2 * Copyright (c) 2008, Christoph Hellwig
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "xfs_format.h"
20 #include "xfs_log_format.h"
21 #include "xfs_trans_resv.h"
24 #include "xfs_mount.h"
25 #include "xfs_inode.h"
28 #include "xfs_trace.h"
29 #include <linux/slab.h>
30 #include <linux/xattr.h>
31 #include <linux/posix_acl_xattr.h>
36 * - all ACL updates are protected by inode->i_mutex, which is taken before
37 * calling into this file.
40 STATIC struct posix_acl *
45 struct posix_acl_entry *acl_e;
46 struct posix_acl *acl;
47 struct xfs_acl_entry *ace;
48 unsigned int count, i;
50 count = be32_to_cpu(aclp->acl_cnt);
51 if (count > max_entries)
52 return ERR_PTR(-EFSCORRUPTED);
54 acl = posix_acl_alloc(count, GFP_KERNEL);
56 return ERR_PTR(-ENOMEM);
58 for (i = 0; i < count; i++) {
59 acl_e = &acl->a_entries[i];
60 ace = &aclp->acl_entry[i];
63 * The tag is 32 bits on disk and 16 bits in core.
65 * Because every access to it goes through the core
66 * format first this is not a problem.
68 acl_e->e_tag = be32_to_cpu(ace->ae_tag);
69 acl_e->e_perm = be16_to_cpu(ace->ae_perm);
71 switch (acl_e->e_tag) {
73 acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
76 acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
90 posix_acl_release(acl);
91 return ERR_PTR(-EINVAL);
95 xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
97 const struct posix_acl_entry *acl_e;
98 struct xfs_acl_entry *ace;
101 aclp->acl_cnt = cpu_to_be32(acl->a_count);
102 for (i = 0; i < acl->a_count; i++) {
103 ace = &aclp->acl_entry[i];
104 acl_e = &acl->a_entries[i];
106 ace->ae_tag = cpu_to_be32(acl_e->e_tag);
107 switch (acl_e->e_tag) {
109 ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
112 ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
115 ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
119 ace->ae_perm = cpu_to_be16(acl_e->e_perm);
124 xfs_get_acl(struct inode *inode, int type)
126 struct xfs_inode *ip = XFS_I(inode);
127 struct posix_acl *acl = NULL;
128 struct xfs_acl *xfs_acl;
129 unsigned char *ea_name;
133 trace_xfs_get_acl(ip);
136 case ACL_TYPE_ACCESS:
137 ea_name = SGI_ACL_FILE;
139 case ACL_TYPE_DEFAULT:
140 ea_name = SGI_ACL_DEFAULT;
147 * If we have a cached ACLs value just return it, not need to
148 * go out to the disk.
150 len = XFS_ACL_MAX_SIZE(ip->i_mount);
151 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
153 return ERR_PTR(-ENOMEM);
155 error = xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
159 * If the attribute doesn't exist make sure we have a negative
160 * cache entry, for any other error assume it is transient and
161 * leave the cache entry as ACL_NOT_CACHED.
163 if (error == -ENOATTR)
164 goto out_update_cache;
168 acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
173 set_cached_acl(inode, type, acl);
180 __xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
182 struct xfs_inode *ip = XFS_I(inode);
183 unsigned char *ea_name;
187 case ACL_TYPE_ACCESS:
188 ea_name = SGI_ACL_FILE;
190 case ACL_TYPE_DEFAULT:
191 if (!S_ISDIR(inode->i_mode))
192 return acl ? -EACCES : 0;
193 ea_name = SGI_ACL_DEFAULT;
200 struct xfs_acl *xfs_acl;
201 int len = XFS_ACL_MAX_SIZE(ip->i_mount);
203 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
207 xfs_acl_to_disk(xfs_acl, acl);
209 /* subtract away the unused acl entries */
210 len -= sizeof(struct xfs_acl_entry) *
211 (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
213 error = xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
219 * A NULL ACL argument means we want to remove the ACL.
221 error = xfs_attr_remove(ip, ea_name, ATTR_ROOT);
224 * If the attribute didn't exist to start with that's fine.
226 if (error == -ENOATTR)
231 set_cached_acl(inode, type, acl);
236 xfs_set_mode(struct inode *inode, umode_t mode)
240 if (mode != inode->i_mode) {
243 iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
244 iattr.ia_mode = mode;
245 iattr.ia_ctime = current_fs_time(inode->i_sb);
247 error = xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
254 xfs_acl_exists(struct inode *inode, unsigned char *name)
256 int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));
258 return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
259 ATTR_ROOT|ATTR_KERNOVAL) == 0);
263 posix_acl_access_exists(struct inode *inode)
265 return xfs_acl_exists(inode, SGI_ACL_FILE);
269 posix_acl_default_exists(struct inode *inode)
271 if (!S_ISDIR(inode->i_mode))
273 return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
277 xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
285 if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
288 if (type == ACL_TYPE_ACCESS) {
289 umode_t mode = inode->i_mode;
290 error = posix_acl_equiv_mode(acl, &mode);
299 error = xfs_set_mode(inode, mode);
305 return __xfs_set_acl(inode, type, acl);