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Zhang Yi 4c99f3026c xfs: convert delayed extents to unwritten when zeroing post eof blocks 
commit 5ce5674187c345dc31534d2024c09ad8ef29b7ba upstream.

Current clone operation could be non-atomic if the destination of a file
is beyond EOF, user could get a file with corrupted (zeroed) data on
crash.

The problem is about preallocations. If you write some data into a file:

	[A...B)

and XFS decides to preallocate some post-eof blocks, then it can create
a delayed allocation reservation:

	[A.........D)

The writeback path tries to convert delayed extents to real ones by
allocating blocks. If there aren't enough contiguous free space, we can
end up with two extents, the first real and the second still delalloc:

	[A....C)[C.D)

After that, both the in-memory and the on-disk file sizes are still B.
If we clone into the range [E...F) from another file:

	[A....C)[C.D)      [E...F)

then xfs_reflink_zero_posteof() calls iomap_zero_range() to zero out the
range [B, E) beyond EOF and flush it. Since [C, D) is still a delalloc
extent, its pagecache will be zeroed and both the in-memory and on-disk
size will be updated to D after flushing but before cloning. This is
wrong, because the user can see the size change and read the zeroes
while the clone operation is ongoing.

We need to keep the in-memory and on-disk size before the clone
operation starts, so instead of writing zeroes through the page cache
for delayed ranges beyond EOF, we convert these ranges to unwritten and
invalidate any cached data over that range beyond EOF.

Suggested-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-10-22 15:46:24 +02:00
..
libxfs xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset 2024-10-22 15:46:23 +02:00
scrub xfs: use dontcache for grabbing inodes during scrub 2024-10-22 15:46:23 +02:00
Kconfig xfs: fix again select in kconfig XFS_ONLINE_SCRUB_STATS 2024-02-16 19:10:45 +01:00
Makefile xfs: move the realtime summary file scrubber to a separate source file 2023-08-10 07:48:09 -07:00
kmem.c
…
kmem.h
…
mrlock.h
…
xfs.h
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xfs_acl.c xfs: convert to ctime accessor functions 2023-07-24 10:30:06 +02:00
xfs_acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
xfs_aops.c xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset 2024-10-22 15:46:23 +02:00
xfs_aops.h
…
xfs_attr_inactive.c xfs: make inode unlinked bucket recovery work with quotacheck 2023-09-12 10:31:07 -07:00
xfs_attr_item.c xfs: enforce one namespace per attribute 2024-10-22 15:46:23 +02:00
xfs_attr_item.h
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xfs_attr_list.c xfs: enforce one namespace per attribute 2024-10-22 15:46:23 +02:00
xfs_bio_io.c fs/xfs: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:33 -06:00
xfs_bmap_item.c xfs: transfer recovered intent item ownership in ->iop_recover 2024-04-03 15:28:47 +02:00
xfs_bmap_item.h
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xfs_bmap_util.c xfs: fix error returns from xfs_bmapi_write 2024-10-22 15:46:21 +02:00
xfs_bmap_util.h xfs: xfs_bmap_punch_delalloc_range() should take a byte range 2022-11-29 09:09:17 +11:00
xfs_buf.c xfs: force all buffers to be written during btree bulk load 2024-04-03 15:28:48 +02:00
xfs_buf.h xfs: force all buffers to be written during btree bulk load 2024-04-03 15:28:48 +02:00
xfs_buf_item.c xfs: buffer pins need to hold a buffer reference 2023-06-05 04:05:27 +10:00
xfs_buf_item.h
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xfs_buf_item_recover.c xfs: verify buffer contents when we skip log replay 2023-04-12 15:49:23 +10:00
xfs_dahash_test.c xfs: test the ascii case-insensitive hash 2023-04-11 19:05:05 -07:00
xfs_dahash_test.h xfs: test dir/attr hash when loading module 2023-03-19 09:55:49 -07:00
xfs_dir2_readdir.c xfs: rearrange the logic and remove the broken comment for xfs_dir2_isxx 2022-10-04 16:39:58 +11:00
xfs_discard.c xfs: abort fstrim if kernel is suspending 2023-10-04 09:25:04 +11:00
xfs_discard.h xfs: move log discard work to xfs_discard.c 2023-10-04 09:24:02 +11:00
xfs_dquot.c xfs: fix error returns from xfs_bmapi_write 2024-10-22 15:46:21 +02:00
xfs_dquot.h
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xfs_dquot_item.c
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xfs_dquot_item.h
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xfs_dquot_item_recover.c xfs: dquot recovery does not validate the recovered dquot 2024-02-16 19:10:46 +01:00
xfs_drain.c xfs: minimize overhead of drain wakeups by using jump labels 2023-04-11 18:59:59 -07:00
xfs_drain.h xfs: minimize overhead of drain wakeups by using jump labels 2023-04-11 18:59:59 -07:00
xfs_error.c xfs: make kobj_type structures constant 2023-02-10 08:59:48 -08:00
xfs_error.h xfs: allow setting full range of panic tags 2023-02-09 18:36:17 -08:00
xfs_export.c xfs: fix reloading entire unlinked bucket lists 2023-09-24 18:12:13 -07:00
xfs_export.h
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xfs_extent_busy.c xfs: process free extents to busy list in FIFO order 2023-10-11 12:35:21 -07:00
xfs_extent_busy.h xfs: reduce AGF hold times during fstrim operations 2023-10-04 09:24:52 +11:00
xfs_extfree_item.c xfs: transfer recovered intent item ownership in ->iop_recover 2024-04-03 15:28:47 +02:00
xfs_extfree_item.h xfs: refactor all the EFI/EFD log item sizeof logic 2022-10-31 08:58:20 -07:00
xfs_file.c xfs: allow read IO and FICLONE to run concurrently 2024-02-16 19:10:45 +01:00
xfs_filestream.c xfs: fix double xfs_perag_rele() in xfs_filestream_pick_ag() 2023-06-05 14:48:15 +10:00
xfs_filestream.h xfs: pass perag to filestreams tracing 2023-02-13 09:14:56 +11:00
xfs_fsmap.c xfs: move the xfs_rtbitmap.c declarations to xfs_rtbitmap.h 2024-04-03 15:28:46 +02:00
xfs_fsmap.h
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xfs_fsops.c xfs: fix perag leak when growfs fails 2024-04-03 15:28:48 +02:00
xfs_fsops.h
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xfs_globals.c xfs: allow setting full range of panic tags 2023-02-09 18:36:17 -08:00
xfs_health.c
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xfs_icache.c xfs: don't use current->journal_info 2024-06-21 14:38:45 +02:00
xfs_icache.h xfs: use per-mount cpumask to track nonempty percpu inodegc lists 2023-09-11 08:39:03 -07:00
xfs_icreate_item.c
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xfs_icreate_item.h
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xfs_inode.c xfs: allow cross-linking special files without project quota 2024-06-21 14:38:45 +02:00
xfs_inode.h xfs: respect the stable writes flag on the RT device 2024-02-16 19:10:46 +01:00
xfs_inode_item.c xfs: initialise di_crc in xfs_log_dinode 2024-04-03 15:28:48 +02:00
xfs_inode_item.h xfs: fix AGF vs inode cluster buffer deadlock 2023-06-05 04:08:27 +10:00
xfs_inode_item_recover.c xfs: inode recovery does not validate the recovered inode 2024-02-16 19:10:45 +01:00
xfs_ioctl.c xfs: respect the stable writes flag on the RT device 2024-02-16 19:10:46 +01:00
xfs_ioctl.h fs: port ->fileattr_set() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
xfs_ioctl32.c fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap 2023-01-19 09:24:29 +01:00
xfs_ioctl32.h
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xfs_iomap.c xfs: convert delayed extents to unwritten when zeroing post eof blocks 2024-10-22 15:46:24 +02:00
xfs_iomap.h xfs: use iomap_valid method to detect stale cached iomaps 2022-11-29 09:09:17 +11:00
xfs_iops.c xfs: respect the stable writes flag on the RT device 2024-02-16 19:10:46 +01:00
xfs_iops.h fs: port ->setattr() to pass mnt_idmap 2023-01-19 09:24:02 +01:00
xfs_itable.c xfs: fix reloading entire unlinked bucket lists 2023-09-24 18:12:13 -07:00
xfs_itable.h fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap 2023-01-19 09:24:29 +01:00
xfs_iunlink_item.c xfs: create traced helper to get extra perag references 2023-04-11 18:59:55 -07:00
xfs_iunlink_item.h xfs: add in-memory iunlink log item 2022-07-14 11:47:42 +10:00
xfs_iwalk.c xfs: create traced helper to get extra perag references 2023-04-11 18:59:55 -07:00
xfs_iwalk.h
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xfs_linux.h xfs: create scaffolding for creating debugfs entries 2023-08-10 07:48:07 -07:00
xfs_log.c xfs: use xfs_defer_pending objects to recover intent items 2024-04-03 15:28:46 +02:00
xfs_log.h xfs: move CIL ordering to the logvec chain 2022-07-07 18:56:08 +10:00
xfs_log_cil.c xfs: move log discard work to xfs_discard.c 2023-10-04 09:24:02 +11:00
xfs_log_priv.h xfs: use xfs_defer_pending objects to recover intent items 2024-04-03 15:28:46 +02:00
xfs_log_recover.c xfs: fix log recovery buffer allocation for the legacy h_size fixup 2024-08-14 13:59:03 +02:00
xfs_message.c
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xfs_message.h
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xfs_mount.c xfs: track usage statistics of online fsck 2023-08-10 07:48:07 -07:00
xfs_mount.h xfs: make inode unlinked bucket recovery work with quotacheck 2023-09-12 10:31:07 -07:00
xfs_mru_cache.c
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xfs_mru_cache.h
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xfs_notify_failure.c xfs: correct calculation for agend and blockcount 2023-10-12 10:11:56 +05:30
xfs_ondisk.h xfs: convert flex-array declarations in xfs attr shortform objects 2023-07-17 08:48:56 -07:00
xfs_pnfs.c fs: port ->setattr() to pass mnt_idmap 2023-01-19 09:24:02 +01:00
xfs_pnfs.h
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xfs_pwork.c
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xfs_pwork.h
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xfs_qm.c xfs: fix reloading entire unlinked bucket lists 2023-09-24 18:12:13 -07:00
xfs_qm.h
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xfs_qm_bhv.c
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xfs_qm_syscalls.c
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xfs_quota.h
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xfs_quotaops.c
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xfs_refcount_item.c xfs: transfer recovered intent item ownership in ->iop_recover 2024-04-03 15:28:47 +02:00
xfs_refcount_item.h
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xfs_reflink.c xfs: remove a racy if_bytes check in xfs_reflink_end_cow_extent 2024-10-22 15:46:22 +02:00
xfs_reflink.h xfs: pass perag to xfs_alloc_read_agf() 2022-07-07 19:07:40 +10:00
xfs_rmap_item.c xfs: transfer recovered intent item ownership in ->iop_recover 2024-04-03 15:28:47 +02:00
xfs_rmap_item.h
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xfs_rtalloc.c xfs: fix error returns from xfs_bmapi_write 2024-10-22 15:46:21 +02:00
xfs_rtalloc.h xfs: move the xfs_rtbitmap.c declarations to xfs_rtbitmap.h 2024-04-03 15:28:46 +02:00
xfs_stats.c xfs: replace unnecessary seq_printf with seq_puts 2022-09-19 06:48:14 +10:00
xfs_stats.h
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xfs_super.c xfs: read only mounts with fsopen mount API are busted 2024-01-31 16:19:07 -08:00
xfs_super.h xfs: create scaffolding for creating debugfs entries 2023-08-10 07:48:07 -07:00
xfs_symlink.c fs: port fs{g,u}id helpers to mnt_idmap 2023-01-19 09:24:30 +01:00
xfs_symlink.h fs: port inode_init_owner() to mnt_idmap 2023-01-19 09:24:28 +01:00
xfs_sysctl.c xfs: simplify two-level sysctl registration for xfs_table 2023-04-13 11:49:35 -07:00
xfs_sysctl.h
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xfs_sysfs.c xfs: make kobj_type structures constant 2023-02-10 08:59:48 -08:00
xfs_sysfs.h xfs: make kobj_type structures constant 2023-02-10 08:59:48 -08:00
xfs_trace.c xfs: add debug knob to slow down writeback for fun 2022-11-28 17:24:35 -08:00
xfs_trace.h xfs: load uncached unlinked inodes into memory on demand 2023-09-12 10:31:07 -07:00
xfs_trans.c xfs: collect errors from inodegc for unlinked inode recovery 2023-06-05 14:48:15 +10:00
xfs_trans.h xfs: don't use current->journal_info 2024-06-21 14:38:45 +02:00
xfs_trans_ail.c xfs: don't reverse order of items in bulk AIL insertion 2023-06-29 09:28:23 -07:00
xfs_trans_buf.c
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xfs_trans_dquot.c
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xfs_trans_priv.h xfs: convert log vector chain to use list heads 2022-07-07 18:55:59 +10:00
xfs_xattr.c xfs: require a relatively recent V5 filesystem for LARP mode 2023-09-12 10:31:08 -07:00
xfs_xattr.h
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