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xfs: specify AG in bulk req

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Add a new xfs_bulk_ireq flag to constrain the iteration to a single AG.
If the passed-in startino value is zero then we start with the first
inode in the AG that the user passes in; otherwise, we iterate only
within the same AG as the passed-in inode.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-07-03 20:36:28 -07:00
parent fba9760a43
commit 13d59a2a61
7 changed files with 69 additions and 12 deletions
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24
fs/xfs/xfs_ioctl.c
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@ -844,7 +844,6 @@ xfs_bulk_ireq_setup(
{
if (hdr->icount == 0 ||
(hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) ||
hdr->reserved32 ||
memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
return -EINVAL;
@ -852,6 +851,29 @@ xfs_bulk_ireq_setup(
breq->ubuffer = ubuffer;
breq->icount = hdr->icount;
breq->ocount = 0;
breq->flags = 0;
/*
* The IREQ_AGNO flag means that we only want results from a given AG.
* If @hdr->ino is zero, we start iterating in that AG. If @hdr->ino is
* beyond the specified AG then we return no results.
*/
if (hdr->flags & XFS_BULK_IREQ_AGNO) {
if (hdr->agno >= mp->m_sb.sb_agcount)
return -EINVAL;
if (breq->startino == 0)
breq->startino = XFS_AGINO_TO_INO(mp, hdr->agno, 0);
else if (XFS_INO_TO_AGNO(mp, breq->startino) < hdr->agno)
return -EINVAL;
breq->flags |= XFS_IBULK_SAME_AG;
/* Asking for an inode past the end of the AG? We're done! */
if (XFS_INO_TO_AGNO(mp, breq->startino) > hdr->agno)
return XFS_ITER_ABORT;
} else if (hdr->agno)
return -EINVAL;
/* Asking for an inode past the end of the FS? We're done! */
if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)