X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/21362eb3e66fd2c787aee132bce100a44d71a99c..c6bf4f310a33a9262d455ea4d3f0630b1255e3fe:/bsd/vfs/vfs_fsevents.c
diff --git a/bsd/vfs/vfs_fsevents.c b/bsd/vfs/vfs_fsevents.c
index 109a8f72e..f7916db48 100644
--- a/bsd/vfs/vfs_fsevents.c
+++ b/bsd/vfs/vfs_fsevents.c
@@ -1,8 +1,8 @@
/*
- * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2004-2019 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
@@ -11,10 +11,10 @@
* 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,
@@ -22,12 +22,16 @@
* 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@
*/
#include <stdarg.h>
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/event.h> // for kqueue related stuff
+#include <sys/fsevents.h>
+
+#if CONFIG_FSE
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
@@ -47,67 +51,87 @@
#include <miscfs/specfs/specdev.h>
#include <miscfs/devfs/devfs.h>
#include <sys/filio.h>
-#include <architecture/byte_order.h>
#include <kern/locks.h>
#include <libkern/OSAtomic.h>
+#include <kern/zalloc.h>
+#include <mach/mach_time.h>
+#include <kern/thread_call.h>
+#include <kern/clock.h>
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <bsm/audit_kevents.h>
-// where all our structs and defines come from
-#include <sys/fsevents.h>
-
+#include <pexpert/pexpert.h>
+#include <libkern/section_keywords.h>
-typedef struct kfs_event_arg {
- u_int16_t type;
- u_int16_t len;
- union {
- struct vnode *vp;
- char *str;
- void *ptr;
- int32_t int32;
- dev_t dev;
- ino_t ino;
- int32_t mode;
- uid_t uid;
- gid_t gid;
- } data;
-}kfs_event_arg;
-
-#define KFS_NUM_ARGS FSE_MAX_ARGS
typedef struct kfs_event {
- int32_t type; // type code of this event
- u_int32_t refcount; // number of clients referencing this
- pid_t pid; // pid of the process that did the op
- kfs_event_arg args[KFS_NUM_ARGS];
+ LIST_ENTRY(kfs_event) kevent_list;
+ int16_t type; // type code of this event
+ u_int16_t flags, // per-event flags
+ len; // the length of the path in "str"
+ int32_t refcount; // number of clients referencing this
+ pid_t pid; // pid of the process that did the op
+
+ uint64_t abstime; // when this event happened (mach_absolute_time())
+ ino64_t ino;
+ dev_t dev;
+ int32_t mode;
+ uid_t uid;
+ gid_t gid;
+
+ const char *str;
+
+ struct kfs_event *dest; // if this is a two-file op
} kfs_event;
+// flags for the flags field
+#define KFSE_COMBINED_EVENTS 0x0001
+#define KFSE_CONTAINS_DROPPED_EVENTS 0x0002
+#define KFSE_RECYCLED_EVENT 0x0004
+#define KFSE_BEING_CREATED 0x0008
+
+LIST_HEAD(kfse_list, kfs_event) kfse_list_head = LIST_HEAD_INITIALIZER(x);
+int num_events_outstanding = 0;
+int num_pending_rename = 0;
+
+
+struct fsevent_handle;
typedef struct fs_event_watcher {
- SLIST_ENTRY(fs_event_watcher) link;
- int8_t *event_list; // the events we're interested in
- int32_t num_events;
- dev_t *devices_to_watch; // only report events from these devices
- uint32_t num_devices;
- int32_t flags;
- kfs_event **event_queue;
- int32_t eventq_size; // number of event pointers in queue
- int32_t rd, wr; // indices to the event_queue
- int32_t blockers;
+ int8_t *event_list; // the events we're interested in
+ int32_t num_events;
+ dev_t *devices_not_to_watch;// report events from devices not in this list
+ uint32_t num_devices;
+ int32_t flags;
+ kfs_event **event_queue;
+ int32_t eventq_size; // number of event pointers in queue
+ int32_t num_readers;
+ int32_t rd; // read index into the event_queue
+ int32_t wr; // write index into the event_queue
+ int32_t blockers;
+ int32_t my_id;
+ uint32_t num_dropped;
+ uint64_t max_event_id;
+ struct fsevent_handle *fseh;
+ pid_t pid;
+ char proc_name[(2 * MAXCOMLEN) + 1];
} fs_event_watcher;
// fs_event_watcher flags
-#define WATCHER_DROPPED_EVENTS 0x0001
-#define WATCHER_CLOSING 0x0002
-
-static SLIST_HEAD(watch_list, fs_event_watcher) watch_list_head = { NULL };
+#define WATCHER_DROPPED_EVENTS 0x0001
+#define WATCHER_CLOSING 0x0002
+#define WATCHER_WANTS_COMPACT_EVENTS 0x0004
+#define WATCHER_WANTS_EXTENDED_INFO 0x0008
+#define WATCHER_APPLE_SYSTEM_SERVICE 0x0010 // fseventsd, coreservicesd, mds, revisiond
+#define MAX_WATCHERS 8
+static fs_event_watcher *watcher_table[MAX_WATCHERS];
-#define MAX_KFS_EVENTS 2048
+#define DEFAULT_MAX_KFS_EVENTS 4096
+static int max_kfs_events = DEFAULT_MAX_KFS_EVENTS;
-// this array holds each pending event
-static kfs_event fs_event_buf[MAX_KFS_EVENTS];
-static int free_event_idx = 0;
+// we allocate kfs_event structures out of this zone
+static zone_t event_zone;
static int fs_event_init = 0;
//
@@ -117,7 +141,13 @@ static int fs_event_init = 0;
//
static int16_t fs_event_type_watchers[FSE_MAX_EVENTS];
+// the device currently being unmounted:
+static dev_t fsevent_unmount_dev = 0;
+// how many ACKs are still outstanding:
+static int fsevent_unmount_ack_count = 0;
+
static int watcher_add_event(fs_event_watcher *watcher, kfs_event *kfse);
+static void fsevents_wakeup(fs_event_watcher *watcher);
//
// Locks
@@ -128,1118 +158,2292 @@ static lck_grp_t * fsevent_mutex_group;
static lck_grp_t * fsevent_rw_group;
-static lck_rw_t fsevent_big_lock; // always grab this first
-static lck_mtx_t watch_list_lock;
+static lck_rw_t event_handling_lock; // handles locking for event manipulation and recycling
+static lck_mtx_t watch_table_lock;
static lck_mtx_t event_buf_lock;
+static lck_mtx_t event_writer_lock;
+
+/* Explicitly declare qsort so compiler doesn't complain */
+__private_extern__ void qsort(
+ void * array,
+ size_t nmembers,
+ size_t member_size,
+ int (*)(const void *, const void *));
+
+static int
+is_ignored_directory(const char *path)
+{
+ if (!path) {
+ return 0;
+ }
-static void init_pathbuff(void);
+#define IS_TLD(x) strnstr(__DECONST(char *, path), x, MAXPATHLEN)
+ if (IS_TLD("/.Spotlight-V100/") ||
+ IS_TLD("/.MobileBackups/") ||
+ IS_TLD("/Backups.backupdb/")) {
+ return 1;
+ }
+#undef IS_TLD
+ return 0;
+}
static void
fsevents_internal_init(void)
{
- int i;
-
- if (fs_event_init++ != 0) {
- return;
- }
+ int i;
+
+ if (fs_event_init++ != 0) {
+ return;
+ }
- for(i=0; i < FSE_MAX_EVENTS; i++) {
- fs_event_type_watchers[i] = 0;
- }
+ for (i = 0; i < FSE_MAX_EVENTS; i++) {
+ fs_event_type_watchers[i] = 0;
+ }
+
+ memset(watcher_table, 0, sizeof(watcher_table));
- for(i=0; i < MAX_KFS_EVENTS; i++) {
- fs_event_buf[i].type = FSE_INVALID;
- fs_event_buf[i].refcount = 0;
- }
+ fsevent_lock_attr = lck_attr_alloc_init();
+ fsevent_group_attr = lck_grp_attr_alloc_init();
+ fsevent_mutex_group = lck_grp_alloc_init("fsevent-mutex", fsevent_group_attr);
+ fsevent_rw_group = lck_grp_alloc_init("fsevent-rw", fsevent_group_attr);
- SLIST_INIT(&watch_list_head);
+ lck_mtx_init(&watch_table_lock, fsevent_mutex_group, fsevent_lock_attr);
+ lck_mtx_init(&event_buf_lock, fsevent_mutex_group, fsevent_lock_attr);
+ lck_mtx_init(&event_writer_lock, fsevent_mutex_group, fsevent_lock_attr);
- fsevent_lock_attr = lck_attr_alloc_init();
- fsevent_group_attr = lck_grp_attr_alloc_init();
- fsevent_mutex_group = lck_grp_alloc_init("fsevent-mutex", fsevent_group_attr);
- fsevent_rw_group = lck_grp_alloc_init("fsevent-rw", fsevent_group_attr);
+ lck_rw_init(&event_handling_lock, fsevent_rw_group, fsevent_lock_attr);
- lck_mtx_init(&watch_list_lock, fsevent_mutex_group, fsevent_lock_attr);
- lck_mtx_init(&event_buf_lock, fsevent_mutex_group, fsevent_lock_attr);
+ PE_get_default("kern.maxkfsevents", &max_kfs_events, sizeof(max_kfs_events));
+
+ event_zone = zinit(sizeof(kfs_event),
+ max_kfs_events * sizeof(kfs_event),
+ max_kfs_events * sizeof(kfs_event),
+ "fs-event-buf");
+ if (event_zone == NULL) {
+ printf("fsevents: failed to initialize the event zone.\n");
+ }
- lck_rw_init(&fsevent_big_lock, fsevent_rw_group, fsevent_lock_attr);
+ // mark the zone as exhaustible so that it will not
+ // ever grow beyond what we initially filled it with
+ zone_change(event_zone, Z_EXHAUST, TRUE);
+ zone_change(event_zone, Z_COLLECT, FALSE);
+ zone_change(event_zone, Z_CALLERACCT, FALSE);
- init_pathbuff();
+ if (zfill(event_zone, max_kfs_events) < max_kfs_events) {
+ printf("fsevents: failed to pre-fill the event zone.\n");
+ }
}
static void
-lock_watch_list(void)
+lock_watch_table(void)
{
- lck_mtx_lock(&watch_list_lock);
+ lck_mtx_lock(&watch_table_lock);
}
static void
-unlock_watch_list(void)
+unlock_watch_table(void)
{
- lck_mtx_unlock(&watch_list_lock);
+ lck_mtx_unlock(&watch_table_lock);
}
static void
-lock_fs_event_buf(void)
+lock_fs_event_list(void)
{
- lck_mtx_lock(&event_buf_lock);
+ lck_mtx_lock(&event_buf_lock);
}
static void
-unlock_fs_event_buf(void)
+unlock_fs_event_list(void)
{
- lck_mtx_unlock(&event_buf_lock);
+ lck_mtx_unlock(&event_buf_lock);
}
// forward prototype
-static void do_free_event(kfs_event *kfse);
+static void release_event_ref(kfs_event *kfse);
static int
watcher_cares_about_dev(fs_event_watcher *watcher, dev_t dev)
{
- unsigned int i;
-
- // if there is not list of devices to watch, then always
- // say we're interested so we'll report all events from
- // all devices
- if (watcher->devices_to_watch == NULL) {
- return 1;
- }
+ unsigned int i;
+
+ // if devices_not_to_watch is NULL then we care about all
+ // events from all devices
+ if (watcher->devices_not_to_watch == NULL) {
+ return 1;
+ }
- for(i=0; i < watcher->num_devices; i++) {
- if (dev == watcher->devices_to_watch[i]) {
- // found a match! that means we want events
- // from this device.
- return 1;
+ for (i = 0; i < watcher->num_devices; i++) {
+ if (dev == watcher->devices_not_to_watch[i]) {
+ // found a match! that means we do not
+ // want events from this device.
+ return 0;
+ }
}
- }
- // if we're here it's not in the devices_to_watch[]
- // list so that means we do not care about it
- return 0;
+ // if we're here it's not in the devices_not_to_watch[]
+ // list so that means we do care about it
+ return 1;
}
int
need_fsevent(int type, vnode_t vp)
{
- fs_event_watcher *watcher;
- dev_t dev;
-
- if (fs_event_type_watchers[type] == 0)
- return (0);
- dev = (dev_t)(vp->v_mount->mnt_vfsstat.f_fsid.val[0]);
+ if (type >= 0 && type < FSE_MAX_EVENTS && fs_event_type_watchers[type] == 0) {
+ return 0;
+ }
- lock_watch_list();
-
- SLIST_FOREACH(watcher, &watch_list_head, link) {
- if (watcher->event_list[type] == FSE_REPORT && watcher_cares_about_dev(watcher, dev)) {
- unlock_watch_list();
- return (1);
- }
+ // events in /dev aren't really interesting...
+ if (vp->v_tag == VT_DEVFS) {
+ return 0;
}
- unlock_watch_list();
-
- return (0);
+
+ return 1;
}
-int
-add_fsevent(int type, vfs_context_t ctx, ...)
-{
- struct proc *p = vfs_context_proc(ctx);
- int i, arg_idx, num_deliveries=0;
- kfs_event_arg *kea;
- kfs_event *kfse;
- fs_event_watcher *watcher;
- va_list ap;
- int error = 0;
- dev_t dev = 0;
-
- va_start(ap, ctx);
-
- // if no one cares about this type of event, bail out
- if (fs_event_type_watchers[type] == 0) {
- va_end(ap);
- return 0;
- }
+#define is_throw_away(x) ((x) == FSE_STAT_CHANGED || (x) == FSE_CONTENT_MODIFIED)
- lck_rw_lock_shared(&fsevent_big_lock);
- // find a free event and snag it for our use
- // NOTE: do not do anything that would block until
- // the lock is dropped.
- lock_fs_event_buf();
-
- for(i=0; i < MAX_KFS_EVENTS; i++) {
- if (fs_event_buf[(free_event_idx + i) % MAX_KFS_EVENTS].type == FSE_INVALID) {
- break;
- }
- }
+// Ways that an event can be reused:
+//
+// "combined" events mean that there were two events for
+// the same vnode or path and we're combining both events
+// into a single event. The primary event gets a bit that
+// marks it as having been combined. The secondary event
+// is essentially dropped and the kfse structure reused.
+//
+// "collapsed" means that multiple events below a given
+// directory are collapsed into a single event. in this
+// case, the directory that we collapse into and all of
+// its children must be re-scanned.
+//
+// "recycled" means that we're completely blowing away
+// the event since there are other events that have info
+// about the same vnode or path (and one of those other
+// events will be marked as combined or collapsed as
+// appropriate).
+//
+#define KFSE_COMBINED 0x0001
+#define KFSE_COLLAPSED 0x0002
+#define KFSE_RECYCLED 0x0004
- if (i >= MAX_KFS_EVENTS) {
- // yikes! no free slots
- unlock_fs_event_buf();
- va_end(ap);
+int num_dropped = 0;
+int num_parent_switch = 0;
+int num_recycled_rename = 0;
- lock_watch_list();
- SLIST_FOREACH(watcher, &watch_list_head, link) {
- watcher->flags |= WATCHER_DROPPED_EVENTS;
- wakeup((caddr_t)watcher);
- }
- unlock_watch_list();
- lck_rw_done(&fsevent_big_lock);
-
- printf("fs_events: add_event: event queue is full! dropping events.\n");
- return ENOSPC;
- }
-
- kfse = &fs_event_buf[(free_event_idx + i) % MAX_KFS_EVENTS];
-
- free_event_idx++;
-
- kfse->type = type;
- kfse->refcount = 0;
- kfse->pid = p->p_pid;
-
- unlock_fs_event_buf(); // at this point it's safe to unlock
-
- //
- // now process the arguments passed in and copy them into
- // the kfse
- //
- arg_idx = 0;
- while(arg_idx < KFS_NUM_ARGS) {
- kea = &kfse->args[arg_idx++];
- kea->type = va_arg(ap, int32_t);
-
- if (kea->type == FSE_ARG_DONE) {
- break;
- }
-
- switch(kea->type) {
- case FSE_ARG_VNODE: {
- // this expands out into multiple arguments to the client
- struct vnode *vp;
- struct vnode_attr va;
-
- kea->data.vp = vp = va_arg(ap, struct vnode *);
- if (kea->data.vp == NULL) {
- panic("add_fsevent: you can't pass me a NULL vnode ptr (type %d)!\n",
- kfse->type);
- }
-
- if (vnode_ref_ext(kea->data.vp, O_EVTONLY) != 0) {
- kea->type = FSE_ARG_DONE;
-
- error = EINVAL;
- goto clean_up;
- }
- VATTR_INIT(&va);
- VATTR_WANTED(&va, va_fsid);
- VATTR_WANTED(&va, va_fileid);
- VATTR_WANTED(&va, va_mode);
- VATTR_WANTED(&va, va_uid);
- VATTR_WANTED(&va, va_gid);
- if (vnode_getattr(kea->data.vp, &va, ctx) != 0) {
- vnode_rele_ext(kea->data.vp, O_EVTONLY, 0);
- kea->type = FSE_ARG_DONE;
-
- error = EINVAL;
- goto clean_up;
- }
-
- kea++;
- kea->type = FSE_ARG_DEV;
- kea->data.dev = dev = (dev_t)va.va_fsid;
-
- kea++;
- kea->type = FSE_ARG_INO;
- kea->data.ino = (ino_t)va.va_fileid;
-
- kea++;
- kea->type = FSE_ARG_MODE;
- kea->data.mode = (int32_t)vnode_vttoif(vnode_vtype(vp)) | va.va_mode;
-
- kea++;
- kea->type = FSE_ARG_UID;
- kea->data.uid = va.va_uid;
-
- kea++;
- kea->type = FSE_ARG_GID;
- kea->data.gid = va.va_gid;
- arg_idx += 5;
- break;
- }
-
- case FSE_ARG_FINFO: {
- fse_info *fse;
-
- fse = va_arg(ap, fse_info *);
-
- kea->type = FSE_ARG_DEV;
- kea->data.dev = dev = (dev_t)fse->dev;
-
- kea++;
- kea->type = FSE_ARG_INO;
- kea->data.ino = (ino_t)fse->ino;
-
- kea++;
- kea->type = FSE_ARG_MODE;
- kea->data.mode = (int32_t)fse->mode;
-
- kea++;
- kea->type = FSE_ARG_UID;
- kea->data.uid = (uid_t)fse->uid;
-
- kea++;
- kea->type = FSE_ARG_GID;
- kea->data.gid = (uid_t)fse->gid;
- arg_idx += 4;
- break;
- }
+static struct timeval last_print;
- case FSE_ARG_STRING:
- kea->len = (int16_t)(va_arg(ap, int32_t) & 0xffff);
- kea->data.str = vfs_addname(va_arg(ap, char *), kea->len, 0, 0);
- break;
+//
+// These variables are used to track coalescing multiple identical
+// events for the same vnode/pathname. If we get the same event
+// type and same vnode/pathname as the previous event, we just drop
+// the event since it's superfluous. This improves some micro-
+// benchmarks considerably and actually has a real-world impact on
+// tests like a Finder copy where multiple stat-changed events can
+// get coalesced.
+//
+static int last_event_type = -1;
+static void *last_ptr = NULL;
+static char last_str[MAXPATHLEN];
+static int last_nlen = 0;
+static int last_vid = -1;
+static uint64_t last_coalesced_time = 0;
+static void *last_event_ptr = NULL;
+int last_coalesced = 0;
+static mach_timebase_info_data_t sTimebaseInfo = { 0, 0 };
- case FSE_ARG_INT32:
- kea->data.int32 = va_arg(ap, int32_t);
- break;
- case FSE_ARG_INT64:
- printf("fs_events: 64-bit args not implemented.\n");
-// kea->data.int64 = va_arg(ap, int64_t);
- break;
+int
+add_fsevent(int type, vfs_context_t ctx, ...)
+{
+ struct proc *p = vfs_context_proc(ctx);
+ int i, arg_type, ret;
+ kfs_event *kfse, *kfse_dest = NULL, *cur;
+ fs_event_watcher *watcher;
+ va_list ap;
+ int error = 0, did_alloc = 0;
+ dev_t dev = 0;
+ uint64_t now, elapsed;
+ char *pathbuff = NULL;
+ int pathbuff_len;
- case FSE_ARG_RAW:
- kea->len = (int16_t)(va_arg(ap, int32_t) & 0xffff);
- MALLOC(kea->data.ptr, void *, kea->len, M_TEMP, M_WAITOK);
- memcpy(kea->data.ptr, va_arg(ap, void *), kea->len);
- break;
- case FSE_ARG_DEV:
- kea->data.dev = dev = va_arg(ap, dev_t);
- break;
-
- case FSE_ARG_MODE:
- kea->data.mode = va_arg(ap, int32_t);
- break;
-
- case FSE_ARG_INO:
- kea->data.ino = va_arg(ap, ino_t);
- break;
-
- case FSE_ARG_UID:
- kea->data.uid = va_arg(ap, uid_t);
- break;
-
- case FSE_ARG_GID:
- kea->data.gid = va_arg(ap, gid_t);
- break;
-
- default:
- printf("add_fsevent: unknown type %d\n", kea->type);
- // just skip one 32-bit word and hope we sync up...
- (void)va_arg(ap, int32_t);
- }
- }
-
- va_end(ap);
-
- //
- // now we have to go and let everyone know that
- // is interested in this type of event...
- //
- lock_watch_list();
-
- SLIST_FOREACH(watcher, &watch_list_head, link) {
- if (watcher->event_list[type] == FSE_REPORT && watcher_cares_about_dev(watcher, dev)) {
- if (watcher_add_event(watcher, kfse) == 0) {
- num_deliveries++;
- }
- }
- }
-
- unlock_watch_list();
-
- clean_up:
- // just in case no one was interested after all...
- if (num_deliveries == 0) {
- do_free_event(kfse);
- free_event_idx = (int)(kfse - &fs_event_buf[0]);
- }
-
- lck_rw_done(&fsevent_big_lock);
- return error;
-}
-static void
-do_free_event(kfs_event *kfse)
-{
- int i;
- kfs_event_arg *kea, all_args[KFS_NUM_ARGS];
-
- lock_fs_event_buf();
-
- // mark this fsevent as invalid
- kfse->type = FSE_INVALID;
-
- // make a copy of this so we can free things without
- // holding the fs_event_buf lock
- //
- memcpy(&all_args[0], &kfse->args[0], sizeof(all_args));
-
- // and just to be anal, set this so that there are no args
- kfse->args[0].type = FSE_ARG_DONE;
-
- free_event_idx = (kfse - fs_event_buf);
-
- unlock_fs_event_buf();
-
- for(i=0; i < KFS_NUM_ARGS; i++) {
- kea = &all_args[i];
- if (kea->type == FSE_ARG_DONE) {
- break;
- }
-
- switch(kea->type) {
- case FSE_ARG_VNODE:
- vnode_rele_ext(kea->data.vp, O_EVTONLY, 0);
- break;
- case FSE_ARG_STRING:
- vfs_removename(kea->data.str);
- break;
- case FSE_ARG_RAW:
- FREE(kea->data.ptr, M_TEMP);
- break;
+ va_start(ap, ctx);
+
+ // ignore bogus event types..
+ if (type < 0 || type >= FSE_MAX_EVENTS) {
+ return EINVAL;
}
- }
-}
+ // if no one cares about this type of event, bail out
+ if (fs_event_type_watchers[type] == 0) {
+ va_end(ap);
-static int
-add_watcher(int8_t *event_list, int32_t num_events, int32_t eventq_size, fs_event_watcher **watcher_out)
-{
- int i;
- fs_event_watcher *watcher;
+ return 0;
+ }
- if (eventq_size < 0 || eventq_size > MAX_KFS_EVENTS) {
- eventq_size = MAX_KFS_EVENTS;
- }
+ now = mach_absolute_time();
+
+ // find a free event and snag it for our use
+ // NOTE: do not do anything that would block until
+ // the lock is dropped.
+ lock_fs_event_list();
+
+ //
+ // check if this event is identical to the previous one...
+ // (as long as it's not an event type that can never be the
+ // same as a previous event)
+ //
+ if (type != FSE_CREATE_FILE && type != FSE_DELETE && type != FSE_RENAME && type != FSE_EXCHANGE && type != FSE_CHOWN && type != FSE_DOCID_CHANGED && type != FSE_DOCID_CREATED && type != FSE_CLONE) {
+ void *ptr = NULL;
+ int vid = 0, was_str = 0, nlen = 0;
+
+ for (arg_type = va_arg(ap, int32_t); arg_type != FSE_ARG_DONE; arg_type = va_arg(ap, int32_t)) {
+ switch (arg_type) {
+ case FSE_ARG_VNODE: {
+ ptr = va_arg(ap, void *);
+ vid = vnode_vid((struct vnode *)ptr);
+ last_str[0] = '\0';
+ break;
+ }
+ case FSE_ARG_STRING: {
+ nlen = va_arg(ap, int32_t);
+ ptr = va_arg(ap, void *);
+ was_str = 1;
+ break;
+ }
+ }
+ if (ptr != NULL) {
+ break;
+ }
+ }
+
+ if (sTimebaseInfo.denom == 0) {
+ (void) clock_timebase_info(&sTimebaseInfo);
+ }
- // Note: the event_queue follows the fs_event_watcher struct
- // in memory so we only have to do one allocation
- MALLOC(watcher,
- fs_event_watcher *,
- sizeof(fs_event_watcher) + eventq_size * sizeof(kfs_event *),
- M_TEMP, M_WAITOK);
+ elapsed = (now - last_coalesced_time);
+ if (sTimebaseInfo.denom != sTimebaseInfo.numer) {
+ if (sTimebaseInfo.denom == 1) {
+ elapsed *= sTimebaseInfo.numer;
+ } else {
+ // this could overflow... the worst that will happen is that we'll
+ // send (or not send) an extra event so I'm not going to worry about
+ // doing the math right like dtrace_abs_to_nano() does.
+ elapsed = (elapsed * sTimebaseInfo.numer) / (uint64_t)sTimebaseInfo.denom;
+ }
+ }
- watcher->event_list = event_list;
- watcher->num_events = num_events;
- watcher->devices_to_watch = NULL;
- watcher->num_devices = 0;
- watcher->flags = 0;
- watcher->event_queue = (kfs_event **)&watcher[1];
- watcher->eventq_size = eventq_size;
- watcher->rd = 0;
- watcher->wr = 0;
- watcher->blockers = 0;
+ if (type == last_event_type
+ && (elapsed < 1000000000)
+ &&
+ ((vid && vid == last_vid && last_ptr == ptr)
+ ||
+ (last_str[0] && last_nlen == nlen && ptr && strcmp(last_str, ptr) == 0))
+ ) {
+ last_coalesced++;
+ unlock_fs_event_list();
+ va_end(ap);
+
+ return 0;
+ } else {
+ last_ptr = ptr;
+ if (was_str) {
+ strlcpy(last_str, ptr, sizeof(last_str));
+ }
+ last_nlen = nlen;
+ last_vid = vid;
+ last_event_type = type;
+ last_coalesced_time = now;
+ }
+ }
+ va_start(ap, ctx);
- lock_watch_list();
- // now update the global list of who's interested in
- // events of a particular type...
- for(i=0; i < num_events; i++) {
- if (event_list[i] != FSE_IGNORE && i < FSE_MAX_EVENTS) {
- fs_event_type_watchers[i]++;
+ kfse = zalloc_noblock(event_zone);
+ if (kfse && (type == FSE_RENAME || type == FSE_EXCHANGE || type == FSE_CLONE)) {
+ kfse_dest = zalloc_noblock(event_zone);
+ if (kfse_dest == NULL) {
+ did_alloc = 1;
+ zfree(event_zone, kfse);
+ kfse = NULL;
+ }
}
- }
- SLIST_INSERT_HEAD(&watch_list_head, watcher, link);
- unlock_watch_list();
+ if (kfse == NULL) { // yikes! no free events
+ unlock_fs_event_list();
+ lock_watch_table();
- *watcher_out = watcher;
+ for (i = 0; i < MAX_WATCHERS; i++) {
+ watcher = watcher_table[i];
+ if (watcher == NULL) {
+ continue;
+ }
- return 0;
-}
+ watcher->flags |= WATCHER_DROPPED_EVENTS;
+ fsevents_wakeup(watcher);
+ }
+ unlock_watch_table();
+
+ {
+ struct timeval current_tv;
+
+ num_dropped++;
+
+ // only print a message at most once every 5 seconds
+ microuptime(¤t_tv);
+ if ((current_tv.tv_sec - last_print.tv_sec) > 10) {
+ int ii;
+ void *junkptr = zalloc_noblock(event_zone), *listhead = kfse_list_head.lh_first;
+
+ printf("add_fsevent: event queue is full! dropping events (num dropped events: %d; num events outstanding: %d).\n", num_dropped, num_events_outstanding);
+ printf("add_fsevent: kfse_list head %p ; num_pending_rename %d\n", listhead, num_pending_rename);
+ printf("add_fsevent: zalloc sez: %p\n", junkptr);
+ printf("add_fsevent: event_zone info: %d 0x%x\n", ((int *)event_zone)[0], ((int *)event_zone)[1]);
+ lock_watch_table();
+ for (ii = 0; ii < MAX_WATCHERS; ii++) {
+ if (watcher_table[ii] == NULL) {
+ continue;
+ }
+
+ printf("add_fsevent: watcher %s %p: rd %4d wr %4d q_size %4d flags 0x%x\n",
+ watcher_table[ii]->proc_name,
+ watcher_table[ii],
+ watcher_table[ii]->rd, watcher_table[ii]->wr,
+ watcher_table[ii]->eventq_size, watcher_table[ii]->flags);
+ }
+ unlock_watch_table();
+
+ last_print = current_tv;
+ if (junkptr) {
+ zfree(event_zone, junkptr);
+ }
+ }
+ }
-static void
-remove_watcher(fs_event_watcher *target)
-{
- int i;
- fs_event_watcher *watcher;
- kfs_event *kfse;
-
- lck_rw_lock_shared(&fsevent_big_lock);
-
- lock_watch_list();
-
- SLIST_FOREACH(watcher, &watch_list_head, link) {
- if (watcher == target) {
- SLIST_REMOVE(&watch_list_head, watcher, fs_event_watcher, link);
-
- for(i=0; i < watcher->num_events; i++) {
- if (watcher->event_list[i] != FSE_IGNORE && i < FSE_MAX_EVENTS) {
- fs_event_type_watchers[i]--;
- }
- }
-
- unlock_watch_list();
-
- // drain the event_queue
- for(i=watcher->rd; i != watcher->wr; i=(i+1) % watcher->eventq_size) {
- kfse = watcher->event_queue[i];
-
- if (OSAddAtomic(-1, (SInt32 *)&kfse->refcount) == 1) {
- do_free_event(kfse);
- }
- }
-
- if (watcher->event_list) {
- FREE(watcher->event_list, M_TEMP);
- watcher->event_list = NULL;
- }
- if (watcher->devices_to_watch) {
- FREE(watcher->devices_to_watch, M_TEMP);
- watcher->devices_to_watch = NULL;
- }
- FREE(watcher, M_TEMP);
-
- lck_rw_done(&fsevent_big_lock);
- return;
- }
- }
-
- unlock_watch_list();
- lck_rw_done(&fsevent_big_lock);
-}
+ if (pathbuff) {
+ release_pathbuff(pathbuff);
+ pathbuff = NULL;
+ }
+ return ENOSPC;
+ }
+ memset(kfse, 0, sizeof(kfs_event));
+ kfse->refcount = 1;
+ OSBitOrAtomic16(KFSE_BEING_CREATED, &kfse->flags);
+
+ last_event_ptr = kfse;
+ kfse->type = type;
+ kfse->abstime = now;
+ kfse->pid = p->p_pid;
+ if (type == FSE_RENAME || type == FSE_EXCHANGE || type == FSE_CLONE) {
+ memset(kfse_dest, 0, sizeof(kfs_event));
+ kfse_dest->refcount = 1;
+ OSBitOrAtomic16(KFSE_BEING_CREATED, &kfse_dest->flags);
+ kfse_dest->type = type;
+ kfse_dest->pid = p->p_pid;
+ kfse_dest->abstime = now;
+
+ kfse->dest = kfse_dest;
+ }
-static int
-watcher_add_event(fs_event_watcher *watcher, kfs_event *kfse)
-{
- if (((watcher->wr + 1) % watcher->eventq_size) == watcher->rd) {
- watcher->flags |= WATCHER_DROPPED_EVENTS;
- wakeup((caddr_t)watcher);
- return ENOSPC;
- }
+ num_events_outstanding++;
+ if (kfse->type == FSE_RENAME) {
+ num_pending_rename++;
+ }
+ LIST_INSERT_HEAD(&kfse_list_head, kfse, kevent_list);
- watcher->event_queue[watcher->wr] = kfse;
- OSAddAtomic(1, (SInt32 *)&kfse->refcount);
- watcher->wr = (watcher->wr + 1) % watcher->eventq_size;
-
- // wake up the watcher if he's waiting!
- wakeup((caddr_t)watcher);
+ if (kfse->refcount < 1) {
+ panic("add_fsevent: line %d: kfse recount %d but should be at least 1\n", __LINE__, kfse->refcount);
+ }
- return 0;
-}
+ unlock_fs_event_list(); // at this point it's safe to unlock
+ //
+ // now process the arguments passed in and copy them into
+ // the kfse
+ //
-static int
-fmod_watch(fs_event_watcher *watcher, struct uio *uio)
-{
- int i, error=0, last_full_event_resid;
- kfs_event *kfse;
- kfs_event_arg *kea;
- uint16_t tmp16;
+ cur = kfse;
- // LP64todo - fix this
- last_full_event_resid = uio_resid(uio);
+ if (type == FSE_DOCID_CREATED || type == FSE_DOCID_CHANGED) {
+ uint64_t val;
- // need at least 2048 bytes of space (maxpathlen + 1 event buf)
- if (uio_resid(uio) < 2048 || watcher == NULL) {
- return EINVAL;
- }
+ //
+ // These events are special and not like the other events. They only
+ // have a dev_t, src inode #, dest inode #, and a doc-id. We use the
+ // fields that we can in the kfse but have to overlay the dest inode
+ // number and the doc-id on the other fields.
+ //
+ // First the dev_t
+ arg_type = va_arg(ap, int32_t);
+ if (arg_type == FSE_ARG_DEV) {
+ cur->dev = (dev_t)(va_arg(ap, dev_t));
+ } else {
+ cur->dev = (dev_t)0xbadc0de1;
+ }
- if (watcher->rd == watcher->wr) {
- if (watcher->flags & WATCHER_CLOSING) {
- return 0;
- }
- OSAddAtomic(1, (SInt32 *)&watcher->blockers);
-
- // there's nothing to do, go to sleep
- error = tsleep((caddr_t)watcher, PUSER|PCATCH, "fsevents_empty", 0);
-
- OSAddAtomic(-1, (SInt32 *)&watcher->blockers);
-
- if (error != 0 || (watcher->flags & WATCHER_CLOSING)) {
- return error;
- }
- }
-
- // if we dropped events, return that as an event first
- if (watcher->flags & WATCHER_DROPPED_EVENTS) {
- int32_t val = FSE_EVENTS_DROPPED;
-
- error = uiomove((caddr_t)&val, sizeof(int32_t), uio);
- if (error == 0) {
- val = 0; // a fake pid
- error = uiomove((caddr_t)&val, sizeof(int32_t), uio);
-
- tmp16 = FSE_ARG_DONE; // makes it a consistent msg
- error = uiomove((caddr_t)&tmp16, sizeof(int16_t), uio);
- }
-
- if (error) {
- return error;
- }
-
- watcher->flags &= ~WATCHER_DROPPED_EVENTS;
- }
-
-// check if the next chunk of data will fit in the user's
-// buffer. if not, just goto get_out which will return
-// the number of bytes worth of events that we did read.
-// this leaves the event that didn't fit in the queue.
-//
- // LP64todo - fix this
-#define CHECK_UPTR(size) if (size > (unsigned)uio_resid(uio)) { \
- uio_setresid(uio, last_full_event_resid); \
- goto get_out; \
- }
-
- for (; uio_resid(uio) > 0 && watcher->rd != watcher->wr; ) {
- kfse = watcher->event_queue[watcher->rd];
+ // next the source inode #
+ arg_type = va_arg(ap, int32_t);
+ if (arg_type == FSE_ARG_INO) {
+ cur->ino = (ino64_t)(va_arg(ap, ino64_t));
+ } else {
+ cur->ino = 0xbadc0de2;
+ }
- // copy out the type of the event
- CHECK_UPTR(sizeof(int32_t));
- if ((error = uiomove((caddr_t)&kfse->type, sizeof(int32_t), uio)) != 0) {
- goto get_out;
- }
+ // now the dest inode #
+ arg_type = va_arg(ap, int32_t);
+ if (arg_type == FSE_ARG_INO) {
+ val = (ino64_t)(va_arg(ap, ino64_t));
+ } else {
+ val = 0xbadc0de2;
+ }
+ // overlay the dest inode number on the str/dest pointer fields
+ __nochk_memcpy(&cur->str, &val, sizeof(ino64_t));
+
+
+ // and last the document-id
+ arg_type = va_arg(ap, int32_t);
+ if (arg_type == FSE_ARG_INT32) {
+ val = (uint64_t)va_arg(ap, uint32_t);
+ } else if (arg_type == FSE_ARG_INT64) {
+ val = (uint64_t)va_arg(ap, uint64_t);
+ } else {
+ val = 0xbadc0de3;
+ }
+
+ // the docid is 64-bit and overlays the uid/gid fields
+ static_assert(sizeof(cur->uid) + sizeof(cur->gid) == sizeof(val), "gid/uid size mismatch");
+ static_assert(offsetof(struct kfs_event, gid) - offsetof(struct kfs_event, uid) == sizeof(cur->uid), "unexpected struct kfs_event layout");
+ memcpy(&cur->uid, &val, sizeof(cur->uid));
+ memcpy(&cur->gid, (u_int8_t *)&val + sizeof(cur->uid), sizeof(cur->gid));
- // now copy out the pid of the person that changed the file
- CHECK_UPTR(sizeof(pid_t));
- if ((error = uiomove((caddr_t)&kfse->pid, sizeof(pid_t), uio)) != 0) {
- goto get_out;
+ goto done_with_args;
}
- error = 0;
- for(i=0; i < KFS_NUM_ARGS && error == 0; i++) {
- char *pathbuff;
- int pathbuff_len;
+ if (type == FSE_UNMOUNT_PENDING) {
+ // Just a dev_t
+ arg_type = va_arg(ap, int32_t);
+ if (arg_type == FSE_ARG_DEV) {
+ cur->dev = (dev_t)(va_arg(ap, dev_t));
+ } else {
+ cur->dev = (dev_t)0xbadc0de1;
+ }
+
+ goto done_with_args;
+ }
- kea = &kfse->args[i];
+ for (arg_type = va_arg(ap, int32_t); arg_type != FSE_ARG_DONE; arg_type = va_arg(ap, int32_t)) {
+ switch (arg_type) {
+ case FSE_ARG_VNODE: {
+ // this expands out into multiple arguments to the client
+ struct vnode *vp;
+ struct vnode_attr va;
+
+ if (kfse->str != NULL) {
+ cur = kfse_dest;
+ }
+
+ vp = va_arg(ap, struct vnode *);
+ if (vp == NULL) {
+ panic("add_fsevent: you can't pass me a NULL vnode ptr (type %d)!\n",
+ cur->type);
+ }
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_fsid);
+ VATTR_WANTED(&va, va_fileid);
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_nlink);
+ if ((ret = vnode_getattr(vp, &va, vfs_context_kernel())) != 0) {
+ // printf("add_fsevent: failed to getattr on vp %p (%d)\n", cur->fref.vp, ret);
+ cur->str = NULL;
+ error = EINVAL;
+ goto clean_up;
+ }
+
+ cur->dev = dev = (dev_t)va.va_fsid;
+ cur->ino = (ino64_t)va.va_fileid;
+ cur->mode = (int32_t)vnode_vttoif(vnode_vtype(vp)) | va.va_mode;
+ cur->uid = va.va_uid;
+ cur->gid = va.va_gid;
+ if (vp->v_flag & VISHARDLINK) {
+ cur->mode |= FSE_MODE_HLINK;
+ if ((vp->v_type == VDIR && va.va_dirlinkcount == 0) || (vp->v_type == VREG && va.va_nlink == 0)) {
+ cur->mode |= FSE_MODE_LAST_HLINK;
+ }
+ }
+
+ // if we haven't gotten the path yet, get it.
+ if (pathbuff == NULL) {
+ pathbuff = get_pathbuff();
+ pathbuff_len = MAXPATHLEN;
+
+ pathbuff[0] = '\0';
+ if ((ret = vn_getpath_no_firmlink(vp, pathbuff, &pathbuff_len)) != 0 || pathbuff[0] == '\0') {
+ cur->flags |= KFSE_CONTAINS_DROPPED_EVENTS;
+
+ do {
+ if (vp->v_parent != NULL) {
+ vp = vp->v_parent;
+ } else if (vp->v_mount) {
+ strlcpy(pathbuff, vp->v_mount->mnt_vfsstat.f_mntonname, MAXPATHLEN);
+ break;
+ } else {
+ vp = NULL;
+ }
+
+ if (vp == NULL) {
+ break;
+ }
+
+ pathbuff_len = MAXPATHLEN;
+ ret = vn_getpath_no_firmlink(vp, pathbuff, &pathbuff_len);
+ } while (ret == ENOSPC);
+
+ if (ret != 0 || vp == NULL) {
+ error = ENOENT;
+ goto clean_up;
+ }
+ }
+ }
+
+ // store the path by adding it to the global string table
+ cur->len = pathbuff_len;
+ cur->str = vfs_addname(pathbuff, pathbuff_len, 0, 0);
+ if (cur->str == NULL || cur->str[0] == '\0') {
+ panic("add_fsevent: was not able to add path %s to event %p.\n", pathbuff, cur);
+ }
- tmp16 = (uint16_t)kea->type;
- CHECK_UPTR(sizeof(uint16_t));
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- if (error || kea->type == FSE_ARG_DONE) {
- break;
- }
-
- switch(kea->type) {
- case FSE_ARG_VNODE:
- pathbuff = get_pathbuff();
- pathbuff_len = MAXPATHLEN;
- if (kea->data.vp == NULL) {
- printf("fmod_watch: whoa... vp == NULL (%d)!\n", kfse->type);
- i--;
release_pathbuff(pathbuff);
- continue;
- }
-
- if (vn_getpath(kea->data.vp, pathbuff, &pathbuff_len) != 0 || pathbuff[0] == '\0') {
-// printf("fmod_watch: vn_getpath failed! vp 0x%x vname 0x%x (%s) vparent 0x%x\n",
-// kea->data.vp,
-// VNAME(kea->data.vp),
-// VNAME(kea->data.vp) ? VNAME(kea->data.vp) : "<null>",
-// VPARENT(kea->data.vp));
- }
- CHECK_UPTR(sizeof(uint16_t));
- tmp16 = (uint16_t)pathbuff_len;
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
-
- CHECK_UPTR((unsigned)pathbuff_len);
- error = uiomove((caddr_t)pathbuff, pathbuff_len, uio);
- release_pathbuff(pathbuff);
- break;
-
+ pathbuff = NULL;
+
+ break;
+ }
+
+ case FSE_ARG_FINFO: {
+ fse_info *fse;
+
+ fse = va_arg(ap, fse_info *);
+
+ cur->dev = dev = (dev_t)fse->dev;
+ cur->ino = (ino64_t)fse->ino;
+ cur->mode = (int32_t)fse->mode;
+ cur->uid = (uid_t)fse->uid;
+ cur->gid = (uid_t)fse->gid;
+ // if it's a hard-link and this is the last link, flag it
+ if ((fse->mode & FSE_MODE_HLINK) && fse->nlink == 0) {
+ cur->mode |= FSE_MODE_LAST_HLINK;
+ }
+ if (cur->mode & FSE_TRUNCATED_PATH) {
+ cur->flags |= KFSE_CONTAINS_DROPPED_EVENTS;
+ cur->mode &= ~FSE_TRUNCATED_PATH;
+ }
+ break;
+ }
case FSE_ARG_STRING:
- tmp16 = (int32_t)kea->len;
- CHECK_UPTR(sizeof(uint16_t));
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
-
- CHECK_UPTR(kea->len);
- error = uiomove((caddr_t)kea->data.str, kea->len, uio);
- break;
-
- case FSE_ARG_INT32:
- CHECK_UPTR(sizeof(uint16_t) + sizeof(int32_t));
- tmp16 = sizeof(int32_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.int32, sizeof(int32_t), uio);
- break;
-
- case FSE_ARG_INT64:
- printf("fs_events: 64-bit args not implemented on copyout.\n");
-// CHECK_UPTR(sizeof(uint16_t) + sizeof(int64_t));
-// tmp16 = sizeof(int64_t);
-// error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
-// error = uiomove((caddr_t)&kea->data.int64, sizeof(int64_t), uio);
- break;
-
- case FSE_ARG_RAW:
- tmp16 = (uint16_t)kea->len;
- CHECK_UPTR(sizeof(uint16_t));
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
-
- CHECK_UPTR(kea->len);
- error = uiomove((caddr_t)kea->data.ptr, kea->len, uio);
- break;
-
- case FSE_ARG_DEV:
- CHECK_UPTR(sizeof(uint16_t) + sizeof(dev_t));
- tmp16 = sizeof(dev_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.dev, sizeof(dev_t), uio);
- break;
-
- case FSE_ARG_INO:
- CHECK_UPTR(sizeof(uint16_t) + sizeof(ino_t));
- tmp16 = sizeof(ino_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.ino, sizeof(ino_t), uio);
- break;
-
- case FSE_ARG_MODE:
- // XXXdbg - NOTE: we use 32-bits for the mode, not
- // 16-bits like a real mode_t
- CHECK_UPTR(sizeof(uint16_t) + sizeof(int32_t));
- tmp16 = sizeof(int32_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.mode, sizeof(int32_t), uio);
- break;
-
- case FSE_ARG_UID:
- CHECK_UPTR(sizeof(uint16_t) + sizeof(uid_t));
- tmp16 = sizeof(uid_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.uid, sizeof(uid_t), uio);
- break;
-
- case FSE_ARG_GID:
- CHECK_UPTR(sizeof(uint16_t) + sizeof(gid_t));
- tmp16 = sizeof(gid_t);
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
- error = uiomove((caddr_t)&kea->data.gid, sizeof(gid_t), uio);
- break;
+ if (kfse->str != NULL) {
+ cur = kfse_dest;
+ }
+
+ cur->len = (int16_t)(va_arg(ap, int32_t) & 0x7fff);
+ if (cur->len >= 1) {
+ cur->str = vfs_addname(va_arg(ap, char *), cur->len, 0, 0);
+ } else {
+ printf("add_fsevent: funny looking string length: %d\n", (int)cur->len);
+ cur->len = 2;
+ cur->str = vfs_addname("/", cur->len, 0, 0);
+ }
+ if (cur->str[0] == 0) {
+ printf("add_fsevent: bogus looking string (len %d)\n", cur->len);
+ }
+ break;
+
+ case FSE_ARG_INT32: {
+ uint32_t ival = (uint32_t)va_arg(ap, int32_t);
+ kfse->uid = (ino64_t)ival;
+ break;
+ }
default:
- printf("fmod_watch: unknown arg type %d.\n", kea->type);
- break;
- }
+ printf("add_fsevent: unknown type %d\n", arg_type);
+ // just skip one 32-bit word and hope we sync up...
+ (void)va_arg(ap, int32_t);
+ }
}
- // make sure that we always end with a FSE_ARG_DONE
- if (i >= KFS_NUM_ARGS) {
- tmp16 = FSE_ARG_DONE;
- CHECK_UPTR(sizeof(uint16_t));
- error = uiomove((caddr_t)&tmp16, sizeof(uint16_t), uio);
+done_with_args:
+ va_end(ap);
+
+ OSBitAndAtomic16(~KFSE_BEING_CREATED, &kfse->flags);
+ if (kfse_dest) {
+ OSBitAndAtomic16(~KFSE_BEING_CREATED, &kfse_dest->flags);
}
-
- // LP64todo - fix this
- last_full_event_resid = uio_resid(uio);
-
- watcher->rd = (watcher->rd + 1) % watcher->eventq_size;
-
- if (OSAddAtomic(-1, (SInt32 *)&kfse->refcount) == 1) {
- do_free_event(kfse);
+ //
+ // now we have to go and let everyone know that
+ // is interested in this type of event
+ //
+ lock_watch_table();
+
+ for (i = 0; i < MAX_WATCHERS; i++) {
+ watcher = watcher_table[i];
+ if (watcher == NULL) {
+ continue;
+ }
+
+ if (type < watcher->num_events
+ && watcher->event_list[type] == FSE_REPORT
+ && watcher_cares_about_dev(watcher, dev)) {
+ if (watcher_add_event(watcher, kfse) != 0) {
+ watcher->num_dropped++;
+ continue;
+ }
+ }
+
+ // if (kfse->refcount < 1) {
+ // panic("add_fsevent: line %d: kfse recount %d but should be at least 1\n", __LINE__, kfse->refcount);
+ // }
+ }
+
+ unlock_watch_table();
+
+clean_up:
+
+ if (pathbuff) {
+ release_pathbuff(pathbuff);
+ pathbuff = NULL;
}
- }
- get_out:
- return error;
+ release_event_ref(kfse);
+
+ return error;
}
-// release any references we might have on vnodes which are
-// the mount point passed to us (so that it can be cleanly
-// unmounted).
-//
-// since we don't want to lose the events we'll convert the
-// vnode refs to the full path, inode #, and uid.
-//
-void
-fsevent_unmount(struct mount *mp)
+static void
+release_event_ref(kfs_event *kfse)
{
- int i, j;
- kfs_event *kfse;
- kfs_event_arg *kea;
-
- lck_rw_lock_exclusive(&fsevent_big_lock);
- lock_fs_event_buf();
-
- for(i=0; i < MAX_KFS_EVENTS; i++) {
- if (fs_event_buf[i].type == FSE_INVALID) {
- continue;
- }
-
- kfse = &fs_event_buf[i];
- for(j=0; j < KFS_NUM_ARGS; j++) {
- kea = &kfse->args[j];
- if (kea->type == FSE_ARG_DONE) {
- break;
- }
-
- if (kea->type == FSE_ARG_VNODE && kea->data.vp->v_mount == mp) {
- struct vnode *vp;
- char *pathbuff;
- int pathbuff_len;
+ int old_refcount;
+ kfs_event copy, dest_copy;
- vp = kea->data.vp;
- pathbuff = get_pathbuff();
- pathbuff_len = MAXPATHLEN;
-
- if (vn_getpath(vp, pathbuff, &pathbuff_len) != 0 || pathbuff[0] == '\0') {
- char *vname;
- vname = vnode_getname(vp);
+ old_refcount = OSAddAtomic(-1, &kfse->refcount);
+ if (old_refcount > 1) {
+ return;
+ }
- printf("fsevent_unmount: vn_getpath failed! vp 0x%x vname 0x%x (%s) vparent 0x%x\n",
- vp, vname, vname ? vname : "<null>", vp->v_parent);
+ lock_fs_event_list();
+ if (last_event_ptr == kfse) {
+ last_event_ptr = NULL;
+ last_event_type = -1;
+ last_coalesced_time = 0;
+ }
- if (vname)
- vnode_putname(vname);
- }
+ if (kfse->refcount < 0) {
+ panic("release_event_ref: bogus kfse refcount %d\n", kfse->refcount);
+ }
- // switch the type of the string
- kea->type = FSE_ARG_STRING;
- kea->data.str = vfs_addname(pathbuff, pathbuff_len, 0, 0);
- kea->len = pathbuff_len;
- release_pathbuff(pathbuff);
+ if (kfse->refcount > 0 || kfse->type == FSE_INVALID) {
+ // This is very subtle. Either of these conditions can
+ // be true if an event got recycled while we were waiting
+ // on the fs_event_list lock or the event got recycled,
+ // delivered, _and_ free'd by someone else while we were
+ // waiting on the fs event list lock. In either case
+ // we need to just unlock the list and return without
+ // doing anything because if the refcount is > 0 then
+ // someone else will take care of free'ing it and when
+ // the kfse->type is invalid then someone else already
+ // has handled free'ing the event (while we were blocked
+ // on the event list lock).
+ //
+ unlock_fs_event_list();
+ return;
+ }
- // and finally let go of the reference on the vnode
- vnode_rele_ext(vp, O_EVTONLY, 0);
- }
+ //
+ // make a copy of this so we can free things without
+ // holding the fs_event_buf lock
+ //
+ copy = *kfse;
+ if (kfse->type != FSE_DOCID_CREATED && kfse->type != FSE_DOCID_CHANGED && kfse->dest && OSAddAtomic(-1, &kfse->dest->refcount) == 1) {
+ dest_copy = *kfse->dest;
+ } else {
+ dest_copy.str = NULL;
+ dest_copy.len = 0;
+ dest_copy.type = FSE_INVALID;
}
- }
- unlock_fs_event_buf();
- lck_rw_done(&fsevent_big_lock);
-}
+ kfse->pid = kfse->type; // save this off for debugging...
+ kfse->uid = (uid_t)(long)kfse->str; // save this off for debugging...
+ kfse->gid = (gid_t)(long)current_thread();
+ kfse->str = (char *)0xdeadbeef; // XXXdbg - catch any cheaters...
-//
-// /dev/fsevents device code
-//
-static int fsevents_installed = 0;
-static struct lock__bsd__ fsevents_lck;
+ if (dest_copy.type != FSE_INVALID) {
+ kfse->dest->str = (char *)0xbadc0de; // XXXdbg - catch any cheaters...
+ kfse->dest->type = FSE_INVALID;
-typedef struct fsevent_handle {
- fs_event_watcher *watcher;
- struct selinfo si;
-} fsevent_handle;
+ if (kfse->dest->kevent_list.le_prev != NULL) {
+ num_events_outstanding--;
+ LIST_REMOVE(kfse->dest, kevent_list);
+ memset(&kfse->dest->kevent_list, 0xa5, sizeof(kfse->dest->kevent_list));
+ }
+ zfree(event_zone, kfse->dest);
+ }
-static int
-fseventsf_read(struct fileproc *fp, struct uio *uio,
- __unused kauth_cred_t *cred, __unused int flags,
- __unused struct proc *p)
-{
- fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
- int error;
+ // mark this fsevent as invalid
+ {
+ int otype;
- error = fmod_watch(fseh->watcher, uio);
+ otype = kfse->type;
+ kfse->type = FSE_INVALID;
- return error;
-}
+ if (kfse->kevent_list.le_prev != NULL) {
+ num_events_outstanding--;
+ if (otype == FSE_RENAME) {
+ num_pending_rename--;
+ }
+ LIST_REMOVE(kfse, kevent_list);
+ memset(&kfse->kevent_list, 0, sizeof(kfse->kevent_list));
+ }
+ }
-static int
-fseventsf_write(__unused struct fileproc *fp, __unused struct uio *uio,
- __unused kauth_cred_t *cred, __unused int flags,
- __unused struct proc *p)
-{
- return EIO;
-}
+ zfree(event_zone, kfse);
+ unlock_fs_event_list();
+
+ // if we have a pointer in the union
+ if (copy.str && copy.type != FSE_DOCID_CREATED && copy.type != FSE_DOCID_CHANGED) {
+ if (copy.len == 0) { // and it's not a string
+ panic("%s:%d: no more fref.vp!\n", __FILE__, __LINE__);
+ // vnode_rele_ext(copy.fref.vp, O_EVTONLY, 0);
+ } else { // else it's a string
+ vfs_removename(copy.str);
+ }
+ }
+
+ if (dest_copy.type != FSE_INVALID && dest_copy.str) {
+ if (dest_copy.len == 0) {
+ panic("%s:%d: no more fref.vp!\n", __FILE__, __LINE__);
+ // vnode_rele_ext(dest_copy.fref.vp, O_EVTONLY, 0);
+ } else {
+ vfs_removename(dest_copy.str);
+ }
+ }
+}
static int
-fseventsf_ioctl(struct fileproc *fp, u_long cmd, caddr_t data, struct proc *p)
+add_watcher(int8_t *event_list, int32_t num_events, int32_t eventq_size, fs_event_watcher **watcher_out, void *fseh)
{
- fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
- int ret = 0;
- pid_t pid = 0;
- fsevent_dev_filter_args *devfilt_args=(fsevent_dev_filter_args *)data;
+ int i;
+ fs_event_watcher *watcher;
- switch (cmd) {
- case FIONBIO:
- case FIOASYNC:
- return 0;
+ if (eventq_size <= 0 || eventq_size > 100 * max_kfs_events) {
+ eventq_size = max_kfs_events;
+ }
- case FSEVENTS_DEVICE_FILTER: {
- int new_num_devices;
- dev_t *devices_to_watch, *tmp=NULL;
-
- if (devfilt_args->num_devices > 256) {
- ret = EINVAL;
- break;
- }
-
- new_num_devices = devfilt_args->num_devices;
- if (new_num_devices == 0) {
- tmp = fseh->watcher->devices_to_watch;
+ // Note: the event_queue follows the fs_event_watcher struct
+ // in memory so we only have to do one allocation
+ MALLOC(watcher,
+ fs_event_watcher *,
+ sizeof(fs_event_watcher) + eventq_size * sizeof(kfs_event *),
+ M_TEMP, M_WAITOK);
+ if (watcher == NULL) {
+ return ENOMEM;
+ }
+
+ watcher->event_list = event_list;
+ watcher->num_events = num_events;
+ watcher->devices_not_to_watch = NULL;
+ watcher->num_devices = 0;
+ watcher->flags = 0;
+ watcher->event_queue = (kfs_event **)&watcher[1];
+ watcher->eventq_size = eventq_size;
+ watcher->rd = 0;
+ watcher->wr = 0;
+ watcher->blockers = 0;
+ watcher->num_readers = 0;
+ watcher->max_event_id = 0;
+ watcher->fseh = fseh;
+ watcher->pid = proc_selfpid();
+ proc_selfname(watcher->proc_name, sizeof(watcher->proc_name));
+
+ watcher->num_dropped = 0; // XXXdbg - debugging
+
+ if (!strncmp(watcher->proc_name, "fseventsd", sizeof(watcher->proc_name)) ||
+ !strncmp(watcher->proc_name, "coreservicesd", sizeof(watcher->proc_name)) ||
+ !strncmp(watcher->proc_name, "revisiond", sizeof(watcher->proc_name)) ||
+ !strncmp(watcher->proc_name, "mds", sizeof(watcher->proc_name))) {
+ watcher->flags |= WATCHER_APPLE_SYSTEM_SERVICE;
+ } else {
+ printf("fsevents: watcher %s (pid: %d) - Using /dev/fsevents directly is unsupported. Migrate to FSEventsFramework\n",
+ watcher->proc_name, watcher->pid);
+ }
- lock_watch_list();
- fseh->watcher->devices_to_watch = NULL;
- fseh->watcher->num_devices = new_num_devices;
- unlock_watch_list();
+ lock_watch_table();
- if (tmp) {
- FREE(tmp, M_TEMP);
+ // find a slot for the new watcher
+ for (i = 0; i < MAX_WATCHERS; i++) {
+ if (watcher_table[i] == NULL) {
+ watcher->my_id = i;
+ watcher_table[i] = watcher;
+ break;
}
- break;
- }
+ }
- MALLOC(devices_to_watch, dev_t *,
- new_num_devices * sizeof(dev_t),
- M_TEMP, M_WAITOK);
- if (devices_to_watch == NULL) {
- ret = ENOMEM;
- break;
- }
-
- ret = copyin(CAST_USER_ADDR_T(devfilt_args->devices),
- (void *)devices_to_watch,
- new_num_devices * sizeof(dev_t));
- if (ret) {
- FREE(devices_to_watch, M_TEMP);
- break;
- }
+ if (i >= MAX_WATCHERS) {
+ printf("fsevents: too many watchers!\n");
+ unlock_watch_table();
+ FREE(watcher, M_TEMP);
+ return ENOSPC;
+ }
- lock_watch_list();
- fseh->watcher->num_devices = new_num_devices;
- tmp = fseh->watcher->devices_to_watch;
- fseh->watcher->devices_to_watch = devices_to_watch;
- unlock_watch_list();
+ // now update the global list of who's interested in
+ // events of a particular type...
+ for (i = 0; i < num_events; i++) {
+ if (event_list[i] != FSE_IGNORE && i < FSE_MAX_EVENTS) {
+ fs_event_type_watchers[i]++;
+ }
+ }
- if (tmp) {
- FREE(tmp, M_TEMP);
- }
-
- break;
- }
+ unlock_watch_table();
- default:
- ret = EINVAL;
- break;
- }
+ *watcher_out = watcher;
- return (ret);
+ return 0;
}
-static int
-fseventsf_select(struct fileproc *fp, int which, void *wql, struct proc *p)
+
+static void
+remove_watcher(fs_event_watcher *target)
{
- fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
- int ready = 0;
+ int i, j, counter = 0;
+ fs_event_watcher *watcher;
+ kfs_event *kfse;
- if ((which != FREAD) || (fseh->watcher->flags & WATCHER_CLOSING)) {
- return 0;
- }
+ lock_watch_table();
+ for (j = 0; j < MAX_WATCHERS; j++) {
+ watcher = watcher_table[j];
+ if (watcher != target) {
+ continue;
+ }
- // if there's nothing in the queue, we're not ready
- if (fseh->watcher->rd == fseh->watcher->wr) {
- ready = 0;
- } else {
- ready = 1;
- }
+ watcher_table[j] = NULL;
- if (!ready) {
- selrecord(p, &fseh->si, wql);
- }
+ for (i = 0; i < watcher->num_events; i++) {
+ if (watcher->event_list[i] != FSE_IGNORE && i < FSE_MAX_EVENTS) {
+ fs_event_type_watchers[i]--;
+ }
+ }
- return ready;
-}
+ if (watcher->flags & WATCHER_CLOSING) {
+ unlock_watch_table();
+ return;
+ }
+ // printf("fsevents: removing watcher %p (rd %d wr %d num_readers %d flags 0x%x)\n", watcher, watcher->rd, watcher->wr, watcher->num_readers, watcher->flags);
+ watcher->flags |= WATCHER_CLOSING;
+ OSAddAtomic(1, &watcher->num_readers);
-static int
-fseventsf_stat(struct fileproc *fp, struct stat *sb, struct proc *p)
-{
- return ENOTSUP;
-}
+ unlock_watch_table();
+ while (watcher->num_readers > 1 && counter++ < 5000) {
+ lock_watch_table();
+ fsevents_wakeup(watcher); // in case they're asleep
+ unlock_watch_table();
-static int
-fseventsf_close(struct fileglob *fg, struct proc *p)
-{
- fsevent_handle *fseh = (struct fsevent_handle *)fg->fg_data;
+ tsleep(watcher, PRIBIO, "fsevents-close", 1);
+ }
+ if (counter++ >= 5000) {
+ // printf("fsevents: close: still have readers! (%d)\n", watcher->num_readers);
+ panic("fsevents: close: still have readers! (%d)\n", watcher->num_readers);
+ }
- remove_watcher(fseh->watcher);
+ // drain the event_queue
+
+ lck_rw_lock_exclusive(&event_handling_lock);
+ while (watcher->rd != watcher->wr) {
+ kfse = watcher->event_queue[watcher->rd];
+ watcher->event_queue[watcher->rd] = NULL;
+ watcher->rd = (watcher->rd + 1) % watcher->eventq_size;
+ OSSynchronizeIO();
+ if (kfse != NULL && kfse->type != FSE_INVALID && kfse->refcount >= 1) {
+ release_event_ref(kfse);
+ }
+ }
+ lck_rw_unlock_exclusive(&event_handling_lock);
- fg->fg_data = NULL;
- fseh->watcher = NULL;
- FREE(fseh, M_TEMP);
+ if (watcher->event_list) {
+ FREE(watcher->event_list, M_TEMP);
+ watcher->event_list = NULL;
+ }
+ if (watcher->devices_not_to_watch) {
+ FREE(watcher->devices_not_to_watch, M_TEMP);
+ watcher->devices_not_to_watch = NULL;
+ }
+ FREE(watcher, M_TEMP);
- return 0;
-}
+ return;
+ }
-int
-fseventsf_kqfilter(struct fileproc *fp, struct knote *kn, struct proc *p)
-{
- // XXXdbg
- return 0;
+ unlock_watch_table();
}
-static int
-fseventsf_drain(struct fileproc *fp, struct proc *p)
-{
- int counter = 0;
- fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
-
- fseh->watcher->flags |= WATCHER_CLOSING;
-
- // if there are people still waiting, sleep for 10ms to
- // let them clean up and get out of there. however we
- // also don't want to get stuck forever so if they don't
- // exit after 5 seconds we're tearing things down anyway.
- while(fseh->watcher->blockers && counter++ < 500) {
- // issue wakeup in case anyone is blocked waiting for an event
- // do this each time we wakeup in case the blocker missed
- // the wakeup due to the unprotected test of WATCHER_CLOSING
- // and decision to tsleep in fmod_watch... this bit of
- // latency is a decent tradeoff against not having to
- // take and drop a lock in fmod_watch
- wakeup((caddr_t)fseh->watcher);
-
- tsleep((caddr_t)fseh->watcher, PRIBIO, "watcher-close", 1);
- }
-
- return 0;
-}
+#define EVENT_DELAY_IN_MS 10
+static thread_call_t event_delivery_timer = NULL;
+static int timer_set = 0;
-static int
-fseventsopen(dev_t dev, int flag, int mode, struct proc *p)
+static void
+delayed_event_delivery(__unused void *param0, __unused void *param1)
{
- if (!is_suser()) {
- return EPERM;
- }
-
- return 0;
-}
+ int i;
-static int
-fseventsclose(dev_t dev, int flag, int mode, struct proc *p)
-{
- return 0;
-}
+ lock_watch_table();
-static int
-fseventsread(dev_t dev, struct uio *uio, int ioflag)
-{
- return EIO;
-}
+ for (i = 0; i < MAX_WATCHERS; i++) {
+ if (watcher_table[i] != NULL && watcher_table[i]->rd != watcher_table[i]->wr) {
+ fsevents_wakeup(watcher_table[i]);
+ }
+ }
-static int
-fseventswrite(dev_t dev, struct uio *uio, int ioflag)
-{
- return EIO;
+ timer_set = 0;
+
+ unlock_watch_table();
}
-static struct fileops fsevents_fops = {
- fseventsf_read,
- fseventsf_write,
- fseventsf_ioctl,
- fseventsf_select,
- fseventsf_close,
- fseventsf_kqfilter,
- fseventsf_drain
-};
+//
+// The watch table must be locked before calling this function.
+//
+static void
+schedule_event_wakeup(void)
+{
+ uint64_t deadline;
+ if (event_delivery_timer == NULL) {
+ event_delivery_timer = thread_call_allocate((thread_call_func_t)delayed_event_delivery, NULL);
+ }
+ clock_interval_to_deadline(EVENT_DELAY_IN_MS, 1000 * 1000, &deadline);
-static int
-fseventsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
-{
- struct fileproc *f;
- int fd, error;
- fsevent_handle *fseh = NULL;
- fsevent_clone_args *fse_clone_args=(fsevent_clone_args *)data;
- int8_t *event_list;
-
- switch (cmd) {
- case FSEVENTS_CLONE:
- if (fse_clone_args->num_events < 0 || fse_clone_args->num_events > 4096) {
- return EINVAL;
- }
-
- MALLOC(fseh, fsevent_handle *, sizeof(fsevent_handle),
- M_TEMP, M_WAITOK);
- memset(fseh, 0, sizeof(fsevent_handle));
-
- MALLOC(event_list, int8_t *,
- fse_clone_args->num_events * sizeof(int8_t),
- M_TEMP, M_WAITOK);
-
- error = copyin(CAST_USER_ADDR_T(fse_clone_args->event_list),
- (void *)event_list,
- fse_clone_args->num_events * sizeof(int8_t));
- if (error) {
- FREE(event_list, M_TEMP);
- FREE(fseh, M_TEMP);
- return error;
- }
-
- error = add_watcher(event_list,
- fse_clone_args->num_events,
- fse_clone_args->event_queue_depth,
- &fseh->watcher);
- if (error) {
- FREE(event_list, M_TEMP);
- FREE(fseh, M_TEMP);
- return error;
- }
-
- error = falloc(p, &f, &fd);
- if (error) {
- FREE(event_list, M_TEMP);
- FREE(fseh, M_TEMP);
- return (error);
- }
- proc_fdlock(p);
- f->f_fglob->fg_flag = FREAD | FWRITE;
- f->f_fglob->fg_type = DTYPE_FSEVENTS;
- f->f_fglob->fg_ops = &fsevents_fops;
- f->f_fglob->fg_data = (caddr_t) fseh;
- proc_fdunlock(p);
- copyout((void *)&fd, CAST_USER_ADDR_T(fse_clone_args->fd), sizeof(int32_t));
- proc_fdlock(p);
- *fdflags(p, fd) &= ~UF_RESERVED;
- fp_drop(p, fd, f, 1);
- proc_fdunlock(p);
- break;
+ thread_call_enter_delayed(event_delivery_timer, deadline);
+ timer_set = 1;
+}
- default:
- error = EINVAL;
- break;
- }
- return error;
-}
+#define MAX_NUM_PENDING 16
+
+//
+// NOTE: the watch table must be locked before calling
+// this routine.
+//
static int
-fseventsselect(dev_t dev, int rw, struct proc *p)
+watcher_add_event(fs_event_watcher *watcher, kfs_event *kfse)
{
- return 0;
-}
+ if (kfse->abstime > watcher->max_event_id) {
+ watcher->max_event_id = kfse->abstime;
+ }
-static void
-fsevents_wakeup(fsevent_handle *fseh)
+ if (((watcher->wr + 1) % watcher->eventq_size) == watcher->rd) {
+ watcher->flags |= WATCHER_DROPPED_EVENTS;
+ fsevents_wakeup(watcher);
+ return ENOSPC;
+ }
+
+ OSAddAtomic(1, &kfse->refcount);
+ watcher->event_queue[watcher->wr] = kfse;
+ OSSynchronizeIO();
+ watcher->wr = (watcher->wr + 1) % watcher->eventq_size;
+
+ //
+ // wake up the watcher if there are more than MAX_NUM_PENDING events.
+ // otherwise schedule a timer (if one isn't already set) which will
+ // send any pending events if no more are received in the next
+ // EVENT_DELAY_IN_MS milli-seconds.
+ //
+ int32_t num_pending = 0;
+ if (watcher->rd < watcher->wr) {
+ num_pending = watcher->wr - watcher->rd;
+ }
+
+ if (watcher->rd > watcher->wr) {
+ num_pending = watcher->wr + watcher->eventq_size - watcher->rd;
+ }
+
+ if (num_pending > (watcher->eventq_size * 3 / 4) && !(watcher->flags & WATCHER_APPLE_SYSTEM_SERVICE)) {
+ /* Non-Apple Service is falling behind, start dropping events for this process */
+ lck_rw_lock_exclusive(&event_handling_lock);
+ while (watcher->rd != watcher->wr) {
+ kfse = watcher->event_queue[watcher->rd];
+ watcher->event_queue[watcher->rd] = NULL;
+ watcher->rd = (watcher->rd + 1) % watcher->eventq_size;
+ OSSynchronizeIO();
+ if (kfse != NULL && kfse->type != FSE_INVALID && kfse->refcount >= 1) {
+ release_event_ref(kfse);
+ }
+ }
+ watcher->flags |= WATCHER_DROPPED_EVENTS;
+ lck_rw_unlock_exclusive(&event_handling_lock);
+
+ printf("fsevents: watcher falling behind: %s (pid: %d) rd: %4d wr: %4d q_size: %4d flags: 0x%x\n",
+ watcher->proc_name, watcher->pid, watcher->rd, watcher->wr,
+ watcher->eventq_size, watcher->flags);
+
+ fsevents_wakeup(watcher);
+ } else if (num_pending > MAX_NUM_PENDING) {
+ fsevents_wakeup(watcher);
+ } else if (timer_set == 0) {
+ schedule_event_wakeup();
+ }
+
+ return 0;
+}
+
+static int
+fill_buff(uint16_t type, int32_t size, const void *data,
+ char *buff, int32_t *_buff_idx, int32_t buff_sz,
+ struct uio *uio)
+{
+ int32_t amt, error = 0, buff_idx = *_buff_idx;
+ uint16_t tmp;
+
+ //
+ // the +1 on the size is to guarantee that the main data
+ // copy loop will always copy at least 1 byte
+ //
+ if ((buff_sz - buff_idx) <= (int)(2 * sizeof(uint16_t) + 1)) {
+ if (buff_idx > uio_resid(uio)) {
+ error = ENOSPC;
+ goto get_out;
+ }
+
+ error = uiomove(buff, buff_idx, uio);
+ if (error) {
+ goto get_out;
+ }
+ buff_idx = 0;
+ }
+
+ // copy out the header (type & size)
+ memcpy(&buff[buff_idx], &type, sizeof(uint16_t));
+ buff_idx += sizeof(uint16_t);
+
+ tmp = size & 0xffff;
+ memcpy(&buff[buff_idx], &tmp, sizeof(uint16_t));
+ buff_idx += sizeof(uint16_t);
+
+ // now copy the body of the data, flushing along the way
+ // if the buffer fills up.
+ //
+ while (size > 0) {
+ amt = (size < (buff_sz - buff_idx)) ? size : (buff_sz - buff_idx);
+ memcpy(&buff[buff_idx], data, amt);
+
+ size -= amt;
+ buff_idx += amt;
+ data = (const char *)data + amt;
+ if (size > (buff_sz - buff_idx)) {
+ if (buff_idx > uio_resid(uio)) {
+ error = ENOSPC;
+ goto get_out;
+ }
+ error = uiomove(buff, buff_idx, uio);
+ if (error) {
+ goto get_out;
+ }
+ buff_idx = 0;
+ }
+
+ if (amt == 0) { // just in case...
+ break;
+ }
+ }
+
+get_out:
+ *_buff_idx = buff_idx;
+
+ return error;
+}
+
+
+static int copy_out_kfse(fs_event_watcher *watcher, kfs_event *kfse, struct uio *uio) __attribute__((noinline));
+
+static int
+copy_out_kfse(fs_event_watcher *watcher, kfs_event *kfse, struct uio *uio)
+{
+ int error;
+ uint16_t tmp16;
+ int32_t type;
+ kfs_event *cur;
+ char evbuff[512];
+ int evbuff_idx = 0;
+
+ if (kfse->type == FSE_INVALID) {
+ panic("fsevents: copy_out_kfse: asked to copy out an invalid event (kfse %p, refcount %d fref ptr %p)\n", kfse, kfse->refcount, kfse->str);
+ }
+
+ if (kfse->flags & KFSE_BEING_CREATED) {
+ return 0;
+ }
+
+ if (((kfse->type == FSE_RENAME) || (kfse->type == FSE_CLONE)) && kfse->dest == NULL) {
+ //
+ // This can happen if an event gets recycled but we had a
+ // pointer to it in our event queue. The event is the
+ // destination of a rename or clone which we'll process separately
+ // (that is, another kfse points to this one so it's ok
+ // to skip this guy because we'll process it when we process
+ // the other one)
+ error = 0;
+ goto get_out;
+ }
+
+ if (watcher->flags & WATCHER_WANTS_EXTENDED_INFO) {
+ type = (kfse->type & 0xfff);
+
+ if (kfse->flags & KFSE_CONTAINS_DROPPED_EVENTS) {
+ type |= (FSE_CONTAINS_DROPPED_EVENTS << FSE_FLAG_SHIFT);
+ } else if (kfse->flags & KFSE_COMBINED_EVENTS) {
+ type |= (FSE_COMBINED_EVENTS << FSE_FLAG_SHIFT);
+ }
+ } else {
+ type = (int32_t)kfse->type;
+ }
+
+ // copy out the type of the event
+ memcpy(evbuff, &type, sizeof(int32_t));
+ evbuff_idx += sizeof(int32_t);
+
+ // copy out the pid of the person that generated the event
+ memcpy(&evbuff[evbuff_idx], &kfse->pid, sizeof(pid_t));
+ evbuff_idx += sizeof(pid_t);
+
+ cur = kfse;
+
+copy_again:
+
+ if (kfse->type == FSE_DOCID_CHANGED || kfse->type == FSE_DOCID_CREATED) {
+ dev_t dev = cur->dev;
+ ino64_t ino = cur->ino;
+ uint64_t ival;
+
+ error = fill_buff(FSE_ARG_DEV, sizeof(dev_t), &dev, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ error = fill_buff(FSE_ARG_INO, sizeof(ino64_t), &ino, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ memcpy(&ino, &cur->str, sizeof(ino64_t));
+ error = fill_buff(FSE_ARG_INO, sizeof(ino64_t), &ino, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ memcpy(&ival, &cur->uid, sizeof(uint64_t)); // the docid gets stuffed into the ino field
+ error = fill_buff(FSE_ARG_INT64, sizeof(uint64_t), &ival, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ goto done;
+ }
+
+ if (kfse->type == FSE_UNMOUNT_PENDING) {
+ dev_t dev = cur->dev;
+
+ error = fill_buff(FSE_ARG_DEV, sizeof(dev_t), &dev, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ goto done;
+ }
+
+ if (cur->str == NULL || cur->str[0] == '\0') {
+ printf("copy_out_kfse:2: empty/short path (%s)\n", cur->str);
+ error = fill_buff(FSE_ARG_STRING, 2, "/", evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ } else {
+ error = fill_buff(FSE_ARG_STRING, cur->len, cur->str, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ }
+ if (error != 0) {
+ goto get_out;
+ }
+
+ if (cur->dev == 0 && cur->ino == 0) {
+ // this happens when a rename event happens and the
+ // destination of the rename did not previously exist.
+ // it thus has no other file info so skip copying out
+ // the stuff below since it isn't initialized
+ goto done;
+ }
+
+
+ if (watcher->flags & WATCHER_WANTS_COMPACT_EVENTS) {
+ int32_t finfo_size;
+
+ finfo_size = sizeof(dev_t) + sizeof(ino64_t) + sizeof(int32_t) + sizeof(uid_t) + sizeof(gid_t);
+ error = fill_buff(FSE_ARG_FINFO, finfo_size, &cur->ino, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+ } else {
+ error = fill_buff(FSE_ARG_DEV, sizeof(dev_t), &cur->dev, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ error = fill_buff(FSE_ARG_INO, sizeof(ino64_t), &cur->ino, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ error = fill_buff(FSE_ARG_MODE, sizeof(int32_t), &cur->mode, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ error = fill_buff(FSE_ARG_UID, sizeof(uid_t), &cur->uid, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ error = fill_buff(FSE_ARG_GID, sizeof(gid_t), &cur->gid, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+ }
+
+
+ if (cur->dest) {
+ cur = cur->dest;
+ goto copy_again;
+ }
+
+done:
+ // very last thing: the time stamp
+ error = fill_buff(FSE_ARG_INT64, sizeof(uint64_t), &cur->abstime, evbuff, &evbuff_idx, sizeof(evbuff), uio);
+ if (error != 0) {
+ goto get_out;
+ }
+
+ // check if the FSE_ARG_DONE will fit
+ if (sizeof(uint16_t) > sizeof(evbuff) - evbuff_idx) {
+ if (evbuff_idx > uio_resid(uio)) {
+ error = ENOSPC;
+ goto get_out;
+ }
+ error = uiomove(evbuff, evbuff_idx, uio);
+ if (error) {
+ goto get_out;
+ }
+ evbuff_idx = 0;
+ }
+
+ tmp16 = FSE_ARG_DONE;
+ memcpy(&evbuff[evbuff_idx], &tmp16, sizeof(uint16_t));
+ evbuff_idx += sizeof(uint16_t);
+
+ // flush any remaining data in the buffer (and hopefully
+ // in most cases this is the only uiomove we'll do)
+ if (evbuff_idx > uio_resid(uio)) {
+ error = ENOSPC;
+ } else {
+ error = uiomove(evbuff, evbuff_idx, uio);
+ }
+
+get_out:
+
+ return error;
+}
+
+
+
+static int
+fmod_watch(fs_event_watcher *watcher, struct uio *uio)
+{
+ int error = 0;
+ user_ssize_t last_full_event_resid;
+ kfs_event *kfse;
+ uint16_t tmp16;
+ int skipped;
+
+ last_full_event_resid = uio_resid(uio);
+
+ // need at least 2048 bytes of space (maxpathlen + 1 event buf)
+ if (uio_resid(uio) < 2048 || watcher == NULL) {
+ return EINVAL;
+ }
+
+ if (watcher->flags & WATCHER_CLOSING) {
+ return 0;
+ }
+
+ if (OSAddAtomic(1, &watcher->num_readers) != 0) {
+ // don't allow multiple threads to read from the fd at the same time
+ OSAddAtomic(-1, &watcher->num_readers);
+ return EAGAIN;
+ }
+
+restart_watch:
+ if (watcher->rd == watcher->wr) {
+ if (watcher->flags & WATCHER_CLOSING) {
+ OSAddAtomic(-1, &watcher->num_readers);
+ return 0;
+ }
+ OSAddAtomic(1, &watcher->blockers);
+
+ // there's nothing to do, go to sleep
+ error = tsleep((caddr_t)watcher, PUSER | PCATCH, "fsevents_empty", 0);
+
+ OSAddAtomic(-1, &watcher->blockers);
+
+ if (error != 0 || (watcher->flags & WATCHER_CLOSING)) {
+ OSAddAtomic(-1, &watcher->num_readers);
+ return error;
+ }
+ }
+
+ // if we dropped events, return that as an event first
+ if (watcher->flags & WATCHER_DROPPED_EVENTS) {
+ int32_t val = FSE_EVENTS_DROPPED;
+
+ error = uiomove((caddr_t)&val, sizeof(int32_t), uio);
+ if (error == 0) {
+ val = 0; // a fake pid
+ error = uiomove((caddr_t)&val, sizeof(int32_t), uio);
+
+ tmp16 = FSE_ARG_DONE; // makes it a consistent msg
+ error = uiomove((caddr_t)&tmp16, sizeof(int16_t), uio);
+
+ last_full_event_resid = uio_resid(uio);
+ }
+
+ if (error) {
+ OSAddAtomic(-1, &watcher->num_readers);
+ return error;
+ }
+
+ watcher->flags &= ~WATCHER_DROPPED_EVENTS;
+ }
+
+ skipped = 0;
+
+ lck_rw_lock_shared(&event_handling_lock);
+ while (uio_resid(uio) > 0 && watcher->rd != watcher->wr) {
+ if (watcher->flags & WATCHER_CLOSING) {
+ break;
+ }
+
+ //
+ // check if the event is something of interest to us
+ // (since it may have been recycled/reused and changed
+ // its type or which device it is for)
+ //
+ kfse = watcher->event_queue[watcher->rd];
+ if (!kfse || kfse->type == FSE_INVALID || kfse->type >= watcher->num_events || kfse->refcount < 1) {
+ break;
+ }
+
+ if (watcher->event_list[kfse->type] == FSE_REPORT && watcher_cares_about_dev(watcher, kfse->dev)) {
+ if (!(watcher->flags & WATCHER_APPLE_SYSTEM_SERVICE) && kfse->type != FSE_DOCID_CREATED && kfse->type != FSE_DOCID_CHANGED && is_ignored_directory(kfse->str)) {
+ // If this is not an Apple System Service, skip specified directories
+ // radar://12034844
+ error = 0;
+ skipped = 1;
+ } else {
+ skipped = 0;
+ if (last_event_ptr == kfse) {
+ last_event_ptr = NULL;
+ last_event_type = -1;
+ last_coalesced_time = 0;
+ }
+ error = copy_out_kfse(watcher, kfse, uio);
+ if (error != 0) {
+ // if an event won't fit or encountered an error while
+ // we were copying it out, then backup to the last full
+ // event and just bail out. if the error was ENOENT
+ // then we can continue regular processing, otherwise
+ // we should unlock things and return.
+ uio_setresid(uio, last_full_event_resid);
+ if (error != ENOENT) {
+ lck_rw_unlock_shared(&event_handling_lock);
+ error = 0;
+ goto get_out;
+ }
+ }
+
+ last_full_event_resid = uio_resid(uio);
+ }
+ }
+
+ watcher->event_queue[watcher->rd] = NULL;
+ watcher->rd = (watcher->rd + 1) % watcher->eventq_size;
+ OSSynchronizeIO();
+ release_event_ref(kfse);
+ }
+ lck_rw_unlock_shared(&event_handling_lock);
+
+ if (skipped && error == 0) {
+ goto restart_watch;
+ }
+
+get_out:
+ OSAddAtomic(-1, &watcher->num_readers);
+
+ return error;
+}
+
+
+//
+// Shoo watchers away from a volume that's about to be unmounted
+// (so that it can be cleanly unmounted).
+//
+void
+fsevent_unmount(__unused struct mount *mp, __unused vfs_context_t ctx)
+{
+#if CONFIG_EMBEDDED
+ dev_t dev = mp->mnt_vfsstat.f_fsid.val[0];
+ int error, waitcount = 0;
+ struct timespec ts = {.tv_sec = 1, .tv_nsec = 0};
+
+ // wait for any other pending unmounts to complete
+ lock_watch_table();
+ while (fsevent_unmount_dev != 0) {
+ error = msleep((caddr_t)&fsevent_unmount_dev, &watch_table_lock, PRIBIO, "fsevent_unmount_wait", &ts);
+ if (error == EWOULDBLOCK) {
+ error = 0;
+ }
+ if (!error && (++waitcount >= 10)) {
+ error = EWOULDBLOCK;
+ printf("timeout waiting to signal unmount pending for dev %d (fsevent_unmount_dev %d)\n", dev, fsevent_unmount_dev);
+ }
+ if (error) {
+ // there's a problem, bail out
+ unlock_watch_table();
+ return;
+ }
+ }
+ if (fs_event_type_watchers[FSE_UNMOUNT_PENDING] == 0) {
+ // nobody watching for unmount pending events
+ unlock_watch_table();
+ return;
+ }
+ // this is now the current unmount pending
+ fsevent_unmount_dev = dev;
+ fsevent_unmount_ack_count = fs_event_type_watchers[FSE_UNMOUNT_PENDING];
+ unlock_watch_table();
+
+ // send an event to notify the watcher they need to get off the mount
+ error = add_fsevent(FSE_UNMOUNT_PENDING, ctx, FSE_ARG_DEV, dev, FSE_ARG_DONE);
+
+ // wait for acknowledgment(s) (give up if it takes too long)
+ lock_watch_table();
+ waitcount = 0;
+ while (fsevent_unmount_dev == dev) {
+ error = msleep((caddr_t)&fsevent_unmount_dev, &watch_table_lock, PRIBIO, "fsevent_unmount_pending", &ts);
+ if (error == EWOULDBLOCK) {
+ error = 0;
+ }
+ if (!error && (++waitcount >= 10)) {
+ error = EWOULDBLOCK;
+ printf("unmount pending ack timeout for dev %d\n", dev);
+ }
+ if (error) {
+ // there's a problem, bail out
+ if (fsevent_unmount_dev == dev) {
+ fsevent_unmount_dev = 0;
+ fsevent_unmount_ack_count = 0;
+ }
+ wakeup((caddr_t)&fsevent_unmount_dev);
+ break;
+ }
+ }
+ unlock_watch_table();
+#endif
+}
+
+
+//
+// /dev/fsevents device code
+//
+static int fsevents_installed = 0;
+
+typedef struct fsevent_handle {
+ UInt32 flags;
+ SInt32 active;
+ fs_event_watcher *watcher;
+ struct klist knotes;
+ struct selinfo si;
+} fsevent_handle;
+
+#define FSEH_CLOSING 0x0001
+
+static int
+fseventsf_read(struct fileproc *fp, struct uio *uio,
+ __unused int flags, __unused vfs_context_t ctx)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
+ int error;
+
+ error = fmod_watch(fseh->watcher, uio);
+
+ return error;
+}
+
+
+#pragma pack(push, 4)
+typedef struct fsevent_dev_filter_args32 {
+ uint32_t num_devices;
+ user32_addr_t devices;
+} fsevent_dev_filter_args32;
+typedef struct fsevent_dev_filter_args64 {
+ uint32_t num_devices;
+ user64_addr_t devices;
+} fsevent_dev_filter_args64;
+#pragma pack(pop)
+
+#define FSEVENTS_DEVICE_FILTER_32 _IOW('s', 100, fsevent_dev_filter_args32)
+#define FSEVENTS_DEVICE_FILTER_64 _IOW('s', 100, fsevent_dev_filter_args64)
+
+static int
+fseventsf_ioctl(struct fileproc *fp, u_long cmd, caddr_t data, vfs_context_t ctx)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
+ int ret = 0;
+ fsevent_dev_filter_args64 *devfilt_args, _devfilt_args;
+
+ OSAddAtomic(1, &fseh->active);
+ if (fseh->flags & FSEH_CLOSING) {
+ OSAddAtomic(-1, &fseh->active);
+ return 0;
+ }
+
+ switch (cmd) {
+ case FIONBIO:
+ case FIOASYNC:
+ break;
+
+ case FSEVENTS_WANT_COMPACT_EVENTS: {
+ fseh->watcher->flags |= WATCHER_WANTS_COMPACT_EVENTS;
+ break;
+ }
+
+ case FSEVENTS_WANT_EXTENDED_INFO: {
+ fseh->watcher->flags |= WATCHER_WANTS_EXTENDED_INFO;
+ break;
+ }
+
+ case FSEVENTS_GET_CURRENT_ID: {
+ *(uint64_t *)data = fseh->watcher->max_event_id;
+ ret = 0;
+ break;
+ }
+
+ case FSEVENTS_DEVICE_FILTER_32: {
+ if (proc_is64bit(vfs_context_proc(ctx))) {
+ ret = EINVAL;
+ break;
+ }
+ fsevent_dev_filter_args32 *devfilt_args32 = (fsevent_dev_filter_args32 *)data;
+
+ devfilt_args = &_devfilt_args;
+ memset(devfilt_args, 0, sizeof(fsevent_dev_filter_args64));
+ devfilt_args->num_devices = devfilt_args32->num_devices;
+ devfilt_args->devices = CAST_USER_ADDR_T(devfilt_args32->devices);
+ goto handle_dev_filter;
+ }
+
+ case FSEVENTS_DEVICE_FILTER_64:
+ if (!proc_is64bit(vfs_context_proc(ctx))) {
+ ret = EINVAL;
+ break;
+ }
+ devfilt_args = (fsevent_dev_filter_args64 *)data;
+
+handle_dev_filter:
+ {
+ int new_num_devices;
+ dev_t *devices_not_to_watch, *tmp = NULL;
+
+ if (devfilt_args->num_devices > 256) {
+ ret = EINVAL;
+ break;
+ }
+
+ new_num_devices = devfilt_args->num_devices;
+ if (new_num_devices == 0) {
+ lock_watch_table();
+
+ tmp = fseh->watcher->devices_not_to_watch;
+ fseh->watcher->devices_not_to_watch = NULL;
+ fseh->watcher->num_devices = new_num_devices;
+
+ unlock_watch_table();
+ if (tmp) {
+ FREE(tmp, M_TEMP);
+ }
+ break;
+ }
+
+ MALLOC(devices_not_to_watch, dev_t *,
+ new_num_devices * sizeof(dev_t),
+ M_TEMP, M_WAITOK);
+ if (devices_not_to_watch == NULL) {
+ ret = ENOMEM;
+ break;
+ }
+
+ ret = copyin(devfilt_args->devices,
+ (void *)devices_not_to_watch,
+ new_num_devices * sizeof(dev_t));
+ if (ret) {
+ FREE(devices_not_to_watch, M_TEMP);
+ break;
+ }
+
+ lock_watch_table();
+ fseh->watcher->num_devices = new_num_devices;
+ tmp = fseh->watcher->devices_not_to_watch;
+ fseh->watcher->devices_not_to_watch = devices_not_to_watch;
+ unlock_watch_table();
+
+ if (tmp) {
+ FREE(tmp, M_TEMP);
+ }
+
+ break;
+ }
+
+ case FSEVENTS_UNMOUNT_PENDING_ACK: {
+ lock_watch_table();
+ dev_t dev = *(dev_t *)data;
+ if (fsevent_unmount_dev == dev) {
+ if (--fsevent_unmount_ack_count <= 0) {
+ fsevent_unmount_dev = 0;
+ wakeup((caddr_t)&fsevent_unmount_dev);
+ }
+ } else {
+ printf("unexpected unmount pending ack %d (%d)\n", dev, fsevent_unmount_dev);
+ ret = EINVAL;
+ }
+ unlock_watch_table();
+ break;
+ }
+
+ default:
+ ret = EINVAL;
+ break;
+ }
+
+ OSAddAtomic(-1, &fseh->active);
+ return ret;
+}
+
+
+static int
+fseventsf_select(struct fileproc *fp, int which, __unused void *wql, vfs_context_t ctx)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
+ int ready = 0;
+
+ if ((which != FREAD) || (fseh->watcher->flags & WATCHER_CLOSING)) {
+ return 0;
+ }
+
+
+ // if there's nothing in the queue, we're not ready
+ if (fseh->watcher->rd != fseh->watcher->wr) {
+ ready = 1;
+ }
+
+ if (!ready) {
+ selrecord(vfs_context_proc(ctx), &fseh->si, wql);
+ }
+
+ return ready;
+}
+
+
+#if NOTUSED
+static int
+fseventsf_stat(__unused struct fileproc *fp, __unused struct stat *sb, __unused vfs_context_t ctx)
+{
+ return ENOTSUP;
+}
+#endif
+
+static int
+fseventsf_close(struct fileglob *fg, __unused vfs_context_t ctx)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)fg->fg_data;
+ fs_event_watcher *watcher;
+
+ OSBitOrAtomic(FSEH_CLOSING, &fseh->flags);
+ while (OSAddAtomic(0, &fseh->active) > 0) {
+ tsleep((caddr_t)fseh->watcher, PRIBIO, "fsevents-close", 1);
+ }
+
+ watcher = fseh->watcher;
+ fg->fg_data = NULL;
+ fseh->watcher = NULL;
+
+ remove_watcher(watcher);
+ FREE(fseh, M_TEMP);
+
+ return 0;
+}
+
+static void
+filt_fsevent_detach(struct knote *kn)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)kn->kn_hook;
+
+ lock_watch_table();
+
+ KNOTE_DETACH(&fseh->knotes, kn);
+
+ unlock_watch_table();
+}
+
+/*
+ * Determine whether this knote should be active
+ *
+ * This is kind of subtle.
+ * --First, notice if the vnode has been revoked: in so, override hint
+ * --EVFILT_READ knotes are checked no matter what the hint is
+ * --Other knotes activate based on hint.
+ * --If hint is revoke, set special flags and activate
+ */
+static int
+filt_fsevent_common(struct knote *kn, struct kevent_qos_s *kev, long hint)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)kn->kn_hook;
+ int activate = 0;
+ int32_t rd, wr, amt;
+ int64_t data = 0;
+
+ if (NOTE_REVOKE == hint) {
+ kn->kn_flags |= (EV_EOF | EV_ONESHOT);
+ activate = 1;
+ }
+
+ rd = fseh->watcher->rd;
+ wr = fseh->watcher->wr;
+ if (rd <= wr) {
+ amt = wr - rd;
+ } else {
+ amt = fseh->watcher->eventq_size - (rd - wr);
+ }
+
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ data = amt;
+ activate = (data != 0);
+ break;
+ case EVFILT_VNODE:
+ /* Check events this note matches against the hint */
+ if (kn->kn_sfflags & hint) {
+ kn->kn_fflags |= hint; /* Set which event occurred */
+ }
+ if (kn->kn_fflags != 0) {
+ activate = 1;
+ }
+ break;
+ default:
+ // nothing to do...
+ break;
+ }
+
+ if (activate && kev) {
+ knote_fill_kevent(kn, kev, data);
+ }
+ return activate;
+}
+
+static int
+filt_fsevent(struct knote *kn, long hint)
+{
+ return filt_fsevent_common(kn, NULL, hint);
+}
+
+static int
+filt_fsevent_touch(struct knote *kn, struct kevent_qos_s *kev)
+{
+ int res;
+
+ lock_watch_table();
+
+ /* accept new fflags/data as saved */
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
+
+ /* restrict the current results to the (smaller?) set of new interest */
+ /*
+ * For compatibility with previous implementations, we leave kn_fflags
+ * as they were before.
+ */
+ //kn->kn_fflags &= kev->fflags;
+
+ /* determine if the filter is now fired */
+ res = filt_fsevent_common(kn, NULL, 0);
+
+ unlock_watch_table();
+
+ return res;
+}
+
+static int
+filt_fsevent_process(struct knote *kn, struct kevent_qos_s *kev)
+{
+ int res;
+
+ lock_watch_table();
+
+ res = filt_fsevent_common(kn, kev, 0);
+
+ unlock_watch_table();
+
+ return res;
+}
+
+SECURITY_READ_ONLY_EARLY(struct filterops) fsevent_filtops = {
+ .f_isfd = 1,
+ .f_attach = NULL,
+ .f_detach = filt_fsevent_detach,
+ .f_event = filt_fsevent,
+ .f_touch = filt_fsevent_touch,
+ .f_process = filt_fsevent_process,
+};
+
+static int
+fseventsf_kqfilter(struct fileproc *fp, struct knote *kn,
+ __unused struct kevent_qos_s *kev)
+{
+ fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
+ int res;
+
+ kn->kn_hook = (void*)fseh;
+ kn->kn_filtid = EVFILTID_FSEVENT;
+
+ lock_watch_table();
+
+ KNOTE_ATTACH(&fseh->knotes, kn);
+
+ /* check to see if it is fired already */
+ res = filt_fsevent_common(kn, NULL, 0);
+
+ unlock_watch_table();
+
+ return res;
+}
+
+
+static int
+fseventsf_drain(struct fileproc *fp, __unused vfs_context_t ctx)
+{
+ int counter = 0;
+ fsevent_handle *fseh = (struct fsevent_handle *)fp->f_fglob->fg_data;
+
+ // if there are people still waiting, sleep for 10ms to
+ // let them clean up and get out of there. however we
+ // also don't want to get stuck forever so if they don't
+ // exit after 5 seconds we're tearing things down anyway.
+ while (fseh->watcher->blockers && counter++ < 500) {
+ // issue wakeup in case anyone is blocked waiting for an event
+ // do this each time we wakeup in case the blocker missed
+ // the wakeup due to the unprotected test of WATCHER_CLOSING
+ // and decision to tsleep in fmod_watch... this bit of
+ // latency is a decent tradeoff against not having to
+ // take and drop a lock in fmod_watch
+ lock_watch_table();
+ fsevents_wakeup(fseh->watcher);
+ unlock_watch_table();
+
+ tsleep((caddr_t)fseh->watcher, PRIBIO, "watcher-close", 1);
+ }
+
+ return 0;
+}
+
+
+static int
+fseventsopen(__unused dev_t dev, __unused int flag, __unused int mode, __unused struct proc *p)
+{
+ if (!kauth_cred_issuser(kauth_cred_get())) {
+ return EPERM;
+ }
+
+ return 0;
+}
+
+static int
+fseventsclose(__unused dev_t dev, __unused int flag, __unused int mode, __unused struct proc *p)
+{
+ return 0;
+}
+
+static int
+fseventsread(__unused dev_t dev, __unused struct uio *uio, __unused int ioflag)
+{
+ return EIO;
+}
+
+
+static int
+parse_buffer_and_add_events(const char *buffer, int bufsize, vfs_context_t ctx, long *remainder)
+{
+ const fse_info *finfo, *dest_finfo;
+ const char *path, *ptr, *dest_path, *event_start = buffer;
+ int path_len, type, dest_path_len, err = 0;
+
+
+ ptr = buffer;
+ while ((ptr + sizeof(int) + sizeof(fse_info) + 1) < buffer + bufsize) {
+ type = *(const int *)ptr;
+ if (type < 0 || type >= FSE_MAX_EVENTS) {
+ err = EINVAL;
+ break;
+ }
+
+ ptr += sizeof(int);
+
+ finfo = (const fse_info *)ptr;
+ ptr += sizeof(fse_info);
+
+ path = ptr;
+ while (ptr < buffer + bufsize && *ptr != '\0') {
+ ptr++;
+ }
+
+ if (ptr >= buffer + bufsize) {
+ break;
+ }
+
+ ptr++; // advance over the trailing '\0'
+
+ path_len = ptr - path;
+
+ if (type != FSE_RENAME && type != FSE_EXCHANGE && type != FSE_CLONE) {
+ event_start = ptr; // record where the next event starts
+
+ err = add_fsevent(type, ctx, FSE_ARG_STRING, path_len, path, FSE_ARG_FINFO, finfo, FSE_ARG_DONE);
+ if (err) {
+ break;
+ }
+ continue;
+ }
+
+ //
+ // if we're here we have to slurp up the destination finfo
+ // and path so that we can pass them to the add_fsevent()
+ // call. basically it's a copy of the above code.
+ //
+ dest_finfo = (const fse_info *)ptr;
+ ptr += sizeof(fse_info);
+
+ dest_path = ptr;
+ while (ptr < buffer + bufsize && *ptr != '\0') {
+ ptr++;
+ }
+
+ if (ptr >= buffer + bufsize) {
+ break;
+ }
+
+ ptr++; // advance over the trailing '\0'
+ event_start = ptr; // record where the next event starts
+
+ dest_path_len = ptr - dest_path;
+ //
+ // If the destination inode number is non-zero, generate a rename
+ // with both source and destination FSE_ARG_FINFO. Otherwise generate
+ // a rename with only one FSE_ARG_FINFO. If you need to inject an
+ // exchange with an inode of zero, just make that inode (and its path)
+ // come in as the first one, not the second.
+ //
+ if (dest_finfo->ino) {
+ err = add_fsevent(type, ctx,
+ FSE_ARG_STRING, path_len, path, FSE_ARG_FINFO, finfo,
+ FSE_ARG_STRING, dest_path_len, dest_path, FSE_ARG_FINFO, dest_finfo,
+ FSE_ARG_DONE);
+ } else {
+ err = add_fsevent(type, ctx,
+ FSE_ARG_STRING, path_len, path, FSE_ARG_FINFO, finfo,
+ FSE_ARG_STRING, dest_path_len, dest_path,
+ FSE_ARG_DONE);
+ }
+
+ if (err) {
+ break;
+ }
+ }
+
+ // if the last event wasn't complete, set the remainder
+ // to be the last event start boundary.
+ //
+ *remainder = (long)((buffer + bufsize) - event_start);
+
+ return err;
+}
+
+
+//
+// Note: this buffer size can not ever be less than
+// 2*MAXPATHLEN + 2*sizeof(fse_info) + sizeof(int)
+// because that is the max size for a single event.
+// I made it 4k to be a "nice" size. making it
+// smaller is not a good idea.
+//
+#define WRITE_BUFFER_SIZE 4096
+char *write_buffer = NULL;
+
+static int
+fseventswrite(__unused dev_t dev, struct uio *uio, __unused int ioflag)
+{
+ int error = 0, count;
+ vfs_context_t ctx = vfs_context_current();
+ long offset = 0, remainder;
+
+ lck_mtx_lock(&event_writer_lock);
+
+ if (write_buffer == NULL) {
+ if (kmem_alloc(kernel_map, (vm_offset_t *)&write_buffer, WRITE_BUFFER_SIZE, VM_KERN_MEMORY_FILE)) {
+ lck_mtx_unlock(&event_writer_lock);
+ return ENOMEM;
+ }
+ }
+
+ //
+ // this loop copies in and processes the events written.
+ // it takes care to copy in reasonable size chunks and
+ // process them. if there is an event that spans a chunk
+ // boundary we're careful to copy those bytes down to the
+ // beginning of the buffer and read the next chunk in just
+ // after it.
+ //
+ while (uio_resid(uio)) {
+ if (uio_resid(uio) > (WRITE_BUFFER_SIZE - offset)) {
+ count = WRITE_BUFFER_SIZE - offset;
+ } else {
+ count = uio_resid(uio);
+ }
+
+ error = uiomove(write_buffer + offset, count, uio);
+ if (error) {
+ break;
+ }
+
+ // printf("fsevents: write: copied in %d bytes (offset: %ld)\n", count, offset);
+ error = parse_buffer_and_add_events(write_buffer, offset + count, ctx, &remainder);
+ if (error) {
+ break;
+ }
+
+ //
+ // if there's any remainder, copy it down to the beginning
+ // of the buffer so that it will get processed the next time
+ // through the loop. note that the remainder always starts
+ // at an event boundary.
+ //
+ if (remainder != 0) {
+ // printf("fsevents: write: an event spanned a %d byte boundary. remainder: %ld\n",
+ // WRITE_BUFFER_SIZE, remainder);
+ memmove(write_buffer, (write_buffer + count + offset) - remainder, remainder);
+ offset = remainder;
+ } else {
+ offset = 0;
+ }
+ }
+
+ lck_mtx_unlock(&event_writer_lock);
+
+ return error;
+}
+
+
+static const struct fileops fsevents_fops = {
+ .fo_type = DTYPE_FSEVENTS,
+ .fo_read = fseventsf_read,
+ .fo_write = fo_no_write,
+ .fo_ioctl = fseventsf_ioctl,
+ .fo_select = fseventsf_select,
+ .fo_close = fseventsf_close,
+ .fo_kqfilter = fseventsf_kqfilter,
+ .fo_drain = fseventsf_drain,
+};
+
+typedef struct fsevent_clone_args32 {
+ user32_addr_t event_list;
+ int32_t num_events;
+ int32_t event_queue_depth;
+ user32_addr_t fd;
+} fsevent_clone_args32;
+
+typedef struct fsevent_clone_args64 {
+ user64_addr_t event_list;
+ int32_t num_events;
+ int32_t event_queue_depth;
+ user64_addr_t fd;
+} fsevent_clone_args64;
+
+#define FSEVENTS_CLONE_32 _IOW('s', 1, fsevent_clone_args32)
+#define FSEVENTS_CLONE_64 _IOW('s', 1, fsevent_clone_args64)
+
+static int
+fseventsioctl(__unused dev_t dev, u_long cmd, caddr_t data, __unused int flag, struct proc *p)
{
- wakeup((caddr_t)fseh);
- selwakeup(&fseh->si);
+ struct fileproc *f;
+ int fd, error;
+ fsevent_handle *fseh = NULL;
+ fsevent_clone_args64 *fse_clone_args, _fse_clone;
+ int8_t *event_list;
+ int is64bit = proc_is64bit(p);
+
+ switch (cmd) {
+ case FSEVENTS_CLONE_32: {
+ if (is64bit) {
+ return EINVAL;
+ }
+ fsevent_clone_args32 *args32 = (fsevent_clone_args32 *)data;
+
+ fse_clone_args = &_fse_clone;
+ memset(fse_clone_args, 0, sizeof(fsevent_clone_args64));
+
+ fse_clone_args->event_list = CAST_USER_ADDR_T(args32->event_list);
+ fse_clone_args->num_events = args32->num_events;
+ fse_clone_args->event_queue_depth = args32->event_queue_depth;
+ fse_clone_args->fd = CAST_USER_ADDR_T(args32->fd);
+ goto handle_clone;
+ }
+
+ case FSEVENTS_CLONE_64:
+ if (!is64bit) {
+ return EINVAL;
+ }
+ fse_clone_args = (fsevent_clone_args64 *)data;
+
+handle_clone:
+ if (fse_clone_args->num_events < 0 || fse_clone_args->num_events > 4096) {
+ return EINVAL;
+ }
+
+ MALLOC(fseh, fsevent_handle *, sizeof(fsevent_handle),
+ M_TEMP, M_WAITOK);
+ if (fseh == NULL) {
+ return ENOMEM;
+ }
+ memset(fseh, 0, sizeof(fsevent_handle));
+
+ klist_init(&fseh->knotes);
+
+ MALLOC(event_list, int8_t *,
+ fse_clone_args->num_events * sizeof(int8_t),
+ M_TEMP, M_WAITOK);
+ if (event_list == NULL) {
+ FREE(fseh, M_TEMP);
+ return ENOMEM;
+ }
+
+ error = copyin(fse_clone_args->event_list,
+ (void *)event_list,
+ fse_clone_args->num_events * sizeof(int8_t));
+ if (error) {
+ FREE(event_list, M_TEMP);
+ FREE(fseh, M_TEMP);
+ return error;
+ }
+
+ /*
+ * Lock down the user's "fd" result buffer so it's safe
+ * to hold locks while we copy it out.
+ */
+ error = vslock((user_addr_t)fse_clone_args->fd,
+ sizeof(int32_t));
+ if (error) {
+ FREE(event_list, M_TEMP);
+ FREE(fseh, M_TEMP);
+ return error;
+ }
+
+ error = add_watcher(event_list,
+ fse_clone_args->num_events,
+ fse_clone_args->event_queue_depth,
+ &fseh->watcher,
+ fseh);
+ if (error) {
+ vsunlock((user_addr_t)fse_clone_args->fd,
+ sizeof(int32_t), 0);
+ FREE(event_list, M_TEMP);
+ FREE(fseh, M_TEMP);
+ return error;
+ }
+
+ fseh->watcher->fseh = fseh;
+
+ error = falloc(p, &f, &fd, vfs_context_current());
+ if (error) {
+ remove_watcher(fseh->watcher);
+ vsunlock((user_addr_t)fse_clone_args->fd,
+ sizeof(int32_t), 0);
+ FREE(event_list, M_TEMP);
+ FREE(fseh, M_TEMP);
+ return error;
+ }
+ proc_fdlock(p);
+ f->f_fglob->fg_flag = FREAD | FWRITE;
+ f->f_fglob->fg_ops = &fsevents_fops;
+ f->f_fglob->fg_data = (caddr_t) fseh;
+ /*
+ * We can safely hold the proc_fdlock across this copyout()
+ * because of the vslock() call above. The vslock() call
+ * also ensures that we will never get an error, so assert
+ * this.
+ */
+ error = copyout((void *)&fd, fse_clone_args->fd, sizeof(int32_t));
+ assert(error == 0);
+
+ procfdtbl_releasefd(p, fd, NULL);
+ fp_drop(p, fd, f, 1);
+ proc_fdunlock(p);
+
+ vsunlock((user_addr_t)fse_clone_args->fd,
+ sizeof(int32_t), 1);
+ break;
+
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ return error;
+}
+
+static void
+fsevents_wakeup(fs_event_watcher *watcher)
+{
+ selwakeup(&watcher->fseh->si);
+ KNOTE(&watcher->fseh->knotes, NOTE_WRITE | NOTE_NONE);
+ wakeup((caddr_t)watcher);
}
@@ -1249,20 +2453,20 @@ fsevents_wakeup(fsevent_handle *fseh)
*/
static struct cdevsw fsevents_cdevsw =
{
- fseventsopen, /* open */
- fseventsclose, /* close */
- fseventsread, /* read */
- fseventswrite, /* write */
- fseventsioctl, /* ioctl */
- nulldev, /* stop */
- nulldev, /* reset */
- NULL, /* tty's */
- eno_select, /* select */
- eno_mmap, /* mmap */
- eno_strat, /* strategy */
- eno_getc, /* getc */
- eno_putc, /* putc */
- 0 /* type */
+ fseventsopen, /* open */
+ fseventsclose, /* close */
+ fseventsread, /* read */
+ fseventswrite, /* write */
+ fseventsioctl, /* ioctl */
+ (stop_fcn_t *)&nulldev, /* stop */
+ (reset_fcn_t *)&nulldev, /* reset */
+ NULL, /* tty's */
+ eno_select, /* select */
+ eno_mmap, /* mmap */
+ eno_strat, /* strategy */
+ eno_getc, /* getc */
+ eno_putc, /* putc */
+ 0 /* type */
};
@@ -1274,135 +2478,179 @@ static struct cdevsw fsevents_cdevsw =
void
fsevents_init(void)
{
- int ret;
-
- if (fsevents_installed) {
- return;
- }
+ int ret;
- fsevents_installed = 1;
+ if (fsevents_installed) {
+ return;
+ }
- lockinit(&fsevents_lck, PLOCK, "fsevents", 0, 0);
+ fsevents_installed = 1;
- ret = cdevsw_add(-1, &fsevents_cdevsw);
- if (ret < 0) {
- fsevents_installed = 0;
- return;
- }
+ ret = cdevsw_add(-1, &fsevents_cdevsw);
+ if (ret < 0) {
+ fsevents_installed = 0;
+ return;
+ }
- devfs_make_node(makedev (ret, 0), DEVFS_CHAR,
- UID_ROOT, GID_WHEEL, 0644, "fsevents", 0);
+ devfs_make_node(makedev(ret, 0), DEVFS_CHAR,
+ UID_ROOT, GID_WHEEL, 0644, "fsevents", 0);
- fsevents_internal_init();
+ fsevents_internal_init();
}
+char *
+get_pathbuff(void)
+{
+ char *path;
-//
-// XXXdbg - temporary path buffer handling
-//
-#define NUM_PATH_BUFFS 16
-static char path_buff[NUM_PATH_BUFFS][MAXPATHLEN];
-static char path_buff_inuse[NUM_PATH_BUFFS];
+ MALLOC_ZONE(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ return path;
+}
-static lck_grp_attr_t * pathbuff_group_attr;
-static lck_attr_t * pathbuff_lock_attr;
-static lck_grp_t * pathbuff_mutex_group;
-static lck_mtx_t pathbuff_lock;
+void
+release_pathbuff(char *path)
+{
+ if (path == NULL) {
+ return;
+ }
+ FREE_ZONE(path, MAXPATHLEN, M_NAMEI);
+}
-static void
-init_pathbuff(void)
+int
+get_fse_info(struct vnode *vp, fse_info *fse, __unused vfs_context_t ctx)
{
- pathbuff_lock_attr = lck_attr_alloc_init();
- pathbuff_group_attr = lck_grp_attr_alloc_init();
- pathbuff_mutex_group = lck_grp_alloc_init("pathbuff-mutex", pathbuff_group_attr);
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_fsid);
+ va.va_vaflags |= VA_REALFSID;
+ VATTR_WANTED(&va, va_fileid);
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ if (vp->v_flag & VISHARDLINK) {
+ if (vp->v_type == VDIR) {
+ VATTR_WANTED(&va, va_dirlinkcount);
+ } else {
+ VATTR_WANTED(&va, va_nlink);
+ }
+ }
+
+ if (vnode_getattr(vp, &va, vfs_context_kernel()) != 0) {
+ memset(fse, 0, sizeof(fse_info));
+ return -1;
+ }
- lck_mtx_init(&pathbuff_lock, pathbuff_mutex_group, pathbuff_lock_attr);
+ return vnode_get_fse_info_from_vap(vp, fse, &va);
}
-static void
-lock_pathbuff(void)
+int
+vnode_get_fse_info_from_vap(vnode_t vp, fse_info *fse, struct vnode_attr *vap)
{
- lck_mtx_lock(&pathbuff_lock);
+ fse->ino = (ino64_t)vap->va_fileid;
+ fse->dev = (dev_t)vap->va_fsid;
+ fse->mode = (int32_t)vnode_vttoif(vnode_vtype(vp)) | vap->va_mode;
+ fse->uid = (uid_t)vap->va_uid;
+ fse->gid = (gid_t)vap->va_gid;
+ if (vp->v_flag & VISHARDLINK) {
+ fse->mode |= FSE_MODE_HLINK;
+ if (vp->v_type == VDIR) {
+ fse->nlink = (uint64_t)vap->va_dirlinkcount;
+ } else {
+ fse->nlink = (uint64_t)vap->va_nlink;
+ }
+ }
+
+ return 0;
}
-static void
-unlock_pathbuff(void)
+void
+create_fsevent_from_kevent(vnode_t vp, uint32_t kevents, struct vnode_attr *vap)
{
- lck_mtx_unlock(&pathbuff_lock);
+ int fsevent_type = FSE_CONTENT_MODIFIED, len; // the default is the most pessimistic
+ char pathbuf[MAXPATHLEN];
+ fse_info fse;
+
+
+ if (kevents & VNODE_EVENT_DELETE) {
+ fsevent_type = FSE_DELETE;
+ } else if (kevents & (VNODE_EVENT_EXTEND | VNODE_EVENT_WRITE)) {
+ fsevent_type = FSE_CONTENT_MODIFIED;
+ } else if (kevents & VNODE_EVENT_LINK) {
+ fsevent_type = FSE_CREATE_FILE;
+ } else if (kevents & VNODE_EVENT_RENAME) {
+ fsevent_type = FSE_CREATE_FILE; // XXXdbg - should use FSE_RENAME but we don't have the destination info;
+ } else if (kevents & (VNODE_EVENT_FILE_CREATED | VNODE_EVENT_FILE_REMOVED | VNODE_EVENT_DIR_CREATED | VNODE_EVENT_DIR_REMOVED)) {
+ fsevent_type = FSE_STAT_CHANGED; // XXXdbg - because vp is a dir and the thing created/removed lived inside it
+ } else { // a catch all for VNODE_EVENT_PERMS, VNODE_EVENT_ATTRIB and anything else
+ fsevent_type = FSE_STAT_CHANGED;
+ }
+
+ // printf("convert_kevent: kevents 0x%x fsevent type 0x%x (for %s)\n", kevents, fsevent_type, vp->v_name ? vp->v_name : "(no-name)");
+
+ fse.dev = vap->va_fsid;
+ fse.ino = vap->va_fileid;
+ fse.mode = vnode_vttoif(vnode_vtype(vp)) | (uint32_t)vap->va_mode;
+ if (vp->v_flag & VISHARDLINK) {
+ fse.mode |= FSE_MODE_HLINK;
+ if (vp->v_type == VDIR) {
+ fse.nlink = vap->va_dirlinkcount;
+ } else {
+ fse.nlink = vap->va_nlink;
+ }
+ }
+
+ if (vp->v_type == VDIR) {
+ fse.mode |= FSE_REMOTE_DIR_EVENT;
+ }
+
+
+ fse.uid = vap->va_uid;
+ fse.gid = vap->va_gid;
+
+ len = sizeof(pathbuf);
+ if (vn_getpath_no_firmlink(vp, pathbuf, &len) == 0) {
+ add_fsevent(fsevent_type, vfs_context_current(), FSE_ARG_STRING, len, pathbuf, FSE_ARG_FINFO, &fse, FSE_ARG_DONE);
+ }
+ return;
}
+#else /* CONFIG_FSE */
+#include <sys/fsevents.h>
+
+/*
+ * The get_pathbuff and release_pathbuff routines are used in places not
+ * related to fsevents, and it's a handy abstraction, so define trivial
+ * versions that don't cache a pool of buffers. This way, we don't have
+ * to conditionalize the callers, and they still get the advantage of the
+ * pool of buffers if CONFIG_FSE is turned on.
+ */
char *
get_pathbuff(void)
{
- int i;
-
- lock_pathbuff();
- for(i=0; i < NUM_PATH_BUFFS; i++) {
- if (path_buff_inuse[i] == 0) {
- break;
- }
- }
-
- if (i >= NUM_PATH_BUFFS) {
char *path;
-
- unlock_pathbuff();
MALLOC_ZONE(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
return path;
- }
-
- path_buff_inuse[i] = 1;
- unlock_pathbuff();
- return &path_buff[i][0];
}
void
release_pathbuff(char *path)
{
- int i;
-
- if (path == NULL) {
- return;
- }
-
- lock_pathbuff();
- for(i=0; i < NUM_PATH_BUFFS; i++) {
- if (path == &path_buff[i][0]) {
- path_buff[i][0] = '\0';
- path_buff_inuse[i] = 0;
- unlock_pathbuff();
- return;
- }
- }
-
- unlock_pathbuff();
+ FREE_ZONE(path, MAXPATHLEN, M_NAMEI);
+}
- // if we get here then it wasn't one of our temp buffers
- FREE_ZONE(path, MAXPATHLEN, M_NAMEI);
+int
+add_fsevent(__unused int type, __unused vfs_context_t ctx, ...)
+{
+ return 0;
}
int
-get_fse_info(struct vnode *vp, fse_info *fse, vfs_context_t ctx)
+need_fsevent(__unused int type, __unused vnode_t vp)
{
- struct vnode_attr va;
-
- VATTR_INIT(&va);
- VATTR_WANTED(&va, va_fsid);
- VATTR_WANTED(&va, va_fileid);
- VATTR_WANTED(&va, va_mode);
- VATTR_WANTED(&va, va_uid);
- VATTR_WANTED(&va, va_gid);
- if (vnode_getattr(vp, &va, ctx) != 0) {
- return -1;
- }
-
- fse->dev = (dev_t)va.va_fsid;
- fse->ino = (ino_t)va.va_fileid;
- fse->mode = (int32_t)vnode_vttoif(vnode_vtype(vp)) | va.va_mode;
- fse->uid = (uid_t)va.va_uid;
- fse->gid = (gid_t)va.va_gid;
-
- return 0;
+ return 0;
}
+
+#endif /* CONFIG_FSE */