diff options
| author | Ned Bass <[email protected]> | 2013-01-14 13:59:14 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2013-01-16 16:28:54 -0800 |
| commit | f1a05fa11484d67161606fd1ecf50bf2abc25ced (patch) | |
| tree | 674f566861abf0ab8005ca1d6eebfaeddc0ac54f /config/kernel.m4 | |
| parent | 94a9bb4709111f5fadb434cce1af6ccb6534e241 (diff) | |
Fix false ENOENT on snapshot control dentries
Lookups in the snapshot control directory for an existing snapshot
fail with ENOENT if an earlier lookup failed before the snapshot was
created. This is because the earlier lookup causes a negative dentry
to be cached which is never invalidated.
The bug can be reproduced as follows (the second ls should succeed):
$ ls /tank/.zfs/snapshot/s
ls: cannot access /tank/.zfs/snapshot/s: No such file or directory
$ zfs snap tank@s
$ ls /tank/.zfs/snapshot/s
ls: cannot access /tank/.zfs/snapshot/s: No such file or directory
To remedy this, always invalidate cached dentries in the snapshot
control directory. Since these entries never exist on disk there is
no significant performance penalty for the extra lookups.
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #1192
Diffstat (limited to 'config/kernel.m4')
| -rw-r--r-- | config/kernel.m4 | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/config/kernel.m4 b/config/kernel.m4 index aab3a167b..58a808011 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -62,6 +62,9 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [ ZFS_AC_KERNEL_INSERT_INODE_LOCKED ZFS_AC_KERNEL_D_MAKE_ROOT ZFS_AC_KERNEL_D_OBTAIN_ALIAS + ZFS_AC_KERNEL_D_SET_D_OP + ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA + ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE ZFS_AC_KERNEL_TRUNCATE_SETSIZE ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY |