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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-05-10 10:34:21 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-05-28 13:29:19 -0400 |
| commit | 9f6d44d418b1f47298a92cd2dc42b8dba8b04816 (patch) | |
| tree | da47696347f15bc29d954803c59b6784a8d06163 /fs/nfs/dir.c | |
| parent | 73dd684a4dcee8c55882a01aeb8b5cbf203de955 (diff) | |
| download | linux-stable-9f6d44d418b1f47298a92cd2dc42b8dba8b04816.tar.gz linux-stable-9f6d44d418b1f47298a92cd2dc42b8dba8b04816.tar.bz2 linux-stable-9f6d44d418b1f47298a92cd2dc42b8dba8b04816.zip | |
NFS: Optimise away lookups for rename targets
We can optimise away any lookup for a rename target, unless we're
being asked to revalidate a dentry that might be in use.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/dir.c')
| -rw-r--r-- | fs/nfs/dir.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 9dde88334c9c..b315f53b3aec 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1051,13 +1051,15 @@ out_force: * * If LOOKUP_RCU prevents us from performing a full check, return 1 * suggesting a reval is needed. + * + * Note that when creating a new file, or looking up a rename target, + * then it shouldn't be necessary to revalidate a negative dentry. */ static inline int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, unsigned int flags) { - /* Don't revalidate a negative dentry if we're creating a new file */ - if (flags & LOOKUP_CREATE) + if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) return 0; if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) return 1; @@ -1347,7 +1349,7 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in * If we're doing an exclusive create, optimize away the lookup * but don't hash the dentry. */ - if (nfs_is_exclusive_create(dir, flags)) + if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) return NULL; res = ERR_PTR(-ENOMEM); |