Release 4.10 fs/reiserfs/ioctl.c

/*
 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include "reiserfs.h"
#include <linux/time.h>
#include <linux/uaccess.h>
#include <linux/pagemap.h>
#include <linux/compat.h>

/*
 * reiserfs_ioctl - handler for ioctl for inode
 * supported commands:
 *  1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
 *                           and prevent packing file (argument arg has t
 *                            be non-zero)
 *  2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
 *  3) That's all for a while ...
 */


long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	unsigned int flags;
	int err = 0;

	reiserfs_write_lock(inode->i_sb);

	switch (cmd) {
	case REISERFS_IOC_UNPACK:
		if (S_ISREG(inode->i_mode)) {
			if (arg)
				err = reiserfs_unpack(inode, filp);
		} else
			err = -ENOTTY;
		break;
		/*
                 * following two cases are taken from fs/ext2/ioctl.c by Remy
                 * Card (card@masi.ibp.fr)
                 */
	case REISERFS_IOC_GETFLAGS:
		if (!reiserfs_attrs(inode->i_sb)) {
			err = -ENOTTY;
			break;
		}

		flags = REISERFS_I(inode)->i_attrs;
		i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
		err = put_user(flags, (int __user *)arg);
		break;
	case REISERFS_IOC_SETFLAGS:{
			if (!reiserfs_attrs(inode->i_sb)) {
				err = -ENOTTY;
				break;
			}

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

			if (!inode_owner_or_capable(inode)) {
				err = -EPERM;
				goto setflags_out;
			}
			if (get_user(flags, (int __user *)arg)) {
				err = -EFAULT;
				goto setflags_out;
			}
			/*
                         * Is it quota file? Do not allow user to mess with it
                         */
			if (IS_NOQUOTA(inode)) {
				err = -EPERM;
				goto setflags_out;
			}
			if (((flags ^ REISERFS_I(inode)->
			      i_attrs) & (REISERFS_IMMUTABLE_FL |
					  REISERFS_APPEND_FL))
			    && !capable(CAP_LINUX_IMMUTABLE)) {
				err = -EPERM;
				goto setflags_out;
			}
			if ((flags & REISERFS_NOTAIL_FL) &&
			    S_ISREG(inode->i_mode)) {
				int result;

				result = reiserfs_unpack(inode, filp);
				if (result) {
					err = result;
					goto setflags_out;
				}
			}
			sd_attrs_to_i_attrs(flags, inode);
			REISERFS_I(inode)->i_attrs = flags;
			inode->i_ctime = current_time(inode);
			mark_inode_dirty(inode);
setflags_out:
			mnt_drop_write_file(filp);
			break;
		}
	case REISERFS_IOC_GETVERSION:
		err = put_user(inode->i_generation, (int __user *)arg);
		break;
	case REISERFS_IOC_SETVERSION:
		if (!inode_owner_or_capable(inode)) {
			err = -EPERM;
			break;
		}
		err = mnt_want_write_file(filp);
		if (err)
			break;
		if (get_user(inode->i_generation, (int __user *)arg)) {
			err = -EFAULT;
			goto setversion_out;
		}
		inode->i_ctime = current_time(inode);
		mark_inode_dirty(inode);
setversion_out:
		mnt_drop_write_file(filp);
		break;
	default:
		err = -ENOTTY;
	}

	reiserfs_write_unlock(inode->i_sb);

	return err;
}

Contributors
Person
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andrew morton
andrew morton
230
49.04%
2
12.50%
dave hansen
dave hansen
80
17.06%
1
6.25%
frederic weisbecker
frederic weisbecker
64
13.65%
2
12.50%
linus torvalds
linus torvalds
39
8.32%
1
6.25%
jeff mahoney
jeff mahoney
22
4.69%
1
6.25%
al viro
al viro
11
2.35%
4
25.00%
jan kara
jan kara
9
1.92%
1
6.25%
deepa dinamani
deepa dinamani
8
1.71%
1
6.25%
jiri slaby
jiri slaby
2
0.43%
1
6.25%
serge hallyn
serge hallyn
2
0.43%
1
6.25%
satyam sharma
satyam sharma
2
0.43%
1
6.25%
Total
469
100.00%
16
100.00%

#ifdef CONFIG_COMPAT


long reiserfs_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 REISERFS_IOC32_UNPACK:
		cmd = REISERFS_IOC_UNPACK;
		break;
	case REISERFS_IOC32_GETFLAGS:
		cmd = REISERFS_IOC_GETFLAGS;
		break;
	case REISERFS_IOC32_SETFLAGS:
		cmd = REISERFS_IOC_SETFLAGS;
		break;
	case REISERFS_IOC32_GETVERSION:
		cmd = REISERFS_IOC_GETVERSION;
		break;
	case REISERFS_IOC32_SETVERSION:
		cmd = REISERFS_IOC_SETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
Contributors
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david howells
david howells
85
97.70%
1
33.33%
jeff mahoney
jeff mahoney
1
1.15%
1
33.33%
frederic weisbecker
frederic weisbecker
1
1.15%
1
33.33%
Total
87
100.00%
3
100.00%

#endif

int reiserfs_commit_write(struct file *f, struct page *page,
			  unsigned from, unsigned to);
/*
 * reiserfs_unpack
 * Function try to convert tail from direct item into indirect.
 * It set up nopack attribute in the REISERFS_I(inode)->nopack
 */


int reiserfs_unpack(struct inode *inode, struct file *filp)
{
	int retval = 0;
	int index;
	struct page *page;
	struct address_space *mapping;
	unsigned long write_from;
	unsigned long blocksize = inode->i_sb->s_blocksize;

	if (inode->i_size == 0) {
		REISERFS_I(inode)->i_flags |= i_nopack_mask;
		return 0;
	}
	/* ioctl already done */
	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
		return 0;
	}

	/* we need to make sure nobody is changing the file size beneath us */
{
	int depth = reiserfs_write_unlock_nested(inode->i_sb);
	inode_lock(inode);
	reiserfs_write_lock_nested(inode->i_sb, depth);
}

	reiserfs_write_lock(inode->i_sb);

	write_from = inode->i_size & (blocksize - 1);
	/* if we are on a block boundary, we are already unpacked.  */
	if (write_from == 0) {
		REISERFS_I(inode)->i_flags |= i_nopack_mask;
		goto out;
	}

	/*
         * we unpack by finding the page with the tail, and calling
         * __reiserfs_write_begin on that page.  This will force a
         * reiserfs_get_block to unpack the tail for us.
         */
	index = inode->i_size >> PAGE_SHIFT;
	mapping = inode->i_mapping;
	page = grab_cache_page(mapping, index);
	retval = -ENOMEM;
	if (!page) {
		goto out;
	}
	retval = __reiserfs_write_begin(page, write_from, 0);
	if (retval)
		goto out_unlock;

	/* conversion can change page contents, must flush */
	flush_dcache_page(page);
	retval = reiserfs_commit_write(NULL, page, write_from, write_from);
	REISERFS_I(inode)->i_flags |= i_nopack_mask;

out_unlock:
	unlock_page(page);
	put_page(page);

out:
	inode_unlock(inode);
	reiserfs_write_unlock(inode->i_sb);
	return retval;
}
Contributors
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linus torvalds
linus torvalds
190
71.16%
4
23.53%
andrew morton
andrew morton
35
13.11%
3
17.65%
al viro
al viro
19
7.12%
2
11.76%
jeff mahoney
jeff mahoney
9
3.37%
2
11.76%
oleg drokin
oleg drokin
5
1.87%
1
5.88%
frederic weisbecker
frederic weisbecker
3
1.12%
1
5.88%
kirill a. shutemov
kirill a. shutemov
2
0.75%
1
5.88%
christoph hellwig
christoph hellwig
2
0.75%
1
5.88%
chris mason
chris mason
1
0.37%
1
5.88%
vladimir saveliev
vladimir saveliev
1
0.37%
1
5.88%
Total
267
100.00%
17
100.00%

Overall Contributors
Person
Tokens
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Commits
CommitProp
andrew morton
andrew morton
265
30.29%
4
10.81%
linus torvalds
linus torvalds
243
27.77%
4
10.81%
david howells
david howells
91
10.40%
1
2.70%
dave hansen
dave hansen
83
9.49%
1
2.70%
frederic weisbecker
frederic weisbecker
68
7.77%
3
8.11%
jeff mahoney
jeff mahoney
34
3.89%
3
8.11%
al viro
al viro
31
3.54%
7
18.92%
vladimir saveliev
vladimir saveliev
21
2.40%
1
2.70%
jan kara
jan kara
9
1.03%
1
2.70%
deepa dinamani
deepa dinamani
8
0.91%
1
2.70%
oleg drokin
oleg drokin
5
0.57%
1
2.70%
christoph hellwig
christoph hellwig
3
0.34%
2
5.41%
randy dunlap
randy dunlap
3
0.34%
1
2.70%
jiri slaby
jiri slaby
2
0.23%
1
2.70%
serge hallyn
serge hallyn
2
0.23%
1
2.70%
satyam sharma
satyam sharma
2
0.23%
1
2.70%
kirill a. shutemov
kirill a. shutemov
2
0.23%
1
2.70%
chris mason
chris mason
1
0.11%
1
2.70%
fabian frederick
fabian frederick
1
0.11%
1
2.70%
dave jones
dave jones
1
0.11%
1
2.70%
Total
875
100.00%
37
100.00%
Directory: fs/reiserfs

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