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xfs: introduce xfs_mod_frextents

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Add a new helper to modify the incore counter of free realtime
extents. This matches the helpers used for inode and data block
counters, and removes a significant users of the xfs_mod_incore_sb()
interface.

Based on a patch originally from Christoph Hellwig.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2015-02-23 21:22:54 +11:00 committed by Dave Chinner
parent 5681ca4006
commit bab98bbe6e
4 changed files with 34 additions and 21 deletions
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8
fs/xfs/libxfs/xfs_bmap.c
View file

@ -4158,8 +4158,7 @@ xfs_bmapi_reserve_delalloc(
ASSERT(indlen > 0);
if (rt) {
error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
-((int64_t)extsz), 0);
error = xfs_mod_frextents(mp, -((int64_t)extsz));
} else {
error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
}
@ -4194,7 +4193,7 @@ xfs_bmapi_reserve_delalloc(
out_unreserve_blocks:
if (rt)
xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
xfs_mod_frextents(mp, extsz);
else
xfs_mod_fdblocks(mp, alen, false);
out_unreserve_quota:
@ -5278,8 +5277,7 @@ xfs_bunmapi(
rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
do_div(rtexts, mp->m_sb.sb_rextsize);
xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
(int64_t)rtexts, 0);
xfs_mod_frextents(mp, (int64_t)rtexts);
(void)xfs_trans_reserve_quota_nblks(NULL,
ip, -((long)del.br_blockcount), 0,
XFS_QMOPT_RES_RTBLKS);

27
fs/xfs/xfs_mount.c
View file

@ -1198,6 +1198,24 @@ xfs_mod_fdblocks(
return -ENOSPC;
}
int
xfs_mod_frextents(
struct xfs_mount *mp,
int64_t delta)
{
int64_t lcounter;
int ret = 0;
spin_lock(&mp->m_sb_lock);
lcounter = mp->m_sb.sb_frextents + delta;
if (lcounter < 0)
ret = -ENOSPC;
else
mp->m_sb.sb_frextents = lcounter;
spin_unlock(&mp->m_sb_lock);
return ret;
}
/*
* xfs_mod_incore_sb_unlocked() is a utility routine commonly used to apply
* a delta to a specified field in the in-core superblock. Simply
@ -1227,16 +1245,9 @@ xfs_mod_incore_sb_unlocked(
case XFS_SBS_ICOUNT:
case XFS_SBS_IFREE:
case XFS_SBS_FDBLOCKS:
case XFS_SBS_FREXTENTS:
ASSERT(0);
return -EINVAL;
case XFS_SBS_FREXTENTS:
lcounter = (long long)mp->m_sb.sb_frextents;
lcounter += delta;
if (lcounter < 0) {
return -ENOSPC;
}
mp->m_sb.sb_frextents = lcounter;
return 0;
case XFS_SBS_DBLOCKS:
lcounter = (long long)mp->m_sb.sb_dblocks;
lcounter += delta;

2
fs/xfs/xfs_mount.h
View file

@ -331,6 +331,8 @@ extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
bool reserved);
extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
extern int xfs_mount_log_sb(xfs_mount_t *);
extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
extern int xfs_readsb(xfs_mount_t *, int);

18
fs/xfs/xfs_trans.c
View file

@ -235,8 +235,7 @@ xfs_trans_reserve(
* fail if the count would go below zero.
*/
if (rtextents > 0) {
error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
-((int64_t)rtextents), rsvd);
error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
if (error) {
error = -ENOSPC;
goto undo_log;
@ -562,10 +561,10 @@ xfs_trans_unreserve_and_mod_sb(
}
/* apply remaining deltas */
if (rtxdelta != 0) {
msbp->msb_field = XFS_SBS_FREXTENTS;
msbp->msb_delta = rtxdelta;
msbp++;
if (rtxdelta) {
error = xfs_mod_frextents(mp, rtxdelta);
if (error)
goto out_undo_ifree;
}
if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
@ -618,12 +617,15 @@ xfs_trans_unreserve_and_mod_sb(
error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
(uint)(msbp - msb), rsvd);
if (error)
goto out_undo_ifreecount;
goto out_undo_frextents;
}
return;
out_undo_ifreecount:
out_undo_frextents:
if (rtxdelta)
xfs_mod_frextents(mp, -rtxdelta);
out_undo_ifree:
if (ifreedelta)
xfs_mod_ifree(mp, -ifreedelta);
out_undo_icount: