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xfs: cleanup xlog_bread 

Most callers of xlog_bread need to call xlog_align to get the actual offset.
Consolidate that call into the main xlog_bread and provide a _xlog_bread
for those few that don't want the actual offset.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2009-03-16 08:24:13 +01:00 committed by Christoph Hellwig
parent ff0205e032
commit 076e6acb8f
2 changed files with 138 additions and 88 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/xfs/xfs_log_priv.h
View File

@ -455,7 +455,6 @@ extern void xlog_recover_process_iunlinks(xlog_t *log);
extern struct xfs_buf *xlog_get_bp(xlog_t *, int);
extern void xlog_put_bp(struct xfs_buf *);
extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
extern kmem_zone_t *xfs_log_ticket_zone;

225
fs/xfs/xfs_log_recover.c
View File

@ -94,12 +94,30 @@ xlog_put_bp(
xfs_buf_free(bp);
}
STATIC xfs_caddr_t
xlog_align(
xlog_t *log,
xfs_daddr_t blk_no,
int nbblks,
xfs_buf_t *bp)
{
xfs_caddr_t ptr;
if (!log->l_sectbb_log)
return XFS_BUF_PTR(bp);
ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask);
ASSERT(XFS_BUF_SIZE(bp) >=
BBTOB(nbblks + (blk_no & log->l_sectbb_mask)));
return ptr;
}
/*
* nbblks should be uint, but oh well. Just want to catch that 32-bit length.
*/
int
xlog_bread(
STATIC int
xlog_bread_noalign(
xlog_t *log,
xfs_daddr_t blk_no,
int nbblks,
@ -137,6 +155,24 @@ xlog_bread(
return error;
}
STATIC int
xlog_bread(
xlog_t *log,
xfs_daddr_t blk_no,
int nbblks,
xfs_buf_t *bp,
xfs_caddr_t *offset)
{
int error;
error = xlog_bread_noalign(log, blk_no, nbblks, bp);
if (error)
return error;
*offset = xlog_align(log, blk_no, nbblks, bp);
return 0;
}
/*
* 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.
@ -180,24 +216,6 @@ xlog_bwrite(
return error;
}
STATIC xfs_caddr_t
xlog_align(
xlog_t *log,
xfs_daddr_t blk_no,
int nbblks,
xfs_buf_t *bp)
{
xfs_caddr_t ptr;
if (!log->l_sectbb_log)
return XFS_BUF_PTR(bp);
ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask);
ASSERT(XFS_BUF_SIZE(bp) >=
BBTOB(nbblks + (blk_no & log->l_sectbb_mask)));
return ptr;
}
#ifdef DEBUG
/*
* dump debug superblock and log record information
@ -321,9 +339,9 @@ xlog_find_cycle_start(
mid_blk = BLK_AVG(first_blk, *last_blk);
while (mid_blk != first_blk && mid_blk != *last_blk) {
if ((error = xlog_bread(log, mid_blk, 1, bp)))
error = xlog_bread(log, mid_blk, 1, bp, &offset);
if (error)
return error;
offset = xlog_align(log, mid_blk, 1, bp);
mid_cycle = xlog_get_cycle(offset);
if (mid_cycle == cycle) {
*last_blk = mid_blk;
@ -379,10 +397,10 @@ xlog_find_verify_cycle(
bcount = min(bufblks, (start_blk + nbblks - i));
if ((error = xlog_bread(log, i, bcount, bp)))
error = xlog_bread(log, i, bcount, bp, &buf);
if (error)
goto out;
buf = xlog_align(log, i, bcount, bp);
for (j = 0; j < bcount; j++) {
cycle = xlog_get_cycle(buf);
if (cycle == stop_on_cycle_no) {
@ -436,9 +454,9 @@ xlog_find_verify_log_record(
return ENOMEM;
smallmem = 1;
} else {
if ((error = xlog_bread(log, start_blk, num_blks, bp)))
error = xlog_bread(log, start_blk, num_blks, bp, &offset);
if (error)
goto out;
offset = xlog_align(log, start_blk, num_blks, bp);
offset += ((num_blks - 1) << BBSHIFT);
}
@ -453,9 +471,9 @@ xlog_find_verify_log_record(
}
if (smallmem) {
if ((error = xlog_bread(log, i, 1, bp)))
error = xlog_bread(log, i, 1, bp, &offset);
if (error)
goto out;
offset = xlog_align(log, i, 1, bp);
}
head = (xlog_rec_header_t *)offset;
@ -559,15 +577,18 @@ xlog_find_head(
bp = xlog_get_bp(log, 1);
if (!bp)
return ENOMEM;
if ((error = xlog_bread(log, 0, 1, bp)))
error = xlog_bread(log, 0, 1, bp, &offset);
if (error)
goto bp_err;
offset = xlog_align(log, 0, 1, bp);
first_half_cycle = xlog_get_cycle(offset);
last_blk = head_blk = log_bbnum - 1; /* get cycle # of last block */
if ((error = xlog_bread(log, last_blk, 1, bp)))
error = xlog_bread(log, last_blk, 1, bp, &offset);
if (error)
goto bp_err;
offset = xlog_align(log, last_blk, 1, bp);
last_half_cycle = xlog_get_cycle(offset);
ASSERT(last_half_cycle != 0);
@ -817,9 +838,10 @@ xlog_find_tail(
if (!bp)
return ENOMEM;
if (*head_blk == 0) { /* special case */
if ((error = xlog_bread(log, 0, 1, bp)))
error = xlog_bread(log, 0, 1, bp, &offset);
if (error)
goto bread_err;
offset = xlog_align(log, 0, 1, bp);
if (xlog_get_cycle(offset) == 0) {
*tail_blk = 0;
/* leave all other log inited values alone */
@ -832,9 +854,10 @@ xlog_find_tail(
*/
ASSERT(*head_blk < INT_MAX);
for (i = (int)(*head_blk) - 1; i >= 0; i--) {
if ((error = xlog_bread(log, i, 1, bp)))
error = xlog_bread(log, i, 1, bp, &offset);
if (error)
goto bread_err;
offset = xlog_align(log, i, 1, bp);
if (XLOG_HEADER_MAGIC_NUM == be32_to_cpu(*(__be32 *)offset)) {
found = 1;
break;
@ -848,9 +871,10 @@ xlog_find_tail(
*/
if (!found) {
for (i = log->l_logBBsize - 1; i >= (int)(*head_blk); i--) {
if ((error = xlog_bread(log, i, 1, bp)))
error = xlog_bread(log, i, 1, bp, &offset);
if (error)
goto bread_err;
offset = xlog_align(log, i, 1, bp);
if (XLOG_HEADER_MAGIC_NUM ==
be32_to_cpu(*(__be32 *)offset)) {
found = 2;
@ -922,10 +946,10 @@ xlog_find_tail(
if (*head_blk == after_umount_blk &&
be32_to_cpu(rhead->h_num_logops) == 1) {
umount_data_blk = (i + hblks) % log->l_logBBsize;
if ((error = xlog_bread(log, umount_data_blk, 1, bp))) {
error = xlog_bread(log, umount_data_blk, 1, bp, &offset);
if (error)
goto bread_err;
}
offset = xlog_align(log, umount_data_blk, 1, bp);
op_head = (xlog_op_header_t *)offset;
if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) {
/*
@ -1017,9 +1041,10 @@ xlog_find_zeroed(
bp = xlog_get_bp(log, 1);
if (!bp)
return ENOMEM;
if ((error = xlog_bread(log, 0, 1, bp)))
error = xlog_bread(log, 0, 1, bp, &offset);
if (error)
goto bp_err;
offset = xlog_align(log, 0, 1, bp);
first_cycle = xlog_get_cycle(offset);
if (first_cycle == 0) { /* completely zeroed log */
*blk_no = 0;
@ -1028,9 +1053,10 @@ xlog_find_zeroed(
}
/* check partially zeroed log */
if ((error = xlog_bread(log, log_bbnum-1, 1, bp)))
error = xlog_bread(log, log_bbnum-1, 1, bp, &offset);
if (error)
goto bp_err;
offset = xlog_align(log, log_bbnum-1, 1, bp);
last_cycle = xlog_get_cycle(offset);
if (last_cycle != 0) { /* log completely written to */
xlog_put_bp(bp);
@ -1152,10 +1178,10 @@ xlog_write_log_records(
*/
balign = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, start_block);
if (balign != start_block) {
if ((error = xlog_bread(log, start_block, 1, bp))) {
xlog_put_bp(bp);
return error;
}
error = xlog_bread_noalign(log, start_block, 1, bp);
if (error)
goto out_put_bp;
j = start_block - balign;
}
@ -1175,10 +1201,14 @@ xlog_write_log_records(
balign = BBTOB(ealign - start_block);
error = XFS_BUF_SET_PTR(bp, offset + balign,
BBTOB(sectbb));
if (!error)
error = xlog_bread(log, ealign, sectbb, bp);
if (!error)
error = XFS_BUF_SET_PTR(bp, offset, bufblks);
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;
}
@ -1195,6 +1225,8 @@ xlog_write_log_records(
start_block += endcount;
j = 0;
}
out_put_bp:
xlog_put_bp(bp);
return error;
}
@ -3481,9 +3513,11 @@ xlog_do_recovery_pass(
hbp = xlog_get_bp(log, 1);
if (!hbp)
return ENOMEM;
if ((error = xlog_bread(log, tail_blk, 1, hbp)))
error = xlog_bread(log, tail_blk, 1, hbp, &offset);
if (error)
goto bread_err1;
offset = xlog_align(log, tail_blk, 1, hbp);
rhead = (xlog_rec_header_t *)offset;
error = xlog_valid_rec_header(log, rhead, tail_blk);
if (error)
@ -3517,9 +3551,10 @@ xlog_do_recovery_pass(
memset(rhash, 0, sizeof(rhash));
if (tail_blk <= head_blk) {
for (blk_no = tail_blk; blk_no < head_blk; ) {
if ((error = xlog_bread(log, blk_no, hblks, hbp)))
error = xlog_bread(log, blk_no, hblks, hbp, &offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no, hblks, hbp);
rhead = (xlog_rec_header_t *)offset;
error = xlog_valid_rec_header(log, rhead, blk_no);
if (error)
@ -3527,10 +3562,11 @@ xlog_do_recovery_pass(
/* blocks in data section */
bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
error = xlog_bread(log, blk_no + hblks, bblks, dbp);
error = xlog_bread(log, blk_no + hblks, bblks, dbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no + hblks, bblks, dbp);
xlog_unpack_data(rhead, offset, log);
if ((error = xlog_recover_process_data(log,
rhash, rhead, offset, pass)))
@ -3553,10 +3589,10 @@ xlog_do_recovery_pass(
wrapped_hblks = 0;
if (blk_no + hblks <= log->l_logBBsize) {
/* Read header in one read */
error = xlog_bread(log, blk_no, hblks, hbp);
error = xlog_bread(log, blk_no, hblks, hbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no, hblks, hbp);
} else {
/* This LR is split across physical log end */
if (blk_no != log->l_logBBsize) {
@ -3564,12 +3600,13 @@ xlog_do_recovery_pass(
ASSERT(blk_no <= INT_MAX);
split_hblks = log->l_logBBsize - (int)blk_no;
ASSERT(split_hblks > 0);
if ((error = xlog_bread(log, blk_no,
split_hblks, hbp)))
error = xlog_bread(log, blk_no,
split_hblks, hbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no,
split_hblks, hbp);
}
/*
* Note: this black magic still works with
* large sector sizes (non-512) only because:
@ -3587,14 +3624,19 @@ xlog_do_recovery_pass(
error = XFS_BUF_SET_PTR(hbp,
bufaddr + BBTOB(split_hblks),
BBTOB(hblks - split_hblks));
if (!error)
error = xlog_bread(log, 0,
wrapped_hblks, hbp);
if (!error)
error = XFS_BUF_SET_PTR(hbp, bufaddr,
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, bufaddr,
BBTOB(hblks));
if (error)
goto bread_err2;
if (!offset)
offset = xlog_align(log, 0,
wrapped_hblks, hbp);
@ -3610,10 +3652,10 @@ xlog_do_recovery_pass(
/* Read in data for log record */
if (blk_no + bblks <= log->l_logBBsize) {
error = xlog_bread(log, blk_no, bblks, dbp);
error = xlog_bread(log, blk_no, bblks, dbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no, bblks, dbp);
} else {
/* This log record is split across the
* physical end of log */
@ -3627,12 +3669,13 @@ xlog_do_recovery_pass(
split_bblks =
log->l_logBBsize - (int)blk_no;
ASSERT(split_bblks > 0);
if ((error = xlog_bread(log, blk_no,
split_bblks, dbp)))
error = xlog_bread(log, blk_no,
split_bblks, dbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no,
split_bblks, dbp);
}
/*
* Note: this black magic still works with
* large sector sizes (non-512) only because:
@ -3649,15 +3692,19 @@ xlog_do_recovery_pass(
error = XFS_BUF_SET_PTR(dbp,
bufaddr + BBTOB(split_bblks),
BBTOB(bblks - split_bblks));
if (!error)
error = xlog_bread(log, wrapped_hblks,
bblks - split_bblks,
dbp);
if (!error)
error = XFS_BUF_SET_PTR(dbp, bufaddr,
h_size);
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, bufaddr, h_size);
if (error)
goto bread_err2;
if (!offset)
offset = xlog_align(log, wrapped_hblks,
bblks - split_bblks, dbp);
@ -3674,17 +3721,21 @@ xlog_do_recovery_pass(
/* read first part of physical log */
while (blk_no < head_blk) {
if ((error = xlog_bread(log, blk_no, hblks, hbp)))
error = xlog_bread(log, blk_no, hblks, hbp, &offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no, hblks, hbp);
rhead = (xlog_rec_header_t *)offset;
error = xlog_valid_rec_header(log, rhead, blk_no);
if (error)
goto bread_err2;
bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
if ((error = xlog_bread(log, blk_no+hblks, bblks, dbp)))
error = xlog_bread(log, blk_no+hblks, bblks, dbp,
&offset);
if (error)
goto bread_err2;
offset = xlog_align(log, blk_no+hblks, bblks, dbp);
xlog_unpack_data(rhead, offset, log);
if ((error = xlog_recover_process_data(log, rhash,
rhead, offset, pass)))