remove the portion
- * that overlaps with the input extent.
- */
-
- /*
- * Does the input extent start after and end before the same existing
- * extent? If so, we have to "punch a hole" in that extent and convert
- * it to two separate extents.
- */
- if (keep_before > keep_after) {
- /* If the list was already full, we need to grow it. */
- if (trim->extent_count == trim->allocated_count) {
- if (trim_realloc(jnl, trim) != 0) {
- printf("jnl: trim_remove_extent: out of memory!");
- return ENOMEM;
- }
- }
-
- /*
- * Make room for a new extent by shifting extents #keep_after and later
- * down by one extent. When we're done, extents #keep_before and
- * #keep_after will be identical, and we can fall through to removing
- * the portion that overlaps the input extent.
- */
- memmove(&trim->extents[keep_before],
- &trim->extents[keep_after],
- (trim->extent_count - keep_after) * sizeof(dk_extent_t));
- ++trim->extent_count;
- ++keep_after;
-
- /*
- * Fall through. We now have the case where the length of extent
- * #(keep_before - 1) needs to be updated, and the start of extent
- * #(keep_after) needs to be updated.
- */
- }
-
- /*
- * May need to truncate the end of extent #(keep_before - 1) if it overlaps
- * the input extent.
- */
- if (keep_before > 0) {
- extent = &trim->extents[keep_before - 1];
- if (extent->offset + extent->length > offset) {
- extent->length = offset - extent->offset;
- }
- }
-
- /*
- * May need to update the start of extent #(keep_after) if it overlaps the
- * input extent.
- */
- if (keep_after < trim->extent_count) {
- extent = &trim->extents[keep_after];
- if (extent->offset < end) {
- extent->length = extent->offset + extent->length - end;
- extent->offset = end;
- }
- }
-
- /*
- * If there were whole extents that overlapped the input extent, get rid
- * of them by shifting any following extents, and updating the count.
- */
- if (keep_after > keep_before && keep_after < trim->extent_count) {
- memmove(&trim->extents[keep_before],
- &trim->extents[keep_after],
- (trim->extent_count - keep_after) * sizeof(dk_extent_t));
- }
- trim->extent_count -= keep_after - keep_before;
-
- return 0;
-}
-
-/*
- ;________________________________________________________________________________
- ;
- ; Routine: journal_trim_remove_extent
- ;
- ; Function: Make note of a range of bytes, some of which may have previously
- ; been passed to journal_trim_add_extent, is now in use on the
- ; volume. The given bytes will be not be trimmed as part of
- ; this transaction, or a pending trim of a transaction being
- ; asynchronously flushed.
- ;
- ; Input Arguments:
- ; jnl - The journal for the volume containing the byte range.
- ; offset - The first byte of the range to be trimmed.
- ; length - The number of bytes of the extent being trimmed.
- ;________________________________________________________________________________
- */
-__private_extern__ int
-journal_trim_remove_extent(journal *jnl, uint64_t offset, uint64_t length)
-{
- int error = 0;
- transaction *tr;
-
- CHECK_JOURNAL(jnl);
-
- /* TODO: Is it OK to manipulate the trim list even if JOURNAL_INVALID is set? I think so... */
- if (jnl->flags & JOURNAL_INVALID) {
- return EINVAL;
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REMOVE | DBG_FUNC_START, VM_KERNEL_ADDRPERM(jnl), offset, length, tr->trim.extent_count, 0);
-
- if (jnl->owner != current_thread()) {
- panic("jnl: trim_remove_extent: called w/out a transaction! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- free_old_stuff(jnl);
-
- error = trim_remove_extent(jnl, &tr->trim, offset, length);
- if (error == 0) {
- int found = FALSE;
-
- /*
- * See if a pending trim has any extents that overlap with the
- * one we were given.
- */
- lck_rw_lock_shared(&jnl->trim_lock);
- if (jnl->async_trim != NULL)
- found = trim_search_extent(jnl->async_trim, offset, length, NULL, NULL);
- lck_rw_unlock_shared(&jnl->trim_lock);
-
- if (found) {
- /*
- * There was an overlap, so avoid trimming the extent we
- * just allocated. (Otherwise, it might get trimmed after
- * we've written to it, which will cause that data to be
- * corrupted.)
- */
- uint32_t async_extent_count = 0;
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REMOVE_PENDING | DBG_FUNC_START, VM_KERNEL_ADDRPERM(jnl), offset, length, 0, 0);
- lck_rw_lock_exclusive(&jnl->trim_lock);
- if (jnl->async_trim != NULL) {
- error = trim_remove_extent(jnl, jnl->async_trim, offset, length);
- async_extent_count = jnl->async_trim->extent_count;
- }
- lck_rw_unlock_exclusive(&jnl->trim_lock);
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REMOVE_PENDING | DBG_FUNC_END, error, 0, 0, async_extent_count, 0);
- }
- }
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_REMOVE | DBG_FUNC_END, error, 0, 0, tr->trim.extent_count, 0);
- return error;
-}
-
-
-static int
-journal_trim_flush(journal *jnl, transaction *tr)
-{
- int errno = 0;
- boolean_t was_vm_privileged = FALSE;
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_FLUSH | DBG_FUNC_START, VM_KERNEL_ADDRPERM(jnl), tr, 0, tr->trim.extent_count, 0);
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * the disk driver can allocate memory on this path...
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- lck_rw_lock_shared(&jnl->trim_lock);
- if (tr->trim.extent_count > 0) {
- dk_unmap_t unmap;
-
- bzero(&unmap, sizeof(unmap));
- if (CONFIG_HFS_TRIM && (jnl->flags & JOURNAL_USE_UNMAP)) {
- unmap.extents = tr->trim.extents;
- unmap.extentsCount = tr->trim.extent_count;
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_UNMAP | DBG_FUNC_START, VM_KERNEL_ADDRPERM(jnl), tr, 0, tr->trim.extent_count, 0);
- errno = VNOP_IOCTL(jnl->fsdev, DKIOCUNMAP, (caddr_t)&unmap, FWRITE, vfs_context_kernel());
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_UNMAP | DBG_FUNC_END, errno, 0, 0, 0, 0);
- }
-
- /*
- * Call back into the file system to tell them that we have
- * trimmed some extents and that they can now be reused.
- *
- * CAUTION: If the journal becomes invalid (eg., due to an I/O
- * error when trying to write to the journal), this callback
- * will stop getting called, even if extents got freed before
- * the journal became invalid!
- */
- if (jnl->trim_callback)
- jnl->trim_callback(jnl->trim_callback_arg, tr->trim.extent_count, tr->trim.extents);
- }
- lck_rw_unlock_shared(&jnl->trim_lock);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
- /*
- * If the transaction we're flushing was the async transaction, then
- * tell the current transaction that there is no pending trim
- * any more.
- *
- * NOTE: Since we released the lock, another thread could have
- * removed one or more extents from our list. That's not a
- * problem since any writes to the re-allocated blocks
- * would get sent to the device after the DKIOCUNMAP.
- */
- lck_rw_lock_exclusive(&jnl->trim_lock);
- if (jnl->async_trim == &tr->trim)
- jnl->async_trim = NULL;
- lck_rw_unlock_exclusive(&jnl->trim_lock);
-
- /*
- * By the time we get here, no other thread can discover the address
- * of "tr", so it is safe for us to manipulate tr->trim without
- * holding any locks.
- */
- if (tr->trim.extents) {
- kfree(tr->trim.extents, tr->trim.allocated_count * sizeof(dk_extent_t));
- tr->trim.allocated_count = 0;
- tr->trim.extent_count = 0;
- tr->trim.extents = NULL;
- }
-
- if (jnl_kdebug)
- KERNEL_DEBUG_CONSTANT(DBG_JOURNAL_TRIM_FLUSH | DBG_FUNC_END, errno, 0, 0, 0, 0);
-
- return errno;
-}
-
-static int
-journal_binfo_cmp(const void *a, const void *b)
-{
- const block_info *bi_a = (const struct block_info *)a;
- const block_info *bi_b = (const struct block_info *)b;
- daddr64_t res;
-
- if (bi_a->bnum == (off_t)-1) {
- return 1;
- }
- if (bi_b->bnum == (off_t)-1) {
- return -1;
- }
-
- // don't have to worry about negative block
- // numbers so this is ok to do.
- //
- res = (buf_blkno(bi_a->u.bp) - buf_blkno(bi_b->u.bp));
-
- return (int)res;
-}
-
-
-/*
- * End a transaction. If the transaction is small enough, and we're not forcing
- * a write to disk, the "active" transaction becomes the "current" transaction,
- * and will be reused for the next transaction that is started (group commit).
- *
- * If the transaction gets written to disk (because force_it is true, or no
- * group commit, or the transaction is sufficiently full), the blocks get
- * written into the journal first, then the are written asynchronously. When
- * those async writes complete, the transaction can be freed and removed from
- * the journal.
- *
- * An optional callback can be supplied. If given, it is called after the
- * the blocks have been written to the journal, but before the async writes
- * of those blocks to their normal on-disk locations. This is used by
- * journal_relocate so that the location of the journal can be changed and
- * flushed to disk before the blocks get written to their normal locations.
- * Note that the callback is only called if the transaction gets written to
- * the journal during this end_transaction call; you probably want to set the
- * force_it flag.
- *
- * Inputs:
- * tr Transaction to add to the journal
- * force_it If true, force this transaction to the on-disk journal immediately.
- * callback See description above. Pass NULL for no callback.
- * callback_arg Argument passed to callback routine.
- *
- * Result
- * 0 No errors
- * -1 An error occurred. The journal is marked invalid.
- */
-static int
-end_transaction(transaction *tr, int force_it, errno_t (*callback)(void*), void *callback_arg, boolean_t drop_lock, boolean_t must_wait)
-{
- block_list_header *blhdr=NULL, *next=NULL;
- int i, ret_val = 0;
- errno_t errno;
- journal *jnl = tr->jnl;
- struct buf *bp;
- size_t tbuffer_offset;
- boolean_t drop_lock_early;
-
- if (jnl->cur_tr) {
- panic("jnl: jnl @ %p already has cur_tr %p, new tr: %p\n",
- jnl, jnl->cur_tr, tr);
- }
-
- // if there weren't any modified blocks in the transaction
- // just save off the transaction pointer and return.
- if (tr->total_bytes == jnl->jhdr->blhdr_size) {
- jnl->cur_tr = tr;
- goto done;
- }
-
- // if our transaction buffer isn't very full, just hang
- // on to it and don't actually flush anything. this is
- // what is known as "group commit". we will flush the
- // transaction buffer if it's full or if we have more than
- // one of them so we don't start hogging too much memory.
- //
- // We also check the device supports UNMAP/TRIM, and if so,
- // the number of extents waiting to be trimmed. If it is
- // small enough, then keep accumulating more (so we can
- // reduce the overhead of trimming). If there was a prior
- // trim error, then we stop issuing trims for this
- // volume, so we can also coalesce transactions.
- //
- if ( force_it == 0
- && (jnl->flags & JOURNAL_NO_GROUP_COMMIT) == 0
- && tr->num_blhdrs < 3
- && (tr->total_bytes <= ((tr->tbuffer_size*tr->num_blhdrs) - tr->tbuffer_size/8))
- && (!(jnl->flags & JOURNAL_USE_UNMAP) || (tr->trim.extent_count < jnl_trim_flush_limit))) {
-
- jnl->cur_tr = tr;
- goto done;
- }
-
- KERNEL_DEBUG(0xbbbbc018|DBG_FUNC_START, jnl, tr, drop_lock, must_wait, 0);
-
- lock_condition(jnl, &jnl->flushing, "end_transaction");
-
- /*
- * if the previous 'finish_end_transaction' was being run
- * asynchronously, it could have encountered a condition
- * that caused it to mark the journal invalid... if that
- * occurred while we were waiting for it to finish, we
- * need to notice and abort the current transaction
- */
- if ((jnl->flags & JOURNAL_INVALID) || jnl->flush_aborted == TRUE) {
- unlock_condition(jnl, &jnl->flushing);
-
- abort_transaction(jnl, tr);
- ret_val = -1;
- KERNEL_DEBUG(0xbbbbc018|DBG_FUNC_END, jnl, tr, ret_val, 0, 0);
- goto done;
- }
-
- /*
- * Store a pointer to this transaction's trim list so that
- * future transactions can find it.
- *
- * Note: if there are no extents in the trim list, then don't
- * bother saving the pointer since nothing can add new extents
- * to the list (and other threads/transactions only care if
- * there is a trim pending).
- */
- lck_rw_lock_exclusive(&jnl->trim_lock);
- if (jnl->async_trim != NULL)
- panic("jnl: end_transaction: async_trim already non-NULL!");
- if (tr->trim.extent_count > 0)
- jnl->async_trim = &tr->trim;
- lck_rw_unlock_exclusive(&jnl->trim_lock);
-
- /*
- * snapshot the transaction sequence number while we are still behind
- * the journal lock since it will be bumped upon the start of the
- * next transaction group which may overlap the current journal flush...
- * we pass the snapshot into write_journal_header during the journal
- * flush so that it can write the correct version in the header...
- * because we hold the 'flushing' condition variable for the duration
- * of the journal flush, 'saved_sequence_num' remains stable
- */
- jnl->saved_sequence_num = jnl->sequence_num;
-
- /*
- * if we're here we're going to flush the transaction buffer to disk.
- * 'check_free_space' will not return untl there is enough free
- * space for this transaction in the journal and jnl->old_start[0]
- * is avaiable for use
- */
- KERNEL_DEBUG(0xbbbbc030 | DBG_FUNC_START, jnl, 0, 0, 0, 0);
-
- check_free_space(jnl, tr->total_bytes, &tr->delayed_header_write, jnl->saved_sequence_num);
-
- KERNEL_DEBUG(0xbbbbc030 | DBG_FUNC_END, jnl, tr->delayed_header_write, 0, 0, 0);
-
- // range check the end index
- if (jnl->jhdr->end <= 0 || jnl->jhdr->end > jnl->jhdr->size) {
- panic("jnl: end_transaction: end is bogus 0x%llx (sz 0x%llx)\n",
- jnl->jhdr->end, jnl->jhdr->size);
- }
- if (tr->delayed_header_write == TRUE) {
- thread_t thread = THREAD_NULL;
-
- lock_condition(jnl, &jnl->writing_header, "end_transaction");
- /*
- * fire up a thread to write the journal header
- * asynchronously... when it finishes, it will call
- * unlock_condition... we can overlap the preparation of
- * the log and buffers during this time
- */
- kernel_thread_start((thread_continue_t)write_header_thread, jnl, &thread);
- } else
- jnl->write_header_failed = FALSE;
-
-
- // this transaction starts where the current journal ends
- tr->journal_start = jnl->jhdr->end;
-
- lock_oldstart(jnl);
- /*
- * Because old_start is locked above, we can cast away the volatile qualifier before passing it to memcpy.
- * slide everyone else down and put our latest guy in the last
- * entry in the old_start array
- */
- memcpy(__CAST_AWAY_QUALIFIER(&jnl->old_start[0], volatile, void *), __CAST_AWAY_QUALIFIER(&jnl->old_start[1], volatile, void *), sizeof(jnl->old_start)-sizeof(jnl->old_start[0]));
- jnl->old_start[sizeof(jnl->old_start)/sizeof(jnl->old_start[0]) - 1] = tr->journal_start | 0x8000000000000000LL;
-
- unlock_oldstart(jnl);
-
-
- for (blhdr = tr->blhdr; blhdr; blhdr = next) {
- char *blkptr;
- buf_t sbp;
- int32_t bsize;
-
- tbuffer_offset = jnl->jhdr->blhdr_size;
-
- for (i = 1; i < blhdr->num_blocks; i++) {
-
- if (blhdr->binfo[i].bnum != (off_t)-1) {
- void (*func)(buf_t, void *);
- void *arg;
-
- bp = blhdr->binfo[i].u.bp;
-
- if (bp == NULL) {
- panic("jnl: inconsistent binfo (NULL bp w/bnum %lld; jnl @ %p, tr %p)\n",
- blhdr->binfo[i].bnum, jnl, tr);
- }
- /*
- * acquire the bp here so that we can safely
- * mess around with its data. buf_acquire()
- * will return EAGAIN if the buffer was busy,
- * so loop trying again.
- */
- do {
- errno = buf_acquire(bp, BAC_REMOVE, 0, 0);
- } while (errno == EAGAIN);
-
- if (errno)
- panic("could not acquire bp %p (err %d)\n", bp, errno);
-
- if ((buf_flags(bp) & (B_LOCKED|B_DELWRI)) != (B_LOCKED|B_DELWRI)) {
- if (jnl->flags & JOURNAL_CLOSE_PENDING) {
- buf_clearflags(bp, B_LOCKED);
- buf_brelse(bp);
-
- /*
- * this is an odd case that appears to happen occasionally
- * make sure we mark this block as no longer valid
- * so that we don't process it in "finish_end_transaction" since
- * the bp that is recorded in our array no longer belongs
- * to us (normally we substitute a shadow bp to be processed
- * issuing a 'buf_bawrite' on a stale buf_t pointer leads
- * to all kinds of problems.
- */
- blhdr->binfo[i].bnum = (off_t)-1;
- continue;
- } else {
- panic("jnl: end_tr: !!!DANGER!!! bp %p flags (0x%x) not LOCKED & DELWRI\n", bp, buf_flags(bp));
- }
- }
- bsize = buf_size(bp);
-
- buf_setfilter(bp, NULL, NULL, &func, &arg);
-
- blkptr = (char *)&((char *)blhdr)[tbuffer_offset];
-
- sbp = buf_create_shadow_priv(bp, FALSE, (uintptr_t)blkptr, 0, 0);
-
- if (sbp == NULL)
- panic("jnl: buf_create_shadow returned NULL");
-
- /*
- * copy the data into the transaction buffer...
- */
- memcpy(blkptr, (char *)buf_dataptr(bp), bsize);
-
- buf_clearflags(bp, B_LOCKED);
- buf_markclean(bp);
- buf_drop(bp);
-
- /*
- * adopt the shadow buffer for this block
- */
- if (func) {
- /*
- * transfer FS hook function to the
- * shadow buffer... it will get called
- * in finish_end_transaction
- */
- buf_setfilter(sbp, func, arg, NULL, NULL);
- }
- blhdr->binfo[i].u.bp = sbp;
-
- } else {
- // bnum == -1, only true if a block was "killed"
- bsize = blhdr->binfo[i].u.bi.bsize;
- }
- tbuffer_offset += bsize;
- }
- next = (block_list_header *)((long)blhdr->binfo[0].bnum);
- }
- /*
- * if callback != NULL, we don't want to drop the journal
- * lock, or complete end_transaction asynchronously, since
- * the caller is expecting the callback to run in the calling
- * context
- *
- * if drop_lock == FALSE, we can't complete end_transaction
- * asynchronously
- */
- if (callback)
- drop_lock_early = FALSE;
- else
- drop_lock_early = drop_lock;
-
- if (drop_lock_early == FALSE)
- must_wait = TRUE;
-
- if (drop_lock_early == TRUE) {
- journal_unlock(jnl);
- drop_lock = FALSE;
- }
- if (must_wait == TRUE)
- ret_val = finish_end_transaction(tr, callback, callback_arg);
- else {
- thread_t thread = THREAD_NULL;
-
- /*
- * fire up a thread to complete processing this transaction
- * asynchronously... when it finishes, it will call
- * unlock_condition
- */
- kernel_thread_start((thread_continue_t)finish_end_thread, tr, &thread);
- }
- KERNEL_DEBUG(0xbbbbc018|DBG_FUNC_END, jnl, tr, ret_val, 0, 0);
-done:
- if (drop_lock == TRUE) {
- journal_unlock(jnl);
- }
- return (ret_val);
-}
-
-
-static void
-finish_end_thread(transaction *tr)
-{
- proc_set_task_policy(current_task(), current_thread(),
- TASK_POLICY_INTERNAL, TASK_POLICY_IOPOL, IOPOL_PASSIVE);
-
- finish_end_transaction(tr, NULL, NULL);
-
- thread_deallocate(current_thread());
- thread_terminate(current_thread());
-}
-
-static void
-write_header_thread(journal *jnl)
-{
- proc_set_task_policy(current_task(), current_thread(),
- TASK_POLICY_INTERNAL, TASK_POLICY_IOPOL, IOPOL_PASSIVE);
-
- if (write_journal_header(jnl, 1, jnl->saved_sequence_num))
- jnl->write_header_failed = TRUE;
- else
- jnl->write_header_failed = FALSE;
- unlock_condition(jnl, &jnl->writing_header);
-
- thread_deallocate(current_thread());
- thread_terminate(current_thread());
-}
-
-static int
-finish_end_transaction(transaction *tr, errno_t (*callback)(void*), void *callback_arg)
-{
- int i, amt;
- int ret = 0;
- off_t end;
- journal *jnl = tr->jnl;
- buf_t bp, *bparray;
- vnode_t vp;
- block_list_header *blhdr=NULL, *next=NULL;
- size_t tbuffer_offset;
- int bufs_written = 0;
- int ret_val = 0;
- boolean_t was_vm_privileged = FALSE;
-
- KERNEL_DEBUG(0xbbbbc028|DBG_FUNC_START, jnl, tr, 0, 0, 0);
-
- if (jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) {
- /*
- * if we block waiting for memory, and there is enough pressure to
- * cause us to try and create a new swap file, we may end up deadlocking
- * due to waiting for the journal on the swap file creation path...
- * by making ourselves vm_privileged, we give ourselves the best chance
- * of not blocking
- */
- was_vm_privileged = set_vm_privilege(TRUE);
- }
- end = jnl->jhdr->end;
-
- for (blhdr = tr->blhdr; blhdr; blhdr = (block_list_header *)((long)blhdr->binfo[0].bnum)) {
-
- amt = blhdr->bytes_used;
-
- blhdr->binfo[0].u.bi.b.sequence_num = tr->sequence_num;
-
- blhdr->checksum = 0;
- blhdr->checksum = calc_checksum((char *)blhdr, BLHDR_CHECKSUM_SIZE);
-
- if (kmem_alloc(kernel_map, (vm_offset_t *)&bparray, blhdr->num_blocks * sizeof(struct buf *), VM_KERN_MEMORY_FILE)) {
- panic("can't allocate %zd bytes for bparray\n", blhdr->num_blocks * sizeof(struct buf *));
- }
- tbuffer_offset = jnl->jhdr->blhdr_size;
-
- for (i = 1; i < blhdr->num_blocks; i++) {
- void (*func)(buf_t, void *);
- void *arg;
- int32_t bsize;
-
- /*
- * finish preparing the shadow buf_t before
- * calculating the individual block checksums
- */
- if (blhdr->binfo[i].bnum != (off_t)-1) {
- daddr64_t blkno;
- daddr64_t lblkno;
-
- bp = blhdr->binfo[i].u.bp;
-
- vp = buf_vnode(bp);
- blkno = buf_blkno(bp);
- lblkno = buf_lblkno(bp);
-
- if (vp == NULL && lblkno == blkno) {
- printf("jnl: %s: end_tr: bad news! buffer w/null vp and l/blkno = %qd/%qd. aborting the transaction.\n",
- jnl->jdev_name, lblkno, blkno);
- ret_val = -1;
- goto bad_journal;
- }
-
- // if the lblkno is the same as blkno and this bp isn't
- // associated with the underlying file system device then
- // we need to call bmap() to get the actual physical block.
- //
- if ((lblkno == blkno) && (vp != jnl->fsdev)) {
- off_t f_offset;
- size_t contig_bytes;
-
- if (VNOP_BLKTOOFF(vp, lblkno, &f_offset)) {
- printf("jnl: %s: end_tr: vnop_blktooff failed\n", jnl->jdev_name);
- ret_val = -1;
- goto bad_journal;
- }
- if (VNOP_BLOCKMAP(vp, f_offset, buf_count(bp), &blkno, &contig_bytes, NULL, 0, NULL)) {
- printf("jnl: %s: end_tr: can't blockmap the buffer", jnl->jdev_name);
- ret_val = -1;
- goto bad_journal;
- }
- if ((uint32_t)contig_bytes < buf_count(bp)) {
- printf("jnl: %s: end_tr: blk not physically contiguous on disk\n", jnl->jdev_name);
- ret_val = -1;
- goto bad_journal;
- }
- buf_setblkno(bp, blkno);
- }
- // update this so we write out the correct physical block number!
- blhdr->binfo[i].bnum = (off_t)(blkno);
-
- /*
- * pick up the FS hook function (if any) and prepare
- * to fire this buffer off in the next pass
- */
- buf_setfilter(bp, buffer_flushed_callback, tr, &func, &arg);
-
- if (func) {
- /*
- * call the hook function supplied by the filesystem...
- * this needs to happen BEFORE cacl_checksum in case
- * the FS morphs the data in the buffer
- */
- func(bp, arg);
- }
- bparray[i] = bp;
- bsize = buf_size(bp);
- blhdr->binfo[i].u.bi.bsize = bsize;
- blhdr->binfo[i].u.bi.b.cksum = calc_checksum(&((char *)blhdr)[tbuffer_offset], bsize);
- } else {
- bparray[i] = NULL;
- bsize = blhdr->binfo[i].u.bi.bsize;
- blhdr->binfo[i].u.bi.b.cksum = 0;
- }
- tbuffer_offset += bsize;
- }
- /*
- * if we fired off the journal_write_header asynchronously in
- * 'end_transaction', we need to wait for its completion
- * before writing the actual journal data
- */
- wait_condition(jnl, &jnl->writing_header, "finish_end_transaction");
-
- if (jnl->write_header_failed == FALSE)
- ret = write_journal_data(jnl, &end, blhdr, amt);
- else
- ret_val = -1;
- /*
- * put the bp pointers back so that we can
- * make the final pass on them
- */
- for (i = 1; i < blhdr->num_blocks; i++)
- blhdr->binfo[i].u.bp = bparray[i];
-
- kmem_free(kernel_map, (vm_offset_t)bparray, blhdr->num_blocks * sizeof(struct buf *));
-
- if (ret_val == -1)
- goto bad_journal;
-
- if (ret != amt) {
- printf("jnl: %s: end_transaction: only wrote %d of %d bytes to the journal!\n",
- jnl->jdev_name, ret, amt);
-
- ret_val = -1;
- goto bad_journal;
- }
- }
- jnl->jhdr->end = end; // update where the journal now ends
- tr->journal_end = end; // the transaction ends here too
-
- if (tr->journal_start == 0 || tr->journal_end == 0) {
- panic("jnl: end_transaction: bad tr journal start/end: 0x%llx 0x%llx\n",
- tr->journal_start, tr->journal_end);
- }
-
- if (write_journal_header(jnl, 0, jnl->saved_sequence_num) != 0) {
- ret_val = -1;
- goto bad_journal;
- }
- /*
- * If the caller supplied a callback, call it now that the blocks have been
- * written to the journal. This is used by journal_relocate so, for example,
- * the file system can change its pointer to the new journal.
- */
- if (callback != NULL && callback(callback_arg) != 0) {
- ret_val = -1;
- goto bad_journal;
- }
-
- //
- // Send a DKIOCUNMAP for the extents trimmed by this transaction, and
- // free up the extent list.
- //
- journal_trim_flush(jnl, tr);
-
- // the buffer_flushed_callback will only be called for the
- // real blocks that get flushed so we have to account for
- // the block_list_headers here.
- //
- tr->num_flushed = tr->num_blhdrs * jnl->jhdr->blhdr_size;
-
- lock_condition(jnl, &jnl->asyncIO, "finish_end_transaction");
-
- //
- // setup for looping through all the blhdr's.
- //
- for (blhdr = tr->blhdr; blhdr; blhdr = next) {
- uint16_t num_blocks;
-
- /*
- * grab this info ahead of issuing the buf_bawrites...
- * once the last one goes out, its possible for blhdr
- * to be freed (especially if we get preempted) before
- * we do the last check of num_blocks or
- * grab the next blhdr pointer...
- */
- next = (block_list_header *)((long)blhdr->binfo[0].bnum);
- num_blocks = blhdr->num_blocks;
-
- /*
- * we can re-order the buf ptrs because everything is written out already
- */
- qsort(&blhdr->binfo[1], num_blocks-1, sizeof(block_info), journal_binfo_cmp);
-
- /*
- * need to make sure that the loop issuing the buf_bawrite's
- * does not touch blhdr once the last buf_bawrite has been
- * issued... at that point, we no longer have a legitmate
- * reference on the associated storage since it will be
- * released upon the completion of that last buf_bawrite
- */
- for (i = num_blocks-1; i >= 1; i--) {
- if (blhdr->binfo[i].bnum != (off_t)-1)
- break;
- num_blocks--;
- }
- for (i = 1; i < num_blocks; i++) {
-
- if ((bp = blhdr->binfo[i].u.bp)) {
- vp = buf_vnode(bp);
-
- buf_bawrite(bp);
-
- // this undoes the vnode_ref() in journal_modify_block_end()
- vnode_rele_ext(vp, 0, 1);
-
- bufs_written++;
- }
- }
- }
- if (bufs_written == 0) {
- /*
- * since we didn't issue any buf_bawrite's, there is no
- * async trigger to cause the memory associated with this
- * transaction to be freed... so, move it to the garbage
- * list now
- */
- lock_oldstart(jnl);
-
- tr->next = jnl->tr_freeme;
- jnl->tr_freeme = tr;
-
- unlock_oldstart(jnl);
-
- unlock_condition(jnl, &jnl->asyncIO);
- }
-
- //printf("jnl: end_tr: tr @ 0x%x, jnl-blocks: 0x%llx - 0x%llx. exit!\n",
- // tr, tr->journal_start, tr->journal_end);
-
-bad_journal:
- if (ret_val == -1) {
- abort_transaction(jnl, tr); // cleans up list of extents to be trimmed
-
- /*
- * 'flush_aborted' is protected by the flushing condition... we need to
- * set it before dropping the condition so that it will be
- * noticed in 'end_transaction'... we add this additional
- * aborted condition so that we can drop the 'flushing' condition
- * before grabbing the journal lock... this avoids a deadlock
- * in 'end_transaction' which is holding the journal lock while
- * waiting for the 'flushing' condition to clear...
- * everyone else will notice the JOURNAL_INVALID flag
- */
- jnl->flush_aborted = TRUE;
-
- unlock_condition(jnl, &jnl->flushing);
- journal_lock(jnl);
-
- jnl->flags |= JOURNAL_INVALID;
- jnl->old_start[sizeof(jnl->old_start)/sizeof(jnl->old_start[0]) - 1] &= ~0x8000000000000000LL;
-
- journal_unlock(jnl);
- } else
- unlock_condition(jnl, &jnl->flushing);
-
- if ((jnl->fsmount->mnt_kern_flag & MNTK_SWAP_MOUNT) && (was_vm_privileged == FALSE))
- set_vm_privilege(FALSE);
-
- KERNEL_DEBUG(0xbbbbc028|DBG_FUNC_END, jnl, tr, bufs_written, ret_val, 0);
-
- return (ret_val);
-}
-
-
-static void
-lock_condition(journal *jnl, boolean_t *condition, const char *condition_name)
-{
-
- KERNEL_DEBUG(0xbbbbc020|DBG_FUNC_START, jnl, condition, 0, 0, 0);
-
- lock_flush(jnl);
-
- while (*condition == TRUE)
- msleep(condition, &jnl->flock, PRIBIO, condition_name, NULL);
-
- *condition = TRUE;
- unlock_flush(jnl);
-
- KERNEL_DEBUG(0xbbbbc020|DBG_FUNC_END, jnl, condition, 0, 0, 0);
-}
-
-static void
-wait_condition(journal *jnl, boolean_t *condition, const char *condition_name)
-{
-
- if (*condition == FALSE)
- return;
-
- KERNEL_DEBUG(0xbbbbc02c|DBG_FUNC_START, jnl, condition, 0, 0, 0);
-
- lock_flush(jnl);
-
- while (*condition == TRUE)
- msleep(condition, &jnl->flock, PRIBIO, condition_name, NULL);
-
- unlock_flush(jnl);
-
- KERNEL_DEBUG(0xbbbbc02c|DBG_FUNC_END, jnl, condition, 0, 0, 0);
-}
-
-static void
-unlock_condition(journal *jnl, boolean_t *condition)
-{
- lock_flush(jnl);
-
- *condition = FALSE;
- wakeup(condition);
-
- unlock_flush(jnl);
-}
-
-static void
-abort_transaction(journal *jnl, transaction *tr)
-{
- block_list_header *blhdr, *next;
-
- // for each block list header, iterate over the blocks then
- // free up the memory associated with the block list.
- //
- // find each of the primary blocks (i.e. the list could
- // contain a mix of shadowed and real buf_t's depending
- // on when the abort condition was detected) and mark them
- // clean and locked in the cache... this at least allows
- // the FS a consistent view between it's incore data structures
- // and the meta-data held in the cache
- //
- KERNEL_DEBUG(0xbbbbc034|DBG_FUNC_START, jnl, tr, 0, 0, 0);
-
- for (blhdr = tr->blhdr; blhdr; blhdr = next) {
- int i;
-
- for (i = 1; i < blhdr->num_blocks; i++) {
- buf_t bp, tbp, sbp;
- vnode_t bp_vp;
- errno_t errno;
-
- if (blhdr->binfo[i].bnum == (off_t)-1)
- continue;
-
- tbp = blhdr->binfo[i].u.bp;
-
- bp_vp = buf_vnode(tbp);
-
- if (buf_shadow(tbp)) {
- sbp = tbp;
- buf_setfilter(tbp, NULL, NULL, NULL, NULL);
- } else {
- assert(ISSET(buf_flags(tbp), B_LOCKED));
-
- sbp = NULL;
-
- do {
- errno = buf_acquire(tbp, BAC_REMOVE, 0, 0);
- } while (errno == EAGAIN);
-
- if (!errno) {
- buf_setfilter(tbp, NULL, NULL, NULL, NULL);
- buf_brelse(tbp);
- }
- }
-
- if (bp_vp) {
- errno = buf_meta_bread(bp_vp,
- buf_lblkno(tbp),
- buf_size(tbp),
- NOCRED,
- &bp);
- if (errno == 0) {
- if (sbp == NULL && bp != tbp && (buf_flags(tbp) & B_LOCKED)) {
- panic("jnl: abort_tr: got back a different bp! (bp %p should be %p, jnl %p\n",
- bp, tbp, jnl);
- }
- /*
- * once the journal has been marked INVALID and aborted,
- * NO meta data can be written back to the disk, so
- * mark the buf_t clean and make sure it's locked in the cache
- * note: if we found a shadow, the real buf_t needs to be relocked
- */
- buf_setflags(bp, B_LOCKED);
- buf_markclean(bp);
- buf_brelse(bp);
-
- KERNEL_DEBUG(0xbbbbc034|DBG_FUNC_NONE, jnl, tr, bp, 0, 0);
-
- /*
- * this undoes the vnode_ref() in journal_modify_block_end()
- */
- vnode_rele_ext(bp_vp, 0, 1);
- } else {
- printf("jnl: %s: abort_tr: could not find block %lld for vnode!\n",
- jnl->jdev_name, blhdr->binfo[i].bnum);
- if (bp) {
- buf_brelse(bp);
- }
- }
- }
- if (sbp)
- buf_brelse(sbp);
- }
- next = (block_list_header *)((long)blhdr->binfo[0].bnum);
-
- // we can free blhdr here since we won't need it any more
- blhdr->binfo[0].bnum = 0xdeadc0de;
- kmem_free(kernel_map, (vm_offset_t)blhdr, tr->tbuffer_size);
- }
-
- /*
- * If the transaction we're aborting was the async transaction, then
- * tell the current transaction that there is no pending trim
- * any more.
- */
- lck_rw_lock_exclusive(&jnl->trim_lock);
- if (jnl->async_trim == &tr->trim)
- jnl->async_trim = NULL;
- lck_rw_unlock_exclusive(&jnl->trim_lock);
-
-
- if (tr->trim.extents) {
- kfree(tr->trim.extents, tr->trim.allocated_count * sizeof(dk_extent_t));
- }
- tr->trim.allocated_count = 0;
- tr->trim.extent_count = 0;
- tr->trim.extents = NULL;
- tr->tbuffer = NULL;
- tr->blhdr = NULL;
- tr->total_bytes = 0xdbadc0de;
- FREE_ZONE(tr, sizeof(transaction), M_JNL_TR);
-
- KERNEL_DEBUG(0xbbbbc034|DBG_FUNC_END, jnl, tr, 0, 0, 0);
-}
-
-
-int
-journal_end_transaction(journal *jnl)
-{
- int ret;
- transaction *tr;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- if ((jnl->flags & JOURNAL_INVALID) && jnl->owner == NULL) {
- return 0;
- }
-
- if (jnl->owner != current_thread()) {
- panic("jnl: end_tr: I'm not the owner! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
- jnl->nested_count--;
-
- if (jnl->nested_count > 0) {
- return 0;
- } else if (jnl->nested_count < 0) {
- panic("jnl: jnl @ %p has negative nested count (%d). bad boy.\n", jnl, jnl->nested_count);
- }
-
- if (jnl->flags & JOURNAL_INVALID) {
- if (jnl->active_tr) {
- if (jnl->cur_tr != NULL) {
- panic("jnl: journal @ %p has active tr (%p) and cur tr (%p)\n",
- jnl, jnl->active_tr, jnl->cur_tr);
- }
- tr = jnl->active_tr;
- jnl->active_tr = NULL;
-
- abort_transaction(jnl, tr);
- }
- journal_unlock(jnl);
-
- return EINVAL;
- }
-
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
-
- // clear this out here so that when check_free_space() calls
- // the FS flush function, we don't panic in journal_flush()
- // if the FS were to call that. note: check_free_space() is
- // called from end_transaction().
- //
- jnl->active_tr = NULL;
-
- /* Examine the force-journal-flush state in the active txn */
- if (tr->flush_on_completion == TRUE) {
- /*
- * If the FS requested it, disallow group commit and force the
- * transaction out to disk immediately.
- */
- ret = end_transaction(tr, 1, NULL, NULL, TRUE, TRUE);
- }
- else {
- /* in the common path we can simply use the double-buffered journal */
- ret = end_transaction(tr, 0, NULL, NULL, TRUE, FALSE);
- }
-
- return ret;
-}
-
-
-/*
- * Flush the contents of the journal to the disk.
- *
- * Input:
- * wait_for_IO -
- * If TRUE, wait to write in-memory journal to the disk
- * consistently, and also wait to write all asynchronous
- * metadata blocks to its corresponding locations
- * consistently on the disk. This means that the journal
- * is empty at this point and does not contain any
- * transactions. This is overkill in normal scenarios
- * but is useful whenever the metadata blocks are required
- * to be consistent on-disk instead of just the journal
- * being consistent; like before live verification
- * and live volume resizing.
- *
- * If FALSE, only wait to write in-memory journal to the
- * disk consistently. This means that the journal still
- * contains uncommitted transactions and the file system
- * metadata blocks in the journal transactions might be
- * written asynchronously to the disk. But there is no
- * guarantee that they are written to the disk before
- * returning to the caller. Note that this option is
- * sufficient for file system data integrity as it
- * guarantees consistent journal content on the disk.
- */
-int
-journal_flush(journal *jnl, journal_flush_options_t options)
-{
- boolean_t drop_lock = FALSE;
- errno_t error = 0;
- uint32_t flush_count;
-
- CHECK_JOURNAL(jnl);
-
- free_old_stuff(jnl);
-
- if (jnl->flags & JOURNAL_INVALID) {
- return -1;
- }
-
- KERNEL_DEBUG(DBG_JOURNAL_FLUSH | DBG_FUNC_START, jnl, 0, 0, 0, 0);
-
- if (jnl->owner != current_thread()) {
- journal_lock(jnl);
- drop_lock = TRUE;
- }
-
- if (ISSET(options, JOURNAL_FLUSH_FULL))
- flush_count = jnl->flush_counter;
-
- // if we're not active, flush any buffered transactions
- if (jnl->active_tr == NULL && jnl->cur_tr) {
- transaction *tr = jnl->cur_tr;
-
- jnl->cur_tr = NULL;
-
- if (ISSET(options, JOURNAL_WAIT_FOR_IO)) {
- wait_condition(jnl, &jnl->flushing, "journal_flush");
- wait_condition(jnl, &jnl->asyncIO, "journal_flush");
- }
- /*
- * "end_transction" will wait for any current async flush
- * to complete, before flushing "cur_tr"... because we've
- * specified the 'must_wait' arg as TRUE, it will then
- * synchronously flush the "cur_tr"
- */
- end_transaction(tr, 1, NULL, NULL, drop_lock, TRUE); // force it to get flushed
-
- } else {
- if (drop_lock == TRUE) {
- journal_unlock(jnl);
- }
-
- /* Because of pipelined journal, the journal transactions
- * might be in process of being flushed on another thread.
- * If there is nothing to flush currently, we should
- * synchronize ourselves with the pipelined journal thread
- * to ensure that all inflight transactions, if any, are
- * flushed before we return success to caller.
- */
- wait_condition(jnl, &jnl->flushing, "journal_flush");
- }
- if (ISSET(options, JOURNAL_WAIT_FOR_IO)) {
- wait_condition(jnl, &jnl->asyncIO, "journal_flush");
- }
-
- if (ISSET(options, JOURNAL_FLUSH_FULL)) {
-
- dk_synchronize_t sync_request = {
- .options = 0,
- };
-
- // We need a full cache flush. If it has not been done, do it here.
- if (flush_count == jnl->flush_counter)
- error = VNOP_IOCTL(jnl->jdev, DKIOCSYNCHRONIZE, (caddr_t)&sync_request, FWRITE, vfs_context_kernel());
-
- // If external journal partition is enabled, flush filesystem data partition.
- if (jnl->jdev != jnl->fsdev)
- error = VNOP_IOCTL(jnl->fsdev, DKIOCSYNCHRONIZE, (caddr_t)&sync_request, FWRITE, vfs_context_kernel());
-
- }
-
- KERNEL_DEBUG(DBG_JOURNAL_FLUSH | DBG_FUNC_END, jnl, 0, 0, 0, 0);
-
- return 0;
-}
-
-int
-journal_active(journal *jnl)
-{
- if (jnl->flags & JOURNAL_INVALID) {
- return -1;
- }
-
- return (jnl->active_tr == NULL) ? 0 : 1;
-}
-
-void *
-journal_owner(journal *jnl)
-{
- return jnl->owner;
-}
-
-int journal_uses_fua(journal *jnl)
-{
- if (jnl->flags & JOURNAL_DO_FUA_WRITES)
- return 1;
- return 0;
-}
-
-/*
- * Relocate the journal.
- *
- * You provide the new starting offset and size for the journal. You may
- * optionally provide a new tbuffer_size; passing zero defaults to not
- * changing the tbuffer size except as needed to fit within the new journal
- * size.
- *
- * You must have already started a transaction. The transaction may contain
- * modified blocks (such as those needed to deallocate the old journal,
- * allocate the new journal, and update the location and size of the journal
- * in filesystem-private structures). Any transactions prior to the active
- * transaction will be flushed to the old journal. The new journal will be
- * initialized, and the blocks from the active transaction will be written to
- * the new journal.
- *
- * The caller will need to update the structures that identify the location
- * and size of the journal. These updates should be made in the supplied
- * callback routine. These updates must NOT go into a transaction. You should
- * force these updates to the media before returning from the callback. In the
- * even of a crash, either the old journal will be found, with an empty journal,
- * or the new journal will be found with the contents of the active transaction.
- *
- * Upon return from the callback, the blocks from the active transaction are
- * written to their normal locations on disk.
- *
- * (Remember that we have to ensure that blocks get committed to the journal
- * before being committed to their normal locations. But the blocks don't count
- * as committed until the new journal is pointed at.)
- *
- * Upon return, there is still an active transaction: newly allocated, and
- * with no modified blocks. Call journal_end_transaction as normal. You may
- * modifiy additional blocks before calling journal_end_transaction, and those
- * blocks will (eventually) go to the relocated journal.
- *
- * Inputs:
- * jnl The (opened) journal to relocate.
- * offset The new journal byte offset (from start of the journal device).
- * journal_size The size, in bytes, of the new journal.
- * tbuffer_size The new desired transaction buffer size. Pass zero to keep
- * the same size as the current journal. The size will be
- * modified as needed to fit the new journal.
- * callback Routine called after the new journal has been initialized,
- * and the active transaction written to the new journal, but
- * before the blocks are written to their normal locations.
- * Pass NULL for no callback.
- * callback_arg An argument passed to the callback routine.
- *
- * Result:
- * 0 No errors
- * EINVAL The offset is not block aligned
- * EINVAL The journal_size is not a multiple of the block size
- * EINVAL The journal is invalid
- * (any) An error returned by journal_flush.
- *
- */
-int journal_relocate(journal *jnl, off_t offset, off_t journal_size, int32_t tbuffer_size,
- errno_t (*callback)(void *), void *callback_arg)
-{
- int ret;
- transaction *tr;
- size_t i = 0;
-
- /*
- * Sanity check inputs, and adjust the size of the transaction buffer.
- */
- if ((offset % jnl->jhdr->jhdr_size) != 0) {
- printf("jnl: %s: relocate: offset 0x%llx is not an even multiple of block size 0x%x\n",
- jnl->jdev_name, offset, jnl->jhdr->jhdr_size);
- return EINVAL;
- }
- if ((journal_size % jnl->jhdr->jhdr_size) != 0) {
- printf("jnl: %s: relocate: journal size 0x%llx is not an even multiple of block size 0x%x\n",
- jnl->jdev_name, journal_size, jnl->jhdr->jhdr_size);
- return EINVAL;
- }
-
- CHECK_JOURNAL(jnl);
-
- /* Guarantee we own the active transaction. */
- if (jnl->flags & JOURNAL_INVALID) {
- return EINVAL;
- }
- if (jnl->owner != current_thread()) {
- panic("jnl: relocate: Not the owner! jnl %p, owner %p, curact %p\n",
- jnl, jnl->owner, current_thread());
- }
-
- if (tbuffer_size == 0)
- tbuffer_size = jnl->tbuffer_size;
- size_up_tbuffer(jnl, tbuffer_size, jnl->jhdr->jhdr_size);
-
- /*
- * Flush any non-active transactions. We have to temporarily hide the
- * active transaction to make journal_flush flush out non-active but
- * current (unwritten) transactions.
- */
- tr = jnl->active_tr;
- CHECK_TRANSACTION(tr);
- jnl->active_tr = NULL;
- ret = journal_flush(jnl, JOURNAL_WAIT_FOR_IO);
- jnl->active_tr = tr;
-
- if (ret) {
- return ret;
- }
- wait_condition(jnl, &jnl->flushing, "end_transaction");
-
- /*
- * At this point, we have completely flushed the contents of the current
- * journal to disk (and have asynchronously written all of the txns to
- * their actual desired locations). As a result, we can (and must) clear
- * out the old_start array. If we do not, then if the last written transaction
- * started at the beginning of the journal (starting 1 block into the
- * journal file) it could confuse the buffer_flushed callback. This is
- * because we're about to reset the start/end pointers of the journal header
- * below.
- */
- lock_oldstart(jnl);
- for (i = 0; i < sizeof (jnl->old_start) / sizeof(jnl->old_start[0]); i++) {
- jnl->old_start[i] = 0;
- }
- unlock_oldstart(jnl);
-
- /* Update the journal's offset and size in memory. */
- jnl->jdev_offset = offset;
- jnl->jhdr->start = jnl->jhdr->end = jnl->jhdr->jhdr_size;
- jnl->jhdr->size = journal_size;
- jnl->active_start = jnl->jhdr->start;
-
- /*
- * Force the active transaction to be written to the new journal. Call the
- * supplied callback after the blocks have been written to the journal, but
- * before they get written to their normal on-disk locations.
- */
- jnl->active_tr = NULL;
- ret = end_transaction(tr, 1, callback, callback_arg, FALSE, TRUE);
- if (ret) {
- printf("jnl: %s: relocate: end_transaction failed (%d)\n", jnl->jdev_name, ret);
- goto bad_journal;
- }
-
- /*
- * Create a new, empty transaction to be the active transaction. This way
- * our caller can use journal_end_transaction as usual.
- */
- ret = journal_allocate_transaction(jnl);
- if (ret) {
- printf("jnl: %s: relocate: could not allocate new transaction (%d)\n", jnl->jdev_name, ret);
- goto bad_journal;
- }
-
- return 0;
-
-bad_journal:
- jnl->flags |= JOURNAL_INVALID;
- abort_transaction(jnl, tr);
- return ret;
-}
-
-uint32_t journal_current_txn(journal *jnl)
-{
- return jnl->sequence_num + (jnl->active_tr || jnl->cur_tr ? 0 : 1);
-}
-
-#else // !JOURNALING - so provide stub functions
-
-int journal_uses_fua(__unused journal *jnl)
-{
- return 0;
-}
-
-journal *
-journal_create(__unused struct vnode *jvp,
- __unused off_t offset,
- __unused off_t journal_size,
- __unused struct vnode *fsvp,
- __unused size_t min_fs_blksz,
- __unused int32_t flags,
- __unused int32_t tbuffer_size,
- __unused void (*flush)(void *arg),
- __unused void *arg,
- __unused struct mount *fsmount)
-{
- return NULL;
-}
-
-journal *
-journal_open(__unused struct vnode *jvp,
- __unused off_t offset,
- __unused off_t journal_size,
- __unused struct vnode *fsvp,
- __unused size_t min_fs_blksz,
- __unused int32_t flags,
- __unused int32_t tbuffer_size,
- __unused void (*flush)(void *arg),
- __unused void *arg,
- __unused struct mount *fsmount)
-{
- return NULL;
-}
-
-
-int
-journal_modify_block_start(__unused journal *jnl, __unused struct buf *bp)
-{
- return EINVAL;
-}
-
-int
-journal_modify_block_end(__unused journal *jnl,
- __unused struct buf *bp,
- __unused void (*func)(struct buf *bp, void *arg),
- __unused void *arg)
-{
- return EINVAL;
-}
-
-int
-journal_kill_block(__unused journal *jnl, __unused struct buf *bp)
-{
- return EINVAL;
-}
-
-int journal_relocate(__unused journal *jnl,
- __unused off_t offset,
- __unused off_t journal_size,
- __unused int32_t tbuffer_size,
- __unused errno_t (*callback)(void *),
- __unused void *callback_arg)
-{
- return EINVAL;
-}
-
-void
-journal_close(__unused journal *jnl)
-{
-}
-
-int
-journal_start_transaction(__unused journal *jnl)
-{
- return EINVAL;
-}
-
-int
-journal_end_transaction(__unused journal *jnl)
-{
- return EINVAL;
-}
-
-int
-journal_flush(__unused journal *jnl, __unused journal_flush_options_t options)
-{
- return EINVAL;
-}
-
-int
-journal_is_clean(__unused struct vnode *jvp,
- __unused off_t offset,
- __unused off_t journal_size,
- __unused struct vnode *fsvp,
- __unused size_t min_fs_block_size)
-{
- return 0;
-}
-
-
-void *
-journal_owner(__unused journal *jnl)
-{
- return NULL;
-}
-
-void
-journal_lock(__unused journal *jnl)
-{
- return;
-}
-
-void
-journal_unlock(__unused journal *jnl)
-{
- return;
-}
-
-__private_extern__ int
-journal_trim_add_extent(__unused journal *jnl,
- __unused uint64_t offset,
- __unused uint64_t length)
-{
- return 0;
-}
-
-int
-journal_request_immediate_flush(__unused journal *jnl)
-{
- return 0;
-}
-
-__private_extern__ int
-journal_trim_remove_extent(__unused journal *jnl,
- __unused uint64_t offset,
- __unused uint64_t length)
-{
- return 0;
-}
-
-int journal_trim_extent_overlap(__unused journal *jnl,
- __unused uint64_t offset,
- __unused uint64_t length,
- __unused uint64_t *end)
-{
- return 0;
-}
-
-#endif // !JOURNALING
projects / apple / xnu.git / blobdiff