xfs: factor agf counter updates into a helper
Updating the AGF and transactions counters is duplicated between allocating
and freeing extents. Factor the code into a common helper.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index b5af107..4bc3c64 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -463,6 +463,27 @@
return 0;
}
+STATIC int
+xfs_alloc_update_counters(
+ struct xfs_trans *tp,
+ struct xfs_perag *pag,
+ struct xfs_buf *agbp,
+ long len)
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+
+ pag->pagf_freeblks += len;
+ be32_add_cpu(&agf->agf_freeblks, len);
+
+ xfs_trans_agblocks_delta(tp, len);
+ if (unlikely(be32_to_cpu(agf->agf_freeblks) >
+ be32_to_cpu(agf->agf_length)))
+ return EFSCORRUPTED;
+
+ xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS);
+ return 0;
+}
+
/*
* Allocation group level functions.
*/
@@ -504,49 +525,44 @@
ASSERT(0);
/* NOTREACHED */
}
- if (error)
+
+ if (error || args->agbno == NULLAGBLOCK)
return error;
- /*
- * If the allocation worked, need to change the agf structure
- * (and log it), and the superblock.
- */
- if (args->agbno != NULLAGBLOCK) {
- xfs_agf_t *agf; /* allocation group freelist header */
- long slen = (long)args->len;
- ASSERT(args->len >= args->minlen && args->len <= args->maxlen);
- ASSERT(!(args->wasfromfl) || !args->isfl);
- ASSERT(args->agbno % args->alignment == 0);
- if (!(args->wasfromfl)) {
+ ASSERT(args->len >= args->minlen);
+ ASSERT(args->len <= args->maxlen);
+ ASSERT(!args->wasfromfl || !args->isfl);
+ ASSERT(args->agbno % args->alignment == 0);
- agf = XFS_BUF_TO_AGF(args->agbp);
- be32_add_cpu(&agf->agf_freeblks, -(args->len));
- xfs_trans_agblocks_delta(args->tp,
- -((long)(args->len)));
- args->pag->pagf_freeblks -= args->len;
- ASSERT(be32_to_cpu(agf->agf_freeblks) <=
- be32_to_cpu(agf->agf_length));
- xfs_alloc_log_agf(args->tp, args->agbp,
- XFS_AGF_FREEBLKS);
- /*
- * Search the busylist for these blocks and mark the
- * transaction as synchronous if blocks are found. This
- * avoids the need to block due to a synchronous log
- * force to ensure correct ordering as the synchronous
- * transaction will guarantee that for us.
- */
- if (xfs_alloc_busy_search(args->mp, args->agno,
- args->agbno, args->len))
- xfs_trans_set_sync(args->tp);
- }
- if (!args->isfl)
- xfs_trans_mod_sb(args->tp,
- args->wasdel ? XFS_TRANS_SB_RES_FDBLOCKS :
- XFS_TRANS_SB_FDBLOCKS, -slen);
- XFS_STATS_INC(xs_allocx);
- XFS_STATS_ADD(xs_allocb, args->len);
+ if (!args->wasfromfl) {
+ error = xfs_alloc_update_counters(args->tp, args->pag,
+ args->agbp,
+ -((long)(args->len)));
+ if (error)
+ return error;
+
+ /*
+ * Search the busylist for these blocks and mark the
+ * transaction as synchronous if blocks are found. This
+ * avoids the need to block due to a synchronous log
+ * force to ensure correct ordering as the synchronous
+ * transaction will guarantee that for us.
+ */
+ if (xfs_alloc_busy_search(args->mp, args->agno,
+ args->agbno, args->len))
+ xfs_trans_set_sync(args->tp);
}
- return 0;
+
+ if (!args->isfl) {
+ xfs_trans_mod_sb(args->tp, args->wasdel ?
+ XFS_TRANS_SB_RES_FDBLOCKS :
+ XFS_TRANS_SB_FDBLOCKS,
+ -((long)(args->len)));
+ }
+
+ XFS_STATS_INC(xs_allocx);
+ XFS_STATS_ADD(xs_allocb, args->len);
+ return error;
}
/*
@@ -1385,6 +1401,7 @@
xfs_mount_t *mp; /* mount point struct for filesystem */
xfs_agblock_t nbno; /* new starting block of freespace */
xfs_extlen_t nlen; /* new length of freespace */
+ xfs_perag_t *pag; /* per allocation group data */
mp = tp->t_mountp;
/*
@@ -1583,30 +1600,20 @@
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR);
cnt_cur = NULL;
+
/*
* Update the freespace totals in the ag and superblock.
*/
- {
- xfs_agf_t *agf;
- xfs_perag_t *pag; /* per allocation group data */
+ pag = xfs_perag_get(mp, agno);
+ error = xfs_alloc_update_counters(tp, pag, agbp, len);
+ xfs_perag_put(pag);
+ if (error)
+ goto error0;
- pag = xfs_perag_get(mp, agno);
- pag->pagf_freeblks += len;
- xfs_perag_put(pag);
-
- agf = XFS_BUF_TO_AGF(agbp);
- be32_add_cpu(&agf->agf_freeblks, len);
- xfs_trans_agblocks_delta(tp, len);
- XFS_WANT_CORRUPTED_GOTO(
- be32_to_cpu(agf->agf_freeblks) <=
- be32_to_cpu(agf->agf_length),
- error0);
- xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS);
- if (!isfl)
- xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, (long)len);
- XFS_STATS_INC(xs_freex);
- XFS_STATS_ADD(xs_freeb, len);
- }
+ if (!isfl)
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, (long)len);
+ XFS_STATS_INC(xs_freex);
+ XFS_STATS_ADD(xs_freeb, len);
trace_xfs_free_extent(mp, agno, bno, len, isfl, haveleft, haveright);