xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

xfs: verify btree blocks as they are read from disk

Browse Source 
Add an btree block verify callback function and pass it into the
buffer read functions. Because each different btree block type
requires different verification, add a function to the ops structure
that is called from the generic code.

Also, propagate the verification callback functions through the
readahead functions, and into the external bmap and bulkstat inode
readahead code that uses the generic btree buffer read functions.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner
2012-11-12 22:54:08 +11:00
committed by Ben Myers
parent af133e8606
commit 3d3e6f64e2
10 changed files with 229 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
fs/xfs/xfs_bmap_btree.c
View File

@@ -36,6 +36,7 @@
#include "xfs_bmap.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trace.h"
/*
* Determine the extent state.
@@ -707,6 +708,51 @@ xfs_bmbt_key_diff(
cur->bc_rec.b.br_startoff;
}
void
xfs_bmbt_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
unsigned int level;
int lblock_ok; /* block passes checks */
/* magic number and level verification.
*
* We don't know waht fork we belong to, so just verify that the level
* is less than the maximum of the two. Later checks will be more
* precise.
*/
level = be16_to_cpu(block->bb_level);
lblock_ok = block->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC) &&
level < max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]);
/* numrecs verification */
lblock_ok = lblock_ok &&
be16_to_cpu(block->bb_numrecs) <= mp->m_bmap_dmxr[level != 0];
/* sibling pointer verification */
lblock_ok = lblock_ok &&
block->bb_u.l.bb_leftsib &&
(block->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO) ||
XFS_FSB_SANITY_CHECK(mp,
be64_to_cpu(block->bb_u.l.bb_leftsib))) &&
block->bb_u.l.bb_rightsib &&
(block->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO) ||
XFS_FSB_SANITY_CHECK(mp,
be64_to_cpu(block->bb_u.l.bb_rightsib)));
if (!lblock_ok) {
trace_xfs_btree_corrupt(bp, _RET_IP_);
XFS_CORRUPTION_ERROR("xfs_bmbt_read_verify",
XFS_ERRLEVEL_LOW, mp, block);
xfs_buf_ioerror(bp, EFSCORRUPTED);
}
bp->b_iodone = NULL;
xfs_buf_ioend(bp, 0);
}
#ifdef DEBUG
STATIC int
xfs_bmbt_keys_inorder(
@@ -746,6 +792,7 @@ static const struct xfs_btree_ops xfs_bmbt_ops = {
.init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
.init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
.key_diff = xfs_bmbt_key_diff,
.read_verify = xfs_bmbt_read_verify,
#ifdef DEBUG
.keys_inorder = xfs_bmbt_keys_inorder,
.recs_inorder = xfs_bmbt_recs_inorder,