Release 4.11 fs/jfs/ioctl.c

/*
 * linux/fs/jfs/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
#include <linux/mount.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <asm/current.h>
#include <linux/uaccess.h>

#include "jfs_filsys.h"
#include "jfs_debug.h"
#include "jfs_incore.h"
#include "jfs_dinode.h"
#include "jfs_inode.h"
#include "jfs_dmap.h"
#include "jfs_discard.h"

static struct {
	
long jfs_flag;
	
long ext2_flag;
} 
jfs_map[] = {
	{JFS_NOATIME_FL,	FS_NOATIME_FL},
	{JFS_DIRSYNC_FL,	FS_DIRSYNC_FL},
	{JFS_SYNC_FL,		FS_SYNC_FL},
	{JFS_SECRM_FL,		FS_SECRM_FL},
	{JFS_UNRM_FL,		FS_UNRM_FL},
	{JFS_APPEND_FL,		FS_APPEND_FL},
	{JFS_IMMUTABLE_FL,	FS_IMMUTABLE_FL},
	{0, 0},
};



static long jfs_map_ext2(unsigned long flags, int from)
{
	int index=0;
	long mapped=0;

	while (jfs_map[index].jfs_flag) {
		if (from) {
			if (jfs_map[index].ext2_flag & flags)
				mapped |= jfs_map[index].jfs_flag;
		} else {
			if (jfs_map[index].jfs_flag & flags)
				mapped |= jfs_map[index].ext2_flag;
		}
		index++;
	}
	return mapped;
}


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long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct jfs_inode_info *jfs_inode = JFS_IP(inode);
	unsigned int flags;

	switch (cmd) {
	case JFS_IOC_GETFLAGS:
		jfs_get_inode_flags(jfs_inode);
		flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
		flags = jfs_map_ext2(flags, 0);
		return put_user(flags, (int __user *) arg);
	case JFS_IOC_SETFLAGS: {
		unsigned int oldflags;
		int err;

		err = mnt_want_write_file(filp);
		if (err)
			return err;

		if (!inode_owner_or_capable(inode)) {
			err = -EACCES;
			goto setflags_out;
		}
		if (get_user(flags, (int __user *) arg)) {
			err = -EFAULT;
			goto setflags_out;
		}

		flags = jfs_map_ext2(flags, 1);
		if (!S_ISDIR(inode->i_mode))
			flags &= ~JFS_DIRSYNC_FL;

		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode)) {
			err = -EPERM;
			goto setflags_out;
		}

		/* Lock against other parallel changes of flags */
		inode_lock(inode);

		jfs_get_inode_flags(jfs_inode);
		oldflags = jfs_inode->mode2;

		/*
                 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
                 * the relevant capability.
                 */
		if ((oldflags & JFS_IMMUTABLE_FL) ||
			((flags ^ oldflags) &
			(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				inode_unlock(inode);
				err = -EPERM;
				goto setflags_out;
			}
		}

		flags = flags & JFS_FL_USER_MODIFIABLE;
		flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
		jfs_inode->mode2 = flags;

		jfs_set_inode_flags(inode);
		inode_unlock(inode);
		inode->i_ctime = current_time(inode);
		mark_inode_dirty(inode);
setflags_out:
		mnt_drop_write_file(filp);
		return err;
	}

	case FITRIM:
	{
		struct super_block *sb = inode->i_sb;
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		struct fstrim_range range;
		s64 ret = 0;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (!blk_queue_discard(q)) {
			jfs_warn("FITRIM not supported on device");
			return -EOPNOTSUPP;
		}

		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
		    sizeof(range)))
			return -EFAULT;

		range.minlen = max_t(unsigned int, range.minlen,
			q->limits.discard_granularity);

		ret = jfs_ioc_trim(inode, &range);
		if (ret < 0)
			return ret;

		if (copy_to_user((struct fstrim_range __user *)arg, &range,
		    sizeof(range)))
			return -EFAULT;

		return 0;
	}

	default:
		return -ENOTTY;
	}
}

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Herbert Pötzl
214
45.53%
1
7.69%
Tino Reichardt
151
32.13%
1
7.69%
Dave Hansen
48
10.21%
1
7.69%
Andi Kleen
23
4.89%
1
7.69%
Jan Kara
10
2.13%
1
7.69%
Dave Kleikamp
10
2.13%
1
7.69%
Al Viro
8
1.70%
4
30.77%
Deepa Dinamani
4
0.85%
1
7.69%
Serge E. Hallyn
1
0.21%
1
7.69%
Satyam Sharma
1
0.21%
1
7.69%
Total
470
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13
100.00%

#ifdef CONFIG_COMPAT


long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	/* While these ioctl numbers defined with 'long' and have different
         * numbers than the 64bit ABI,
         * the actual implementation only deals with ints and is compatible.
         */
	switch (cmd) {
	case JFS_IOC_GETFLAGS32:
		cmd = JFS_IOC_GETFLAGS;
		break;
	case JFS_IOC_SETFLAGS32:
		cmd = JFS_IOC_SETFLAGS;
		break;
	}
	return jfs_ioctl(filp, cmd, arg);
}
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#endif
Overall Contributors
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Herbert Pötzl
386
53.09%
1
5.88%
Tino Reichardt
166
22.83%
1
5.88%
Andi Kleen
79
10.87%
2
11.76%
Dave Hansen
51
7.02%
1
5.88%
Al Viro
11
1.51%
5
29.41%
Dave Kleikamp
10
1.38%
1
5.88%
Jan Kara
10
1.38%
1
5.88%
David Howells
7
0.96%
1
5.88%
Deepa Dinamani
4
0.55%
1
5.88%
Serge E. Hallyn
1
0.14%
1
5.88%
Satyam Sharma
1
0.14%
1
5.88%
Linus Torvalds
1
0.14%
1
5.88%
Total
727
100.00%
17
100.00%
Directory: fs/jfs

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