diff options
| -rw-r--r-- | fs/nfs/dir.c | 49 |
1 files changed, 35 insertions, 14 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 73f96acd5d37..ff6155f5e8d9 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -528,19 +528,39 @@ static inline void nfs_renew_times(struct dentry * dentry) dentry->d_time = jiffies; } +/* + * Return the intent data that applies to this particular path component + * + * Note that the current set of intents only apply to the very last + * component of the path. + * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. + */ +static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) +{ + if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) + return 0; + return nd->flags & mask; +} + +/* + * Inode and filehandle revalidation for lookups. + * + * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, + * or if the intent information indicates that we're about to open this + * particular file and the "nocto" mount flag is not set. + * + */ static inline int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) { struct nfs_server *server = NFS_SERVER(inode); if (nd != NULL) { - int ndflags = nd->flags; /* VFS wants an on-the-wire revalidation */ - if (ndflags & LOOKUP_REVAL) + if (nd->flags & LOOKUP_REVAL) goto out_force; /* This is an open(2) */ - if ((ndflags & LOOKUP_OPEN) && - !(ndflags & LOOKUP_CONTINUE) && + if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && !(server->flags & NFS_MOUNT_NOCTO)) goto out_force; } @@ -560,12 +580,8 @@ static inline int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { - int ndflags = 0; - - if (nd) - ndflags = nd->flags; /* Don't revalidate a negative dentry if we're creating a new file */ - if ((ndflags & LOOKUP_CREATE) && !(ndflags & LOOKUP_CONTINUE)) + if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) return 0; return !nfs_check_verifier(dir, dentry); } @@ -700,12 +716,16 @@ struct dentry_operations nfs_dentry_operations = { .d_iput = nfs_dentry_iput, }; +/* + * Use intent information to check whether or not we're going to do + * an O_EXCL create using this path component. + */ static inline int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) { if (NFS_PROTO(dir)->version == 2) return 0; - if (!nd || (nd->flags & LOOKUP_CONTINUE) || !(nd->flags & LOOKUP_CREATE)) + if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) return 0; return (nd->intent.open.flags & O_EXCL) != 0; } @@ -772,12 +792,13 @@ struct dentry_operations nfs4_dentry_operations = { .d_iput = nfs_dentry_iput, }; +/* + * Use intent information to determine whether we need to substitute + * the NFSv4-style stateful OPEN for the LOOKUP call + */ static int is_atomic_open(struct inode *dir, struct nameidata *nd) { - if (!nd) - return 0; - /* Check that we are indeed trying to open this file */ - if ((nd->flags & LOOKUP_CONTINUE) || !(nd->flags & LOOKUP_OPEN)) + if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) return 0; /* NFS does not (yet) have a stateful open for directories */ if (nd->flags & LOOKUP_DIRECTORY) |