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erofs: use dsb instead of layout for ondisk super_block

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As Christoph pointed out [1], "Why is the variable name
for the on-disk subperblock layout? We usually still
calls this something with sb in the name, e.g. dsb.
for disksuper block. " Let's fix it.

[1] https://lore.kernel.org/r/20190829101545.GC20598@infradead.org/
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-14-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-09-04 10:09:00 +08:00 committed by Greg Kroah-Hartman
parent a2c75c8143
commit 0259f20948
1 changed files with 17 additions and 18 deletions
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35
fs/erofs/super.c
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@ -49,9 +49,9 @@ static void free_inode(struct inode *inode)
}
static bool check_layout_compatibility(struct super_block *sb,
struct erofs_super_block *layout)
struct erofs_super_block *dsb)
{
const unsigned int feature = le32_to_cpu(layout->feature_incompat);
const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
EROFS_SB(sb)->feature_incompat = feature;
@ -68,7 +68,7 @@ static int superblock_read(struct super_block *sb)
{
struct erofs_sb_info *sbi;
struct buffer_head *bh;
struct erofs_super_block *layout;
struct erofs_super_block *dsb;
unsigned int blkszbits;
int ret;
@ -80,16 +80,15 @@ static int superblock_read(struct super_block *sb)
}
sbi = EROFS_SB(sb);
layout = (struct erofs_super_block *)((u8 *)bh->b_data
+ EROFS_SUPER_OFFSET);
dsb = (struct erofs_super_block *)(bh->b_data + EROFS_SUPER_OFFSET);
ret = -EINVAL;
if (le32_to_cpu(layout->magic) != EROFS_SUPER_MAGIC_V1) {
if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
errln("cannot find valid erofs superblock");
goto out;
}
blkszbits = layout->blkszbits;
blkszbits = dsb->blkszbits;
/* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
if (blkszbits != LOG_BLOCK_SIZE) {
errln("blksize %u isn't supported on this platform",
@ -97,25 +96,25 @@ static int superblock_read(struct super_block *sb)
goto out;
}
if (!check_layout_compatibility(sb, layout))
if (!check_layout_compatibility(sb, dsb))
goto out;
sbi->blocks = le32_to_cpu(layout->blocks);
sbi->meta_blkaddr = le32_to_cpu(layout->meta_blkaddr);
sbi->blocks = le32_to_cpu(dsb->blocks);
sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
#ifdef CONFIG_EROFS_FS_XATTR
sbi->xattr_blkaddr = le32_to_cpu(layout->xattr_blkaddr);
sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
#endif
sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
sbi->root_nid = le16_to_cpu(layout->root_nid);
sbi->inos = le64_to_cpu(layout->inos);
sbi->root_nid = le16_to_cpu(dsb->root_nid);
sbi->inos = le64_to_cpu(dsb->inos);
sbi->build_time = le64_to_cpu(layout->build_time);
sbi->build_time_nsec = le32_to_cpu(layout->build_time_nsec);
sbi->build_time = le64_to_cpu(dsb->build_time);
sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
memcpy(&sb->s_uuid, layout->uuid, sizeof(layout->uuid));
memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
ret = strscpy(sbi->volume_name, layout->volume_name,
sizeof(layout->volume_name));
ret = strscpy(sbi->volume_name, dsb->volume_name,
sizeof(dsb->volume_name));
if (ret < 0) { /* -E2BIG */
errln("bad volume name without NIL terminator");
ret = -EFSCORRUPTED;