[PATCH 16/18] xfs: kill xfs_read_buf()

Dave Chinner
2012-04-13T12:11:30Z

From: Dave Chinner <dchinner@redhat.com>

xfs_read_buf() is effectively the same as xfs_trans_read_buf() when called
outside a transaction context. The error handling is slightly different in that
xfs_read_buf stales the errored buffer it gets back, but there is probably good
reason for xfs_trans_read_buf() for doing this.

Hence update xfs_trans_read_buf() to the same error handling as xfs_read_buf(),
and convert all the callers of xfs_read_buf() to use the former function. We can
then remove xfs_read_buf().

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_attr.c | 4 ++--
fs/xfs/xfs_fsops.c | 2 +-
fs/xfs/xfs_log_recover.c | 11 ++++------
fs/xfs/xfs_rw.c | 50 ----------------------------------------------
fs/xfs/xfs_rw.h | 3 ---
fs/xfs/xfs_trans_buf.c | 4 ++++
6 files changed, 11 insertions(+), 63 deletions(-)

diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index c8ef9a9..ad85bed 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -1987,8 +1987,8 @@ xfs_attr_rmtval_get(xfs_da_args_t *args)
(map[i].br_startblock != HOLESTARTBLOCK));
dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
- error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
- blkcnt, XBF_DONT_BLOCK, &bp);
+ error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
+ dblkno, blkcnt, 0, &bp);
if (error)
return(error);

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 874d398..e9f5bc0 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -402,7 +402,7 @@ xfs_growfs_data_private(

/* update secondary superblocks. */
for (agno = 1; agno < nagcount; agno++) {
- error = xfs_read_buf(mp, mp->m_ddev_targp,
+ error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp);
if (error) {
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 6353eb3..b700ced 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2535,14 +2535,11 @@ xlog_recover_dquot_pass2(
return XFS_ERROR(EIO);
ASSERT(dq_f->qlf_len == 1);

- error = xfs_read_buf(mp, mp->m_ddev_targp,
- dq_f->qlf_blkno,
- XFS_FSB_TO_BB(mp, dq_f->qlf_len),
- 0, &bp);
- if (error) {
- xfs_buf_ioerror_alert(bp, "xlog_recover_do..(read#3)");
+ error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dq_f->qlf_blkno,
+ XFS_FSB_TO_BB(mp, dq_f->qlf_len), 0, &bp);
+ if (error)
return error;
- }
+
ASSERT(bp);
ddq = (xfs_disk_dquot_t *)xfs_buf_offset(bp, dq_f->qlf_boffset);

diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
index 2ce9775..3c2488a 100644
--- a/fs/xfs/xfs_rw.c
+++ b/fs/xfs/xfs_rw.c
@@ -92,56 +92,6 @@ xfs_do_force_shutdown(
}

/*
- * This isn't an absolute requirement, but it is
- * just a good idea to call xfs_read_buf instead of
- * directly doing a read_buf call. For one, we shouldn't
- * be doing this disk read if we are in SHUTDOWN state anyway,
- * so this stops that from happening. Secondly, this does all
- * the error checking stuff and the brelse if appropriate for
- * the caller, so the code can be a little leaner.
- */
-
-int
-xfs_read_buf(
- struct xfs_mount *mp,
- xfs_buftarg_t *target,
- xfs_daddr_t blkno,
- int len,
- uint flags,
- xfs_buf_t **bpp)
-{
- xfs_buf_t *bp;
- int error;
-
- if (!flags)
- flags = XBF_MAPPED;
-
- bp = xfs_buf_read(target, blkno, len, flags);
- if (!bp)
- return XFS_ERROR(EIO);
- error = bp->b_error;
- if (!error && !XFS_FORCED_SHUTDOWN(mp)) {
- *bpp = bp;
- } else {
- *bpp = NULL;
- if (error) {
- xfs_buf_ioerror_alert(bp, __func__);
- } else {
- error = XFS_ERROR(EIO);
- }
- if (bp) {
- XFS_BUF_UNDONE(bp);
- xfs_buf_stale(bp);
- /*
- * brelse clears B_ERROR and b_error
- */
- xfs_buf_relse(bp);
- }
- }
- return (error);
-}
-
-/*
* helper function to extract extent size hint from inode
*/
xfs_extlen_t
diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
index bbdb9ad..967b3a4 100644
--- a/fs/xfs/xfs_rw.h
+++ b/fs/xfs/xfs_rw.h
@@ -39,9 +39,6 @@ xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
/*
* Prototypes for functions in xfs_rw.c.
*/
-extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
- xfs_daddr_t blkno, int len, uint flags,
- struct xfs_buf **bpp);
extern xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);

#endif /* __XFS_RW_H__ */
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index f9cb7ee..5e4cf61 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -274,6 +274,8 @@ xfs_trans_read_buf(
xfs_buf_log_item_t *bip;
int error;

+ *bpp = NULL;
+
if (flags == 0)
flags = XBF_MAPPED;

@@ -289,6 +291,8 @@ xfs_trans_read_buf(
if (bp->b_error) {
error = bp->b_error;
xfs_buf_ioerror_alert(bp, __func__);
+ XFS_BUF_UNDONE(bp);
+ xfs_buf_stale(bp);
xfs_buf_relse(bp);
return error;
}
--
1.7.9.5