1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4aa98d7cfSKaiGai Kohei * Copyright (C) 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 12aa98d7cfSKaiGai Kohei #include <linux/slab.h> 13aa98d7cfSKaiGai Kohei #include <linux/fs.h> 14aa98d7cfSKaiGai Kohei #include <linux/time.h> 15aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 16aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 17aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 18aa98d7cfSKaiGai Kohei #include <linux/posix_acl_xattr.h> 19aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 20aa98d7cfSKaiGai Kohei #include "nodelist.h" 21aa98d7cfSKaiGai Kohei 22aa98d7cfSKaiGai Kohei static size_t jffs2_acl_size(int count) 23aa98d7cfSKaiGai Kohei { 24aa98d7cfSKaiGai Kohei if (count <= 4) { 25de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 26de1f72faSKaiGai Kohei + count * sizeof(struct jffs2_acl_entry_short); 27aa98d7cfSKaiGai Kohei } else { 28de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 29de1f72faSKaiGai Kohei + 4 * sizeof(struct jffs2_acl_entry_short) 30de1f72faSKaiGai Kohei + (count - 4) * sizeof(struct jffs2_acl_entry); 31aa98d7cfSKaiGai Kohei } 32aa98d7cfSKaiGai Kohei } 33aa98d7cfSKaiGai Kohei 34aa98d7cfSKaiGai Kohei static int jffs2_acl_count(size_t size) 35aa98d7cfSKaiGai Kohei { 36aa98d7cfSKaiGai Kohei size_t s; 37aa98d7cfSKaiGai Kohei 38de1f72faSKaiGai Kohei size -= sizeof(struct jffs2_acl_header); 39de1f72faSKaiGai Kohei s = size - 4 * sizeof(struct jffs2_acl_entry_short); 40aa98d7cfSKaiGai Kohei if (s < 0) { 41de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 42aa98d7cfSKaiGai Kohei return -1; 43de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 44aa98d7cfSKaiGai Kohei } else { 45de1f72faSKaiGai Kohei if (s % sizeof(struct jffs2_acl_entry)) 46aa98d7cfSKaiGai Kohei return -1; 47de1f72faSKaiGai Kohei return s / sizeof(struct jffs2_acl_entry) + 4; 48aa98d7cfSKaiGai Kohei } 49aa98d7cfSKaiGai Kohei } 50aa98d7cfSKaiGai Kohei 51aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(const void *value, size_t size) 52aa98d7cfSKaiGai Kohei { 53aa98d7cfSKaiGai Kohei const char *end = (char *)value + size; 54aa98d7cfSKaiGai Kohei struct posix_acl *acl; 55aa98d7cfSKaiGai Kohei uint32_t ver; 56aa98d7cfSKaiGai Kohei int i, count; 57aa98d7cfSKaiGai Kohei 58aa98d7cfSKaiGai Kohei if (!value) 59aa98d7cfSKaiGai Kohei return NULL; 60de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 61aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 62de1f72faSKaiGai Kohei ver = je32_to_cpu(((struct jffs2_acl_header *)value)->a_version); 63aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 64aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 65aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 66aa98d7cfSKaiGai Kohei } 67aa98d7cfSKaiGai Kohei 68de1f72faSKaiGai Kohei value = (char *)value + sizeof(struct jffs2_acl_header); 69aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 70aa98d7cfSKaiGai Kohei if (count < 0) 71aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 72aa98d7cfSKaiGai Kohei if (count == 0) 73aa98d7cfSKaiGai Kohei return NULL; 74aa98d7cfSKaiGai Kohei 75aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 76aa98d7cfSKaiGai Kohei if (!acl) 77aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 78aa98d7cfSKaiGai Kohei 79aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 80de1f72faSKaiGai Kohei struct jffs2_acl_entry *entry = (struct jffs2_acl_entry *)value; 81de1f72faSKaiGai Kohei if ((char *)value + sizeof(struct jffs2_acl_entry_short) > end) 82aa98d7cfSKaiGai Kohei goto fail; 83aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 84aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 85aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 86aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 87aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 88aa98d7cfSKaiGai Kohei case ACL_MASK: 89aa98d7cfSKaiGai Kohei case ACL_OTHER: 90de1f72faSKaiGai Kohei value = (char *)value + sizeof(struct jffs2_acl_entry_short); 91aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = ACL_UNDEFINED_ID; 92aa98d7cfSKaiGai Kohei break; 93aa98d7cfSKaiGai Kohei 94aa98d7cfSKaiGai Kohei case ACL_USER: 95aa98d7cfSKaiGai Kohei case ACL_GROUP: 96de1f72faSKaiGai Kohei value = (char *)value + sizeof(struct jffs2_acl_entry); 97aa98d7cfSKaiGai Kohei if ((char *)value > end) 98aa98d7cfSKaiGai Kohei goto fail; 99aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); 100aa98d7cfSKaiGai Kohei break; 101aa98d7cfSKaiGai Kohei 102aa98d7cfSKaiGai Kohei default: 103aa98d7cfSKaiGai Kohei goto fail; 104aa98d7cfSKaiGai Kohei } 105aa98d7cfSKaiGai Kohei } 106aa98d7cfSKaiGai Kohei if (value != end) 107aa98d7cfSKaiGai Kohei goto fail; 108aa98d7cfSKaiGai Kohei return acl; 109aa98d7cfSKaiGai Kohei fail: 110aa98d7cfSKaiGai Kohei posix_acl_release(acl); 111aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 112aa98d7cfSKaiGai Kohei } 113aa98d7cfSKaiGai Kohei 114aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 115aa98d7cfSKaiGai Kohei { 116de1f72faSKaiGai Kohei struct jffs2_acl_header *jffs2_acl; 117aa98d7cfSKaiGai Kohei char *e; 118aa98d7cfSKaiGai Kohei size_t i; 119aa98d7cfSKaiGai Kohei 120aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 121de1f72faSKaiGai Kohei jffs2_acl = kmalloc(sizeof(struct jffs2_acl_header) 122de1f72faSKaiGai Kohei + acl->a_count * sizeof(struct jffs2_acl_entry), 123aa98d7cfSKaiGai Kohei GFP_KERNEL); 124aa98d7cfSKaiGai Kohei if (!jffs2_acl) 125aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 126aa98d7cfSKaiGai Kohei jffs2_acl->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 127de1f72faSKaiGai Kohei e = (char *)jffs2_acl + sizeof(struct jffs2_acl_header); 128aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 129de1f72faSKaiGai Kohei struct jffs2_acl_entry *entry = (struct jffs2_acl_entry *)e; 130aa98d7cfSKaiGai Kohei entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); 131aa98d7cfSKaiGai Kohei entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); 132aa98d7cfSKaiGai Kohei switch(acl->a_entries[i].e_tag) { 133aa98d7cfSKaiGai Kohei case ACL_USER: 134aa98d7cfSKaiGai Kohei case ACL_GROUP: 135aa98d7cfSKaiGai Kohei entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); 136de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 137aa98d7cfSKaiGai Kohei break; 138aa98d7cfSKaiGai Kohei 139aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 140aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 141aa98d7cfSKaiGai Kohei case ACL_MASK: 142aa98d7cfSKaiGai Kohei case ACL_OTHER: 143de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 144aa98d7cfSKaiGai Kohei break; 145aa98d7cfSKaiGai Kohei 146aa98d7cfSKaiGai Kohei default: 147aa98d7cfSKaiGai Kohei goto fail; 148aa98d7cfSKaiGai Kohei } 149aa98d7cfSKaiGai Kohei } 150aa98d7cfSKaiGai Kohei return (char *)jffs2_acl; 151aa98d7cfSKaiGai Kohei fail: 152aa98d7cfSKaiGai Kohei kfree(jffs2_acl); 153aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 154aa98d7cfSKaiGai Kohei } 155aa98d7cfSKaiGai Kohei 156aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl) 157aa98d7cfSKaiGai Kohei { 158aa98d7cfSKaiGai Kohei struct posix_acl *acl = JFFS2_ACL_NOT_CACHED; 159aa98d7cfSKaiGai Kohei 160aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 161aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 162aa98d7cfSKaiGai Kohei acl = posix_acl_dup(*i_acl); 163aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 164aa98d7cfSKaiGai Kohei return acl; 165aa98d7cfSKaiGai Kohei } 166aa98d7cfSKaiGai Kohei 167aa98d7cfSKaiGai Kohei static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl) 168aa98d7cfSKaiGai Kohei { 169aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 170aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 171aa98d7cfSKaiGai Kohei posix_acl_release(*i_acl); 172aa98d7cfSKaiGai Kohei *i_acl = posix_acl_dup(acl); 173aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 174aa98d7cfSKaiGai Kohei } 175aa98d7cfSKaiGai Kohei 176aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 177aa98d7cfSKaiGai Kohei { 178aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 179aa98d7cfSKaiGai Kohei struct posix_acl *acl; 180aa98d7cfSKaiGai Kohei char *value = NULL; 181aa98d7cfSKaiGai Kohei int rc, xprefix; 182aa98d7cfSKaiGai Kohei 183aa98d7cfSKaiGai Kohei switch (type) { 184aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 185aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_access); 186aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 187aa98d7cfSKaiGai Kohei return acl; 188aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 189aa98d7cfSKaiGai Kohei break; 190aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 191aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_default); 192aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 193aa98d7cfSKaiGai Kohei return acl; 194aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 195aa98d7cfSKaiGai Kohei break; 196aa98d7cfSKaiGai Kohei default: 197aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 198aa98d7cfSKaiGai Kohei } 199aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 200aa98d7cfSKaiGai Kohei if (rc > 0) { 201aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 202aa98d7cfSKaiGai Kohei if (!value) 203aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 204aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 205aa98d7cfSKaiGai Kohei } 206aa98d7cfSKaiGai Kohei if (rc > 0) { 207aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 208aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 209aa98d7cfSKaiGai Kohei acl = NULL; 210aa98d7cfSKaiGai Kohei } else { 211aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 212aa98d7cfSKaiGai Kohei } 213aa98d7cfSKaiGai Kohei if (value) 214aa98d7cfSKaiGai Kohei kfree(value); 215aa98d7cfSKaiGai Kohei if (!IS_ERR(acl)) { 216aa98d7cfSKaiGai Kohei switch (type) { 217aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 218aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 219aa98d7cfSKaiGai Kohei break; 220aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 221aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 222aa98d7cfSKaiGai Kohei break; 223aa98d7cfSKaiGai Kohei } 224aa98d7cfSKaiGai Kohei } 225aa98d7cfSKaiGai Kohei return acl; 226aa98d7cfSKaiGai Kohei } 227aa98d7cfSKaiGai Kohei 228aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 229aa98d7cfSKaiGai Kohei { 230aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 231aa98d7cfSKaiGai Kohei size_t size = 0; 232aa98d7cfSKaiGai Kohei char *value = NULL; 233aa98d7cfSKaiGai Kohei int rc, xprefix; 234aa98d7cfSKaiGai Kohei 235aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 236aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 237aa98d7cfSKaiGai Kohei 238aa98d7cfSKaiGai Kohei switch (type) { 239aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 240aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 241aa98d7cfSKaiGai Kohei if (acl) { 242aa98d7cfSKaiGai Kohei mode_t mode = inode->i_mode; 243aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 244aa98d7cfSKaiGai Kohei if (rc < 0) 245aa98d7cfSKaiGai Kohei return rc; 246aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 247aa98d7cfSKaiGai Kohei inode->i_mode = mode; 248aa98d7cfSKaiGai Kohei jffs2_dirty_inode(inode); 249aa98d7cfSKaiGai Kohei } 250aa98d7cfSKaiGai Kohei if (rc == 0) 251aa98d7cfSKaiGai Kohei acl = NULL; 252aa98d7cfSKaiGai Kohei } 253aa98d7cfSKaiGai Kohei break; 254aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 255aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 256aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 257aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 258aa98d7cfSKaiGai Kohei break; 259aa98d7cfSKaiGai Kohei default: 260aa98d7cfSKaiGai Kohei return -EINVAL; 261aa98d7cfSKaiGai Kohei } 262aa98d7cfSKaiGai Kohei if (acl) { 263aa98d7cfSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 264aa98d7cfSKaiGai Kohei if (IS_ERR(value)) 265aa98d7cfSKaiGai Kohei return PTR_ERR(value); 266aa98d7cfSKaiGai Kohei } 267aa98d7cfSKaiGai Kohei 268aa98d7cfSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 269aa98d7cfSKaiGai Kohei if (value) 270aa98d7cfSKaiGai Kohei kfree(value); 271aa98d7cfSKaiGai Kohei if (!rc) { 272aa98d7cfSKaiGai Kohei switch(type) { 273aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 274aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 275aa98d7cfSKaiGai Kohei break; 276aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 277aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 278aa98d7cfSKaiGai Kohei break; 279aa98d7cfSKaiGai Kohei } 280aa98d7cfSKaiGai Kohei } 281aa98d7cfSKaiGai Kohei return rc; 282aa98d7cfSKaiGai Kohei } 283aa98d7cfSKaiGai Kohei 284aa98d7cfSKaiGai Kohei static int jffs2_check_acl(struct inode *inode, int mask) 285aa98d7cfSKaiGai Kohei { 286aa98d7cfSKaiGai Kohei struct posix_acl *acl; 287aa98d7cfSKaiGai Kohei int rc; 288aa98d7cfSKaiGai Kohei 289aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 290aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 291aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 292aa98d7cfSKaiGai Kohei if (acl) { 293aa98d7cfSKaiGai Kohei rc = posix_acl_permission(inode, acl, mask); 294aa98d7cfSKaiGai Kohei posix_acl_release(acl); 295aa98d7cfSKaiGai Kohei return rc; 296aa98d7cfSKaiGai Kohei } 297aa98d7cfSKaiGai Kohei return -EAGAIN; 298aa98d7cfSKaiGai Kohei } 299aa98d7cfSKaiGai Kohei 300aa98d7cfSKaiGai Kohei int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd) 301aa98d7cfSKaiGai Kohei { 302aa98d7cfSKaiGai Kohei return generic_permission(inode, mask, jffs2_check_acl); 303aa98d7cfSKaiGai Kohei } 304aa98d7cfSKaiGai Kohei 305aa98d7cfSKaiGai Kohei int jffs2_init_acl(struct inode *inode, struct inode *dir) 306aa98d7cfSKaiGai Kohei { 307aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 308aa98d7cfSKaiGai Kohei struct posix_acl *acl = NULL, *clone; 309aa98d7cfSKaiGai Kohei mode_t mode; 310aa98d7cfSKaiGai Kohei int rc = 0; 311aa98d7cfSKaiGai Kohei 312aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 313aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 314aa98d7cfSKaiGai Kohei if (!S_ISLNK(inode->i_mode)) { 315aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(dir, ACL_TYPE_DEFAULT); 316aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 317aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 318aa98d7cfSKaiGai Kohei if (!acl) 319aa98d7cfSKaiGai Kohei inode->i_mode &= ~current->fs->umask; 320aa98d7cfSKaiGai Kohei } 321aa98d7cfSKaiGai Kohei if (acl) { 322aa98d7cfSKaiGai Kohei if (S_ISDIR(inode->i_mode)) { 323aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl); 324aa98d7cfSKaiGai Kohei if (rc) 325aa98d7cfSKaiGai Kohei goto cleanup; 326aa98d7cfSKaiGai Kohei } 327aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 328aa98d7cfSKaiGai Kohei rc = -ENOMEM; 329aa98d7cfSKaiGai Kohei if (!clone) 330aa98d7cfSKaiGai Kohei goto cleanup; 331aa98d7cfSKaiGai Kohei mode = inode->i_mode; 332aa98d7cfSKaiGai Kohei rc = posix_acl_create_masq(clone, &mode); 333aa98d7cfSKaiGai Kohei if (rc >= 0) { 334aa98d7cfSKaiGai Kohei inode->i_mode = mode; 335aa98d7cfSKaiGai Kohei if (rc > 0) 336aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 337aa98d7cfSKaiGai Kohei } 338aa98d7cfSKaiGai Kohei posix_acl_release(clone); 339aa98d7cfSKaiGai Kohei } 340aa98d7cfSKaiGai Kohei cleanup: 341aa98d7cfSKaiGai Kohei posix_acl_release(acl); 342aa98d7cfSKaiGai Kohei return rc; 343aa98d7cfSKaiGai Kohei } 344aa98d7cfSKaiGai Kohei 345aa98d7cfSKaiGai Kohei void jffs2_clear_acl(struct inode *inode) 346aa98d7cfSKaiGai Kohei { 347aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 348aa98d7cfSKaiGai Kohei 349aa98d7cfSKaiGai Kohei if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) { 350aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_access); 351aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 352aa98d7cfSKaiGai Kohei } 353aa98d7cfSKaiGai Kohei if (f->i_acl_default && f->i_acl_default != JFFS2_ACL_NOT_CACHED) { 354aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_default); 355aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 356aa98d7cfSKaiGai Kohei } 357aa98d7cfSKaiGai Kohei } 358aa98d7cfSKaiGai Kohei 359aa98d7cfSKaiGai Kohei int jffs2_acl_chmod(struct inode *inode) 360aa98d7cfSKaiGai Kohei { 361aa98d7cfSKaiGai Kohei struct posix_acl *acl, *clone; 362aa98d7cfSKaiGai Kohei int rc; 363aa98d7cfSKaiGai Kohei 364aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 365aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 366aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 367aa98d7cfSKaiGai Kohei if (IS_ERR(acl) || !acl) 368aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 369aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 370aa98d7cfSKaiGai Kohei posix_acl_release(acl); 371aa98d7cfSKaiGai Kohei if (!clone) 372aa98d7cfSKaiGai Kohei return -ENOMEM; 373aa98d7cfSKaiGai Kohei rc = posix_acl_chmod_masq(clone, inode->i_mode); 374aa98d7cfSKaiGai Kohei if (!rc) 375aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 376aa98d7cfSKaiGai Kohei posix_acl_release(clone); 377aa98d7cfSKaiGai Kohei return rc; 378aa98d7cfSKaiGai Kohei } 379aa98d7cfSKaiGai Kohei 380aa98d7cfSKaiGai Kohei static size_t jffs2_acl_access_listxattr(struct inode *inode, char *list, size_t list_size, 381aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 382aa98d7cfSKaiGai Kohei { 383aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); 384aa98d7cfSKaiGai Kohei 385aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 386aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_ACCESS); 387aa98d7cfSKaiGai Kohei return retlen; 388aa98d7cfSKaiGai Kohei } 389aa98d7cfSKaiGai Kohei 390aa98d7cfSKaiGai Kohei static size_t jffs2_acl_default_listxattr(struct inode *inode, char *list, size_t list_size, 391aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 392aa98d7cfSKaiGai Kohei { 393aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); 394aa98d7cfSKaiGai Kohei 395aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 396aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_DEFAULT); 397aa98d7cfSKaiGai Kohei return retlen; 398aa98d7cfSKaiGai Kohei } 399aa98d7cfSKaiGai Kohei 400aa98d7cfSKaiGai Kohei static int jffs2_acl_getxattr(struct inode *inode, int type, void *buffer, size_t size) 401aa98d7cfSKaiGai Kohei { 402aa98d7cfSKaiGai Kohei struct posix_acl *acl; 403aa98d7cfSKaiGai Kohei int rc; 404aa98d7cfSKaiGai Kohei 405aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, type); 406aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 407aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 408aa98d7cfSKaiGai Kohei if (!acl) 409aa98d7cfSKaiGai Kohei return -ENODATA; 410aa98d7cfSKaiGai Kohei rc = posix_acl_to_xattr(acl, buffer, size); 411aa98d7cfSKaiGai Kohei posix_acl_release(acl); 412aa98d7cfSKaiGai Kohei 413aa98d7cfSKaiGai Kohei return rc; 414aa98d7cfSKaiGai Kohei } 415aa98d7cfSKaiGai Kohei 416aa98d7cfSKaiGai Kohei static int jffs2_acl_access_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 417aa98d7cfSKaiGai Kohei { 418aa98d7cfSKaiGai Kohei if (name[0] != '\0') 419aa98d7cfSKaiGai Kohei return -EINVAL; 420aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_ACCESS, buffer, size); 421aa98d7cfSKaiGai Kohei } 422aa98d7cfSKaiGai Kohei 423aa98d7cfSKaiGai Kohei static int jffs2_acl_default_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 424aa98d7cfSKaiGai Kohei { 425aa98d7cfSKaiGai Kohei if (name[0] != '\0') 426aa98d7cfSKaiGai Kohei return -EINVAL; 427aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 428aa98d7cfSKaiGai Kohei } 429aa98d7cfSKaiGai Kohei 430aa98d7cfSKaiGai Kohei static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value, size_t size) 431aa98d7cfSKaiGai Kohei { 432aa98d7cfSKaiGai Kohei struct posix_acl *acl; 433aa98d7cfSKaiGai Kohei int rc; 434aa98d7cfSKaiGai Kohei 435aa98d7cfSKaiGai Kohei if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 436aa98d7cfSKaiGai Kohei return -EPERM; 437aa98d7cfSKaiGai Kohei 438aa98d7cfSKaiGai Kohei if (value) { 439aa98d7cfSKaiGai Kohei acl = posix_acl_from_xattr(value, size); 440aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 441aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 442aa98d7cfSKaiGai Kohei if (acl) { 443aa98d7cfSKaiGai Kohei rc = posix_acl_valid(acl); 444aa98d7cfSKaiGai Kohei if (rc) 445aa98d7cfSKaiGai Kohei goto out; 446aa98d7cfSKaiGai Kohei } 447aa98d7cfSKaiGai Kohei } else { 448aa98d7cfSKaiGai Kohei acl = NULL; 449aa98d7cfSKaiGai Kohei } 450aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, type, acl); 451aa98d7cfSKaiGai Kohei out: 452aa98d7cfSKaiGai Kohei posix_acl_release(acl); 453aa98d7cfSKaiGai Kohei return rc; 454aa98d7cfSKaiGai Kohei } 455aa98d7cfSKaiGai Kohei 456aa98d7cfSKaiGai Kohei static int jffs2_acl_access_setxattr(struct inode *inode, const char *name, 457aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 458aa98d7cfSKaiGai Kohei { 459aa98d7cfSKaiGai Kohei if (name[0] != '\0') 460aa98d7cfSKaiGai Kohei return -EINVAL; 461aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_ACCESS, buffer, size); 462aa98d7cfSKaiGai Kohei } 463aa98d7cfSKaiGai Kohei 464aa98d7cfSKaiGai Kohei static int jffs2_acl_default_setxattr(struct inode *inode, const char *name, 465aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 466aa98d7cfSKaiGai Kohei { 467aa98d7cfSKaiGai Kohei if (name[0] != '\0') 468aa98d7cfSKaiGai Kohei return -EINVAL; 469aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 470aa98d7cfSKaiGai Kohei } 471aa98d7cfSKaiGai Kohei 472aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_access_xattr_handler = { 473aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_ACCESS, 474aa98d7cfSKaiGai Kohei .list = jffs2_acl_access_listxattr, 475aa98d7cfSKaiGai Kohei .get = jffs2_acl_access_getxattr, 476aa98d7cfSKaiGai Kohei .set = jffs2_acl_access_setxattr, 477aa98d7cfSKaiGai Kohei }; 478aa98d7cfSKaiGai Kohei 479aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_default_xattr_handler = { 480aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_DEFAULT, 481aa98d7cfSKaiGai Kohei .list = jffs2_acl_default_listxattr, 482aa98d7cfSKaiGai Kohei .get = jffs2_acl_default_getxattr, 483aa98d7cfSKaiGai Kohei .set = jffs2_acl_default_setxattr, 484aa98d7cfSKaiGai Kohei }; 485