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erofs: use more informative s_id for file-backed mounts

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For file-backed mounts, set sb->s_id to the MAJOR:MINOR of sb->s_dev
(which fstat() will return) so that kernel messages and the sysfs
name are more informative rather than just "erofs: (device erofs): ...".

Reviewed-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang
2026-06-30 11:18:13 +08:00
parent dc59e4fea9
commit 1006b2f57f
1 changed files with 4 additions and 13 deletions
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17
fs/erofs/super.c
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@@ -595,17 +595,6 @@ static const struct export_operations erofs_export_ops = {
.get_parent = erofs_get_parent,
};
static void erofs_set_sysfs_name(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
if (erofs_is_fileio_mode(sbi))
super_set_sysfs_name_generic(sb, "%s",
bdi_dev_name(sb->s_bdi));
else
super_set_sysfs_name_id(sb);
}
static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
@@ -657,12 +646,14 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
err = super_setup_bdi(sb);
if (err)
return err;
snprintf(sb->s_id, sizeof(sb->s_id),
"%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
} else {
if (!sb_set_blocksize(sb, PAGE_SIZE)) {
errorfc(fc, "failed to set initial blksize");
return -EINVAL;
}
sbi->dif0.dax_dev = fs_dax_get_by_bdev(sb->s_bdev,
&sbi->dif0.dax_part_off, NULL, NULL);
}
@@ -740,7 +731,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
erofs_set_sysfs_name(sb);
super_set_sysfs_name_id(sb);
err = erofs_register_sysfs(sb);
if (err)
return err;