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btrfs: convert to fileattr 

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

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: David Sterba <dsterba@suse.com>
This commit is contained in:
Miklos Szeredi 2021-04-07 14:36:43 +02:00
parent 66dbfabf10
commit 97fc297754
3 changed files with 42 additions and 193 deletions
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3
fs/btrfs/ctree.h
View File

@ -3189,6 +3189,9 @@ void btrfs_update_inode_bytes(struct btrfs_inode *inode,
/* ioctl.c */
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int btrfs_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa);
int btrfs_ioctl_get_supported_features(void __user *arg);
void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
int __pure btrfs_is_empty_uuid(u8 *uuid);

4
fs/btrfs/inode.c
View File

@ -10603,6 +10603,8 @@ static const struct inode_operations btrfs_dir_inode_operations = {
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
.tmpfile = btrfs_tmpfile,
.fileattr_get = btrfs_fileattr_get,
.fileattr_set = btrfs_fileattr_set,
};
static const struct file_operations btrfs_dir_file_operations = {
@ -10656,6 +10658,8 @@ static const struct inode_operations btrfs_file_inode_operations = {
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
.fileattr_get = btrfs_fileattr_get,
.fileattr_set = btrfs_fileattr_set,
};
static const struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,

228
fs/btrfs/ioctl.c
View File

@ -26,6 +26,7 @@
#include <linux/btrfs.h>
#include <linux/uaccess.h>
#include <linux/iversion.h>
#include <linux/fileattr.h>
#include "ctree.h"
#include "disk-io.h"
#include "export.h"
@ -153,16 +154,6 @@ void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
new_fl);
}
static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
{
struct btrfs_inode *binode = BTRFS_I(file_inode(file));
unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
if (copy_to_user(arg, &flags, sizeof(flags)))
return -EFAULT;
return 0;
}
/*
* Check if @flags are a supported and valid set of FS_*_FL flags and that
* the old and new flags are not conflicting
@ -201,9 +192,22 @@ static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
return 0;
}
static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
/*
* Set flags/xflags from the internal inode flags. The remaining items of
* fsxattr are zeroed.
*/
int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = file_inode(file);
struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode->flags));
return 0;
}
int btrfs_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_inode *binode = BTRFS_I(inode);
struct btrfs_root *root = binode->root;
@ -213,34 +217,21 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
const char *comp = NULL;
u32 binode_flags;
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (btrfs_root_readonly(root))
return -EROFS;
if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
return -EFAULT;
if (fileattr_has_fsx(fa))
return -EOPNOTSUPP;
ret = mnt_want_write_file(file);
fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
ret = check_fsflags(old_fsflags, fsflags);
if (ret)
return ret;
inode_lock(inode);
fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
if (ret)
goto out_unlock;
ret = check_fsflags(old_fsflags, fsflags);
if (ret)
goto out_unlock;
ret = check_fsflags_compatible(fs_info, fsflags);
if (ret)
goto out_unlock;
return ret;
binode_flags = binode->flags;
if (fsflags & FS_SYNC_FL)
@ -263,6 +254,14 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
binode_flags |= BTRFS_INODE_NOATIME;
else
binode_flags &= ~BTRFS_INODE_NOATIME;
/* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
if (!fa->flags_valid) {
/* 1 item for the inode */
trans = btrfs_start_transaction(root, 1);
goto update_flags;
}
if (fsflags & FS_DIRSYNC_FL)
binode_flags |= BTRFS_INODE_DIRSYNC;
else
@ -303,10 +302,8 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
binode_flags |= BTRFS_INODE_NOCOMPRESS;
} else if (fsflags & FS_COMPR_FL) {
if (IS_SWAPFILE(inode)) {
ret = -ETXTBSY;
goto out_unlock;
}
if (IS_SWAPFILE(inode))
return -ETXTBSY;
binode_flags |= BTRFS_INODE_COMPRESS;
binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
@ -323,10 +320,8 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
* 2 for properties
*/
trans = btrfs_start_transaction(root, 3);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_unlock;
}
if (IS_ERR(trans))
return PTR_ERR(trans);
if (comp) {
ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
@ -344,6 +339,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
}
}
update_flags:
binode->flags = binode_flags;
btrfs_sync_inode_flags_to_i_flags(inode);
inode_inc_iversion(inode);
@ -352,44 +348,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
out_end_trans:
btrfs_end_transaction(trans);
out_unlock:
inode_unlock(inode);
mnt_drop_write_file(file);
return ret;
}
/*
* Translate btrfs internal inode flags to xflags as expected by the
* FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
* silently dropped.
*/
static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
{
unsigned int xflags = 0;
if (flags & BTRFS_INODE_APPEND)
xflags |= FS_XFLAG_APPEND;
if (flags & BTRFS_INODE_IMMUTABLE)
xflags |= FS_XFLAG_IMMUTABLE;
if (flags & BTRFS_INODE_NOATIME)
xflags |= FS_XFLAG_NOATIME;
if (flags & BTRFS_INODE_NODUMP)
xflags |= FS_XFLAG_NODUMP;
if (flags & BTRFS_INODE_SYNC)
xflags |= FS_XFLAG_SYNC;
return xflags;
}
/* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
static int check_xflags(unsigned int flags)
{
if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
return -EOPNOTSUPP;
return 0;
}
bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
enum btrfs_exclusive_operation type)
{
@ -402,111 +363,6 @@ void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
}
/*
* Set the xflags from the internal inode flags. The remaining items of fsxattr
* are zeroed.
*/
static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
{
struct btrfs_inode *binode = BTRFS_I(file_inode(file));
struct fsxattr fa;
simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags));
if (copy_to_user(arg, &fa, sizeof(fa)))
return -EFAULT;
return 0;
}
static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
struct btrfs_inode *binode = BTRFS_I(inode);
struct btrfs_root *root = binode->root;
struct btrfs_trans_handle *trans;
struct fsxattr fa, old_fa;
unsigned old_flags;
unsigned old_i_flags;
int ret = 0;
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (btrfs_root_readonly(root))
return -EROFS;
if (copy_from_user(&fa, arg, sizeof(fa)))
return -EFAULT;
ret = check_xflags(fa.fsx_xflags);
if (ret)
return ret;
if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
return -EOPNOTSUPP;
ret = mnt_want_write_file(file);
if (ret)
return ret;
inode_lock(inode);
old_flags = binode->flags;
old_i_flags = inode->i_flags;
simple_fill_fsxattr(&old_fa,
btrfs_inode_flags_to_xflags(binode->flags));
ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
if (ret)
goto out_unlock;
if (fa.fsx_xflags & FS_XFLAG_SYNC)
binode->flags |= BTRFS_INODE_SYNC;
else
binode->flags &= ~BTRFS_INODE_SYNC;
if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
binode->flags |= BTRFS_INODE_IMMUTABLE;
else
binode->flags &= ~BTRFS_INODE_IMMUTABLE;
if (fa.fsx_xflags & FS_XFLAG_APPEND)
binode->flags |= BTRFS_INODE_APPEND;
else
binode->flags &= ~BTRFS_INODE_APPEND;
if (fa.fsx_xflags & FS_XFLAG_NODUMP)
binode->flags |= BTRFS_INODE_NODUMP;
else
binode->flags &= ~BTRFS_INODE_NODUMP;
if (fa.fsx_xflags & FS_XFLAG_NOATIME)
binode->flags |= BTRFS_INODE_NOATIME;
else
binode->flags &= ~BTRFS_INODE_NOATIME;
/* 1 item for the inode */
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_unlock;
}
btrfs_sync_inode_flags_to_i_flags(inode);
inode_inc_iversion(inode);
inode->i_ctime = current_time(inode);
ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
btrfs_end_transaction(trans);
out_unlock:
if (ret) {
binode->flags = old_flags;
inode->i_flags = old_i_flags;
}
inode_unlock(inode);
mnt_drop_write_file(file);
return ret;
}
static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
{
struct inode *inode = file_inode(file);
@ -4915,10 +4771,6 @@ long btrfs_ioctl(struct file *file, unsigned int
void __user *argp = (void __user *)arg;
switch (cmd) {
case FS_IOC_GETFLAGS:
return btrfs_ioctl_getflags(file, argp);
case FS_IOC_SETFLAGS:
return btrfs_ioctl_setflags(file, argp);
case FS_IOC_GETVERSION:
return btrfs_ioctl_getversion(file, argp);
case FS_IOC_GETFSLABEL:
@ -5044,10 +4896,6 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_get_features(fs_info, argp);
case BTRFS_IOC_SET_FEATURES:
return btrfs_ioctl_set_features(file, argp);
case FS_IOC_FSGETXATTR:
return btrfs_ioctl_fsgetxattr(file, argp);
case FS_IOC_FSSETXATTR:
return btrfs_ioctl_fssetxattr(file, argp);
case BTRFS_IOC_GET_SUBVOL_INFO:
return btrfs_ioctl_get_subvol_info(file, argp);
case BTRFS_IOC_GET_SUBVOL_ROOTREF:
@ -5067,12 +4915,6 @@ long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
* handling is necessary.
*/
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;
case FS_IOC32_SETFLAGS:
cmd = FS_IOC_SETFLAGS;
break;
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;