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ext4: introduce ext4_sb_bread_unmovable() to replace sb_bread_unmovable()

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Now we only use sb_bread_unmovable() to read superblock and descriptor
block at mount time, so there is no opportunity that we need to clear
buffer verified bit and also handle buffer write_io error bit. But for
the sake of unification, let's introduce ext4_sb_bread_unmovable() to
replace all sb_bread_unmovable(). After this patch, we stop using read
helpers in fs/buffer.c.

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Link: https://lore.kernel.org/r/20200924073337.861472-8-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
zhangyi (F) 2020-09-24 15:33:37 +08:00 committed by Theodore Ts'o
parent 0a846f496d
commit 8394a6abf3
2 changed files with 31 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ext4/ext4.h
View File

@ -2823,6 +2823,8 @@ extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
/* super.c */
extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
sector_t block, int op_flags);
extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
sector_t block);
extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
bh_end_io_t *end_io);
extern int ext4_read_bh(struct buffer_head *bh, int op_flags,

38
fs/ext4/super.c
View File

@ -204,18 +204,19 @@ int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
}
/*
* This works like sb_bread() except it uses ERR_PTR for error
* This works like __bread_gfp() except it uses ERR_PTR for error
* returns. Currently with sb_bread it's impossible to distinguish
* between ENOMEM and EIO situations (since both result in a NULL
* return.
*/
struct buffer_head *
ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
sector_t block, int op_flags,
gfp_t gfp)
{
struct buffer_head *bh;
int ret;
bh = sb_getblk(sb, block);
bh = sb_getblk_gfp(sb, block, gfp);
if (bh == NULL)
return ERR_PTR(-ENOMEM);
if (ext4_buffer_uptodate(bh))
@ -229,6 +230,18 @@ ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
return bh;
}
struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
int op_flags)
{
return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
}
struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
sector_t block)
{
return __ext4_sb_bread_gfp(sb, block, 0, 0);
}
void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
{
struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
@ -3954,8 +3967,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
logical_sb_block = sb_block;
}
if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
if (IS_ERR(bh)) {
ext4_msg(sb, KERN_ERR, "unable to read superblock");
ret = PTR_ERR(bh);
bh = NULL;
goto out_fail;
}
/*
@ -4351,10 +4367,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
brelse(bh);
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
offset = do_div(logical_sb_block, blocksize);
bh = sb_bread_unmovable(sb, logical_sb_block);
if (!bh) {
bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
if (IS_ERR(bh)) {
ext4_msg(sb, KERN_ERR,
"Can't read superblock on 2nd try");
ret = PTR_ERR(bh);
bh = NULL;
goto failed_mount;
}
es = (struct ext4_super_block *)(bh->b_data + offset);
@ -4573,11 +4591,13 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
struct buffer_head *bh;
block = descriptor_loc(sb, logical_sb_block, i);
bh = sb_bread_unmovable(sb, block);
if (!bh) {
bh = ext4_sb_bread_unmovable(sb, block);
if (IS_ERR(bh)) {
ext4_msg(sb, KERN_ERR,
"can't read group descriptor %d", i);
db_count = i;
ret = PTR_ERR(bh);
bh = NULL;
goto failed_mount2;
}
rcu_read_lock();