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94c3dcbb0b0cdfd82cedd21705424d8044edc42c
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Wu Fengguang 94c3dcbb0b writeback: update dirtied_when for synced inode to prevent livelock 
Explicitly update .dirtied_when on synced inodes, so that they are no
longer considered for writeback in the next round.

It can prevent both of the following livelock schemes:

- while true; do echo data >> f; done
- while true; do touch f;        done (in theory)

The exact livelock condition is, during sync(1):

(1) no new inodes are dirtied
(2) an inode being actively dirtied

On (2), the inode will be tagged and synced with .nr_to_write=LONG_MAX.
When finished, it will be redirty_tail()ed because it's still dirty
and (.nr_to_write > 0). redirty_tail() won't update its ->dirtied_when
on condition (1). The sync work will then revisit it on the next
queue_io() and find it eligible again because its old ->dirtied_when
predates the sync work start time.

We'll do more aggressive "keep writeback as long as we wrote something"
logic in wb_writeback(). The "use LONG_MAX .nr_to_write" trick in commit
b9543dac5b ("writeback: avoid livelocking WB_SYNC_ALL writeback") will
no longer be enough to stop sync livelock.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-06-08 08:25:20 +08:00
..
9p
9p: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
adfs
Fix common misspellings
2011-03-31 11:26:23 -03:00
affs
affs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
afs
afs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
autofs4
autofs4: bogus dentry_unhash() added in ->unlink()
2011-05-30 01:50:53 -04:00
befs
Fix common misspellings
2011-03-31 11:26:23 -03:00
bfs
bfs: remove unnecessary dentry_unhash on dir rename
2011-05-28 01:02:50 -04:00
btrfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
2011-06-05 06:17:23 +09:00
cachefiles
Fix common misspellings
2011-03-31 11:26:23 -03:00
ceph
ceph: remove unnecessary dentry_unhash calls
2011-05-26 07:26:53 -04:00
cifs
cifs/ubifs: Fix shrinker API change fallout
2011-05-29 11:17:34 -07:00
coda
coda: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
configfs
configfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
cramfs
cramfs: generate unique inode number for better inode cache usage
2011-01-13 08:03:23 -08:00
debugfs
debugfs: move to new strtobool
2011-05-19 16:55:28 +09:30
devpts
fs/devpts/inode.c: correctly check d_alloc_name() return code in devpts_pty_new()
2011-03-22 17:44:17 -07:00
dlm
Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-05-26 13:19:00 -07:00
ecryptfs
eCryptfs: Remove ecryptfs_header_cache_2
2011-05-29 14:24:25 -05:00
efs
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
exofs
exofs: remove unnecessary dentry_unhash on rmdir/rename_dir
2011-05-26 07:26:57 -04:00
exportfs
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
ext2
ext2: remove unnecessary dentry_unhash on rmdir/rename_dir
2011-05-26 07:26:56 -04:00
ext3
fs: pass exact type of data dirties to ->dirty_inode
2011-05-27 07:04:40 -04:00
ext4
writeback: introduce .tagged_writepages for the WB_SYNC_NONE sync stage
2011-06-08 08:25:20 +08:00
fat
fat: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
freevxfs
treewide: fix a few typos in comments
2011-05-10 10:16:21 +02:00
fscache
fscache: remove dead code under CONFIG_WORKQUEUE_DEBUGFS
2011-05-25 08:39:44 -07:00
fuse
fuse: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:53 -04:00
gfs2
Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-05-26 13:19:00 -07:00
hfs
hfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:52 -04:00
hfsplus
hfsplus: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:52 -04:00
hostfs
hostfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:52 -04:00
hpfs
hpfs: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
hppfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
hugetlbfs
mm: don't access vm_flags as 'int'
2011-05-26 09:20:31 -07:00
isofs
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
jbd
jbd: Fix comment to match the code in journal_start()
2011-05-24 00:27:53 +02:00
jbd2
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2011-05-26 09:53:20 -07:00
jffs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-05-28 13:03:41 -07:00
jfs
jfs: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:51 -04:00
lockd
NLM: Fix "kernel BUG at fs/lockd/host.c:417!" or ".../host.c:283!"
2011-01-25 15:24:47 -05:00
logfs
logfs: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:51 -04:00
minix
minix: remove unnecessary dentry_unhash on rmdir, dir rename
2011-05-28 01:02:54 -04:00
ncpfs
ncpfs: fix rename over directory with dangling references
2011-05-28 01:02:53 -04:00
nfs
Merge branch 'pnfs-submit' of git://git.open-osd.org/linux-open-osd
2011-05-29 14:10:13 -07:00
nfs_common
Fix common misspellings
2011-03-31 11:26:23 -03:00
nfsd
Merge branch 'for-2.6.40' of git://linux-nfs.org/~bfields/linux
2011-05-29 11:21:12 -07:00
nilfs2
nilfs2: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:51 -04:00
nls
…
notify
Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6
2011-04-07 11:14:49 -07:00
ntfs
Fix common misspellings
2011-03-31 11:26:23 -03:00
ocfs2
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
2011-05-27 10:23:10 -07:00
omfs
omfs: remove unnecessary dentry_unhash on rmdir, dir rneame
2011-05-28 01:02:52 -04:00
openpromfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
partitions
Revert "block: Remove extra discard_alignment from hd_struct."
2011-05-30 07:42:51 +02:00
proc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
2011-05-29 11:29:28 -07:00
pstore
pstore: fix pstore filesystem mount/remount issue
2011-05-16 11:05:00 -07:00
qnx4
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
quota
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
ramfs
ramfs: fix memleak on no-mmu arch
2011-04-14 16:06:56 -07:00
reiserfs
reiserfs: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:51 -04:00
romfs
fs: icache RCU free inodes
2011-01-07 17:50:26 +11:00
squashfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
2011-05-29 11:19:45 -07:00
sysfs
sysfs: remove "last sysfs file:" line from the oops messages
2011-05-13 16:05:51 -07:00
sysv
sysv: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:50 -04:00
ubifs
UBIFS: fix-up free space earlier
2011-06-03 18:12:31 +03:00
udf
udf: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:52 -04:00
ufs
ufs: remove unnecessary dentry_unhash from rmdir, dir rename
2011-05-28 01:02:51 -04:00
xfs
fs: pass exact type of data dirties to ->dirty_inode
2011-05-27 07:04:40 -04:00
aio.c
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
anon_inodes.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
attr.c
Cache xattr security drop check for write v2
2011-05-28 12:02:09 -04:00
bad_inode.c
fs: provide rcu-walk aware permission i_ops
2011-01-07 17:50:29 +11:00
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
brk: COMPAT_BRK: fix detection of randomized brk
2011-04-14 16:06:55 -07:00
binfmt_em86.c
…
binfmt_flat.c
CRED: Fix load_flat_shared_library() to initialise bprm correctly
2011-05-03 10:10:51 +10:00
binfmt_misc.c
…
binfmt_script.c
…
binfmt_som.c
…
bio-integrity.c
block: Require subsystems to explicitly allocate bio_set integrity mempool
2011-03-17 11:11:05 +01:00
bio.c
block: improve the bio_add_page() and bio_add_pc_page() descriptions
2011-05-28 14:44:46 +02:00
block_dev.c
block: blkdev_get() should access ->bd_disk only after success
2011-06-01 08:28:47 +02:00
buffer.c
fs: block_page_mkwrite should wait for writeback to finish
2011-05-28 01:03:21 -04:00
char_dev.c
Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block
2011-01-13 10:45:01 -08:00
compat_binfmt_elf.c
…
compat_ioctl.c
Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
2011-01-07 14:39:20 -08:00
compat.c
exec: unify do_execve/compat_do_execve code
2011-04-09 15:53:56 +02:00
dcache.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
dcookies.c
…
direct-io.c
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
drop_caches.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
eventfd.c
Docbook: add fs/eventfd.c and fix typos in it
2011-02-21 15:07:04 -08:00
eventpoll.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
exec.c
coredump: add support for exe_file in core name
2011-05-26 17:12:36 -07:00
fcntl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
fhandle.c
fs/fhandle.c: add <linux/personality.h> for ia64
2011-04-14 16:06:56 -07:00
fifo.c
Filesystem: fifo: Fixed coding style issue.
2011-03-21 00:16:09 -04:00
file_table.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-03-16 13:26:17 -07:00
file.c
vfs: avoid large kmalloc()s for the fdtable
2011-04-28 11:28:20 -07:00
filesystems.c
fs: synchronize_rcu when unregister_filesystem success not failure
2011-04-17 10:42:01 -07:00
fs_struct.c
sanitize vfsmount refcounting changes
2011-01-16 13:47:07 -05:00
fs-writeback.c
writeback: update dirtied_when for synced inode to prevent livelock
2011-06-08 08:25:20 +08:00
generic_acl.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
inode.c
fs: cosmetic inode.c cleanups
2011-05-27 09:43:00 -04:00
internal.h
fs: move i_wb_list out from under inode_lock
2011-03-24 21:17:51 -04:00
ioctl.c
vfs: cleanup do_vfs_ioctl()
2011-03-21 00:16:08 -04:00
ioprio.c
…
Kconfig
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2011-05-26 09:52:14 -07:00
Kconfig.binfmt
…
libfs.c
libfs: drop unneeded dentry_unhash
2011-05-26 07:26:50 -04:00
locks.c
Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
2011-03-24 08:20:39 -07:00
Makefile
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
2011-03-16 19:01:29 -07:00
mbcache.c
vmscan: change shrinker API by passing shrink_control struct
2011-05-25 08:39:26 -07:00
mpage.c
mm/fs: add hooks to support cleancache
2011-05-26 10:01:43 -06:00
namei.c
vfs: shrink_dcache_parent before rmdir, dir rename
2011-05-30 01:48:27 -04:00
namespace.c
fs/namespace.c: bound mount propagation fix
2011-05-26 07:26:44 -04:00
nfsctl.c
open-style analog of vfs_path_lookup()
2011-03-14 09:15:28 -04:00
no-block.c
…
open.c
fs: Use BUG_ON(!mnt) at dentry_open().
2011-03-21 01:10:41 -04:00
pipe.c
Fix broken "pipe: use event aware wakeups" optimization
2011-01-20 16:21:59 -08:00
pnode.c
fs: scale mntget/mntput
2011-01-07 17:50:33 +11:00
pnode.h
…
posix_acl.c
NFS: Prevent memory allocation failure in nfsacl_encode()
2011-01-25 15:24:47 -05:00
read_write.c
fix signedness mess in rw_verify_area() on 64bit architectures
2011-01-12 20:06:58 -05:00
read_write.h
…
readdir.c
…
select.c
select: remove unused MAX_SELECT_SECONDS
2011-03-21 00:16:08 -04:00
seq_file.c
…
signalfd.c
…
splice.c
splice: add wakeup_pipe_readers()
2011-05-23 19:58:53 +02:00
stack.c
…
stat.c
readlinkat(), fchownat() and fstatat() with empty relative pathnames
2011-03-15 02:21:45 -04:00
statfs.c
clean statfs-like syscalls up
2011-03-14 09:15:28 -04:00
super.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem
2011-05-26 10:50:56 -07:00
sync.c
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
timerfd.c
timerfd: Manage cancelable timers in timerfd
2011-05-23 13:59:53 +02:00
utimes.c
userns: rename is_owner_or_cap to inode_owner_or_capable
2011-03-23 19:47:13 -07:00
xattr_acl.c
…
xattr.c
Cache xattr security drop check for write v2
2011-05-28 12:02:09 -04:00