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linux/fs/xfs/libxfs
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Darrick J. Wong 00fd1d56dd xfs: redesign the reflink remap loop to fix blkres depletion crash 
The existing reflink remapping loop has some structural problems that
need addressing:

The biggest problem is that we create one transaction for each extent in
the source file without accounting for the number of mappings there are
for the same range in the destination file.  In other words, we don't
know the number of remap operations that will be necessary and we
therefore cannot guess the block reservation required.  On highly
fragmented filesystems (e.g. ones with active dedupe) we guess wrong,
run out of block reservation, and fail.

The second problem is that we don't actually use the bmap intents to
their full potential -- instead of calling bunmapi directly and having
to deal with its backwards operation, we could call the deferred ops
xfs_bmap_unmap_extent and xfs_refcount_decrease_extent instead.  This
makes the frontend loop much simpler.

Solve all of these problems by refactoring the remapping loops so that
we only perform one remapping operation per transaction, and each
operation only tries to remap a single extent from source to dest.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reported-by: Edwin Török <edwin@etorok.net>
Tested-by: Edwin Török <edwin@etorok.net>
2020-07-06 10:46:57 -07:00
..
xfs_ag_resv.c xfs: fix missing header includes 2019-11-07 13:00:53 -08:00
xfs_ag_resv.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_ag.c xfs: remove XFS_BUF_TO_SBP 2020-03-11 09:11:39 -07:00
xfs_ag.h xfs: add a new ioctl to describe allocation group geometry 2019-04-14 18:15:57 -07:00
xfs_alloc_btree.c xfs: add support for free space btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_alloc_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_alloc.c xfs: fix incorrect test in xfs_alloc_ag_vextent_lastblock 2020-03-17 07:32:46 -07:00
xfs_alloc.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_leaf.c xfs: more lockdep whackamole with kmem_alloc* 2020-05-27 08:49:28 -07:00
xfs_attr_leaf.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_remote.c xfs: remove ATTR_KERNOVAL 2020-03-02 20:55:53 -08:00
xfs_attr_remote.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_sf.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_attr.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bit.c xfs: fix missing header includes 2019-11-07 13:00:53 -08:00
xfs_bit.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bmap_btree.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_bmap_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bmap.c xfs: force writes to delalloc regions to unwritten 2020-05-27 08:49:28 -07:00
xfs_bmap.h xfs: redesign the reflink remap loop to fix blkres depletion crash 2020-07-06 10:46:57 -07:00
xfs_btree_staging.c xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_btree_staging.h xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_btree.c xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_cksum.h
xfs_da_btree.c xfs: xfs_dabuf_map should return ENOMEM when map allocation fails 2020-03-15 09:22:35 -07:00
xfs_da_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_da_format.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_defer.c xfs: use ordered buffers to initialize dquot buffers during quotacheck 2020-05-19 09:40:56 -07:00
xfs_defer.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dir2_block.c xfs: move the per-fork nextents fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dir2_data.c xfs: check owner of dir3 data blocks 2020-03-12 07:58:12 -07:00
xfs_dir2_leaf.c xfs: add a function to deal with corrupt buffers post-verifiers 2020-03-12 07:58:12 -07:00
xfs_dir2_node.c xfs: check owner of dir3 free blocks 2020-03-12 07:58:12 -07:00
xfs_dir2_priv.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dir2_sf.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dir2.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dir2.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dquot_buf.c xfs: remove the xfs_disk_dquot_t and xfs_dquot_t 2019-11-13 11:13:45 -08:00
xfs_errortag.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_format.h xfs: remove the XFS_DFORK_Q macro 2020-05-19 09:40:58 -07:00
xfs_fs.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_health.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_ialloc_btree.c xfs: add support for inode btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_ialloc_btree.h xfs: add support for inode btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_ialloc.c xfs: only check the superblock version for dinode size calculation 2020-03-19 08:48:47 -07:00
xfs_ialloc.h xfs: don't commit sunit/swidth updates to disk if that would cause repair failures 2019-12-19 07:53:48 -08:00
xfs_iext_tree.c xfs: fix inode fork extent count overflow 2019-10-21 09:04:58 -07:00
xfs_inode_buf.c xfs: Couple of typo fixes in comments 2020-07-06 10:46:56 -07:00
xfs_inode_buf.h xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_inode_fork.c xfs: cleanup xfs_idestroy_fork 2020-05-19 09:40:59 -07:00
xfs_inode_fork.h xfs: cleanup xfs_idestroy_fork 2020-05-19 09:40:59 -07:00
xfs_log_format.h xfs: only check the superblock version for dinode size calculation 2020-03-19 08:48:47 -07:00
xfs_log_recover.h xfs: move log recovery buffer cancellation code to xfs_buf_item_recover.c 2020-05-08 08:50:01 -07:00
xfs_log_rlimit.c xfs: remove unused header files 2019-06-28 19:30:43 -07:00
xfs_quota_defs.h xfs: always return -ENOSPC on project quota reservation failure 2020-05-27 08:49:25 -07:00
xfs_refcount_btree.c xfs: add support for refcount btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_refcount_btree.h xfs: add support for refcount btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_refcount.c xfs: make the btree ag cursor private union anonymous 2020-03-13 10:37:15 -07:00
xfs_refcount.h xfs: remove unnecessary int returns from deferred refcount functions 2019-08-28 08:31:02 -07:00
xfs_rmap_btree.c xfs: add support for rmap btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_rmap_btree.h xfs: add support for rmap btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_rmap.c xfs: convert btree cursor ag-private member name 2020-03-13 10:37:14 -07:00
xfs_rmap.h xfs: reinitialize rm_flags when unpacking an offset into an rmap irec 2019-08-28 08:31:02 -07:00
xfs_rtbitmap.c xfs: rename xfs_bmap_is_real_extent to is_written_extent 2020-07-06 10:46:57 -07:00
xfs_sb.c xfs: fix the warning message in xfs_validate_sb_common() 2020-05-19 09:40:56 -07:00
xfs_sb.h xfs: change some error-less functions to void types 2019-05-01 20:26:30 -07:00
xfs_shared.h xfs: preserve rmapbt swapext block reservation from freed blocks 2020-07-06 10:46:56 -07:00
xfs_symlink_remote.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_trans_inode.c xfs: remove the xfs_inode_log_item_t typedef 2020-05-04 09:03:16 -07:00
xfs_trans_resv.c xfs: add a new xfs_sb_version_has_v3inode helper 2020-03-19 08:47:34 -07:00
xfs_trans_resv.h
xfs_trans_space.h xfs: separate inode geometry 2019-06-12 08:37:40 -07:00
xfs_types.c xfs: remove unused header files 2019-06-28 19:30:43 -07:00
xfs_types.h xfs: remove unused structure members & simple typedefs 2019-11-13 18:22:41 -08:00