147e4937aSGao Xiang // SPDX-License-Identifier: GPL-2.0-only 247e4937aSGao Xiang /* 347e4937aSGao Xiang * Copyright (C) 2017-2018 HUAWEI, Inc. 4592e7cd0SAlexander A. Klimov * https://www.huawei.com/ 5bb88e8daSGao Xiang * Copyright (C) 2021-2022, Alibaba Cloud 647e4937aSGao Xiang */ 747e4937aSGao Xiang #include <linux/security.h> 847e4937aSGao Xiang #include "xattr.h" 947e4937aSGao Xiang 108e823961SJingbo Xu struct erofs_xattr_iter { 1147e4937aSGao Xiang struct super_block *sb; 12bb88e8daSGao Xiang struct erofs_buf buf; 13eba67eb6SJingbo Xu erofs_off_t pos; 1447e4937aSGao Xiang void *kaddr; 158e823961SJingbo Xu 168e823961SJingbo Xu char *buffer; 178e823961SJingbo Xu int buffer_size, buffer_ofs; 188e823961SJingbo Xu 198e823961SJingbo Xu /* getxattr */ 208e823961SJingbo Xu int index, infix_len; 218e823961SJingbo Xu struct qstr name; 228e823961SJingbo Xu 238e823961SJingbo Xu /* listxattr */ 248e823961SJingbo Xu struct dentry *dentry; 2547e4937aSGao Xiang }; 2647e4937aSGao Xiang 276020ffe7SJingbo Xu static int erofs_init_inode_xattrs(struct inode *inode) 2847e4937aSGao Xiang { 29a5876e24SGao Xiang struct erofs_inode *const vi = EROFS_I(inode); 308e823961SJingbo Xu struct erofs_xattr_iter it; 3147e4937aSGao Xiang unsigned int i; 3247e4937aSGao Xiang struct erofs_xattr_ibody_header *ih; 33b780d3fcSGao Xiang struct super_block *sb = inode->i_sb; 3447e4937aSGao Xiang int ret = 0; 3547e4937aSGao Xiang 3647e4937aSGao Xiang /* the most case is that xattrs of this inode are initialized. */ 37ce063129SGao Xiang if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) { 38ce063129SGao Xiang /* 39ce063129SGao Xiang * paired with smp_mb() at the end of the function to ensure 40ce063129SGao Xiang * fields will only be observed after the bit is set. 41ce063129SGao Xiang */ 42ce063129SGao Xiang smp_mb(); 4347e4937aSGao Xiang return 0; 44ce063129SGao Xiang } 4547e4937aSGao Xiang 46a5876e24SGao Xiang if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE)) 4747e4937aSGao Xiang return -ERESTARTSYS; 4847e4937aSGao Xiang 4947e4937aSGao Xiang /* someone has initialized xattrs for us? */ 50a5876e24SGao Xiang if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) 5147e4937aSGao Xiang goto out_unlock; 5247e4937aSGao Xiang 5347e4937aSGao Xiang /* 5447e4937aSGao Xiang * bypass all xattr operations if ->xattr_isize is not greater than 5547e4937aSGao Xiang * sizeof(struct erofs_xattr_ibody_header), in detail: 5647e4937aSGao Xiang * 1) it is not enough to contain erofs_xattr_ibody_header then 5747e4937aSGao Xiang * ->xattr_isize should be 0 (it means no xattr); 5847e4937aSGao Xiang * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk 5947e4937aSGao Xiang * undefined right now (maybe use later with some new sb feature). 6047e4937aSGao Xiang */ 6147e4937aSGao Xiang if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) { 62b780d3fcSGao Xiang erofs_err(sb, 634f761fa2SGao Xiang "xattr_isize %d of nid %llu is not supported yet", 6447e4937aSGao Xiang vi->xattr_isize, vi->nid); 6547e4937aSGao Xiang ret = -EOPNOTSUPP; 6647e4937aSGao Xiang goto out_unlock; 6747e4937aSGao Xiang } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) { 688d8a09b0SGao Xiang if (vi->xattr_isize) { 69b780d3fcSGao Xiang erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid); 7047e4937aSGao Xiang DBG_BUGON(1); 7147e4937aSGao Xiang ret = -EFSCORRUPTED; 7247e4937aSGao Xiang goto out_unlock; /* xattr ondisk layout error */ 7347e4937aSGao Xiang } 7447e4937aSGao Xiang ret = -ENOATTR; 7547e4937aSGao Xiang goto out_unlock; 7647e4937aSGao Xiang } 7747e4937aSGao Xiang 78bb88e8daSGao Xiang it.buf = __EROFS_BUF_INITIALIZER; 799c39ec0cSJingbo Xu erofs_init_metabuf(&it.buf, sb); 80eba67eb6SJingbo Xu it.pos = erofs_iloc(inode) + vi->inode_isize; 8147e4937aSGao Xiang 82bb88e8daSGao Xiang /* read in shared xattr array (non-atomic, see kmalloc below) */ 83eba67eb6SJingbo Xu it.kaddr = erofs_bread(&it.buf, erofs_blknr(sb, it.pos), EROFS_KMAP); 84bb88e8daSGao Xiang if (IS_ERR(it.kaddr)) { 85bb88e8daSGao Xiang ret = PTR_ERR(it.kaddr); 8647e4937aSGao Xiang goto out_unlock; 8747e4937aSGao Xiang } 8847e4937aSGao Xiang 89eba67eb6SJingbo Xu ih = it.kaddr + erofs_blkoff(sb, it.pos); 9047e4937aSGao Xiang vi->xattr_shared_count = ih->h_shared_count; 9147e4937aSGao Xiang vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count, 9247e4937aSGao Xiang sizeof(uint), GFP_KERNEL); 9347e4937aSGao Xiang if (!vi->xattr_shared_xattrs) { 94bb88e8daSGao Xiang erofs_put_metabuf(&it.buf); 9547e4937aSGao Xiang ret = -ENOMEM; 9647e4937aSGao Xiang goto out_unlock; 9747e4937aSGao Xiang } 9847e4937aSGao Xiang 9947e4937aSGao Xiang /* let's skip ibody header */ 100eba67eb6SJingbo Xu it.pos += sizeof(struct erofs_xattr_ibody_header); 10147e4937aSGao Xiang 10247e4937aSGao Xiang for (i = 0; i < vi->xattr_shared_count; ++i) { 103eba67eb6SJingbo Xu it.kaddr = erofs_bread(&it.buf, erofs_blknr(sb, it.pos), 104eba67eb6SJingbo Xu EROFS_KMAP); 105bb88e8daSGao Xiang if (IS_ERR(it.kaddr)) { 10647e4937aSGao Xiang kfree(vi->xattr_shared_xattrs); 10747e4937aSGao Xiang vi->xattr_shared_xattrs = NULL; 108bb88e8daSGao Xiang ret = PTR_ERR(it.kaddr); 10947e4937aSGao Xiang goto out_unlock; 11047e4937aSGao Xiang } 111eba67eb6SJingbo Xu vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *) 112eba67eb6SJingbo Xu (it.kaddr + erofs_blkoff(sb, it.pos))); 113eba67eb6SJingbo Xu it.pos += sizeof(__le32); 11447e4937aSGao Xiang } 115bb88e8daSGao Xiang erofs_put_metabuf(&it.buf); 11647e4937aSGao Xiang 117ce063129SGao Xiang /* paired with smp_mb() at the beginning of the function. */ 118ce063129SGao Xiang smp_mb(); 119a5876e24SGao Xiang set_bit(EROFS_I_EA_INITED_BIT, &vi->flags); 12047e4937aSGao Xiang 12147e4937aSGao Xiang out_unlock: 122a5876e24SGao Xiang clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags); 12347e4937aSGao Xiang return ret; 12447e4937aSGao Xiang } 12547e4937aSGao Xiang 12647e4937aSGao Xiang static bool erofs_xattr_user_list(struct dentry *dentry) 12747e4937aSGao Xiang { 128e6242465SGao Xiang return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER); 12947e4937aSGao Xiang } 13047e4937aSGao Xiang 13147e4937aSGao Xiang static bool erofs_xattr_trusted_list(struct dentry *dentry) 13247e4937aSGao Xiang { 13347e4937aSGao Xiang return capable(CAP_SYS_ADMIN); 13447e4937aSGao Xiang } 13547e4937aSGao Xiang 13647e4937aSGao Xiang static int erofs_xattr_generic_get(const struct xattr_handler *handler, 13747e4937aSGao Xiang struct dentry *unused, struct inode *inode, 13847e4937aSGao Xiang const char *name, void *buffer, size_t size) 13947e4937aSGao Xiang { 140b05f30bcSJingbo Xu if (handler->flags == EROFS_XATTR_INDEX_USER && 141b05f30bcSJingbo Xu !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER)) 14247e4937aSGao Xiang return -EOPNOTSUPP; 14347e4937aSGao Xiang 14447e4937aSGao Xiang return erofs_getxattr(inode, handler->flags, name, buffer, size); 14547e4937aSGao Xiang } 14647e4937aSGao Xiang 14747e4937aSGao Xiang const struct xattr_handler erofs_xattr_user_handler = { 14847e4937aSGao Xiang .prefix = XATTR_USER_PREFIX, 14947e4937aSGao Xiang .flags = EROFS_XATTR_INDEX_USER, 15047e4937aSGao Xiang .list = erofs_xattr_user_list, 15147e4937aSGao Xiang .get = erofs_xattr_generic_get, 15247e4937aSGao Xiang }; 15347e4937aSGao Xiang 15447e4937aSGao Xiang const struct xattr_handler erofs_xattr_trusted_handler = { 15547e4937aSGao Xiang .prefix = XATTR_TRUSTED_PREFIX, 15647e4937aSGao Xiang .flags = EROFS_XATTR_INDEX_TRUSTED, 15747e4937aSGao Xiang .list = erofs_xattr_trusted_list, 15847e4937aSGao Xiang .get = erofs_xattr_generic_get, 15947e4937aSGao Xiang }; 16047e4937aSGao Xiang 16147e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_SECURITY 16247e4937aSGao Xiang const struct xattr_handler __maybe_unused erofs_xattr_security_handler = { 16347e4937aSGao Xiang .prefix = XATTR_SECURITY_PREFIX, 16447e4937aSGao Xiang .flags = EROFS_XATTR_INDEX_SECURITY, 16547e4937aSGao Xiang .get = erofs_xattr_generic_get, 16647e4937aSGao Xiang }; 16747e4937aSGao Xiang #endif 16847e4937aSGao Xiang 16947e4937aSGao Xiang const struct xattr_handler *erofs_xattr_handlers[] = { 17047e4937aSGao Xiang &erofs_xattr_user_handler, 17147e4937aSGao Xiang &erofs_xattr_trusted_handler, 17247e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_SECURITY 17347e4937aSGao Xiang &erofs_xattr_security_handler, 17447e4937aSGao Xiang #endif 17547e4937aSGao Xiang NULL, 17647e4937aSGao Xiang }; 17747e4937aSGao Xiang 178*f02615ebSJingbo Xu static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it, 179*f02615ebSJingbo Xu unsigned int len) 18047e4937aSGao Xiang { 181*f02615ebSJingbo Xu unsigned int slice, processed; 182*f02615ebSJingbo Xu struct super_block *sb = it->sb; 183*f02615ebSJingbo Xu void *src; 18447e4937aSGao Xiang 185*f02615ebSJingbo Xu for (processed = 0; processed < len; processed += slice) { 186*f02615ebSJingbo Xu it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos), 187*f02615ebSJingbo Xu EROFS_KMAP); 188*f02615ebSJingbo Xu if (IS_ERR(it->kaddr)) 189*f02615ebSJingbo Xu return PTR_ERR(it->kaddr); 190*f02615ebSJingbo Xu 191*f02615ebSJingbo Xu src = it->kaddr + erofs_blkoff(sb, it->pos); 192*f02615ebSJingbo Xu slice = min_t(unsigned int, sb->s_blocksize - 193*f02615ebSJingbo Xu erofs_blkoff(sb, it->pos), len - processed); 194*f02615ebSJingbo Xu memcpy(it->buffer + it->buffer_ofs, src, slice); 195*f02615ebSJingbo Xu it->buffer_ofs += slice; 196*f02615ebSJingbo Xu it->pos += slice; 197*f02615ebSJingbo Xu } 198*f02615ebSJingbo Xu return 0; 199*f02615ebSJingbo Xu } 200*f02615ebSJingbo Xu 201*f02615ebSJingbo Xu static int erofs_listxattr_foreach(struct erofs_xattr_iter *it) 202*f02615ebSJingbo Xu { 203*f02615ebSJingbo Xu struct erofs_xattr_entry entry; 204*f02615ebSJingbo Xu unsigned int base_index, name_total, prefix_len, infix_len = 0; 205*f02615ebSJingbo Xu const char *prefix, *infix = NULL; 206*f02615ebSJingbo Xu int err; 207*f02615ebSJingbo Xu 208*f02615ebSJingbo Xu /* 1. handle xattr entry */ 209*f02615ebSJingbo Xu entry = *(struct erofs_xattr_entry *) 210*f02615ebSJingbo Xu (it->kaddr + erofs_blkoff(it->sb, it->pos)); 211*f02615ebSJingbo Xu it->pos += sizeof(struct erofs_xattr_entry); 212*f02615ebSJingbo Xu 213*f02615ebSJingbo Xu base_index = entry.e_name_index; 214*f02615ebSJingbo Xu if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) { 2158e823961SJingbo Xu struct erofs_sb_info *sbi = EROFS_SB(it->sb); 21682bc1ef4SJingbo Xu struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + 217*f02615ebSJingbo Xu (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); 21847e4937aSGao Xiang 21982bc1ef4SJingbo Xu if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) 220*f02615ebSJingbo Xu return 0; 22182bc1ef4SJingbo Xu infix = pf->prefix->infix; 22282bc1ef4SJingbo Xu infix_len = pf->infix_len; 22382bc1ef4SJingbo Xu base_index = pf->prefix->base_index; 22482bc1ef4SJingbo Xu } 22582bc1ef4SJingbo Xu 22661d325dcSLinus Torvalds prefix = erofs_xattr_prefix(base_index, it->dentry); 227a5488f29SChristian Brauner if (!prefix) 228*f02615ebSJingbo Xu return 0; 22947e4937aSGao Xiang prefix_len = strlen(prefix); 230*f02615ebSJingbo Xu name_total = prefix_len + infix_len + entry.e_name_len + 1; 23147e4937aSGao Xiang 23247e4937aSGao Xiang if (!it->buffer) { 233*f02615ebSJingbo Xu it->buffer_ofs += name_total; 234*f02615ebSJingbo Xu return 0; 23547e4937aSGao Xiang } 23647e4937aSGao Xiang 237*f02615ebSJingbo Xu if (it->buffer_ofs + name_total > it->buffer_size) 23847e4937aSGao Xiang return -ERANGE; 23947e4937aSGao Xiang 24047e4937aSGao Xiang memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len); 24182bc1ef4SJingbo Xu memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len); 24282bc1ef4SJingbo Xu it->buffer_ofs += prefix_len + infix_len; 24347e4937aSGao Xiang 244*f02615ebSJingbo Xu /* 2. handle xattr name */ 245*f02615ebSJingbo Xu err = erofs_xattr_copy_to_buffer(it, entry.e_name_len); 246*f02615ebSJingbo Xu if (err) 247*f02615ebSJingbo Xu return err; 24847e4937aSGao Xiang 24947e4937aSGao Xiang it->buffer[it->buffer_ofs++] = '\0'; 250*f02615ebSJingbo Xu return 0; 25147e4937aSGao Xiang } 25247e4937aSGao Xiang 253*f02615ebSJingbo Xu static int erofs_getxattr_foreach(struct erofs_xattr_iter *it) 254*f02615ebSJingbo Xu { 255*f02615ebSJingbo Xu struct super_block *sb = it->sb; 256*f02615ebSJingbo Xu struct erofs_xattr_entry entry; 257*f02615ebSJingbo Xu unsigned int slice, processed, value_sz; 258*f02615ebSJingbo Xu 259*f02615ebSJingbo Xu /* 1. handle xattr entry */ 260*f02615ebSJingbo Xu entry = *(struct erofs_xattr_entry *) 261*f02615ebSJingbo Xu (it->kaddr + erofs_blkoff(sb, it->pos)); 262*f02615ebSJingbo Xu it->pos += sizeof(struct erofs_xattr_entry); 263*f02615ebSJingbo Xu value_sz = le16_to_cpu(entry.e_value_size); 264*f02615ebSJingbo Xu 265*f02615ebSJingbo Xu /* should also match the infix for long name prefixes */ 266*f02615ebSJingbo Xu if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) { 267*f02615ebSJingbo Xu struct erofs_sb_info *sbi = EROFS_SB(sb); 268*f02615ebSJingbo Xu struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + 269*f02615ebSJingbo Xu (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); 270*f02615ebSJingbo Xu 271*f02615ebSJingbo Xu if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) 272*f02615ebSJingbo Xu return -ENOATTR; 273*f02615ebSJingbo Xu 274*f02615ebSJingbo Xu if (it->index != pf->prefix->base_index || 275*f02615ebSJingbo Xu it->name.len != entry.e_name_len + pf->infix_len) 276*f02615ebSJingbo Xu return -ENOATTR; 277*f02615ebSJingbo Xu 278*f02615ebSJingbo Xu if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len)) 279*f02615ebSJingbo Xu return -ENOATTR; 280*f02615ebSJingbo Xu 281*f02615ebSJingbo Xu it->infix_len = pf->infix_len; 282*f02615ebSJingbo Xu } else { 283*f02615ebSJingbo Xu if (it->index != entry.e_name_index || 284*f02615ebSJingbo Xu it->name.len != entry.e_name_len) 285*f02615ebSJingbo Xu return -ENOATTR; 286*f02615ebSJingbo Xu 287*f02615ebSJingbo Xu it->infix_len = 0; 288*f02615ebSJingbo Xu } 289*f02615ebSJingbo Xu 290*f02615ebSJingbo Xu /* 2. handle xattr name */ 291*f02615ebSJingbo Xu for (processed = 0; processed < entry.e_name_len; processed += slice) { 292*f02615ebSJingbo Xu it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos), 293*f02615ebSJingbo Xu EROFS_KMAP); 294*f02615ebSJingbo Xu if (IS_ERR(it->kaddr)) 295*f02615ebSJingbo Xu return PTR_ERR(it->kaddr); 296*f02615ebSJingbo Xu 297*f02615ebSJingbo Xu slice = min_t(unsigned int, 298*f02615ebSJingbo Xu sb->s_blocksize - erofs_blkoff(sb, it->pos), 299*f02615ebSJingbo Xu entry.e_name_len - processed); 300*f02615ebSJingbo Xu if (memcmp(it->name.name + it->infix_len + processed, 301*f02615ebSJingbo Xu it->kaddr + erofs_blkoff(sb, it->pos), slice)) 302*f02615ebSJingbo Xu return -ENOATTR; 303*f02615ebSJingbo Xu it->pos += slice; 304*f02615ebSJingbo Xu } 305*f02615ebSJingbo Xu 306*f02615ebSJingbo Xu /* 3. handle xattr value */ 307*f02615ebSJingbo Xu if (!it->buffer) { 308*f02615ebSJingbo Xu it->buffer_ofs = value_sz; 309*f02615ebSJingbo Xu return 0; 310*f02615ebSJingbo Xu } 311*f02615ebSJingbo Xu 312*f02615ebSJingbo Xu if (it->buffer_size < value_sz) 313*f02615ebSJingbo Xu return -ERANGE; 314*f02615ebSJingbo Xu 315*f02615ebSJingbo Xu return erofs_xattr_copy_to_buffer(it, value_sz); 316*f02615ebSJingbo Xu } 31747e4937aSGao Xiang 3184b077b50SJingbo Xu static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it, 3194b077b50SJingbo Xu struct inode *inode, bool getxattr) 32047e4937aSGao Xiang { 3214b077b50SJingbo Xu struct erofs_inode *const vi = EROFS_I(inode); 322*f02615ebSJingbo Xu unsigned int xattr_header_sz, remaining, entry_sz; 323*f02615ebSJingbo Xu erofs_off_t next_pos; 32447e4937aSGao Xiang int ret; 32547e4937aSGao Xiang 3264b077b50SJingbo Xu xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) + 3274b077b50SJingbo Xu sizeof(u32) * vi->xattr_shared_count; 3284b077b50SJingbo Xu if (xattr_header_sz >= vi->xattr_isize) { 3294b077b50SJingbo Xu DBG_BUGON(xattr_header_sz > vi->xattr_isize); 3304b077b50SJingbo Xu return -ENOATTR; 3314b077b50SJingbo Xu } 33247e4937aSGao Xiang 333*f02615ebSJingbo Xu remaining = vi->xattr_isize - xattr_header_sz; 3344b077b50SJingbo Xu it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz; 335*f02615ebSJingbo Xu 336*f02615ebSJingbo Xu while (remaining) { 3374b077b50SJingbo Xu it->kaddr = erofs_bread(&it->buf, erofs_blknr(it->sb, it->pos), 3384b077b50SJingbo Xu EROFS_KMAP); 3394b077b50SJingbo Xu if (IS_ERR(it->kaddr)) 3404b077b50SJingbo Xu return PTR_ERR(it->kaddr); 3414b077b50SJingbo Xu 342*f02615ebSJingbo Xu entry_sz = erofs_xattr_entry_size(it->kaddr + 343*f02615ebSJingbo Xu erofs_blkoff(it->sb, it->pos)); 344*f02615ebSJingbo Xu /* xattr on-disk corruption: xattr entry beyond xattr_isize */ 345*f02615ebSJingbo Xu if (remaining < entry_sz) { 346*f02615ebSJingbo Xu DBG_BUGON(1); 347*f02615ebSJingbo Xu return -EFSCORRUPTED; 348*f02615ebSJingbo Xu } 349*f02615ebSJingbo Xu remaining -= entry_sz; 350*f02615ebSJingbo Xu next_pos = it->pos + entry_sz; 3514b077b50SJingbo Xu 352*f02615ebSJingbo Xu if (getxattr) 353*f02615ebSJingbo Xu ret = erofs_getxattr_foreach(it); 354*f02615ebSJingbo Xu else 355*f02615ebSJingbo Xu ret = erofs_listxattr_foreach(it); 3564b077b50SJingbo Xu if ((getxattr && ret != -ENOATTR) || (!getxattr && ret)) 35747e4937aSGao Xiang break; 358*f02615ebSJingbo Xu 359*f02615ebSJingbo Xu it->pos = next_pos; 36047e4937aSGao Xiang } 3614b077b50SJingbo Xu return ret; 36247e4937aSGao Xiang } 36347e4937aSGao Xiang 3644b077b50SJingbo Xu static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it, 3654b077b50SJingbo Xu struct inode *inode, bool getxattr) 36647e4937aSGao Xiang { 367a5876e24SGao Xiang struct erofs_inode *const vi = EROFS_I(inode); 3688e823961SJingbo Xu struct super_block *const sb = it->sb; 369eba67eb6SJingbo Xu struct erofs_sb_info *sbi = EROFS_SB(sb); 370eba67eb6SJingbo Xu unsigned int i; 3714b077b50SJingbo Xu int ret = -ENOATTR; 3724b077b50SJingbo Xu 37347e4937aSGao Xiang for (i = 0; i < vi->xattr_shared_count; ++i) { 3748e823961SJingbo Xu it->pos = erofs_pos(sb, sbi->xattr_blkaddr) + 375eba67eb6SJingbo Xu vi->xattr_shared_xattrs[i] * sizeof(__le32); 3768e823961SJingbo Xu it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos), 3778e823961SJingbo Xu EROFS_KMAP); 3788e823961SJingbo Xu if (IS_ERR(it->kaddr)) 3798e823961SJingbo Xu return PTR_ERR(it->kaddr); 38047e4937aSGao Xiang 381*f02615ebSJingbo Xu if (getxattr) 382*f02615ebSJingbo Xu ret = erofs_getxattr_foreach(it); 383*f02615ebSJingbo Xu else 384*f02615ebSJingbo Xu ret = erofs_listxattr_foreach(it); 3854b077b50SJingbo Xu if ((getxattr && ret != -ENOATTR) || (!getxattr && ret)) 38647e4937aSGao Xiang break; 38747e4937aSGao Xiang } 3884b077b50SJingbo Xu return ret; 38947e4937aSGao Xiang } 39047e4937aSGao Xiang 3914b077b50SJingbo Xu int erofs_getxattr(struct inode *inode, int index, const char *name, 3924b077b50SJingbo Xu void *buffer, size_t buffer_size) 39347e4937aSGao Xiang { 39447e4937aSGao Xiang int ret; 3958e823961SJingbo Xu struct erofs_xattr_iter it; 39647e4937aSGao Xiang 3974b077b50SJingbo Xu if (!name) 3984b077b50SJingbo Xu return -EINVAL; 3994b077b50SJingbo Xu 4004b077b50SJingbo Xu ret = erofs_init_inode_xattrs(inode); 4014b077b50SJingbo Xu if (ret) 4024b077b50SJingbo Xu return ret; 4034b077b50SJingbo Xu 4044b077b50SJingbo Xu it.index = index; 4054b077b50SJingbo Xu it.name = (struct qstr)QSTR_INIT(name, strlen(name)); 4064b077b50SJingbo Xu if (it.name.len > EROFS_NAME_LEN) 4074b077b50SJingbo Xu return -ERANGE; 4084b077b50SJingbo Xu 4094b077b50SJingbo Xu it.sb = inode->i_sb; 4104b077b50SJingbo Xu it.buf = __EROFS_BUF_INITIALIZER; 4114b077b50SJingbo Xu erofs_init_metabuf(&it.buf, it.sb); 4124b077b50SJingbo Xu it.buffer = buffer; 4134b077b50SJingbo Xu it.buffer_size = buffer_size; 4144b077b50SJingbo Xu it.buffer_ofs = 0; 4154b077b50SJingbo Xu 4164b077b50SJingbo Xu ret = erofs_xattr_iter_inline(&it, inode, true); 4174b077b50SJingbo Xu if (ret == -ENOATTR) 4184b077b50SJingbo Xu ret = erofs_xattr_iter_shared(&it, inode, true); 4194b077b50SJingbo Xu erofs_put_metabuf(&it.buf); 4204b077b50SJingbo Xu return ret ? ret : it.buffer_ofs; 4214b077b50SJingbo Xu } 4224b077b50SJingbo Xu 4234b077b50SJingbo Xu ssize_t erofs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 4244b077b50SJingbo Xu { 4254b077b50SJingbo Xu int ret; 4264b077b50SJingbo Xu struct erofs_xattr_iter it; 4274b077b50SJingbo Xu struct inode *inode = d_inode(dentry); 4284b077b50SJingbo Xu 4294b077b50SJingbo Xu ret = erofs_init_inode_xattrs(inode); 430926d1650SGao Xiang if (ret == -ENOATTR) 431926d1650SGao Xiang return 0; 43247e4937aSGao Xiang if (ret) 43347e4937aSGao Xiang return ret; 43447e4937aSGao Xiang 4358e823961SJingbo Xu it.sb = dentry->d_sb; 4368e823961SJingbo Xu it.buf = __EROFS_BUF_INITIALIZER; 4378e823961SJingbo Xu erofs_init_metabuf(&it.buf, it.sb); 43847e4937aSGao Xiang it.dentry = dentry; 43947e4937aSGao Xiang it.buffer = buffer; 44047e4937aSGao Xiang it.buffer_size = buffer_size; 44147e4937aSGao Xiang it.buffer_ofs = 0; 44247e4937aSGao Xiang 4434b077b50SJingbo Xu ret = erofs_xattr_iter_inline(&it, inode, false); 4444b077b50SJingbo Xu if (!ret || ret == -ENOATTR) 4454b077b50SJingbo Xu ret = erofs_xattr_iter_shared(&it, inode, false); 4464b077b50SJingbo Xu if (ret == -ENOATTR) 4474b077b50SJingbo Xu ret = 0; 4488e823961SJingbo Xu erofs_put_metabuf(&it.buf); 4494b077b50SJingbo Xu return ret ? ret : it.buffer_ofs; 45047e4937aSGao Xiang } 45147e4937aSGao Xiang 4529e382914SJingbo Xu void erofs_xattr_prefixes_cleanup(struct super_block *sb) 4539e382914SJingbo Xu { 4549e382914SJingbo Xu struct erofs_sb_info *sbi = EROFS_SB(sb); 4559e382914SJingbo Xu int i; 4569e382914SJingbo Xu 4579e382914SJingbo Xu if (sbi->xattr_prefixes) { 4589e382914SJingbo Xu for (i = 0; i < sbi->xattr_prefix_count; i++) 4599e382914SJingbo Xu kfree(sbi->xattr_prefixes[i].prefix); 4609e382914SJingbo Xu kfree(sbi->xattr_prefixes); 4619e382914SJingbo Xu sbi->xattr_prefixes = NULL; 4629e382914SJingbo Xu } 4639e382914SJingbo Xu } 4649e382914SJingbo Xu 4659e382914SJingbo Xu int erofs_xattr_prefixes_init(struct super_block *sb) 4669e382914SJingbo Xu { 4679e382914SJingbo Xu struct erofs_sb_info *sbi = EROFS_SB(sb); 4689e382914SJingbo Xu struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 4699e382914SJingbo Xu erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2; 4709e382914SJingbo Xu struct erofs_xattr_prefix_item *pfs; 4719e382914SJingbo Xu int ret = 0, i, len; 4729e382914SJingbo Xu 4739e382914SJingbo Xu if (!sbi->xattr_prefix_count) 4749e382914SJingbo Xu return 0; 4759e382914SJingbo Xu 4769e382914SJingbo Xu pfs = kzalloc(sbi->xattr_prefix_count * sizeof(*pfs), GFP_KERNEL); 4779e382914SJingbo Xu if (!pfs) 4789e382914SJingbo Xu return -ENOMEM; 4799e382914SJingbo Xu 4800a17567bSJingbo Xu if (sbi->packed_inode) 4819e382914SJingbo Xu buf.inode = sbi->packed_inode; 4829e382914SJingbo Xu else 4839e382914SJingbo Xu erofs_init_metabuf(&buf, sb); 4849e382914SJingbo Xu 4859e382914SJingbo Xu for (i = 0; i < sbi->xattr_prefix_count; i++) { 4869e382914SJingbo Xu void *ptr = erofs_read_metadata(sb, &buf, &pos, &len); 4879e382914SJingbo Xu 4889e382914SJingbo Xu if (IS_ERR(ptr)) { 4899e382914SJingbo Xu ret = PTR_ERR(ptr); 4909e382914SJingbo Xu break; 4919e382914SJingbo Xu } else if (len < sizeof(*pfs->prefix) || 4929e382914SJingbo Xu len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) { 4939e382914SJingbo Xu kfree(ptr); 4949e382914SJingbo Xu ret = -EFSCORRUPTED; 4959e382914SJingbo Xu break; 4969e382914SJingbo Xu } 4979e382914SJingbo Xu pfs[i].prefix = ptr; 4989e382914SJingbo Xu pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix); 4999e382914SJingbo Xu } 5009e382914SJingbo Xu 5019e382914SJingbo Xu erofs_put_metabuf(&buf); 5029e382914SJingbo Xu sbi->xattr_prefixes = pfs; 5039e382914SJingbo Xu if (ret) 5049e382914SJingbo Xu erofs_xattr_prefixes_cleanup(sb); 5059e382914SJingbo Xu return ret; 5069e382914SJingbo Xu } 5079e382914SJingbo Xu 50847e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_POSIX_ACL 5090cad6246SMiklos Szeredi struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu) 51047e4937aSGao Xiang { 51147e4937aSGao Xiang struct posix_acl *acl; 51247e4937aSGao Xiang int prefix, rc; 51347e4937aSGao Xiang char *value = NULL; 51447e4937aSGao Xiang 5150cad6246SMiklos Szeredi if (rcu) 5160cad6246SMiklos Szeredi return ERR_PTR(-ECHILD); 5170cad6246SMiklos Szeredi 51847e4937aSGao Xiang switch (type) { 51947e4937aSGao Xiang case ACL_TYPE_ACCESS: 52047e4937aSGao Xiang prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS; 52147e4937aSGao Xiang break; 52247e4937aSGao Xiang case ACL_TYPE_DEFAULT: 52347e4937aSGao Xiang prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT; 52447e4937aSGao Xiang break; 52547e4937aSGao Xiang default: 52647e4937aSGao Xiang return ERR_PTR(-EINVAL); 52747e4937aSGao Xiang } 52847e4937aSGao Xiang 52947e4937aSGao Xiang rc = erofs_getxattr(inode, prefix, "", NULL, 0); 53047e4937aSGao Xiang if (rc > 0) { 53147e4937aSGao Xiang value = kmalloc(rc, GFP_KERNEL); 53247e4937aSGao Xiang if (!value) 53347e4937aSGao Xiang return ERR_PTR(-ENOMEM); 53447e4937aSGao Xiang rc = erofs_getxattr(inode, prefix, "", value, rc); 53547e4937aSGao Xiang } 53647e4937aSGao Xiang 53747e4937aSGao Xiang if (rc == -ENOATTR) 53847e4937aSGao Xiang acl = NULL; 53947e4937aSGao Xiang else if (rc < 0) 54047e4937aSGao Xiang acl = ERR_PTR(rc); 54147e4937aSGao Xiang else 54247e4937aSGao Xiang acl = posix_acl_from_xattr(&init_user_ns, value, rc); 54347e4937aSGao Xiang kfree(value); 54447e4937aSGao Xiang return acl; 54547e4937aSGao Xiang } 54647e4937aSGao Xiang #endif 547