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authorDavid Howells <dhowells@redhat.com>2019-07-30 14:38:51 +0100
committerDavid Howells <dhowells@redhat.com>2019-07-30 14:38:51 +0100
commit5dc84855b0fc7e1db182b55c5564fd539d6eff92 (patch)
tree0290def0100fe4508089c98d0c3f9aea2118dfe0 /fs/afs
parent37c0bbb3326674940e657118306ac52364314523 (diff)
afs: Only update d_fsdata if different in afs_d_revalidate()
In the in-kernel afs filesystem, d_fsdata is set with the data version of the parent directory. afs_d_revalidate() will update this to the current directory version, but it shouldn't do this if it the value it read from d_fsdata is the same as no lock is held and cmpxchg() is not used. Fix the code to only change the value if it is different from the current directory version. Fixes: 260a980317da ("[AFS]: Add "directory write" support.") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/dir.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 20aa18b38a49..618e26cea887 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1017,7 +1017,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
dir_version = (long)dir->status.data_version;
de_version = (long)dentry->d_fsdata;
if (de_version == dir_version)
- goto out_valid;
+ goto out_valid_noupdate;
dir_version = (long)dir->invalid_before;
if (de_version - dir_version >= 0)
@@ -1081,6 +1081,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
out_valid:
dentry->d_fsdata = (void *)dir_version;
+out_valid_noupdate:
dput(parent);
key_put(key);
_leave(" = 1 [valid]");