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| author | Dave Chinner <david@fromorbit.com> | 2022-04-21 16:46:17 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2022-04-21 16:46:17 +1000 |
| commit | a44a027a8b2a20fec30e0e9c99b0eb41c03e7420 (patch) | |
| tree | 2cce770cced23924fd30b40601b52ffb609baab5 /fs/xfs/libxfs/xfs_da_btree.h | |
| parent | 463260d7670566c357dfa2c38bc3124c98b646bc (diff) | |
| parent | 973ac0eb3a7dfedecd385bd2b48b12e62a0492f2 (diff) | |
| download | linux-a44a027a8b2a20fec30e0e9c99b0eb41c03e7420.tar.gz linux-a44a027a8b2a20fec30e0e9c99b0eb41c03e7420.tar.bz2 linux-a44a027a8b2a20fec30e0e9c99b0eb41c03e7420.zip | |
Merge tag 'large-extent-counters-v9' of https://github.com/chandanr/linux into xfs-5.19-for-next
xfs: Large extent counters
The commit xfs: fix inode fork extent count overflow
(3f8a4f1d876d3e3e49e50b0396eaffcc4ba71b08) mentions that 10 billion
data fork extents should be possible to create. However the
corresponding on-disk field has a signed 32-bit type. Hence this
patchset extends the per-inode data fork extent counter to 64 bits
(out of which 48 bits are used to store the extent count).
Also, XFS has an attribute fork extent counter which is 16 bits
wide. A workload that,
1. Creates 1 million 255-byte sized xattrs,
2. Deletes 50% of these xattrs in an alternating manner,
3. Tries to insert 400,000 new 255-byte sized xattrs
causes the xattr extent counter to overflow.
Dave tells me that there are instances where a single file has more
than 100 million hardlinks. With parent pointers being stored in
xattrs, we will overflow the signed 16-bits wide attribute extent
counter when large number of hardlinks are created. Hence this
patchset extends the on-disk field to 32-bits.
The following changes are made to accomplish this,
1. A 64-bit inode field is carved out of existing di_pad and
di_flushiter fields to hold the 64-bit data fork extent counter.
2. The existing 32-bit inode data fork extent counter will be used to
hold the attribute fork extent counter.
3. A new incompat superblock flag to prevent older kernels from mounting
the filesystem.
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_da_btree.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_da_btree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_da_btree.h b/fs/xfs/libxfs/xfs_da_btree.h index 7b0f986e5cb5..deb368d041e3 100644 --- a/fs/xfs/libxfs/xfs_da_btree.h +++ b/fs/xfs/libxfs/xfs_da_btree.h @@ -30,6 +30,7 @@ struct xfs_da_geometry { unsigned int free_hdr_size; /* dir2 free header size */ unsigned int free_max_bests; /* # of bests entries in dir2 free */ xfs_dablk_t freeblk; /* blockno of free data v2 */ + xfs_extnum_t max_extents; /* Max. extents in corresponding fork */ xfs_dir2_data_aoff_t data_first_offset; size_t data_entry_offset; |