kernel/linux.git/fs/xfs, branch v6.18.44

xfs: don't replace the wrong part of the cow fork

2026-08-03T09:22:08+00:00

[ Upstream commit a1caeeadbf57ff86dfc3454398c46de86056a74e ] LOLLM points out that xfs_iext_lookup_extent can return a @got where got->br_startoff < startoff. In this case, xrep_cow_replace_range replaces the entire mapping instead of just the part that had been marked bad in the bitmap, but advances the bitmap cursor in xrep_cow_replace by the amount replaced. As a result, we fail to replace the end of the bad range, and replace part of the good range. Fix this by rewriting the replace method to handle replacing the middle of a cow fork mapping. This we do by returning both the current mapping as @got, and the subset of the mapping that we want to replace as @rep, using @rep to store the results of the new allocation, and comparing @rep to @got to figure out the exact transformations needed. Cc: stable@vger.kernel.org # v6.8 Fixes: dbbdbd0086320a ("xfs: repair problems in CoW forks") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

xfs: use bio_reuse in the zone GC code

2026-07-24T14:17:24+00:00

[ Upstream commit 0506d32f7c52e41f6e8db7c337e0ce6374c6ffbb ] Replace our somewhat fragile code to reuse the bio, which caused a regression in the past with the block layer bio_reuse helper. Signed-off-by: Christoph Hellwig Reviewed-by: Hans Holmberg Reviewed-by: Carlos Maiolino Reviewed-by: Damien Le Moal Signed-off-by: Carlos Maiolino [ sashal: open-coded the bio_reuse logic at the call site as 6.18 lacks commit 7ca44303f9f6 ("block: add a bio_reuse helper") ] Stable-dep-of: ae3692c7f440 ("xfs: add newly added RTGs to the free pool in growfs") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

xfs: only log freed extents for the current RTG in zoned growfs

2026-07-24T14:17:24+00:00

[ Upstream commit 44cccefe65749821d9a13523c8b763bf1262ef73 ] Otherwise a power fail or crash during growfs could lead to an elevated sb_rblocks counter. Note that the step function is much simpler compared to the classic RT allocator as zoned RT sections must be aligned to real time group boundaries. Fixes: 01b71e64bb87 ("xfs: support growfs on zoned file systems") Cc: # v6.15 Signed-off-by: Christoph Hellwig Reviewed-by: "Darrick J. Wong" Reviewed-by: Damien Le Moal Signed-off-by: Carlos Maiolino Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

xfs: add a xfs_groups_to_rfsbs helper

2026-07-24T14:17:23+00:00

[ Upstream commit 0ec73eb3f12350799c4b3fb764225f6e38b42d1e ] Plus a rtgroup wrapper and use that to avoid overflows when converting zone/rtg counts to block counts. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Carlos Maiolino Stable-dep-of: 44cccefe6574 ("xfs: only log freed extents for the current RTG in zoned growfs") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

xfs: initialize iomap->flags earlier in xfs_bmbt_to_iomap

2026-07-24T14:17:23+00:00

[ Upstream commit 327e58826eb72f8bae9419cf1a4e722b57c85694 ] Otherwise we lose the IOMAP_IOEND_BOUNDARY assingment for writes to the first block in a realtime group, and could cause incorrect merges for such writes. Fixes: b91afef72471 ("xfs: don't merge ioends across RTGs") Cc: # v6.13 Signed-off-by: Christoph Hellwig Reviewed-by: "Darrick J. Wong" Signed-off-by: Carlos Maiolino Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

xfs: use rtrefcount btree cursor in xchk_xref_is_rt_cow_staging

2026-07-18T14:53:37+00:00

commit ee248157da501f0c02688fb64e5359f2832b0b01 upstream. LOLLM points out that we pass the wrong btree cursor here. We want the rtrefcount btree cursor, not the non-rt one. This is fairly benign since it only affects tracing data. Cc: stable@vger.kernel.org # v6.14 Fixes: 91683bb3f264c0 ("xfs: cross-reference checks with the rt refcount btree") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Greg Kroah-Hartman

xfs: write the rg superblock when fixing it

2026-07-18T14:53:37+00:00

commit 9af789fa274bc14b907f811f79fa988a6fc6d4e7 upstream. The rtgroup superblock fixer should write the rtgroup superblock. LOLLM noticed this, oops. :/ Cc: stable@vger.kernel.org # v6.13 Fixes: 1433f8f9cead37 ("xfs: repair realtime group superblock") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Greg Kroah-Hartman

xfs: fix off-by-one error when calling xchk_xref_has_rt_owner

2026-07-18T14:53:37+00:00

commit 5d72a68f2007ba2a968d6bf47dba3f4620bd182e upstream. LOLLM noticed an off-by-one error when computing the length of the rtrmap to cross-check. Cc: stable@vger.kernel.org # v6.14 Fixes: 037a44d8277adf ("xfs: cross-reference the realtime rmapbt") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Greg Kroah-Hartman

xfs: don't zap bmbt forks if they are MAXLEVELS tall

2026-07-18T14:53:37+00:00

commit 59c462b0f5cfa107794228051724b34ae9334168 upstream. LOLLM noticed a discrepancy between the bmbt level checks in the libxfs bmbt code vs. the inode repair code. We do actually allow a bmbt root that proclaims to have a height of XFS_BM_MAXLEVELS. Cc: stable@vger.kernel.org # v6.8 Fixes: e744cef2060559 ("xfs: zap broken inode forks") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Greg Kroah-Hartman

xfs: fully check the parent handle when it points to the rootdir

2026-07-18T14:53:37+00:00

commit ba150ce63453ccd74bae1404c1dfedbd01ecfd55 upstream. LOLLM noticed that the directory tree path checking declares the path to be ok if the inumber in the parent pointer reaches the root directory. Unfortunately, it neglects to check that the generation is correct. Fix that by moving the generation check up. Cc: stable@vger.kernel.org # v6.10 Fixes: 928b721a11789a ("xfs: teach online scrub to find directory tree structure problems") Signed-off-by: "Darrick J. Wong" Assisted-by: LOLLM # finding obvious bugs Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino Signed-off-by: Greg Kroah-Hartman