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https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
8782a9aea3
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
146 lines
3 KiB
C
146 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/jfs/ioctl.c
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*
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* Copyright (C) 2006 Herbert Poetzl
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* adapted from Remy Card's ext2/ioctl.c
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*/
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#include <linux/fs.h>
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#include <linux/ctype.h>
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#include <linux/capability.h>
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#include <linux/mount.h>
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#include <linux/time.h>
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#include <linux/sched.h>
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#include <linux/blkdev.h>
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#include <asm/current.h>
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#include <linux/uaccess.h>
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#include <linux/fileattr.h>
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#include "jfs_filsys.h"
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#include "jfs_debug.h"
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#include "jfs_incore.h"
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#include "jfs_dinode.h"
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#include "jfs_inode.h"
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#include "jfs_dmap.h"
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#include "jfs_discard.h"
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static struct {
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long jfs_flag;
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long ext2_flag;
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} jfs_map[] = {
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{JFS_NOATIME_FL, FS_NOATIME_FL},
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{JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
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{JFS_SYNC_FL, FS_SYNC_FL},
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{JFS_SECRM_FL, FS_SECRM_FL},
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{JFS_UNRM_FL, FS_UNRM_FL},
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{JFS_APPEND_FL, FS_APPEND_FL},
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{JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
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{0, 0},
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};
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static long jfs_map_ext2(unsigned long flags, int from)
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{
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int index=0;
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long mapped=0;
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while (jfs_map[index].jfs_flag) {
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if (from) {
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if (jfs_map[index].ext2_flag & flags)
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mapped |= jfs_map[index].jfs_flag;
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} else {
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if (jfs_map[index].jfs_flag & flags)
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mapped |= jfs_map[index].ext2_flag;
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}
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index++;
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}
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return mapped;
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}
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int jfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
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{
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struct jfs_inode_info *jfs_inode = JFS_IP(d_inode(dentry));
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unsigned int flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
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if (d_is_special(dentry))
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return -ENOTTY;
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fileattr_fill_flags(fa, jfs_map_ext2(flags, 0));
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return 0;
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}
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int jfs_fileattr_set(struct mnt_idmap *idmap,
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struct dentry *dentry, struct fileattr *fa)
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{
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struct inode *inode = d_inode(dentry);
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struct jfs_inode_info *jfs_inode = JFS_IP(inode);
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unsigned int flags;
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if (d_is_special(dentry))
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return -ENOTTY;
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if (fileattr_has_fsx(fa))
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return -EOPNOTSUPP;
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flags = jfs_map_ext2(fa->flags, 1);
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if (!S_ISDIR(inode->i_mode))
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flags &= ~JFS_DIRSYNC_FL;
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/* Is it quota file? Do not allow user to mess with it */
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if (IS_NOQUOTA(inode))
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return -EPERM;
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flags = flags & JFS_FL_USER_MODIFIABLE;
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flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
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jfs_inode->mode2 = flags;
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jfs_set_inode_flags(inode);
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inode->i_ctime = current_time(inode);
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mark_inode_dirty(inode);
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return 0;
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}
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long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(filp);
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switch (cmd) {
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case FITRIM:
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{
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struct super_block *sb = inode->i_sb;
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struct fstrim_range range;
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s64 ret = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!bdev_max_discard_sectors(sb->s_bdev)) {
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jfs_warn("FITRIM not supported on device");
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return -EOPNOTSUPP;
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}
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if (copy_from_user(&range, (struct fstrim_range __user *)arg,
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sizeof(range)))
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return -EFAULT;
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range.minlen = max_t(unsigned int, range.minlen,
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bdev_discard_granularity(sb->s_bdev));
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ret = jfs_ioc_trim(inode, &range);
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if (ret < 0)
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return ret;
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if (copy_to_user((struct fstrim_range __user *)arg, &range,
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sizeof(range)))
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return -EFAULT;
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return 0;
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}
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default:
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return -ENOTTY;
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}
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}
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