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xfs: convert trim to use for_each_perag_range

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To convert it to using active perag references and hence make it
shrink safe.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2023-02-13 09:14:54 +11:00
parent 3432ef6111
commit 35bf2b1abc
1 changed files with 23 additions and 27 deletions
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50
fs/xfs/xfs_discard.c
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@ -21,23 +21,20 @@
STATIC int
xfs_trim_extents(
struct xfs_mount *mp,
xfs_agnumber_t agno,
struct xfs_perag *pag,
xfs_daddr_t start,
xfs_daddr_t end,
xfs_daddr_t minlen,
uint64_t *blocks_trimmed)
{
struct xfs_mount *mp = pag->pag_mount;
struct block_device *bdev = mp->m_ddev_targp->bt_bdev;
struct xfs_btree_cur *cur;
struct xfs_buf *agbp;
struct xfs_agf *agf;
struct xfs_perag *pag;
int error;
int i;
pag = xfs_perag_get(mp, agno);
/*
* Force out the log. This means any transactions that might have freed
* space before we take the AGF buffer lock are now on disk, and the
@ -47,7 +44,7 @@ xfs_trim_extents(
error = xfs_alloc_read_agf(pag, NULL, 0, &agbp);
if (error)
goto out_put_perag;
return error;
agf = agbp->b_addr;
cur = xfs_allocbt_init_cursor(mp, NULL, agbp, pag, XFS_BTNUM_CNT);
@ -71,10 +68,10 @@ xfs_trim_extents(
error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
if (error)
goto out_del_cursor;
break;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto out_del_cursor;
break;
}
ASSERT(flen <= be32_to_cpu(agf->agf_longest));
@ -83,15 +80,15 @@ xfs_trim_extents(
* the format the range/len variables are supplied in by
* userspace.
*/
dbno = XFS_AGB_TO_DADDR(mp, agno, fbno);
dbno = XFS_AGB_TO_DADDR(mp, pag->pag_agno, fbno);
dlen = XFS_FSB_TO_BB(mp, flen);
/*
* Too small? Give up.
*/
if (dlen < minlen) {
trace_xfs_discard_toosmall(mp, agno, fbno, flen);
goto out_del_cursor;
trace_xfs_discard_toosmall(mp, pag->pag_agno, fbno, flen);
break;
}
/*
@ -100,7 +97,7 @@ xfs_trim_extents(
* down partially overlapping ranges for now.
*/
if (dbno + dlen < start || dbno > end) {
trace_xfs_discard_exclude(mp, agno, fbno, flen);
trace_xfs_discard_exclude(mp, pag->pag_agno, fbno, flen);
goto next_extent;
}
@ -109,32 +106,30 @@ xfs_trim_extents(
* discard and try again the next time.
*/
if (xfs_extent_busy_search(mp, pag, fbno, flen)) {
trace_xfs_discard_busy(mp, agno, fbno, flen);
trace_xfs_discard_busy(mp, pag->pag_agno, fbno, flen);
goto next_extent;
}
trace_xfs_discard_extent(mp, agno, fbno, flen);
trace_xfs_discard_extent(mp, pag->pag_agno, fbno, flen);
error = blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS);
if (error)
goto out_del_cursor;
break;
*blocks_trimmed += flen;
next_extent:
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto out_del_cursor;
break;
if (fatal_signal_pending(current)) {
error = -ERESTARTSYS;
goto out_del_cursor;
break;
}
}
out_del_cursor:
xfs_btree_del_cursor(cur, error);
xfs_buf_relse(agbp);
out_put_perag:
xfs_perag_put(pag);
return error;
}
@ -152,11 +147,12 @@ xfs_ioc_trim(
struct xfs_mount *mp,
struct fstrim_range __user *urange)
{
struct xfs_perag *pag;
unsigned int granularity =
bdev_discard_granularity(mp->m_ddev_targp->bt_bdev);
struct fstrim_range range;
xfs_daddr_t start, end, minlen;
xfs_agnumber_t start_agno, end_agno, agno;
xfs_agnumber_t agno;
uint64_t blocks_trimmed = 0;
int error, last_error = 0;
@ -193,18 +189,18 @@ xfs_ioc_trim(
end = start + BTOBBT(range.len) - 1;
if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;
end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1;
start_agno = xfs_daddr_to_agno(mp, start);
end_agno = xfs_daddr_to_agno(mp, end);
for (agno = start_agno; agno <= end_agno; agno++) {
error = xfs_trim_extents(mp, agno, start, end, minlen,
agno = xfs_daddr_to_agno(mp, start);
for_each_perag_range(mp, agno, xfs_daddr_to_agno(mp, end), pag) {
error = xfs_trim_extents(pag, start, end, minlen,
&blocks_trimmed);
if (error) {
last_error = error;
if (error == -ERESTARTSYS)
if (error == -ERESTARTSYS) {
xfs_perag_rele(pag);
break;
}
}
}