f2fs: support idmapped mounts
This patch enables idmapped mounts for f2fs, 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 f2fs image:
1. truncate -s 128M f2fs.img
2. mkfs.f2fs f2fs.img
3. mount f2fs.img /mnt/f2fs/
4. touch /mnt/f2fs/file
5. ls -ln /mnt/f2fs/
total 0
-rw-r--r-- 1 0 0 0 2月 4 13:17 file
6. ./mount-idmapped --map-mount b:0:1001:1 /mnt/f2fs/ /mnt/scratch_f2fs/
7. ls -ln /mnt/scratch_f2fs/
total 0
-rw-r--r-- 1 1001 1001 0 2月 4 13:17 file
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 0347c57..2b23a76 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -22,7 +22,8 @@
#include "acl.h"
#include <trace/events/f2fs.h>
-static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
+static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
+ struct inode *dir, umode_t mode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
nid_t ino;
@@ -46,7 +47,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
nid_free = true;
- inode_init_owner(&init_user_ns, inode, dir, mode);
+ inode_init_owner(mnt_userns, inode, dir, mode);
inode->i_ino = ino;
inode->i_blocks = 0;
@@ -67,7 +68,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
(F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
else
- F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
+ F2FS_I(inode)->i_projid = make_kprojid(mnt_userns,
F2FS_DEF_PROJID);
err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
@@ -349,7 +350,7 @@ static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
if (err)
return err;
- inode = f2fs_new_inode(dir, mode);
+ inode = f2fs_new_inode(mnt_userns, dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -679,7 +680,7 @@ static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
if (err)
return err;
- inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
+ inode = f2fs_new_inode(mnt_userns, dir, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -750,7 +751,7 @@ static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
if (err)
return err;
- inode = f2fs_new_inode(dir, S_IFDIR | mode);
+ inode = f2fs_new_inode(mnt_userns, dir, S_IFDIR | mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -807,7 +808,7 @@ static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
if (err)
return err;
- inode = f2fs_new_inode(dir, mode);
+ inode = f2fs_new_inode(mnt_userns, dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -834,8 +835,9 @@ static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
return err;
}
-static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
- umode_t mode, struct inode **whiteout)
+static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode,
+ struct inode **whiteout)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode;
@@ -845,7 +847,7 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
if (err)
return err;
- inode = f2fs_new_inode(dir, mode);
+ inode = f2fs_new_inode(mnt_userns, dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -909,20 +911,22 @@ static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
if (!f2fs_is_checkpoint_ready(sbi))
return -ENOSPC;
- return __f2fs_tmpfile(dir, dentry, mode, NULL);
+ return __f2fs_tmpfile(mnt_userns, dir, dentry, mode, NULL);
}
-static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
+static int f2fs_create_whiteout(struct user_namespace *mnt_userns,
+ struct inode *dir, struct inode **whiteout)
{
if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
return -EIO;
- return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
+ return __f2fs_tmpfile(mnt_userns, dir, NULL,
+ S_IFCHR | WHITEOUT_MODE, whiteout);
}
-static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- unsigned int flags)
+static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+ struct dentry *old_dentry, struct inode *new_dir,
+ struct dentry *new_dentry, unsigned int flags)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
struct inode *old_inode = d_inode(old_dentry);
@@ -960,7 +964,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
}
if (flags & RENAME_WHITEOUT) {
- err = f2fs_create_whiteout(old_dir, &whiteout);
+ err = f2fs_create_whiteout(mnt_userns, old_dir, &whiteout);
if (err)
return err;
}
@@ -1300,7 +1304,8 @@ static int f2fs_rename2(struct user_namespace *mnt_userns,
* VFS has already handled the new dentry existence case,
* here, we just deal with "RENAME_NOREPLACE" as regular rename.
*/
- return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
+ return f2fs_rename(mnt_userns, old_dir, old_dentry,
+ new_dir, new_dentry, flags);
}
static const char *f2fs_encrypted_get_link(struct dentry *dentry,
