From: Dave Chinner <dchinner@xxxxxxxxxx>
Source kernel commit: 7dfee17b13e5024c5c0ab1911859ded4182de3e5
Bad things happen in defered extent freeing operations if it is
passed a bad block number in the xefi. This can come from a bogus
agno/agbno pair from deferred agfl freeing, or just a bad fsbno
being passed to __xfs_free_extent_later(). Either way, it's very
difficult to diagnose where a null perag oops in EFI creation
is coming from when the operation that queued the xefi has already
been completed and there's no longer any trace of it around....
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
---
libxfs/xfs_ag.c | 5 ++++-
libxfs/xfs_alloc.c | 16 +++++++++++++---
libxfs/xfs_alloc.h | 6 +++---
libxfs/xfs_bmap.c | 10 ++++++++--
libxfs/xfs_bmap_btree.c | 7 +++++--
libxfs/xfs_ialloc.c | 24 ++++++++++++++++--------
libxfs/xfs_refcount.c | 13 ++++++++++---
7 files changed, 59 insertions(+), 22 deletions(-)
diff --git a/libxfs/xfs_ag.c b/libxfs/xfs_ag.c
index 5d269312..c82afbb8 100644
--- a/libxfs/xfs_ag.c
+++ b/libxfs/xfs_ag.c
@@ -982,7 +982,10 @@ xfs_ag_shrink_space(
if (err2 != -ENOSPC)
goto resv_err;
- __xfs_free_extent_later(*tpp, args.fsbno, delta, NULL, true);
+ err2 = __xfs_free_extent_later(*tpp, args.fsbno, delta, NULL,
+ true);
+ if (err2)
+ goto resv_err;
/*
* Roll the transaction before trying to re-init the per-ag
diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
index 40a36efa..107a8492 100644
--- a/libxfs/xfs_alloc.c
+++ b/libxfs/xfs_alloc.c
@@ -2427,7 +2427,7 @@ xfs_agfl_reset(
* the real allocation can proceed. Deferring the free disconnects freeing up
* the AGFL slot from freeing the block.
*/
-STATIC void
+static int
xfs_defer_agfl_block(
struct xfs_trans *tp,
xfs_agnumber_t agno,
@@ -2446,17 +2446,21 @@ xfs_defer_agfl_block(
xefi->xefi_blockcount = 1;
xefi->xefi_owner = oinfo->oi_owner;
+ if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, xefi->xefi_startblock)))
+ return -EFSCORRUPTED;
+
trace_xfs_agfl_free_defer(mp, agno, 0, agbno, 1);
xfs_extent_free_get_group(mp, xefi);
xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_AGFL_FREE, &xefi->xefi_list);
+ return 0;
}
/*
* Add the extent to the list of extents to be free at transaction end.
* The list is maintained sorted (by block number).
*/
-void
+int
__xfs_free_extent_later(
struct xfs_trans *tp,
xfs_fsblock_t bno,
@@ -2483,6 +2487,9 @@ __xfs_free_extent_later(
#endif
ASSERT(xfs_extfree_item_cache != NULL);
+ if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbext(mp, bno, len)))
+ return -EFSCORRUPTED;
+
xefi = kmem_cache_zalloc(xfs_extfree_item_cache,
GFP_KERNEL | __GFP_NOFAIL);
xefi->xefi_startblock = bno;
@@ -2506,6 +2513,7 @@ __xfs_free_extent_later(
xfs_extent_free_get_group(mp, xefi);
xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_FREE, &xefi->xefi_list);
+ return 0;
}
#ifdef DEBUG
@@ -2666,7 +2674,9 @@ xfs_alloc_fix_freelist(
goto out_agbp_relse;
/* defer agfl frees */
- xfs_defer_agfl_block(tp, args->agno, bno, &targs.oinfo);
+ error = xfs_defer_agfl_block(tp, args->agno, bno, &targs.oinfo);
+ if (error)
+ goto out_agbp_relse;
}
targs.tp = tp;
diff --git a/libxfs/xfs_alloc.h b/libxfs/xfs_alloc.h
index 5dbb2554..85ac470b 100644
--- a/libxfs/xfs_alloc.h
+++ b/libxfs/xfs_alloc.h
@@ -230,7 +230,7 @@ xfs_buf_to_agfl_bno(
return bp->b_addr;
}
-void __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
+int __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
xfs_filblks_t len, const struct xfs_owner_info *oinfo,
bool skip_discard);
@@ -254,14 +254,14 @@ void xfs_extent_free_get_group(struct xfs_mount *mp,
#define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
#define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
-static inline void
+static inline int
xfs_free_extent_later(
struct xfs_trans *tp,
xfs_fsblock_t bno,
xfs_filblks_t len,
const struct xfs_owner_info *oinfo)
{
- __xfs_free_extent_later(tp, bno, len, oinfo, false);
+ return __xfs_free_extent_later(tp, bno, len, oinfo, false);
}
diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 18e0006f..5deeb472 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -565,8 +565,12 @@ xfs_bmap_btree_to_extents(
cblock = XFS_BUF_TO_BLOCK(cbp);
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
return error;
+
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
- xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo);
+ error = xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo);
+ if (error)
+ return error;
+
ip->i_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
@@ -5223,10 +5227,12 @@ xfs_bmap_del_extent_real(
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
xfs_refcount_decrease_extent(tp, del);
} else {
- __xfs_free_extent_later(tp, del->br_startblock,
+ error = __xfs_free_extent_later(tp, del->br_startblock,
del->br_blockcount, NULL,
(bflags & XFS_BMAPI_NODISCARD) ||
del->br_state == XFS_EXT_UNWRITTEN);
+ if (error)
+ goto done;
}
}
diff --git a/libxfs/xfs_bmap_btree.c b/libxfs/xfs_bmap_btree.c
index c87cb0f6..751e8165 100644
--- a/libxfs/xfs_bmap_btree.c
+++ b/libxfs/xfs_bmap_btree.c
@@ -266,11 +266,14 @@ xfs_bmbt_free_block(
struct xfs_trans *tp = cur->bc_tp;
xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp));
struct xfs_owner_info oinfo;
+ int error;
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, cur->bc_ino.whichfork);
- xfs_free_extent_later(cur->bc_tp, fsbno, 1, &oinfo);
+ error = xfs_free_extent_later(cur->bc_tp, fsbno, 1, &oinfo);
+ if (error)
+ return error;
+
ip->i_nblocks--;
-
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
return 0;
diff --git a/libxfs/xfs_ialloc.c b/libxfs/xfs_ialloc.c
index ee292356..42d8863e 100644
--- a/libxfs/xfs_ialloc.c
+++ b/libxfs/xfs_ialloc.c
@@ -1829,7 +1829,7 @@ xfs_dialloc(
* might be sparse and only free the regions that are allocated as part of the
* chunk.
*/
-STATIC void
+static int
xfs_difree_inode_chunk(
struct xfs_trans *tp,
xfs_agnumber_t agno,
@@ -1846,10 +1846,10 @@ xfs_difree_inode_chunk(
if (!xfs_inobt_issparse(rec->ir_holemask)) {
/* not sparse, calculate extent info directly */
- xfs_free_extent_later(tp, XFS_AGB_TO_FSB(mp, agno, sagbno),
- M_IGEO(mp)->ialloc_blks,
- &XFS_RMAP_OINFO_INODES);
- return;
+ return xfs_free_extent_later(tp,
+ XFS_AGB_TO_FSB(mp, agno, sagbno),
+ M_IGEO(mp)->ialloc_blks,
+ &XFS_RMAP_OINFO_INODES);
}
/* holemask is only 16-bits (fits in an unsigned long) */
@@ -1866,6 +1866,8 @@ xfs_difree_inode_chunk(
XFS_INOBT_HOLEMASK_BITS);
nextbit = startidx + 1;
while (startidx < XFS_INOBT_HOLEMASK_BITS) {
+ int error;
+
nextbit = find_next_zero_bit(holemask, XFS_INOBT_HOLEMASK_BITS,
nextbit);
/*
@@ -1891,8 +1893,11 @@ xfs_difree_inode_chunk(
ASSERT(agbno % mp->m_sb.sb_spino_align == 0);
ASSERT(contigblk % mp->m_sb.sb_spino_align == 0);
- xfs_free_extent_later(tp, XFS_AGB_TO_FSB(mp, agno, agbno),
- contigblk, &XFS_RMAP_OINFO_INODES);
+ error = xfs_free_extent_later(tp,
+ XFS_AGB_TO_FSB(mp, agno, agbno),
+ contigblk, &XFS_RMAP_OINFO_INODES);
+ if (error)
+ return error;
/* reset range to current bit and carry on... */
startidx = endidx = nextbit;
@@ -1900,6 +1905,7 @@ xfs_difree_inode_chunk(
next:
nextbit++;
}
+ return 0;
}
STATIC int
@@ -1998,7 +2004,9 @@ xfs_difree_inobt(
goto error0;
}
- xfs_difree_inode_chunk(tp, pag->pag_agno, &rec);
+ error = xfs_difree_inode_chunk(tp, pag->pag_agno, &rec);
+ if (error)
+ goto error0;
} else {
xic->deleted = false;
diff --git a/libxfs/xfs_refcount.c b/libxfs/xfs_refcount.c
index a406d6b2..0006ad7c 100644
--- a/libxfs/xfs_refcount.c
+++ b/libxfs/xfs_refcount.c
@@ -1150,8 +1150,10 @@ xfs_refcount_adjust_extents(
fsbno = XFS_AGB_TO_FSB(cur->bc_mp,
cur->bc_ag.pag->pag_agno,
tmp.rc_startblock);
- xfs_free_extent_later(cur->bc_tp, fsbno,
+ error = xfs_free_extent_later(cur->bc_tp, fsbno,
tmp.rc_blockcount, NULL);
+ if (error)
+ goto out_error;
}
(*agbno) += tmp.rc_blockcount;
@@ -1209,8 +1211,10 @@ xfs_refcount_adjust_extents(
fsbno = XFS_AGB_TO_FSB(cur->bc_mp,
cur->bc_ag.pag->pag_agno,
ext.rc_startblock);
- xfs_free_extent_later(cur->bc_tp, fsbno,
+ error = xfs_free_extent_later(cur->bc_tp, fsbno,
ext.rc_blockcount, NULL);
+ if (error)
+ goto out_error;
}
skip:
@@ -1975,7 +1979,10 @@ xfs_refcount_recover_cow_leftovers(
rr->rr_rrec.rc_blockcount);
/* Free the block. */
- xfs_free_extent_later(tp, fsb, rr->rr_rrec.rc_blockcount, NULL);
+ error = xfs_free_extent_later(tp, fsb,
+ rr->rr_rrec.rc_blockcount, NULL);
+ if (error)
+ goto out_trans;
error = xfs_trans_commit(tp);
if (error)
