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erofs: use meta buffers for erofs_read_superblock()

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The only change is that, meta buffers read cache page without __GFP_FS
flag, which shall not matter.

Link: https://lore.kernel.org/r/20220209060108.43051-7-jefflexu@linux.alibaba.com
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jeffle Xu 2022-02-09 14:00:52 +08:00 committed by Gao Xiang
parent ffb217a13a
commit ed6e0401e6
1 changed files with 5 additions and 8 deletions
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13
fs/erofs/super.c
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@ -281,21 +281,19 @@ static int erofs_init_devices(struct super_block *sb,
static int erofs_read_superblock(struct super_block *sb)
{
struct erofs_sb_info *sbi;
struct page *page;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
struct erofs_super_block *dsb;
unsigned int blkszbits;
void *data;
int ret;
page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
if (IS_ERR(page)) {
data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP);
if (IS_ERR(data)) {
erofs_err(sb, "cannot read erofs superblock");
return PTR_ERR(page);
return PTR_ERR(data);
}
sbi = EROFS_SB(sb);
data = kmap(page);
dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
ret = -EINVAL;
@ -365,8 +363,7 @@ static int erofs_read_superblock(struct super_block *sb)
if (erofs_sb_has_ztailpacking(sbi))
erofs_info(sb, "EXPERIMENTAL compressed inline data feature in use. Use at your own risk!");
out:
kunmap(page);
put_page(page);
erofs_put_metabuf(&buf);
return ret;
}