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![Gao Xiang](/assets/img/avatar_default.png)
As Christoph said [1] [2], "Just use the slightly more complicated 32-bit version everywhere so that you have a single actually tested code path. And then remove this helper. " [1] https://lore.kernel.org/r/20190829102426.GE20598@infradead.org/ [2] https://lore.kernel.org/r/20190902125320.GA16726@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-25-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
337 lines
8.1 KiB
C
337 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*/
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#include "xattr.h"
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#include <trace/events/erofs.h>
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/* no locking */
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static int erofs_read_inode(struct inode *inode, void *data)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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struct erofs_inode_compact *dic = data;
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struct erofs_inode_extended *die;
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const unsigned int ifmt = le16_to_cpu(dic->i_format);
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struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
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erofs_blk_t nblks = 0;
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vi->datalayout = erofs_inode_datalayout(ifmt);
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if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
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erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
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vi->datalayout, vi->nid);
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DBG_BUGON(1);
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return -EOPNOTSUPP;
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}
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switch (erofs_inode_version(ifmt)) {
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case EROFS_INODE_LAYOUT_EXTENDED:
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die = data;
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vi->inode_isize = sizeof(struct erofs_inode_extended);
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vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
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inode->i_mode = le16_to_cpu(die->i_mode);
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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case S_IFDIR:
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case S_IFLNK:
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vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
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break;
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case S_IFCHR:
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case S_IFBLK:
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inode->i_rdev =
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new_decode_dev(le32_to_cpu(die->i_u.rdev));
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break;
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case S_IFIFO:
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case S_IFSOCK:
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inode->i_rdev = 0;
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break;
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default:
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goto bogusimode;
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}
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i_uid_write(inode, le32_to_cpu(die->i_uid));
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i_gid_write(inode, le32_to_cpu(die->i_gid));
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set_nlink(inode, le32_to_cpu(die->i_nlink));
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/* ns timestamp */
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inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
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le64_to_cpu(die->i_ctime);
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inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
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le32_to_cpu(die->i_ctime_nsec);
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inode->i_size = le64_to_cpu(die->i_size);
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/* total blocks for compressed files */
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if (erofs_inode_is_data_compressed(vi->datalayout))
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nblks = le32_to_cpu(die->i_u.compressed_blocks);
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break;
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case EROFS_INODE_LAYOUT_COMPACT:
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vi->inode_isize = sizeof(struct erofs_inode_compact);
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vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
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inode->i_mode = le16_to_cpu(dic->i_mode);
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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case S_IFDIR:
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case S_IFLNK:
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vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
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break;
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case S_IFCHR:
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case S_IFBLK:
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inode->i_rdev =
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new_decode_dev(le32_to_cpu(dic->i_u.rdev));
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break;
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case S_IFIFO:
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case S_IFSOCK:
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inode->i_rdev = 0;
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break;
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default:
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goto bogusimode;
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}
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i_uid_write(inode, le16_to_cpu(dic->i_uid));
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i_gid_write(inode, le16_to_cpu(dic->i_gid));
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set_nlink(inode, le16_to_cpu(dic->i_nlink));
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/* use build time to derive all file time */
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inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
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sbi->build_time;
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inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
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sbi->build_time_nsec;
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inode->i_size = le32_to_cpu(dic->i_size);
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if (erofs_inode_is_data_compressed(vi->datalayout))
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nblks = le32_to_cpu(dic->i_u.compressed_blocks);
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break;
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default:
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erofs_err(inode->i_sb,
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"unsupported on-disk inode version %u of nid %llu",
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erofs_inode_version(ifmt), vi->nid);
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DBG_BUGON(1);
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return -EOPNOTSUPP;
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}
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if (!nblks)
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/* measure inode.i_blocks as generic filesystems */
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inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
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else
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inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
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return 0;
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bogusimode:
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erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
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inode->i_mode, vi->nid);
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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static int erofs_fill_symlink(struct inode *inode, void *data,
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unsigned int m_pofs)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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char *lnk;
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/* if it cannot be handled with fast symlink scheme */
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if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
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inode->i_size >= PAGE_SIZE) {
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inode->i_op = &erofs_symlink_iops;
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return 0;
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}
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lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
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if (!lnk)
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return -ENOMEM;
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m_pofs += vi->inode_isize + vi->xattr_isize;
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/* inline symlink data shouldn't cross page boundary as well */
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if (m_pofs + inode->i_size > PAGE_SIZE) {
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kfree(lnk);
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erofs_err(inode->i_sb,
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"inline data cross block boundary @ nid %llu",
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vi->nid);
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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memcpy(lnk, data + m_pofs, inode->i_size);
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lnk[inode->i_size] = '\0';
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inode->i_link = lnk;
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inode->i_op = &erofs_fast_symlink_iops;
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return 0;
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}
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static int erofs_fill_inode(struct inode *inode, int isdir)
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{
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struct super_block *sb = inode->i_sb;
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struct erofs_inode *vi = EROFS_I(inode);
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struct page *page;
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void *data;
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int err;
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erofs_blk_t blkaddr;
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unsigned int ofs;
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erofs_off_t inode_loc;
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trace_erofs_fill_inode(inode, isdir);
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inode_loc = iloc(EROFS_SB(sb), vi->nid);
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blkaddr = erofs_blknr(inode_loc);
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ofs = erofs_blkoff(inode_loc);
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erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u",
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__func__, vi->nid, ofs, blkaddr);
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page = erofs_get_meta_page(sb, blkaddr);
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if (IS_ERR(page)) {
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erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
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vi->nid, PTR_ERR(page));
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return PTR_ERR(page);
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}
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DBG_BUGON(!PageUptodate(page));
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data = page_address(page);
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err = erofs_read_inode(inode, data + ofs);
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if (err)
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goto out_unlock;
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/* setup the new inode */
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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inode->i_op = &erofs_generic_iops;
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inode->i_fop = &generic_ro_fops;
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break;
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case S_IFDIR:
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inode->i_op = &erofs_dir_iops;
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inode->i_fop = &erofs_dir_fops;
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break;
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case S_IFLNK:
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err = erofs_fill_symlink(inode, data, ofs);
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if (err)
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goto out_unlock;
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inode_nohighmem(inode);
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break;
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case S_IFCHR:
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case S_IFBLK:
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case S_IFIFO:
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case S_IFSOCK:
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inode->i_op = &erofs_generic_iops;
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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goto out_unlock;
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default:
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err = -EFSCORRUPTED;
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goto out_unlock;
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}
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if (erofs_inode_is_data_compressed(vi->datalayout)) {
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err = z_erofs_fill_inode(inode);
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goto out_unlock;
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}
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inode->i_mapping->a_ops = &erofs_raw_access_aops;
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out_unlock:
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unlock_page(page);
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put_page(page);
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return err;
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}
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/*
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* erofs nid is 64bits, but i_ino is 'unsigned long', therefore
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* we should do more for 32-bit platform to find the right inode.
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*/
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static int erofs_ilookup_test_actor(struct inode *inode, void *opaque)
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{
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const erofs_nid_t nid = *(erofs_nid_t *)opaque;
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return EROFS_I(inode)->nid == nid;
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}
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static int erofs_iget_set_actor(struct inode *inode, void *opaque)
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{
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const erofs_nid_t nid = *(erofs_nid_t *)opaque;
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inode->i_ino = erofs_inode_hash(nid);
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return 0;
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}
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static inline struct inode *erofs_iget_locked(struct super_block *sb,
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erofs_nid_t nid)
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{
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const unsigned long hashval = erofs_inode_hash(nid);
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return iget5_locked(sb, hashval, erofs_ilookup_test_actor,
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erofs_iget_set_actor, &nid);
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}
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struct inode *erofs_iget(struct super_block *sb,
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erofs_nid_t nid,
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bool isdir)
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{
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struct inode *inode = erofs_iget_locked(sb, nid);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (inode->i_state & I_NEW) {
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int err;
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struct erofs_inode *vi = EROFS_I(inode);
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vi->nid = nid;
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err = erofs_fill_inode(inode, isdir);
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if (!err)
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unlock_new_inode(inode);
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else {
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iget_failed(inode);
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inode = ERR_PTR(err);
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}
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}
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return inode;
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}
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int erofs_getattr(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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struct inode *const inode = d_inode(path->dentry);
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if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
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stat->attributes |= STATX_ATTR_COMPRESSED;
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stat->attributes |= STATX_ATTR_IMMUTABLE;
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stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
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STATX_ATTR_IMMUTABLE);
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generic_fillattr(inode, stat);
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return 0;
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}
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const struct inode_operations erofs_generic_iops = {
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.getattr = erofs_getattr,
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#ifdef CONFIG_EROFS_FS_XATTR
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.listxattr = erofs_listxattr,
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#endif
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.get_acl = erofs_get_acl,
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};
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const struct inode_operations erofs_symlink_iops = {
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.get_link = page_get_link,
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.getattr = erofs_getattr,
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#ifdef CONFIG_EROFS_FS_XATTR
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.listxattr = erofs_listxattr,
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#endif
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.get_acl = erofs_get_acl,
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};
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const struct inode_operations erofs_fast_symlink_iops = {
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.get_link = simple_get_link,
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.getattr = erofs_getattr,
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#ifdef CONFIG_EROFS_FS_XATTR
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.listxattr = erofs_listxattr,
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#endif
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.get_acl = erofs_get_acl,
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};
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