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f2fs: support idmapped mounts

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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>
This commit is contained in:
Chao Yu 2022-02-04 13:24:56 +08:00 committed by Jaegeuk Kim
parent 47c8ebcce8
commit 984fc4e76d
4 changed files with 50 additions and 37 deletions
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21
fs/f2fs/acl.c
View File

@ -204,8 +204,9 @@ struct posix_acl *f2fs_get_acl(struct inode *inode, int type, bool rcu)
return __f2fs_get_acl(inode, type, NULL);
}
static int f2fs_acl_update_mode(struct inode *inode, umode_t *mode_p,
struct posix_acl **acl)
static int f2fs_acl_update_mode(struct user_namespace *mnt_userns,
struct inode *inode, umode_t *mode_p,
struct posix_acl **acl)
{
umode_t mode = inode->i_mode;
int error;
@ -218,14 +219,15 @@ static int f2fs_acl_update_mode(struct inode *inode, umode_t *mode_p,
return error;
if (error == 0)
*acl = NULL;
if (!in_group_p(i_gid_into_mnt(&init_user_ns, inode)) &&
!capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
if (!in_group_p(i_gid_into_mnt(mnt_userns, inode)) &&
!capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
mode &= ~S_ISGID;
*mode_p = mode;
return 0;
}
static int __f2fs_set_acl(struct inode *inode, int type,
static int __f2fs_set_acl(struct user_namespace *mnt_userns,
struct inode *inode, int type,
struct posix_acl *acl, struct page *ipage)
{
int name_index;
@ -238,7 +240,8 @@ static int __f2fs_set_acl(struct inode *inode, int type,
case ACL_TYPE_ACCESS:
name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
if (acl && !ipage) {
error = f2fs_acl_update_mode(inode, &mode, &acl);
error = f2fs_acl_update_mode(mnt_userns, inode,
&mode, &acl);
if (error)
return error;
set_acl_inode(inode, mode);
@ -279,7 +282,7 @@ int f2fs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
return -EIO;
return __f2fs_set_acl(inode, type, acl, NULL);
return __f2fs_set_acl(mnt_userns, inode, type, acl, NULL);
}
/*
@ -419,7 +422,7 @@ int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
f2fs_mark_inode_dirty_sync(inode, true);
if (default_acl) {
error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl,
error = __f2fs_set_acl(NULL, inode, ACL_TYPE_DEFAULT, default_acl,
ipage);
posix_acl_release(default_acl);
} else {
@ -427,7 +430,7 @@ int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
}
if (acl) {
if (!error)
error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl,
error = __f2fs_set_acl(NULL, inode, ACL_TYPE_ACCESS, acl,
ipage);
posix_acl_release(acl);
} else {

23
fs/f2fs/file.c
View File

@ -844,7 +844,7 @@ int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
STATX_ATTR_NODUMP |
STATX_ATTR_VERITY);
generic_fillattr(&init_user_ns, inode, stat);
generic_fillattr(mnt_userns, inode, stat);
/* we need to show initial sectors used for inline_data/dentries */
if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
@ -904,7 +904,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
!f2fs_is_compress_backend_ready(inode))
return -EOPNOTSUPP;
err = setattr_prepare(&init_user_ns, dentry, attr);
err = setattr_prepare(mnt_userns, dentry, attr);
if (err)
return err;
@ -980,10 +980,10 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
spin_unlock(&F2FS_I(inode)->i_size_lock);
}
__setattr_copy(&init_user_ns, inode, attr);
__setattr_copy(mnt_userns, inode, attr);
if (attr->ia_valid & ATTR_MODE) {
err = posix_acl_chmod(&init_user_ns, inode, f2fs_get_inode_mode(inode));
err = posix_acl_chmod(mnt_userns, inode, f2fs_get_inode_mode(inode));
if (is_inode_flag_set(inode, FI_ACL_MODE)) {
if (!err)
@ -1989,11 +1989,12 @@ static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
static int f2fs_ioc_start_atomic_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
int ret;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@ -2058,9 +2059,10 @@ out:
static int f2fs_ioc_commit_atomic_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
int ret;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@ -2100,9 +2102,10 @@ err_out:
static int f2fs_ioc_start_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
int ret;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@ -2135,9 +2138,10 @@ out:
static int f2fs_ioc_release_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
int ret;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@ -2164,9 +2168,10 @@ out:
static int f2fs_ioc_abort_volatile_write(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
int ret;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);

41
fs/f2fs/namei.c
View File

@ -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 @@ out:
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,

2
fs/f2fs/super.c
View File

@ -4539,7 +4539,7 @@ static struct file_system_type f2fs_fs_type = {
.name = "f2fs",
.mount = f2fs_mount,
.kill_sb = kill_f2fs_super,
.fs_flags = FS_REQUIRES_DEV,
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
};
MODULE_ALIAS_FS("f2fs");