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xfs: cap the block count of xfs_iomap_write_direct() at one extent

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xfs_iomap_write_direct() reserves blocks for the whole count in an
unsigned int. For a pNFS layout the client chooses that count, and an
RW LAYOUTGET for 16 TiB wraps the reservation and shuts XFS down.

xfs_bmapi_write() maps at most XFS_MAX_BMBT_EXTLEN blocks here, so cap
the count at that. nfsd asks again for the rest. The other callers get
the same mapping as before.

Suggested-by: Darrick J. Wong <djwong@kernel.org>
Suggested-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Pankaj Raghav <p.raghav@samsung.com>
Fixes: 527851124d ("xfs: implement pNFS export operations")
Cc: stable@vger.kernel.org
Signed-off-by: Daejun Park <daejun7.park@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Daejun Park 2026-10-29 11:23:02 +09:00 committed by Carlos Maiolino
parent d8c2bc8846
commit 66d1ce09eb
1 changed files with 8 additions and 0 deletions
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8
fs/xfs/xfs_iomap.c
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@ -285,6 +285,14 @@ xfs_iomap_write_direct(
ASSERT(count_fsb > 0);
/*
* xfs_bmapi_write() maps at most XFS_MAX_BMBT_EXTLEN blocks in one
* mapping, so don't reserve blocks for more. A pNFS layout range
* comes from a client, and its block count may not even fit the
* 32-bit reservation. The caller maps the rest with a later call.
*/
count_fsb = min_t(xfs_filblks_t, count_fsb, XFS_MAX_BMBT_EXTLEN);
resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb,
xfs_get_extsz_hint(ip));
if (unlikely(XFS_IS_REALTIME_INODE(ip))) {