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authorNeilBrown <neilb@suse.de>2014-07-14 01:28:20 (GMT)
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-08-03 21:14:11 (GMT)
commit49317a7fdaa462b09b9bb4942b64c3a3316bd564 (patch)
treecbdfc9d24d867498dbf22fb456d697944fb5a1b5 /fs/nfs
parent1f70ef96b176bdb3b75230ec68850d83736b387b (diff)
downloadlinux-49317a7fdaa462b09b9bb4942b64c3a3316bd564.tar.xz
NFS: nfs4_lookup_revalidate: only evaluate parent if it will be used.
nfs4_lookup_revalidate only uses 'parent' to get 'dir', and only uses 'dir' if 'inode == NULL'. So we don't need to find out what 'parent' or 'dir' is until we know that 'inode' is NULL. By moving 'dget_parent' inside the 'if', we can reduce the number of call sites for 'dput(parent)'. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/dir.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 7dc88bb..0090dae 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1529,9 +1529,7 @@ EXPORT_SYMBOL_GPL(nfs_atomic_open);
static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
{
- struct dentry *parent = NULL;
struct inode *inode;
- struct inode *dir;
int ret = 0;
if (flags & LOOKUP_RCU)
@@ -1545,34 +1543,35 @@ static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
goto no_open;
inode = dentry->d_inode;
- parent = dget_parent(dentry);
- dir = parent->d_inode;
/* We can't create new files in nfs_open_revalidate(), so we
* optimize away revalidation of negative dentries.
*/
if (inode == NULL) {
+ struct dentry *parent;
+ struct inode *dir;
+
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
if (!nfs_neg_need_reval(dir, dentry, flags))
ret = 1;
+ dput(parent);
goto out;
}
/* NFS only supports OPEN on regular files */
if (!S_ISREG(inode->i_mode))
- goto no_open_dput;
+ goto no_open;
/* We cannot do exclusive creation on a positive dentry */
if (flags & LOOKUP_EXCL)
- goto no_open_dput;
+ goto no_open;
/* Let f_op->open() actually open (and revalidate) the file */
ret = 1;
out:
- dput(parent);
return ret;
-no_open_dput:
- dput(parent);
no_open:
return nfs_lookup_revalidate(dentry, flags);
}