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NFS: Optimise away the close-to-open GETATTR when we have NFSv4 OPEN 

NFSv4 should not need to perform an extra close-to-open GETATTR as part
of the process of looking up a regular file, since the OPEN call will
do that for us.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2018-05-10 10:08:36 -04:00
parent 786b71f5b7
commit 479219218f
1 changed files with 16 additions and 4 deletions
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20
fs/nfs/dir.c
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@ -1012,13 +1012,25 @@ int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
if (IS_AUTOMOUNT(inode))
return 0;
if (flags & LOOKUP_OPEN) {
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
/* A NFSv4 OPEN will revalidate later */
if (server->caps & NFS_CAP_ATOMIC_OPEN)
goto out;
/* Fallthrough */
case S_IFDIR:
if (server->flags & NFS_MOUNT_NOCTO)
break;
/* NFS close-to-open cache consistency validation */
goto out_force;
}
}
/* VFS wants an on-the-wire revalidation */
if (flags & LOOKUP_REVAL)
goto out_force;
/* This is an open(2) */
if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) &&
(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
goto out_force;
out:
return (inode->i_nlink == 0) ? -ENOENT : 0;
out_force: