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authorDave Chinner <dchinner@redhat.com>2011-04-21 09:34:27 +0000
committerAlex Elder <aelder@sgi.com>2011-05-19 12:03:45 -0500
commit44396476a0f24e5174768d3732f1958857c26d22 (patch)
tree2581ab960427ac915ad0684a7d921476097b1d0d /fs
parentee58abdfcc8201f500107c7ba03f738af8b49b85 (diff)
xfs: reset buffer pointers before freeing them
When we free a vmapped buffer, we need to ensure the vmap address and length we free is the same as when it was allocated. In various places in the log code we change the memory the buffer is pointing to before issuing IO, but we never reset the buffer to point back to it's original memory (or no memory, if that is the case for the buffer). As a result, when we free the buffer it points to memory that is owned by something else and attempts to unmap and free it. Because the range does not match any known mapped range, it can trigger BUG_ON() traps in the vmap code, and potentially corrupt the vmap area tracking. Fix this by always resetting these buffers to their original state before freeing them. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.c21
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.h1
-rw-r--r--fs/xfs/xfs_log.c8
-rw-r--r--fs/xfs/xfs_log_recover.c75
4 files changed, 67 insertions, 38 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 098890357659..52b2b5da566e 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -708,6 +708,27 @@ xfs_buf_get_empty(
return bp;
}
+/*
+ * Return a buffer allocated as an empty buffer and associated to external
+ * memory via xfs_buf_associate_memory() back to it's empty state.
+ */
+void
+xfs_buf_set_empty(
+ struct xfs_buf *bp,
+ size_t len)
+{
+ if (bp->b_pages)
+ _xfs_buf_free_pages(bp);
+
+ bp->b_pages = NULL;
+ bp->b_page_count = 0;
+ bp->b_addr = NULL;
+ bp->b_file_offset = 0;
+ bp->b_buffer_length = bp->b_count_desired = len;
+ bp->b_bn = XFS_BUF_DADDR_NULL;
+ bp->b_flags &= ~XBF_MAPPED;
+}
+
static inline struct page *
mem_to_page(
void *addr)
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index a9a1c4512645..50a7d5fb3b73 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -178,6 +178,7 @@ extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
xfs_buf_flags_t);
extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
+extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len);
extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);
extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
extern void xfs_buf_hold(xfs_buf_t *);
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 18fd4beffcc3..211930246f20 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1449,6 +1449,13 @@ xlog_dealloc_log(xlog_t *log)
xlog_cil_destroy(log);
+ /*
+ * always need to ensure that the extra buffer does not point to memory
+ * owned by another log buffer before we free it.
+ */
+ xfs_buf_set_empty(log->l_xbuf, log->l_iclog_size);
+ xfs_buf_free(log->l_xbuf);
+
iclog = log->l_iclog;
for (i=0; i<log->l_iclog_bufs; i++) {
xfs_buf_free(iclog->ic_bp);
@@ -1458,7 +1465,6 @@ xlog_dealloc_log(xlog_t *log)
}
spinlock_destroy(&log->l_icloglock);
- xfs_buf_free(log->l_xbuf);
log->l_mp->m_log = NULL;
kmem_free(log);
} /* xlog_dealloc_log */
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 5cc464a17c93..04142caedb2b 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -205,6 +205,35 @@ xlog_bread(
}
/*
+ * Read at an offset into the buffer. Returns with the buffer in it's original
+ * state regardless of the result of the read.
+ */
+STATIC int
+xlog_bread_offset(
+ xlog_t *log,
+ xfs_daddr_t blk_no, /* block to read from */
+ int nbblks, /* blocks to read */
+ xfs_buf_t *bp,
+ xfs_caddr_t offset)
+{
+ xfs_caddr_t orig_offset = XFS_BUF_PTR(bp);
+ int orig_len = bp->b_buffer_length;
+ int error, error2;
+
+ error = XFS_BUF_SET_PTR(bp, offset, BBTOB(nbblks));
+ if (error)
+ return error;
+
+ error = xlog_bread_noalign(log, blk_no, nbblks, bp);
+
+ /* must reset buffer pointer even on error */
+ error2 = XFS_BUF_SET_PTR(bp, orig_offset, orig_len);
+ if (error)
+ return error;
+ return error2;
+}
+
+/*
* Write out the buffer at the given block for the given number of blocks.
* The buffer is kept locked across the write and is returned locked.
* This can only be used for synchronous log writes.
@@ -1229,20 +1258,12 @@ xlog_write_log_records(
*/
ealign = round_down(end_block, sectbb);
if (j == 0 && (start_block + endcount > ealign)) {
- offset = XFS_BUF_PTR(bp);
- balign = BBTOB(ealign - start_block);
- error = XFS_BUF_SET_PTR(bp, offset + balign,
- BBTOB(sectbb));
+ offset = XFS_BUF_PTR(bp) + BBTOB(ealign - start_block);
+ error = xlog_bread_offset(log, ealign, sectbb,
+ bp, offset);
if (error)
break;
- error = xlog_bread_noalign(log, ealign, sectbb, bp);
- if (error)
- break;
-
- error = XFS_BUF_SET_PTR(bp, offset, bufblks);
- if (error)
- break;
}
offset = xlog_align(log, start_block, endcount, bp);
@@ -3448,19 +3469,9 @@ xlog_do_recovery_pass(
* - order is important.
*/
wrapped_hblks = hblks - split_hblks;
- error = XFS_BUF_SET_PTR(hbp,
- offset + BBTOB(split_hblks),
- BBTOB(hblks - split_hblks));
- if (error)
- goto bread_err2;
-
- error = xlog_bread_noalign(log, 0,
- wrapped_hblks, hbp);
- if (error)
- goto bread_err2;
-
- error = XFS_BUF_SET_PTR(hbp, offset,
- BBTOB(hblks));
+ error = xlog_bread_offset(log, 0,
+ wrapped_hblks, hbp,
+ offset + BBTOB(split_hblks));
if (error)
goto bread_err2;
}
@@ -3511,19 +3522,9 @@ xlog_do_recovery_pass(
* _first_, then the log start (LR header end)
* - order is important.
*/
- error = XFS_BUF_SET_PTR(dbp,
- offset + BBTOB(split_bblks),
- BBTOB(bblks - split_bblks));
- if (error)
- goto bread_err2;
-
- error = xlog_bread_noalign(log, wrapped_hblks,
- bblks - split_bblks,
- dbp);
- if (error)
- goto bread_err2;
-
- error = XFS_BUF_SET_PTR(dbp, offset, h_size);
+ error = xlog_bread_offset(log, 0,
+ bblks - split_bblks, hbp,
+ offset + BBTOB(split_bblks));
if (error)
goto bread_err2;
}