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 125a528957SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 135a528957SJoe Perches 14aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 15aa98d7cfSKaiGai Kohei #include <linux/slab.h> 16aa98d7cfSKaiGai Kohei #include <linux/fs.h> 17914e2637SAl Viro #include <linux/sched.h> 18aa98d7cfSKaiGai Kohei #include <linux/time.h> 19aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 20aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 21aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 22aa98d7cfSKaiGai Kohei #include <linux/posix_acl_xattr.h> 23aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 24aa98d7cfSKaiGai Kohei #include "nodelist.h" 25aa98d7cfSKaiGai Kohei 26aa98d7cfSKaiGai Kohei static size_t jffs2_acl_size(int count) 27aa98d7cfSKaiGai Kohei { 28aa98d7cfSKaiGai Kohei if (count <= 4) { 29de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 30de1f72faSKaiGai Kohei + count * sizeof(struct jffs2_acl_entry_short); 31aa98d7cfSKaiGai Kohei } else { 32de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 33de1f72faSKaiGai Kohei + 4 * sizeof(struct jffs2_acl_entry_short) 34de1f72faSKaiGai Kohei + (count - 4) * sizeof(struct jffs2_acl_entry); 35aa98d7cfSKaiGai Kohei } 36aa98d7cfSKaiGai Kohei } 37aa98d7cfSKaiGai Kohei 38aa98d7cfSKaiGai Kohei static int jffs2_acl_count(size_t size) 39aa98d7cfSKaiGai Kohei { 40aa98d7cfSKaiGai Kohei size_t s; 41aa98d7cfSKaiGai Kohei 42de1f72faSKaiGai Kohei size -= sizeof(struct jffs2_acl_header); 43fc371a25SRoel Kluin if (size < 4 * sizeof(struct jffs2_acl_entry_short)) { 44de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 45aa98d7cfSKaiGai Kohei return -1; 46de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 47aa98d7cfSKaiGai Kohei } else { 48fc371a25SRoel Kluin s = size - 4 * sizeof(struct jffs2_acl_entry_short); 49de1f72faSKaiGai Kohei if (s % sizeof(struct jffs2_acl_entry)) 50aa98d7cfSKaiGai Kohei return -1; 51de1f72faSKaiGai Kohei return s / sizeof(struct jffs2_acl_entry) + 4; 52aa98d7cfSKaiGai Kohei } 53aa98d7cfSKaiGai Kohei } 54aa98d7cfSKaiGai Kohei 55dea80134SKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) 56aa98d7cfSKaiGai Kohei { 57dea80134SKaiGai Kohei void *end = value + size; 58dea80134SKaiGai Kohei struct jffs2_acl_header *header = value; 59dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 60aa98d7cfSKaiGai Kohei struct posix_acl *acl; 61aa98d7cfSKaiGai Kohei uint32_t ver; 62aa98d7cfSKaiGai Kohei int i, count; 63aa98d7cfSKaiGai Kohei 64aa98d7cfSKaiGai Kohei if (!value) 65aa98d7cfSKaiGai Kohei return NULL; 66de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 67aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 68dea80134SKaiGai Kohei ver = je32_to_cpu(header->a_version); 69aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 70aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 71aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 72aa98d7cfSKaiGai Kohei } 73aa98d7cfSKaiGai Kohei 74dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_header); 75aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 76aa98d7cfSKaiGai Kohei if (count < 0) 77aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 78aa98d7cfSKaiGai Kohei if (count == 0) 79aa98d7cfSKaiGai Kohei return NULL; 80aa98d7cfSKaiGai Kohei 81aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 82aa98d7cfSKaiGai Kohei if (!acl) 83aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 84aa98d7cfSKaiGai Kohei 85aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 86dea80134SKaiGai Kohei entry = value; 87dea80134SKaiGai Kohei if (value + sizeof(struct jffs2_acl_entry_short) > end) 88aa98d7cfSKaiGai Kohei goto fail; 89aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 90aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 91aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 92aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 93aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 94aa98d7cfSKaiGai Kohei case ACL_MASK: 95aa98d7cfSKaiGai Kohei case ACL_OTHER: 96dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry_short); 97aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = ACL_UNDEFINED_ID; 98aa98d7cfSKaiGai Kohei break; 99aa98d7cfSKaiGai Kohei 100aa98d7cfSKaiGai Kohei case ACL_USER: 101aa98d7cfSKaiGai Kohei case ACL_GROUP: 102dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry); 103dea80134SKaiGai Kohei if (value > end) 104aa98d7cfSKaiGai Kohei goto fail; 105aa98d7cfSKaiGai Kohei acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); 106aa98d7cfSKaiGai Kohei break; 107aa98d7cfSKaiGai Kohei 108aa98d7cfSKaiGai Kohei default: 109aa98d7cfSKaiGai Kohei goto fail; 110aa98d7cfSKaiGai Kohei } 111aa98d7cfSKaiGai Kohei } 112aa98d7cfSKaiGai Kohei if (value != end) 113aa98d7cfSKaiGai Kohei goto fail; 114aa98d7cfSKaiGai Kohei return acl; 115aa98d7cfSKaiGai Kohei fail: 116aa98d7cfSKaiGai Kohei posix_acl_release(acl); 117aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 118aa98d7cfSKaiGai Kohei } 119aa98d7cfSKaiGai Kohei 120aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 121aa98d7cfSKaiGai Kohei { 122dea80134SKaiGai Kohei struct jffs2_acl_header *header; 123dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 124dea80134SKaiGai Kohei void *e; 125aa98d7cfSKaiGai Kohei size_t i; 126aa98d7cfSKaiGai Kohei 127aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 128dea80134SKaiGai Kohei header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); 129dea80134SKaiGai Kohei if (!header) 130aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 131dea80134SKaiGai Kohei header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 132dea80134SKaiGai Kohei e = header + 1; 133aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 134dea80134SKaiGai Kohei entry = e; 135aa98d7cfSKaiGai Kohei entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); 136aa98d7cfSKaiGai Kohei entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); 137aa98d7cfSKaiGai Kohei switch(acl->a_entries[i].e_tag) { 138aa98d7cfSKaiGai Kohei case ACL_USER: 139aa98d7cfSKaiGai Kohei case ACL_GROUP: 140aa98d7cfSKaiGai Kohei entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); 141de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 142aa98d7cfSKaiGai Kohei break; 143aa98d7cfSKaiGai Kohei 144aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 145aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 146aa98d7cfSKaiGai Kohei case ACL_MASK: 147aa98d7cfSKaiGai Kohei case ACL_OTHER: 148de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 149aa98d7cfSKaiGai Kohei break; 150aa98d7cfSKaiGai Kohei 151aa98d7cfSKaiGai Kohei default: 152aa98d7cfSKaiGai Kohei goto fail; 153aa98d7cfSKaiGai Kohei } 154aa98d7cfSKaiGai Kohei } 155dea80134SKaiGai Kohei return header; 156aa98d7cfSKaiGai Kohei fail: 157dea80134SKaiGai Kohei kfree(header); 158aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 159aa98d7cfSKaiGai Kohei } 160aa98d7cfSKaiGai Kohei 1614e34e719SChristoph Hellwig struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 162aa98d7cfSKaiGai Kohei { 163aa98d7cfSKaiGai Kohei struct posix_acl *acl; 164aa98d7cfSKaiGai Kohei char *value = NULL; 165aa98d7cfSKaiGai Kohei int rc, xprefix; 166aa98d7cfSKaiGai Kohei 167073aaa1bSAl Viro acl = get_cached_acl(inode, type); 168290c263bSAl Viro if (acl != ACL_NOT_CACHED) 169aa98d7cfSKaiGai Kohei return acl; 170073aaa1bSAl Viro 171073aaa1bSAl Viro switch (type) { 172073aaa1bSAl Viro case ACL_TYPE_ACCESS: 173aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 174aa98d7cfSKaiGai Kohei break; 175aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 176aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 177aa98d7cfSKaiGai Kohei break; 178aa98d7cfSKaiGai Kohei default: 179073aaa1bSAl Viro BUG(); 180aa98d7cfSKaiGai Kohei } 181aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 182aa98d7cfSKaiGai Kohei if (rc > 0) { 183aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 184aa98d7cfSKaiGai Kohei if (!value) 185aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 186aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 187aa98d7cfSKaiGai Kohei } 188aa98d7cfSKaiGai Kohei if (rc > 0) { 189aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 190aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 191aa98d7cfSKaiGai Kohei acl = NULL; 192aa98d7cfSKaiGai Kohei } else { 193aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 194aa98d7cfSKaiGai Kohei } 195aa98d7cfSKaiGai Kohei if (value) 196aa98d7cfSKaiGai Kohei kfree(value); 197073aaa1bSAl Viro if (!IS_ERR(acl)) 198073aaa1bSAl Viro set_cached_acl(inode, type, acl); 199aa98d7cfSKaiGai Kohei return acl; 200aa98d7cfSKaiGai Kohei } 201aa98d7cfSKaiGai Kohei 202cfc8dc6fSKaiGai Kohei static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl) 203cfc8dc6fSKaiGai Kohei { 204cfc8dc6fSKaiGai Kohei char *value = NULL; 205cfc8dc6fSKaiGai Kohei size_t size = 0; 206cfc8dc6fSKaiGai Kohei int rc; 207cfc8dc6fSKaiGai Kohei 208cfc8dc6fSKaiGai Kohei if (acl) { 209cfc8dc6fSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 210cfc8dc6fSKaiGai Kohei if (IS_ERR(value)) 211cfc8dc6fSKaiGai Kohei return PTR_ERR(value); 212cfc8dc6fSKaiGai Kohei } 213cfc8dc6fSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 214cfc8dc6fSKaiGai Kohei if (!value && rc == -ENODATA) 215cfc8dc6fSKaiGai Kohei rc = 0; 216cfc8dc6fSKaiGai Kohei kfree(value); 217cfc8dc6fSKaiGai Kohei 218cfc8dc6fSKaiGai Kohei return rc; 219cfc8dc6fSKaiGai Kohei } 220cfc8dc6fSKaiGai Kohei 221aa98d7cfSKaiGai Kohei static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) 222aa98d7cfSKaiGai Kohei { 223aa98d7cfSKaiGai Kohei int rc, xprefix; 224aa98d7cfSKaiGai Kohei 225aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 226aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 227aa98d7cfSKaiGai Kohei 228aa98d7cfSKaiGai Kohei switch (type) { 229aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 230aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 231aa98d7cfSKaiGai Kohei if (acl) { 232d6952123SAl Viro umode_t mode = inode->i_mode; 233aa98d7cfSKaiGai Kohei rc = posix_acl_equiv_mode(acl, &mode); 234aa98d7cfSKaiGai Kohei if (rc < 0) 235aa98d7cfSKaiGai Kohei return rc; 236aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 2379ed437c5SDavid Woodhouse struct iattr attr; 2389ed437c5SDavid Woodhouse 2391c24d06fSJan Kara attr.ia_valid = ATTR_MODE | ATTR_CTIME; 2409ed437c5SDavid Woodhouse attr.ia_mode = mode; 2411c24d06fSJan Kara attr.ia_ctime = CURRENT_TIME_SEC; 2429ed437c5SDavid Woodhouse rc = jffs2_do_setattr(inode, &attr); 2439ed437c5SDavid Woodhouse if (rc < 0) 2449ed437c5SDavid Woodhouse return rc; 245aa98d7cfSKaiGai Kohei } 246aa98d7cfSKaiGai Kohei if (rc == 0) 247aa98d7cfSKaiGai Kohei acl = NULL; 248aa98d7cfSKaiGai Kohei } 249aa98d7cfSKaiGai Kohei break; 250aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 251aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 252aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 253aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 254aa98d7cfSKaiGai Kohei break; 255aa98d7cfSKaiGai Kohei default: 256aa98d7cfSKaiGai Kohei return -EINVAL; 257aa98d7cfSKaiGai Kohei } 258cfc8dc6fSKaiGai Kohei rc = __jffs2_set_acl(inode, xprefix, acl); 259073aaa1bSAl Viro if (!rc) 260073aaa1bSAl Viro set_cached_acl(inode, type, acl); 261aa98d7cfSKaiGai Kohei return rc; 262aa98d7cfSKaiGai Kohei } 263aa98d7cfSKaiGai Kohei 264d3fb6120SAl Viro int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode) 265aa98d7cfSKaiGai Kohei { 266826cae2fSAl Viro struct posix_acl *acl; 267cfc8dc6fSKaiGai Kohei int rc; 268aa98d7cfSKaiGai Kohei 26972c04902SAl Viro cache_no_acl(inode); 2709ed437c5SDavid Woodhouse 271cfc8dc6fSKaiGai Kohei if (S_ISLNK(*i_mode)) 272cfc8dc6fSKaiGai Kohei return 0; /* Symlink always has no-ACL */ 273cfc8dc6fSKaiGai Kohei 274cfc8dc6fSKaiGai Kohei acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT); 275cfc8dc6fSKaiGai Kohei if (IS_ERR(acl)) 276cfc8dc6fSKaiGai Kohei return PTR_ERR(acl); 277cfc8dc6fSKaiGai Kohei 278cfc8dc6fSKaiGai Kohei if (!acl) { 279ce3b0f8dSAl Viro *i_mode &= ~current_umask(); 280cfc8dc6fSKaiGai Kohei } else { 281cfc8dc6fSKaiGai Kohei if (S_ISDIR(*i_mode)) 282073aaa1bSAl Viro set_cached_acl(inode, ACL_TYPE_DEFAULT, acl); 283cfc8dc6fSKaiGai Kohei 284826cae2fSAl Viro rc = posix_acl_create(&acl, GFP_KERNEL, i_mode); 285826cae2fSAl Viro if (rc < 0) 286cfc8dc6fSKaiGai Kohei return rc; 287aa98d7cfSKaiGai Kohei if (rc > 0) 288826cae2fSAl Viro set_cached_acl(inode, ACL_TYPE_ACCESS, acl); 289cfc8dc6fSKaiGai Kohei 290826cae2fSAl Viro posix_acl_release(acl); 291aa98d7cfSKaiGai Kohei } 292cfc8dc6fSKaiGai Kohei return 0; 293cfc8dc6fSKaiGai Kohei } 294cfc8dc6fSKaiGai Kohei 295cfc8dc6fSKaiGai Kohei int jffs2_init_acl_post(struct inode *inode) 296cfc8dc6fSKaiGai Kohei { 297cfc8dc6fSKaiGai Kohei int rc; 298cfc8dc6fSKaiGai Kohei 299290c263bSAl Viro if (inode->i_default_acl) { 300290c263bSAl Viro rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl); 301cfc8dc6fSKaiGai Kohei if (rc) 302cfc8dc6fSKaiGai Kohei return rc; 303cfc8dc6fSKaiGai Kohei } 304cfc8dc6fSKaiGai Kohei 305290c263bSAl Viro if (inode->i_acl) { 306290c263bSAl Viro rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl); 307cfc8dc6fSKaiGai Kohei if (rc) 308cfc8dc6fSKaiGai Kohei return rc; 309cfc8dc6fSKaiGai Kohei } 310cfc8dc6fSKaiGai Kohei 3118d6ea587SDavid Woodhouse return 0; 312aa98d7cfSKaiGai Kohei } 313aa98d7cfSKaiGai Kohei 314aa98d7cfSKaiGai Kohei int jffs2_acl_chmod(struct inode *inode) 315aa98d7cfSKaiGai Kohei { 316bc26ab5fSAl Viro struct posix_acl *acl; 317aa98d7cfSKaiGai Kohei int rc; 318aa98d7cfSKaiGai Kohei 319aa98d7cfSKaiGai Kohei if (S_ISLNK(inode->i_mode)) 320aa98d7cfSKaiGai Kohei return -EOPNOTSUPP; 321aa98d7cfSKaiGai Kohei acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); 322aa98d7cfSKaiGai Kohei if (IS_ERR(acl) || !acl) 323aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 324bc26ab5fSAl Viro rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); 325bc26ab5fSAl Viro if (rc) 326bc26ab5fSAl Viro return rc; 327bc26ab5fSAl Viro rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl); 328aa98d7cfSKaiGai Kohei posix_acl_release(acl); 329aa98d7cfSKaiGai Kohei return rc; 330aa98d7cfSKaiGai Kohei } 331aa98d7cfSKaiGai Kohei 332431547b3SChristoph Hellwig static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list, 333431547b3SChristoph Hellwig size_t list_size, const char *name, size_t name_len, int type) 334aa98d7cfSKaiGai Kohei { 335aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); 336aa98d7cfSKaiGai Kohei 337aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 338aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_ACCESS); 339aa98d7cfSKaiGai Kohei return retlen; 340aa98d7cfSKaiGai Kohei } 341aa98d7cfSKaiGai Kohei 342431547b3SChristoph Hellwig static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list, 343431547b3SChristoph Hellwig size_t list_size, const char *name, size_t name_len, int type) 344aa98d7cfSKaiGai Kohei { 345aa98d7cfSKaiGai Kohei const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); 346aa98d7cfSKaiGai Kohei 347aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) 348aa98d7cfSKaiGai Kohei strcpy(list, POSIX_ACL_XATTR_DEFAULT); 349aa98d7cfSKaiGai Kohei return retlen; 350aa98d7cfSKaiGai Kohei } 351aa98d7cfSKaiGai Kohei 352431547b3SChristoph Hellwig static int jffs2_acl_getxattr(struct dentry *dentry, const char *name, 353431547b3SChristoph Hellwig void *buffer, size_t size, int type) 354aa98d7cfSKaiGai Kohei { 355aa98d7cfSKaiGai Kohei struct posix_acl *acl; 356aa98d7cfSKaiGai Kohei int rc; 357aa98d7cfSKaiGai Kohei 358431547b3SChristoph Hellwig if (name[0] != '\0') 359431547b3SChristoph Hellwig return -EINVAL; 360431547b3SChristoph Hellwig 361431547b3SChristoph Hellwig acl = jffs2_get_acl(dentry->d_inode, type); 362aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 363aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 364aa98d7cfSKaiGai Kohei if (!acl) 365aa98d7cfSKaiGai Kohei return -ENODATA; 366aa98d7cfSKaiGai Kohei rc = posix_acl_to_xattr(acl, buffer, size); 367aa98d7cfSKaiGai Kohei posix_acl_release(acl); 368aa98d7cfSKaiGai Kohei 369aa98d7cfSKaiGai Kohei return rc; 370aa98d7cfSKaiGai Kohei } 371aa98d7cfSKaiGai Kohei 372431547b3SChristoph Hellwig static int jffs2_acl_setxattr(struct dentry *dentry, const char *name, 373431547b3SChristoph Hellwig const void *value, size_t size, int flags, int type) 374aa98d7cfSKaiGai Kohei { 375aa98d7cfSKaiGai Kohei struct posix_acl *acl; 376aa98d7cfSKaiGai Kohei int rc; 377aa98d7cfSKaiGai Kohei 378431547b3SChristoph Hellwig if (name[0] != '\0') 379431547b3SChristoph Hellwig return -EINVAL; 3802e149670SSerge E. Hallyn if (!inode_owner_or_capable(dentry->d_inode)) 381aa98d7cfSKaiGai Kohei return -EPERM; 382aa98d7cfSKaiGai Kohei 383aa98d7cfSKaiGai Kohei if (value) { 384aa98d7cfSKaiGai Kohei acl = posix_acl_from_xattr(value, size); 385aa98d7cfSKaiGai Kohei if (IS_ERR(acl)) 386aa98d7cfSKaiGai Kohei return PTR_ERR(acl); 387aa98d7cfSKaiGai Kohei if (acl) { 388aa98d7cfSKaiGai Kohei rc = posix_acl_valid(acl); 389aa98d7cfSKaiGai Kohei if (rc) 390aa98d7cfSKaiGai Kohei goto out; 391aa98d7cfSKaiGai Kohei } 392aa98d7cfSKaiGai Kohei } else { 393aa98d7cfSKaiGai Kohei acl = NULL; 394aa98d7cfSKaiGai Kohei } 395431547b3SChristoph Hellwig rc = jffs2_set_acl(dentry->d_inode, type, acl); 396aa98d7cfSKaiGai Kohei out: 397aa98d7cfSKaiGai Kohei posix_acl_release(acl); 398aa98d7cfSKaiGai Kohei return rc; 399aa98d7cfSKaiGai Kohei } 400aa98d7cfSKaiGai Kohei 401365f0cb9SStephen Hemminger const struct xattr_handler jffs2_acl_access_xattr_handler = { 402aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_ACCESS, 403431547b3SChristoph Hellwig .flags = ACL_TYPE_DEFAULT, 404aa98d7cfSKaiGai Kohei .list = jffs2_acl_access_listxattr, 405431547b3SChristoph Hellwig .get = jffs2_acl_getxattr, 406431547b3SChristoph Hellwig .set = jffs2_acl_setxattr, 407aa98d7cfSKaiGai Kohei }; 408aa98d7cfSKaiGai Kohei 409365f0cb9SStephen Hemminger const struct xattr_handler jffs2_acl_default_xattr_handler = { 410aa98d7cfSKaiGai Kohei .prefix = POSIX_ACL_XATTR_DEFAULT, 411431547b3SChristoph Hellwig .flags = ACL_TYPE_DEFAULT, 412aa98d7cfSKaiGai Kohei .list = jffs2_acl_default_listxattr, 413431547b3SChristoph Hellwig .get = jffs2_acl_getxattr, 414431547b3SChristoph Hellwig .set = jffs2_acl_setxattr, 415aa98d7cfSKaiGai Kohei }; 416