From c7cb51dcb0a38624d42eeabb38502fa54a4d774b Mon Sep 17 00:00:00 2001 From: Jie Liu Date: Thu, 24 Jul 2014 12:18:47 +1000 Subject: [PATCH] xfs: fix error handling at xfs_inumbers From: Jie Liu 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 Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_itable.c | 97 +++++++++++++++++++-------------------------- 1 file 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; }