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authorJeff Layton <jlayton@redhat.com>2009-09-21 06:47:50 -0400
committerSteve French <sfrench@us.ibm.com>2009-09-24 18:33:18 +0000
commit3bc303c254335dbd7c7012cc1760b12f1d5514d3 (patch)
tree7da17fbfd697216d9ed0ccd64ea9c03aaf3d52c1 /fs/cifs/Kconfig
parent48541bd3dd4739b4d574b44ea47660c88d833677 (diff)
downloadlwn-3bc303c254335dbd7c7012cc1760b12f1d5514d3.tar.gz
lwn-3bc303c254335dbd7c7012cc1760b12f1d5514d3.zip
cifs: convert oplock breaks to use slow_work facility (try #4)
This is the fourth respin of the patch to convert oplock breaks to use the slow_work facility. A customer of ours was testing a backport of one of the earlier patchsets, and hit a "Busy inodes after umount..." problem. An oplock break job had raced with a umount, and the superblock got torn down and its memory reused. When the oplock break job tried to dereference the inode->i_sb, the kernel oopsed. This patchset has the oplock break job hold an inode and vfsmount reference until the oplock break completes. With this, there should be no need to take a tcon reference (the vfsmount implicitly holds one already). Currently, when an oplock break comes in there's a chance that the oplock break job won't occur if the allocation of the oplock_q_entry fails. There are also some rather nasty races in the allocation and handling these structs. Rather than allocating oplock queue entries when an oplock break comes in, add a few extra fields to the cifsFileInfo struct. Get rid of the dedicated cifs_oplock_thread as well and queue the oplock break job to the slow_work thread pool. This approach also has the advantage that the oplock break jobs can potentially run in parallel rather than be serialized like they are today. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/Kconfig')
-rw-r--r--fs/cifs/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 6994a0f54f02..80f352596807 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -2,6 +2,7 @@ config CIFS
tristate "CIFS support (advanced network filesystem, SMBFS successor)"
depends on INET
select NLS
+ select SLOW_WORK
help
This is the client VFS module for the Common Internet File System
(CIFS) protocol which is the successor to the Server Message Block