/*
- * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <sys/param.h>
+#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kauth.h>
static lck_grp_t *nfs_node_hash_lck_grp;
static lck_grp_t *nfs_node_lck_grp;
+static lck_grp_t *nfs_data_lck_grp;
lck_mtx_t *nfs_node_hash_mutex;
/*
nfs_node_hash_lck_grp = lck_grp_alloc_init("nfs_node_hash", LCK_GRP_ATTR_NULL);
nfs_node_hash_mutex = lck_mtx_alloc_init(nfs_node_hash_lck_grp, LCK_ATTR_NULL);
nfs_node_lck_grp = lck_grp_alloc_init("nfs_node", LCK_GRP_ATTR_NULL);
+ nfs_data_lck_grp = lck_grp_alloc_init("nfs_data", LCK_GRP_ATTR_NULL);
}
void
continue;
FSDBG(263, dnp, np, np->n_flag, 0xcace0000);
/* if the node is locked, sleep on it */
- if (np->n_hflag & NHLOCKED) {
+ if ((np->n_hflag & NHLOCKED) && !(flags & NG_NOCREATE)) {
np->n_hflag |= NHLOCKWANT;
FSDBG(263, dnp, np, np->n_flag, 0xcace2222);
msleep(np, nfs_node_hash_mutex, PDROP | PINOD, "nfs_nget", NULL);
FSDBG_BOT(263, dnp, *npp, 0xcace0d1e, error);
return (error);
}
- if ((error = nfs_lock(np, NFS_NODE_LOCK_EXCLUSIVE))) {
+ if ((error = nfs_node_lock(np))) {
/* this only fails if the node is now unhashed */
/* so let's see if we can find/create it again */
FSDBG(263, dnp, *npp, 0xcaced1e2, error);
vnode_put(vp);
+ if (flags & NG_NOCREATE) {
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0xcaced1e0, ENOENT);
+ return (ENOENT);
+ }
goto loop;
}
/* update attributes */
- error = nfs_loadattrcache(np, nvap, xidp, 0);
+ if (nvap)
+ error = nfs_loadattrcache(np, nvap, xidp, 0);
if (error) {
- nfs_unlock(np);
+ nfs_node_unlock(np);
vnode_put(vp);
} else {
if (dnp && cnp && (flags & NG_MAKEENTRY))
FSDBG(263, mp, dnp, npp, 0xaaaaaaaa);
+ if (flags & NG_NOCREATE) {
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000001, ENOENT);
+ return (ENOENT);
+ }
+
/*
* allocate and initialize nfsnode and stick it in the hash
* before calling getnewvnode(). Anyone finding it in the
bzero(np, sizeof *np);
np->n_hflag |= (NHINIT | NHLOCKED);
np->n_mount = mp;
+ TAILQ_INIT(&np->n_opens);
+ TAILQ_INIT(&np->n_lock_owners);
+ TAILQ_INIT(&np->n_locks);
+ np->n_dlink.tqe_next = NFSNOLIST;
if (dnp && cnp && ((cnp->cn_namelen != 2) ||
(cnp->cn_nameptr[0] != '.') || (cnp->cn_nameptr[1] != '.'))) {
FSDBG(266, 0, np, np->n_flag, np->n_hflag);
/* lock the new nfsnode */
- lck_rw_init(&np->n_lock, nfs_node_lck_grp, LCK_ATTR_NULL);
- lck_rw_init(&np->n_datalock, nfs_node_lck_grp, LCK_ATTR_NULL);
- nfs_lock(np, NFS_NODE_LOCK_FORCE);
+ lck_mtx_init(&np->n_lock, nfs_node_lck_grp, LCK_ATTR_NULL);
+ lck_rw_init(&np->n_datalock, nfs_data_lck_grp, LCK_ATTR_NULL);
+ lck_mtx_init(&np->n_openlock, nfs_open_grp, LCK_ATTR_NULL);
+ lck_mtx_lock(&np->n_lock);
/* release lock on hash table */
lck_mtx_unlock(nfs_node_hash_mutex);
error = nfs_loadattrcache(np, nvap, xidp, 1);
if (error) {
FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
- nfs_unlock(np);
+ nfs_node_unlock(np);
lck_mtx_lock(nfs_node_hash_mutex);
LIST_REMOVE(np, n_hash);
np->n_hflag &= ~(NHHASHED|NHINIT|NHLOCKED);
}
np->n_parent = NULL;
}
- lck_rw_destroy(&np->n_lock, nfs_node_lck_grp);
- lck_rw_destroy(&np->n_datalock, nfs_node_lck_grp);
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
if (np->n_fhsize > NFS_SMALLFH)
FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
FREE_ZONE(np, sizeof *np, M_NFSNODE);
error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, &np->n_vnode);
if (error) {
FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
- nfs_unlock(np);
+ nfs_node_unlock(np);
lck_mtx_lock(nfs_node_hash_mutex);
LIST_REMOVE(np, n_hash);
np->n_hflag &= ~(NHHASHED|NHINIT|NHLOCKED);
}
np->n_parent = NULL;
}
- lck_rw_destroy(&np->n_lock, nfs_node_lck_grp);
- lck_rw_destroy(&np->n_datalock, nfs_node_lck_grp);
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
if (np->n_fhsize > NFS_SMALLFH)
FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
FREE_ZONE(np, sizeof *np, M_NFSNODE);
vfs_context_t a_context;
} */ *ap;
{
- vnode_t vp;
- nfsnode_t np;
+ vnode_t vp = ap->a_vp;
+ vfs_context_t ctx = ap->a_context;
+ nfsnode_t np = VTONFS(ap->a_vp);
struct nfs_sillyrename *nsp;
struct nfs_vattr nvattr;
- int unhash, attrerr;
+ int unhash, attrerr, busyerror, error, inuse, busied;
+ struct nfs_open_file *nofp;
+ const char *vname = NULL;
+ struct componentname cn;
+ struct nfsmount *nmp = NFSTONMP(np);
+
+restart:
+ error = 0;
+ inuse = ((nmp->nm_vers >= NFS_VER4) && (nfs_mount_state_in_use_start(nmp) == 0));
+
+ /* There shouldn't be any open or lock state at this point */
+ lck_mtx_lock(&np->n_openlock);
+ if (np->n_openrefcnt) {
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: still open: %d %s\n", np->n_openrefcnt, vname ? vname : "//");
+ }
+ TAILQ_FOREACH(nofp, &np->n_opens, nof_link) {
+ lck_mtx_lock(&nofp->nof_lock);
+ if (nofp->nof_flags & NFS_OPEN_FILE_BUSY) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: open file busy: %s\n", vname ? vname : "//");
+ busied = 0;
+ } else {
+ nofp->nof_flags |= NFS_OPEN_FILE_BUSY;
+ busied = 1;
+ }
+ lck_mtx_unlock(&nofp->nof_lock);
+ /*
+ * If we just created the file, we already had it open in
+ * anticipation of getting a subsequent open call. If the
+ * node has gone inactive without being open, we need to
+ * clean up (close) the open done in the create.
+ */
+ if ((nofp->nof_flags & NFS_OPEN_FILE_CREATE) && nofp->nof_creator) {
+ if (nofp->nof_flags & NFS_OPEN_FILE_REOPEN) {
+ lck_mtx_unlock(&np->n_openlock);
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, 0);
+ nfs4_reopen(nofp, vfs_context_thread(ctx));
+ goto restart;
+ }
+ nofp->nof_flags &= ~NFS_OPEN_FILE_CREATE;
+ lck_mtx_unlock(&np->n_openlock);
+ error = nfs4_close(np, nofp, NFS_OPEN_SHARE_ACCESS_BOTH, NFS_OPEN_SHARE_DENY_NONE, ctx);
+ if (error) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: create close error: %d, %s\n", error, vname);
+ nofp->nof_flags |= NFS_OPEN_FILE_CREATE;
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, error);
+ goto restart;
+ }
+ if (nofp->nof_flags & NFS_OPEN_FILE_NEEDCLOSE) {
+ /*
+ * If the file is marked as needing reopen, but this was the only
+ * open on the file, just drop the open.
+ */
+ nofp->nof_flags &= ~NFS_OPEN_FILE_NEEDCLOSE;
+ if ((nofp->nof_flags & NFS_OPEN_FILE_REOPEN) && (nofp->nof_opencnt == 1)) {
+ nofp->nof_flags &= ~NFS_OPEN_FILE_REOPEN;
+ nofp->nof_r--;
+ nofp->nof_opencnt--;
+ nofp->nof_access = 0;
+ } else {
+ lck_mtx_unlock(&np->n_openlock);
+ if (nofp->nof_flags & NFS_OPEN_FILE_REOPEN) {
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, 0);
+ nfs4_reopen(nofp, vfs_context_thread(ctx));
+ goto restart;
+ }
+ error = nfs4_close(np, nofp, NFS_OPEN_SHARE_ACCESS_READ, NFS_OPEN_SHARE_DENY_NONE, ctx);
+ if (error) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: need close error: %d, %s\n", error, vname);
+ nofp->nof_flags |= NFS_OPEN_FILE_NEEDCLOSE;
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, error);
+ goto restart;
+ }
+ }
+ if (nofp->nof_opencnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: file still open: %d %s\n", nofp->nof_opencnt, vname ? vname : "//");
+ }
+ if (nofp->nof_access || nofp->nof_deny ||
+ nofp->nof_mmap_access || nofp->nof_mmap_deny ||
+ nofp->nof_r || nofp->nof_w || nofp->nof_rw ||
+ nofp->nof_r_dw || nofp->nof_w_dw || nofp->nof_rw_dw ||
+ nofp->nof_r_drw || nofp->nof_w_drw || nofp->nof_rw_drw) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: non-zero access: %d %d %d %d # %u %u %u dw %u %u %u drw %u %u %u %s\n",
+ nofp->nof_access, nofp->nof_deny,
+ nofp->nof_mmap_access, nofp->nof_mmap_deny,
+ nofp->nof_r, nofp->nof_w, nofp->nof_rw,
+ nofp->nof_r_dw, nofp->nof_w_dw, nofp->nof_rw_dw,
+ nofp->nof_r_drw, nofp->nof_w_drw, nofp->nof_rw_drw,
+ vname ? vname : "//");
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ }
+ lck_mtx_unlock(&np->n_openlock);
+ if (vname)
+ vnode_putname(vname);
- vp = ap->a_vp;
- np = VTONFS(ap->a_vp);
+ if (inuse && nfs_mount_state_in_use_end(nmp, error))
+ goto restart;
- nfs_lock(np, NFS_NODE_LOCK_FORCE);
+ nfs_node_lock_force(np);
if (vnode_vtype(vp) != VDIR) {
- nsp = np->n_sillyrename;
+ nsp = np->n_sillyrename;
np->n_sillyrename = NULL;
- } else
+ } else {
nsp = NULL;
+ }
FSDBG_TOP(264, vp, np, np->n_flag, nsp);
/* no silly file to clean up... */
/* clear all flags other than these */
np->n_flag &= (NMODIFIED);
- nfs_unlock(np);
+ nfs_node_unlock(np);
FSDBG_BOT(264, vp, np, np->n_flag, 0);
return (0);
}
+ nfs_node_unlock(np);
/* Remove the silly file that was rename'd earlier */
/* flush all the buffers */
- nfs_unlock(np);
- nfs_vinvalbuf2(vp, V_SAVE, vfs_context_thread(ap->a_context), nsp->nsr_cred, 1);
-
- /* purge the name cache to deter others from finding it */
- cache_purge(vp);
+ nfs_vinvalbuf2(vp, V_SAVE, vfs_context_thread(ctx), nsp->nsr_cred, 1);
/* try to get the latest attributes */
- attrerr = nfs_getattr(np, &nvattr, ap->a_context, 0);
+ attrerr = nfs_getattr(np, &nvattr, ctx, NGA_UNCACHED);
/* Check if we should remove it from the node hash. */
/* Leave it if inuse or it has multiple hard links. */
ubc_setsize(vp, 0);
}
- /* grab node lock on this node and the directory */
- nfs_lock2(nsp->nsr_dnp, np, NFS_NODE_LOCK_FORCE);
+ /* mark this node and the directory busy while we do the remove */
+ busyerror = nfs_node_set_busy2(nsp->nsr_dnp, np, vfs_context_thread(ctx));
/* lock the node while we remove the silly file */
lck_mtx_lock(nfs_node_hash_mutex);
np->n_hflag |= NHLOCKED;
lck_mtx_unlock(nfs_node_hash_mutex);
- /* purge again in case it was looked up while we were locking */
- cache_purge(vp);
+ /* purge the name cache to deter others from finding it */
+ bzero(&cn, sizeof(cn));
+ cn.cn_nameptr = nsp->nsr_name;
+ cn.cn_namelen = nsp->nsr_namlen;
+ nfs_name_cache_purge(nsp->nsr_dnp, np, &cn, ctx);
FSDBG(264, np, np->n_size, np->n_vattr.nva_size, 0xf00d00f1);
nfs_removeit(nsp);
/* clear all flags other than these */
+ nfs_node_lock_force(np);
np->n_flag &= (NMODIFIED);
- nfs_unlock2(nsp->nsr_dnp, np);
+ nfs_node_unlock(np);
+
+ if (!busyerror)
+ nfs_node_clear_busy2(nsp->nsr_dnp, np);
if (unhash && vnode_isinuse(vp, 0)) {
/* vnode now inuse after silly remove? */
{
vnode_t vp = ap->a_vp;
nfsnode_t np = VTONFS(vp);
- struct nfsdmap *dp, *dp2;
+ vfs_context_t ctx = ap->a_context;
+ struct nfs_open_file *nofp, *nextnofp;
+ struct nfs_file_lock *nflp, *nextnflp;
+ struct nfs_lock_owner *nlop, *nextnlop;
+ const char *vname = NULL;
+ struct nfsmount *nmp = np->n_mount ? VFSTONFS(np->n_mount) : NFSTONMP(np);
FSDBG_TOP(265, vp, np, np->n_flag, 0);
+ /* There shouldn't be any open or lock state at this point */
+ lck_mtx_lock(&np->n_openlock);
+
+ if (nmp && (nmp->nm_vers >= NFS_VER4)) {
+ /* need to drop a delegation */
+ if (np->n_dlink.tqe_next != NFSNOLIST) {
+ /* remove this node from the recall list */
+ lck_mtx_lock(&nmp->nm_lock);
+ if (np->n_dlink.tqe_next != NFSNOLIST) {
+ TAILQ_REMOVE(&nmp->nm_recallq, np, n_dlink);
+ np->n_dlink.tqe_next = NFSNOLIST;
+ }
+ lck_mtx_unlock(&nmp->nm_lock);
+ }
+ if (np->n_openflags & N_DELEG_MASK) {
+ np->n_openflags &= ~N_DELEG_MASK;
+ nfs4_delegreturn_rpc(nmp, np->n_fhp, np->n_fhsize, &np->n_dstateid,
+ vfs_context_thread(ctx), vfs_context_ucred(ctx));
+ }
+ }
+
+ /* clean up file locks */
+ TAILQ_FOREACH_SAFE(nflp, &np->n_locks, nfl_link, nextnflp) {
+ if (!(nflp->nfl_flags & NFS_FILE_LOCK_DEAD)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: lock 0x%llx 0x%llx 0x%x (bc %d) %s\n",
+ nflp->nfl_start, nflp->nfl_end, nflp->nfl_flags,
+ nflp->nfl_blockcnt, vname ? vname : "//");
+ }
+ if (!(nflp->nfl_flags & NFS_FILE_LOCK_BLOCKED)) {
+ lck_mtx_lock(&nflp->nfl_owner->nlo_lock);
+ TAILQ_REMOVE(&nflp->nfl_owner->nlo_locks, nflp, nfl_lolink);
+ lck_mtx_unlock(&nflp->nfl_owner->nlo_lock);
+ }
+ TAILQ_REMOVE(&np->n_locks, nflp, nfl_link);
+ nfs_file_lock_destroy(nflp);
+ }
+ /* clean up lock owners */
+ TAILQ_FOREACH_SAFE(nlop, &np->n_lock_owners, nlo_link, nextnlop) {
+ if (!TAILQ_EMPTY(&nlop->nlo_locks)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: lock owner with locks %s\n",
+ vname ? vname : "//");
+ }
+ TAILQ_REMOVE(&np->n_lock_owners, nlop, nlo_link);
+ nfs_lock_owner_destroy(nlop);
+ }
+ /* clean up open state */
+ if (np->n_openrefcnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: still open: %d %s\n",
+ np->n_openrefcnt, vname ? vname : "//");
+ }
+ TAILQ_FOREACH_SAFE(nofp, &np->n_opens, nof_link, nextnofp) {
+ if (nofp->nof_flags & NFS_OPEN_FILE_BUSY) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: open file busy: %s\n",
+ vname ? vname : "//");
+ }
+ if (nofp->nof_opencnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: file still open: %d %s\n",
+ nofp->nof_opencnt, vname ? vname : "//");
+ }
+ if (nofp->nof_access || nofp->nof_deny ||
+ nofp->nof_mmap_access || nofp->nof_mmap_deny ||
+ nofp->nof_r || nofp->nof_w || nofp->nof_rw ||
+ nofp->nof_r_dw || nofp->nof_w_dw || nofp->nof_rw_dw ||
+ nofp->nof_r_drw || nofp->nof_w_drw || nofp->nof_rw_drw) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: non-zero access: %d %d %d %d # %u %u %u dw %u %u %u drw %u %u %u %s\n",
+ nofp->nof_access, nofp->nof_deny,
+ nofp->nof_mmap_access, nofp->nof_mmap_deny,
+ nofp->nof_r, nofp->nof_w, nofp->nof_rw,
+ nofp->nof_r_dw, nofp->nof_w_dw, nofp->nof_rw_dw,
+ nofp->nof_r_drw, nofp->nof_w_drw, nofp->nof_rw_drw,
+ vname ? vname : "//");
+ }
+ TAILQ_REMOVE(&np->n_opens, nofp, nof_link);
+ nfs_open_file_destroy(nofp);
+ }
+ lck_mtx_unlock(&np->n_openlock);
+
+ lck_mtx_lock(nfs_buf_mutex);
+ if (!LIST_EMPTY(&np->n_dirtyblkhd) || !LIST_EMPTY(&np->n_cleanblkhd)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_reclaim: dropping %s buffers for file %s\n",
+ (!LIST_EMPTY(&np->n_dirtyblkhd) ? "dirty" : "clean"),
+ (vname ? vname : "//"));
+ }
+ lck_mtx_unlock(nfs_buf_mutex);
+ if (vname)
+ vnode_putname(vname);
+ nfs_vinvalbuf(vp, V_IGNORE_WRITEERR, ap->a_context, 0);
+
lck_mtx_lock(nfs_node_hash_mutex);
- if ((vnode_vtype(vp) != VDIR) && np->n_sillyrename)
+ if ((vnode_vtype(vp) != VDIR) && np->n_sillyrename) {
printf("nfs_reclaim: leaving unlinked file %s\n", np->n_sillyrename->nsr_name);
+ if (np->n_sillyrename->nsr_cred != NOCRED)
+ kauth_cred_unref(&np->n_sillyrename->nsr_cred);
+ vnode_rele(NFSTOV(np->n_sillyrename->nsr_dnp));
+ FREE_ZONE(np->n_sillyrename, sizeof(*np->n_sillyrename), M_NFSREQ);
+ }
vnode_removefsref(vp);
lck_mtx_unlock(nfs_node_hash_mutex);
/*
- * Free up any directory cookie structures and
- * large file handle structures that might be associated with
- * this nfs node.
+ * Free up any directory cookie structures and large file handle
+ * structures that might be associated with this nfs node.
*/
- nfs_lock(np, NFS_NODE_LOCK_FORCE);
- if (vnode_vtype(vp) == VDIR) {
- dp = np->n_cookies.lh_first;
- while (dp) {
- dp2 = dp;
- dp = dp->ndm_list.le_next;
- FREE_ZONE((caddr_t)dp2,
- sizeof (struct nfsdmap), M_NFSDIROFF);
- }
- }
- if (np->n_fhsize > NFS_SMALLFH) {
+ nfs_node_lock_force(np);
+ if ((vnode_vtype(vp) == VDIR) && np->n_cookiecache)
+ FREE_ZONE(np->n_cookiecache, sizeof(struct nfsdmap), M_NFSDIROFF);
+ if (np->n_fhsize > NFS_SMALLFH)
FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
- }
-
- nfs_unlock(np);
+ nfs_node_unlock(np);
vnode_clearfsnode(vp);
if (np->n_parent) {
np->n_parent = NULL;
}
- lck_rw_destroy(&np->n_lock, nfs_node_lck_grp);
- lck_rw_destroy(&np->n_datalock, nfs_node_lck_grp);
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
FSDBG_BOT(265, vp, np, np->n_flag, 0xd1ed1e);
FREE_ZONE(np, sizeof(struct nfsnode), M_NFSNODE);
/*
* Acquire an NFS node lock
*/
+
int
-nfs_lock(nfsnode_t np, int locktype)
+nfs_node_lock_internal(nfsnode_t np, int force)
{
- FSDBG_TOP(268, np, locktype, np->n_lockowner, 0);
- if (locktype == NFS_NODE_LOCK_SHARED) {
- lck_rw_lock_shared(&np->n_lock);
- } else {
- lck_rw_lock_exclusive(&np->n_lock);
- np->n_lockowner = current_thread();
- }
- if ((locktype != NFS_NODE_LOCK_FORCE) && !(np->n_hflag && NHHASHED)) {
- FSDBG_BOT(268, np, 0xdead, np->n_lockowner, 0);
- nfs_unlock(np);
+ FSDBG_TOP(268, np, force, 0, 0);
+ lck_mtx_lock(&np->n_lock);
+ if (!force && !(np->n_hflag && NHHASHED)) {
+ FSDBG_BOT(268, np, 0xdead, 0, 0);
+ lck_mtx_unlock(&np->n_lock);
return (ENOENT);
}
- FSDBG_BOT(268, np, locktype, np->n_lockowner, 0);
+ FSDBG_BOT(268, np, force, 0, 0);
return (0);
}
+int
+nfs_node_lock(nfsnode_t np)
+{
+ return nfs_node_lock_internal(np, 0);
+}
+
+void
+nfs_node_lock_force(nfsnode_t np)
+{
+ nfs_node_lock_internal(np, 1);
+}
+
/*
* Release an NFS node lock
*/
void
-nfs_unlock(nfsnode_t np)
+nfs_node_unlock(nfsnode_t np)
{
- FSDBG(269, np, np->n_lockowner, current_thread(), 0);
- np->n_lockowner = NULL;
- lck_rw_done(&np->n_lock);
+ FSDBG(269, np, current_thread(), 0, 0);
+ lck_mtx_unlock(&np->n_lock);
}
/*
* Acquire 2 NFS node locks
- * - locks taken in order given (assumed to be parent-child order)
+ * - locks taken in reverse address order
* - both or neither of the locks are taken
* - only one lock taken per node (dup nodes are skipped)
*/
int
-nfs_lock2(nfsnode_t np1, nfsnode_t np2, int locktype)
+nfs_node_lock2(nfsnode_t np1, nfsnode_t np2)
{
+ nfsnode_t first, second;
int error;
- if ((error = nfs_lock(np1, locktype)))
+ first = (np1 > np2) ? np1 : np2;
+ second = (np1 > np2) ? np2 : np1;
+ if ((error = nfs_node_lock(first)))
return (error);
if (np1 == np2)
return (error);
- if ((error = nfs_lock(np2, locktype)))
- nfs_unlock(np1);
+ if ((error = nfs_node_lock(second)))
+ nfs_node_unlock(first);
return (error);
}
-/*
- * Unlock a couple of NFS nodes
- */
void
-nfs_unlock2(nfsnode_t np1, nfsnode_t np2)
+nfs_node_unlock2(nfsnode_t np1, nfsnode_t np2)
{
- nfs_unlock(np1);
+ nfs_node_unlock(np1);
if (np1 != np2)
- nfs_unlock(np2);
+ nfs_node_unlock(np2);
}
/*
- * Acquire 4 NFS node locks
- * - fdnp/fnp and tdnp/tnp locks taken in order given
- * - otherwise locks taken in node address order.
- * - all or none of the locks are taken
- * - only one lock taken per node (dup nodes are skipped)
- * - some of the node pointers may be null
+ * Manage NFS node busy state.
+ * (Similar to NFS node locks above)
*/
int
-nfs_lock4(nfsnode_t fdnp, nfsnode_t fnp, nfsnode_t tdnp, nfsnode_t tnp, int locktype)
+nfs_node_set_busy(nfsnode_t np, thread_t thd)
{
- nfsnode_t list[4];
- int i, lcnt = 0, error;
-
- if (fdnp == tdnp) {
- list[lcnt++] = fdnp;
- } else if (fdnp->n_parent && (tdnp == VTONFS(fdnp->n_parent))) {
- list[lcnt++] = tdnp;
- list[lcnt++] = fdnp;
- } else if (tdnp->n_parent && (fdnp == VTONFS(tdnp->n_parent))) {
- list[lcnt++] = fdnp;
- list[lcnt++] = tdnp;
- } else if (fdnp < tdnp) {
- list[lcnt++] = fdnp;
- list[lcnt++] = tdnp;
- } else {
- list[lcnt++] = tdnp;
- list[lcnt++] = fdnp;
+ struct timespec ts = { 2, 0 };
+ int error;
+
+ if ((error = nfs_node_lock(np)))
+ return (error);
+ while (ISSET(np->n_flag, NBUSY)) {
+ SET(np->n_flag, NBUSYWANT);
+ msleep(np, &np->n_lock, PZERO-1, "nfsbusywant", &ts);
+ if ((error = nfs_sigintr(NFSTONMP(np), NULL, thd, 0)))
+ break;
}
+ if (!error)
+ SET(np->n_flag, NBUSY);
+ nfs_node_unlock(np);
+ return (error);
+}
- if (!tnp || (fnp == tnp) || (tnp == fdnp)) {
- list[lcnt++] = fnp;
- } else if (fnp < tnp) {
- list[lcnt++] = fnp;
- list[lcnt++] = tnp;
- } else {
- list[lcnt++] = tnp;
- list[lcnt++] = fnp;
+void
+nfs_node_clear_busy(nfsnode_t np)
+{
+ int wanted;
+
+ nfs_node_lock_force(np);
+ wanted = ISSET(np->n_flag, NBUSYWANT);
+ CLR(np->n_flag, NBUSY|NBUSYWANT);
+ nfs_node_unlock(np);
+ if (wanted)
+ wakeup(np);
+}
+
+int
+nfs_node_set_busy2(nfsnode_t np1, nfsnode_t np2, thread_t thd)
+{
+ nfsnode_t first, second;
+ int error;
+
+ first = (np1 > np2) ? np1 : np2;
+ second = (np1 > np2) ? np2 : np1;
+ if ((error = nfs_node_set_busy(first, thd)))
+ return (error);
+ if (np1 == np2)
+ return (error);
+ if ((error = nfs_node_set_busy(second, thd)))
+ nfs_node_clear_busy(first);
+ return (error);
+}
+
+void
+nfs_node_clear_busy2(nfsnode_t np1, nfsnode_t np2)
+{
+ nfs_node_clear_busy(np1);
+ if (np1 != np2)
+ nfs_node_clear_busy(np2);
+}
+
+/* helper function to sort four nodes in reverse address order (no dupes) */
+static void
+nfs_node_sort4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4, nfsnode_t *list, int *lcntp)
+{
+ nfsnode_t na[2], nb[2];
+ int a, b, i, lcnt;
+
+ /* sort pairs then merge */
+ na[0] = (np1 > np2) ? np1 : np2;
+ na[1] = (np1 > np2) ? np2 : np1;
+ nb[0] = (np3 > np4) ? np3 : np4;
+ nb[1] = (np3 > np4) ? np4 : np3;
+ for (a = b = i = lcnt = 0; i < 4; i++) {
+ if (a >= 2)
+ list[lcnt] = nb[b++];
+ else if ((b >= 2) || (na[a] >= nb[b]))
+ list[lcnt] = na[a++];
+ else
+ list[lcnt] = nb[b++];
+ if ((lcnt <= 0) || (list[lcnt] != list[lcnt-1]))
+ lcnt++; /* omit dups */
}
+ if (list[lcnt-1] == NULL)
+ lcnt--;
+ *lcntp = lcnt;
+}
+
+int
+nfs_node_set_busy4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4, thread_t thd)
+{
+ nfsnode_t list[4];
+ int i, lcnt, error;
+
+ nfs_node_sort4(np1, np2, np3, np4, list, &lcnt);
/* Now we can lock using list[0 - lcnt-1] */
- for (i = 0; i < lcnt; ++i) {
- if (list[i])
- if ((error = nfs_lock(list[i], locktype))) {
- /* Drop any locks we acquired. */
- while (--i >= 0) {
- if (list[i])
- nfs_unlock(list[i]);
- }
- return (error);
- }
- }
+ for (i = 0; i < lcnt; ++i)
+ if ((error = nfs_node_set_busy(list[i], thd))) {
+ /* Drop any locks we acquired. */
+ while (--i >= 0)
+ nfs_node_clear_busy(list[i]);
+ return (error);
+ }
return (0);
}
-/*
- * Unlock a group of NFS nodes
- */
void
-nfs_unlock4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4)
+nfs_node_clear_busy4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4)
{
nfsnode_t list[4];
- int i, k = 0;
-
- if (np1) {
- nfs_unlock(np1);
- list[k++] = np1;
- }
- if (np2) {
- for (i = 0; i < k; ++i)
- if (list[i] == np2)
- goto skip2;
- nfs_unlock(np2);
- list[k++] = np2;
- }
-skip2:
- if (np3) {
- for (i = 0; i < k; ++i)
- if (list[i] == np3)
- goto skip3;
- nfs_unlock(np3);
- list[k++] = np3;
- }
-skip3:
- if (np4) {
- for (i = 0; i < k; ++i)
- if (list[i] == np4)
- return;
- nfs_unlock(np4);
- }
+ int lcnt;
+
+ nfs_node_sort4(np1, np2, np3, np4, list, &lcnt);
+ while (--lcnt >= 0)
+ nfs_node_clear_busy(list[lcnt]);
}
/*
void
nfs_data_lock(nfsnode_t np, int locktype)
{
- nfs_data_lock2(np, locktype, 1);
+ nfs_data_lock_internal(np, locktype, 1);
+}
+void
+nfs_data_lock_noupdate(nfsnode_t np, int locktype)
+{
+ nfs_data_lock_internal(np, locktype, 0);
}
void
-nfs_data_lock2(nfsnode_t np, int locktype, int updatesize)
+nfs_data_lock_internal(nfsnode_t np, int locktype, int updatesize)
{
FSDBG_TOP(270, np, locktype, np->n_datalockowner, 0);
- if (locktype == NFS_NODE_LOCK_SHARED) {
+ if (locktype == NFS_DATA_LOCK_SHARED) {
if (updatesize && ISSET(np->n_flag, NUPDATESIZE))
nfs_data_update_size(np, 0);
lck_rw_lock_shared(&np->n_datalock);
void
nfs_data_unlock(nfsnode_t np)
{
- nfs_data_unlock2(np, 1);
+ nfs_data_unlock_internal(np, 1);
+}
+void
+nfs_data_unlock_noupdate(nfsnode_t np)
+{
+ nfs_data_unlock_internal(np, 0);
}
void
-nfs_data_unlock2(nfsnode_t np, int updatesize)
+nfs_data_unlock_internal(nfsnode_t np, int updatesize)
{
int mine = (np->n_datalockowner == current_thread());
FSDBG_TOP(271, np, np->n_datalockowner, current_thread(), 0);
FSDBG_TOP(272, np, np->n_flag, np->n_size, np->n_newsize);
if (!datalocked) {
- nfs_data_lock(np, NFS_NODE_LOCK_EXCLUSIVE);
+ nfs_data_lock(np, NFS_DATA_LOCK_EXCLUSIVE);
/* grabbing data lock will automatically update size */
nfs_data_unlock(np);
FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
return;
}
- error = nfs_lock(np, NFS_NODE_LOCK_EXCLUSIVE);
+ error = nfs_node_lock(np);
if (error || !ISSET(np->n_flag, NUPDATESIZE)) {
if (!error)
- nfs_unlock(np);
+ nfs_node_unlock(np);
FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
return;
}
np->n_size = np->n_newsize;
/* make sure we invalidate buffers the next chance we get */
SET(np->n_flag, NNEEDINVALIDATE);
- nfs_unlock(np);
+ nfs_node_unlock(np);
ubc_setsize(NFSTOV(np), (off_t)np->n_size); /* XXX error? */
FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
}
projects / apple / xnu.git / blobdiff