// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2017-2018 HUAWEI, Inc. * https://www.huawei.com/ * Copyright (C) 2021, Alibaba Cloud */ #include "xattr.h" #include static int erofs_fill_symlink(struct inode *inode, void *kaddr, unsigned int m_pofs) { struct erofs_inode *vi = EROFS_I(inode); loff_t off; m_pofs += vi->xattr_isize; /* check if it cannot be handled with fast symlink scheme */ if (vi->datalayout != EROFS_INODE_FLAT_INLINE || check_add_overflow(m_pofs, inode->i_size, &off) || off > i_blocksize(inode)) return 0; inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL); return inode->i_link ? 0 : -ENOMEM; } static int erofs_read_inode(struct inode *inode) { struct super_block *sb = inode->i_sb; struct erofs_sb_info *sbi = EROFS_SB(sb); struct erofs_inode *vi = EROFS_I(inode); const erofs_off_t inode_loc = erofs_iloc(inode); erofs_blk_t blkaddr, nblks = 0; void *kaddr; struct erofs_inode_compact *dic; struct erofs_inode_extended *die, *copied = NULL; union erofs_inode_i_u iu; struct erofs_buf buf = __EROFS_BUF_INITIALIZER; unsigned int ifmt, ofs; int err = 0; blkaddr = erofs_blknr(sb, inode_loc); ofs = erofs_blkoff(sb, inode_loc); kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), EROFS_KMAP); if (IS_ERR(kaddr)) { erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", vi->nid, PTR_ERR(kaddr)); return PTR_ERR(kaddr); } dic = kaddr + ofs; ifmt = le16_to_cpu(dic->i_format); if (ifmt & ~EROFS_I_ALL) { erofs_err(sb, "unsupported i_format %u of nid %llu", ifmt, vi->nid); err = -EOPNOTSUPP; goto err_out; } vi->datalayout = erofs_inode_datalayout(ifmt); if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { erofs_err(sb, "unsupported datalayout %u of nid %llu", vi->datalayout, vi->nid); err = -EOPNOTSUPP; goto err_out; } switch (erofs_inode_version(ifmt)) { case EROFS_INODE_LAYOUT_EXTENDED: vi->inode_isize = sizeof(struct erofs_inode_extended); /* check if the extended inode acrosses block boundary */ if (ofs + vi->inode_isize <= sb->s_blocksize) { ofs += vi->inode_isize; die = (struct erofs_inode_extended *)dic; } else { const unsigned int gotten = sb->s_blocksize - ofs; copied = kmalloc(vi->inode_isize, GFP_KERNEL); if (!copied) { err = -ENOMEM; goto err_out; } memcpy(copied, dic, gotten); kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr + 1), EROFS_KMAP); if (IS_ERR(kaddr)) { erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld", vi->nid, PTR_ERR(kaddr)); kfree(copied); return PTR_ERR(kaddr); } ofs = vi->inode_isize - gotten; memcpy((u8 *)copied + gotten, kaddr, ofs); die = copied; } vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); inode->i_mode = le16_to_cpu(die->i_mode); iu = die->i_u; i_uid_write(inode, le32_to_cpu(die->i_uid)); i_gid_write(inode, le32_to_cpu(die->i_gid)); set_nlink(inode, le32_to_cpu(die->i_nlink)); /* each extended inode has its own timestamp */ inode_set_ctime(inode, le64_to_cpu(die->i_mtime), le32_to_cpu(die->i_mtime_nsec)); inode->i_size = le64_to_cpu(die->i_size); kfree(copied); break; case EROFS_INODE_LAYOUT_COMPACT: vi->inode_isize = sizeof(struct erofs_inode_compact); ofs += vi->inode_isize; vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); inode->i_mode = le16_to_cpu(dic->i_mode); iu = dic->i_u; i_uid_write(inode, le16_to_cpu(dic->i_uid)); i_gid_write(inode, le16_to_cpu(dic->i_gid)); set_nlink(inode, le16_to_cpu(dic->i_nlink)); /* use build time for compact inodes */ inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec); inode->i_size = le32_to_cpu(dic->i_size); break; default: erofs_err(sb, "unsupported on-disk inode version %u of nid %llu", erofs_inode_version(ifmt), vi->nid); err = -EOPNOTSUPP; goto err_out; } if (unlikely(inode->i_size < 0)) { erofs_err(sb, "negative i_size @ nid %llu", vi->nid); err = -EFSCORRUPTED; goto err_out; } switch (inode->i_mode & S_IFMT) { case S_IFREG: case S_IFDIR: case S_IFLNK: vi->raw_blkaddr = le32_to_cpu(iu.raw_blkaddr); if(S_ISLNK(inode->i_mode)) { err = erofs_fill_symlink(inode, kaddr, ofs); if (err) goto err_out; } break; case S_IFCHR: case S_IFBLK: inode->i_rdev = new_decode_dev(le32_to_cpu(iu.rdev)); break; case S_IFIFO: case S_IFSOCK: inode->i_rdev = 0; break; default: erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode, vi->nid); err = -EFSCORRUPTED; goto err_out; } /* total blocks for compressed files */ if (erofs_inode_is_data_compressed(vi->datalayout)) { nblks = le32_to_cpu(iu.compressed_blocks); } else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { /* fill chunked inode summary info */ vi->chunkformat = le16_to_cpu(iu.c.format); if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { erofs_err(sb, "unsupported chunk format %x of nid %llu", vi->chunkformat, vi->nid); err = -EOPNOTSUPP; goto err_out; } vi->chunkbits = sb->s_blocksize_bits + (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); } inode_set_mtime_to_ts(inode, inode_set_atime_to_ts(inode, inode_get_ctime(inode))); inode->i_flags &= ~S_DAX; if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && (vi->datalayout == EROFS_INODE_FLAT_PLAIN || vi->datalayout == EROFS_INODE_CHUNK_BASED)) inode->i_flags |= S_DAX; if (!nblks) /* measure inode.i_blocks as generic filesystems */ inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; else inode->i_blocks = nblks << (sb->s_blocksize_bits - 9); err_out: DBG_BUGON(err); erofs_put_metabuf(&buf); return err; } static int erofs_fill_inode(struct inode *inode) { struct erofs_inode *vi = EROFS_I(inode); int err; trace_erofs_fill_inode(inode); /* read inode base data from disk */ err = erofs_read_inode(inode); if (err) return err; /* setup the new inode */ switch (inode->i_mode & S_IFMT) { case S_IFREG: inode->i_op = &erofs_generic_iops; if (erofs_inode_is_data_compressed(vi->datalayout)) inode->i_fop = &generic_ro_fops; else inode->i_fop = &erofs_file_fops; break; case S_IFDIR: inode->i_op = &erofs_dir_iops; inode->i_fop = &erofs_dir_fops; inode_nohighmem(inode); break; case S_IFLNK: if (inode->i_link) inode->i_op = &erofs_fast_symlink_iops; else inode->i_op = &erofs_symlink_iops; inode_nohighmem(inode); break; case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: inode->i_op = &erofs_generic_iops; init_special_inode(inode, inode->i_mode, inode->i_rdev); return 0; default: return -EFSCORRUPTED; } mapping_set_large_folios(inode->i_mapping); if (erofs_inode_is_data_compressed(vi->datalayout)) { #ifdef CONFIG_EROFS_FS_ZIP DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT, erofs_info, inode->i_sb, "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!"); inode->i_mapping->a_ops = &z_erofs_aops; #else err = -EOPNOTSUPP; #endif } else { inode->i_mapping->a_ops = &erofs_aops; #ifdef CONFIG_EROFS_FS_ONDEMAND if (erofs_is_fscache_mode(inode->i_sb)) inode->i_mapping->a_ops = &erofs_fscache_access_aops; #endif #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb))) inode->i_mapping->a_ops = &erofs_fileio_aops; #endif } return err; } /* * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down * so that it will fit. */ static ino_t erofs_squash_ino(erofs_nid_t nid) { ino_t ino = (ino_t)nid; if (sizeof(ino_t) < sizeof(erofs_nid_t)) ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; return ino; } static int erofs_iget5_eq(struct inode *inode, void *opaque) { return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; } static int erofs_iget5_set(struct inode *inode, void *opaque) { const erofs_nid_t nid = *(erofs_nid_t *)opaque; inode->i_ino = erofs_squash_ino(nid); EROFS_I(inode)->nid = nid; return 0; } struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) { struct inode *inode; inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq, erofs_iget5_set, &nid); if (!inode) return ERR_PTR(-ENOMEM); if (inode->i_state & I_NEW) { int err = erofs_fill_inode(inode); if (err) { iget_failed(inode); return ERR_PTR(err); } unlock_new_inode(inode); } return inode; } int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) { struct inode *const inode = d_inode(path->dentry); bool compressed = erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout); if (compressed) stat->attributes |= STATX_ATTR_COMPRESSED; stat->attributes |= STATX_ATTR_IMMUTABLE; stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_IMMUTABLE); /* * Return the DIO alignment restrictions if requested. * * In EROFS, STATX_DIOALIGN is not supported in ondemand mode and * compressed files, so in these cases we report no DIO support. */ if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) { stat->result_mask |= STATX_DIOALIGN; if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) { stat->dio_mem_align = bdev_logical_block_size(inode->i_sb->s_bdev); stat->dio_offset_align = stat->dio_mem_align; } } generic_fillattr(idmap, request_mask, inode, stat); return 0; } const struct inode_operations erofs_generic_iops = { .getattr = erofs_getattr, .listxattr = erofs_listxattr, .get_inode_acl = erofs_get_acl, .fiemap = erofs_fiemap, }; const struct inode_operations erofs_symlink_iops = { .get_link = page_get_link, .getattr = erofs_getattr, .listxattr = erofs_listxattr, .get_inode_acl = erofs_get_acl, }; const struct inode_operations erofs_fast_symlink_iops = { .get_link = simple_get_link, .getattr = erofs_getattr, .listxattr = erofs_listxattr, .get_inode_acl = erofs_get_acl, };