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 <huangxiaoj...@huawei.com> --- v3: fix commit message, overly long line and an else branch. For bdev, it's tested as following: mkfs.erofs test.img <SOURCES> mount -t erofs test.img <mntdir> ioctl_getfssysfspath <mntdir> erofs/<dev> will be outputted. For fscache, it's tested via https://github.com/lostjeffle/demand-read-cachefilesd.git ./run.sh inputdir mntdir fscachedir ioctl_getfssysfspath mntdir erofs/[domain_id,]<fs_id> will be outputted v2: handle non-bdev case. https://lore.kernel.org/all/20240716112939.2355999-1-huangxiaoj...@huawei.com/ v1: https://lore.kernel.org/all/20240624063801.2476116-1-huangxiaoj...@huawei.com/ --- fs/erofs/super.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 1b91d9513013..d7900262aa75 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -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); -- 2.34.1
