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Jeff Mahoney 87826df0ec btrfs: delalloc for page dirtied out-of-band in fixup worker 
We encountered an issue that was easily observable on s/390 systems but
 could really happen anywhere. The timing just seemed to hit reliably
 on s/390 with limited memory.

 The gist is that when an unexpected set_page_dirty() happened, we'd
 run into the BUG() in btrfs_writepage_fixup_worker since it wasn't
 properly set up for delalloc.

 This patch does the following:
 - Performs the missing delalloc in the fixup worker
 - Allow the start hook to return -EBUSY which informs __extent_writepage
   that it should mark the page skipped and not to redirty it. This is
   required since the fixup worker can fail with -ENOSPC and the page
   will have already been redirtied. That causes an Oops in
   drop_outstanding_extents later. Retrying the fixup worker could
   lead to an infinite loop. Deferring the page redirty also saves us
   some cycles since the page would be stuck in a resubmit-redirty loop
   until the fixup worker completes. It's not harmful, just wasteful.
 - If the fixup worker fails, we mark the page and mapping as errored,
   and end the writeback, similar to what we would do had the page
   actually been submitted to writeback.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
2012-02-15 16:40:25 +01:00
..
acl.c Btrfs: fix return value of btrfs_get_acl() 2011-10-20 18:10:47 +02:00
async-thread.c Btrfs: fix worker lock misuse in find_worker 2011-12-23 07:53:00 -05:00
async-thread.h Btrfs: fix num_workers_starting bug and other bugs in async thread 2011-12-15 11:04:21 -05:00
backref.c Btrfs: avoid positive number with ERR_PTR 2012-02-15 16:40:23 +01:00
backref.h Btrfs: added btrfs_find_all_roots() 2012-01-04 16:26:38 +01:00
btrfs_inode.h Btrfs: add a delalloc mutex to inodes for delalloc reservations 2012-01-16 15:29:43 -05:00
check-integrity.c Btrfs: fix warning for 32-bit build of fs/btrfs/check-integrity.c 2012-01-26 15:01:11 -05:00
check-integrity.h Btrfs: add optional integrity check code 2011-12-21 19:14:09 +01:00
compat.h
compression.c btrfs: separate superblock items out of fs_info 2011-11-06 03:04:01 -05:00
compression.h btrfs: rename variables clashing with global function names 2011-05-02 13:57:19 +02:00
ctree.c Btrfs: mark delayed refs as for cow 2011-12-22 16:22:27 +01:00
ctree.h Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs into integration 2012-01-16 15:27:58 -05:00
delayed-inode.c Btrfs: space leak tracepoints 2012-01-16 15:29:43 -05:00
delayed-inode.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
delayed-ref.c Btrfs: add waitqueue instead of doing busy waiting for more delayed refs 2012-01-04 16:12:48 +01:00
delayed-ref.h Btrfs: add waitqueue instead of doing busy waiting for more delayed refs 2012-01-04 16:12:48 +01:00
dir-item.c Btrfs: remove redundant code for dir item lookup 2011-08-01 14:30:48 -04:00
disk-io.c btrfs: Sector Size check during Mount 2012-02-15 16:40:22 +01:00
disk-io.h Merge branch 'for-chris' of git://github.com/sensille/linux into integration 2011-11-06 03:05:08 -05:00
export.c Merge branch 'ino-alloc' of git://repo.or.cz/linux-btrfs-devel into inode_numbers 2011-05-21 09:27:38 -04:00
export.h
extent-tree.c Btrfs: fix trim 0 bytes after a device delete 2012-02-15 16:40:23 +01:00
extent_io.c btrfs: delalloc for page dirtied out-of-band in fixup worker 2012-02-15 16:40:25 +01:00
extent_io.h btrfs: delalloc for page dirtied out-of-band in fixup worker 2012-02-15 16:40:25 +01:00
extent_map.c Btrfs: clean up code for merging extent maps 2011-08-01 14:30:50 -04:00
extent_map.h btrfs: drop gfp parameter from alloc_extent_map 2011-05-02 13:57:21 +02:00
file-item.c btrfs: separate superblock items out of fs_info 2011-11-06 03:04:01 -05:00
file.c Btrfs: return the internal error unchanged if btrfs_get_extent_fiemap() call failed for SEEK_DATA/SEEK_HOLE inquiry 2012-02-15 16:40:23 +01:00
free-space-cache.c Btrfs: fix memory leak in load_free_space_cache() 2012-02-15 16:40:24 +01:00
free-space-cache.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
hash.h
inode-item.c Btrfs: BUG_ON is deleted from the caller of btrfs_truncate_item & btrfs_extend_item 2011-05-23 13:24:39 -04:00
inode-map.c Btrfs: space leak tracepoints 2012-01-16 15:29:43 -05:00
inode-map.h Btrfs: Support reading/writing on disk free ino cache 2011-04-25 16:46:11 +08:00
inode.c btrfs: delalloc for page dirtied out-of-band in fixup worker 2012-02-15 16:40:25 +01:00
ioctl.c Btrfs: do not defrag a file partially 2012-01-26 15:01:12 -05:00
ioctl.h Btrfs: add balance progress reporting 2012-01-16 22:04:49 +02:00
Kconfig Btrfs: add config option to enable btrfs integrity check 2011-12-21 19:14:16 +01:00
locking.c Btrfs: add nested locking mode for paths 2012-01-04 16:12:29 +01:00
locking.h Btrfs: switch the btrfs tree locks to reader/writer 2011-07-27 12:46:46 -04:00
lzo.c Btrfs: Avoid accessing unmapped kernel address 2011-02-16 15:37:58 -05:00
Makefile Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs into integration 2012-01-16 15:27:58 -05:00
ordered-data.c Btrfs: add initial tracepoint support for btrfs 2011-03-28 05:37:33 -04:00
ordered-data.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
orphan.c Btrfs: fixup return code for btrfs_del_orphan_item 2010-12-09 13:57:15 -05:00
print-tree.c btrfs: fix oops on failure path 2011-10-20 18:10:50 +02:00
print-tree.h
reada.c Btrfs: rename btrfs_bio multi -> bbio for consistency 2011-11-06 03:11:21 -05:00
relocation.c Btrfs: add a delalloc mutex to inodes for delalloc reservations 2012-01-16 15:29:43 -05:00
root-tree.c btrfs: make btrfs_set_root_node void 2011-08-01 14:30:44 -04:00
scrub.c btrfs: don't check DUP chunks twice 2012-02-15 16:40:24 +01:00
struct-funcs.c Btrfs: stop using highmem for extent_buffers 2011-07-27 12:46:45 -04:00
super.c Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs into integration 2012-01-16 15:27:58 -05:00
sysfs.c btrfs: Remove unused sysfs code 2011-06-17 14:54:18 -04:00
transaction.c Btrfs: space leak tracepoints 2012-01-16 15:29:43 -05:00
transaction.h Merge branch 'for-chris' of 2011-05-28 07:00:39 -04:00
tree-defrag.c btrfs: drop unused parameter from btrfs_release_path 2011-05-02 13:57:22 +02:00
tree-log.c btrfs: Fix busyloops in transaction waiting code 2012-01-26 15:01:11 -05:00
tree-log.h btrfs: remove unused function prototypes 2011-05-04 14:01:26 +02:00
ulist.c Btrfs: generic data structure to build unique lists 2011-12-22 16:22:24 +01:00
ulist.h Btrfs: generic data structure to build unique lists 2011-12-22 16:22:24 +01:00
version.h
volumes.c Btrfs: use larger system chunks 2012-01-16 15:38:24 -05:00
volumes.h Merge branch 'for-chris' of git://repo.or.cz/linux-btrfs-devel into integration 2012-01-16 15:26:17 -05:00
xattr.c Btrfs: do not use btrfs_end_transaction_throttle everywhere 2012-01-16 15:28:54 -05:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00
zlib.c zlib: slim down zlib_deflate() workspace when possible 2011-03-22 17:44:17 -07:00