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hfsplus: 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>
This commit is contained in:
Miklos Szeredi 2021-04-07 14:36:44 +02:00
parent d701ea284c
commit 9cbae74838
4 changed files with 59 additions and 95 deletions
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2
fs/hfsplus/dir.c
View File

@ -569,6 +569,8 @@ const struct inode_operations hfsplus_dir_inode_operations = {
.rename = hfsplus_rename,
.getattr = hfsplus_getattr,
.listxattr = hfsplus_listxattr,
.fileattr_get = hfsplus_fileattr_get,
.fileattr_set = hfsplus_fileattr_set,
};
const struct file_operations hfsplus_dir_operations = {

14
fs/hfsplus/hfsplus_fs.h
View File

@ -344,17 +344,6 @@ static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
#define hfs_brec_goto hfsplus_brec_goto
#define hfs_part_find hfsplus_part_find
/*
* definitions for ext2 flag ioctls (linux really needs a generic
* interface for this).
*/
/* ext2 ioctls (EXT2_IOC_GETFLAGS and EXT2_IOC_SETFLAGS) to support
* chattr/lsattr */
#define HFSPLUS_IOC_EXT2_GETFLAGS FS_IOC_GETFLAGS
#define HFSPLUS_IOC_EXT2_SETFLAGS FS_IOC_SETFLAGS
/*
* hfs+-specific ioctl for making the filesystem bootable
*/
@ -493,6 +482,9 @@ int hfsplus_getattr(struct user_namespace *mnt_userns, const struct path *path,
unsigned int query_flags);
int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
int datasync);
int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int hfsplus_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa);
/* ioctl.c */
long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);

54
fs/hfsplus/inode.c
View File

@ -17,6 +17,7 @@
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/uio.h>
#include <linux/fileattr.h>
#include "hfsplus_fs.h"
#include "hfsplus_raw.h"
@ -353,6 +354,8 @@ static const struct inode_operations hfsplus_file_inode_operations = {
.setattr = hfsplus_setattr,
.getattr = hfsplus_getattr,
.listxattr = hfsplus_listxattr,
.fileattr_get = hfsplus_fileattr_get,
.fileattr_set = hfsplus_fileattr_set,
};
static const struct file_operations hfsplus_file_operations = {
@ -628,3 +631,54 @@ out:
hfs_find_exit(&fd);
return 0;
}
int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
unsigned int flags = 0;
if (inode->i_flags & S_IMMUTABLE)
flags |= FS_IMMUTABLE_FL;
if (inode->i_flags & S_APPEND)
flags |= FS_APPEND_FL;
if (hip->userflags & HFSPLUS_FLG_NODUMP)
flags |= FS_NODUMP_FL;
fileattr_fill_flags(fa, flags);
return 0;
}
int hfsplus_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
unsigned int new_fl = 0;
if (fileattr_has_fsx(fa))
return -EOPNOTSUPP;
/* don't silently ignore unsupported ext2 flags */
if (fa->flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
return -EOPNOTSUPP;
if (fa->flags & FS_IMMUTABLE_FL)
new_fl |= S_IMMUTABLE;
if (fa->flags & FS_APPEND_FL)
new_fl |= S_APPEND;
inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
if (fa->flags & FS_NODUMP_FL)
hip->userflags |= HFSPLUS_FLG_NODUMP;
else
hip->userflags &= ~HFSPLUS_FLG_NODUMP;
inode->i_ctime = current_time(inode);
mark_inode_dirty(inode);
return 0;
}

84
fs/hfsplus/ioctl.c
View File

@ -57,95 +57,11 @@ static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
return 0;
}
static inline unsigned int hfsplus_getflags(struct inode *inode)
{
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
unsigned int flags = 0;
if (inode->i_flags & S_IMMUTABLE)
flags |= FS_IMMUTABLE_FL;
if (inode->i_flags & S_APPEND)
flags |= FS_APPEND_FL;
if (hip->userflags & HFSPLUS_FLG_NODUMP)
flags |= FS_NODUMP_FL;
return flags;
}
static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
{
struct inode *inode = file_inode(file);
unsigned int flags = hfsplus_getflags(inode);
return put_user(flags, user_flags);
}
static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
{
struct inode *inode = file_inode(file);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
unsigned int flags, new_fl = 0;
unsigned int oldflags = hfsplus_getflags(inode);
int err = 0;
err = mnt_want_write_file(file);
if (err)
goto out;
if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EACCES;
goto out_drop_write;
}
if (get_user(flags, user_flags)) {
err = -EFAULT;
goto out_drop_write;
}
inode_lock(inode);
err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
if (err)
goto out_unlock_inode;
/* don't silently ignore unsupported ext2 flags */
if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
err = -EOPNOTSUPP;
goto out_unlock_inode;
}
if (flags & FS_IMMUTABLE_FL)
new_fl |= S_IMMUTABLE;
if (flags & FS_APPEND_FL)
new_fl |= S_APPEND;
inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
if (flags & FS_NODUMP_FL)
hip->userflags |= HFSPLUS_FLG_NODUMP;
else
hip->userflags &= ~HFSPLUS_FLG_NODUMP;
inode->i_ctime = current_time(inode);
mark_inode_dirty(inode);
out_unlock_inode:
inode_unlock(inode);
out_drop_write:
mnt_drop_write_file(file);
out:
return err;
}
long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
switch (cmd) {
case HFSPLUS_IOC_EXT2_GETFLAGS:
return hfsplus_ioctl_getflags(file, argp);
case HFSPLUS_IOC_EXT2_SETFLAGS:
return hfsplus_ioctl_setflags(file, argp);
case HFSPLUS_IOC_BLESS:
return hfsplus_ioctl_bless(file, argp);
default: