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 51dea80134SKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) 52aa98d7cfSKaiGai Kohei { 53dea80134SKaiGai Kohei void *end = value + size; 54dea80134SKaiGai Kohei struct jffs2_acl_header *header = value; 55dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 56aa98d7cfSKaiGai Kohei struct posix_acl *acl; 57aa98d7cfSKaiGai Kohei uint32_t ver; 58aa98d7cfSKaiGai Kohei int i, count; 59aa98d7cfSKaiGai Kohei 60aa98d7cfSKaiGai Kohei if (!value) 61aa98d7cfSKaiGai Kohei return NULL; 62de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 63aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 64dea80134SKaiGai Kohei ver = je32_to_cpu(header->a_version); 65aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 66aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 67aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 68aa98d7cfSKaiGai Kohei } 69aa98d7cfSKaiGai Kohei 70dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_header); 71aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 72aa98d7cfSKaiGai Kohei if (count < 0) 73aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 74aa98d7cfSKaiGai Kohei if (count == 0) 75aa98d7cfSKaiGai Kohei return NULL; 76aa98d7cfSKaiGai Kohei 77aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 78aa98d7cfSKaiGai Kohei if (!acl) 79aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 80aa98d7cfSKaiGai Kohei 81aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 82dea80134SKaiGai Kohei entry = value; 83dea80134SKaiGai Kohei if (value + sizeof(struct jffs2_acl_entry_short) > end) 84aa98d7cfSKaiGai Kohei goto fail; 85aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 86aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 87aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 88aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 89aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 90aa98d7cfSKaiGai Kohei case ACL_MASK: 91aa98d7cfSKaiGai Kohei case ACL_OTHER: 92dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry_short); 93aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = ACL_UNDEFINED_ID; 94aa98d7cfSKaiGai Kohei break; 95aa98d7cfSKaiGai Kohei 96aa98d7cfSKaiGai Kohei case ACL_USER: 97aa98d7cfSKaiGai Kohei case ACL_GROUP: 98dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry); 99dea80134SKaiGai Kohei if (value > end) 100aa98d7cfSKaiGai Kohei goto fail; 101aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); 102aa98d7cfSKaiGai Kohei break; 103aa98d7cfSKaiGai Kohei 104aa98d7cfSKaiGai Kohei default: 105aa98d7cfSKaiGai Kohei goto fail; 106aa98d7cfSKaiGai Kohei } 107aa98d7cfSKaiGai Kohei } 108aa98d7cfSKaiGai Kohei if (value != end) 109aa98d7cfSKaiGai Kohei goto fail; 110aa98d7cfSKaiGai Kohei return acl; 111aa98d7cfSKaiGai Kohei fail: 112aa98d7cfSKaiGai Kohei posix_acl_release(acl); 113aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 114aa98d7cfSKaiGai Kohei } 115aa98d7cfSKaiGai Kohei 116aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 117aa98d7cfSKaiGai Kohei { 118dea80134SKaiGai Kohei struct jffs2_acl_header *header; 119dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 120dea80134SKaiGai Kohei void *e; 121aa98d7cfSKaiGai Kohei size_t i; 122aa98d7cfSKaiGai Kohei 123aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 124dea80134SKaiGai Kohei header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); 125dea80134SKaiGai Kohei if (!header) 126aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 127dea80134SKaiGai Kohei header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 128dea80134SKaiGai Kohei e = header + 1; 129aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 130dea80134SKaiGai Kohei entry = e; 131aa98d7cfSKaiGai Kohei entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); 132aa98d7cfSKaiGai Kohei entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); 133aa98d7cfSKaiGai Kohei switch(acl->a_entries[i].e_tag) { 134aa98d7cfSKaiGai Kohei case ACL_USER: 135aa98d7cfSKaiGai Kohei case ACL_GROUP: 136aa98d7cfSKaiGai Kohei entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); 137de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 138aa98d7cfSKaiGai Kohei break; 139aa98d7cfSKaiGai Kohei 140aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 141aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 142aa98d7cfSKaiGai Kohei case ACL_MASK: 143aa98d7cfSKaiGai Kohei case ACL_OTHER: 144de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 145aa98d7cfSKaiGai Kohei break; 146aa98d7cfSKaiGai Kohei 147aa98d7cfSKaiGai Kohei default: 148aa98d7cfSKaiGai Kohei goto fail; 149aa98d7cfSKaiGai Kohei } 150aa98d7cfSKaiGai Kohei } 151dea80134SKaiGai Kohei return header; 152aa98d7cfSKaiGai Kohei fail: 153dea80134SKaiGai Kohei kfree(header); 154aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 155aa98d7cfSKaiGai Kohei } 156aa98d7cfSKaiGai Kohei 157aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl) 158aa98d7cfSKaiGai Kohei { 159aa98d7cfSKaiGai Kohei struct posix_acl *acl = JFFS2_ACL_NOT_CACHED; 160aa98d7cfSKaiGai Kohei 161aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 162aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 163aa98d7cfSKaiGai Kohei acl = posix_acl_dup(*i_acl); 164aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 165aa98d7cfSKaiGai Kohei return acl; 166aa98d7cfSKaiGai Kohei } 167aa98d7cfSKaiGai Kohei 168aa98d7cfSKaiGai Kohei static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl) 169aa98d7cfSKaiGai Kohei { 170aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 171aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 172aa98d7cfSKaiGai Kohei posix_acl_release(*i_acl); 173aa98d7cfSKaiGai Kohei *i_acl = posix_acl_dup(acl); 174aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 175aa98d7cfSKaiGai Kohei } 176aa98d7cfSKaiGai Kohei 177aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 178aa98d7cfSKaiGai Kohei { 179aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 180aa98d7cfSKaiGai Kohei struct posix_acl *acl; 181aa98d7cfSKaiGai Kohei char *value = NULL; 182aa98d7cfSKaiGai Kohei int rc, xprefix; 183aa98d7cfSKaiGai Kohei 184aa98d7cfSKaiGai Kohei switch (type) { 185aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 186aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_access); 187aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 188aa98d7cfSKaiGai Kohei return acl; 189aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 190aa98d7cfSKaiGai Kohei break; 191aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 192aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_default); 193aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 194aa98d7cfSKaiGai Kohei return acl; 195aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 196aa98d7cfSKaiGai Kohei break; 197aa98d7cfSKaiGai Kohei default: 198aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 199aa98d7cfSKaiGai Kohei } 200aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 201aa98d7cfSKaiGai Kohei if (rc > 0) { 202aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 203aa98d7cfSKaiGai Kohei if (!value) 204aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 205aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 206aa98d7cfSKaiGai Kohei } 207aa98d7cfSKaiGai Kohei if (rc > 0) { 208aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 209aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 210aa98d7cfSKaiGai Kohei acl = NULL; 211aa98d7cfSKaiGai Kohei } else { 212aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 213aa98d7cfSKaiGai Kohei } 214aa98d7cfSKaiGai Kohei if (value) 215aa98d7cfSKaiGai Kohei kfree(value); 216aa98d7cfSKaiGai Kohei if (!IS_ERR(acl)) { 217aa98d7cfSKaiGai Kohei switch (type) { 218aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 219aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 220aa98d7cfSKaiGai Kohei break; 221aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 222aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 223aa98d7cfSKaiGai Kohei break; 224aa98d7cfSKaiGai Kohei } 225aa98d7cfSKaiGai Kohei } 226aa98d7cfSKaiGai Kohei return acl; 227aa98d7cfSKaiGai Kohei } 228aa98d7cfSKaiGai Kohei 229aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 230aa98d7cfSKaiGai Kohei { 231aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 232aa98d7cfSKaiGai Kohei size_t size = 0; 233aa98d7cfSKaiGai Kohei char *value = NULL; 234aa98d7cfSKaiGai Kohei int rc, xprefix; 235aa98d7cfSKaiGai Kohei 236aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 237aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 238aa98d7cfSKaiGai Kohei 239aa98d7cfSKaiGai Kohei switch (type) { 240aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 241aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 242aa98d7cfSKaiGai Kohei if (acl) { 243aa98d7cfSKaiGai Kohei mode_t mode = inode->i_mode; 244aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 245aa98d7cfSKaiGai Kohei if (rc < 0) 246aa98d7cfSKaiGai Kohei return rc; 247aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 248aa98d7cfSKaiGai Kohei inode->i_mode = mode; 249aa98d7cfSKaiGai Kohei jffs2_dirty_inode(inode); 250aa98d7cfSKaiGai Kohei } 251aa98d7cfSKaiGai Kohei if (rc == 0) 252aa98d7cfSKaiGai Kohei acl = NULL; 253aa98d7cfSKaiGai Kohei } 254aa98d7cfSKaiGai Kohei break; 255aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 256aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 257aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 258aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 259aa98d7cfSKaiGai Kohei break; 260aa98d7cfSKaiGai Kohei default: 261aa98d7cfSKaiGai Kohei return -EINVAL; 262aa98d7cfSKaiGai Kohei } 263aa98d7cfSKaiGai Kohei if (acl) { 264aa98d7cfSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 265aa98d7cfSKaiGai Kohei if (IS_ERR(value)) 266aa98d7cfSKaiGai Kohei return PTR_ERR(value); 267aa98d7cfSKaiGai Kohei } 268aa98d7cfSKaiGai Kohei 269aa98d7cfSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 270a1ae76e9SKaiGai Kohei if (!value && rc == -ENODATA) 271a1ae76e9SKaiGai Kohei rc = 0; 272aa98d7cfSKaiGai Kohei if (value) 273aa98d7cfSKaiGai Kohei kfree(value); 274aa98d7cfSKaiGai Kohei if (!rc) { 275aa98d7cfSKaiGai Kohei switch(type) { 276aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 277aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 278aa98d7cfSKaiGai Kohei break; 279aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 280aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 281aa98d7cfSKaiGai Kohei break; 282aa98d7cfSKaiGai Kohei } 283aa98d7cfSKaiGai Kohei } 284aa98d7cfSKaiGai Kohei return rc; 285aa98d7cfSKaiGai Kohei } 286aa98d7cfSKaiGai Kohei 287aa98d7cfSKaiGai Kohei static int jffs2_check_acl(struct inode *inode, int mask) 288aa98d7cfSKaiGai Kohei { 289aa98d7cfSKaiGai Kohei struct posix_acl *acl; 290aa98d7cfSKaiGai Kohei int rc; 291aa98d7cfSKaiGai Kohei 292aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 293aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 294aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 295aa98d7cfSKaiGai Kohei if (acl) { 296aa98d7cfSKaiGai Kohei rc = posix_acl_permission(inode, acl, mask); 297aa98d7cfSKaiGai Kohei posix_acl_release(acl); 298aa98d7cfSKaiGai Kohei return rc; 299aa98d7cfSKaiGai Kohei } 300aa98d7cfSKaiGai Kohei return -EAGAIN; 301aa98d7cfSKaiGai Kohei } 302aa98d7cfSKaiGai Kohei 303aa98d7cfSKaiGai Kohei int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd) 304aa98d7cfSKaiGai Kohei { 305aa98d7cfSKaiGai Kohei return generic_permission(inode, mask, jffs2_check_acl); 306aa98d7cfSKaiGai Kohei } 307aa98d7cfSKaiGai Kohei 308aa98d7cfSKaiGai Kohei int jffs2_init_acl(struct inode *inode, struct inode *dir) 309aa98d7cfSKaiGai Kohei { 310aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 311aa98d7cfSKaiGai Kohei struct posix_acl *acl = NULL, *clone; 312aa98d7cfSKaiGai Kohei mode_t mode; 313aa98d7cfSKaiGai Kohei int rc = 0; 314aa98d7cfSKaiGai Kohei 315aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 316aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 317aa98d7cfSKaiGai Kohei if (!S_ISLNK(inode->i_mode)) { 318aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(dir, ACL_TYPE_DEFAULT); 319aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 320aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 321aa98d7cfSKaiGai Kohei if (!acl) 322aa98d7cfSKaiGai Kohei inode->i_mode &= ~current->fs->umask; 323aa98d7cfSKaiGai Kohei } 324aa98d7cfSKaiGai Kohei if (acl) { 325aa98d7cfSKaiGai Kohei if (S_ISDIR(inode->i_mode)) { 326aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl); 327aa98d7cfSKaiGai Kohei if (rc) 328aa98d7cfSKaiGai Kohei goto cleanup; 329aa98d7cfSKaiGai Kohei } 330aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 331aa98d7cfSKaiGai Kohei rc = -ENOMEM; 332aa98d7cfSKaiGai Kohei if (!clone) 333aa98d7cfSKaiGai Kohei goto cleanup; 334aa98d7cfSKaiGai Kohei mode = inode->i_mode; 335aa98d7cfSKaiGai Kohei rc = posix_acl_create_masq(clone, &mode); 336aa98d7cfSKaiGai Kohei if (rc >= 0) { 337aa98d7cfSKaiGai Kohei inode->i_mode = mode; 338aa98d7cfSKaiGai Kohei if (rc > 0) 339aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 340aa98d7cfSKaiGai Kohei } 341aa98d7cfSKaiGai Kohei posix_acl_release(clone); 342aa98d7cfSKaiGai Kohei } 343aa98d7cfSKaiGai Kohei cleanup: 344aa98d7cfSKaiGai Kohei posix_acl_release(acl); 345aa98d7cfSKaiGai Kohei return rc; 346aa98d7cfSKaiGai Kohei } 347aa98d7cfSKaiGai Kohei 348aa98d7cfSKaiGai Kohei void jffs2_clear_acl(struct inode *inode) 349aa98d7cfSKaiGai Kohei { 350aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 351aa98d7cfSKaiGai Kohei 352aa98d7cfSKaiGai Kohei if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) { 353aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_access); 354aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 355aa98d7cfSKaiGai Kohei } 356aa98d7cfSKaiGai Kohei if (f->i_acl_default && f->i_acl_default != JFFS2_ACL_NOT_CACHED) { 357aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_default); 358aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 359aa98d7cfSKaiGai Kohei } 360aa98d7cfSKaiGai Kohei } 361aa98d7cfSKaiGai Kohei 362aa98d7cfSKaiGai Kohei int jffs2_acl_chmod(struct inode *inode) 363aa98d7cfSKaiGai Kohei { 364aa98d7cfSKaiGai Kohei struct posix_acl *acl, *clone; 365aa98d7cfSKaiGai Kohei int rc; 366aa98d7cfSKaiGai Kohei 367aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 368aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 369aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 370aa98d7cfSKaiGai Kohei if (IS_ERR(acl) || !acl) 371aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 372aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 373aa98d7cfSKaiGai Kohei posix_acl_release(acl); 374aa98d7cfSKaiGai Kohei if (!clone) 375aa98d7cfSKaiGai Kohei return -ENOMEM; 376aa98d7cfSKaiGai Kohei rc = posix_acl_chmod_masq(clone, inode->i_mode); 377aa98d7cfSKaiGai Kohei if (!rc) 378aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 379aa98d7cfSKaiGai Kohei posix_acl_release(clone); 380aa98d7cfSKaiGai Kohei return rc; 381aa98d7cfSKaiGai Kohei } 382aa98d7cfSKaiGai Kohei 383aa98d7cfSKaiGai Kohei static size_t jffs2_acl_access_listxattr(struct inode *inode, char *list, size_t list_size, 384aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 385aa98d7cfSKaiGai Kohei { 386aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); 387aa98d7cfSKaiGai Kohei 388aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 389aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_ACCESS); 390aa98d7cfSKaiGai Kohei return retlen; 391aa98d7cfSKaiGai Kohei } 392aa98d7cfSKaiGai Kohei 393aa98d7cfSKaiGai Kohei static size_t jffs2_acl_default_listxattr(struct inode *inode, char *list, size_t list_size, 394aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 395aa98d7cfSKaiGai Kohei { 396aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); 397aa98d7cfSKaiGai Kohei 398aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 399aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_DEFAULT); 400aa98d7cfSKaiGai Kohei return retlen; 401aa98d7cfSKaiGai Kohei } 402aa98d7cfSKaiGai Kohei 403aa98d7cfSKaiGai Kohei static int jffs2_acl_getxattr(struct inode *inode, int type, void *buffer, size_t size) 404aa98d7cfSKaiGai Kohei { 405aa98d7cfSKaiGai Kohei struct posix_acl *acl; 406aa98d7cfSKaiGai Kohei int rc; 407aa98d7cfSKaiGai Kohei 408aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, type); 409aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 410aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 411aa98d7cfSKaiGai Kohei if (!acl) 412aa98d7cfSKaiGai Kohei return -ENODATA; 413aa98d7cfSKaiGai Kohei rc = posix_acl_to_xattr(acl, buffer, size); 414aa98d7cfSKaiGai Kohei posix_acl_release(acl); 415aa98d7cfSKaiGai Kohei 416aa98d7cfSKaiGai Kohei return rc; 417aa98d7cfSKaiGai Kohei } 418aa98d7cfSKaiGai Kohei 419aa98d7cfSKaiGai Kohei static int jffs2_acl_access_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 420aa98d7cfSKaiGai Kohei { 421aa98d7cfSKaiGai Kohei if (name[0] != '\0') 422aa98d7cfSKaiGai Kohei return -EINVAL; 423aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_ACCESS, buffer, size); 424aa98d7cfSKaiGai Kohei } 425aa98d7cfSKaiGai Kohei 426aa98d7cfSKaiGai Kohei static int jffs2_acl_default_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 427aa98d7cfSKaiGai Kohei { 428aa98d7cfSKaiGai Kohei if (name[0] != '\0') 429aa98d7cfSKaiGai Kohei return -EINVAL; 430aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 431aa98d7cfSKaiGai Kohei } 432aa98d7cfSKaiGai Kohei 433aa98d7cfSKaiGai Kohei static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value, size_t size) 434aa98d7cfSKaiGai Kohei { 435aa98d7cfSKaiGai Kohei struct posix_acl *acl; 436aa98d7cfSKaiGai Kohei int rc; 437aa98d7cfSKaiGai Kohei 438aa98d7cfSKaiGai Kohei if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 439aa98d7cfSKaiGai Kohei return -EPERM; 440aa98d7cfSKaiGai Kohei 441aa98d7cfSKaiGai Kohei if (value) { 442aa98d7cfSKaiGai Kohei acl = posix_acl_from_xattr(value, size); 443aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 444aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 445aa98d7cfSKaiGai Kohei if (acl) { 446aa98d7cfSKaiGai Kohei rc = posix_acl_valid(acl); 447aa98d7cfSKaiGai Kohei if (rc) 448aa98d7cfSKaiGai Kohei goto out; 449aa98d7cfSKaiGai Kohei } 450aa98d7cfSKaiGai Kohei } else { 451aa98d7cfSKaiGai Kohei acl = NULL; 452aa98d7cfSKaiGai Kohei } 453aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, type, acl); 454aa98d7cfSKaiGai Kohei out: 455aa98d7cfSKaiGai Kohei posix_acl_release(acl); 456aa98d7cfSKaiGai Kohei return rc; 457aa98d7cfSKaiGai Kohei } 458aa98d7cfSKaiGai Kohei 459aa98d7cfSKaiGai Kohei static int jffs2_acl_access_setxattr(struct inode *inode, const char *name, 460aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 461aa98d7cfSKaiGai Kohei { 462aa98d7cfSKaiGai Kohei if (name[0] != '\0') 463aa98d7cfSKaiGai Kohei return -EINVAL; 464aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_ACCESS, buffer, size); 465aa98d7cfSKaiGai Kohei } 466aa98d7cfSKaiGai Kohei 467aa98d7cfSKaiGai Kohei static int jffs2_acl_default_setxattr(struct inode *inode, const char *name, 468aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 469aa98d7cfSKaiGai Kohei { 470aa98d7cfSKaiGai Kohei if (name[0] != '\0') 471aa98d7cfSKaiGai Kohei return -EINVAL; 472aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 473aa98d7cfSKaiGai Kohei } 474aa98d7cfSKaiGai Kohei 475aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_access_xattr_handler = { 476aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_ACCESS, 477aa98d7cfSKaiGai Kohei .list = jffs2_acl_access_listxattr, 478aa98d7cfSKaiGai Kohei .get = jffs2_acl_access_getxattr, 479aa98d7cfSKaiGai Kohei .set = jffs2_acl_access_setxattr, 480aa98d7cfSKaiGai Kohei }; 481aa98d7cfSKaiGai Kohei 482aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_default_xattr_handler = { 483aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_DEFAULT, 484aa98d7cfSKaiGai Kohei .list = jffs2_acl_default_listxattr, 485aa98d7cfSKaiGai Kohei .get = jffs2_acl_default_getxattr, 486aa98d7cfSKaiGai Kohei .set = jffs2_acl_default_setxattr, 487aa98d7cfSKaiGai Kohei }; 488