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Brian Foster dc06f398f0 xfs: run an eofblocks scan on ENOSPC/EDQUOT 
From: Brian Foster <bfoster@redhat.com>

Speculative preallocation and and the associated throttling metrics
assume we're working with large files on large filesystems. Users have
reported inefficiencies in these mechanisms when we happen to be dealing
with large files on smaller filesystems. This can occur because while
prealloc throttling is aggressive under low free space conditions, it is
not active until we reach 5% free space or less.

For example, a 40GB filesystem has enough space for several files large
enough to have multi-GB preallocations at any given time. If those files
are slow growing, they might reserve preallocation for long periods of
time as well as avoid the background scanner due to frequent
modification. If a new file is written under these conditions, said file
has no access to this already reserved space and premature ENOSPC is
imminent.

To handle this scenario, modify the buffered write ENOSPC handling and
retry sequence to invoke an eofblocks scan. In the smaller filesystem
scenario, the eofblocks scan resets the usage of preallocation such that
when the 5% free space threshold is met, throttling effectively takes
over to provide fair and efficient preallocation until legitimate
ENOSPC.

The eofblocks scan is selective based on the nature of the failure. For
example, an EDQUOT failure in a particular quota will use a filtered
scan for that quota. Because we don't know which quota might have caused
an allocation failure at any given time, we include each applicable
quota determined to be under low free space conditions in the scan.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-07-24 19:49:28 +10:00
..
libxfs xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
Kconfig xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
kmem.c xfs: use NOIO contexts for vm_map_ram 2014-03-07 16:19:14 +11:00
kmem.h xfs: simplify kmem_{zone_}zalloc 2013-11-06 16:31:27 -06:00
Makefile libxfs: move source files 2014-06-25 14:57:53 +10:00
mrlock.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
time.h
uuid.c
uuid.h xfs: add CRC infrastructure 2012-11-19 20:11:24 -06:00
xfs_acl.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_acl.h xfs: use generic posix ACL infrastructure 2014-01-25 23:58:21 -05:00
xfs_aops.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_aops.h direct-io: Implement generic deferred AIO completions 2013-09-04 09:23:46 -04:00
xfs_attr_inactive.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_attr_list.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_attr.h xfs: kill xfs_vnodeops.[ch] 2013-08-12 16:53:39 -05:00
xfs_bit.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_bmap_util.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_bmap_util.h xfs: block allocation work needs to be kswapd aware 2014-06-06 15:59:59 +10:00
xfs_buf_item.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_buf_item.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_buf.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_buf.h xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_dir2_readdir.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_discard.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_discard.h
xfs_dquot_item.c xfs: remove the quotaoff log format from the quotaoff log item 2013-12-13 11:34:08 +11:00
xfs_dquot_item.h xfs: remove the quotaoff log format from the quotaoff log item 2013-12-13 11:34:08 +11:00
xfs_dquot.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_dquot.h xfs: run an eofblocks scan on ENOSPC/EDQUOT 2014-07-24 19:49:28 +10:00
xfs_error.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_error.h xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_export.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_export.h
xfs_extent_busy.c xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_extent_busy.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_extfree_item.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_extfree_item.h xfs: split out EFI/EFD log item format definition 2013-08-12 16:07:13 -05:00
xfs_file.c xfs: run an eofblocks scan on ENOSPC/EDQUOT 2014-07-24 19:49:28 +10:00
xfs_filestream.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_filestream.h xfs: add filestream allocator tracepoints 2014-04-23 07:11:52 +10:00
xfs_fs.h xfs: support a union-based filter for eofblocks scans 2014-07-24 19:44:28 +10:00
xfs_fsops.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_fsops.h
xfs_globals.c
xfs_icache.c xfs: run an eofblocks scan on ENOSPC/EDQUOT 2014-07-24 19:49:28 +10:00
xfs_icache.h xfs: run an eofblocks scan on ENOSPC/EDQUOT 2014-07-24 19:49:28 +10:00
xfs_icreate_item.c xfs: format log items write directly into the linear CIL buffer 2013-12-13 11:34:02 +11:00
xfs_icreate_item.h xfs: separate icreate log format definitions from xfs_icreate_item.h 2013-08-12 16:10:35 -05:00
xfs_inode_item.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_inode_item.h xfs: remove the inode log format from the inode log item 2013-12-13 11:34:05 +11:00
xfs_inode.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_inode.h Merge branch 'xfs-feature-bit-cleanup' into for-next 2014-05-20 08:57:02 +10:00
xfs_ioctl32.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_ioctl32.h
xfs_ioctl.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_ioctl.h xfs: consolidate extent swap code 2013-08-12 16:56:06 -05:00
xfs_iomap.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_iomap.h xfs: get rid of count from xfs_iomap_write_allocate() 2013-10-01 15:42:34 -05:00
xfs_iops.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_iops.h xfs: use generic posix ACL infrastructure 2014-01-25 23:58:21 -05:00
xfs_itable.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_itable.h
xfs_linux.h xfs: return is not a function 2014-06-22 15:03:54 +10:00
xfs_log_cil.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_log_priv.h xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_log_recover.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_log.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_log.h xfs: log vector rounding leaks log space 2014-05-20 08:18:09 +10:00
xfs_message.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_message.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00
xfs_mount.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_mount.h xfs: move node entry counts to xfs_da_geometry 2014-06-06 15:20:02 +10:00
xfs_mru_cache.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_mru_cache.h xfs: embedd mru_elem into parent structure 2014-04-23 07:11:51 +10:00
xfs_qm_bhv.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_qm_syscalls.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_qm.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_qm.h xfs: integrate xfs_quota_priv header file to xfs_qm 2013-12-06 14:16:33 -06:00
xfs_quota.h xfs: split dquot buffer operations out 2013-10-23 14:28:35 -05:00
xfs_quotaops.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_rtalloc.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_rtalloc.h xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_stats.c xfs: support the XFS_BTNUM_FINOBT free inode btree type 2014-04-24 16:00:52 +10:00
xfs_stats.h xfs: support the XFS_BTNUM_FINOBT free inode btree type 2014-04-24 16:00:52 +10:00
xfs_super.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_super.h
xfs_symlink.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_symlink.h xfs: push down inactive transaction mgmt for remote symlinks 2013-10-08 14:53:02 -05:00
xfs_sysctl.c xfs: Convert use of typedef ctl_table to struct ctl_table 2013-06-17 17:42:25 -05:00
xfs_sysctl.h
xfs_trace.c xfs: add filestream allocator tracepoints 2014-04-23 07:11:52 +10:00
xfs_trace.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
xfs_trans_ail.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_trans_buf.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_trans_dquot.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_trans_extfree.c xfs: decouple log and transaction headers 2013-10-23 16:17:44 -05:00
xfs_trans_inode.c xfs: open code inc_inode_iversion when logging an inode 2013-11-18 09:42:08 -06:00
xfs_trans_priv.h xfs: remove unused ail pointer arg from xfs_trans_ail_cursor_done() 2014-04-14 19:06:05 +10:00
xfs_trans.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs_trans.h xfs: format log items write directly into the linear CIL buffer 2013-12-13 11:34:02 +11:00
xfs_types.h xfs: support the XFS_BTNUM_FINOBT free inode btree type 2014-04-24 16:00:52 +10:00
xfs_vnode.h xfs: remove unused FI_ flags 2013-12-04 14:11:05 -06:00
xfs_xattr.c xfs: global error sign conversion 2014-06-25 14:58:08 +10:00
xfs.h xfs: introduce CONFIG_XFS_WARN 2013-05-07 18:45:36 -05:00