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ext4: convert to fileattr

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Use the fileattr API to let the VFS handle locking, permission checking and
conversion.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Miklos Szeredi 2021-04-07 14:36:43 +02:00
parent aba405e33e
commit 4db5c2e623
4 changed files with 50 additions and 174 deletions
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12
fs/ext4/ext4.h
View File

@ -472,15 +472,6 @@ struct flex_groups {
EXT4_VERITY_FL | \
EXT4_INLINE_DATA_FL)
/* Flags we can manipulate with through FS_IOC_FSSETXATTR */
#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
EXT4_IMMUTABLE_FL | \
EXT4_APPEND_FL | \
EXT4_NODUMP_FL | \
EXT4_NOATIME_FL | \
EXT4_PROJINHERIT_FL | \
EXT4_DAX_FL)
/* Flags that should be inherited by new inodes from their parent. */
#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
@ -2928,6 +2919,9 @@ extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
int ext4_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa);
int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern void ext4_reset_inode_seed(struct inode *inode);
/* migrate.c */

2
fs/ext4/file.c
View File

@ -919,5 +919,7 @@ const struct inode_operations ext4_file_inode_operations = {
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
.fiemap = ext4_fiemap,
.fileattr_get = ext4_fileattr_get,
.fileattr_set = ext4_fileattr_set,
};

208
fs/ext4/ioctl.c
View File

@ -20,6 +20,7 @@
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/iversion.h>
#include <linux/fileattr.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include <linux/fsmap.h>
@ -344,11 +345,6 @@ static int ext4_ioctl_setflags(struct inode *inode,
goto flags_out;
oldflags = ei->i_flags;
err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
if (err)
goto flags_out;
/*
* The JOURNAL_DATA flag can only be changed by
* the relevant capability.
@ -459,9 +455,8 @@ flags_out:
}
#ifdef CONFIG_QUOTA
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
{
struct inode *inode = file_inode(filp);
struct super_block *sb = inode->i_sb;
struct ext4_inode_info *ei = EXT4_I(inode);
int err, rc;
@ -545,7 +540,7 @@ out_stop:
return err;
}
#else
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
{
if (projid != EXT4_DEF_PROJID)
return -EOPNOTSUPP;
@ -553,56 +548,6 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
}
#endif
/* Transfer internal flags to xflags */
static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
{
__u32 xflags = 0;
if (iflags & EXT4_SYNC_FL)
xflags |= FS_XFLAG_SYNC;
if (iflags & EXT4_IMMUTABLE_FL)
xflags |= FS_XFLAG_IMMUTABLE;
if (iflags & EXT4_APPEND_FL)
xflags |= FS_XFLAG_APPEND;
if (iflags & EXT4_NODUMP_FL)
xflags |= FS_XFLAG_NODUMP;
if (iflags & EXT4_NOATIME_FL)
xflags |= FS_XFLAG_NOATIME;
if (iflags & EXT4_PROJINHERIT_FL)
xflags |= FS_XFLAG_PROJINHERIT;
if (iflags & EXT4_DAX_FL)
xflags |= FS_XFLAG_DAX;
return xflags;
}
#define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT | \
FS_XFLAG_DAX)
/* Transfer xflags flags to internal */
static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
{
unsigned long iflags = 0;
if (xflags & FS_XFLAG_SYNC)
iflags |= EXT4_SYNC_FL;
if (xflags & FS_XFLAG_IMMUTABLE)
iflags |= EXT4_IMMUTABLE_FL;
if (xflags & FS_XFLAG_APPEND)
iflags |= EXT4_APPEND_FL;
if (xflags & FS_XFLAG_NODUMP)
iflags |= EXT4_NODUMP_FL;
if (xflags & FS_XFLAG_NOATIME)
iflags |= EXT4_NOATIME_FL;
if (xflags & FS_XFLAG_PROJINHERIT)
iflags |= EXT4_PROJINHERIT_FL;
if (xflags & FS_XFLAG_DAX)
iflags |= EXT4_DAX_FL;
return iflags;
}
static int ext4_shutdown(struct super_block *sb, unsigned long arg)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -770,15 +715,52 @@ group_add_out:
return err;
}
static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
struct ext4_inode_info *ei = EXT4_I(inode);
u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
EXT4_FL_USER_VISIBLE));
if (S_ISREG(inode->i_mode))
flags &= ~FS_PROJINHERIT_FL;
fileattr_fill_flags(fa, flags);
if (ext4_has_feature_project(inode->i_sb))
fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
return 0;
}
int ext4_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
u32 flags = fa->flags;
int err = -EOPNOTSUPP;
ext4_fc_start_update(inode);
if (flags & ~EXT4_FL_USER_VISIBLE)
goto out;
/*
* chattr(1) grabs flags via GETFLAGS, modifies the result and
* passes that to SETFLAGS. So we cannot easily make SETFLAGS
* more restrictive than just silently masking off visible but
* not settable flags as we always did.
*/
flags &= EXT4_FL_USER_MODIFIABLE;
if (ext4_mask_flags(inode->i_mode, flags) != flags)
goto out;
err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
if (err)
goto out;
err = ext4_ioctl_setflags(inode, flags);
if (err)
goto out;
err = ext4_ioctl_setproject(inode, fa->fsx_projid);
out:
ext4_fc_stop_update(inode);
return err;
}
/* So that the fiemap access checks can't overflow on 32 bit machines. */
@ -816,55 +798,13 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
struct super_block *sb = inode->i_sb;
struct ext4_inode_info *ei = EXT4_I(inode);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
unsigned int flags;
ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
switch (cmd) {
case FS_IOC_GETFSMAP:
return ext4_ioc_getfsmap(sb, (void __user *)arg);
case FS_IOC_GETFLAGS:
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
if (S_ISREG(inode->i_mode))
flags &= ~EXT4_PROJINHERIT_FL;
return put_user(flags, (int __user *) arg);
case FS_IOC_SETFLAGS: {
int err;
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
return -EFAULT;
if (flags & ~EXT4_FL_USER_VISIBLE)
return -EOPNOTSUPP;
/*
* chattr(1) grabs flags via GETFLAGS, modifies the result and
* passes that to SETFLAGS. So we cannot easily make SETFLAGS
* more restrictive than just silently masking off visible but
* not settable flags as we always did.
*/
flags &= EXT4_FL_USER_MODIFIABLE;
if (ext4_mask_flags(inode->i_mode, flags) != flags)
return -EOPNOTSUPP;
err = mnt_want_write_file(filp);
if (err)
return err;
inode_lock(inode);
err = ext4_ioctl_check_immutable(inode,
from_kprojid(&init_user_ns, ei->i_projid),
flags);
if (!err)
err = ext4_ioctl_setflags(inode, flags);
inode_unlock(inode);
mnt_drop_write_file(filp);
return err;
}
case EXT4_IOC_GETVERSION:
case EXT4_IOC_GETVERSION_OLD:
return put_user(inode->i_generation, (int __user *) arg);
@ -1246,60 +1186,6 @@ resizefs_out:
case EXT4_IOC_GET_ES_CACHE:
return ext4_ioctl_get_es_cache(filp, arg);
case FS_IOC_FSGETXATTR:
{
struct fsxattr fa;
ext4_fill_fsxattr(inode, &fa);
if (copy_to_user((struct fsxattr __user *)arg,
&fa, sizeof(fa)))
return -EFAULT;
return 0;
}
case FS_IOC_FSSETXATTR:
{
struct fsxattr fa, old_fa;
int err;
if (copy_from_user(&fa, (struct fsxattr __user *)arg,
sizeof(fa)))
return -EFAULT;
/* Make sure caller has proper permission */
if (!inode_owner_or_capable(mnt_userns, inode))
return -EACCES;
if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
return -EOPNOTSUPP;
flags = ext4_xflags_to_iflags(fa.fsx_xflags);
if (ext4_mask_flags(inode->i_mode, flags) != flags)
return -EOPNOTSUPP;
err = mnt_want_write_file(filp);
if (err)
return err;
inode_lock(inode);
ext4_fill_fsxattr(inode, &old_fa);
err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
if (err)
goto out;
flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
(flags & EXT4_FL_XFLAG_VISIBLE);
err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
if (err)
goto out;
err = ext4_ioctl_setflags(inode, flags);
if (err)
goto out;
err = ext4_ioctl_setproject(filp, fa.fsx_projid);
out:
inode_unlock(inode);
mnt_drop_write_file(filp);
return err;
}
case EXT4_IOC_SHUTDOWN:
return ext4_shutdown(sb, arg);
@ -1340,12 +1226,6 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
/* These are just misnamed, they actually get/put from/to user an int */
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;
case FS_IOC32_SETFLAGS:
cmd = FS_IOC_SETFLAGS;
break;
case EXT4_IOC32_GETVERSION:
cmd = EXT4_IOC_GETVERSION;
break;
@ -1405,8 +1285,6 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_CLEAR_ES_CACHE:
case EXT4_IOC_GETSTATE:
case EXT4_IOC_GET_ES_CACHE:
case FS_IOC_FSGETXATTR:
case FS_IOC_FSSETXATTR:
break;
default:
return -ENOIOCTLCMD;

2
fs/ext4/namei.c
View File

@ -4172,6 +4172,8 @@ const struct inode_operations ext4_dir_inode_operations = {
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
.fiemap = ext4_fiemap,
.fileattr_get = ext4_fileattr_get,
.fileattr_set = ext4_fileattr_set,
};
const struct inode_operations ext4_special_inode_operations = {