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authorJie Liu <jeff.liu@oracle.com>2014-07-24 12:18:47 +1000
committerDave Chinner <david@fromorbit.com>2014-07-24 12:18:47 +1000
commitc7cb51dcb0a38624d42eeabb38502fa54a4d774b (patch)
tree5a4fa186782c9e3023056e2e34a6bdf0779fedde /fs/xfs
parent549fa00679dd14beaaa685486549c637e8e02182 (diff)
xfs: fix error handling at xfs_inumbers
From: Jie Liu <jeff.liu@oracle.com> To fetch the file system number tables, we currently just ignore the errors and proceed to loop over the next AG or bump agino to the next chunk in case of btree operations failed, that is not properly because those errors might hint us potential file system problems. This patch rework xfs_inumbers() to handle the btree operation errors as well as the loop conditions. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_itable.c97
1 files changed, 40 insertions, 57 deletions
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index df7605183aa2..ed042fff9337 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -536,7 +536,7 @@ xfs_inumbers(
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, *lastino);
xfs_agino_t agino = XFS_INO_TO_AGINO(mp, *lastino);
struct xfs_btree_cur *cur = NULL;
- xfs_buf_t *agbp = NULL;
+ struct xfs_buf *agbp = NULL;
struct xfs_inogrp *buffer;
int bcount;
int left = *count;
@@ -550,61 +550,40 @@ xfs_inumbers(
bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
- while (left > 0 && agno < mp->m_sb.sb_agcount) {
+ do {
struct xfs_inobt_rec_incore r;
int stat;
- if (agbp == NULL) {
+ if (!agbp) {
error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
- if (error) {
- /*
- * If we can't read the AGI of this ag,
- * then just skip to the next one.
- */
- ASSERT(cur == NULL);
- agbp = NULL;
- agno++;
- agino = 0;
- continue;
- }
+ if (error)
+ break;
+
cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
XFS_BTNUM_INO);
error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
&stat);
- if (error) {
- xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
- cur = NULL;
- xfs_buf_relse(agbp);
- agbp = NULL;
- /*
- * Move up the last inode in the current
- * chunk. The lookup_ge will always get
- * us the first inode in the next chunk.
- */
- agino += XFS_INODES_PER_CHUNK - 1;
- continue;
- }
+ if (error)
+ break;
+ if (!stat)
+ goto next_ag;
}
+
error = xfs_inobt_get_rec(cur, &r, &stat);
- if (error || stat == 0) {
- xfs_buf_relse(agbp);
- agbp = NULL;
- xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
- cur = NULL;
- agno++;
- agino = 0;
- continue;
- }
+ if (error)
+ break;
+ if (!stat)
+ goto next_ag;
+
agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
buffer[bufidx].xi_startino =
XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
buffer[bufidx].xi_alloccount =
XFS_INODES_PER_CHUNK - r.ir_freecount;
buffer[bufidx].xi_allocmask = ~r.ir_free;
- bufidx++;
- left--;
- if (bufidx == bcount) {
- long written;
+ if (++bufidx == bcount) {
+ long written;
+
error = formatter(ubuffer, buffer, bufidx, &written);
if (error)
break;
@@ -612,36 +591,40 @@ xfs_inumbers(
*count += bufidx;
bufidx = 0;
}
- if (left) {
- error = xfs_btree_increment(cur, 0, &stat);
- if (error) {
- xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
- cur = NULL;
- xfs_buf_relse(agbp);
- agbp = NULL;
- /*
- * The agino value has already been bumped.
- * Just try to skip up to it.
- */
- agino += XFS_INODES_PER_CHUNK;
- continue;
- }
- }
- }
+ if (!--left)
+ break;
+
+ error = xfs_btree_increment(cur, 0, &stat);
+ if (error)
+ break;
+ if (stat)
+ continue;
+
+next_ag:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ cur = NULL;
+ xfs_buf_relse(agbp);
+ agbp = NULL;
+ agino = 0;
+ } while (++agno < mp->m_sb.sb_agcount);
+
if (!error) {
if (bufidx) {
- long written;
+ long written;
+
error = formatter(ubuffer, buffer, bufidx, &written);
if (!error)
*count += bufidx;
}
*lastino = XFS_AGINO_TO_INO(mp, agno, agino);
}
+
kmem_free(buffer);
if (cur)
xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
XFS_BTREE_NOERROR));
if (agbp)
xfs_buf_relse(agbp);
+
return error;
}