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9aa05000f2
linux/fs/xfs
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Dave Chinner 9aa05000f2 xfs: xfs_sync_data is redundant. 
We don't do any data writeback from XFS any more - the VFS is
completely responsible for that, including for freeze. We can
replace the remaining caller with a VFS level function that
achieves the same thing, but without conflicting with current
writeback work.

This means we can remove the flush_work and xfs_flush_inodes() - the
VFS functionality completely replaces the internal flush queue for
doing this writeback work in a separate context to avoid stack
overruns.

This does have one complication - it cannot be called with page
locks held.  Hence move the flushing of delalloc space when ENOSPC
occurs back up into xfs_file_aio_buffered_write when we don't hold
any locks that will stall writeback.

Unfortunately, writeback_inodes_sb_if_idle() is not sufficient to
trigger delalloc conversion fast enough to prevent spurious ENOSPC
whent here are hundreds of writers, thousands of small files and GBs
of free RAM.  Hence we need to use sync_sb_inodes() to block callers
while we wait for writeback like the previous xfs_flush_inodes
implementation did.

That means we have to hold the s_umount lock here, but because this
call can nest inside i_mutex (the parent directory in the create
case, held by the VFS), we have to use down_read_trylock() to avoid
potential deadlocks. In practice, this trylock will succeed on
almost every attempt as unmount/remount type operations are
exceedingly rare.

Note: we always need to pass a count of zero to
generic_file_buffered_write() as the previously written byte count.
We only do this by accident before this patch by the virtue of ret
always being zero when there are no errors. Make this explicit
rather than needing to specifically zero ret in the ENOSPC retry
case.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Tested-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-10-17 12:01:25 -05:00
..
Kconfig
kmem.c xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
kmem.h xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
Makefile xfs: move xfs_do_force_shutdown() and kill xfs_rw.c 2012-05-14 16:20:59 -05:00
mrlock.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
time.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_acl.c userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr 2012-09-18 01:01:35 -07:00
xfs_acl.h xfs: Fix build breakage in xfs_iops.c when CONFIG_FS_POSIX_ACL is not set 2011-08-01 02:35:04 -04:00
xfs_ag.h xfs: move busy extent handling to it's own file 2012-05-14 16:20:55 -05:00
xfs_alloc_btree.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_alloc_btree.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_alloc.c xfs: don't defer metadata allocation to the workqueue 2012-07-13 13:09:27 -05:00
xfs_alloc.h xfs: move busy extent handling to it's own file 2012-05-14 16:20:55 -05:00
xfs_aops.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
xfs_aops.h Prefix IO_XX flags with XFS_IO_XX to avoid namespace colision. 2012-07-22 11:00:55 -05:00
xfs_attr_leaf.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr_leaf.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr_sf.h
xfs_attr.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr.h
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_bmap_btree.h
xfs_bmap.c xfs: make largest supported offset less shouty 2012-06-14 12:28:24 -05:00
xfs_bmap.h xfs: move xfs_fsb_to_db to xfs_bmap.h 2012-05-14 16:20:57 -05:00
xfs_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_btree.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_buf_item.c xfs: do not call xfs_bdstrat_cb in xfs_buf_iodone_callbacks 2012-07-13 13:09:49 -05:00
xfs_buf_item.h xfs: support discontiguous buffers in the xfs_buf_log_item 2012-07-01 14:50:06 -05:00
xfs_buf.c xfs: fix race while discarding buffers [V4] 2012-08-29 15:01:11 -05:00
xfs_buf.h xfs: fix race while discarding buffers [V4] 2012-08-29 15:01:11 -05:00
xfs_da_btree.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_da_btree.h xfs: fix comment typo of struct xfs_da_blkinfo. 2012-07-22 10:34:42 -05:00
xfs_dfrag.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xfs_dfrag.h
xfs_dinode.h xfs: fix typo in comment of xfs_dinode_t. 2012-06-14 12:28:26 -05:00
xfs_dir2_block.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_data.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_format.h xfs: cleanup struct xfs_dir2_free 2011-07-13 13:43:48 +02:00
xfs_dir2_leaf.c xfs: factor buffer reading from xfs_dir2_leaf_getdents 2012-07-01 14:50:08 -05:00
xfs_dir2_node.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_priv.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_sf.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2.h xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_discard.c xfs: check for possible overflow in xfs_ioc_trim 2012-08-23 14:48:44 -05:00
xfs_discard.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot_item.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_dquot_item.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_dquot.h xfs: on-stack delayed write buffer lists 2012-05-14 16:20:31 -05:00
xfs_error.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_error.h xfs: kill support/debug.[ch] 2011-03-07 10:09:35 +11:00
xfs_export.c tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
xfs_export.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_extent_busy.c xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extent_busy.h xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extfree_item.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_extfree_item.h xfs: Pull EFI/EFD handling out from under the AIL lock 2010-12-20 11:59:49 +11:00
xfs_file.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_filestream.c xfs: rename allocation range fields in struct xfs_bmalloca 2011-10-11 21:15:06 -05:00
xfs_filestream.h
xfs_fs_subr.c xfs: remove the i_size field in struct xfs_inode 2012-01-17 15:08:53 -06:00
xfs_fs.h xfs: consolidate & clarify mount sanity checks 2011-07-08 11:32:51 -05:00
xfs_fsops.c xfs: make XBF_MAPPED the default behaviour 2012-05-14 16:21:03 -05:00
xfs_fsops.h xfs: ensure log covering transactions are synchronous 2011-01-11 20:28:17 -06:00
xfs_globals.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ialloc_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ialloc_btree.h
xfs_ialloc.c xfs: Fix m_agirotor reset during AG selection 2012-09-26 15:42:42 -05:00
xfs_ialloc.h xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_iget.c xfs: remove iolock lock classes 2012-07-29 16:23:51 -05:00
xfs_inode_item.c xfs: check for stale inode before acquiring iflock on push 2012-06-21 14:20:06 -05:00
xfs_inode_item.h xfs: pass shutdown method into xfs_trans_ail_delete_bulk 2012-05-14 16:20:33 -05:00
xfs_inode.c xfs: do not take the iolock in xfs_inactive 2012-07-29 16:16:49 -05:00
xfs_inode.h xfs: remove iolock lock classes 2012-07-29 16:23:51 -05:00
xfs_inum.h xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ioctl32.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_ioctl32.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xfs_ioctl.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_iomap.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_iomap.h xfs: kill xfs_iomap 2010-12-16 16:05:51 -06:00
xfs_iops.c xfs: update for 3.6-rc1 2012-07-30 13:37:53 -07:00
xfs_iops.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_itable.c xfs: merge xfs_itobp into xfs_imap_to_bp 2012-07-22 10:46:56 -05:00
xfs_itable.h
xfs_linux.h xfs: revert to using a kthread for AIL pushing 2011-10-11 11:02:49 -05:00
xfs_log_cil.c xfs: rename log structure to xlog 2012-06-21 14:21:11 -05:00
xfs_log_priv.h xfs: sync work is now only periodic log work 2012-10-17 11:53:29 -05:00
xfs_log_recover.c xfs: merge xfs_itobp into xfs_imap_to_bp 2012-07-22 10:46:56 -05:00
xfs_log_recover.h
xfs_log.c xfs: Bring some sanity to log unmounting 2012-10-17 11:57:10 -05:00
xfs_log.h xfs: sync work is now only periodic log work 2012-10-17 11:53:29 -05:00
xfs_message.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_message.h treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
xfs_mount.c xfs: Bring some sanity to log unmounting 2012-10-17 11:57:10 -05:00
xfs_mount.h xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_mru_cache.c xfs: convert to alloc_workqueue() 2011-02-01 11:42:43 +01:00
xfs_mru_cache.h
xfs_qm_bhv.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_qm_syscalls.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_qm.c xfs: make largest supported offset less shouty 2012-06-14 12:28:24 -05:00
xfs_qm.h xfs: remove the global xfs_Gqm structure 2012-03-14 12:06:32 -05:00
xfs_quota_priv.h xfs: use per-filesystem radix trees for dquot lookup 2012-03-14 11:09:06 -05:00
xfs_quota.h Define new macro XFS_ALL_QUOTA_ACTIVE and simply some usage 2012-02-03 11:32:20 -06:00
xfs_quotaops.c userns: Convert qutoactl 2012-09-18 01:01:39 -07:00
xfs_rename.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_rtalloc.c xfs: fix uninitialised variable in xfs_rtbuf_get() 2012-08-23 14:48:16 -05:00
xfs_rtalloc.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_sb.h xfs: kill the unused XFS_BB_FSB_OFFSET macro 2012-02-02 17:08:04 -06:00
xfs_stats.c xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_stats.h xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_super.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_super.h xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_sync.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_sync.h xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_sysctl.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_sysctl.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_trace.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trace.h xfs: kill struct declarations in xfs_mount.h 2012-08-16 13:29:35 -05:00
xfs_trans_ail.c xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_buf.c xfs: add discontiguous buffer support to transactions 2012-07-01 14:50:06 -05:00
xfs_trans_dquot.c userns: Convert quota netlink aka quota_send_warning 2012-09-18 01:01:40 -07:00
xfs_trans_extfree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_trans_inode.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trans_priv.h xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_space.h
xfs_trans.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_trans.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
xfs_types.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_utils.c xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_utils.h xfs: propagate umode_t 2012-01-03 22:55:00 -05:00
xfs_vnode.h xfs: remove remaining scraps of struct xfs_iomap 2012-03-15 13:40:16 -05:00
xfs_vnodeops.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_vnodeops.h xfs: remove remaining scraps of struct xfs_iomap 2012-03-15 13:40:16 -05:00
xfs_xattr.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs.h xfs: don't expect xfs headers to be in subdirectories 2011-08-12 13:57:55 -05:00