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ext4: use common helpers in all places reading metadata buffers

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Revome all open codes that read metadata buffers, switch to use
ext4_read_bh_*() common helpers.

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Suggested-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200924073337.861472-4-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
zhangyi (F) 2020-09-24 15:33:33 +08:00 committed by Theodore Ts'o
parent fa491b14cd
commit 2d069c0889
9 changed files with 36 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/ext4/balloc.c
View File

@ -494,12 +494,10 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group,
* submit the buffer_head for reading
*/
set_buffer_new(bh);
clear_buffer_verified(bh);
trace_ext4_read_block_bitmap_load(sb, block_group, ignore_locked);
bh->b_end_io = ext4_end_bitmap_read;
get_bh(bh);
submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO |
(ignore_locked ? REQ_RAHEAD : 0), bh);
ext4_read_bh_nowait(bh, REQ_META | REQ_PRIO |
(ignore_locked ? REQ_RAHEAD : 0),
ext4_end_bitmap_read);
return bh;
verify:
err = ext4_validate_block_bitmap(sb, desc, block_group, bh);

3
fs/ext4/extents.c
View File

@ -501,8 +501,7 @@ __read_extent_tree_block(const char *function, unsigned int line,
if (!bh_uptodate_or_lock(bh)) {
trace_ext4_ext_load_extent(inode, pblk, _RET_IP_);
clear_buffer_verified(bh);
err = bh_submit_read(bh);
err = ext4_read_bh(bh, 0, NULL);
if (err < 0)
goto errout;
}

6
fs/ext4/ialloc.c
View File

@ -188,12 +188,8 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
/*
* submit the buffer_head for reading
*/
clear_buffer_verified(bh);
trace_ext4_load_inode_bitmap(sb, block_group);
bh->b_end_io = ext4_end_bitmap_read;
get_bh(bh);
submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);
wait_on_buffer(bh);
ext4_read_bh(bh, REQ_META | REQ_PRIO, ext4_end_bitmap_read);
ext4_simulate_fail_bh(sb, bh, EXT4_SIM_IBITMAP_EIO);
if (!buffer_uptodate(bh)) {
put_bh(bh);

2
fs/ext4/indirect.c
View File

@ -163,7 +163,7 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth,
}
if (!bh_uptodate_or_lock(bh)) {
if (bh_submit_read(bh) < 0) {
if (ext4_read_bh(bh, 0, NULL) < 0) {
put_bh(bh);
goto failure;
}

35
fs/ext4/inode.c
View File

@ -878,19 +878,20 @@ struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
ext4_lblk_t block, int map_flags)
{
struct buffer_head *bh;
int ret;
bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
if (!bh || ext4_buffer_uptodate(bh))
return bh;
clear_buffer_verified(bh);
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
put_bh(bh);
return ERR_PTR(-EIO);
ret = ext4_read_bh_lock(bh, REQ_META | REQ_PRIO, true);
if (ret) {
put_bh(bh);
return ERR_PTR(ret);
}
return bh;
}
/* Read a contiguous batch of blocks. */
@ -910,11 +911,8 @@ int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
for (i = 0; i < bh_count; i++)
/* Note that NULL bhs[i] is valid because of holes. */
if (bhs[i] && !ext4_buffer_uptodate(bhs[i])) {
clear_buffer_verified(bhs[i]);
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1,
&bhs[i]);
}
if (bhs[i] && !ext4_buffer_uptodate(bhs[i]))
ext4_read_bh_lock(bhs[i], REQ_META | REQ_PRIO, false);
if (!wait)
return 0;
@ -1084,7 +1082,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
!buffer_unwritten(bh) &&
(block_start < from || block_end > to)) {
ll_rw_block(REQ_OP_READ, 0, 1, &bh);
ext4_read_bh_lock(bh, 0, false);
wait[nr_wait++] = bh;
}
}
@ -3756,11 +3754,8 @@ static int __ext4_block_zero_page_range(handle_t *handle,
set_buffer_uptodate(bh);
if (!buffer_uptodate(bh)) {
err = -EIO;
ll_rw_block(REQ_OP_READ, 0, 1, &bh);
wait_on_buffer(bh);
/* Uhhuh. Read error. Complain and punt. */
if (!buffer_uptodate(bh))
err = ext4_read_bh_lock(bh, 0, true);
if (err)
goto unlock;
if (fscrypt_inode_uses_fs_layer_crypto(inode)) {
/* We expect the key to be set. */
@ -4404,9 +4399,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
* Read the block from disk.
*/
trace_ext4_load_inode(inode);
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);
ext4_read_bh_nowait(bh, REQ_META | REQ_PRIO, NULL);
blk_finish_plug(&plug);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {

10
fs/ext4/mmp.c
View File

@ -85,15 +85,11 @@ static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
}
}
get_bh(*bh);
lock_buffer(*bh);
(*bh)->b_end_io = end_buffer_read_sync;
submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
ret = -EIO;
ret = ext4_read_bh(*bh, REQ_META | REQ_PRIO, NULL);
if (ret)
goto warn_exit;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC) {
ret = -EFSCORRUPTED;

2
fs/ext4/move_extent.c
View File

@ -215,7 +215,7 @@ mext_page_mkuptodate(struct page *page, unsigned from, unsigned to)
for (i = 0; i < nr; i++) {
bh = arr[i];
if (!bh_uptodate_or_lock(bh)) {
err = bh_submit_read(bh);
err = ext4_read_bh(bh, 0, NULL);
if (err)
return err;
}

2
fs/ext4/resize.c
View File

@ -1245,7 +1245,7 @@ static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
if (unlikely(!bh))
return NULL;
if (!bh_uptodate_or_lock(bh)) {
if (bh_submit_read(bh) < 0) {
if (ext4_read_bh(bh, 0, NULL) < 0) {
brelse(bh);
return NULL;
}

22
fs/ext4/super.c
View File

@ -212,19 +212,21 @@ int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
struct buffer_head *
ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
{
struct buffer_head *bh = sb_getblk(sb, block);
struct buffer_head *bh;
int ret;
bh = sb_getblk(sb, block);
if (bh == NULL)
return ERR_PTR(-ENOMEM);
if (ext4_buffer_uptodate(bh))
return bh;
clear_buffer_verified(bh);
ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
put_bh(bh);
return ERR_PTR(-EIO);
ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
if (ret) {
put_bh(bh);
return ERR_PTR(ret);
}
return bh;
}
static int ext4_verify_csum_type(struct super_block *sb,
@ -5176,9 +5178,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
goto out_bdev;
}
journal->j_private = sb;
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
wait_on_buffer(journal->j_sb_buffer);
if (!buffer_uptodate(journal->j_sb_buffer)) {
if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
ext4_msg(sb, KERN_ERR, "I/O error on journal device");
goto out_journal;
}