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authorDarrick J. Wong <djwong@kernel.org>2023-08-10 17:48:03 +0300
committerDarrick J. Wong <djwong@kernel.org>2023-08-10 17:48:03 +0300
commit9ed851f695c71d325758f8c18e265da9316afd26 (patch)
treeea61f9dc00cbbc923eb71f0a7c5f3506e64f2b4f /fs/xfs
parent77a1396f9ff112d71460edc43d74a019ba420979 (diff)
downloadlinux-9ed851f695c71d325758f8c18e265da9316afd26.tar.xz
xfs: allow scanning ranges of the buffer cache for live buffers
After an online repair, we need to invalidate buffers representing the blocks from the old metadata that we're replacing. It's possible that parts of a tree that were previously cached in memory are no longer accessible due to media failure or other corruption on interior nodes, so repair figures out the old blocks from the reverse mapping data and scans the buffer cache directly. In other words, online fsck needs to find all the live (i.e. non-stale) buffers for a range of fsblocks so that it can invalidate them. Unfortunately, the current buffer cache code triggers asserts if the rhashtable lookup finds a non-stale buffer of a different length than the key we searched for. For regular operation this is desirable, but for this repair procedure, we don't care since we're going to forcibly stale the buffer anyway. Add an internal lookup flag to avoid the assert. Skip buffers that are already XBF_STALE. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/scrub/reap.c2
-rw-r--r--fs/xfs/xfs_buf.c9
-rw-r--r--fs/xfs/xfs_buf.h13
3 files changed, 22 insertions, 2 deletions
diff --git a/fs/xfs/scrub/reap.c b/fs/xfs/scrub/reap.c
index 847c6f836102..df13a9e0fe86 100644
--- a/fs/xfs/scrub/reap.c
+++ b/fs/xfs/scrub/reap.c
@@ -149,7 +149,7 @@ xrep_block_reap_binval(
*/
error = xfs_buf_incore(sc->mp->m_ddev_targp,
XFS_FSB_TO_DADDR(sc->mp, fsbno),
- XFS_FSB_TO_BB(sc->mp, 1), 0, &bp);
+ XFS_FSB_TO_BB(sc->mp, 1), XBF_LIVESCAN, &bp);
if (error)
return;
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 15d1e5a7c2d3..fa392c43ba16 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -481,7 +481,8 @@ _xfs_buf_obj_cmp(
* reallocating a busy extent. Skip this buffer and
* continue searching for an exact match.
*/
- ASSERT(bp->b_flags & XBF_STALE);
+ if (!(map->bm_flags & XBM_LIVESCAN))
+ ASSERT(bp->b_flags & XBF_STALE);
return 1;
}
return 0;
@@ -559,6 +560,10 @@ xfs_buf_find_lock(
* intact here.
*/
if (bp->b_flags & XBF_STALE) {
+ if (flags & XBF_LIVESCAN) {
+ xfs_buf_unlock(bp);
+ return -ENOENT;
+ }
ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
bp->b_flags &= _XBF_KMEM | _XBF_PAGES;
bp->b_ops = NULL;
@@ -682,6 +687,8 @@ xfs_buf_get_map(
int error;
int i;
+ if (flags & XBF_LIVESCAN)
+ cmap.bm_flags |= XBM_LIVESCAN;
for (i = 0; i < nmaps; i++)
cmap.bm_len += map[i].bm_len;
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 549c60942208..df8f47953bb4 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -44,6 +44,11 @@ struct xfs_buf;
#define _XBF_DELWRI_Q (1u << 22)/* buffer on a delwri queue */
/* flags used only as arguments to access routines */
+/*
+ * Online fsck is scanning the buffer cache for live buffers. Do not warn
+ * about length mismatches during lookups and do not return stale buffers.
+ */
+#define XBF_LIVESCAN (1u << 28)
#define XBF_INCORE (1u << 29)/* lookup only, return if found in cache */
#define XBF_TRYLOCK (1u << 30)/* lock requested, but do not wait */
#define XBF_UNMAPPED (1u << 31)/* do not map the buffer */
@@ -67,6 +72,7 @@ typedef unsigned int xfs_buf_flags_t;
{ _XBF_KMEM, "KMEM" }, \
{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
/* The following interface flags should never be set */ \
+ { XBF_LIVESCAN, "LIVESCAN" }, \
{ XBF_INCORE, "INCORE" }, \
{ XBF_TRYLOCK, "TRYLOCK" }, \
{ XBF_UNMAPPED, "UNMAPPED" }
@@ -114,8 +120,15 @@ typedef struct xfs_buftarg {
struct xfs_buf_map {
xfs_daddr_t bm_bn; /* block number for I/O */
int bm_len; /* size of I/O */
+ unsigned int bm_flags;
};
+/*
+ * Online fsck is scanning the buffer cache for live buffers. Do not warn
+ * about length mismatches during lookups and do not return stale buffers.
+ */
+#define XBM_LIVESCAN (1U << 0)
+
#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };