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/ 547e4937aSGao Xiang */ 647e4937aSGao Xiang #include "xattr.h" 747e4937aSGao Xiang 847e4937aSGao Xiang #include <trace/events/erofs.h> 947e4937aSGao Xiang 100dcd3c94SGao Xiang /* 110dcd3c94SGao Xiang * if inode is successfully read, return its inode page (or sometimes 120dcd3c94SGao Xiang * the inode payload page if it's an extended inode) in order to fill 130dcd3c94SGao Xiang * inline data if possible. 140dcd3c94SGao Xiang */ 150dcd3c94SGao Xiang static struct page *erofs_read_inode(struct inode *inode, 160dcd3c94SGao Xiang unsigned int *ofs) 1747e4937aSGao Xiang { 180dcd3c94SGao Xiang struct super_block *sb = inode->i_sb; 190dcd3c94SGao Xiang struct erofs_sb_info *sbi = EROFS_SB(sb); 20a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 210dcd3c94SGao Xiang const erofs_off_t inode_loc = iloc(sbi, vi->nid); 228a765682SGao Xiang 230dcd3c94SGao Xiang erofs_blk_t blkaddr, nblks = 0; 240dcd3c94SGao Xiang struct page *page; 250dcd3c94SGao Xiang struct erofs_inode_compact *dic; 260dcd3c94SGao Xiang struct erofs_inode_extended *die, *copied = NULL; 270dcd3c94SGao Xiang unsigned int ifmt; 280dcd3c94SGao Xiang int err; 290dcd3c94SGao Xiang 300dcd3c94SGao Xiang blkaddr = erofs_blknr(inode_loc); 310dcd3c94SGao Xiang *ofs = erofs_blkoff(inode_loc); 320dcd3c94SGao Xiang 330dcd3c94SGao Xiang erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u", 340dcd3c94SGao Xiang __func__, vi->nid, *ofs, blkaddr); 350dcd3c94SGao Xiang 360dcd3c94SGao Xiang page = erofs_get_meta_page(sb, blkaddr); 370dcd3c94SGao Xiang if (IS_ERR(page)) { 380dcd3c94SGao Xiang erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", 390dcd3c94SGao Xiang vi->nid, PTR_ERR(page)); 400dcd3c94SGao Xiang return page; 410dcd3c94SGao Xiang } 420dcd3c94SGao Xiang 430dcd3c94SGao Xiang dic = page_address(page) + *ofs; 440dcd3c94SGao Xiang ifmt = le16_to_cpu(dic->i_format); 4547e4937aSGao Xiang 4624a806d8SGao Xiang if (ifmt & ~EROFS_I_ALL) { 4724a806d8SGao Xiang erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu", 4824a806d8SGao Xiang ifmt, vi->nid); 4924a806d8SGao Xiang err = -EOPNOTSUPP; 5024a806d8SGao Xiang goto err_out; 5124a806d8SGao Xiang } 5224a806d8SGao Xiang 538a765682SGao Xiang vi->datalayout = erofs_inode_datalayout(ifmt); 548a765682SGao Xiang if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 554f761fa2SGao Xiang erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu", 568a765682SGao Xiang vi->datalayout, vi->nid); 570dcd3c94SGao Xiang err = -EOPNOTSUPP; 580dcd3c94SGao Xiang goto err_out; 5947e4937aSGao Xiang } 6047e4937aSGao Xiang 618a765682SGao Xiang switch (erofs_inode_version(ifmt)) { 628a765682SGao Xiang case EROFS_INODE_LAYOUT_EXTENDED: 638a765682SGao Xiang vi->inode_isize = sizeof(struct erofs_inode_extended); 640dcd3c94SGao Xiang /* check if the inode acrosses page boundary */ 650dcd3c94SGao Xiang if (*ofs + vi->inode_isize <= PAGE_SIZE) { 660dcd3c94SGao Xiang *ofs += vi->inode_isize; 670dcd3c94SGao Xiang die = (struct erofs_inode_extended *)dic; 680dcd3c94SGao Xiang } else { 690dcd3c94SGao Xiang const unsigned int gotten = PAGE_SIZE - *ofs; 700dcd3c94SGao Xiang 710dcd3c94SGao Xiang copied = kmalloc(vi->inode_isize, GFP_NOFS); 720dcd3c94SGao Xiang if (!copied) { 730dcd3c94SGao Xiang err = -ENOMEM; 740dcd3c94SGao Xiang goto err_out; 750dcd3c94SGao Xiang } 760dcd3c94SGao Xiang memcpy(copied, dic, gotten); 770dcd3c94SGao Xiang unlock_page(page); 780dcd3c94SGao Xiang put_page(page); 790dcd3c94SGao Xiang 800dcd3c94SGao Xiang page = erofs_get_meta_page(sb, blkaddr + 1); 810dcd3c94SGao Xiang if (IS_ERR(page)) { 820dcd3c94SGao Xiang erofs_err(sb, "failed to get inode payload page (nid: %llu), err %ld", 830dcd3c94SGao Xiang vi->nid, PTR_ERR(page)); 840dcd3c94SGao Xiang kfree(copied); 850dcd3c94SGao Xiang return page; 860dcd3c94SGao Xiang } 870dcd3c94SGao Xiang *ofs = vi->inode_isize - gotten; 880dcd3c94SGao Xiang memcpy((u8 *)copied + gotten, page_address(page), *ofs); 890dcd3c94SGao Xiang die = copied; 900dcd3c94SGao Xiang } 918a765682SGao Xiang vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 9247e4937aSGao Xiang 938a765682SGao Xiang inode->i_mode = le16_to_cpu(die->i_mode); 948a765682SGao Xiang switch (inode->i_mode & S_IFMT) { 958a765682SGao Xiang case S_IFREG: 968a765682SGao Xiang case S_IFDIR: 978a765682SGao Xiang case S_IFLNK: 988a765682SGao Xiang vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr); 998a765682SGao Xiang break; 1008a765682SGao Xiang case S_IFCHR: 1018a765682SGao Xiang case S_IFBLK: 10247e4937aSGao Xiang inode->i_rdev = 1038a765682SGao Xiang new_decode_dev(le32_to_cpu(die->i_u.rdev)); 1048a765682SGao Xiang break; 1058a765682SGao Xiang case S_IFIFO: 1068a765682SGao Xiang case S_IFSOCK: 10747e4937aSGao Xiang inode->i_rdev = 0; 1088a765682SGao Xiang break; 1098a765682SGao Xiang default: 11047e4937aSGao Xiang goto bogusimode; 1118a765682SGao Xiang } 1128a765682SGao Xiang i_uid_write(inode, le32_to_cpu(die->i_uid)); 1138a765682SGao Xiang i_gid_write(inode, le32_to_cpu(die->i_gid)); 1148a765682SGao Xiang set_nlink(inode, le32_to_cpu(die->i_nlink)); 11547e4937aSGao Xiang 116d3938ee2SGao Xiang /* extended inode has its own timestamp */ 117d3938ee2SGao Xiang inode->i_ctime.tv_sec = le64_to_cpu(die->i_ctime); 118d3938ee2SGao Xiang inode->i_ctime.tv_nsec = le32_to_cpu(die->i_ctime_nsec); 11947e4937aSGao Xiang 1208a765682SGao Xiang inode->i_size = le64_to_cpu(die->i_size); 12147e4937aSGao Xiang 12247e4937aSGao Xiang /* total blocks for compressed files */ 1238a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) 1248a765682SGao Xiang nblks = le32_to_cpu(die->i_u.compressed_blocks); 1250dcd3c94SGao Xiang 1260dcd3c94SGao Xiang kfree(copied); 1278a765682SGao Xiang break; 1288a765682SGao Xiang case EROFS_INODE_LAYOUT_COMPACT: 1298a765682SGao Xiang vi->inode_isize = sizeof(struct erofs_inode_compact); 1300dcd3c94SGao Xiang *ofs += vi->inode_isize; 1318a765682SGao Xiang vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 13247e4937aSGao Xiang 1338a765682SGao Xiang inode->i_mode = le16_to_cpu(dic->i_mode); 1348a765682SGao Xiang switch (inode->i_mode & S_IFMT) { 1358a765682SGao Xiang case S_IFREG: 1368a765682SGao Xiang case S_IFDIR: 1378a765682SGao Xiang case S_IFLNK: 1388a765682SGao Xiang vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr); 1398a765682SGao Xiang break; 1408a765682SGao Xiang case S_IFCHR: 1418a765682SGao Xiang case S_IFBLK: 14247e4937aSGao Xiang inode->i_rdev = 1438a765682SGao Xiang new_decode_dev(le32_to_cpu(dic->i_u.rdev)); 1448a765682SGao Xiang break; 1458a765682SGao Xiang case S_IFIFO: 1468a765682SGao Xiang case S_IFSOCK: 14747e4937aSGao Xiang inode->i_rdev = 0; 1488a765682SGao Xiang break; 1498a765682SGao Xiang default: 15047e4937aSGao Xiang goto bogusimode; 1518a765682SGao Xiang } 1528a765682SGao Xiang i_uid_write(inode, le16_to_cpu(dic->i_uid)); 1538a765682SGao Xiang i_gid_write(inode, le16_to_cpu(dic->i_gid)); 1548a765682SGao Xiang set_nlink(inode, le16_to_cpu(dic->i_nlink)); 15547e4937aSGao Xiang 156d3938ee2SGao Xiang /* use build time for compact inodes */ 157d3938ee2SGao Xiang inode->i_ctime.tv_sec = sbi->build_time; 158d3938ee2SGao Xiang inode->i_ctime.tv_nsec = sbi->build_time_nsec; 15947e4937aSGao Xiang 1608a765682SGao Xiang inode->i_size = le32_to_cpu(dic->i_size); 1618a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) 1628a765682SGao Xiang nblks = le32_to_cpu(dic->i_u.compressed_blocks); 1638a765682SGao Xiang break; 1648a765682SGao Xiang default: 1654f761fa2SGao Xiang erofs_err(inode->i_sb, 1664f761fa2SGao Xiang "unsupported on-disk inode version %u of nid %llu", 1678a765682SGao Xiang erofs_inode_version(ifmt), vi->nid); 1680dcd3c94SGao Xiang err = -EOPNOTSUPP; 1690dcd3c94SGao Xiang goto err_out; 17047e4937aSGao Xiang } 17147e4937aSGao Xiang 172d3938ee2SGao Xiang inode->i_mtime.tv_sec = inode->i_ctime.tv_sec; 173d3938ee2SGao Xiang inode->i_atime.tv_sec = inode->i_ctime.tv_sec; 174d3938ee2SGao Xiang inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec; 175d3938ee2SGao Xiang inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec; 176d3938ee2SGao Xiang 17747e4937aSGao Xiang if (!nblks) 17847e4937aSGao Xiang /* measure inode.i_blocks as generic filesystems */ 17947e4937aSGao Xiang inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9; 18047e4937aSGao Xiang else 18147e4937aSGao Xiang inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK; 1820dcd3c94SGao Xiang return page; 18347e4937aSGao Xiang 18447e4937aSGao Xiang bogusimode: 1854f761fa2SGao Xiang erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", 1864f761fa2SGao Xiang inode->i_mode, vi->nid); 1870dcd3c94SGao Xiang err = -EFSCORRUPTED; 1880dcd3c94SGao Xiang err_out: 18947e4937aSGao Xiang DBG_BUGON(1); 1900dcd3c94SGao Xiang kfree(copied); 1910dcd3c94SGao Xiang unlock_page(page); 1920dcd3c94SGao Xiang put_page(page); 1930dcd3c94SGao Xiang return ERR_PTR(err); 19447e4937aSGao Xiang } 19547e4937aSGao Xiang 196a2c75c81SGao Xiang static int erofs_fill_symlink(struct inode *inode, void *data, 19747e4937aSGao Xiang unsigned int m_pofs) 19847e4937aSGao Xiang { 199a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 200a2c75c81SGao Xiang char *lnk; 20147e4937aSGao Xiang 202a2c75c81SGao Xiang /* if it cannot be handled with fast symlink scheme */ 203a2c75c81SGao Xiang if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 204a2c75c81SGao Xiang inode->i_size >= PAGE_SIZE) { 205a2c75c81SGao Xiang inode->i_op = &erofs_symlink_iops; 20647e4937aSGao Xiang return 0; 207a2c75c81SGao Xiang } 20847e4937aSGao Xiang 209e2c71e74SGao Xiang lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); 2108d8a09b0SGao Xiang if (!lnk) 21147e4937aSGao Xiang return -ENOMEM; 21247e4937aSGao Xiang 2130dcd3c94SGao Xiang m_pofs += vi->xattr_isize; 2142d78c209SGao Xiang /* inline symlink data shouldn't cross page boundary as well */ 2158d8a09b0SGao Xiang if (m_pofs + inode->i_size > PAGE_SIZE) { 21647e4937aSGao Xiang kfree(lnk); 2174f761fa2SGao Xiang erofs_err(inode->i_sb, 2184f761fa2SGao Xiang "inline data cross block boundary @ nid %llu", 21947e4937aSGao Xiang vi->nid); 22047e4937aSGao Xiang DBG_BUGON(1); 22147e4937aSGao Xiang return -EFSCORRUPTED; 22247e4937aSGao Xiang } 22347e4937aSGao Xiang 22447e4937aSGao Xiang memcpy(lnk, data + m_pofs, inode->i_size); 22547e4937aSGao Xiang lnk[inode->i_size] = '\0'; 22647e4937aSGao Xiang 22747e4937aSGao Xiang inode->i_link = lnk; 228a2c75c81SGao Xiang inode->i_op = &erofs_fast_symlink_iops; 22947e4937aSGao Xiang return 0; 23047e4937aSGao Xiang } 23147e4937aSGao Xiang 23299634bf3SGao Xiang static int erofs_fill_inode(struct inode *inode, int isdir) 23347e4937aSGao Xiang { 234a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 23547e4937aSGao Xiang struct page *page; 23647e4937aSGao Xiang unsigned int ofs; 2370dcd3c94SGao Xiang int err = 0; 23847e4937aSGao Xiang 23947e4937aSGao Xiang trace_erofs_fill_inode(inode, isdir); 24047e4937aSGao Xiang 2410dcd3c94SGao Xiang /* read inode base data from disk */ 2420dcd3c94SGao Xiang page = erofs_read_inode(inode, &ofs); 2430dcd3c94SGao Xiang if (IS_ERR(page)) 24447e4937aSGao Xiang return PTR_ERR(page); 24584947eb6SGao Xiang 24647e4937aSGao Xiang /* setup the new inode */ 247512f9922SPratik Shinde switch (inode->i_mode & S_IFMT) { 248512f9922SPratik Shinde case S_IFREG: 24947e4937aSGao Xiang inode->i_op = &erofs_generic_iops; 250*a08e67a0SHuang Jianan if (erofs_inode_is_data_compressed(vi->datalayout)) 25147e4937aSGao Xiang inode->i_fop = &generic_ro_fops; 252*a08e67a0SHuang Jianan else 253*a08e67a0SHuang Jianan inode->i_fop = &erofs_file_fops; 254512f9922SPratik Shinde break; 255512f9922SPratik Shinde case S_IFDIR: 25647e4937aSGao Xiang inode->i_op = &erofs_dir_iops; 25747e4937aSGao Xiang inode->i_fop = &erofs_dir_fops; 258512f9922SPratik Shinde break; 259512f9922SPratik Shinde case S_IFLNK: 2600dcd3c94SGao Xiang err = erofs_fill_symlink(inode, page_address(page), ofs); 261a2c75c81SGao Xiang if (err) 262a2c75c81SGao Xiang goto out_unlock; 26347e4937aSGao Xiang inode_nohighmem(inode); 264512f9922SPratik Shinde break; 265512f9922SPratik Shinde case S_IFCHR: 266512f9922SPratik Shinde case S_IFBLK: 267512f9922SPratik Shinde case S_IFIFO: 268512f9922SPratik Shinde case S_IFSOCK: 26947e4937aSGao Xiang inode->i_op = &erofs_generic_iops; 27047e4937aSGao Xiang init_special_inode(inode, inode->i_mode, inode->i_rdev); 27147e4937aSGao Xiang goto out_unlock; 272512f9922SPratik Shinde default: 27347e4937aSGao Xiang err = -EFSCORRUPTED; 27447e4937aSGao Xiang goto out_unlock; 27547e4937aSGao Xiang } 27647e4937aSGao Xiang 2778a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) { 27847e4937aSGao Xiang err = z_erofs_fill_inode(inode); 27947e4937aSGao Xiang goto out_unlock; 28047e4937aSGao Xiang } 28147e4937aSGao Xiang inode->i_mapping->a_ops = &erofs_raw_access_aops; 28247e4937aSGao Xiang 28347e4937aSGao Xiang out_unlock: 28447e4937aSGao Xiang unlock_page(page); 28547e4937aSGao Xiang put_page(page); 28647e4937aSGao Xiang return err; 28747e4937aSGao Xiang } 28847e4937aSGao Xiang 28947e4937aSGao Xiang /* 29047e4937aSGao Xiang * erofs nid is 64bits, but i_ino is 'unsigned long', therefore 29147e4937aSGao Xiang * we should do more for 32-bit platform to find the right inode. 29247e4937aSGao Xiang */ 29347e4937aSGao Xiang static int erofs_ilookup_test_actor(struct inode *inode, void *opaque) 29447e4937aSGao Xiang { 29547e4937aSGao Xiang const erofs_nid_t nid = *(erofs_nid_t *)opaque; 29647e4937aSGao Xiang 297a5876e24SGao Xiang return EROFS_I(inode)->nid == nid; 29847e4937aSGao Xiang } 29947e4937aSGao Xiang 30047e4937aSGao Xiang static int erofs_iget_set_actor(struct inode *inode, void *opaque) 30147e4937aSGao Xiang { 30247e4937aSGao Xiang const erofs_nid_t nid = *(erofs_nid_t *)opaque; 30347e4937aSGao Xiang 30447e4937aSGao Xiang inode->i_ino = erofs_inode_hash(nid); 30547e4937aSGao Xiang return 0; 30647e4937aSGao Xiang } 30747e4937aSGao Xiang 30847e4937aSGao Xiang static inline struct inode *erofs_iget_locked(struct super_block *sb, 30947e4937aSGao Xiang erofs_nid_t nid) 31047e4937aSGao Xiang { 31147e4937aSGao Xiang const unsigned long hashval = erofs_inode_hash(nid); 31247e4937aSGao Xiang 31347e4937aSGao Xiang return iget5_locked(sb, hashval, erofs_ilookup_test_actor, 31447e4937aSGao Xiang erofs_iget_set_actor, &nid); 31547e4937aSGao Xiang } 31647e4937aSGao Xiang 31747e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, 31847e4937aSGao Xiang erofs_nid_t nid, 31947e4937aSGao Xiang bool isdir) 32047e4937aSGao Xiang { 32147e4937aSGao Xiang struct inode *inode = erofs_iget_locked(sb, nid); 32247e4937aSGao Xiang 3238d8a09b0SGao Xiang if (!inode) 32447e4937aSGao Xiang return ERR_PTR(-ENOMEM); 32547e4937aSGao Xiang 32647e4937aSGao Xiang if (inode->i_state & I_NEW) { 32747e4937aSGao Xiang int err; 328a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 32947e4937aSGao Xiang 33047e4937aSGao Xiang vi->nid = nid; 33147e4937aSGao Xiang 33299634bf3SGao Xiang err = erofs_fill_inode(inode, isdir); 3338d8a09b0SGao Xiang if (!err) 33447e4937aSGao Xiang unlock_new_inode(inode); 33547e4937aSGao Xiang else { 33647e4937aSGao Xiang iget_failed(inode); 33747e4937aSGao Xiang inode = ERR_PTR(err); 33847e4937aSGao Xiang } 33947e4937aSGao Xiang } 34047e4937aSGao Xiang return inode; 34147e4937aSGao Xiang } 34247e4937aSGao Xiang 343549c7297SChristian Brauner int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 344549c7297SChristian Brauner struct kstat *stat, u32 request_mask, 345549c7297SChristian Brauner unsigned int query_flags) 34647e4937aSGao Xiang { 34747e4937aSGao Xiang struct inode *const inode = d_inode(path->dentry); 34847e4937aSGao Xiang 349a5876e24SGao Xiang if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) 35047e4937aSGao Xiang stat->attributes |= STATX_ATTR_COMPRESSED; 35147e4937aSGao Xiang 35247e4937aSGao Xiang stat->attributes |= STATX_ATTR_IMMUTABLE; 35347e4937aSGao Xiang stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 35447e4937aSGao Xiang STATX_ATTR_IMMUTABLE); 35547e4937aSGao Xiang 3560d56a451SChristian Brauner generic_fillattr(&init_user_ns, inode, stat); 35747e4937aSGao Xiang return 0; 35847e4937aSGao Xiang } 35947e4937aSGao Xiang 36047e4937aSGao Xiang const struct inode_operations erofs_generic_iops = { 36147e4937aSGao Xiang .getattr = erofs_getattr, 36247e4937aSGao Xiang .listxattr = erofs_listxattr, 36347e4937aSGao Xiang .get_acl = erofs_get_acl, 36447e4937aSGao Xiang }; 36547e4937aSGao Xiang 36647e4937aSGao Xiang const struct inode_operations erofs_symlink_iops = { 36747e4937aSGao Xiang .get_link = page_get_link, 36847e4937aSGao Xiang .getattr = erofs_getattr, 36947e4937aSGao Xiang .listxattr = erofs_listxattr, 37047e4937aSGao Xiang .get_acl = erofs_get_acl, 37147e4937aSGao Xiang }; 37247e4937aSGao Xiang 37347e4937aSGao Xiang const struct inode_operations erofs_fast_symlink_iops = { 37447e4937aSGao Xiang .get_link = simple_get_link, 37547e4937aSGao Xiang .getattr = erofs_getattr, 37647e4937aSGao Xiang .listxattr = erofs_listxattr, 37747e4937aSGao Xiang .get_acl = erofs_get_acl, 37847e4937aSGao Xiang }; 379