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); 41fc371a25SRoel Kluin if (size < 4 * sizeof(struct jffs2_acl_entry_short)) { 42de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 43aa98d7cfSKaiGai Kohei return -1; 44de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 45aa98d7cfSKaiGai Kohei } else { 46fc371a25SRoel Kluin s = size - 4 * sizeof(struct jffs2_acl_entry_short); 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 179050416e9SAdrian Bunk 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 231cfc8dc6fSKaiGai Kohei static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl) 232cfc8dc6fSKaiGai Kohei { 233cfc8dc6fSKaiGai Kohei char *value = NULL; 234cfc8dc6fSKaiGai Kohei size_t size = 0; 235cfc8dc6fSKaiGai Kohei int rc; 236cfc8dc6fSKaiGai Kohei 237cfc8dc6fSKaiGai Kohei if (acl) { 238cfc8dc6fSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 239cfc8dc6fSKaiGai Kohei if (IS_ERR(value)) 240cfc8dc6fSKaiGai Kohei return PTR_ERR(value); 241cfc8dc6fSKaiGai Kohei } 242cfc8dc6fSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 243cfc8dc6fSKaiGai Kohei if (!value && rc == -ENODATA) 244cfc8dc6fSKaiGai Kohei rc = 0; 245cfc8dc6fSKaiGai Kohei kfree(value); 246cfc8dc6fSKaiGai Kohei 247cfc8dc6fSKaiGai Kohei return rc; 248cfc8dc6fSKaiGai Kohei } 249cfc8dc6fSKaiGai Kohei 250aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 251aa98d7cfSKaiGai Kohei { 252aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 253aa98d7cfSKaiGai Kohei int rc, xprefix; 254aa98d7cfSKaiGai Kohei 255aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 256aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 257aa98d7cfSKaiGai Kohei 258aa98d7cfSKaiGai Kohei switch (type) { 259aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 260aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 261aa98d7cfSKaiGai Kohei if (acl) { 262aa98d7cfSKaiGai Kohei mode_t mode = inode->i_mode; 263aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 264aa98d7cfSKaiGai Kohei if (rc < 0) 265aa98d7cfSKaiGai Kohei return rc; 266aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 2679ed437c5SDavid Woodhouse struct iattr attr; 2689ed437c5SDavid Woodhouse 2699ed437c5SDavid Woodhouse attr.ia_valid = ATTR_MODE; 2709ed437c5SDavid Woodhouse attr.ia_mode = mode; 2719ed437c5SDavid Woodhouse rc = jffs2_do_setattr(inode, &attr); 2729ed437c5SDavid Woodhouse if (rc < 0) 2739ed437c5SDavid Woodhouse return rc; 274aa98d7cfSKaiGai Kohei } 275aa98d7cfSKaiGai Kohei if (rc == 0) 276aa98d7cfSKaiGai Kohei acl = NULL; 277aa98d7cfSKaiGai Kohei } 278aa98d7cfSKaiGai Kohei break; 279aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 280aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 281aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 282aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 283aa98d7cfSKaiGai Kohei break; 284aa98d7cfSKaiGai Kohei default: 285aa98d7cfSKaiGai Kohei return -EINVAL; 286aa98d7cfSKaiGai Kohei } 287cfc8dc6fSKaiGai Kohei rc = __jffs2_set_acl(inode, xprefix, acl); 288aa98d7cfSKaiGai Kohei if (!rc) { 289aa98d7cfSKaiGai Kohei switch(type) { 290aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 291aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, acl); 292aa98d7cfSKaiGai Kohei break; 293aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 294aa98d7cfSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 295aa98d7cfSKaiGai Kohei break; 296aa98d7cfSKaiGai Kohei } 297aa98d7cfSKaiGai Kohei } 298aa98d7cfSKaiGai Kohei return rc; 299aa98d7cfSKaiGai Kohei } 300aa98d7cfSKaiGai Kohei 301aa98d7cfSKaiGai Kohei static int jffs2_check_acl(struct inode *inode, int mask) 302aa98d7cfSKaiGai Kohei { 303aa98d7cfSKaiGai Kohei struct posix_acl *acl; 304aa98d7cfSKaiGai Kohei int rc; 305aa98d7cfSKaiGai Kohei 306aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 307aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 308aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 309aa98d7cfSKaiGai Kohei if (acl) { 310aa98d7cfSKaiGai Kohei rc = posix_acl_permission(inode, acl, mask); 311aa98d7cfSKaiGai Kohei posix_acl_release(acl); 312aa98d7cfSKaiGai Kohei return rc; 313aa98d7cfSKaiGai Kohei } 314aa98d7cfSKaiGai Kohei return -EAGAIN; 315aa98d7cfSKaiGai Kohei } 316aa98d7cfSKaiGai Kohei 317e6305c43SAl Viro int jffs2_permission(struct inode *inode, int mask) 318aa98d7cfSKaiGai Kohei { 319aa98d7cfSKaiGai Kohei return generic_permission(inode, mask, jffs2_check_acl); 320aa98d7cfSKaiGai Kohei } 321aa98d7cfSKaiGai Kohei 322cfc8dc6fSKaiGai Kohei int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode) 323aa98d7cfSKaiGai Kohei { 324aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 325cfc8dc6fSKaiGai Kohei struct posix_acl *acl, *clone; 326cfc8dc6fSKaiGai Kohei int rc; 327aa98d7cfSKaiGai Kohei 328cfc8dc6fSKaiGai Kohei f->i_acl_default = NULL; 329cfc8dc6fSKaiGai Kohei f->i_acl_access = NULL; 3309ed437c5SDavid Woodhouse 331cfc8dc6fSKaiGai Kohei if (S_ISLNK(*i_mode)) 332cfc8dc6fSKaiGai Kohei return 0; /* Symlink always has no-ACL */ 333cfc8dc6fSKaiGai Kohei 334cfc8dc6fSKaiGai Kohei acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT); 335cfc8dc6fSKaiGai Kohei if (IS_ERR(acl)) 336cfc8dc6fSKaiGai Kohei return PTR_ERR(acl); 337cfc8dc6fSKaiGai Kohei 338cfc8dc6fSKaiGai Kohei if (!acl) { 339cfc8dc6fSKaiGai Kohei *i_mode &= ~current->fs->umask; 340cfc8dc6fSKaiGai Kohei } else { 341cfc8dc6fSKaiGai Kohei if (S_ISDIR(*i_mode)) 342cfc8dc6fSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_default, acl); 343cfc8dc6fSKaiGai Kohei 344aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 345aa98d7cfSKaiGai Kohei if (!clone) 346cfc8dc6fSKaiGai Kohei return -ENOMEM; 347cfc8dc6fSKaiGai Kohei rc = posix_acl_create_masq(clone, (mode_t *)i_mode); 34836f97bc6SJulia Lawall if (rc < 0) { 34936f97bc6SJulia Lawall posix_acl_release(clone); 350cfc8dc6fSKaiGai Kohei return rc; 35136f97bc6SJulia Lawall } 352aa98d7cfSKaiGai Kohei if (rc > 0) 353cfc8dc6fSKaiGai Kohei jffs2_iset_acl(inode, &f->i_acl_access, clone); 354cfc8dc6fSKaiGai Kohei 355aa98d7cfSKaiGai Kohei posix_acl_release(clone); 356aa98d7cfSKaiGai Kohei } 357cfc8dc6fSKaiGai Kohei return 0; 358cfc8dc6fSKaiGai Kohei } 359cfc8dc6fSKaiGai Kohei 360cfc8dc6fSKaiGai Kohei int jffs2_init_acl_post(struct inode *inode) 361cfc8dc6fSKaiGai Kohei { 362cfc8dc6fSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 363cfc8dc6fSKaiGai Kohei int rc; 364cfc8dc6fSKaiGai Kohei 365cfc8dc6fSKaiGai Kohei if (f->i_acl_default) { 366cfc8dc6fSKaiGai Kohei rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, f->i_acl_default); 367cfc8dc6fSKaiGai Kohei if (rc) 368cfc8dc6fSKaiGai Kohei return rc; 369cfc8dc6fSKaiGai Kohei } 370cfc8dc6fSKaiGai Kohei 371cfc8dc6fSKaiGai Kohei if (f->i_acl_access) { 372cfc8dc6fSKaiGai Kohei rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, f->i_acl_access); 373cfc8dc6fSKaiGai Kohei if (rc) 374cfc8dc6fSKaiGai Kohei return rc; 375cfc8dc6fSKaiGai Kohei } 376cfc8dc6fSKaiGai Kohei 3778d6ea587SDavid Woodhouse return 0; 378aa98d7cfSKaiGai Kohei } 379aa98d7cfSKaiGai Kohei 380c7afb0f9SKaiGai Kohei void jffs2_clear_acl(struct jffs2_inode_info *f) 381aa98d7cfSKaiGai Kohei { 382aa98d7cfSKaiGai Kohei if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) { 383aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_access); 384aa98d7cfSKaiGai Kohei f->i_acl_access = JFFS2_ACL_NOT_CACHED; 385aa98d7cfSKaiGai Kohei } 386aa98d7cfSKaiGai Kohei if (f->i_acl_default && f->i_acl_default != JFFS2_ACL_NOT_CACHED) { 387aa98d7cfSKaiGai Kohei posix_acl_release(f->i_acl_default); 388aa98d7cfSKaiGai Kohei f->i_acl_default = JFFS2_ACL_NOT_CACHED; 389aa98d7cfSKaiGai Kohei } 390aa98d7cfSKaiGai Kohei } 391aa98d7cfSKaiGai Kohei 392aa98d7cfSKaiGai Kohei int jffs2_acl_chmod(struct inode *inode) 393aa98d7cfSKaiGai Kohei { 394aa98d7cfSKaiGai Kohei struct posix_acl *acl, *clone; 395aa98d7cfSKaiGai Kohei int rc; 396aa98d7cfSKaiGai Kohei 397aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 398aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 399aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 400aa98d7cfSKaiGai Kohei if (IS_ERR(acl) || !acl) 401aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 402aa98d7cfSKaiGai Kohei clone = posix_acl_clone(acl, GFP_KERNEL); 403aa98d7cfSKaiGai Kohei posix_acl_release(acl); 404aa98d7cfSKaiGai Kohei if (!clone) 405aa98d7cfSKaiGai Kohei return -ENOMEM; 406aa98d7cfSKaiGai Kohei rc = posix_acl_chmod_masq(clone, inode->i_mode); 407aa98d7cfSKaiGai Kohei if (!rc) 408aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone); 409aa98d7cfSKaiGai Kohei posix_acl_release(clone); 410aa98d7cfSKaiGai Kohei return rc; 411aa98d7cfSKaiGai Kohei } 412aa98d7cfSKaiGai Kohei 413aa98d7cfSKaiGai Kohei static size_t jffs2_acl_access_listxattr(struct inode *inode, char *list, size_t list_size, 414aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 415aa98d7cfSKaiGai Kohei { 416aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); 417aa98d7cfSKaiGai Kohei 418aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 419aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_ACCESS); 420aa98d7cfSKaiGai Kohei return retlen; 421aa98d7cfSKaiGai Kohei } 422aa98d7cfSKaiGai Kohei 423aa98d7cfSKaiGai Kohei static size_t jffs2_acl_default_listxattr(struct inode *inode, char *list, size_t list_size, 424aa98d7cfSKaiGai Kohei const char *name, size_t name_len) 425aa98d7cfSKaiGai Kohei { 426aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); 427aa98d7cfSKaiGai Kohei 428aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 429aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_DEFAULT); 430aa98d7cfSKaiGai Kohei return retlen; 431aa98d7cfSKaiGai Kohei } 432aa98d7cfSKaiGai Kohei 433aa98d7cfSKaiGai Kohei static int jffs2_acl_getxattr(struct inode *inode, int type, void *buffer, size_t size) 434aa98d7cfSKaiGai Kohei { 435aa98d7cfSKaiGai Kohei struct posix_acl *acl; 436aa98d7cfSKaiGai Kohei int rc; 437aa98d7cfSKaiGai Kohei 438aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, type); 439aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 440aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 441aa98d7cfSKaiGai Kohei if (!acl) 442aa98d7cfSKaiGai Kohei return -ENODATA; 443aa98d7cfSKaiGai Kohei rc = posix_acl_to_xattr(acl, buffer, size); 444aa98d7cfSKaiGai Kohei posix_acl_release(acl); 445aa98d7cfSKaiGai Kohei 446aa98d7cfSKaiGai Kohei return rc; 447aa98d7cfSKaiGai Kohei } 448aa98d7cfSKaiGai Kohei 449aa98d7cfSKaiGai Kohei static int jffs2_acl_access_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 450aa98d7cfSKaiGai Kohei { 451aa98d7cfSKaiGai Kohei if (name[0] != '\0') 452aa98d7cfSKaiGai Kohei return -EINVAL; 453aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_ACCESS, buffer, size); 454aa98d7cfSKaiGai Kohei } 455aa98d7cfSKaiGai Kohei 456aa98d7cfSKaiGai Kohei static int jffs2_acl_default_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) 457aa98d7cfSKaiGai Kohei { 458aa98d7cfSKaiGai Kohei if (name[0] != '\0') 459aa98d7cfSKaiGai Kohei return -EINVAL; 460aa98d7cfSKaiGai Kohei return jffs2_acl_getxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 461aa98d7cfSKaiGai Kohei } 462aa98d7cfSKaiGai Kohei 463aa98d7cfSKaiGai Kohei static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value, size_t size) 464aa98d7cfSKaiGai Kohei { 465aa98d7cfSKaiGai Kohei struct posix_acl *acl; 466aa98d7cfSKaiGai Kohei int rc; 467aa98d7cfSKaiGai Kohei 4683bd858abSSatyam Sharma if (!is_owner_or_cap(inode)) 469aa98d7cfSKaiGai Kohei return -EPERM; 470aa98d7cfSKaiGai Kohei 471aa98d7cfSKaiGai Kohei if (value) { 472aa98d7cfSKaiGai Kohei acl = posix_acl_from_xattr(value, size); 473aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 474aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 475aa98d7cfSKaiGai Kohei if (acl) { 476aa98d7cfSKaiGai Kohei rc = posix_acl_valid(acl); 477aa98d7cfSKaiGai Kohei if (rc) 478aa98d7cfSKaiGai Kohei goto out; 479aa98d7cfSKaiGai Kohei } 480aa98d7cfSKaiGai Kohei } else { 481aa98d7cfSKaiGai Kohei acl = NULL; 482aa98d7cfSKaiGai Kohei } 483aa98d7cfSKaiGai Kohei rc = jffs2_set_acl(inode, type, acl); 484aa98d7cfSKaiGai Kohei out: 485aa98d7cfSKaiGai Kohei posix_acl_release(acl); 486aa98d7cfSKaiGai Kohei return rc; 487aa98d7cfSKaiGai Kohei } 488aa98d7cfSKaiGai Kohei 489aa98d7cfSKaiGai Kohei static int jffs2_acl_access_setxattr(struct inode *inode, const char *name, 490aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 491aa98d7cfSKaiGai Kohei { 492aa98d7cfSKaiGai Kohei if (name[0] != '\0') 493aa98d7cfSKaiGai Kohei return -EINVAL; 494aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_ACCESS, buffer, size); 495aa98d7cfSKaiGai Kohei } 496aa98d7cfSKaiGai Kohei 497aa98d7cfSKaiGai Kohei static int jffs2_acl_default_setxattr(struct inode *inode, const char *name, 498aa98d7cfSKaiGai Kohei const void *buffer, size_t size, int flags) 499aa98d7cfSKaiGai Kohei { 500aa98d7cfSKaiGai Kohei if (name[0] != '\0') 501aa98d7cfSKaiGai Kohei return -EINVAL; 502aa98d7cfSKaiGai Kohei return jffs2_acl_setxattr(inode, ACL_TYPE_DEFAULT, buffer, size); 503aa98d7cfSKaiGai Kohei } 504aa98d7cfSKaiGai Kohei 505aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_access_xattr_handler = { 506aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_ACCESS, 507aa98d7cfSKaiGai Kohei .list = jffs2_acl_access_listxattr, 508aa98d7cfSKaiGai Kohei .get = jffs2_acl_access_getxattr, 509aa98d7cfSKaiGai Kohei .set = jffs2_acl_access_setxattr, 510aa98d7cfSKaiGai Kohei }; 511aa98d7cfSKaiGai Kohei 512aa98d7cfSKaiGai Kohei struct xattr_handler jffs2_acl_default_xattr_handler = { 513aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_DEFAULT, 514aa98d7cfSKaiGai Kohei .list = jffs2_acl_default_listxattr, 515aa98d7cfSKaiGai Kohei .get = jffs2_acl_default_getxattr, 516aa98d7cfSKaiGai Kohei .set = jffs2_acl_default_setxattr, 517aa98d7cfSKaiGai Kohei }; 518