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"
23 #include "xfs_mount.h"
24 #include "xfs_inode.h"
27 #include "xfs_trace.h"
28 #include <linux/slab.h>
29 #include <linux/xattr.h>
30 #include <linux/posix_acl_xattr.h>
35 * - all ACL updates are protected by inode->i_mutex, which is taken before
36 * calling into this file.
39 STATIC struct posix_acl *
44 struct posix_acl_entry *acl_e;
45 struct posix_acl *acl;
46 struct xfs_acl_entry *ace;
47 unsigned int count, i;
49 count = be32_to_cpu(aclp->acl_cnt);
50 if (count > max_entries)
51 return ERR_PTR(-EFSCORRUPTED);
53 acl = posix_acl_alloc(count, GFP_KERNEL);
55 return ERR_PTR(-ENOMEM);
57 for (i = 0; i < count; i++) {
58 acl_e = &acl->a_entries[i];
59 ace = &aclp->acl_entry[i];
62 * The tag is 32 bits on disk and 16 bits in core.
64 * Because every access to it goes through the core
65 * format first this is not a problem.
67 acl_e->e_tag = be32_to_cpu(ace->ae_tag);
68 acl_e->e_perm = be16_to_cpu(ace->ae_perm);
70 switch (acl_e->e_tag) {
72 acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
75 acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
89 posix_acl_release(acl);
90 return ERR_PTR(-EINVAL);
94 xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
96 const struct posix_acl_entry *acl_e;
97 struct xfs_acl_entry *ace;
100 aclp->acl_cnt = cpu_to_be32(acl->a_count);
101 for (i = 0; i < acl->a_count; i++) {
102 ace = &aclp->acl_entry[i];
103 acl_e = &acl->a_entries[i];
105 ace->ae_tag = cpu_to_be32(acl_e->e_tag);
106 switch (acl_e->e_tag) {
108 ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
111 ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
114 ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
118 ace->ae_perm = cpu_to_be16(acl_e->e_perm);
123 xfs_get_acl(struct inode *inode, int type)
125 struct xfs_inode *ip = XFS_I(inode);
126 struct posix_acl *acl = NULL;
127 struct xfs_acl *xfs_acl;
128 unsigned char *ea_name;
132 trace_xfs_get_acl(ip);
135 case ACL_TYPE_ACCESS:
136 ea_name = SGI_ACL_FILE;
138 case ACL_TYPE_DEFAULT:
139 ea_name = SGI_ACL_DEFAULT;
146 * If we have a cached ACLs value just return it, not need to
147 * go out to the disk.
149 len = XFS_ACL_MAX_SIZE(ip->i_mount);
150 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
152 return ERR_PTR(-ENOMEM);
154 error = xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
158 * If the attribute doesn't exist make sure we have a negative
159 * cache entry, for any other error assume it is transient and
160 * leave the cache entry as ACL_NOT_CACHED.
162 if (error == -ENOATTR)
163 goto out_update_cache;
167 acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
172 set_cached_acl(inode, type, acl);
179 __xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
181 struct xfs_inode *ip = XFS_I(inode);
182 unsigned char *ea_name;
186 case ACL_TYPE_ACCESS:
187 ea_name = SGI_ACL_FILE;
189 case ACL_TYPE_DEFAULT:
190 if (!S_ISDIR(inode->i_mode))
191 return acl ? -EACCES : 0;
192 ea_name = SGI_ACL_DEFAULT;
199 struct xfs_acl *xfs_acl;
200 int len = XFS_ACL_MAX_SIZE(ip->i_mount);
202 xfs_acl = kmem_zalloc_large(len, KM_SLEEP);
206 xfs_acl_to_disk(xfs_acl, acl);
208 /* subtract away the unused acl entries */
209 len -= sizeof(struct xfs_acl_entry) *
210 (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
212 error = xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
218 * A NULL ACL argument means we want to remove the ACL.
220 error = xfs_attr_remove(ip, ea_name, ATTR_ROOT);
223 * If the attribute didn't exist to start with that's fine.
225 if (error == -ENOATTR)
230 set_cached_acl(inode, type, acl);
235 xfs_set_mode(struct inode *inode, umode_t mode)
239 if (mode != inode->i_mode) {
242 iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
243 iattr.ia_mode = mode;
244 iattr.ia_ctime = current_fs_time(inode->i_sb);
246 error = xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
253 xfs_acl_exists(struct inode *inode, unsigned char *name)
255 int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));
257 return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
258 ATTR_ROOT|ATTR_KERNOVAL) == 0);
262 posix_acl_access_exists(struct inode *inode)
264 return xfs_acl_exists(inode, SGI_ACL_FILE);
268 posix_acl_default_exists(struct inode *inode)
270 if (!S_ISDIR(inode->i_mode))
272 return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
276 xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
284 if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
287 if (type == ACL_TYPE_ACCESS) {
288 umode_t mode = inode->i_mode;
289 error = posix_acl_equiv_mode(acl, &mode);
298 error = xfs_set_mode(inode, mode);
304 return __xfs_set_acl(inode, type, acl);