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authorChristoph Hellwig <hch@lst.de>2023-10-11 08:16:26 +0300
committerChandan Babu R <chandanbabu@kernel.org>2023-10-23 08:36:54 +0300
commit35dc55b9e80cb9ec4bcb969302000b002b2ed850 (patch)
treeb6494e0ecbcdd14cf6874311a6830fcc20e306e3 /fs/xfs
parent2b99e410b28f5a75ae417e6389e767c7745d6fce (diff)
downloadlinux-35dc55b9e80cb9ec4bcb969302000b002b2ed850.tar.xz
xfs: handle nimaps=0 from xfs_bmapi_write in xfs_alloc_file_space
If xfs_bmapi_write finds a delalloc extent at the requested range, it tries to convert the entire delalloc extent to a real allocation. But if the allocator cannot find a single free extent large enough to cover the start block of the requested range, xfs_bmapi_write will return 0 but leave *nimaps set to 0. In that case we simply need to keep looping with the same startoffset_fsb so that one of the following allocations will eventually reach the requested range. Note that this could affect any caller of xfs_bmapi_write that covers an existing delayed allocation. As far as I can tell we do not have any other such caller, though - the regular writeback path uses xfs_bmapi_convert_delalloc to convert delayed allocations to real ones, and direct I/O invalidates the page cache first. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_bmap_util.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index c640dfc2d00f..93829d86751d 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -774,12 +774,10 @@ xfs_alloc_file_space(
{
xfs_mount_t *mp = ip->i_mount;
xfs_off_t count;
- xfs_filblks_t allocated_fsb;
xfs_filblks_t allocatesize_fsb;
xfs_extlen_t extsz, temp;
xfs_fileoff_t startoffset_fsb;
xfs_fileoff_t endoffset_fsb;
- int nimaps;
int rt;
xfs_trans_t *tp;
xfs_bmbt_irec_t imaps[1], *imapp;
@@ -802,7 +800,6 @@ xfs_alloc_file_space(
count = len;
imapp = &imaps[0];
- nimaps = 1;
startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
endoffset_fsb = XFS_B_TO_FSB(mp, offset + count);
allocatesize_fsb = endoffset_fsb - startoffset_fsb;
@@ -813,6 +810,7 @@ xfs_alloc_file_space(
while (allocatesize_fsb && !error) {
xfs_fileoff_t s, e;
unsigned int dblocks, rblocks, resblks;
+ int nimaps = 1;
/*
* Determine space reservations for data/realtime.
@@ -878,15 +876,19 @@ xfs_alloc_file_space(
if (error)
break;
- allocated_fsb = imapp->br_blockcount;
-
- if (nimaps == 0) {
- error = -ENOSPC;
- break;
+ /*
+ * If the allocator cannot find a single free extent large
+ * enough to cover the start block of the requested range,
+ * xfs_bmapi_write will return 0 but leave *nimaps set to 0.
+ *
+ * In that case we simply need to keep looping with the same
+ * startoffset_fsb so that one of the following allocations
+ * will eventually reach the requested range.
+ */
+ if (nimaps) {
+ startoffset_fsb += imapp->br_blockcount;
+ allocatesize_fsb -= imapp->br_blockcount;
}
-
- startoffset_fsb += allocated_fsb;
- allocatesize_fsb -= allocated_fsb;
}
return error;