Release 4.18 fs/reiserfs/xattr_acl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/posix_acl.h>
#include "reiserfs.h"
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/slab.h>
#include <linux/posix_acl_xattr.h>
#include "xattr.h"
#include "acl.h"
#include <linux/uaccess.h>

static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
			    struct inode *inode, int type,
			    struct posix_acl *acl);



int

reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int error, error2;
	struct reiserfs_transaction_handle th;
	size_t jcreate_blocks;
	int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
	int update_mode = 0;
	umode_t mode = inode->i_mode;

	/*
         * Pessimism: We can't assume that anything from the xattr root up
         * has been created.
         */

	jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) +
			 reiserfs_xattr_nblocks(inode, size) * 2;

	reiserfs_write_lock(inode->i_sb);
	error = journal_begin(&th, inode->i_sb, jcreate_blocks);
	reiserfs_write_unlock(inode->i_sb);
	if (error == 0) {
		if (type == ACL_TYPE_ACCESS && acl) {
			error = posix_acl_update_mode(inode, &mode, &acl);
			if (error)
				goto unlock;
			update_mode = 1;
		}
		error = __reiserfs_set_acl(&th, inode, type, acl);
		if (!error && update_mode)
			inode->i_mode = mode;
unlock:
		reiserfs_write_lock(inode->i_sb);
		error2 = journal_end(&th);
		reiserfs_write_unlock(inode->i_sb);
		if (error2)
			error = error2;
	}

	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Mahoney
95
46.34%
3
37.50%
Jan Kara
31
15.12%
1
12.50%
Ernesto A. Fernández
30
14.63%
1
12.50%
Andrew Morton
29
14.15%
1
12.50%
Christoph Hellwig
20
9.76%
2
25.00%
Total
205
100.00%
8
100.00%

/*
 * Convert from filesystem to in-memory representation.
 */


static struct posix_acl *reiserfs_posix_acl_from_disk(const void *value, size_t size)
{
	const char *end = (char *)value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(reiserfs_acl_header))
		return ERR_PTR(-EINVAL);
	if (((reiserfs_acl_header *) value)->a_version !=
	    cpu_to_le32(REISERFS_ACL_VERSION))
		return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(reiserfs_acl_header);
	count = reiserfs_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;
	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n = 0; n < count; n++) {
		reiserfs_acl_entry *entry = (reiserfs_acl_entry *) value;
		if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
			goto fail;
		acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch (acl->a_entries[n].e_tag) {
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			value = (char *)value +
			    sizeof(reiserfs_acl_entry_short);
			break;

		case ACL_USER:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_uid = 
				make_kuid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		case ACL_GROUP:
			value = (char *)value + sizeof(reiserfs_acl_entry);
			if ((char *)value > end)
				goto fail;
			acl->a_entries[n].e_gid =
				make_kgid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;

		default:
			goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;

fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
347
87.19%
1
33.33%
Eric W. Biedermann
50
12.56%
1
33.33%
Christoph Hellwig
1
0.25%
1
33.33%
Total
398
100.00%
3
100.00%

/*
 * Convert from in-memory to filesystem representation.
 */


static void *reiserfs_posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
{
	reiserfs_acl_header *ext_acl;
	char *e;
	int n;

	*size = reiserfs_acl_size(acl->a_count);
	ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
						  acl->a_count *
						  sizeof(reiserfs_acl_entry),
						  GFP_NOFS);
	if (!ext_acl)
		return ERR_PTR(-ENOMEM);
	ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
	e = (char *)ext_acl + sizeof(reiserfs_acl_header);
	for (n = 0; n < acl->a_count; n++) {
		const struct posix_acl_entry *acl_e = &acl->a_entries[n];
		reiserfs_acl_entry *entry = (reiserfs_acl_entry *) e;
		entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
		switch (acl->a_entries[n].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
				from_kuid(&init_user_ns, acl_e->e_uid));
			e += sizeof(reiserfs_acl_entry);
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
				from_kgid(&init_user_ns, acl_e->e_gid));
			e += sizeof(reiserfs_acl_entry);
			break;

		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			e += sizeof(reiserfs_acl_entry_short);
			break;

		default:
			goto fail;
		}
	}
	return (char *)ext_acl;

fail:
	kfree(ext_acl);
	return ERR_PTR(-EINVAL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
232
82.86%
1
33.33%
Eric W. Biedermann
47
16.79%
1
33.33%
Christoph Hellwig
1
0.36%
1
33.33%
Total
280
100.00%
3
100.00%

/*
 * Inode operation get_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */


struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
{
	char *name, *value;
	struct posix_acl *acl;
	int size;
	int retval;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}

	size = reiserfs_xattr_get(inode, name, NULL, 0);
	if (size < 0) {
		if (size == -ENODATA || size == -ENOSYS)
			return NULL;
		return ERR_PTR(size);
	}

	value = kmalloc(size, GFP_NOFS);
	if (!value)
		return ERR_PTR(-ENOMEM);

	retval = reiserfs_xattr_get(inode, name, value, size);
	if (retval == -ENODATA || retval == -ENOSYS) {
		/*
                 * This shouldn't actually happen as it should have
                 * been caught above.. but just in case
                 */
		acl = NULL;
	} else if (retval < 0) {
		acl = ERR_PTR(retval);
	} else {
		acl = reiserfs_posix_acl_from_disk(value, retval);
	}

	kfree(value);
	return acl;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
180
94.74%
1
14.29%
Al Viro
4
2.11%
1
14.29%
Andreas Gruenbacher
2
1.05%
1
14.29%
Jeff Mahoney
2
1.05%
2
28.57%
Christoph Hellwig
1
0.53%
1
14.29%
Adrian Bunk
1
0.53%
1
14.29%
Total
190
100.00%
7
100.00%

/*
 * Inode operation set_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */

static int

__reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
		 int type, struct posix_acl *acl)
{
	char *name;
	void *value = NULL;
	size_t size = 0;
	int error;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		value = reiserfs_posix_acl_to_disk(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0);

	/*
         * Ensure that the inode gets dirtied if we're only using
         * the mode bits and an old ACL didn't exist. We don't need
         * to check if the inode is hashed here since we won't get
         * called by reiserfs_inherit_default_acl().
         */
	if (error == -ENODATA) {
		error = 0;
		if (type == ACL_TYPE_ACCESS) {
			inode->i_ctime = current_time(inode);
			mark_inode_dirty(inode);
		}
	}

	kfree(value);

	if (!error)
		set_cached_acl(inode, type, acl);

	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
146
75.26%
1
9.09%
Jeff Mahoney
37
19.07%
4
36.36%
Deepa Dinamani
4
2.06%
1
9.09%
Andreas Gruenbacher
2
1.03%
1
9.09%
Christoph Hellwig
2
1.03%
2
18.18%
Al Viro
2
1.03%
1
9.09%
Adrian Bunk
1
0.52%
1
9.09%
Total
194
100.00%
11
100.00%

/*
 * dir->i_mutex: locked,
 * inode is new and not released into the wild yet
 */

int

reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
			     struct inode *dir, struct dentry *dentry,
			     struct inode *inode)
{
	struct posix_acl *default_acl, *acl;
	int err = 0;

	/* ACLs only get applied to files and directories */
	if (S_ISLNK(inode->i_mode))
		return 0;

	/*
         * ACLs can only be used on "new" objects, so if it's an old object
         * there is nothing to inherit from
         */
	if (get_inode_sd_version(dir) == STAT_DATA_V1)
		goto apply_umask;

	/*
         * Don't apply ACLs to objects in the .reiserfs_priv tree.. This
         * would be useless since permissions are ignored, and a pain because
         * it introduces locking cycles
         */
	if (IS_PRIVATE(dir)) {
		inode->i_flags |= S_PRIVATE;
		goto apply_umask;
	}

	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	if (err)
		return err;

	if (default_acl) {
		err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
					 default_acl);
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!err)
			err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
						 acl);
		posix_acl_release(acl);
	}

	return err;

apply_umask:
	/* no ACL, apply umask */
	inode->i_mode &= ~current_umask();
	return err;
}

Contributors
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Tokens
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Commits
CommitProp
Andrew Morton
128
71.91%
1
14.29%
Christoph Hellwig
30
16.85%
1
14.29%
Jeff Mahoney
16
8.99%
3
42.86%
Al Viro
4
2.25%
2
28.57%
Total
178
100.00%
7
100.00%

/* This is used to cache the default acl before a new object is created.
 * The biggest reason for this is to get an idea of how many blocks will
 * actually be required for the create operation if we must inherit an ACL.
 * An ACL write can add up to 3 object creations and an additional file write
 * so we'd prefer not to reserve that many blocks in the journal if we can.
 * It also has the advantage of not loading the ACL with a transaction open,
 * this may seem silly, but if the owner of the directory is doing the
 * creation, the ACL may not be loaded since the permissions wouldn't require
 * it.
 * We return the number of blocks required for the transaction.
 */


int reiserfs_cache_default_acl(struct inode *inode)
{
	struct posix_acl *acl;
	int nblocks = 0;

	if (IS_PRIVATE(inode))
		return 0;

	acl = get_acl(inode, ACL_TYPE_DEFAULT);

	if (acl && !IS_ERR(acl)) {
		int size = reiserfs_acl_size(acl->a_count);

		/* Other xattrs can be created during inode creation. We don't
                 * want to claim too many blocks, so we check to see if we
                 * we need to create the tree to the xattrs, and then we
                 * just want two files. */
		nblocks = reiserfs_xattr_jcreate_nblocks(inode);
		nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);

		REISERFS_I(inode)->i_flags |= i_has_xattr_dir;

		/* We need to account for writes + bitmaps for two files */
		nblocks += reiserfs_xattr_nblocks(inode, size) * 4;
		posix_acl_release(acl);
	}

	return nblocks;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Mahoney
62
57.94%
2
33.33%
Andrew Morton
36
33.64%
1
16.67%
Jan Kara
7
6.54%
1
16.67%
Al Viro
1
0.93%
1
16.67%
Linus Torvalds
1
0.93%
1
16.67%
Total
107
100.00%
6
100.00%

/*
 * Called under i_mutex
 */


int reiserfs_acl_chmod(struct inode *inode)
{
	if (IS_PRIVATE(inode))
		return 0;
	if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
	    !reiserfs_posixacl(inode->i_sb))
		return 0;

	return posix_acl_chmod(inode, inode->i_mode);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
32
64.00%
1
20.00%
Jeff Mahoney
15
30.00%
2
40.00%
Christoph Hellwig
2
4.00%
1
20.00%
Linus Torvalds
1
2.00%
1
20.00%
Total
50
100.00%
5
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
1157
69.32%
1
2.94%
Jeff Mahoney
235
14.08%
8
23.53%
Eric W. Biedermann
97
5.81%
1
2.94%
Christoph Hellwig
59
3.54%
4
11.76%
Jan Kara
38
2.28%
2
5.88%
Ernesto A. Fernández
30
1.80%
1
2.94%
Adrian Bunk
19
1.14%
2
5.88%
Al Viro
14
0.84%
7
20.59%
Deepa Dinamani
4
0.24%
1
2.94%
Andreas Gruenbacher
4
0.24%
1
2.94%
Randy Dunlap
3
0.18%
1
2.94%
Tejun Heo
3
0.18%
1
2.94%
Jes Sorensen
2
0.12%
1
2.94%
Linus Torvalds
2
0.12%
1
2.94%
Greg Kroah-Hartman
1
0.06%
1
2.94%
Fabian Frederick
1
0.06%
1
2.94%
Total
1669
100.00%
34
100.00%
Directory: fs/reiserfs

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