AuxXxilium/linux_dsm_epyc7002
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84ca484ecf
linux_dsm_epyc7002/fs/xfs/libxfs
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Brian Foster 84ca484ecf xfs: don't discard on free of unwritten extents 
Unwritten extents by definition have not been written to until they
are converted to normal written extents. If unwritten extents are
freed from a file, it is therefore guaranteed that the blocks have
not been written to since allocation (note that zero range punches
and reallocates blocks).

To cut down on online discards generated from workloads that make
use of preallocation, skip discards of extents if they are in the
unwritten state when the extent is freed.

Note that this optimization does not apply to log recovery, during
which all freed extents are discarded if online discard is enabled.
Also note that it may be possible for a filesystem crash to occur
after write completion of an unwritten extent but before unwritten
conversion such that the extent remains unwritten after log
recovery. Since this pseudo-inconsistency may already be possible
after a crash (consider writing to recently allocated blocks where
the allocation transaction is lost after a crash), this change
shouldn't introduce any fundamental limitations that don't already
exist. In short, on storage stacks where discards are important,
it's good practice to run an occasional fstrim even with online
discard enabled in the filesystem, particularly after a crash.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2018-05-10 08:56:47 -07:00
..
xfs_ag_resv.c xfs: account only rmapbt-used blocks against rmapbt perag res 2018-03-11 20:27:57 -07:00
xfs_ag_resv.h xfs: account only rmapbt-used blocks against rmapbt perag res 2018-03-11 20:27:57 -07:00
xfs_alloc_btree.c Cleanup old XFS_BTREE_* traces 2018-03-11 20:27:55 -07:00
xfs_alloc_btree.h
xfs_alloc.c xfs: add bmapi nodiscard flag 2018-05-10 08:56:46 -07:00
xfs_alloc.h xfs: add bmapi nodiscard flag 2018-05-10 08:56:46 -07:00
xfs_attr_leaf.c Split buffer's b_fspriv field 2018-01-29 07:27:22 -08:00
xfs_attr_leaf.h xfs: create structure verifier function for shortform xattrs 2018-01-08 10:54:46 -08:00
xfs_attr_remote.c xfs: make xfs_buf_incore out of line 2018-05-09 10:04:00 -07:00
xfs_attr_remote.h
xfs_attr_sf.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_attr.c xfs: don't fail when converting shortform attr to long form during ATTR_REPLACE 2018-04-17 19:10:15 -07:00
xfs_bit.c libxfs: Optimize the loop for xfs_bitmap_empty 2016-01-04 16:10:19 +11:00
xfs_bit.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_bmap_btree.c Cleanup old XFS_BTREE_* traces 2018-03-11 20:27:55 -07:00
xfs_bmap_btree.h xfs: refactor bmap record validation 2018-03-23 18:05:07 -07:00
xfs_bmap.c xfs: don't discard on free of unwritten extents 2018-05-10 08:56:47 -07:00
xfs_bmap.h xfs: add bmapi nodiscard flag 2018-05-10 08:56:46 -07:00
xfs_btree.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_btree.h xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_cksum.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfs_da_btree.c Split buffer's b_fspriv field 2018-01-29 07:27:22 -08:00
xfs_da_btree.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_da_format.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_da_format.h xfs: refactor the geometry structure filling function 2018-01-08 10:54:48 -08:00
xfs_defer.c xfs: adder caller IP to xfs_defer* tracepoints 2018-05-10 08:56:46 -07:00
xfs_defer.h xfs: defer agfl block frees when dfops is available 2018-05-09 10:04:02 -07:00
xfs_dir2_block.c xfs: sanity-check the unused space before trying to use it 2018-03-23 18:05:07 -07:00
xfs_dir2_data.c xfs: sanity-check the unused space before trying to use it 2018-03-23 18:05:07 -07:00
xfs_dir2_leaf.c xfs: sanity-check the unused space before trying to use it 2018-03-23 18:05:07 -07:00
xfs_dir2_node.c xfs: sanity-check the unused space before trying to use it 2018-03-23 18:05:07 -07:00
xfs_dir2_priv.h xfs: refactor short form directory structure verifier function 2018-01-08 10:54:46 -08:00
xfs_dir2_sf.c xfs: directory scrubber must walk through data block to offset 2018-01-17 21:00:46 -08:00
xfs_dir2.c xfs: refactor the geometry structure filling function 2018-01-08 10:54:48 -08:00
xfs_dir2.h xfs: sanity-check the unused space before trying to use it 2018-03-23 18:05:07 -07:00
xfs_dquot_buf.c xfs: print specific dqblk that failed verifiers 2018-05-09 10:04:01 -07:00
xfs_errortag.h xfs: move error injection tags into their own file 2017-11-01 15:03:16 -07:00
xfs_format.h xfs: convert XFS_AGFL_SIZE to a helper function 2018-03-11 20:27:56 -07:00
xfs_fs.h xfs: check sb_agblocks and sb_agblklog when validating superblock 2018-01-17 21:00:47 -08:00
xfs_ialloc_btree.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_ialloc_btree.h xfs: use per-AG reservations for the finobt 2017-01-25 07:49:35 -08:00
xfs_ialloc.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_ialloc.h xfs: add scrub cross-referencing helpers for the inode btrees 2018-01-17 21:00:44 -08:00
xfs_iext_tree.c xfs: move xfs_iext_insert tracepoint to report useful information 2017-12-14 09:20:11 -08:00
xfs_inode_buf.c xfs: enhance dinode verifier 2018-04-17 17:10:17 -07:00
xfs_inode_buf.h xfs: move inode extent size hint validation to libxfs 2018-03-23 18:05:08 -07:00
xfs_inode_fork.c xfs: refactor inode verifier error logging 2018-03-23 18:05:07 -07:00
xfs_inode_fork.h xfs: provide a centralized method for verifying inline fork data 2018-01-08 10:54:47 -08:00
xfs_log_format.h xfs: fix type usage 2017-11-16 12:06:45 -08:00
xfs_log_recover.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_log_rlimit.c xfs: trace log reservations at mount time 2018-01-08 10:54:47 -08:00
xfs_quota_defs.h xfs: add full xfs_dqblk verifier 2018-05-09 10:04:01 -07:00
xfs_refcount_btree.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_refcount_btree.h xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_refcount.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_refcount.h xfs: add scrub cross-referencing helpers for the refcount btrees 2018-01-17 21:00:44 -08:00
xfs_rmap_btree.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_rmap_btree.h xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_rmap.c xfs: add missing rmap error return 2018-05-10 08:56:41 -07:00
xfs_rmap.h xfs: add scrub cross-referencing helpers for the rmap btrees 2018-01-17 21:00:44 -08:00
xfs_rtbitmap.c xfs: cross-reference the realtime bitmap 2018-01-17 21:00:46 -08:00
xfs_sb.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_sb.h xfs: refactor the geometry structure filling function 2018-01-08 10:54:48 -08:00
xfs_shared.h xfs: get rid of the log item descriptor 2018-05-10 08:56:46 -07:00
xfs_symlink_remote.c Split buffer's b_fspriv field 2018-01-29 07:27:22 -08:00
xfs_trans_resv.c xfs: non-scrub - remove unused function parameters 2018-04-09 10:23:42 -07:00
xfs_trans_resv.h xfs: increase log reservations for reflink 2016-10-05 16:26:29 -07:00
xfs_trans_space.h xfs: reserve enough blocks to handle btree splits when remapping 2017-05-03 13:21:40 -07:00
xfs_types.h xfs: move xfs_bmbt_irec and xfs_exntst_t to xfs_types.h 2017-11-06 11:53:41 -08:00