1 #include <linux/capability.h>
3 #include <linux/posix_acl.h>
5 #include <linux/errno.h>
6 #include <linux/pagemap.h>
7 #include <linux/xattr.h>
8 #include <linux/slab.h>
9 #include <linux/posix_acl_xattr.h>
12 #include <linux/uaccess.h>
14 static int __reiserfs_set_acl(struct reiserfs_transaction_handle
*th
,
15 struct inode
*inode
, int type
,
16 struct posix_acl
*acl
);
20 reiserfs_set_acl(struct inode
*inode
, struct posix_acl
*acl
, int type
)
23 struct reiserfs_transaction_handle th
;
24 size_t jcreate_blocks
;
25 int size
= acl
? posix_acl_xattr_size(acl
->a_count
) : 0;
27 umode_t mode
= inode
->i_mode
;
30 * Pessimism: We can't assume that anything from the xattr root up
34 jcreate_blocks
= reiserfs_xattr_jcreate_nblocks(inode
) +
35 reiserfs_xattr_nblocks(inode
, size
) * 2;
37 reiserfs_write_lock(inode
->i_sb
);
38 error
= journal_begin(&th
, inode
->i_sb
, jcreate_blocks
);
39 reiserfs_write_unlock(inode
->i_sb
);
41 if (type
== ACL_TYPE_ACCESS
&& acl
) {
42 error
= posix_acl_update_mode(inode
, &mode
, &acl
);
47 error
= __reiserfs_set_acl(&th
, inode
, type
, acl
);
48 if (!error
&& update_mode
)
51 reiserfs_write_lock(inode
->i_sb
);
52 error2
= journal_end(&th
);
53 reiserfs_write_unlock(inode
->i_sb
);
62 * Convert from filesystem to in-memory representation.
64 static struct posix_acl
*reiserfs_posix_acl_from_disk(const void *value
, size_t size
)
66 const char *end
= (char *)value
+ size
;
68 struct posix_acl
*acl
;
72 if (size
< sizeof(reiserfs_acl_header
))
73 return ERR_PTR(-EINVAL
);
74 if (((reiserfs_acl_header
*) value
)->a_version
!=
75 cpu_to_le32(REISERFS_ACL_VERSION
))
76 return ERR_PTR(-EINVAL
);
77 value
= (char *)value
+ sizeof(reiserfs_acl_header
);
78 count
= reiserfs_acl_count(size
);
80 return ERR_PTR(-EINVAL
);
83 acl
= posix_acl_alloc(count
, GFP_NOFS
);
85 return ERR_PTR(-ENOMEM
);
86 for (n
= 0; n
< count
; n
++) {
87 reiserfs_acl_entry
*entry
= (reiserfs_acl_entry
*) value
;
88 if ((char *)value
+ sizeof(reiserfs_acl_entry_short
) > end
)
90 acl
->a_entries
[n
].e_tag
= le16_to_cpu(entry
->e_tag
);
91 acl
->a_entries
[n
].e_perm
= le16_to_cpu(entry
->e_perm
);
92 switch (acl
->a_entries
[n
].e_tag
) {
97 value
= (char *)value
+
98 sizeof(reiserfs_acl_entry_short
);
102 value
= (char *)value
+ sizeof(reiserfs_acl_entry
);
103 if ((char *)value
> end
)
105 acl
->a_entries
[n
].e_uid
=
106 make_kuid(&init_user_ns
,
107 le32_to_cpu(entry
->e_id
));
110 value
= (char *)value
+ sizeof(reiserfs_acl_entry
);
111 if ((char *)value
> end
)
113 acl
->a_entries
[n
].e_gid
=
114 make_kgid(&init_user_ns
,
115 le32_to_cpu(entry
->e_id
));
127 posix_acl_release(acl
);
128 return ERR_PTR(-EINVAL
);
132 * Convert from in-memory to filesystem representation.
134 static void *reiserfs_posix_acl_to_disk(const struct posix_acl
*acl
, size_t * size
)
136 reiserfs_acl_header
*ext_acl
;
140 *size
= reiserfs_acl_size(acl
->a_count
);
141 ext_acl
= kmalloc(sizeof(reiserfs_acl_header
) +
143 sizeof(reiserfs_acl_entry
),
146 return ERR_PTR(-ENOMEM
);
147 ext_acl
->a_version
= cpu_to_le32(REISERFS_ACL_VERSION
);
148 e
= (char *)ext_acl
+ sizeof(reiserfs_acl_header
);
149 for (n
= 0; n
< acl
->a_count
; n
++) {
150 const struct posix_acl_entry
*acl_e
= &acl
->a_entries
[n
];
151 reiserfs_acl_entry
*entry
= (reiserfs_acl_entry
*) e
;
152 entry
->e_tag
= cpu_to_le16(acl
->a_entries
[n
].e_tag
);
153 entry
->e_perm
= cpu_to_le16(acl
->a_entries
[n
].e_perm
);
154 switch (acl
->a_entries
[n
].e_tag
) {
156 entry
->e_id
= cpu_to_le32(
157 from_kuid(&init_user_ns
, acl_e
->e_uid
));
158 e
+= sizeof(reiserfs_acl_entry
);
161 entry
->e_id
= cpu_to_le32(
162 from_kgid(&init_user_ns
, acl_e
->e_gid
));
163 e
+= sizeof(reiserfs_acl_entry
);
170 e
+= sizeof(reiserfs_acl_entry_short
);
177 return (char *)ext_acl
;
181 return ERR_PTR(-EINVAL
);
185 * Inode operation get_posix_acl().
187 * inode->i_mutex: down
188 * BKL held [before 2.5.x]
190 struct posix_acl
*reiserfs_get_acl(struct inode
*inode
, int type
)
193 struct posix_acl
*acl
;
198 case ACL_TYPE_ACCESS
:
199 name
= XATTR_NAME_POSIX_ACL_ACCESS
;
201 case ACL_TYPE_DEFAULT
:
202 name
= XATTR_NAME_POSIX_ACL_DEFAULT
;
208 size
= reiserfs_xattr_get(inode
, name
, NULL
, 0);
210 if (size
== -ENODATA
|| size
== -ENOSYS
)
212 return ERR_PTR(size
);
215 value
= kmalloc(size
, GFP_NOFS
);
217 return ERR_PTR(-ENOMEM
);
219 retval
= reiserfs_xattr_get(inode
, name
, value
, size
);
220 if (retval
== -ENODATA
|| retval
== -ENOSYS
) {
222 * This shouldn't actually happen as it should have
223 * been caught above.. but just in case
226 } else if (retval
< 0) {
227 acl
= ERR_PTR(retval
);
229 acl
= reiserfs_posix_acl_from_disk(value
, retval
);
237 * Inode operation set_posix_acl().
239 * inode->i_mutex: down
240 * BKL held [before 2.5.x]
243 __reiserfs_set_acl(struct reiserfs_transaction_handle
*th
, struct inode
*inode
,
244 int type
, struct posix_acl
*acl
)
252 case ACL_TYPE_ACCESS
:
253 name
= XATTR_NAME_POSIX_ACL_ACCESS
;
255 case ACL_TYPE_DEFAULT
:
256 name
= XATTR_NAME_POSIX_ACL_DEFAULT
;
257 if (!S_ISDIR(inode
->i_mode
))
258 return acl
? -EACCES
: 0;
265 value
= reiserfs_posix_acl_to_disk(acl
, &size
);
267 return (int)PTR_ERR(value
);
270 error
= reiserfs_xattr_set_handle(th
, inode
, name
, value
, size
, 0);
273 * Ensure that the inode gets dirtied if we're only using
274 * the mode bits and an old ACL didn't exist. We don't need
275 * to check if the inode is hashed here since we won't get
276 * called by reiserfs_inherit_default_acl().
278 if (error
== -ENODATA
) {
280 if (type
== ACL_TYPE_ACCESS
) {
281 inode
->i_ctime
= current_time(inode
);
282 mark_inode_dirty(inode
);
289 set_cached_acl(inode
, type
, acl
);
295 * dir->i_mutex: locked,
296 * inode is new and not released into the wild yet
299 reiserfs_inherit_default_acl(struct reiserfs_transaction_handle
*th
,
300 struct inode
*dir
, struct dentry
*dentry
,
303 struct posix_acl
*default_acl
, *acl
;
306 /* ACLs only get applied to files and directories */
307 if (S_ISLNK(inode
->i_mode
))
311 * ACLs can only be used on "new" objects, so if it's an old object
312 * there is nothing to inherit from
314 if (get_inode_sd_version(dir
) == STAT_DATA_V1
)
318 * Don't apply ACLs to objects in the .reiserfs_priv tree.. This
319 * would be useless since permissions are ignored, and a pain because
320 * it introduces locking cycles
322 if (IS_PRIVATE(dir
)) {
323 inode
->i_flags
|= S_PRIVATE
;
327 err
= posix_acl_create(dir
, &inode
->i_mode
, &default_acl
, &acl
);
332 err
= __reiserfs_set_acl(th
, inode
, ACL_TYPE_DEFAULT
,
334 posix_acl_release(default_acl
);
338 err
= __reiserfs_set_acl(th
, inode
, ACL_TYPE_ACCESS
,
340 posix_acl_release(acl
);
346 /* no ACL, apply umask */
347 inode
->i_mode
&= ~current_umask();
351 /* This is used to cache the default acl before a new object is created.
352 * The biggest reason for this is to get an idea of how many blocks will
353 * actually be required for the create operation if we must inherit an ACL.
354 * An ACL write can add up to 3 object creations and an additional file write
355 * so we'd prefer not to reserve that many blocks in the journal if we can.
356 * It also has the advantage of not loading the ACL with a transaction open,
357 * this may seem silly, but if the owner of the directory is doing the
358 * creation, the ACL may not be loaded since the permissions wouldn't require
360 * We return the number of blocks required for the transaction.
362 int reiserfs_cache_default_acl(struct inode
*inode
)
364 struct posix_acl
*acl
;
367 if (IS_PRIVATE(inode
))
370 acl
= get_acl(inode
, ACL_TYPE_DEFAULT
);
372 if (acl
&& !IS_ERR(acl
)) {
373 int size
= reiserfs_acl_size(acl
->a_count
);
375 /* Other xattrs can be created during inode creation. We don't
376 * want to claim too many blocks, so we check to see if we
377 * we need to create the tree to the xattrs, and then we
378 * just want two files. */
379 nblocks
= reiserfs_xattr_jcreate_nblocks(inode
);
380 nblocks
+= JOURNAL_BLOCKS_PER_OBJECT(inode
->i_sb
);
382 REISERFS_I(inode
)->i_flags
|= i_has_xattr_dir
;
384 /* We need to account for writes + bitmaps for two files */
385 nblocks
+= reiserfs_xattr_nblocks(inode
, size
) * 4;
386 posix_acl_release(acl
);
393 * Called under i_mutex
395 int reiserfs_acl_chmod(struct inode
*inode
)
397 if (IS_PRIVATE(inode
))
399 if (get_inode_sd_version(inode
) == STAT_DATA_V1
||
400 !reiserfs_posixacl(inode
->i_sb
))
403 return posix_acl_chmod(inode
, inode
->i_mode
);