Commit 154210cc authored by Anand Avati's avatar Anand Avati Committed by Miklos Szeredi

fuse: ignore entry-timeout on LOOKUP_REVAL

The following test case demonstrates the bug:

  sh# mount -t glusterfs localhost:meta-test /mnt/one

  sh# mount -t glusterfs localhost:meta-test /mnt/two

  sh# echo stuff > /mnt/one/file; rm -f /mnt/two/file; echo stuff > /mnt/one/file
  bash: /mnt/one/file: Stale file handle

  sh# echo stuff > /mnt/one/file; rm -f /mnt/two/file; sleep 1; echo stuff > /mnt/one/file

On the second open() on /mnt/one, FUSE would have used the old
nodeid (file handle) trying to re-open it. Gluster is returning
-ESTALE. The ESTALE propagates back to namei.c:filename_lookup()
where lookup is re-attempted with LOOKUP_REVAL. The right
behavior now, would be for FUSE to ignore the entry-timeout and
and do the up-call revalidation. Instead FUSE is ignoring
LOOKUP_REVAL, succeeding the revalidation (because entry-timeout
has not passed), and open() is again retried on the old file
handle and finally the ESTALE is going back to the application.

Fix: if revalidation is happening with LOOKUP_REVAL, then ignore
entry-timeout and always do the up-call.
Signed-off-by: default avatarAnand Avati <avati@redhat.com>
Reviewed-by: default avatarNiels de Vos <ndevos@redhat.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
Cc: stable@vger.kernel.org
parent 126b9d43
...@@ -198,7 +198,8 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) ...@@ -198,7 +198,8 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
inode = ACCESS_ONCE(entry->d_inode); inode = ACCESS_ONCE(entry->d_inode);
if (inode && is_bad_inode(inode)) if (inode && is_bad_inode(inode))
goto invalid; goto invalid;
else if (time_before64(fuse_dentry_time(entry), get_jiffies_64())) { else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
(flags & LOOKUP_REVAL)) {
int err; int err;
struct fuse_entry_out outarg; struct fuse_entry_out outarg;
struct fuse_req *req; struct fuse_req *req;
......
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