/*
- * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
+#include <sys/vnode_internal.h>
#include <sys/vnode.h>
#include <sys/ubc.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
+#include <sys/time.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
static lck_grp_t *nfs_data_lck_grp;
lck_mtx_t *nfs_node_hash_mutex;
+#define NFS_NODE_DBG(...) NFS_DBG(NFS_FAC_NODE, 7, ## __VA_ARGS__)
+
/*
* Initialize hash links for nfsnodes
* and build nfsnode free list.
return (fhsum);
}
+
+int nfs_case_insensitive(mount_t);
+
+int
+nfs_case_insensitive(mount_t mp)
+{
+ struct nfsmount *nmp = VFSTONFS(mp);
+ int answer = 0;
+ int skip = 0;
+
+ if (nmp == NULL) {
+ return (0);
+ }
+
+ if (nmp->nm_vers == NFS_VER2) {
+ /* V2 has no way to know */
+ return (0);
+ }
+
+ lck_mtx_lock(&nmp->nm_lock);
+ if (nmp->nm_vers == NFS_VER3) {
+ if (!(nmp->nm_state & NFSSTA_GOTPATHCONF)) {
+ /* We're holding the node lock so we just return
+ * with answer as case sensitive. Is very rare
+ * for file systems not to be homogenous w.r.t. pathconf
+ */
+ skip = 1;
+ }
+ } else if (!(nmp->nm_fsattr.nfsa_flags & NFS_FSFLAG_HOMOGENEOUS)) {
+ /* no pathconf info cached */
+ skip = 1;
+ }
+
+ if (!skip && NFS_BITMAP_ISSET(nmp->nm_fsattr.nfsa_bitmap, NFS_FATTR_CASE_INSENSITIVE))
+ answer = 1;
+
+ lck_mtx_unlock(&nmp->nm_lock);
+
+ return (answer);
+}
+
+
/*
* Look up a vnode/nfsnode by file handle.
* Callers must check for mount points!!
} else {
if (dnp && cnp && (flags & NG_MAKEENTRY))
cache_enter(NFSTOV(dnp), vp, cnp);
+ /*
+ * Update the vnode if the name/and or the parent has
+ * changed. We need to do this so that if getattrlist is
+ * called asking for ATTR_CMN_NAME, that the "most"
+ * correct name is being returned. In addition for
+ * monitored vnodes we need to kick the vnode out of the
+ * name cache. We do this so that if there are hard
+ * links in the same directory the link will not be
+ * found and a lookup will get us here to return the
+ * name of the current link. In addition by removing the
+ * name from the name cache the old name will not be
+ * found after a rename done on another client or the
+ * server. The principle reason to do this is because
+ * Finder is asking for notifications on a directory.
+ * The directory changes, Finder gets notified, reads
+ * the directory (which we have purged) and for each
+ * entry returned calls getattrlist with the name
+ * returned from readdir. gettattrlist has to call
+ * namei/lookup to resolve the name, because its not in
+ * the cache we end up here. We need to update the name
+ * so Finder will get the name it called us with.
+ *
+ * We had an imperfect solution with respect to case
+ * sensitivity. There is a test that is run in
+ * FileBuster that does renames from some name to
+ * another name differing only in case. It then reads
+ * the directory looking for the new name, after it
+ * finds that new name, it ask gettattrlist to verify
+ * that the name is the new name. Usually that works,
+ * but renames generate fsevents and fseventsd will do a
+ * lookup on the name via lstat. Since that test renames
+ * old name to new name back and forth there is a race
+ * that an fsevent will be behind and will access the
+ * file by the old name, on a case insensitive file
+ * system that will work. Problem is if we do a case
+ * sensitive compare, we're going to change the name,
+ * which the test's getattrlist verification step is
+ * going to fail. So we will check the case sensitivity
+ * of the file system and do the appropriate compare. In
+ * a rare instance for non homogeneous file systems
+ * w.r.t. pathconf we will use case sensitive compares.
+ * That could break if the file system is actually case
+ * insensitive.
+ *
+ * Note that V2 does not know the case, so we just
+ * assume case sensitivity.
+ *
+ * This is clearly not perfect due to races, but this is
+ * as good as its going to get. You can defeat the
+ * handling of hard links simply by doing:
+ *
+ * while :; do ls -l > /dev/null; done
+ *
+ * in a terminal window. Even a single ls -l can cause a
+ * race.
+ *
+ * <rant>What we really need is for the caller, that
+ * knows the name being used is valid since it got it
+ * from a readdir to use that name and not ask for the
+ * ATTR_CMN_NAME</rant>
+ */
+ if (dnp && cnp && (vp != NFSTOV(dnp))) {
+ int update_flags = (vnode_ismonitored((NFSTOV(dnp)))) ? VNODE_UPDATE_CACHE : 0;
+ int (*cmp)(const char *s1, const char *s2, size_t n);
+
+ cmp = nfs_case_insensitive(mp) ? strncasecmp : strncmp;
+
+ if (vp->v_name && cnp->cn_namelen && (*cmp)(cnp->cn_nameptr, vp->v_name, cnp->cn_namelen))
+ update_flags |= VNODE_UPDATE_NAME;
+ if ((vp->v_name == NULL && cnp->cn_namelen != 0) || (vp->v_name != NULL && cnp->cn_namelen == 0))
+ update_flags |= VNODE_UPDATE_NAME;
+ if (vnode_parent(vp) != NFSTOV(dnp))
+ update_flags |= VNODE_UPDATE_PARENT;
+ if (update_flags) {
+ NFS_NODE_DBG("vnode_update_identity old name %s new name %*s\n",
+ vp->v_name, cnp->cn_namelen, cnp->cn_nameptr ? cnp->cn_nameptr : "");
+ vnode_update_identity(vp, NFSTOV(dnp), cnp->cn_nameptr, cnp->cn_namelen, 0, update_flags);
+ }
+ }
+
*npp = np;
}
FSDBG_BOT(263, dnp, *npp, 0xcace0000, error);
{
vnode_t vp = ap->a_vp;
vfs_context_t ctx = ap->a_context;
- nfsnode_t np = VTONFS(ap->a_vp);
+ nfsnode_t np;
struct nfs_sillyrename *nsp;
struct nfs_vattr nvattr;
int unhash, attrerr, busyerror, error, inuse, busied, force;
struct nfs_open_file *nofp;
struct componentname cn;
- struct nfsmount *nmp = NFSTONMP(np);
- mount_t mp = vnode_mount(vp);
+ struct nfsmount *nmp;
+ mount_t mp;
+
+ if (vp == NULL)
+ panic("nfs_vnop_inactive: vp == NULL");
+ np = VTONFS(vp);
+ if (np == NULL)
+ panic("nfs_vnop_inactive: np == NULL");
+
+ nmp = NFSTONMP(np);
+ mp = vnode_mount(vp);
restart:
force = (!mp || (mp->mnt_kern_flag & MNTK_FRCUNMOUNT));
/* There shouldn't be any open or lock state at this point */
lck_mtx_lock(&np->n_openlock);
- if (np->n_openrefcnt && !force)
+ if (np->n_openrefcnt && !force) {
+ /*
+ * vnode_rele and vnode_put drop the vnode lock before
+ * calling VNOP_INACTIVE, so there is a race were the
+ * vnode could become active again. Perhaps there are
+ * other places where this can happen, so if we've got
+ * here we need to get out.
+ */
+#ifdef NFS_NODE_DEBUG
NP(np, "nfs_vnop_inactive: still open: %d", np->n_openrefcnt);
+#endif
+ lck_mtx_unlock(&np->n_openlock);
+ return 0;
+ }
+
TAILQ_FOREACH(nofp, &np->n_opens, nof_link) {
lck_mtx_lock(&nofp->nof_lock);
if (nofp->nof_flags & NFS_OPEN_FILE_BUSY) {
FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
}
+#define DODEBUG 1
+
+int
+nfs_mount_is_dirty(mount_t mp)
+{
+ u_long i;
+ nfsnode_t np;
+#ifdef DODEBUG
+ struct timeval now, then, diff;
+ u_long ncnt = 0;
+ microuptime(&now);
+#endif
+ lck_mtx_lock(nfs_node_hash_mutex);
+ for (i = 0; i <= nfsnodehash; i++) {
+ LIST_FOREACH(np, &nfsnodehashtbl[i], n_hash) {
+#ifdef DODEBUG
+ ncnt++;
+#endif
+ if (np->n_mount == mp && !LIST_EMPTY(&np->n_dirtyblkhd))
+ goto out;
+ }
+ }
+out:
+ lck_mtx_unlock(nfs_node_hash_mutex);
+#ifdef DODEBUG
+ microuptime(&then);
+ timersub(&then, &now, &diff);
+
+ NFS_DBG(NFS_FAC_SOCK, 7, "mount_is_dirty for %s took %lld mics for %ld slots and %ld nodes return %d\n",
+ vfs_statfs(mp)->f_mntfromname, (uint64_t)diff.tv_sec * 1000000LL + diff.tv_usec, i, ncnt, (i <= nfsnodehash));
+#endif
+
+ return (i <= nfsnodehash);
+}
projects / apple / xnu.git / blobdiff