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https://github.com/sheumann/hush.git
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961 lines
26 KiB
C
961 lines
26 KiB
C
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/*
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* journal.c --- code for handling the "ext3" journal
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*
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* Copyright (C) 2000 Andreas Dilger
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* Copyright (C) 2000 Theodore Ts'o
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*
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* Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
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* Copyright (C) 1999 Red Hat Software
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*
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* This file may be redistributed under the terms of the
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* GNU General Public License version 2 or at your discretion
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* any later version.
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*/
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#ifdef HAVE_SYS_MOUNT_H
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#include <sys/param.h>
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#include <sys/mount.h>
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#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#define E2FSCK_INCLUDE_INLINE_FUNCS
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#include "jfs_user.h"
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#include "problem.h"
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#include "uuid/uuid.h"
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#ifdef __CONFIG_JBD_DEBUG__E2FS /* Enabled by configure --enable-jfs-debug */
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static int bh_count = 0;
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#endif
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/*
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* Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
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* This creates a larger static binary, and a smaller binary using
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* shared libraries. It's also probably slightly less CPU-efficient,
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* which is why it's not on by default. But, it's a good way of
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* testing the functions in inode_io.c and fileio.c.
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*/
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#undef USE_INODE_IO
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/* Kernel compatibility functions for handling the journal. These allow us
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* to use the recovery.c file virtually unchanged from the kernel, so we
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* don't have to do much to keep kernel and user recovery in sync.
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*/
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int journal_bmap(journal_t *journal, blk_t block, unsigned long *phys)
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{
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#ifdef USE_INODE_IO
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*phys = block;
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return 0;
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#else
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struct inode *inode = journal->j_inode;
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errcode_t retval;
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blk_t pblk;
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if (!inode) {
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*phys = block;
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return 0;
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}
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retval= ext2fs_bmap(inode->i_ctx->fs, inode->i_ino,
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&inode->i_ext2, NULL, 0, block, &pblk);
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*phys = pblk;
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return (retval);
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#endif
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}
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struct buffer_head *getblk(kdev_t kdev, blk_t blocknr, int blocksize)
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{
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struct buffer_head *bh;
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bh = e2fsck_allocate_memory(kdev->k_ctx, sizeof(*bh), "block buffer");
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if (!bh)
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return NULL;
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jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
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(unsigned long) blocknr, blocksize, ++bh_count);
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bh->b_ctx = kdev->k_ctx;
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if (kdev->k_dev == K_DEV_FS)
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bh->b_io = kdev->k_ctx->fs->io;
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else
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bh->b_io = kdev->k_ctx->journal_io;
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bh->b_size = blocksize;
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bh->b_blocknr = blocknr;
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return bh;
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}
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void sync_blockdev(kdev_t kdev)
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{
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io_channel io;
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if (kdev->k_dev == K_DEV_FS)
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io = kdev->k_ctx->fs->io;
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else
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io = kdev->k_ctx->journal_io;
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io_channel_flush(io);
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}
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void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
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{
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int retval;
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struct buffer_head *bh;
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for (; nr > 0; --nr) {
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bh = *bhp++;
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if (rw == READ && !bh->b_uptodate) {
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jfs_debug(3, "reading block %lu/%p\n",
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(unsigned long) bh->b_blocknr, (void *) bh);
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retval = io_channel_read_blk(bh->b_io,
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bh->b_blocknr,
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1, bh->b_data);
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if (retval) {
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com_err(bh->b_ctx->device_name, retval,
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"while reading block %lu\n",
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(unsigned long) bh->b_blocknr);
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bh->b_err = retval;
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continue;
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}
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bh->b_uptodate = 1;
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} else if (rw == WRITE && bh->b_dirty) {
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jfs_debug(3, "writing block %lu/%p\n",
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(unsigned long) bh->b_blocknr, (void *) bh);
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retval = io_channel_write_blk(bh->b_io,
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bh->b_blocknr,
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1, bh->b_data);
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if (retval) {
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com_err(bh->b_ctx->device_name, retval,
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"while writing block %lu\n",
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(unsigned long) bh->b_blocknr);
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bh->b_err = retval;
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continue;
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}
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bh->b_dirty = 0;
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bh->b_uptodate = 1;
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} else {
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jfs_debug(3, "no-op %s for block %lu\n",
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rw == READ ? "read" : "write",
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(unsigned long) bh->b_blocknr);
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}
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}
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}
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void mark_buffer_dirty(struct buffer_head *bh)
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{
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bh->b_dirty = 1;
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}
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static void mark_buffer_clean(struct buffer_head * bh)
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{
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bh->b_dirty = 0;
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}
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void brelse(struct buffer_head *bh)
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{
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if (bh->b_dirty)
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ll_rw_block(WRITE, 1, &bh);
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jfs_debug(3, "freeing block %lu/%p (total %d)\n",
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(unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
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ext2fs_free_mem(&bh);
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}
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int buffer_uptodate(struct buffer_head *bh)
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{
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return bh->b_uptodate;
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}
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void mark_buffer_uptodate(struct buffer_head *bh, int val)
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{
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bh->b_uptodate = val;
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}
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void wait_on_buffer(struct buffer_head *bh)
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{
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if (!bh->b_uptodate)
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ll_rw_block(READ, 1, &bh);
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}
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static void e2fsck_clear_recover(e2fsck_t ctx, int error)
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{
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ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
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/* if we had an error doing journal recovery, we need a full fsck */
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if (error)
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ctx->fs->super->s_state &= ~EXT2_VALID_FS;
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ext2fs_mark_super_dirty(ctx->fs);
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}
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static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
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{
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struct ext2_super_block *sb = ctx->fs->super;
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struct ext2_super_block jsuper;
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struct problem_context pctx;
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struct buffer_head *bh;
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struct inode *j_inode = NULL;
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struct kdev_s *dev_fs = NULL, *dev_journal;
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const char *journal_name = 0;
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journal_t *journal = NULL;
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errcode_t retval = 0;
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io_manager io_ptr = 0;
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unsigned long start = 0;
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blk_t blk;
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int ext_journal = 0;
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int tried_backup_jnl = 0;
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int i;
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clear_problem_context(&pctx);
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journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
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if (!journal) {
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return EXT2_ET_NO_MEMORY;
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}
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dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
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if (!dev_fs) {
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retval = EXT2_ET_NO_MEMORY;
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goto errout;
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}
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dev_journal = dev_fs+1;
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dev_fs->k_ctx = dev_journal->k_ctx = ctx;
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dev_fs->k_dev = K_DEV_FS;
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dev_journal->k_dev = K_DEV_JOURNAL;
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journal->j_dev = dev_journal;
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journal->j_fs_dev = dev_fs;
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journal->j_inode = NULL;
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journal->j_blocksize = ctx->fs->blocksize;
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if (uuid_is_null(sb->s_journal_uuid)) {
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if (!sb->s_journal_inum)
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return EXT2_ET_BAD_INODE_NUM;
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j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
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"journal inode");
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if (!j_inode) {
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retval = EXT2_ET_NO_MEMORY;
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goto errout;
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}
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j_inode->i_ctx = ctx;
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j_inode->i_ino = sb->s_journal_inum;
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if ((retval = ext2fs_read_inode(ctx->fs,
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sb->s_journal_inum,
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&j_inode->i_ext2))) {
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try_backup_journal:
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if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
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tried_backup_jnl)
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goto errout;
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memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
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memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
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EXT2_N_BLOCKS*4);
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j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
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j_inode->i_ext2.i_links_count = 1;
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j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
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tried_backup_jnl++;
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}
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if (!j_inode->i_ext2.i_links_count ||
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!LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
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retval = EXT2_ET_NO_JOURNAL;
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goto try_backup_journal;
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}
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if (j_inode->i_ext2.i_size / journal->j_blocksize <
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JFS_MIN_JOURNAL_BLOCKS) {
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retval = EXT2_ET_JOURNAL_TOO_SMALL;
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goto try_backup_journal;
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}
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for (i=0; i < EXT2_N_BLOCKS; i++) {
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blk = j_inode->i_ext2.i_block[i];
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if (!blk) {
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if (i < EXT2_NDIR_BLOCKS) {
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retval = EXT2_ET_JOURNAL_TOO_SMALL;
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goto try_backup_journal;
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|
}
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continue;
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}
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||
|
if (blk < sb->s_first_data_block ||
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blk >= sb->s_blocks_count) {
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retval = EXT2_ET_BAD_BLOCK_NUM;
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|
goto try_backup_journal;
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|
}
|
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|
}
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journal->j_maxlen = j_inode->i_ext2.i_size / journal->j_blocksize;
|
||
|
|
||
|
#ifdef USE_INODE_IO
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|
retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
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&j_inode->i_ext2,
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|
&journal_name);
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|
if (retval)
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||
|
goto errout;
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||
|
|
||
|
io_ptr = inode_io_manager;
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|
#else
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|
journal->j_inode = j_inode;
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|
ctx->journal_io = ctx->fs->io;
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|
if ((retval = journal_bmap(journal, 0, &start)) != 0)
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|
goto errout;
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||
|
#endif
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|
} else {
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|
ext_journal = 1;
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|
if (!ctx->journal_name) {
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|
char uuid[37];
|
||
|
|
||
|
uuid_unparse(sb->s_journal_uuid, uuid);
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|
ctx->journal_name = blkid_get_devname(ctx->blkid,
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|
"UUID", uuid);
|
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|
if (!ctx->journal_name)
|
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|
ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
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|
}
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|
journal_name = ctx->journal_name;
|
||
|
|
||
|
if (!journal_name) {
|
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|
fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
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|
return EXT2_ET_LOAD_EXT_JOURNAL;
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|
}
|
||
|
|
||
|
jfs_debug(1, "Using journal file %s\n", journal_name);
|
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|
io_ptr = unix_io_manager;
|
||
|
}
|
||
|
|
||
|
#if 0
|
||
|
test_io_backing_manager = io_ptr;
|
||
|
io_ptr = test_io_manager;
|
||
|
#endif
|
||
|
#ifndef USE_INODE_IO
|
||
|
if (ext_journal)
|
||
|
#endif
|
||
|
retval = io_ptr->open(journal_name, IO_FLAG_RW,
|
||
|
&ctx->journal_io);
|
||
|
if (retval)
|
||
|
goto errout;
|
||
|
|
||
|
io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
|
||
|
|
||
|
if (ext_journal) {
|
||
|
if (ctx->fs->blocksize == 1024)
|
||
|
start = 1;
|
||
|
bh = getblk(dev_journal, start, ctx->fs->blocksize);
|
||
|
if (!bh) {
|
||
|
retval = EXT2_ET_NO_MEMORY;
|
||
|
goto errout;
|
||
|
}
|
||
|
ll_rw_block(READ, 1, &bh);
|
||
|
if ((retval = bh->b_err) != 0)
|
||
|
goto errout;
|
||
|
memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024,
|
||
|
sizeof(jsuper));
|
||
|
brelse(bh);
|
||
|
#ifdef EXT2FS_ENABLE_SWAPFS
|
||
|
if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
|
||
|
ext2fs_swap_super(&jsuper);
|
||
|
#endif
|
||
|
if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
|
||
|
!(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
|
||
|
fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
|
||
|
retval = EXT2_ET_LOAD_EXT_JOURNAL;
|
||
|
goto errout;
|
||
|
}
|
||
|
/* Make sure the journal UUID is correct */
|
||
|
if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
|
||
|
sizeof(jsuper.s_uuid))) {
|
||
|
fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
|
||
|
retval = EXT2_ET_LOAD_EXT_JOURNAL;
|
||
|
goto errout;
|
||
|
}
|
||
|
|
||
|
journal->j_maxlen = jsuper.s_blocks_count;
|
||
|
start++;
|
||
|
}
|
||
|
|
||
|
if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
|
||
|
retval = EXT2_ET_NO_MEMORY;
|
||
|
goto errout;
|
||
|
}
|
||
|
|
||
|
journal->j_sb_buffer = bh;
|
||
|
journal->j_superblock = (journal_superblock_t *)bh->b_data;
|
||
|
|
||
|
#ifdef USE_INODE_IO
|
||
|
if (j_inode)
|
||
|
ext2fs_free_mem(&j_inode);
|
||
|
#endif
|
||
|
|
||
|
*ret_journal = journal;
|
||
|
return 0;
|
||
|
|
||
|
errout:
|
||
|
if (dev_fs)
|
||
|
ext2fs_free_mem(&dev_fs);
|
||
|
if (j_inode)
|
||
|
ext2fs_free_mem(&j_inode);
|
||
|
if (journal)
|
||
|
ext2fs_free_mem(&journal);
|
||
|
return retval;
|
||
|
|
||
|
}
|
||
|
|
||
|
static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
|
||
|
struct problem_context *pctx)
|
||
|
{
|
||
|
struct ext2_super_block *sb = ctx->fs->super;
|
||
|
int recover = ctx->fs->super->s_feature_incompat &
|
||
|
EXT3_FEATURE_INCOMPAT_RECOVER;
|
||
|
int has_journal = ctx->fs->super->s_feature_compat &
|
||
|
EXT3_FEATURE_COMPAT_HAS_JOURNAL;
|
||
|
|
||
|
if (has_journal || sb->s_journal_inum) {
|
||
|
/* The journal inode is bogus, remove and force full fsck */
|
||
|
pctx->ino = sb->s_journal_inum;
|
||
|
if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
|
||
|
if (has_journal && sb->s_journal_inum)
|
||
|
printf("*** ext3 journal has been deleted - "
|
||
|
"filesystem is now ext2 only ***\n\n");
|
||
|
sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
|
||
|
sb->s_journal_inum = 0;
|
||
|
ctx->flags |= E2F_FLAG_JOURNAL_INODE; /* FIXME: todo */
|
||
|
e2fsck_clear_recover(ctx, 1);
|
||
|
return 0;
|
||
|
}
|
||
|
return EXT2_ET_BAD_INODE_NUM;
|
||
|
} else if (recover) {
|
||
|
if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
|
||
|
e2fsck_clear_recover(ctx, 1);
|
||
|
return 0;
|
||
|
}
|
||
|
return EXT2_ET_UNSUPP_FEATURE;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#define V1_SB_SIZE 0x0024
|
||
|
static void clear_v2_journal_fields(journal_t *journal)
|
||
|
{
|
||
|
e2fsck_t ctx = journal->j_dev->k_ctx;
|
||
|
struct problem_context pctx;
|
||
|
|
||
|
clear_problem_context(&pctx);
|
||
|
|
||
|
if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
|
||
|
return;
|
||
|
|
||
|
memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
|
||
|
ctx->fs->blocksize-V1_SB_SIZE);
|
||
|
mark_buffer_dirty(journal->j_sb_buffer);
|
||
|
}
|
||
|
|
||
|
|
||
|
static errcode_t e2fsck_journal_load(journal_t *journal)
|
||
|
{
|
||
|
e2fsck_t ctx = journal->j_dev->k_ctx;
|
||
|
journal_superblock_t *jsb;
|
||
|
struct buffer_head *jbh = journal->j_sb_buffer;
|
||
|
struct problem_context pctx;
|
||
|
|
||
|
clear_problem_context(&pctx);
|
||
|
|
||
|
ll_rw_block(READ, 1, &jbh);
|
||
|
if (jbh->b_err) {
|
||
|
com_err(ctx->device_name, jbh->b_err,
|
||
|
_("reading journal superblock\n"));
|
||
|
return jbh->b_err;
|
||
|
}
|
||
|
|
||
|
jsb = journal->j_superblock;
|
||
|
/* If we don't even have JFS_MAGIC, we probably have a wrong inode */
|
||
|
if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
|
||
|
return e2fsck_journal_fix_bad_inode(ctx, &pctx);
|
||
|
|
||
|
switch (ntohl(jsb->s_header.h_blocktype)) {
|
||
|
case JFS_SUPERBLOCK_V1:
|
||
|
journal->j_format_version = 1;
|
||
|
if (jsb->s_feature_compat ||
|
||
|
jsb->s_feature_incompat ||
|
||
|
jsb->s_feature_ro_compat ||
|
||
|
jsb->s_nr_users)
|
||
|
clear_v2_journal_fields(journal);
|
||
|
break;
|
||
|
|
||
|
case JFS_SUPERBLOCK_V2:
|
||
|
journal->j_format_version = 2;
|
||
|
if (ntohl(jsb->s_nr_users) > 1 &&
|
||
|
uuid_is_null(ctx->fs->super->s_journal_uuid))
|
||
|
clear_v2_journal_fields(journal);
|
||
|
if (ntohl(jsb->s_nr_users) > 1) {
|
||
|
fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
|
||
|
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
/*
|
||
|
* These should never appear in a journal super block, so if
|
||
|
* they do, the journal is badly corrupted.
|
||
|
*/
|
||
|
case JFS_DESCRIPTOR_BLOCK:
|
||
|
case JFS_COMMIT_BLOCK:
|
||
|
case JFS_REVOKE_BLOCK:
|
||
|
return EXT2_ET_CORRUPT_SUPERBLOCK;
|
||
|
|
||
|
/* If we don't understand the superblock major type, but there
|
||
|
* is a magic number, then it is likely to be a new format we
|
||
|
* just don't understand, so leave it alone. */
|
||
|
default:
|
||
|
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
|
||
|
}
|
||
|
|
||
|
if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
|
||
|
return EXT2_ET_UNSUPP_FEATURE;
|
||
|
|
||
|
if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
|
||
|
return EXT2_ET_RO_UNSUPP_FEATURE;
|
||
|
|
||
|
/* We have now checked whether we know enough about the journal
|
||
|
* format to be able to proceed safely, so any other checks that
|
||
|
* fail we should attempt to recover from. */
|
||
|
if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
|
||
|
com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
|
||
|
_("%s: no valid journal superblock found\n"),
|
||
|
ctx->device_name);
|
||
|
return EXT2_ET_CORRUPT_SUPERBLOCK;
|
||
|
}
|
||
|
|
||
|
if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
|
||
|
journal->j_maxlen = ntohl(jsb->s_maxlen);
|
||
|
else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
|
||
|
com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
|
||
|
_("%s: journal too short\n"),
|
||
|
ctx->device_name);
|
||
|
return EXT2_ET_CORRUPT_SUPERBLOCK;
|
||
|
}
|
||
|
|
||
|
journal->j_tail_sequence = ntohl(jsb->s_sequence);
|
||
|
journal->j_transaction_sequence = journal->j_tail_sequence;
|
||
|
journal->j_tail = ntohl(jsb->s_start);
|
||
|
journal->j_first = ntohl(jsb->s_first);
|
||
|
journal->j_last = ntohl(jsb->s_maxlen);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
|
||
|
journal_t *journal)
|
||
|
{
|
||
|
char *p;
|
||
|
union {
|
||
|
uuid_t uuid;
|
||
|
__u32 val[4];
|
||
|
} u;
|
||
|
__u32 new_seq = 0;
|
||
|
int i;
|
||
|
|
||
|
/* Leave a valid existing V1 superblock signature alone.
|
||
|
* Anything unrecognisable we overwrite with a new V2
|
||
|
* signature. */
|
||
|
|
||
|
if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
|
||
|
jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
|
||
|
jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
|
||
|
jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
|
||
|
}
|
||
|
|
||
|
/* Zero out everything else beyond the superblock header */
|
||
|
|
||
|
p = ((char *) jsb) + sizeof(journal_header_t);
|
||
|
memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
|
||
|
|
||
|
jsb->s_blocksize = htonl(ctx->fs->blocksize);
|
||
|
jsb->s_maxlen = htonl(journal->j_maxlen);
|
||
|
jsb->s_first = htonl(1);
|
||
|
|
||
|
/* Initialize the journal sequence number so that there is "no"
|
||
|
* chance we will find old "valid" transactions in the journal.
|
||
|
* This avoids the need to zero the whole journal (slow to do,
|
||
|
* and risky when we are just recovering the filesystem).
|
||
|
*/
|
||
|
uuid_generate(u.uuid);
|
||
|
for (i = 0; i < 4; i ++)
|
||
|
new_seq ^= u.val[i];
|
||
|
jsb->s_sequence = htonl(new_seq);
|
||
|
|
||
|
mark_buffer_dirty(journal->j_sb_buffer);
|
||
|
ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
|
||
|
}
|
||
|
|
||
|
static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
|
||
|
journal_t *journal,
|
||
|
struct problem_context *pctx)
|
||
|
{
|
||
|
struct ext2_super_block *sb = ctx->fs->super;
|
||
|
int recover = ctx->fs->super->s_feature_incompat &
|
||
|
EXT3_FEATURE_INCOMPAT_RECOVER;
|
||
|
|
||
|
if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
|
||
|
if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
|
||
|
e2fsck_journal_reset_super(ctx, journal->j_superblock,
|
||
|
journal);
|
||
|
journal->j_transaction_sequence = 1;
|
||
|
e2fsck_clear_recover(ctx, recover);
|
||
|
return 0;
|
||
|
}
|
||
|
return EXT2_ET_CORRUPT_SUPERBLOCK;
|
||
|
} else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
|
||
|
return EXT2_ET_CORRUPT_SUPERBLOCK;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
|
||
|
int reset, int drop)
|
||
|
{
|
||
|
journal_superblock_t *jsb;
|
||
|
|
||
|
if (drop)
|
||
|
mark_buffer_clean(journal->j_sb_buffer);
|
||
|
else if (!(ctx->options & E2F_OPT_READONLY)) {
|
||
|
jsb = journal->j_superblock;
|
||
|
jsb->s_sequence = htonl(journal->j_transaction_sequence);
|
||
|
if (reset)
|
||
|
jsb->s_start = 0; /* this marks the journal as empty */
|
||
|
mark_buffer_dirty(journal->j_sb_buffer);
|
||
|
}
|
||
|
brelse(journal->j_sb_buffer);
|
||
|
|
||
|
if (ctx->journal_io) {
|
||
|
if (ctx->fs && ctx->fs->io != ctx->journal_io)
|
||
|
io_channel_close(ctx->journal_io);
|
||
|
ctx->journal_io = 0;
|
||
|
}
|
||
|
|
||
|
#ifndef USE_INODE_IO
|
||
|
if (journal->j_inode)
|
||
|
ext2fs_free_mem(&journal->j_inode);
|
||
|
#endif
|
||
|
if (journal->j_fs_dev)
|
||
|
ext2fs_free_mem(&journal->j_fs_dev);
|
||
|
ext2fs_free_mem(&journal);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This function makes sure that the superblock fields regarding the
|
||
|
* journal are consistent.
|
||
|
*/
|
||
|
int e2fsck_check_ext3_journal(e2fsck_t ctx)
|
||
|
{
|
||
|
struct ext2_super_block *sb = ctx->fs->super;
|
||
|
journal_t *journal;
|
||
|
int recover = ctx->fs->super->s_feature_incompat &
|
||
|
EXT3_FEATURE_INCOMPAT_RECOVER;
|
||
|
struct problem_context pctx;
|
||
|
problem_t problem;
|
||
|
int reset = 0, force_fsck = 0;
|
||
|
int retval;
|
||
|
|
||
|
/* If we don't have any journal features, don't do anything more */
|
||
|
if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
|
||
|
!recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
|
||
|
uuid_is_null(sb->s_journal_uuid))
|
||
|
return 0;
|
||
|
|
||
|
clear_problem_context(&pctx);
|
||
|
pctx.num = sb->s_journal_inum;
|
||
|
|
||
|
retval = e2fsck_get_journal(ctx, &journal);
|
||
|
if (retval) {
|
||
|
if ((retval == EXT2_ET_BAD_INODE_NUM) ||
|
||
|
(retval == EXT2_ET_BAD_BLOCK_NUM) ||
|
||
|
(retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
|
||
|
(retval == EXT2_ET_NO_JOURNAL))
|
||
|
return e2fsck_journal_fix_bad_inode(ctx, &pctx);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
retval = e2fsck_journal_load(journal);
|
||
|
if (retval) {
|
||
|
if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
|
||
|
((retval == EXT2_ET_UNSUPP_FEATURE) &&
|
||
|
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
|
||
|
&pctx))) ||
|
||
|
((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
|
||
|
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
|
||
|
&pctx))) ||
|
||
|
((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
|
||
|
(!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
|
||
|
retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
|
||
|
&pctx);
|
||
|
e2fsck_journal_release(ctx, journal, 0, 1);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We want to make the flags consistent here. We will not leave with
|
||
|
* needs_recovery set but has_journal clear. We can't get in a loop
|
||
|
* with -y, -n, or -p, only if a user isn't making up their mind.
|
||
|
*/
|
||
|
no_has_journal:
|
||
|
if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
|
||
|
recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
|
||
|
pctx.str = "inode";
|
||
|
if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
|
||
|
if (recover &&
|
||
|
!fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
|
||
|
goto no_has_journal;
|
||
|
/*
|
||
|
* Need a full fsck if we are releasing a
|
||
|
* journal stored on a reserved inode.
|
||
|
*/
|
||
|
force_fsck = recover ||
|
||
|
(sb->s_journal_inum < EXT2_FIRST_INODE(sb));
|
||
|
/* Clear all of the journal fields */
|
||
|
sb->s_journal_inum = 0;
|
||
|
sb->s_journal_dev = 0;
|
||
|
memset(sb->s_journal_uuid, 0,
|
||
|
sizeof(sb->s_journal_uuid));
|
||
|
e2fsck_clear_recover(ctx, force_fsck);
|
||
|
} else if (!(ctx->options & E2F_OPT_READONLY)) {
|
||
|
sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
|
||
|
ext2fs_mark_super_dirty(ctx->fs);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
|
||
|
!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
|
||
|
journal->j_superblock->s_start != 0) {
|
||
|
/* Print status information */
|
||
|
fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
|
||
|
if (ctx->superblock)
|
||
|
problem = PR_0_JOURNAL_RUN_DEFAULT;
|
||
|
else
|
||
|
problem = PR_0_JOURNAL_RUN;
|
||
|
if (fix_problem(ctx, problem, &pctx)) {
|
||
|
ctx->options |= E2F_OPT_FORCE;
|
||
|
sb->s_feature_incompat |=
|
||
|
EXT3_FEATURE_INCOMPAT_RECOVER;
|
||
|
ext2fs_mark_super_dirty(ctx->fs);
|
||
|
} else if (fix_problem(ctx,
|
||
|
PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
|
||
|
reset = 1;
|
||
|
sb->s_state &= ~EXT2_VALID_FS;
|
||
|
ext2fs_mark_super_dirty(ctx->fs);
|
||
|
}
|
||
|
/*
|
||
|
* If the user answers no to the above question, we
|
||
|
* ignore the fact that journal apparently has data;
|
||
|
* accidentally replaying over valid data would be far
|
||
|
* worse than skipping a questionable recovery.
|
||
|
*
|
||
|
* XXX should we abort with a fatal error here? What
|
||
|
* will the ext3 kernel code do if a filesystem with
|
||
|
* !NEEDS_RECOVERY but with a non-zero
|
||
|
* journal->j_superblock->s_start is mounted?
|
||
|
*/
|
||
|
}
|
||
|
|
||
|
e2fsck_journal_release(ctx, journal, reset, 0);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static errcode_t recover_ext3_journal(e2fsck_t ctx)
|
||
|
{
|
||
|
journal_t *journal;
|
||
|
int retval;
|
||
|
|
||
|
journal_init_revoke_caches();
|
||
|
retval = e2fsck_get_journal(ctx, &journal);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
retval = e2fsck_journal_load(journal);
|
||
|
if (retval)
|
||
|
goto errout;
|
||
|
|
||
|
retval = journal_init_revoke(journal, 1024);
|
||
|
if (retval)
|
||
|
goto errout;
|
||
|
|
||
|
retval = -journal_recover(journal);
|
||
|
if (retval)
|
||
|
goto errout;
|
||
|
|
||
|
if (journal->j_superblock->s_errno) {
|
||
|
ctx->fs->super->s_state |= EXT2_ERROR_FS;
|
||
|
ext2fs_mark_super_dirty(ctx->fs);
|
||
|
journal->j_superblock->s_errno = 0;
|
||
|
mark_buffer_dirty(journal->j_sb_buffer);
|
||
|
}
|
||
|
|
||
|
errout:
|
||
|
journal_destroy_revoke(journal);
|
||
|
journal_destroy_revoke_caches();
|
||
|
e2fsck_journal_release(ctx, journal, 1, 0);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
int e2fsck_run_ext3_journal(e2fsck_t ctx)
|
||
|
{
|
||
|
io_manager io_ptr = ctx->fs->io->manager;
|
||
|
int blocksize = ctx->fs->blocksize;
|
||
|
errcode_t retval, recover_retval;
|
||
|
|
||
|
printf(_("%s: recovering journal\n"), ctx->device_name);
|
||
|
if (ctx->options & E2F_OPT_READONLY) {
|
||
|
printf(_("%s: won't do journal recovery while read-only\n"),
|
||
|
ctx->device_name);
|
||
|
return EXT2_ET_FILE_RO;
|
||
|
}
|
||
|
|
||
|
if (ctx->fs->flags & EXT2_FLAG_DIRTY)
|
||
|
ext2fs_flush(ctx->fs); /* Force out any modifications */
|
||
|
|
||
|
recover_retval = recover_ext3_journal(ctx);
|
||
|
|
||
|
/*
|
||
|
* Reload the filesystem context to get up-to-date data from disk
|
||
|
* because journal recovery will change the filesystem under us.
|
||
|
*/
|
||
|
ext2fs_close(ctx->fs);
|
||
|
retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
|
||
|
ctx->superblock, blocksize, io_ptr,
|
||
|
&ctx->fs);
|
||
|
|
||
|
if (retval) {
|
||
|
com_err(ctx->program_name, retval,
|
||
|
_("while trying to re-open %s"),
|
||
|
ctx->device_name);
|
||
|
fatal_error(ctx, 0);
|
||
|
}
|
||
|
ctx->fs->priv_data = ctx;
|
||
|
|
||
|
/* Set the superblock flags */
|
||
|
e2fsck_clear_recover(ctx, recover_retval);
|
||
|
return recover_retval;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This function will move the journal inode from a visible file in
|
||
|
* the filesystem directory hierarchy to the reserved inode if necessary.
|
||
|
*/
|
||
|
static const char * const journal_names[] = {
|
||
|
".journal", "journal", ".journal.dat", "journal.dat", 0 };
|
||
|
|
||
|
void e2fsck_move_ext3_journal(e2fsck_t ctx)
|
||
|
{
|
||
|
struct ext2_super_block *sb = ctx->fs->super;
|
||
|
struct problem_context pctx;
|
||
|
struct ext2_inode inode;
|
||
|
ext2_filsys fs = ctx->fs;
|
||
|
ext2_ino_t ino;
|
||
|
errcode_t retval;
|
||
|
const char * const * cpp;
|
||
|
int group, mount_flags;
|
||
|
|
||
|
clear_problem_context(&pctx);
|
||
|
|
||
|
/*
|
||
|
* If the filesystem is opened read-only, or there is no
|
||
|
* journal, then do nothing.
|
||
|
*/
|
||
|
if ((ctx->options & E2F_OPT_READONLY) ||
|
||
|
(sb->s_journal_inum == 0) ||
|
||
|
!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* Read in the journal inode
|
||
|
*/
|
||
|
if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* If it's necessary to backup the journal inode, do so.
|
||
|
*/
|
||
|
if ((sb->s_jnl_backup_type == 0) ||
|
||
|
((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
|
||
|
memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
|
||
|
if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
|
||
|
memcpy(sb->s_jnl_blocks, inode.i_block,
|
||
|
EXT2_N_BLOCKS*4);
|
||
|
sb->s_jnl_blocks[16] = inode.i_size;
|
||
|
sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
|
||
|
ext2fs_mark_super_dirty(fs);
|
||
|
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* If the journal is already the hidden inode, then do nothing
|
||
|
*/
|
||
|
if (sb->s_journal_inum == EXT2_JOURNAL_INO)
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* The journal inode had better have only one link and not be readable.
|
||
|
*/
|
||
|
if (inode.i_links_count != 1)
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* If the filesystem is mounted, or we can't tell whether
|
||
|
* or not it's mounted, do nothing.
|
||
|
*/
|
||
|
retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
|
||
|
if (retval || (mount_flags & EXT2_MF_MOUNTED))
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* If we can't find the name of the journal inode, then do
|
||
|
* nothing.
|
||
|
*/
|
||
|
for (cpp = journal_names; *cpp; cpp++) {
|
||
|
retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
|
||
|
strlen(*cpp), 0, &ino);
|
||
|
if ((retval == 0) && (ino == sb->s_journal_inum))
|
||
|
break;
|
||
|
}
|
||
|
if (*cpp == 0)
|
||
|
return;
|
||
|
|
||
|
/* We need the inode bitmap to be loaded */
|
||
|
retval = ext2fs_read_bitmaps(fs);
|
||
|
if (retval)
|
||
|
return;
|
||
|
|
||
|
pctx.str = *cpp;
|
||
|
if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* OK, we've done all the checks, let's actually move the
|
||
|
* journal inode. Errors at this point mean we need to force
|
||
|
* an ext2 filesystem check.
|
||
|
*/
|
||
|
if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
|
||
|
goto err_out;
|
||
|
if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
|
||
|
goto err_out;
|
||
|
sb->s_journal_inum = EXT2_JOURNAL_INO;
|
||
|
ext2fs_mark_super_dirty(fs);
|
||
|
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
|
||
|
inode.i_links_count = 0;
|
||
|
inode.i_dtime = time(0);
|
||
|
if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
|
||
|
goto err_out;
|
||
|
|
||
|
group = ext2fs_group_of_ino(fs, ino);
|
||
|
ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
|
||
|
ext2fs_mark_ib_dirty(fs);
|
||
|
fs->group_desc[group].bg_free_inodes_count++;
|
||
|
fs->super->s_free_inodes_count++;
|
||
|
return;
|
||
|
|
||
|
err_out:
|
||
|
pctx.errcode = retval;
|
||
|
fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
|
||
|
fs->super->s_state &= ~EXT2_VALID_FS;
|
||
|
ext2fs_mark_super_dirty(fs);
|
||
|
return;
|
||
|
}
|
||
|
|