kernel_optimize_test/fs/ocfs2
wengang wang 6ca497a83e ocfs2: fix rare stale inode errors when exporting via nfs
For nfs exporting, ocfs2_get_dentry() returns the dentry for fh.
ocfs2_get_dentry() may read from disk when the inode is not in memory,
without any cross cluster lock. this leads to the file system loading a
stale inode.

This patch fixes above problem.

Solution is that in case of inode is not in memory, we get the cluster
lock(PR) of alloc inode where the inode in question is allocated from (this
causes node on which deletion is done sync the alloc inode) before reading
out the inode itsself. then we check the bitmap in the group (the inode in
question allcated from) to see if the bit is clear. if it's clear then it's
stale. if the bit is set, we then check generation as the existing code
does.

We have to read out the inode in question from disk first to know its alloc
slot and allot bit. And if its not stale we read it out using ocfs2_iget().
The second read should then be from cache.

And also we have to add a per superblock nfs_sync_lock to cover the lock for
alloc inode and that for inode in question. this is because ocfs2_get_dentry()
and ocfs2_delete_inode() lock on them in reverse order. nfs_sync_lock is locked
in EX mode in ocfs2_get_dentry() and in PR mode in ocfs2_delete_inode(). so
that mutliple ocfs2_delete_inode() can run concurrently in normal case.

[mfasheh@suse.com: build warning fixes and comment cleanups]
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Acked-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2009-04-03 11:39:25 -07:00
..
cluster ocfs2/hb: Expose the list of heartbeating nodes via debugfs 2009-04-03 11:39:14 -07:00
dlm ocfs2/dlm: Tweak mle_state output 2009-04-03 11:39:25 -07:00
acl.c New helper - current_umask() 2009-03-31 23:00:26 -04:00
acl.h ocfs2: add ocfs2_init_acl in mknod 2009-01-05 08:34:20 -08:00
alloc.c ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00
alloc.h ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00
aops.c ocfs2: tweak to get the maximum inline data size with xattr 2009-03-12 16:45:46 -07:00
aops.h
blockcheck.c ocfs2: One more hamming code optimization. 2009-01-05 08:40:35 -08:00
blockcheck.h ocfs2: Add the underlying blockcheck code. 2009-01-05 08:40:31 -08:00
buffer_head_io.c ocfs2: Use BH_JBDPrivateStart instead of BH_Unshadow 2009-01-05 08:40:24 -08:00
buffer_head_io.h ocfs2: Validate metadata only when it's read from disk. 2009-01-05 08:36:53 -08:00
dcache.c constify dentry_operations: OCFS2 2009-03-27 14:44:02 -04:00
dcache.h constify dentry_operations: OCFS2 2009-03-27 14:44:02 -04:00
dir.c ocfs2: fix leaf start calculation in ocfs2_dx_dir_rebalance() 2009-04-03 11:39:17 -07:00
dir.h ocfs2: Introduce dir free space list 2009-04-03 11:39:16 -07:00
dlmglue.c ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
dlmglue.h ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
export.c ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
export.h
extent_map.c ocfs2: Wrap virtual block reads in ocfs2_read_virt_blocks() 2009-01-05 08:36:54 -08:00
extent_map.h ocfs2: Wrap virtual block reads in ocfs2_read_virt_blocks() 2009-01-05 08:36:54 -08:00
file.c remove lots of double-semicolons 2009-01-08 08:31:14 -08:00
file.h ocfs2: Implementation of local and global quota file handling 2009-01-05 08:40:23 -08:00
heartbeat.c
heartbeat.h
inode.c ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
inode.h ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
ioctl.c ocfs2: Don't check for NULL before brelse() 2008-10-13 17:02:44 -07:00
ioctl.h ocfs2: Convert ocfs2 over to unlocked_ioctl 2008-04-18 08:56:11 -07:00
journal.c ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00
journal.h ocfs2: Introduce dir free space list 2009-04-03 11:39:16 -07:00
Kconfig fs/Kconfig: move ocfs2 out 2009-01-22 13:15:54 +03:00
localalloc.c ocfs2: Remove debugfs file local_alloc_stats 2009-04-03 11:39:15 -07:00
localalloc.h ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
locks.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
locks.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
Makefile ocfs2: Add the underlying blockcheck code. 2009-01-05 08:40:31 -08:00
mmap.c mm: page_mkwrite change prototype to match fault 2009-04-01 08:59:14 -07:00
mmap.h
namei.c ocfs2: Optimize inode allocation by remembering last group 2009-04-03 11:39:17 -07:00
namei.h
ocfs1_fs_compat.h
ocfs2_fs.h ocfs2: Enable indexed directories 2009-04-03 11:39:16 -07:00
ocfs2_lockid.h ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
ocfs2_lockingver.h
ocfs2.h ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
quota_global.c ocfs2: Fix possible deadlock in ocfs2_write_dquot() 2009-02-02 14:20:17 -08:00
quota_local.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
quota.h ocfs2: Fix ocfs2_read_quota_block() error handling. 2009-01-05 08:40:24 -08:00
resize.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
resize.h
slot_map.c ocfs2: Validate metadata only when it's read from disk. 2009-01-05 08:36:53 -08:00
slot_map.h
stack_o2cb.c ocfs2: Remove ->hangup() from stack glue operations. 2008-06-16 10:46:52 -07:00
stack_user.c ocfs2: initialize stack_user lvbptr 2008-12-01 14:46:39 -08:00
stackglue.c ocfs2: Remove pointless !! 2008-10-13 17:02:44 -07:00
stackglue.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
suballoc.c ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
suballoc.h ocfs2: fix rare stale inode errors when exporting via nfs 2009-04-03 11:39:25 -07:00
super.c ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00
super.h
symlink.c ocfs2: Wrap inode block reads in a dedicated function. 2009-01-05 08:36:52 -08:00
symlink.h
sysfile.c
sysfile.h
uptodate.c ocfs2: use smaller counters in ocfs2_remove_xattr_clusters_from_cache 2008-10-13 17:02:44 -07:00
uptodate.h ocfs2: Add helper function in uptodate.c for removing xattr clusters 2008-10-13 13:57:59 -07:00
ver.c
ver.h
xattr.c ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00
xattr.h ocfs2: Add a name indexed b-tree to directory inodes 2009-04-03 11:39:15 -07:00