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xfs: add buffer pre-write callback 

Add a callback to the buffer write path to enable verification of
the buffer and CRC calculation prior to issuing the write to the
underlying storage.

If the callback function detects some kind of failure or error
condition, it must mark the buffer with an error so that the caller
can take appropriate action. In the case of xfs_buf_ioapply(), a
corrupt metadta buffer willt rigger a shutdown of the filesystem,
because something is clearly wrong and we can't allow corrupt
metadata to be written to disk.

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 22:54:19 +11:00 committed by Ben Myers
parent da6958c873
commit cfb0285222
2 changed files with 19 additions and 0 deletions
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16
fs/xfs/xfs_buf.c
View File

@ -569,7 +569,9 @@ found:
*/
if (bp->b_flags & XBF_STALE) {
ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
ASSERT(bp->b_iodone == NULL);
bp->b_flags &= _XBF_KMEM | _XBF_PAGES;
bp->b_pre_io = NULL;
}
trace_xfs_buf_find(bp, flags, _RET_IP_);
@ -1323,6 +1325,20 @@ _xfs_buf_ioapply(
/* we only use the buffer cache for meta-data */
rw |= REQ_META;
/*
* run the pre-io callback function if it exists. If this function
* fails it will mark the buffer with an error and the IO should
* not be dispatched.
*/
if (bp->b_pre_io) {
bp->b_pre_io(bp);
if (bp->b_error) {
xfs_force_shutdown(bp->b_target->bt_mount,
SHUTDOWN_CORRUPT_INCORE);
return;
}
}
/*
* Walk all the vectors issuing IO on them. Set up the initial offset
* into the buffer and the desired IO size before we start -

3
fs/xfs/xfs_buf.h
View File

@ -155,6 +155,9 @@ typedef struct xfs_buf {
unsigned int b_offset; /* page offset in first page */
unsigned short b_error; /* error code on I/O */
void (*b_pre_io)(struct xfs_buf *);
/* pre-io callback function */
#ifdef XFS_BUF_LOCK_TRACKING
int b_last_holder;
#endif