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xfs: alert the user about data/attr fork mappings that could be merged

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If the data or attr forks have mappings that could be merged, let the
user know that the structure could be optimized.  This isn't a
filesystem corruption since the regular filesystem does not try to be
smart about merging bmbt records.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:25 -07:00
parent c0d5a92f7a
commit 336642f792
1 changed files with 11 additions and 0 deletions
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11
fs/xfs/scrub/bmap.c
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@ -764,6 +764,7 @@ xchk_bmap_iext_iter(
{
struct xfs_bmbt_irec got;
struct xfs_ifork *ifp;
xfs_filblks_t prev_len;
ifp = xfs_ifork_ptr(info->sc->ip, info->whichfork);
@ -782,6 +783,7 @@ xchk_bmap_iext_iter(
* Iterate subsequent iextent records and merge them with the one
* that we just read, if possible.
*/
prev_len = irec->br_blockcount;
while (xfs_iext_peek_next_extent(ifp, &info->icur, &got)) {
if (!xchk_are_bmaps_contiguous(irec, &got))
break;
@ -792,7 +794,16 @@ xchk_bmap_iext_iter(
return false;
}
/*
* Notify the user of mergeable records in the data or attr
* forks. CoW forks only exist in memory so we ignore them.
*/
if (info->whichfork != XFS_COW_FORK &&
prev_len + got.br_blockcount > BMBT_BLOCKCOUNT_MASK)
xchk_ino_set_preen(info->sc, info->sc->ip->i_ino);
irec->br_blockcount += got.br_blockcount;
prev_len = got.br_blockcount;
xfs_iext_next(ifp, &info->icur);
}