395 lines
10 KiB
C
395 lines
10 KiB
C
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// 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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* https://www.huawei.com/
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* Copyright (C) 2021, Alibaba Cloud
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*/
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#include "xattr.h"
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#include <trace/events/erofs.h>
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static void *erofs_read_inode(struct erofs_buf *buf,
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struct inode *inode, unsigned int *ofs)
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{
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struct super_block *sb = inode->i_sb;
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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struct erofs_inode *vi = EROFS_I(inode);
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const erofs_off_t inode_loc = erofs_iloc(inode);
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erofs_blk_t blkaddr, nblks = 0;
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void *kaddr;
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struct erofs_inode_compact *dic;
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struct erofs_inode_extended *die, *copied = NULL;
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unsigned int ifmt;
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int err;
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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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kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP);
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if (IS_ERR(kaddr)) {
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erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
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vi->nid, PTR_ERR(kaddr));
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return kaddr;
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}
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dic = kaddr + *ofs;
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ifmt = le16_to_cpu(dic->i_format);
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if (ifmt & ~EROFS_I_ALL) {
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erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu",
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ifmt, vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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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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err = -EOPNOTSUPP;
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goto err_out;
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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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vi->inode_isize = sizeof(struct erofs_inode_extended);
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/* check if the extended inode acrosses block boundary */
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if (*ofs + vi->inode_isize <= EROFS_BLKSIZ) {
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*ofs += vi->inode_isize;
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die = (struct erofs_inode_extended *)dic;
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} else {
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const unsigned int gotten = EROFS_BLKSIZ - *ofs;
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copied = kmalloc(vi->inode_isize, GFP_NOFS);
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if (!copied) {
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err = -ENOMEM;
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goto err_out;
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}
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memcpy(copied, dic, gotten);
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kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1,
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EROFS_KMAP);
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if (IS_ERR(kaddr)) {
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erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
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vi->nid, PTR_ERR(kaddr));
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kfree(copied);
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return kaddr;
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}
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*ofs = vi->inode_isize - gotten;
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memcpy((u8 *)copied + gotten, kaddr, *ofs);
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die = copied;
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}
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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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/* extended inode has its own timestamp */
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inode->i_ctime.tv_sec = le64_to_cpu(die->i_mtime);
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inode->i_ctime.tv_nsec = le32_to_cpu(die->i_mtime_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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else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
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/* fill chunked inode summary info */
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vi->chunkformat = le16_to_cpu(die->i_u.c.format);
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kfree(copied);
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copied = NULL;
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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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*ofs += vi->inode_isize;
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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 for compact inodes */
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inode->i_ctime.tv_sec = sbi->build_time;
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inode->i_ctime.tv_nsec = 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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else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
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vi->chunkformat = le16_to_cpu(dic->i_u.c.format);
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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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err = -EOPNOTSUPP;
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goto err_out;
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}
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if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
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if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
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erofs_err(inode->i_sb,
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"unsupported chunk format %x of nid %llu",
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vi->chunkformat, vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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vi->chunkbits = LOG_BLOCK_SIZE +
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(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
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}
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inode->i_mtime.tv_sec = inode->i_ctime.tv_sec;
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inode->i_atime.tv_sec = inode->i_ctime.tv_sec;
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inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec;
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inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec;
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inode->i_flags &= ~S_DAX;
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if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
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vi->datalayout == EROFS_INODE_FLAT_PLAIN)
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inode->i_flags |= S_DAX;
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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 kaddr;
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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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err = -EFSCORRUPTED;
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err_out:
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DBG_BUGON(1);
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kfree(copied);
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erofs_put_metabuf(buf);
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return ERR_PTR(err);
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}
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static int erofs_fill_symlink(struct inode *inode, void *kaddr,
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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 >= EROFS_BLKSIZ || inode->i_size < 0) {
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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->xattr_isize;
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/* inline symlink data shouldn't cross block boundary */
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if (m_pofs + inode->i_size > EROFS_BLKSIZ) {
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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, kaddr + 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)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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void *kaddr;
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unsigned int ofs;
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int err = 0;
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trace_erofs_fill_inode(inode);
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/* read inode base data from disk */
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kaddr = erofs_read_inode(&buf, inode, &ofs);
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if (IS_ERR(kaddr))
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return PTR_ERR(kaddr);
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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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if (erofs_inode_is_data_compressed(vi->datalayout))
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inode->i_fop = &generic_ro_fops;
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else
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inode->i_fop = &erofs_file_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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inode_nohighmem(inode);
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break;
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case S_IFLNK:
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err = erofs_fill_symlink(inode, kaddr, 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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if (!erofs_is_fscache_mode(inode->i_sb))
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err = z_erofs_fill_inode(inode);
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else
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err = -EOPNOTSUPP;
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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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mapping_set_large_folios(inode->i_mapping);
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#ifdef CONFIG_EROFS_FS_ONDEMAND
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if (erofs_is_fscache_mode(inode->i_sb))
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inode->i_mapping->a_ops = &erofs_fscache_access_aops;
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#endif
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out_unlock:
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erofs_put_metabuf(&buf);
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return err;
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}
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/*
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* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
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* so that it will fit.
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*/
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static ino_t erofs_squash_ino(erofs_nid_t nid)
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{
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ino_t ino = (ino_t)nid;
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if (sizeof(ino_t) < sizeof(erofs_nid_t))
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ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;
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return ino;
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}
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static int erofs_iget5_eq(struct inode *inode, void *opaque)
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{
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return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;
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}
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static int erofs_iget5_set(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_squash_ino(nid);
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EROFS_I(inode)->nid = nid;
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return 0;
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}
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struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)
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{
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struct inode *inode;
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inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,
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|
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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);
|
||
|
|
|
||
|
|
if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
|
||
|
|
stat->attributes |= STATX_ATTR_COMPRESSED;
|
||
|
|
|
||
|
|
stat->attributes |= STATX_ATTR_IMMUTABLE;
|
||
|
|
stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
|
||
|
|
STATX_ATTR_IMMUTABLE);
|
||
|
|
|
||
|
|
generic_fillattr(idmap, 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,
|
||
|
|
};
|