diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 3350ab65d892..b36b414cd7a7 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -8,31 +8,80 @@ #include -/* no locking */ -static int erofs_read_inode(struct inode *inode, void *data) +/* + * if inode is successfully read, return its inode page (or sometimes + * the inode payload page if it's an extended inode) in order to fill + * inline data if possible. + */ +static struct page *erofs_read_inode(struct inode *inode, + unsigned int *ofs) { + struct super_block *sb = inode->i_sb; + struct erofs_sb_info *sbi = EROFS_SB(sb); struct erofs_inode *vi = EROFS_I(inode); - struct erofs_inode_compact *dic = data; - struct erofs_inode_extended *die; + const erofs_off_t inode_loc = iloc(sbi, vi->nid); - const unsigned int ifmt = le16_to_cpu(dic->i_format); - struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb); - erofs_blk_t nblks = 0; + erofs_blk_t blkaddr, nblks = 0; + struct page *page; + struct erofs_inode_compact *dic; + struct erofs_inode_extended *die, *copied = NULL; + unsigned int ifmt; + int err; + + blkaddr = erofs_blknr(inode_loc); + *ofs = erofs_blkoff(inode_loc); + + erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u", + __func__, vi->nid, *ofs, blkaddr); + + page = erofs_get_meta_page(sb, blkaddr); + if (IS_ERR(page)) { + erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", + vi->nid, PTR_ERR(page)); + return page; + } + + dic = page_address(page) + *ofs; + ifmt = le16_to_cpu(dic->i_format); vi->datalayout = erofs_inode_datalayout(ifmt); - if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu", vi->datalayout, vi->nid); - DBG_BUGON(1); - return -EOPNOTSUPP; + err = -EOPNOTSUPP; + goto err_out; } switch (erofs_inode_version(ifmt)) { case EROFS_INODE_LAYOUT_EXTENDED: - die = data; - vi->inode_isize = sizeof(struct erofs_inode_extended); + /* check if the inode acrosses page boundary */ + if (*ofs + vi->inode_isize <= PAGE_SIZE) { + *ofs += vi->inode_isize; + die = (struct erofs_inode_extended *)dic; + } else { + const unsigned int gotten = PAGE_SIZE - *ofs; + + copied = kmalloc(vi->inode_isize, GFP_NOFS); + if (!copied) { + err = -ENOMEM; + goto err_out; + } + memcpy(copied, dic, gotten); + unlock_page(page); + put_page(page); + + page = erofs_get_meta_page(sb, blkaddr + 1); + if (IS_ERR(page)) { + erofs_err(sb, "failed to get inode payload page (nid: %llu), err %ld", + vi->nid, PTR_ERR(page)); + kfree(copied); + return page; + } + *ofs = vi->inode_isize - gotten; + memcpy((u8 *)copied + gotten, page_address(page), *ofs); + die = copied; + } vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); inode->i_mode = le16_to_cpu(die->i_mode); @@ -69,9 +118,12 @@ static int erofs_read_inode(struct inode *inode, void *data) /* total blocks for compressed files */ if (erofs_inode_is_data_compressed(vi->datalayout)) nblks = le32_to_cpu(die->i_u.compressed_blocks); + + 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); @@ -111,8 +163,8 @@ static int erofs_read_inode(struct inode *inode, void *data) erofs_err(inode->i_sb, "unsupported on-disk inode version %u of nid %llu", erofs_inode_version(ifmt), vi->nid); - DBG_BUGON(1); - return -EOPNOTSUPP; + err = -EOPNOTSUPP; + goto err_out; } if (!nblks) @@ -120,13 +172,18 @@ static int erofs_read_inode(struct inode *inode, void *data) inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9; else inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK; - return 0; + return page; bogusimode: erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode, vi->nid); + err = -EFSCORRUPTED; +err_out: DBG_BUGON(1); - return -EFSCORRUPTED; + kfree(copied); + unlock_page(page); + put_page(page); + return ERR_PTR(err); } static int erofs_fill_symlink(struct inode *inode, void *data, @@ -146,7 +203,7 @@ static int erofs_fill_symlink(struct inode *inode, void *data, if (!lnk) return -ENOMEM; - m_pofs += vi->inode_isize + vi->xattr_isize; + m_pofs += vi->xattr_isize; /* inline symlink data shouldn't cross page boundary as well */ if (m_pofs + inode->i_size > PAGE_SIZE) { kfree(lnk); @@ -167,37 +224,17 @@ static int erofs_fill_symlink(struct inode *inode, void *data, static int erofs_fill_inode(struct inode *inode, int isdir) { - struct super_block *sb = inode->i_sb; struct erofs_inode *vi = EROFS_I(inode); struct page *page; - void *data; - int err; - erofs_blk_t blkaddr; unsigned int ofs; - erofs_off_t inode_loc; + int err = 0; trace_erofs_fill_inode(inode, isdir); - inode_loc = iloc(EROFS_SB(sb), vi->nid); - blkaddr = erofs_blknr(inode_loc); - ofs = erofs_blkoff(inode_loc); - erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u", - __func__, vi->nid, ofs, blkaddr); - - page = erofs_get_meta_page(sb, blkaddr); - - if (IS_ERR(page)) { - erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", - vi->nid, PTR_ERR(page)); + /* read inode base data from disk */ + page = erofs_read_inode(inode, &ofs); + if (IS_ERR(page)) return PTR_ERR(page); - } - - DBG_BUGON(!PageUptodate(page)); - data = page_address(page); - - err = erofs_read_inode(inode, data + ofs); - if (err) - goto out_unlock; /* setup the new inode */ switch (inode->i_mode & S_IFMT) { @@ -210,7 +247,7 @@ static int erofs_fill_inode(struct inode *inode, int isdir) inode->i_fop = &erofs_dir_fops; break; case S_IFLNK: - err = erofs_fill_symlink(inode, data, ofs); + err = erofs_fill_symlink(inode, page_address(page), ofs); if (err) goto out_unlock; inode_nohighmem(inode);