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erofs: add support for FS_IOC_GETFSSYSFSPATH

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FS_IOC_GETFSSYSFSPATH ioctl exposes /sys/fs path of a given filesystem,
potentially standarizing sysfs reporting. This patch add support for
FS_IOC_GETFSSYSFSPATH for erofs, "erofs/<dev>" will be outputted for bdev
cases, "erofs/[domain_id,]<fs_id>" will be outputted for fscache cases.

Signed-off-by: Huang Xiaojia <huangxiaojia2@huawei.com>
Link: https://lore.kernel.org/r/20240720082335.441563-1-huangxiaojia2@huawei.com
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Huang Xiaojia 2024-07-20 16:23:35 +08:00 committed by Gao Xiang
parent 7dc5537c3f
commit 684b290abc
1 changed files with 16 additions and 0 deletions
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16
fs/erofs/super.c
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@ -576,6 +576,21 @@ 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_fscache_mode(sb)) {
if (sbi->domain_id)
super_set_sysfs_name_generic(sb, "%s,%s",sbi->domain_id,
sbi->fsid);
else
super_set_sysfs_name_generic(sb, "%s", sbi->fsid);
return;
}
super_set_sysfs_name_id(sb);
}
static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
@ -643,6 +658,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_flags |= SB_POSIXACL;
else
sb->s_flags &= ~SB_POSIXACL;
erofs_set_sysfs_name(sb);
#ifdef CONFIG_EROFS_FS_ZIP
xa_init(&sbi->managed_pslots);