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 * Created by Gao Xiang <gaoxiang25@huawei.com> 647e4937aSGao Xiang */ 747e4937aSGao Xiang #include "xattr.h" 847e4937aSGao Xiang 947e4937aSGao Xiang #include <trace/events/erofs.h> 1047e4937aSGao Xiang 110dcd3c94SGao Xiang /* 120dcd3c94SGao Xiang * if inode is successfully read, return its inode page (or sometimes 130dcd3c94SGao Xiang * the inode payload page if it's an extended inode) in order to fill 140dcd3c94SGao Xiang * inline data if possible. 150dcd3c94SGao Xiang */ 160dcd3c94SGao Xiang static struct page *erofs_read_inode(struct inode *inode, 170dcd3c94SGao Xiang unsigned int *ofs) 1847e4937aSGao Xiang { 190dcd3c94SGao Xiang struct super_block *sb = inode->i_sb; 200dcd3c94SGao Xiang struct erofs_sb_info *sbi = EROFS_SB(sb); 21a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 220dcd3c94SGao Xiang const erofs_off_t inode_loc = iloc(sbi, vi->nid); 238a765682SGao Xiang 240dcd3c94SGao Xiang erofs_blk_t blkaddr, nblks = 0; 250dcd3c94SGao Xiang struct page *page; 260dcd3c94SGao Xiang struct erofs_inode_compact *dic; 270dcd3c94SGao Xiang struct erofs_inode_extended *die, *copied = NULL; 280dcd3c94SGao Xiang unsigned int ifmt; 290dcd3c94SGao Xiang int err; 300dcd3c94SGao Xiang 310dcd3c94SGao Xiang blkaddr = erofs_blknr(inode_loc); 320dcd3c94SGao Xiang *ofs = erofs_blkoff(inode_loc); 330dcd3c94SGao Xiang 340dcd3c94SGao Xiang erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u", 350dcd3c94SGao Xiang __func__, vi->nid, *ofs, blkaddr); 360dcd3c94SGao Xiang 370dcd3c94SGao Xiang page = erofs_get_meta_page(sb, blkaddr); 380dcd3c94SGao Xiang if (IS_ERR(page)) { 390dcd3c94SGao Xiang erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", 400dcd3c94SGao Xiang vi->nid, PTR_ERR(page)); 410dcd3c94SGao Xiang return page; 420dcd3c94SGao Xiang } 430dcd3c94SGao Xiang 440dcd3c94SGao Xiang dic = page_address(page) + *ofs; 450dcd3c94SGao Xiang ifmt = le16_to_cpu(dic->i_format); 4647e4937aSGao Xiang 478a765682SGao Xiang vi->datalayout = erofs_inode_datalayout(ifmt); 488a765682SGao Xiang if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 494f761fa2SGao Xiang erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu", 508a765682SGao Xiang vi->datalayout, vi->nid); 510dcd3c94SGao Xiang err = -EOPNOTSUPP; 520dcd3c94SGao Xiang goto err_out; 5347e4937aSGao Xiang } 5447e4937aSGao Xiang 558a765682SGao Xiang switch (erofs_inode_version(ifmt)) { 568a765682SGao Xiang case EROFS_INODE_LAYOUT_EXTENDED: 578a765682SGao Xiang vi->inode_isize = sizeof(struct erofs_inode_extended); 580dcd3c94SGao Xiang /* check if the inode acrosses page boundary */ 590dcd3c94SGao Xiang if (*ofs + vi->inode_isize <= PAGE_SIZE) { 600dcd3c94SGao Xiang *ofs += vi->inode_isize; 610dcd3c94SGao Xiang die = (struct erofs_inode_extended *)dic; 620dcd3c94SGao Xiang } else { 630dcd3c94SGao Xiang const unsigned int gotten = PAGE_SIZE - *ofs; 640dcd3c94SGao Xiang 650dcd3c94SGao Xiang copied = kmalloc(vi->inode_isize, GFP_NOFS); 660dcd3c94SGao Xiang if (!copied) { 670dcd3c94SGao Xiang err = -ENOMEM; 680dcd3c94SGao Xiang goto err_out; 690dcd3c94SGao Xiang } 700dcd3c94SGao Xiang memcpy(copied, dic, gotten); 710dcd3c94SGao Xiang unlock_page(page); 720dcd3c94SGao Xiang put_page(page); 730dcd3c94SGao Xiang 740dcd3c94SGao Xiang page = erofs_get_meta_page(sb, blkaddr + 1); 750dcd3c94SGao Xiang if (IS_ERR(page)) { 760dcd3c94SGao Xiang erofs_err(sb, "failed to get inode payload page (nid: %llu), err %ld", 770dcd3c94SGao Xiang vi->nid, PTR_ERR(page)); 780dcd3c94SGao Xiang kfree(copied); 790dcd3c94SGao Xiang return page; 800dcd3c94SGao Xiang } 810dcd3c94SGao Xiang *ofs = vi->inode_isize - gotten; 820dcd3c94SGao Xiang memcpy((u8 *)copied + gotten, page_address(page), *ofs); 830dcd3c94SGao Xiang die = copied; 840dcd3c94SGao Xiang } 858a765682SGao Xiang vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 8647e4937aSGao Xiang 878a765682SGao Xiang inode->i_mode = le16_to_cpu(die->i_mode); 888a765682SGao Xiang switch (inode->i_mode & S_IFMT) { 898a765682SGao Xiang case S_IFREG: 908a765682SGao Xiang case S_IFDIR: 918a765682SGao Xiang case S_IFLNK: 928a765682SGao Xiang vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr); 938a765682SGao Xiang break; 948a765682SGao Xiang case S_IFCHR: 958a765682SGao Xiang case S_IFBLK: 9647e4937aSGao Xiang inode->i_rdev = 978a765682SGao Xiang new_decode_dev(le32_to_cpu(die->i_u.rdev)); 988a765682SGao Xiang break; 998a765682SGao Xiang case S_IFIFO: 1008a765682SGao Xiang case S_IFSOCK: 10147e4937aSGao Xiang inode->i_rdev = 0; 1028a765682SGao Xiang break; 1038a765682SGao Xiang default: 10447e4937aSGao Xiang goto bogusimode; 1058a765682SGao Xiang } 1068a765682SGao Xiang i_uid_write(inode, le32_to_cpu(die->i_uid)); 1078a765682SGao Xiang i_gid_write(inode, le32_to_cpu(die->i_gid)); 1088a765682SGao Xiang set_nlink(inode, le32_to_cpu(die->i_nlink)); 10947e4937aSGao Xiang 110d3938ee2SGao Xiang /* extended inode has its own timestamp */ 111d3938ee2SGao Xiang inode->i_ctime.tv_sec = le64_to_cpu(die->i_ctime); 112d3938ee2SGao Xiang inode->i_ctime.tv_nsec = le32_to_cpu(die->i_ctime_nsec); 11347e4937aSGao Xiang 1148a765682SGao Xiang inode->i_size = le64_to_cpu(die->i_size); 11547e4937aSGao Xiang 11647e4937aSGao Xiang /* total blocks for compressed files */ 1178a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) 1188a765682SGao Xiang nblks = le32_to_cpu(die->i_u.compressed_blocks); 1190dcd3c94SGao Xiang 1200dcd3c94SGao Xiang kfree(copied); 1218a765682SGao Xiang break; 1228a765682SGao Xiang case EROFS_INODE_LAYOUT_COMPACT: 1238a765682SGao Xiang vi->inode_isize = sizeof(struct erofs_inode_compact); 1240dcd3c94SGao Xiang *ofs += vi->inode_isize; 1258a765682SGao Xiang vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 12647e4937aSGao Xiang 1278a765682SGao Xiang inode->i_mode = le16_to_cpu(dic->i_mode); 1288a765682SGao Xiang switch (inode->i_mode & S_IFMT) { 1298a765682SGao Xiang case S_IFREG: 1308a765682SGao Xiang case S_IFDIR: 1318a765682SGao Xiang case S_IFLNK: 1328a765682SGao Xiang vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr); 1338a765682SGao Xiang break; 1348a765682SGao Xiang case S_IFCHR: 1358a765682SGao Xiang case S_IFBLK: 13647e4937aSGao Xiang inode->i_rdev = 1378a765682SGao Xiang new_decode_dev(le32_to_cpu(dic->i_u.rdev)); 1388a765682SGao Xiang break; 1398a765682SGao Xiang case S_IFIFO: 1408a765682SGao Xiang case S_IFSOCK: 14147e4937aSGao Xiang inode->i_rdev = 0; 1428a765682SGao Xiang break; 1438a765682SGao Xiang default: 14447e4937aSGao Xiang goto bogusimode; 1458a765682SGao Xiang } 1468a765682SGao Xiang i_uid_write(inode, le16_to_cpu(dic->i_uid)); 1478a765682SGao Xiang i_gid_write(inode, le16_to_cpu(dic->i_gid)); 1488a765682SGao Xiang set_nlink(inode, le16_to_cpu(dic->i_nlink)); 14947e4937aSGao Xiang 150d3938ee2SGao Xiang /* use build time for compact inodes */ 151d3938ee2SGao Xiang inode->i_ctime.tv_sec = sbi->build_time; 152d3938ee2SGao Xiang inode->i_ctime.tv_nsec = sbi->build_time_nsec; 15347e4937aSGao Xiang 1548a765682SGao Xiang inode->i_size = le32_to_cpu(dic->i_size); 1558a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) 1568a765682SGao Xiang nblks = le32_to_cpu(dic->i_u.compressed_blocks); 1578a765682SGao Xiang break; 1588a765682SGao Xiang default: 1594f761fa2SGao Xiang erofs_err(inode->i_sb, 1604f761fa2SGao Xiang "unsupported on-disk inode version %u of nid %llu", 1618a765682SGao Xiang erofs_inode_version(ifmt), vi->nid); 1620dcd3c94SGao Xiang err = -EOPNOTSUPP; 1630dcd3c94SGao Xiang goto err_out; 16447e4937aSGao Xiang } 16547e4937aSGao Xiang 166d3938ee2SGao Xiang inode->i_mtime.tv_sec = inode->i_ctime.tv_sec; 167d3938ee2SGao Xiang inode->i_atime.tv_sec = inode->i_ctime.tv_sec; 168d3938ee2SGao Xiang inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec; 169d3938ee2SGao Xiang inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec; 170d3938ee2SGao Xiang 17147e4937aSGao Xiang if (!nblks) 17247e4937aSGao Xiang /* measure inode.i_blocks as generic filesystems */ 17347e4937aSGao Xiang inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9; 17447e4937aSGao Xiang else 17547e4937aSGao Xiang inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK; 1760dcd3c94SGao Xiang return page; 17747e4937aSGao Xiang 17847e4937aSGao Xiang bogusimode: 1794f761fa2SGao Xiang erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", 1804f761fa2SGao Xiang inode->i_mode, vi->nid); 1810dcd3c94SGao Xiang err = -EFSCORRUPTED; 1820dcd3c94SGao Xiang err_out: 18347e4937aSGao Xiang DBG_BUGON(1); 1840dcd3c94SGao Xiang kfree(copied); 1850dcd3c94SGao Xiang unlock_page(page); 1860dcd3c94SGao Xiang put_page(page); 1870dcd3c94SGao Xiang return ERR_PTR(err); 18847e4937aSGao Xiang } 18947e4937aSGao Xiang 190a2c75c81SGao Xiang static int erofs_fill_symlink(struct inode *inode, void *data, 19147e4937aSGao Xiang unsigned int m_pofs) 19247e4937aSGao Xiang { 193a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 194a2c75c81SGao Xiang char *lnk; 19547e4937aSGao Xiang 196a2c75c81SGao Xiang /* if it cannot be handled with fast symlink scheme */ 197a2c75c81SGao Xiang if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 198a2c75c81SGao Xiang inode->i_size >= PAGE_SIZE) { 199a2c75c81SGao Xiang inode->i_op = &erofs_symlink_iops; 20047e4937aSGao Xiang return 0; 201a2c75c81SGao Xiang } 20247e4937aSGao Xiang 203e2c71e74SGao Xiang lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); 2048d8a09b0SGao Xiang if (!lnk) 20547e4937aSGao Xiang return -ENOMEM; 20647e4937aSGao Xiang 2070dcd3c94SGao Xiang m_pofs += vi->xattr_isize; 2082d78c209SGao Xiang /* inline symlink data shouldn't cross page boundary as well */ 2098d8a09b0SGao Xiang if (m_pofs + inode->i_size > PAGE_SIZE) { 21047e4937aSGao Xiang kfree(lnk); 2114f761fa2SGao Xiang erofs_err(inode->i_sb, 2124f761fa2SGao Xiang "inline data cross block boundary @ nid %llu", 21347e4937aSGao Xiang vi->nid); 21447e4937aSGao Xiang DBG_BUGON(1); 21547e4937aSGao Xiang return -EFSCORRUPTED; 21647e4937aSGao Xiang } 21747e4937aSGao Xiang 21847e4937aSGao Xiang memcpy(lnk, data + m_pofs, inode->i_size); 21947e4937aSGao Xiang lnk[inode->i_size] = '\0'; 22047e4937aSGao Xiang 22147e4937aSGao Xiang inode->i_link = lnk; 222a2c75c81SGao Xiang inode->i_op = &erofs_fast_symlink_iops; 22347e4937aSGao Xiang return 0; 22447e4937aSGao Xiang } 22547e4937aSGao Xiang 22699634bf3SGao Xiang static int erofs_fill_inode(struct inode *inode, int isdir) 22747e4937aSGao Xiang { 228a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 22947e4937aSGao Xiang struct page *page; 23047e4937aSGao Xiang unsigned int ofs; 2310dcd3c94SGao Xiang int err = 0; 23247e4937aSGao Xiang 23347e4937aSGao Xiang trace_erofs_fill_inode(inode, isdir); 23447e4937aSGao Xiang 2350dcd3c94SGao Xiang /* read inode base data from disk */ 2360dcd3c94SGao Xiang page = erofs_read_inode(inode, &ofs); 2370dcd3c94SGao Xiang if (IS_ERR(page)) 23847e4937aSGao Xiang return PTR_ERR(page); 23984947eb6SGao Xiang 24047e4937aSGao Xiang /* setup the new inode */ 241512f9922SPratik Shinde switch (inode->i_mode & S_IFMT) { 242512f9922SPratik Shinde case S_IFREG: 24347e4937aSGao Xiang inode->i_op = &erofs_generic_iops; 24447e4937aSGao Xiang inode->i_fop = &generic_ro_fops; 245512f9922SPratik Shinde break; 246512f9922SPratik Shinde case S_IFDIR: 24747e4937aSGao Xiang inode->i_op = &erofs_dir_iops; 24847e4937aSGao Xiang inode->i_fop = &erofs_dir_fops; 249512f9922SPratik Shinde break; 250512f9922SPratik Shinde case S_IFLNK: 2510dcd3c94SGao Xiang err = erofs_fill_symlink(inode, page_address(page), ofs); 252a2c75c81SGao Xiang if (err) 253a2c75c81SGao Xiang goto out_unlock; 25447e4937aSGao Xiang inode_nohighmem(inode); 255512f9922SPratik Shinde break; 256512f9922SPratik Shinde case S_IFCHR: 257512f9922SPratik Shinde case S_IFBLK: 258512f9922SPratik Shinde case S_IFIFO: 259512f9922SPratik Shinde case S_IFSOCK: 26047e4937aSGao Xiang inode->i_op = &erofs_generic_iops; 26147e4937aSGao Xiang init_special_inode(inode, inode->i_mode, inode->i_rdev); 26247e4937aSGao Xiang goto out_unlock; 263512f9922SPratik Shinde default: 26447e4937aSGao Xiang err = -EFSCORRUPTED; 26547e4937aSGao Xiang goto out_unlock; 26647e4937aSGao Xiang } 26747e4937aSGao Xiang 2688a765682SGao Xiang if (erofs_inode_is_data_compressed(vi->datalayout)) { 26947e4937aSGao Xiang err = z_erofs_fill_inode(inode); 27047e4937aSGao Xiang goto out_unlock; 27147e4937aSGao Xiang } 27247e4937aSGao Xiang inode->i_mapping->a_ops = &erofs_raw_access_aops; 27347e4937aSGao Xiang 27447e4937aSGao Xiang out_unlock: 27547e4937aSGao Xiang unlock_page(page); 27647e4937aSGao Xiang put_page(page); 27747e4937aSGao Xiang return err; 27847e4937aSGao Xiang } 27947e4937aSGao Xiang 28047e4937aSGao Xiang /* 28147e4937aSGao Xiang * erofs nid is 64bits, but i_ino is 'unsigned long', therefore 28247e4937aSGao Xiang * we should do more for 32-bit platform to find the right inode. 28347e4937aSGao Xiang */ 28447e4937aSGao Xiang static int erofs_ilookup_test_actor(struct inode *inode, void *opaque) 28547e4937aSGao Xiang { 28647e4937aSGao Xiang const erofs_nid_t nid = *(erofs_nid_t *)opaque; 28747e4937aSGao Xiang 288a5876e24SGao Xiang return EROFS_I(inode)->nid == nid; 28947e4937aSGao Xiang } 29047e4937aSGao Xiang 29147e4937aSGao Xiang static int erofs_iget_set_actor(struct inode *inode, void *opaque) 29247e4937aSGao Xiang { 29347e4937aSGao Xiang const erofs_nid_t nid = *(erofs_nid_t *)opaque; 29447e4937aSGao Xiang 29547e4937aSGao Xiang inode->i_ino = erofs_inode_hash(nid); 29647e4937aSGao Xiang return 0; 29747e4937aSGao Xiang } 29847e4937aSGao Xiang 29947e4937aSGao Xiang static inline struct inode *erofs_iget_locked(struct super_block *sb, 30047e4937aSGao Xiang erofs_nid_t nid) 30147e4937aSGao Xiang { 30247e4937aSGao Xiang const unsigned long hashval = erofs_inode_hash(nid); 30347e4937aSGao Xiang 30447e4937aSGao Xiang return iget5_locked(sb, hashval, erofs_ilookup_test_actor, 30547e4937aSGao Xiang erofs_iget_set_actor, &nid); 30647e4937aSGao Xiang } 30747e4937aSGao Xiang 30847e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, 30947e4937aSGao Xiang erofs_nid_t nid, 31047e4937aSGao Xiang bool isdir) 31147e4937aSGao Xiang { 31247e4937aSGao Xiang struct inode *inode = erofs_iget_locked(sb, nid); 31347e4937aSGao Xiang 3148d8a09b0SGao Xiang if (!inode) 31547e4937aSGao Xiang return ERR_PTR(-ENOMEM); 31647e4937aSGao Xiang 31747e4937aSGao Xiang if (inode->i_state & I_NEW) { 31847e4937aSGao Xiang int err; 319a5876e24SGao Xiang struct erofs_inode *vi = EROFS_I(inode); 32047e4937aSGao Xiang 32147e4937aSGao Xiang vi->nid = nid; 32247e4937aSGao Xiang 32399634bf3SGao Xiang err = erofs_fill_inode(inode, isdir); 3248d8a09b0SGao Xiang if (!err) 32547e4937aSGao Xiang unlock_new_inode(inode); 32647e4937aSGao Xiang else { 32747e4937aSGao Xiang iget_failed(inode); 32847e4937aSGao Xiang inode = ERR_PTR(err); 32947e4937aSGao Xiang } 33047e4937aSGao Xiang } 33147e4937aSGao Xiang return inode; 33247e4937aSGao Xiang } 33347e4937aSGao Xiang 33447e4937aSGao Xiang int erofs_getattr(const struct path *path, struct kstat *stat, 33547e4937aSGao Xiang u32 request_mask, unsigned int query_flags) 33647e4937aSGao Xiang { 33747e4937aSGao Xiang struct inode *const inode = d_inode(path->dentry); 33847e4937aSGao Xiang 339a5876e24SGao Xiang if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) 34047e4937aSGao Xiang stat->attributes |= STATX_ATTR_COMPRESSED; 34147e4937aSGao Xiang 34247e4937aSGao Xiang stat->attributes |= STATX_ATTR_IMMUTABLE; 34347e4937aSGao Xiang stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 34447e4937aSGao Xiang STATX_ATTR_IMMUTABLE); 34547e4937aSGao Xiang 346*0d56a451SChristian Brauner generic_fillattr(&init_user_ns, inode, stat); 34747e4937aSGao Xiang return 0; 34847e4937aSGao Xiang } 34947e4937aSGao Xiang 35047e4937aSGao Xiang const struct inode_operations erofs_generic_iops = { 35147e4937aSGao Xiang .getattr = erofs_getattr, 35247e4937aSGao Xiang .listxattr = erofs_listxattr, 35347e4937aSGao Xiang .get_acl = erofs_get_acl, 35447e4937aSGao Xiang }; 35547e4937aSGao Xiang 35647e4937aSGao Xiang const struct inode_operations erofs_symlink_iops = { 35747e4937aSGao Xiang .get_link = page_get_link, 35847e4937aSGao Xiang .getattr = erofs_getattr, 35947e4937aSGao Xiang .listxattr = erofs_listxattr, 36047e4937aSGao Xiang .get_acl = erofs_get_acl, 36147e4937aSGao Xiang }; 36247e4937aSGao Xiang 36347e4937aSGao Xiang const struct inode_operations erofs_fast_symlink_iops = { 36447e4937aSGao Xiang .get_link = simple_get_link, 36547e4937aSGao Xiang .getattr = erofs_getattr, 36647e4937aSGao Xiang .listxattr = erofs_listxattr, 36747e4937aSGao Xiang .get_acl = erofs_get_acl, 36847e4937aSGao Xiang }; 36947e4937aSGao Xiang 370