1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4c00c310eSDavid Woodhouse * Copyright © 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 */ 11c00c310eSDavid Woodhouse 12aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 13aa98d7cfSKaiGai Kohei #include <linux/slab.h> 14aa98d7cfSKaiGai Kohei #include <linux/fs.h> 15914e2637SAl Viro #include <linux/sched.h> 16aa98d7cfSKaiGai Kohei #include <linux/time.h> 17aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 18aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 19aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 20aa98d7cfSKaiGai Kohei #include <linux/posix_acl_xattr.h> 21aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 22aa98d7cfSKaiGai Kohei #include "nodelist.h" 23aa98d7cfSKaiGai Kohei 24aa98d7cfSKaiGai Kohei static size_t jffs2_acl_size(int count) 25aa98d7cfSKaiGai Kohei { 26aa98d7cfSKaiGai Kohei if (count <= 4) { 27de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 28de1f72faSKaiGai Kohei + count * sizeof(struct jffs2_acl_entry_short); 29aa98d7cfSKaiGai Kohei } else { 30de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 31de1f72faSKaiGai Kohei + 4 * sizeof(struct jffs2_acl_entry_short) 32de1f72faSKaiGai Kohei + (count - 4) * sizeof(struct jffs2_acl_entry); 33aa98d7cfSKaiGai Kohei } 34aa98d7cfSKaiGai Kohei } 35aa98d7cfSKaiGai Kohei 36aa98d7cfSKaiGai Kohei static int jffs2_acl_count(size_t size) 37aa98d7cfSKaiGai Kohei { 38aa98d7cfSKaiGai Kohei size_t s; 39aa98d7cfSKaiGai Kohei 40de1f72faSKaiGai Kohei size -= sizeof(struct jffs2_acl_header); 41de1f72faSKaiGai Kohei s = size - 4 * sizeof(struct jffs2_acl_entry_short); 42aa98d7cfSKaiGai Kohei if (s < 0) { 43de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 44aa98d7cfSKaiGai Kohei return -1; 45de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 46aa98d7cfSKaiGai Kohei } else { 47de1f72faSKaiGai Kohei if (s % sizeof(struct jffs2_acl_entry)) 48aa98d7cfSKaiGai Kohei return -1; 49de1f72faSKaiGai Kohei return s / sizeof(struct jffs2_acl_entry) + 4; 50aa98d7cfSKaiGai Kohei } 51aa98d7cfSKaiGai Kohei } 52aa98d7cfSKaiGai Kohei 53dea80134SKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) 54aa98d7cfSKaiGai Kohei { 55dea80134SKaiGai Kohei void *end = value + size; 56dea80134SKaiGai Kohei struct jffs2_acl_header *header = value; 57dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 58aa98d7cfSKaiGai Kohei struct posix_acl *acl; 59aa98d7cfSKaiGai Kohei uint32_t ver; 60aa98d7cfSKaiGai Kohei int i, count; 61aa98d7cfSKaiGai Kohei 62aa98d7cfSKaiGai Kohei if (!value) 63aa98d7cfSKaiGai Kohei return NULL; 64de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 65aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 66dea80134SKaiGai Kohei ver = je32_to_cpu(header->a_version); 67aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 68aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 69aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 70aa98d7cfSKaiGai Kohei } 71aa98d7cfSKaiGai Kohei 72dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_header); 73aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 74aa98d7cfSKaiGai Kohei if (count < 0) 75aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 76aa98d7cfSKaiGai Kohei if (count == 0) 77aa98d7cfSKaiGai Kohei return NULL; 78aa98d7cfSKaiGai Kohei 79aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 80aa98d7cfSKaiGai Kohei if (!acl) 81aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 82aa98d7cfSKaiGai Kohei 83aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 84dea80134SKaiGai Kohei entry = value; 85dea80134SKaiGai Kohei if (value + sizeof(struct jffs2_acl_entry_short) > end) 86aa98d7cfSKaiGai Kohei goto fail; 87aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 88aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 89aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 90aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 91aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 92aa98d7cfSKaiGai Kohei case ACL_MASK: 93aa98d7cfSKaiGai Kohei case ACL_OTHER: 94dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry_short); 95aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = ACL_UNDEFINED_ID; 96aa98d7cfSKaiGai Kohei break; 97aa98d7cfSKaiGai Kohei 98aa98d7cfSKaiGai Kohei case ACL_USER: 99aa98d7cfSKaiGai Kohei case ACL_GROUP: 100dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry); 101dea80134SKaiGai Kohei if (value > end) 102aa98d7cfSKaiGai Kohei goto fail; 103aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); 104aa98d7cfSKaiGai Kohei break; 105aa98d7cfSKaiGai Kohei 106aa98d7cfSKaiGai Kohei default: 107aa98d7cfSKaiGai Kohei goto fail; 108aa98d7cfSKaiGai Kohei } 109aa98d7cfSKaiGai Kohei } 110aa98d7cfSKaiGai Kohei if (value != end) 111aa98d7cfSKaiGai Kohei goto fail; 112aa98d7cfSKaiGai Kohei return acl; 113aa98d7cfSKaiGai Kohei fail: 114aa98d7cfSKaiGai Kohei posix_acl_release(acl); 115aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 116aa98d7cfSKaiGai Kohei } 117aa98d7cfSKaiGai Kohei 118aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 119aa98d7cfSKaiGai Kohei { 120dea80134SKaiGai Kohei struct jffs2_acl_header *header; 121dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 122dea80134SKaiGai Kohei void *e; 123aa98d7cfSKaiGai Kohei size_t i; 124aa98d7cfSKaiGai Kohei 125aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 126dea80134SKaiGai Kohei header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); 127dea80134SKaiGai Kohei if (!header) 128aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 129dea80134SKaiGai Kohei header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 130dea80134SKaiGai Kohei e = header + 1; 131aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 132dea80134SKaiGai Kohei entry = e; 133aa98d7cfSKaiGai Kohei entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); 134aa98d7cfSKaiGai Kohei entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); 135aa98d7cfSKaiGai Kohei switch(acl->a_entries[i].e_tag) { 136aa98d7cfSKaiGai Kohei case ACL_USER: 137aa98d7cfSKaiGai Kohei case ACL_GROUP: 138aa98d7cfSKaiGai Kohei entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); 139de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 140aa98d7cfSKaiGai Kohei break; 141aa98d7cfSKaiGai Kohei 142aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 143aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 144aa98d7cfSKaiGai Kohei case ACL_MASK: 145aa98d7cfSKaiGai Kohei case ACL_OTHER: 146de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 147aa98d7cfSKaiGai Kohei break; 148aa98d7cfSKaiGai Kohei 149aa98d7cfSKaiGai Kohei default: 150aa98d7cfSKaiGai Kohei goto fail; 151aa98d7cfSKaiGai Kohei } 152aa98d7cfSKaiGai Kohei } 153dea80134SKaiGai Kohei return header; 154aa98d7cfSKaiGai Kohei fail: 155dea80134SKaiGai Kohei kfree(header); 156aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 157aa98d7cfSKaiGai Kohei } 158aa98d7cfSKaiGai Kohei 159aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl) 160aa98d7cfSKaiGai Kohei { 161aa98d7cfSKaiGai Kohei struct posix_acl *acl = JFFS2_ACL_NOT_CACHED; 162aa98d7cfSKaiGai Kohei 163aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 164aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 165aa98d7cfSKaiGai Kohei acl = posix_acl_dup(*i_acl); 166aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 167aa98d7cfSKaiGai Kohei return acl; 168aa98d7cfSKaiGai Kohei } 169aa98d7cfSKaiGai Kohei 170aa98d7cfSKaiGai Kohei static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl) 171aa98d7cfSKaiGai Kohei { 172aa98d7cfSKaiGai Kohei spin_lock(&inode->i_lock); 173aa98d7cfSKaiGai Kohei if (*i_acl != JFFS2_ACL_NOT_CACHED) 174aa98d7cfSKaiGai Kohei posix_acl_release(*i_acl); 175aa98d7cfSKaiGai Kohei *i_acl = posix_acl_dup(acl); 176aa98d7cfSKaiGai Kohei spin_unlock(&inode->i_lock); 177aa98d7cfSKaiGai Kohei } 178aa98d7cfSKaiGai Kohei 179aa98d7cfSKaiGai Kohei static struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 180aa98d7cfSKaiGai Kohei { 181aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 182aa98d7cfSKaiGai Kohei struct posix_acl *acl; 183aa98d7cfSKaiGai Kohei char *value = NULL; 184aa98d7cfSKaiGai Kohei int rc, xprefix; 185aa98d7cfSKaiGai Kohei 186aa98d7cfSKaiGai Kohei switch (type) { 187aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 188aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_access); 189aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 190aa98d7cfSKaiGai Kohei return acl; 191aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 192aa98d7cfSKaiGai Kohei break; 193aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 194aa98d7cfSKaiGai Kohei acl = jffs2_iget_acl(inode, &f->i_acl_default); 195aa98d7cfSKaiGai Kohei if (acl != JFFS2_ACL_NOT_CACHED) 196aa98d7cfSKaiGai Kohei return acl; 197aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 198aa98d7cfSKaiGai Kohei break; 199aa98d7cfSKaiGai Kohei default: 200aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 201aa98d7cfSKaiGai Kohei } 202aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 203aa98d7cfSKaiGai Kohei if (rc > 0) { 204aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 205aa98d7cfSKaiGai Kohei if (!value) 206aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 207aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 208aa98d7cfSKaiGai Kohei } 209aa98d7cfSKaiGai Kohei if (rc > 0) { 210aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 211aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 212aa98d7cfSKaiGai Kohei acl = NULL; 213aa98d7cfSKaiGai Kohei } else { 214aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 215aa98d7cfSKaiGai Kohei } 216aa98d7cfSKaiGai Kohei if (value) 217aa98d7cfSKaiGai Kohei kfree(value); 218aa98d7cfSKaiGai Kohei if (!IS_ERR(acl)) { 219aa98d7cfSKaiGai Kohei switch (type) { 220aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 221aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 222aa98d7cfSKaiGai Kohei break; 223aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 224aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 225aa98d7cfSKaiGai Kohei break; 226aa98d7cfSKaiGai Kohei } 227aa98d7cfSKaiGai Kohei } 228aa98d7cfSKaiGai Kohei return acl; 229aa98d7cfSKaiGai Kohei } 230aa98d7cfSKaiGai Kohei 231aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 232aa98d7cfSKaiGai Kohei { 233aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 234aa98d7cfSKaiGai Kohei size_t size = 0; 235aa98d7cfSKaiGai Kohei char *value = NULL; 236aa98d7cfSKaiGai Kohei int rc, xprefix; 237aa98d7cfSKaiGai Kohei 238aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 239aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 240aa98d7cfSKaiGai Kohei 241aa98d7cfSKaiGai Kohei switch (type) { 242aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 243aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 244aa98d7cfSKaiGai Kohei if (acl) { 245aa98d7cfSKaiGai Kohei mode_t mode = inode->i_mode; 246aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 247aa98d7cfSKaiGai Kohei if (rc < 0) 248aa98d7cfSKaiGai Kohei return rc; 249aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 250aa98d7cfSKaiGai Kohei inode->i_mode = mode; 251aa98d7cfSKaiGai Kohei jffs2_dirty_inode(inode); 252aa98d7cfSKaiGai Kohei } 253aa98d7cfSKaiGai Kohei if (rc == 0) 254aa98d7cfSKaiGai Kohei acl = NULL; 255aa98d7cfSKaiGai Kohei } 256aa98d7cfSKaiGai Kohei break; 257aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 258aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 259aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 260aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 261aa98d7cfSKaiGai Kohei break; 262aa98d7cfSKaiGai Kohei default: 263aa98d7cfSKaiGai Kohei return -EINVAL; 264aa98d7cfSKaiGai Kohei } 265aa98d7cfSKaiGai Kohei if (acl) { 266aa98d7cfSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 267aa98d7cfSKaiGai Kohei if (IS_ERR(value)) 268aa98d7cfSKaiGai Kohei return PTR_ERR(value); 269aa98d7cfSKaiGai Kohei } 270aa98d7cfSKaiGai Kohei 271aa98d7cfSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 272a1ae76e9SKaiGai Kohei if (!value && rc == -ENODATA) 273a1ae76e9SKaiGai Kohei rc = 0; 274aa98d7cfSKaiGai Kohei if (value) 275aa98d7cfSKaiGai Kohei kfree(value); 276aa98d7cfSKaiGai Kohei if (!rc) { 277aa98d7cfSKaiGai Kohei switch(type) { 278aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 279aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 280aa98d7cfSKaiGai Kohei break; 281aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 282aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 283aa98d7cfSKaiGai Kohei break; 284aa98d7cfSKaiGai Kohei } 285aa98d7cfSKaiGai Kohei } 286aa98d7cfSKaiGai Kohei return rc; 287aa98d7cfSKaiGai Kohei } 288aa98d7cfSKaiGai Kohei 289aa98d7cfSKaiGai Kohei static int jffs2_check_acl(struct inode *inode, int mask) 290aa98d7cfSKaiGai Kohei { 291aa98d7cfSKaiGai Kohei struct posix_acl *acl; 292aa98d7cfSKaiGai Kohei int rc; 293aa98d7cfSKaiGai Kohei 294aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 295aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 296aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 297aa98d7cfSKaiGai Kohei if (acl) { 298aa98d7cfSKaiGai Kohei rc = posix_acl_permission(inode, acl, mask); 299aa98d7cfSKaiGai Kohei posix_acl_release(acl); 300aa98d7cfSKaiGai Kohei return rc; 301aa98d7cfSKaiGai Kohei } 302aa98d7cfSKaiGai Kohei return -EAGAIN; 303aa98d7cfSKaiGai Kohei } 304aa98d7cfSKaiGai Kohei 305aa98d7cfSKaiGai Kohei int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd) 306aa98d7cfSKaiGai Kohei { 307aa98d7cfSKaiGai Kohei return generic_permission(inode, mask, jffs2_check_acl); 308aa98d7cfSKaiGai Kohei } 309aa98d7cfSKaiGai Kohei 310aa98d7cfSKaiGai Kohei int jffs2_init_acl(struct inode *inode, struct inode *dir) 311aa98d7cfSKaiGai Kohei { 312aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 313aa98d7cfSKaiGai Kohei struct posix_acl *acl = NULL, *clone; 314aa98d7cfSKaiGai Kohei mode_t mode; 315aa98d7cfSKaiGai Kohei int rc = 0; 316aa98d7cfSKaiGai Kohei 317aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 318aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 319aa98d7cfSKaiGai Kohei if (!S_ISLNK(inode->i_mode)) { 320aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(dir, ACL_TYPE_DEFAULT); 321aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 322aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 323aa98d7cfSKaiGai Kohei if (!acl) 324aa98d7cfSKaiGai Kohei inode->i_mode &= ~current->fs->umask; 325aa98d7cfSKaiGai Kohei } 326aa98d7cfSKaiGai Kohei if (acl) { 327aa98d7cfSKaiGai Kohei if (S_ISDIR(inode->i_mode)) { 328aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl); 329aa98d7cfSKaiGai Kohei if (rc) 330aa98d7cfSKaiGai Kohei goto cleanup; 331aa98d7cfSKaiGai Kohei } 332aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 333aa98d7cfSKaiGai Kohei rc = -ENOMEM; 334aa98d7cfSKaiGai Kohei if (!clone) 335aa98d7cfSKaiGai Kohei goto cleanup; 336aa98d7cfSKaiGai Kohei mode = inode->i_mode; 337aa98d7cfSKaiGai Kohei rc = posix_acl_create_masq(clone, &mode); 338aa98d7cfSKaiGai Kohei if (rc >= 0) { 339aa98d7cfSKaiGai Kohei inode->i_mode = mode; 340aa98d7cfSKaiGai Kohei if (rc > 0) 341aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 342aa98d7cfSKaiGai Kohei } 343aa98d7cfSKaiGai Kohei posix_acl_release(clone); 344aa98d7cfSKaiGai Kohei } 345aa98d7cfSKaiGai Kohei cleanup: 346aa98d7cfSKaiGai Kohei posix_acl_release(acl); 347aa98d7cfSKaiGai Kohei return rc; 348aa98d7cfSKaiGai Kohei } 349aa98d7cfSKaiGai Kohei 350c7afb0f9SKaiGai Kohei void jffs2_clear_acl(struct jffs2_inode_info *f) 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