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* fs: sys_sync fixNick Piggin2009-01-061-19/+1
| | | | | | | | | | | | | | s_syncing livelock avoidance was breaking data integrity guarantee of sys_sync, by allowing sys_sync to skip writing or waiting for superblocks if there is a concurrent sys_sync happening. This livelock avoidance is much less important now that we don't have the get_super_to_sync() call after every sb that we sync. This was replaced by __put_super_and_need_restart. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: sync_sb_inodes fixNick Piggin2009-01-061-7/+53
| | | | | | | | | | Fix data integrity semantics required by sys_sync, by iterating over all inodes and waiting for any writeback pages after the initial writeout. Comments explain the exact problem. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: remove WB_SYNC_HOLDNick Piggin2009-01-061-10/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Remove WB_SYNC_HOLD. The primary motiviation is the design of my anti-starvation code for fsync. It requires taking an inode lock over the sync operation, so we could run into lock ordering problems with multiple inodes. It is possible to take a single global lock to solve the ordering problem, but then that would prevent a future nice implementation of "sync multiple inodes" based on lock order via inode address. Seems like a backward step to remove this, but actually it is busted anyway: we can't use the inode lists for data integrity wait: an inode can be taken off the dirty lists but still be under writeback. In order to satisfy data integrity semantics, we should wait for it to finish writeback, but if we only search the dirty lists, we'll miss it. It would be possible to have a "writeback" list, for sys_sync, I suppose. But why complicate things by prematurely optimise? For unmounting, we could avoid the "livelock avoidance" code, which would be easier, but again premature IMO. Fixing the existing data integrity problem will come next. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Remove Andrew Morton's old email accountsFrancois Cami2008-10-161-1/+1
| | | | | | | | | People can use the real name an an index into MAINTAINERS to find the current email address. Signed-off-by: Francois Cami <francois.cami@free.fr> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* VFS: export sync_sb_inodesArtem Bityutskiy2008-07-141-2/+9
| | | | | | | | | | This patch exports the 'sync_sb_inodes()' which is needed for UBIFS because it has to force write-back from time to time. Namely, the UBIFS budgeting subsystem forces write-back when its pessimistic callculations show that there is no free space on the media. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* VFS: move inode_lock into sync_sb_inodesHans Reiser2008-07-141-8/+3
| | | | | | | | | | This patch makes 'sync_sb_inodes()' lock 'inode_lock', rather than expect that the caller will do this. This change was previously done by Hans Reiser <reiser@namesys.com> and sat in the -mm tree. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* fs/fs-writeback.c: make 2 functions staticAdrian Bunk2008-04-291-39/+39
| | | | | | | | | | | Make the following needlessly global functions static: - writeback_acquire() - writeback_release() Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: fix kernel-doc notation warningsRandy Dunlap2008-03-191-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix kernel-doc notation warnings in fs/. Warning(mmotm-2008-0314-1449//fs/super.c:560): missing initial short description on line: * mark_files_ro Warning(mmotm-2008-0314-1449//fs/locks.c:1277): missing initial short description on line: * lease_get_mtime Warning(mmotm-2008-0314-1449//fs/locks.c:1277): missing initial short description on line: * lease_get_mtime Warning(mmotm-2008-0314-1449//fs/namei.c:1368): missing initial short description on line: * lookup_one_len: filesystem helper to lookup single pathname component Warning(mmotm-2008-0314-1449//fs/buffer.c:3221): missing initial short description on line: * bh_uptodate_or_lock: Test whether the buffer is uptodate Warning(mmotm-2008-0314-1449//fs/buffer.c:3240): missing initial short description on line: * bh_submit_read: Submit a locked buffer for reading Warning(mmotm-2008-0314-1449//fs/fs-writeback.c:30): missing initial short description on line: * writeback_acquire: attempt to get exclusive writeback access to a device Warning(mmotm-2008-0314-1449//fs/fs-writeback.c:47): missing initial short description on line: * writeback_in_progress: determine whether there is writeback in progress Warning(mmotm-2008-0314-1449//fs/fs-writeback.c:58): missing initial short description on line: * writeback_release: relinquish exclusive writeback access against a device. Warning(mmotm-2008-0314-1449//include/linux/jbd.h:351): contents before sections Warning(mmotm-2008-0314-1449//include/linux/jbd.h:561): contents before sections Warning(mmotm-2008-0314-1449//fs/jbd/transaction.c:1935): missing initial short description on line: * void journal_invalidatepage() Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* write_inode_now(): avoid unnecessary synchronous writeMike Galbraith2008-02-081-1/+1
| | | | | | | | | | We shouldn't use WB_SYNC_ALL if the caller is asking for asynchronous treatment. Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: use list_for_each_entry_reverse and kill sb_entryAkinobu Mita2008-02-061-5/+2
| | | | | | | | | Use list_for_each_entry_reverse for super_blocks list and remove unused sb_entry macro. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: speed up writeback of big dirty filesFengguang Wu2008-02-051-2/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After making dirty a 100M file, the normal behavior is to start the writeback for all data after 30s delays. But sometimes the following happens instead: - after 30s: ~4M - after 5s: ~4M - after 5s: all remaining 92M Some analyze shows that the internal io dispatch queues goes like this: s_io s_more_io ------------------------- 1) 100M,1K 0 2) 1K 96M 3) 0 96M 1) initial state with a 100M file and a 1K file 2) 4M written, nr_to_write <= 0, so write more 3) 1K written, nr_to_write > 0, no more writes(BUG) nr_to_write > 0 in (3) fools the upper layer to think that data have all been written out. The big dirty file is actually still sitting in s_more_io. We cannot simply splice s_more_io back to s_io as soon as s_io becomes empty, and let the loop in generic_sync_sb_inodes() continue: this may starve newly expired inodes in s_dirty. It is also not an option to draw inodes from both s_more_io and s_dirty, an let the loop go on: this might lead to live locks, and might also starve other superblocks in sync time(well kupdate may still starve some superblocks, that's another bug). We have to return when a full scan of s_io completes. So nr_to_write > 0 does not necessarily mean that "all data are written". This patch introduces a flag writeback_control.more_io to indicate that more io should be done. With it the big dirty file no longer has to wait for the next kupdate invokation 5s later. In sync_sb_inodes() we only set more_io on super_blocks we actually visited. This avoids the interaction between two pdflush deamons. Also in __sync_single_inode() we don't blindly keep requeuing the io if the filesystem cannot progress. Failing to do so may lead to 100% iowait. Tested-by: Mike Snitzer <snitzer@gmail.com> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* skip writing data pages when inode is under I_SYNCQi Yong2008-02-051-12/+1
| | | | | | | | | | | | | | | | | | | Since I_SYNC was split out from I_LOCK, the concern in commit 4b89eed93e0fa40a63e3d7b1796ec1337ea7a3aa ("Write back inode data pages even when the inode itself is locked") is not longer valid. We should revert to the original behavior: in __writeback_single_inode(), when we find an I_SYNC-ed inode and we're not doing a data-integrity sync, skip writing entirely. Otherwise, we are double calling do_writepages() Signed-off-by: Qi Yong <qiyong@fc-cn.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Hugh Dickins <hugh@veritas.com> Cc: Joern Engel <joern@wohnheim.fh-wedel.de> Cc: WU Fengguang <wfg@mail.ustc.edu.cn> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Revert "writeback: introduce writeback_control.more_io to indicate more io"Linus Torvalds2008-01-141-2/+0
| | | | | | | | | | | | | | | | | | | This reverts commit 2e6883bdf49abd0e7f0d9b6297fc3be7ebb2250b, as requested by Fengguang Wu. It's not quite fully baked yet, and while there are patches around to fix the problems it caused, they should get more testing. Says Fengguang: "I'll resend them both for -mm later on, in a more complete patchset". See http://bugzilla.kernel.org/show_bug.cgi?id=9738 for some of this discussion. Requested-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Use helpers to obtain task pid in printksPavel Emelyanov2007-10-191-1/+1
| | | | | | | | | | | | | | | | The task_struct->pid member is going to be deprecated, so start using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in the kernel. The first thing to start with is the pid, printed to dmesg - in this case we may safely use task_pid_nr(). Besides, printks produce more (much more) than a half of all the explicit pid usage. [akpm@linux-foundation.org: git-drm went and changed lots of stuff] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Dave Airlie <airlied@linux.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* introduce I_SYNCJoern Engel2007-10-171-15/+24
| | | | | | | | | | | | | | | | | | | | I_LOCK was used for several unrelated purposes, which caused deadlock situations in certain filesystems as a side effect. One of the purposes now uses the new I_SYNC bit. Also document the various bits and change their order from historical to logical. [bunk@stusta.de: make fs/inode.c:wake_up_inode() static] Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de> Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Cc: David Chinner <dgc@sgi.com> Cc: Anton Altaparmakov <aia21@cam.ac.uk> Cc: Al Viro <viro@ftp.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: introduce writeback_control.more_io to indicate more ioFengguang Wu2007-10-171-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After making dirty a 100M file, the normal behavior is to start the writeback for all data after 30s delays. But sometimes the following happens instead: - after 30s: ~4M - after 5s: ~4M - after 5s: all remaining 92M Some analyze shows that the internal io dispatch queues goes like this: s_io s_more_io ------------------------- 1) 100M,1K 0 2) 1K 96M 3) 0 96M 1) initial state with a 100M file and a 1K file 2) 4M written, nr_to_write <= 0, so write more 3) 1K written, nr_to_write > 0, no more writes(BUG) nr_to_write > 0 in (3) fools the upper layer to think that data have all been written out. The big dirty file is actually still sitting in s_more_io. We cannot simply splice s_more_io back to s_io as soon as s_io becomes empty, and let the loop in generic_sync_sb_inodes() continue: this may starve newly expired inodes in s_dirty. It is also not an option to draw inodes from both s_more_io and s_dirty, an let the loop go on: this might lead to live locks, and might also starve other superblocks in sync time(well kupdate may still starve some superblocks, that's another bug). We have to return when a full scan of s_io completes. So nr_to_write > 0 does not necessarily mean that "all data are written". This patch introduces a flag writeback_control.more_io to indicate this situation. With it the big dirty file no longer has to wait for the next kupdate invocation 5s later. Cc: David Chinner <dgc@sgi.com> Cc: Ken Chen <kenchen@google.com> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix ntfs with sb_has_dirty_inodes()Fengguang Wu2007-10-171-1/+9
| | | | | | | | | | | NTFS's if-condition on dirty inodes is not complete. Fix it with sb_has_dirty_inodes(). Cc: Anton Altaparmakov <aia21@cantab.net> Cc: Ken Chen <kenchen@google.com> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock inode lists 8Fengguang Wu2007-10-171-23/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | Streamline the management of dirty inode lists and fix time ordering bugs. The writeback logic used to move not-yet-expired dirty inodes from s_dirty to s_io, *only to* move them back. The move-inodes-back-and-forth thing is a mess, which is eliminated by this patch. The new scheme is: - s_dirty acts as a time ordered io delaying queue; - s_io/s_more_io together acts as an io dispatching queue. On kupdate writeback, we pull some inodes from s_dirty to s_io at the start of every full scan of s_io. Otherwise (i.e. for sync/throttle/background writeback), we always pull from s_dirty on each run (a partial scan). Note that the line list_splice_init(&sb->s_more_io, &sb->s_io); is moved to queue_io() to leave s_io empty. Otherwise a big dirtied file will sit in s_io for a long time, preventing new expired inodes to get in. Cc: Ken Chen <kenchen@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix periodic superblock dirty inode flushingKen Chen2007-10-171-22/+14
| | | | | | | | | | | | | | | | | | | | | | | | | Current -mm tree has bucketful of bug fixes in periodic writeback path. However, we still hit a glitch where dirty pages on a given inode aren't completely flushed to the disk, and system will accumulate large amount of dirty pages beyond what dirty_expire_interval is designed for. The problem is __sync_single_inode() will move an inode to sb->s_dirty list even when there are more pending dirty pages on that inode. If there is another inode with a small number of dirty pages, we hit a case where the loop iteration in wb_kupdate() terminates prematurely because wbc.nr_to_write > 0. Thus leaving the inode that has large amount of dirty pages behind and it has to wait for another dirty_writeback_interval before we flush it again. We effectively only write out MAX_WRITEBACK_PAGES every dirty_writeback_interval. If the rate of dirtying is sufficiently high, the system will start accumulate a large number of dirty pages. So fix it by having another sb->s_more_io list on which to park the inode while we iterate through sb->s_io and to allow each dirty inode which resides on that sb to have an equal chance of flushing some amount of dirty pages. Signed-off-by: Ken Chen <kenchen@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists 7Andrew Morton2007-10-171-2/+2
| | | | | | | | | | | | | | | | | | | | | This one fixes four bugs. There are a few situation in there where writeback decides it is going to skip over a blockdev inode on the kernel-internal blockdev superblock. It presently does this by moving the blockdev inode onto the tail of the blockdev superblock's s_dirty. But a) this screws up s_dirty's reverse-time-orderedness and b) refiling the blockdev for writeback in another 30 second is rude. We should try again sooner than that. Fix all this up by using redirty_head(): move the blockdev inode onto the head of the blockdev superblock's s_dirty list for prompt writeback. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists 6Andrew Morton2007-10-171-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Recycling the previous changelog: When the writeback function is operating in writeback-for-flushing mode (as opposed to writeback-for-integrity) and it encounters an I_LOCKed inode, it will skip writing that inode. This is done for throughput and latency: move on to another inode rather than blocking for this one. Writeback skips this inode by moving it off s_io and onto s_dirty, so that writeback can proceed with the other inodes on s_io. However that inode movement can corrupt s_dirty's reverse-time-orderedness. Fix that by using the new redirty_tail(), which will update the refiled inode's dirtied_when field. Note: the behaviour in here is a bit rude: if kupdate happens to come across a locked inode then it will defer writeback of that inode for another 30 seconds. We'll address that in the next patch. Address that here. What we do is to move the skipped inode to the _head_ of s_dirty, immediately eligible for writeout again. Instead of deferring that writeout for another 30 seconds. One would think that this might cause a livelock: we keep on trying to write the same locked inode. But it won't because: a) if that was the case, it would _already_ be happening on the balance_dirty_pages codepath. Because balance_dirty_pages() doesn't care about inode timestamps. b) if we skipped this inode then we won't have done any writeback. The higher-level writeback paths will see that wbc.nr_to_write didn't change and they'll then back off and take a nap. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists 5Andrew Morton2007-10-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | When the writeback function is operating in writeback-for-flushing mode (as opposed to writeback-for-integrity) and it encounters an I_LOCKed inode, it will skip writing that inode. This is done for throughput and latency: move on to another inode rather than blocking for this one. Writeback skips this inode by moving it off s_io and onto s_dirty, so that writeback can proceed with the other inodes on s_io. However that inode movement can corrupt s_dirty's reverse-time-orderedness. Fix that by using the new redirty_tail(), which will update the refiled inode's dirtied_when field. Note: the behaviour in here is a bit rude: if kupdate happens to come across a locked inode then it will defer writeback of that inode for another 30 seconds. We'll address that in the next patch. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix comment, use helper functionAndrew Morton2007-10-171-4/+11
| | | | | | | | | | | | | | | | | | There's a comment in there which claims that the inode is left on s_io if nfs chickened out of writing some data. But that's not been true for three years. 9290280ced13c85689adeffa587e9a53bd3a5873 fixed a livelock by moving these inodes back onto s_dirty. Fix the comment. In the second leg of the `if', use redirty_tail() rather than open-coding it. Add weaselly comment indicating lack of confidence in the code and lack of the fortitude which would be needed to fiddle with it. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists 4Andrew Morton2007-10-171-1/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the kupdate function has tried to write back an expired inode it will then check to see whether some of the inode's pages are still dirty. This can happen when the filesystem decided to not write a page for some reason. But it does _not_ occur due to redirtyings: a redirtying will set I_DIRTY_PAGES. What we need to do here is to set I_DIRTY_PAGES to reflect reality and to then put the inode onto the _head_ of s_dirty for consideration on the next kupdate pass, in five seconds time. Problem is, the code failed to modify the inode's timestamp when pushing the inode onto thehead of s_dirty. The patch: If there are no other inodes on s_dirty then we leave the inode's timestamp alone: it is already expired. If there _are_ other inodes on s_dirty then we arrange for this inode to get the same timestamp as the inode which is at the head of s_dirty, thus preserving the s_dirty ordering. But we only need to do this if this inode purports to have been dirtied before the one at head-of-list. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists 3Andrew Morton2007-10-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | While writeback is working against a dirty inode it does a check after trying to write some of the inode's pages: "did the lower layers skip some of the inode's dirty pages because they were locked (or under writeback, or whatever)" If this turns out to be true, we must move the inode back onto s_dirty and redirty it. The reason for doing this is that fsync() and friends only check the s_dirty list, and those functions want to know about those pages which were locked, so they can be waited upon and, if necessary, rewritten. Problem is, that redirtying was putting the inode onto the tail of s_dirty without updating its timestamp. This causes a violation of s_dirty ordering. Fix this by updating inode->dirtied_when when moving the inode onto s_dirty. But the code is still a bit buggy? If the inode was _already_ dirty then we don't need to move it at all. Oh well, hopefully it doesn't matter too much, as that was a redirtying, which was very recent anwyay. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time ordering of the per superblock dirty inode lists: ↵Andrew Morton2007-10-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | memory-backed inodes For reasons which escape me, inodes which are dirty against a ram-backed filesystem are managed in the same way as inodes which are backed by real devices. Probably we could optimise things here. But given that we skip the entire supeblock as son as we hit the first dirty inode, there's not a lot to be gained. And the code does need to handle one particular non-backed superblock: the kernel's fake internal superblock which holds all the blockdevs. Still. At present when the code encounters an inode which is dirty against a memory-backed filesystem it will skip that inode by refiling it back onto s_dirty. But it fails to update the inode's timestamp when doing so which at least makes the debugging code upset. Fix. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* writeback: fix time-ordering of the per-superblock dirty-inode listsAndrew Morton2007-10-171-1/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | When writeback has finished writing back an inode it looks to see if that inode is still dirty. If it is, that means that a process redirtied the inode while its writeback was in progress. What we need to do here is to refile the redirtied inode onto the s_dirty list. But we're doing that wrongly: it could be that this inode was redirtied _before_ the last inode on s_dirty. We're blindly appending this inode to the list, after an inode which might be less-recently-dirtied, thus violating the list's ordering. So we must either insertion-sort this inode into the correct place, or we must update this inode's dirtied_when field when appending it to the reverse-sorted s_dirty list, to preserve the reverse-time-ordering. This patch does the latter: if this inode was dirtied less recently than the tail inode then copy the tail inode's timestamp into this inode. This means that in rare circumstances, some inodes will be writen back later than they should have been. But the time slip will be small. Cc: Mike Waychison <mikew@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Fix warnings with !CONFIG_BLOCKJens Axboe2007-10-101-0/+1
| | | | | | | | Hide everything in blkdev.h with CONFIG_BLOCK isn't set, and fixup the (few) files that fail to build because they were relying on blkdev.h pulling in extra includes for them. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Write back inode data pages even when the inode itself is lockedLinus Torvalds2007-01-261-1/+12
| | | | | | | | | | | | | | | | | | In __writeback_single_inode(), when we find a locked inode and we're not doing a data-integrity sync, we used to just skip writing entirely, since we didn't want to wait for the inode to unlock. However, there's really no reason to skip writing the data pages, which are likely to be the the bulk of the dirty state anyway (and the main reason why writeback was started for the non-data-integrity case, of course!) Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Andrew Morton <akpm@osdl.org>, Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Hugh Dickins <hugh@veritas.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #6]David Howells2006-09-301-3/+3
| | | | | | | | Move blockdev_superblock extern declaration from fs/fs-writeback.c to a headerfile and remove the dependence on it by wrapping it in a macro. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* [PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6]David Howells2006-09-301-2/+1
| | | | | | | | | | | Create a new header file, fs/internal.h, for common definitions local to the sources in the fs/ directory. Move extern definitions that should be in header files from fs/*.c to fs/internal.h or other main header files where they span directories. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* [PATCH] zoned vm counters: conversion of nr_unstable to per zone counterChristoph Lameter2006-06-301-1/+1
| | | | | | | | | | | | | | | | | | | Conversion of nr_unstable to a per zone counter We need to do some special modifications to the nfs code since there are multiple cases of disposition and we need to have a page ref for proper accounting. This converts the last critical page state of the VM and therefore we need to remove several functions that were depending on GET_PAGE_STATE_LAST in order to make the kernel compile again. We are only left with event type counters in page state. [akpm@osdl.org: bugfixes] Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] zoned vm counters: conversion of nr_dirty to per zone counterChristoph Lameter2006-06-301-1/+1
| | | | | | | | | | | | | | | This makes nr_dirty a per zone counter. Looping over all processors is avoided during writeback state determination. The counter aggregation for nr_dirty had to be undone in the NFS layer since we summed up the page counts from multiple zones. Someone more familiar with NFS should probably review what I have done. [akpm@osdl.org: bugfix] Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Kill PF_SYNCWRITE flagJens Axboe2006-06-231-2/+0
| | | | | | | | | | | | | | | A process flag to indicate whether we are doing sync io is incredibly ugly. It also causes performance problems when one does a lot of async io and then proceeds to sync it. Part of the io will go out as async, and the other part as sync. This causes a disconnect between the previously submitted io and the synced io. For io schedulers such as CFQ, this will cause us lost merges and suboptimal behaviour in scheduling. Remove PF_SYNCWRITE completely from the fsync/msync paths, and let the O_DIRECT path just directly indicate that the writes are sync by using WRITE_SYNC instead. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] writeback: fix range handlingOGAWA Hirofumi2006-06-231-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a writeback_control's `start' and `end' fields are used to indicate a one-byte-range starting at file offset zero, the required values of .start=0,.end=0 mean that the ->writepages() implementation has no way of telling that it is being asked to perform a range request. Because we're currently overloading (start == 0 && end == 0) to mean "this is not a write-a-range request". To make all this sane, the patch changes range of writeback_control. So caller does: If it is calling ->writepages() to write pages, it sets range (range_start/end or range_cyclic) always. And if range_cyclic is true, ->writepages() thinks the range is cyclic, otherwise it just uses range_start and range_end. This patch does, - Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h -1 is usually ok for range_end (type is long long). But, if someone did, range_end += val; range_end is "val - 1" u64val = range_end >> bits; u64val is "~(0ULL)" or something, they are wrong. So, this adds LLONG_MAX to avoid nasty things, and uses LLONG_MAX for range_end. - All callers of ->writepages() sets range_start/end or range_cyclic. - Fix updates of ->writeback_index. It seems already bit strange. If it starts at 0 and ended by check of nr_to_write, this last index may reduce chance to scan end of file. So, this updates ->writeback_index only if range_cyclic is true or whole-file is scanned. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Nathan Scott <nathans@sgi.com> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: Steven French <sfrench@us.ibm.com> Cc: "Vladimir V. Saveliev" <vs@namesys.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Move cond_resched() after iput() in sync_sb_inodes()OGAWA Hirofumi2006-03-251-1/+1
| | | | | | | | In here, I think the following order is more cache-friendly. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] kernel-docs: fix kernel-doc format problemsRandy Dunlap2005-11-071-2/+3
| | | | | | | | | | | | | | | Convert to proper kernel-doc format. Some have extra blank lines (not allowed immed. after the function name) or need blank lines (after all parameters). Function summary must be only one line. Colon (":") in a function description does weird things (causes kernel-doc to think that it's a new section head sadly). Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] write_inode_now(): write inode if not BDI_CAP_NO_WRITEBACKAndrew Morton2005-11-071-1/+1
| | | | | | | | | If the backing_dev_info doesn't have BDI_CAP_NO_WRITEBACK we're not supposed to write back an inode's pages. But in this situation write_inode_now() refuses to write the inode itself as well. Fix. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] fix __writeback_single_inode WARN_ONAndrea Arcangeli2005-10-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the inode count is zero in inode writeback, the WARN_ON(!(inode->i_state & I_WILL_FREE)); is broken, and needs to test for either I_WILL_FREE|I_FREEING. When the inode is in I_FREEING state, it's already out of the visibility of the vm so it can't be freed so it doesn't require the __iget and the generic_delete_inode path can call the sync internally to the lowlevel fs callback during the last iput. So the inode being in I_FREEING is also a valid condition for calling the sync with i_count == 0. The specific stack trace is this: 0xc00000007b8fb6e0 0xc00000000010118c .__writeback_single_inode +0x5c 0xc00000007b8fb6e0 0xc0000000001014dc (lr) .sync_inode +0x3c 0xc00000007b8fb790 0xc0000000001014dc .sync_inode +0x3c 0xc00000007b8fb820 0xc0000000001a5020 .ext2_sync_inode +0x64 0xc00000007b8fb8f0 0xc0000000001a65b4 .ext2_truncate +0x3f8 0xc00000007b8fba40 0xc0000000001a6940 .ext2_delete_inode +0xdc 0xc00000007b8fbac0 0xc0000000000f7a5c .generic_delete_inode +0x124 0xc00000007b8fbb50 0xc0000000000f5fe0 .iput +0xb8 0xc00000007b8fbbe0 0xc0000000000e9fd4 .sys_unlink +0x2a8 0xc00000007b8fbd10 0xc00000000001048c .ret_from_syscall_1 +0x0 Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] fix nr_unused accounting, and avoid recursing in iput with ↵Andrea Arcangeli2005-10-301-12/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I_WILL_FREE set list_move(&inode->i_list, &inode_in_use); } else { list_move(&inode->i_list, &inode_unused); + inodes_stat.nr_unused++; } } wake_up_inode(inode); Are you sure the above diff is correct? It was added somewhere between 2.6.5 and 2.6.8. I think it's wrong. The only way I can imagine the i_count to be zero in the above path, is that I_WILL_FREE is set. And if I_WILL_FREE is set, then we must not increase nr_unused. So I believe the above change is buggy and it will definitely overstate the number of unused inodes and it should be backed out. Note that __writeback_single_inode before calling __sync_single_inode, can drop the spinlock and we can have both the dirty and locked bitflags clear here: spin_unlock(&inode_lock); __wait_on_inode(inode); iput(inode); XXXXXXX spin_lock(&inode_lock); } use inode again here a construct like the above makes zero sense from a reference counting standpoint. Either we don't ever use the inode again after the iput, or the inode_lock should be taken _before_ executing the iput (i.e. a __iput would be required). Taking the inode_lock after iput means the iget was useless if we keep using the inode after the iput. So the only chance the 2.6 was safe to call __writeback_single_inode with the i_count == 0, is that I_WILL_FREE is set (I_WILL_FREE will prevent the VM to free the inode in XXXXX). Potentially calling the above iput with I_WILL_FREE was also wrong because it would recurse in iput_final (the second mainline bug). The below (untested) patch fixes the nr_unused accounting, avoids recursing in iput when I_WILL_FREE is set and makes sure (with the BUG_ON) that we don't corrupt memory and that all holders that don't set I_WILL_FREE, keeps a reference on the inode! Signed-off-by: Andrea Arcangeli <andrea@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] O(1) sb list traversing on syncsKirill Korotaev2005-06-231-37/+27
| | | | | | | | | | | This patch removes O(n^2) super block loops in sync_inodes(), sync_filesystems() etc. in favour of using __put_super_and_need_restart() which I introduced earlier. We faced a noticably long freezes on sb syncing when there are thousands of super blocks in the system. Signed-Off-By: Kirill Korotaev <dev@sw.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] DocBook: fix some descriptionsMartin Waitz2005-05-011-1/+3
| | | | | | | | | Some KernelDoc descriptions are updated to match the current code. No code changes. Signed-off-by: Martin Waitz <tali@admingilde.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds2005-04-161-0/+695
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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