diff options
| author | Chao Yu | 2022-05-17 18:41:03 +0800 |
|---|---|---|
| committer | Gao Xiang | 2022-05-17 23:56:20 +0800 |
| commit | 6c459b78d4793afbba6d864c466cc5cd2932459d (patch) | |
| tree | 198e4f7b5ac58d04e18306d38621e2c793b394ca /fs/erofs | |
| parent | 3e917cc305c6df350af5ad5c40d56e3e48b42281 (diff) | |
erofs: support idmapped mounts
This patch enables idmapped mounts for erofs, since all dedicated helpers
for this functionality existsm, so, in this patch we just pass down the
user_namespace argument from the VFS methods to the relevant helpers.
Simple idmap example on erofs image:
1. mkdir dir
2. touch dir/file
3. mkfs.erofs erofs.img dir
4. mount -t erofs -o loop erofs.img /mnt/erofs/
5. ls -ln /mnt/erofs/
total 0
-rw-rw-r-- 1 1000 1000 0 May 17 15:26 file
6. mount-idmapped --map-mount b:1000:1001:1 /mnt/erofs/ /mnt/scratch_erofs/
7. ls -ln /mnt/scratch_erofs/
total 0
-rw-rw-r-- 1 1001 1001 0 May 17 15:26 file
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Chao Yu <chao.yu@oppo.com>
Link: https://lore.kernel.org/r/20220517104103.3570721-1-chao@kernel.org
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs')
| -rw-r--r-- | fs/erofs/inode.c | 2 | ||||
| -rw-r--r-- | fs/erofs/super.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 4b2b1f357972..6c28ed75dc82 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -365,7 +365,7 @@ int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_IMMUTABLE); - generic_fillattr(&init_user_ns, inode, stat); + generic_fillattr(mnt_userns, inode, stat); return 0; } diff --git a/fs/erofs/super.c b/fs/erofs/super.c index dbfe2cbbb00e..a326445af7d0 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -821,7 +821,7 @@ static struct file_system_type erofs_fs_type = { .name = "erofs", .init_fs_context = erofs_init_fs_context, .kill_sb = erofs_kill_sb, - .fs_flags = FS_REQUIRES_DEV, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, }; MODULE_ALIAS_FS("erofs"); |