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-rw-r--r--e2fsck/journal.c1900
1 files changed, 1900 insertions, 0 deletions
diff --git a/e2fsck/journal.c b/e2fsck/journal.c
new file mode 100644
index 0000000..c7868d8
--- /dev/null
+++ b/e2fsck/journal.c
@@ -0,0 +1,1900 @@
+/*
+ * journal.c --- code for handling the "ext3" journal
+ *
+ * Copyright (C) 2000 Andreas Dilger
+ * Copyright (C) 2000 Theodore Ts'o
+ *
+ * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
+ * Copyright (C) 1999 Red Hat Software
+ *
+ * This file may be redistributed under the terms of the
+ * GNU General Public License version 2 or at your discretion
+ * any later version.
+ */
+
+#include "config.h"
+#ifdef HAVE_SYS_MOUNT_H
+#include <sys/param.h>
+#include <sys/mount.h>
+#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+
+#define E2FSCK_INCLUDE_INLINE_FUNCS
+#include "jfs_user.h"
+#include "problem.h"
+#include "uuid/uuid.h"
+
+static int bh_count = 0;
+
+/*
+ * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
+ * This creates a larger static binary, and a smaller binary using
+ * shared libraries. It's also probably slightly less CPU-efficient,
+ * which is why it's not on by default. But, it's a good way of
+ * testing the functions in inode_io.c and fileio.c.
+ */
+#undef USE_INODE_IO
+
+/* Checksumming functions */
+static int e2fsck_journal_verify_csum_type(journal_t *j,
+ journal_superblock_t *jsb)
+{
+ if (!jbd2_journal_has_csum_v2or3(j))
+ return 1;
+
+ return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
+}
+
+static __u32 e2fsck_journal_sb_csum(journal_superblock_t *jsb)
+{
+ __u32 crc, old_crc;
+
+ old_crc = jsb->s_checksum;
+ jsb->s_checksum = 0;
+ crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
+ sizeof(journal_superblock_t));
+ jsb->s_checksum = old_crc;
+
+ return crc;
+}
+
+static int e2fsck_journal_sb_csum_verify(journal_t *j,
+ journal_superblock_t *jsb)
+{
+ __u32 provided, calculated;
+
+ if (!jbd2_journal_has_csum_v2or3(j))
+ return 1;
+
+ provided = ext2fs_be32_to_cpu(jsb->s_checksum);
+ calculated = e2fsck_journal_sb_csum(jsb);
+
+ return provided == calculated;
+}
+
+static errcode_t e2fsck_journal_sb_csum_set(journal_t *j,
+ journal_superblock_t *jsb)
+{
+ __u32 crc;
+
+ if (!jbd2_journal_has_csum_v2or3(j))
+ return 0;
+
+ crc = e2fsck_journal_sb_csum(jsb);
+ jsb->s_checksum = ext2fs_cpu_to_be32(crc);
+ return 0;
+}
+
+/* Kernel compatibility functions for handling the journal. These allow us
+ * to use the recovery.c file virtually unchanged from the kernel, so we
+ * don't have to do much to keep kernel and user recovery in sync.
+ */
+int jbd2_journal_bmap(journal_t *journal, unsigned long block,
+ unsigned long long *phys)
+{
+#ifdef USE_INODE_IO
+ *phys = block;
+ return 0;
+#else
+ struct inode *inode = journal->j_inode;
+ errcode_t retval;
+ blk64_t pblk;
+
+ if (!inode) {
+ *phys = block;
+ return 0;
+ }
+
+ retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
+ &inode->i_ext2, NULL, 0, (blk64_t) block,
+ 0, &pblk);
+ *phys = pblk;
+ return -1 * ((int) retval);
+#endif
+}
+
+struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
+ int blocksize)
+{
+ struct buffer_head *bh;
+ int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
+ sizeof(bh->b_data);
+
+ bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
+ if (!bh)
+ return NULL;
+
+ if (journal_enable_debug >= 3)
+ bh_count++;
+ jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
+ blocknr, blocksize, bh_count);
+
+ bh->b_ctx = kdev->k_ctx;
+ if (kdev->k_dev == K_DEV_FS)
+ bh->b_io = kdev->k_ctx->fs->io;
+ else
+ bh->b_io = kdev->k_ctx->journal_io;
+ bh->b_size = blocksize;
+ bh->b_blocknr = blocknr;
+
+ return bh;
+}
+
+int sync_blockdev(kdev_t kdev)
+{
+ io_channel io;
+
+ if (kdev->k_dev == K_DEV_FS)
+ io = kdev->k_ctx->fs->io;
+ else
+ io = kdev->k_ctx->journal_io;
+
+ return io_channel_flush(io) ? -EIO : 0;
+}
+
+void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
+ struct buffer_head *bhp[])
+{
+ errcode_t retval;
+ struct buffer_head *bh;
+
+ for (; nr > 0; --nr) {
+ bh = *bhp++;
+ if (rw == REQ_OP_READ && !bh->b_uptodate) {
+ jfs_debug(3, "reading block %llu/%p\n",
+ bh->b_blocknr, (void *) bh);
+ retval = io_channel_read_blk64(bh->b_io,
+ bh->b_blocknr,
+ 1, bh->b_data);
+ if (retval) {
+ com_err(bh->b_ctx->device_name, retval,
+ "while reading block %llu\n",
+ bh->b_blocknr);
+ bh->b_err = (int) retval;
+ continue;
+ }
+ bh->b_uptodate = 1;
+ } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
+ jfs_debug(3, "writing block %llu/%p\n",
+ bh->b_blocknr,
+ (void *) bh);
+ retval = io_channel_write_blk64(bh->b_io,
+ bh->b_blocknr,
+ 1, bh->b_data);
+ if (retval) {
+ com_err(bh->b_ctx->device_name, retval,
+ "while writing block %llu\n",
+ bh->b_blocknr);
+ bh->b_err = (int) retval;
+ continue;
+ }
+ bh->b_dirty = 0;
+ bh->b_uptodate = 1;
+ } else {
+ jfs_debug(3, "no-op %s for block %llu\n",
+ rw == REQ_OP_READ ? "read" : "write",
+ bh->b_blocknr);
+ }
+ }
+}
+
+void mark_buffer_dirty(struct buffer_head *bh)
+{
+ bh->b_dirty = 1;
+}
+
+static void mark_buffer_clean(struct buffer_head * bh)
+{
+ bh->b_dirty = 0;
+}
+
+void brelse(struct buffer_head *bh)
+{
+ if (bh->b_dirty)
+ ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
+ jfs_debug(3, "freeing block %llu/%p (total %d)\n",
+ bh->b_blocknr, (void *) bh, --bh_count);
+ ext2fs_free_mem(&bh);
+}
+
+int buffer_uptodate(struct buffer_head *bh)
+{
+ return bh->b_uptodate;
+}
+
+void mark_buffer_uptodate(struct buffer_head *bh, int val)
+{
+ bh->b_uptodate = val;
+}
+
+void wait_on_buffer(struct buffer_head *bh)
+{
+ if (!bh->b_uptodate)
+ ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+}
+
+
+static void e2fsck_clear_recover(e2fsck_t ctx, int error)
+{
+ ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
+
+ /* if we had an error doing journal recovery, we need a full fsck */
+ if (error)
+ ctx->fs->super->s_state &= ~EXT2_VALID_FS;
+ ext2fs_mark_super_dirty(ctx->fs);
+}
+
+/*
+ * This is a helper function to check the validity of the journal.
+ */
+struct process_block_struct {
+ e2_blkcnt_t last_block;
+};
+
+static int process_journal_block(ext2_filsys fs,
+ blk64_t *block_nr,
+ e2_blkcnt_t blockcnt,
+ blk64_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct process_block_struct *p;
+ blk64_t blk = *block_nr;
+
+ p = (struct process_block_struct *) priv_data;
+
+ if (!blk || blk < fs->super->s_first_data_block ||
+ blk >= ext2fs_blocks_count(fs->super))
+ return BLOCK_ABORT;
+
+ if (blockcnt >= 0)
+ p->last_block = blockcnt;
+ return 0;
+}
+
+static int ext4_fc_replay_scan(journal_t *j, struct buffer_head *bh,
+ int off, tid_t expected_tid)
+{
+ e2fsck_t ctx = j->j_fs_dev->k_ctx;
+ struct e2fsck_fc_replay_state *state;
+ int ret = JBD2_FC_REPLAY_CONTINUE;
+ struct ext4_fc_add_range ext;
+ struct ext4_fc_tl tl;
+ struct ext4_fc_tail tail;
+ __u8 *start, *cur, *end, *val;
+ struct ext4_fc_head head;
+ struct ext2fs_extent ext2fs_ex = {0};
+
+ state = &ctx->fc_replay_state;
+
+ start = (__u8 *)bh->b_data;
+ end = (__u8 *)bh->b_data + j->j_blocksize - 1;
+
+ jbd_debug(1, "Scan phase starting, expected %d", expected_tid);
+ if (state->fc_replay_expected_off == 0) {
+ memset(state, 0, sizeof(*state));
+ /* Check if we can stop early */
+ if (le16_to_cpu(((struct ext4_fc_tl *)start)->fc_tag)
+ != EXT4_FC_TAG_HEAD) {
+ jbd_debug(1, "Ending early!, not a head tag");
+ return 0;
+ }
+ }
+
+ if (off != state->fc_replay_expected_off) {
+ ret = -EFSCORRUPTED;
+ goto out_err;
+ }
+
+ state->fc_replay_expected_off++;
+ for (cur = start; cur < end; cur = cur + le16_to_cpu(tl.fc_len) + sizeof(tl)) {
+ memcpy(&tl, cur, sizeof(tl));
+ val = cur + sizeof(tl);
+
+ jbd_debug(3, "Scan phase, tag:%s, blk %lld\n",
+ tag2str(le16_to_cpu(tl.fc_tag)), bh->b_blocknr);
+ switch (le16_to_cpu(tl.fc_tag)) {
+ case EXT4_FC_TAG_ADD_RANGE:
+ memcpy(&ext, val, sizeof(ext));
+ ret = ext2fs_decode_extent(&ext2fs_ex,
+ (void *)&ext.fc_ex,
+ sizeof(ext.fc_ex));
+ if (ret)
+ ret = JBD2_FC_REPLAY_STOP;
+ else
+ ret = JBD2_FC_REPLAY_CONTINUE;
+ /* fallthrough */
+ case EXT4_FC_TAG_DEL_RANGE:
+ case EXT4_FC_TAG_LINK:
+ case EXT4_FC_TAG_UNLINK:
+ case EXT4_FC_TAG_CREAT:
+ case EXT4_FC_TAG_INODE:
+ case EXT4_FC_TAG_PAD:
+ state->fc_cur_tag++;
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
+ sizeof(tl) + ext4_fc_tag_len(&tl));
+ break;
+ case EXT4_FC_TAG_TAIL:
+ state->fc_cur_tag++;
+ memcpy(&tail, val, sizeof(tail));
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
+ sizeof(tl) +
+ offsetof(struct ext4_fc_tail,
+ fc_crc));
+ jbd_debug(1, "tail tid %d, expected %d\n",
+ le32_to_cpu(tail.fc_tid), expected_tid);
+ if (le32_to_cpu(tail.fc_tid) == expected_tid &&
+ le32_to_cpu(tail.fc_crc) == state->fc_crc) {
+ state->fc_replay_num_tags = state->fc_cur_tag;
+ } else {
+ ret = state->fc_replay_num_tags ?
+ JBD2_FC_REPLAY_STOP : -EFSBADCRC;
+ }
+ state->fc_crc = 0;
+ break;
+ case EXT4_FC_TAG_HEAD:
+ memcpy(&head, val, sizeof(head));
+ if (le32_to_cpu(head.fc_features) &
+ ~EXT4_FC_SUPPORTED_FEATURES) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ if (le32_to_cpu(head.fc_tid) != expected_tid) {
+ ret = -EINVAL;
+ break;
+ }
+ state->fc_cur_tag++;
+ state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
+ sizeof(tl) + ext4_fc_tag_len(&tl));
+ break;
+ default:
+ ret = state->fc_replay_num_tags ?
+ JBD2_FC_REPLAY_STOP : -ECANCELED;
+ }
+ if (ret < 0 || ret == JBD2_FC_REPLAY_STOP)
+ break;
+ }
+
+out_err:
+ return ret;
+}
+
+static int __errcode_to_errno(errcode_t err, const char *func, int line)
+{
+ if (err == 0)
+ return 0;
+ fprintf(stderr, "Error \"%s\" encountered in function %s at line %d\n",
+ error_message(err), func, line);
+ if (err <= 256)
+ return -err;
+ return -EFAULT;
+}
+
+#define errcode_to_errno(err) __errcode_to_errno(err, __func__, __LINE__)
+
+#define ex_end(__ex) ((__ex)->e_lblk + (__ex)->e_len - 1)
+#define ex_pend(__ex) ((__ex)->e_pblk + (__ex)->e_len - 1)
+
+static int make_room(struct extent_list *list, int i)
+{
+ int ret;
+
+ if (list->count == list->size) {
+ unsigned int new_size = (list->size + 341) *
+ sizeof(struct ext2fs_extent);
+ ret = errcode_to_errno(ext2fs_resize_mem(0, new_size, &list->extents));
+ if (ret)
+ return ret;
+ list->size += 341;
+ }
+
+ memmove(&list->extents[i + 1], &list->extents[i],
+ sizeof(list->extents[0]) * (list->count - i));
+ list->count++;
+ return 0;
+}
+
+static int ex_compar(const void *arg1, const void *arg2)
+{
+ const struct ext2fs_extent *ex1 = (const struct ext2fs_extent *)arg1;
+ const struct ext2fs_extent *ex2 = (const struct ext2fs_extent *)arg2;
+
+ if (ex1->e_lblk < ex2->e_lblk)
+ return -1;
+ if (ex1->e_lblk > ex2->e_lblk)
+ return 1;
+ return ex1->e_len - ex2->e_len;
+}
+
+static int ex_len_compar(const void *arg1, const void *arg2)
+{
+ const struct ext2fs_extent *ex1 = (const struct ext2fs_extent *)arg1;
+ const struct ext2fs_extent *ex2 = (const struct ext2fs_extent *)arg2;
+
+ if (ex1->e_len < ex2->e_len)
+ return 1;
+
+ if (ex1->e_lblk > ex2->e_lblk)
+ return -1;
+
+ return 0;
+}
+
+static void ex_sort_and_merge(struct extent_list *list)
+{
+ unsigned int i, j;
+
+ if (list->count < 2)
+ return;
+
+ /*
+ * Reverse sort by length, that way we strip off all the 0 length
+ * extents
+ */
+ qsort(list->extents, list->count, sizeof(struct ext2fs_extent),
+ ex_len_compar);
+
+ for (i = 0; i < list->count; i++) {
+ if (list->extents[i].e_len == 0) {
+ list->count = i;
+ break;
+ }
+ }
+
+ if (list->count == 0)
+ return;
+
+ /* Now sort by logical offset */
+ qsort(list->extents, list->count, sizeof(list->extents[0]),
+ ex_compar);
+
+ /* Merge adjacent extents if they are logically and physically contiguous */
+ i = 0;
+ while (i < list->count - 1) {
+ if (ex_end(&list->extents[i]) + 1 != list->extents[i + 1].e_lblk ||
+ ex_pend(&list->extents[i]) + 1 != list->extents[i + 1].e_pblk ||
+ (list->extents[i].e_flags & EXT2_EXTENT_FLAGS_UNINIT) !=
+ (list->extents[i + 1].e_flags & EXT2_EXTENT_FLAGS_UNINIT)) {
+ i++;
+ continue;
+ }
+
+ list->extents[i].e_len += list->extents[i + 1].e_len;
+ for (j = i + 1; j < list->count - 1; j++)
+ list->extents[j] = list->extents[j + 1];
+ list->count--;
+ }
+}
+
+/* must free blocks that are released */
+static int ext4_modify_extent_list(e2fsck_t ctx, struct extent_list *list,
+ struct ext2fs_extent *ex, int del)
+{
+ int ret, offset;
+ unsigned int i;
+ struct ext2fs_extent add_ex = *ex;
+
+ /* First let's create a hole from ex->e_lblk of length ex->e_len */
+ for (i = 0; i < list->count; i++) {
+ if (ex_end(&list->extents[i]) < add_ex.e_lblk)
+ continue;
+
+ /* Case 1: No overlap */
+ if (list->extents[i].e_lblk > ex_end(&add_ex))
+ break;
+ /*
+ * Unmark all the blocks in bb now. All the blocks get marked
+ * before we exit this function.
+ */
+ ext2fs_unmark_block_bitmap_range2(ctx->fs->block_map,
+ list->extents[i].e_pblk, list->extents[i].e_len);
+ /* Case 2: Split */
+ if (list->extents[i].e_lblk < add_ex.e_lblk &&
+ ex_end(&list->extents[i]) > ex_end(&add_ex)) {
+ ret = make_room(list, i + 1);
+ if (ret)
+ return ret;
+ list->extents[i + 1] = list->extents[i];
+ offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
+ list->extents[i + 1].e_lblk += offset;
+ list->extents[i + 1].e_pblk += offset;
+ list->extents[i + 1].e_len -= offset;
+ list->extents[i].e_len =
+ add_ex.e_lblk - list->extents[i].e_lblk;
+ break;
+ }
+
+ /* Case 3: Exact overlap */
+ if (add_ex.e_lblk <= list->extents[i].e_lblk &&
+ ex_end(&list->extents[i]) <= ex_end(&add_ex)) {
+
+ list->extents[i].e_len = 0;
+ continue;
+ }
+
+ /* Case 4: Partial overlap */
+ if (ex_end(&list->extents[i]) > ex_end(&add_ex)) {
+ offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
+ list->extents[i].e_lblk += offset;
+ list->extents[i].e_pblk += offset;
+ list->extents[i].e_len -= offset;
+ break;
+ }
+
+ if (ex_end(&add_ex) >= ex_end(&list->extents[i]))
+ list->extents[i].e_len =
+ add_ex.e_lblk > list->extents[i].e_lblk ?
+ add_ex.e_lblk - list->extents[i].e_lblk : 0;
+ }
+
+ if (add_ex.e_len && !del) {
+ make_room(list, list->count);
+ list->extents[list->count - 1] = add_ex;
+ }
+
+ ex_sort_and_merge(list);
+
+ /* Mark all occupied blocks allocated */
+ for (i = 0; i < list->count; i++)
+ ext2fs_mark_block_bitmap_range2(ctx->fs->block_map,
+ list->extents[i].e_pblk, list->extents[i].e_len);
+ ext2fs_mark_bb_dirty(ctx->fs);
+
+ return 0;
+}
+
+static int ext4_add_extent_to_list(e2fsck_t ctx, struct extent_list *list,
+ struct ext2fs_extent *ex)
+{
+ return ext4_modify_extent_list(ctx, list, ex, 0 /* add */);
+}
+
+static int ext4_del_extent_from_list(e2fsck_t ctx, struct extent_list *list,
+ struct ext2fs_extent *ex)
+{
+ return ext4_modify_extent_list(ctx, list, ex, 1 /* delete */);
+}
+
+static int ext4_fc_read_extents(e2fsck_t ctx, ext2_ino_t ino)
+{
+ struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
+
+ if (extent_list->ino == ino)
+ return 0;
+
+ extent_list->ino = ino;
+ return errcode_to_errno(e2fsck_read_extents(ctx, extent_list));
+}
+
+/*
+ * Flush extents in replay state on disk. @ino is the inode that is going
+ * to be processed next. So, we hold back flushing of the extent list
+ * if the next inode that's going to be processed is same as the one with
+ * cached extents in our replay state. That allows us to gather multiple extents
+ * for the inode so that we can flush all of them at once and it also saves us
+ * from continuously growing and shrinking the extent tree.
+ */
+static void ext4_fc_flush_extents(e2fsck_t ctx, ext2_ino_t ino)
+{
+ struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
+
+ if (extent_list->ino == ino || extent_list->ino == 0)
+ return;
+ e2fsck_rewrite_extent_tree(ctx, extent_list);
+ ext2fs_free_mem(&extent_list->extents);
+ memset(extent_list, 0, sizeof(*extent_list));
+}
+
+/* Helper struct for dentry replay routines */
+struct dentry_info_args {
+ ext2_ino_t parent_ino;
+ ext2_ino_t ino;
+ int dname_len;
+ char *dname;
+};
+
+static inline int tl_to_darg(struct dentry_info_args *darg,
+ struct ext4_fc_tl *tl, __u8 *val)
+{
+ struct ext4_fc_dentry_info fcd;
+
+ memcpy(&fcd, val, sizeof(fcd));
+
+ darg->parent_ino = le32_to_cpu(fcd.fc_parent_ino);
+ darg->ino = le32_to_cpu(fcd.fc_ino);
+ darg->dname_len = ext4_fc_tag_len(tl) -
+ sizeof(struct ext4_fc_dentry_info);
+ darg->dname = malloc(darg->dname_len + 1);
+ if (!darg->dname)
+ return -ENOMEM;
+ memcpy(darg->dname,
+ val + sizeof(struct ext4_fc_dentry_info),
+ darg->dname_len);
+ darg->dname[darg->dname_len] = 0;
+ jbd_debug(1, "%s: %s, ino %u, parent %u\n",
+ le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_CREAT ? "create" :
+ (le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_LINK ? "link" :
+ (le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_UNLINK ? "unlink" :
+ "error")), darg->dname, darg->ino, darg->parent_ino);
+ return 0;
+}
+
+static int ext4_fc_handle_unlink(e2fsck_t ctx, struct ext4_fc_tl *tl, __u8 *val)
+{
+ struct dentry_info_args darg;
+ int ret;
+
+ ret = tl_to_darg(&darg, tl, val);
+ if (ret)
+ return ret;
+ ext4_fc_flush_extents(ctx, darg.ino);
+ ret = errcode_to_errno(ext2fs_unlink(ctx->fs, darg.parent_ino,
+ darg.dname, darg.ino, 0));
+ /* It's okay if the above call fails */
+ free(darg.dname);
+
+ return ret;
+}
+
+static int ext4_fc_handle_link_and_create(e2fsck_t ctx, struct ext4_fc_tl *tl, __u8 *val)
+{
+ struct dentry_info_args darg;
+ ext2_filsys fs = ctx->fs;
+ struct ext2_inode_large inode_large;
+ int ret, filetype, mode;
+
+ ret = tl_to_darg(&darg, tl, val);
+ if (ret)
+ return ret;
+ ext4_fc_flush_extents(ctx, 0);
+ ret = errcode_to_errno(ext2fs_read_inode(fs, darg.ino,
+ (struct ext2_inode *)&inode_large));
+ if (ret)
+ goto out;
+
+ mode = inode_large.i_mode;
+
+ if (LINUX_S_ISREG(mode))
+ filetype = EXT2_FT_REG_FILE;
+ else if (LINUX_S_ISDIR(mode))
+ filetype = EXT2_FT_DIR;
+ else if (LINUX_S_ISCHR(mode))
+ filetype = EXT2_FT_CHRDEV;
+ else if (LINUX_S_ISBLK(mode))
+ filetype = EXT2_FT_BLKDEV;
+ else if (LINUX_S_ISLNK(mode))
+ return EXT2_FT_SYMLINK;
+ else if (LINUX_S_ISFIFO(mode))
+ filetype = EXT2_FT_FIFO;
+ else if (LINUX_S_ISSOCK(mode))
+ filetype = EXT2_FT_SOCK;
+ else {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Forcefully unlink if the same name is present and ignore the error
+ * if any, since this dirent might not exist
+ */
+ ext2fs_unlink(fs, darg.parent_ino, darg.dname, darg.ino,
+ EXT2FS_UNLINK_FORCE);
+
+ ret = errcode_to_errno(
+ ext2fs_link(fs, darg.parent_ino, darg.dname, darg.ino,
+ filetype));
+out:
+ free(darg.dname);
+ return ret;
+
+}
+
+/* This function fixes the i_blocks field in the replayed indoe */
+static void ext4_fc_replay_fixup_iblocks(struct ext2_inode_large *ondisk_inode,
+ struct ext2_inode_large *fc_inode)
+{
+ if (ondisk_inode->i_flags & EXT4_EXTENTS_FL) {
+ struct ext3_extent_header *eh;
+
+ eh = (struct ext3_extent_header *)(&ondisk_inode->i_block[0]);
+ if (le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC) {
+ memset(eh, 0, sizeof(*eh));
+ eh->eh_magic = cpu_to_le16(EXT3_EXT_MAGIC);
+ eh->eh_max = cpu_to_le16(
+ (sizeof(ondisk_inode->i_block) -
+ sizeof(struct ext3_extent_header)) /
+ sizeof(struct ext3_extent));
+ }
+ } else if (ondisk_inode->i_flags & EXT4_INLINE_DATA_FL) {
+ memcpy(ondisk_inode->i_block, fc_inode->i_block,
+ sizeof(fc_inode->i_block));
+ }
+}
+
+static int ext4_fc_handle_inode(e2fsck_t ctx, __u8 *val)
+{
+ int ino, inode_len = EXT2_GOOD_OLD_INODE_SIZE;
+ struct ext2_inode_large *inode = NULL, *fc_inode = NULL;
+ __le32 fc_ino;
+ __u8 *fc_raw_inode;
+ errcode_t err;
+ blk64_t blks;
+
+ memcpy(&fc_ino, val, sizeof(fc_ino));
+ fc_raw_inode = val + sizeof(fc_ino);
+ ino = le32_to_cpu(fc_ino);
+
+ if (EXT2_INODE_SIZE(ctx->fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
+ __u16 extra_isize = ext2fs_le16_to_cpu(
+ ((struct ext2_inode_large *)fc_raw_inode)->i_extra_isize);
+
+ if ((extra_isize < (sizeof(inode->i_extra_isize) +
+ sizeof(inode->i_checksum_hi))) ||
+ (extra_isize > (EXT2_INODE_SIZE(ctx->fs->super) -
+ EXT2_GOOD_OLD_INODE_SIZE))) {
+ err = EFSCORRUPTED;
+ goto out;
+ }
+ inode_len += extra_isize;
+ }
+ err = ext2fs_get_mem(inode_len, &inode);
+ if (err)
+ goto out;
+ err = ext2fs_get_mem(inode_len, &fc_inode);
+ if (err)
+ goto out;
+ ext4_fc_flush_extents(ctx, ino);
+
+ err = ext2fs_read_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
+ inode_len);
+ if (err)
+ goto out;
+ memcpy(fc_inode, fc_raw_inode, inode_len);
+#ifdef WORDS_BIGENDIAN
+ ext2fs_swap_inode_full(ctx->fs, fc_inode, fc_inode, 0, inode_len);
+#endif
+ memcpy(inode, fc_inode, offsetof(struct ext2_inode_large, i_block));
+ memcpy(&inode->i_generation, &fc_inode->i_generation,
+ inode_len - offsetof(struct ext2_inode_large, i_generation));
+ ext4_fc_replay_fixup_iblocks(inode, fc_inode);
+ err = ext2fs_count_blocks(ctx->fs, ino, EXT2_INODE(inode), &blks);
+ if (err)
+ goto out;
+ ext2fs_iblk_set(ctx->fs, EXT2_INODE(inode), blks);
+ ext2fs_inode_csum_set(ctx->fs, ino, inode);
+
+ err = ext2fs_write_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
+ inode_len);
+ if (err)
+ goto out;
+ if (inode->i_links_count)
+ ext2fs_mark_inode_bitmap2(ctx->fs->inode_map, ino);
+ else
+ ext2fs_unmark_inode_bitmap2(ctx->fs->inode_map, ino);
+ ext2fs_mark_ib_dirty(ctx->fs);
+
+out:
+ ext2fs_free_mem(&inode);
+ ext2fs_free_mem(&fc_inode);
+ return errcode_to_errno(err);
+}
+
+/*
+ * Handle add extent replay tag.
+ */
+static int ext4_fc_handle_add_extent(e2fsck_t ctx, __u8 *val)
+{
+ struct ext2fs_extent extent;
+ struct ext4_fc_add_range add_range;
+ ext2_ino_t ino;
+ int ret = 0;
+
+ memcpy(&add_range, val, sizeof(add_range));
+ ino = le32_to_cpu(add_range.fc_ino);
+ ext4_fc_flush_extents(ctx, ino);
+
+ ret = ext4_fc_read_extents(ctx, ino);
+ if (ret)
+ return ret;
+ memset(&extent, 0, sizeof(extent));
+ ret = errcode_to_errno(ext2fs_decode_extent(
+ &extent, (void *)add_range.fc_ex,
+ sizeof(add_range.fc_ex)));
+ if (ret)
+ return ret;
+ return ext4_add_extent_to_list(ctx,
+ &ctx->fc_replay_state.fc_extent_list, &extent);
+}
+
+/*
+ * Handle delete logical range replay tag.
+ */
+static int ext4_fc_handle_del_range(e2fsck_t ctx, __u8 *val)
+{
+ struct ext2fs_extent extent;
+ struct ext4_fc_del_range del_range;
+ int ret, ino;
+
+ memcpy(&del_range, val, sizeof(del_range));
+ ino = le32_to_cpu(del_range.fc_ino);
+ ext4_fc_flush_extents(ctx, ino);
+
+ memset(&extent, 0, sizeof(extent));
+ extent.e_lblk = le32_to_cpu(del_range.fc_lblk);
+ extent.e_len = le32_to_cpu(del_range.fc_len);
+ ret = ext4_fc_read_extents(ctx, ino);
+ if (ret)
+ return ret;
+ return ext4_del_extent_from_list(ctx,
+ &ctx->fc_replay_state.fc_extent_list, &extent);
+}
+
+/*
+ * Main recovery path entry point. This function returns JBD2_FC_REPLAY_CONTINUE
+ * to indicate that it is expecting more fast commit blocks. It returns
+ * JBD2_FC_REPLAY_STOP to indicate that replay is done.
+ */
+static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
+ enum passtype pass, int off, tid_t expected_tid)
+{
+ e2fsck_t ctx = journal->j_fs_dev->k_ctx;
+ struct e2fsck_fc_replay_state *state = &ctx->fc_replay_state;
+ int ret = JBD2_FC_REPLAY_CONTINUE;
+ struct ext4_fc_tl tl;
+ __u8 *start, *end, *cur, *val;
+
+ if (pass == PASS_SCAN) {
+ state->fc_current_pass = PASS_SCAN;
+ return ext4_fc_replay_scan(journal, bh, off, expected_tid);
+ }
+
+ if (state->fc_replay_num_tags == 0)
+ goto replay_done;
+
+ if (state->fc_current_pass != pass) {
+ /* Starting replay phase */
+ state->fc_current_pass = pass;
+ /* We will reset checksums */
+ ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ ret = errcode_to_errno(ext2fs_read_bitmaps(ctx->fs));
+ if (ret) {
+ jbd_debug(1, "Error %d while reading bitmaps\n", ret);
+ return ret;
+ }
+ state->fc_super_state = ctx->fs->super->s_state;
+ /*
+ * Mark the file system to indicate it contains errors. That's
+ * because the updates performed by fast commit replay code are
+ * not atomic and may result in inconsistent file system if it
+ * crashes before the replay is complete.
+ */
+ ctx->fs->super->s_state |= EXT2_ERROR_FS;
+ ctx->fs->super->s_state |= EXT4_FC_REPLAY;
+ ext2fs_mark_super_dirty(ctx->fs);
+ ext2fs_flush(ctx->fs);
+ }
+
+ start = (__u8 *)bh->b_data;
+ end = (__u8 *)bh->b_data + journal->j_blocksize - 1;
+
+ for (cur = start; cur < end; cur = cur + le16_to_cpu(tl.fc_len) + sizeof(tl)) {
+ memcpy(&tl, cur, sizeof(tl));
+ val = cur + sizeof(tl);
+
+ if (state->fc_replay_num_tags == 0)
+ goto replay_done;
+ jbd_debug(3, "Replay phase processing %s tag\n",
+ tag2str(le16_to_cpu(tl.fc_tag)));
+ state->fc_replay_num_tags--;
+ switch (le16_to_cpu(tl.fc_tag)) {
+ case EXT4_FC_TAG_CREAT:
+ case EXT4_FC_TAG_LINK:
+ ret = ext4_fc_handle_link_and_create(ctx, &tl, val);
+ break;
+ case EXT4_FC_TAG_UNLINK:
+ ret = ext4_fc_handle_unlink(ctx, &tl, val);
+ break;
+ case EXT4_FC_TAG_ADD_RANGE:
+ ret = ext4_fc_handle_add_extent(ctx, val);
+ break;
+ case EXT4_FC_TAG_DEL_RANGE:
+ ret = ext4_fc_handle_del_range(ctx, val);
+ break;
+ case EXT4_FC_TAG_INODE:
+ ret = ext4_fc_handle_inode(ctx, val);
+ break;
+ case EXT4_FC_TAG_TAIL:
+ ext4_fc_flush_extents(ctx, 0);
+ case EXT4_FC_TAG_PAD:
+ case EXT4_FC_TAG_HEAD:
+ break;
+ default:
+ ret = -ECANCELED;
+ break;
+ }
+ if (ret < 0)
+ break;
+ ret = JBD2_FC_REPLAY_CONTINUE;
+ }
+ return ret;
+replay_done:
+ jbd_debug(1, "End of fast commit replay\n");
+ if (state->fc_current_pass != pass)
+ return JBD2_FC_REPLAY_STOP;
+
+ ext2fs_calculate_summary_stats(ctx->fs, 0 /* update bg also */);
+ ext2fs_write_block_bitmap(ctx->fs);
+ ext2fs_write_inode_bitmap(ctx->fs);
+ ext2fs_mark_super_dirty(ctx->fs);
+ ext2fs_set_gdt_csum(ctx->fs);
+ ctx->fs->super->s_state = state->fc_super_state;
+ ext2fs_flush(ctx->fs);
+
+ return JBD2_FC_REPLAY_STOP;
+}
+
+static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
+{
+ struct process_block_struct pb;
+ struct ext2_super_block *sb = ctx->fs->super;
+ struct ext2_super_block jsuper;
+ struct problem_context pctx;
+ struct buffer_head *bh;
+ struct inode *j_inode = NULL;
+ struct kdev_s *dev_fs = NULL, *dev_journal;
+ const char *journal_name = 0;
+ journal_t *journal = NULL;
+ errcode_t retval = 0;
+ io_manager io_ptr = 0;
+ unsigned long long start = 0;
+ int ret;
+ int ext_journal = 0;
+ int tried_backup_jnl = 0;
+
+ clear_problem_context(&pctx);
+
+ journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
+ if (!journal) {
+ return EXT2_ET_NO_MEMORY;
+ }
+
+ dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
+ if (!dev_fs) {
+ retval = EXT2_ET_NO_MEMORY;
+ goto errout;
+ }
+ dev_journal = dev_fs+1;
+
+ dev_fs->k_ctx = dev_journal->k_ctx = ctx;
+ dev_fs->k_dev = K_DEV_FS;
+ dev_journal->k_dev = K_DEV_JOURNAL;
+
+ journal->j_dev = dev_journal;
+ journal->j_fs_dev = dev_fs;
+ journal->j_inode = NULL;
+ journal->j_blocksize = ctx->fs->blocksize;
+
+ if (uuid_is_null(sb->s_journal_uuid)) {
+ /*
+ * The full set of superblock sanity checks haven't
+ * been performed yet, so we need to do some basic
+ * checks here to avoid potential array overruns.
+ */
+ if (!sb->s_journal_inum ||
+ (sb->s_journal_inum >
+ (ctx->fs->group_desc_count * sb->s_inodes_per_group))) {
+ retval = EXT2_ET_BAD_INODE_NUM;
+ goto errout;
+ }
+ j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
+ "journal inode");
+ if (!j_inode) {
+ retval = EXT2_ET_NO_MEMORY;
+ goto errout;
+ }
+
+ j_inode->i_ctx = ctx;
+ j_inode->i_ino = sb->s_journal_inum;
+
+ if ((retval = ext2fs_read_inode(ctx->fs,
+ sb->s_journal_inum,
+ &j_inode->i_ext2))) {
+ try_backup_journal:
+ if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
+ tried_backup_jnl)
+ goto errout;
+ memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
+ memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
+ EXT2_N_BLOCKS*4);
+ j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
+ j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
+ j_inode->i_ext2.i_links_count = 1;
+ j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
+ e2fsck_use_inode_shortcuts(ctx, 1);
+ ctx->stashed_ino = j_inode->i_ino;
+ ctx->stashed_inode = &j_inode->i_ext2;
+ tried_backup_jnl++;
+ }
+ if (!j_inode->i_ext2.i_links_count ||
+ !LINUX_S_ISREG(j_inode->i_ext2.i_mode) ||
+ (j_inode->i_ext2.i_flags & EXT4_ENCRYPT_FL)) {
+ retval = EXT2_ET_NO_JOURNAL;
+ goto try_backup_journal;
+ }
+ if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
+ JBD2_MIN_JOURNAL_BLOCKS) {
+ retval = EXT2_ET_JOURNAL_TOO_SMALL;
+ goto try_backup_journal;
+ }
+ pb.last_block = -1;
+ retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
+ BLOCK_FLAG_HOLE, 0,
+ process_journal_block, &pb);
+ if ((pb.last_block + 1) * ctx->fs->blocksize <
+ (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
+ retval = EXT2_ET_JOURNAL_TOO_SMALL;
+ goto try_backup_journal;
+ }
+ if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
+ retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
+ &j_inode->i_ext2);
+ if (retval)
+ goto errout;
+ }
+
+ journal->j_total_len = EXT2_I_SIZE(&j_inode->i_ext2) /
+ journal->j_blocksize;
+
+#ifdef USE_INODE_IO
+ retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
+ &j_inode->i_ext2,
+ &journal_name);
+ if (retval)
+ goto errout;
+
+ io_ptr = inode_io_manager;
+#else
+ journal->j_inode = j_inode;
+ ctx->journal_io = ctx->fs->io;
+ if ((ret = jbd2_journal_bmap(journal, 0, &start)) != 0) {
+ retval = (errcode_t) (-1 * ret);
+ goto errout;
+ }
+#endif
+ } else {
+ ext_journal = 1;
+ if (!ctx->journal_name) {
+ char uuid[37];
+
+ uuid_unparse(sb->s_journal_uuid, uuid);
+ ctx->journal_name = blkid_get_devname(ctx->blkid,
+ "UUID", uuid);
+ if (!ctx->journal_name)
+ ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
+ }
+ journal_name = ctx->journal_name;
+
+ if (!journal_name) {
+ fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
+ retval = EXT2_ET_LOAD_EXT_JOURNAL;
+ goto errout;
+ }
+
+ jfs_debug(1, "Using journal file %s\n", journal_name);
+ 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
+ {
+ int flags = IO_FLAG_RW;
+ if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
+ ctx->mount_flags & EXT2_MF_READONLY))
+ flags |= IO_FLAG_EXCLUSIVE;
+ if ((ctx->mount_flags & EXT2_MF_READONLY) &&
+ (ctx->options & E2F_OPT_FORCE))
+ flags &= ~IO_FLAG_EXCLUSIVE;
+
+
+ retval = io_ptr->open(journal_name, flags,
+ &ctx->journal_io);
+ }
+ if (retval)
+ goto errout;
+
+ io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
+
+ if (ext_journal) {
+ blk64_t maxlen;
+
+ start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
+ bh = getblk(dev_journal, start, ctx->fs->blocksize);
+ if (!bh) {
+ retval = EXT2_ET_NO_MEMORY;
+ goto errout;
+ }
+ ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+ if ((retval = bh->b_err) != 0) {
+ brelse(bh);
+ goto errout;
+ }
+ memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET,
+ sizeof(jsuper));
+#ifdef WORDS_BIGENDIAN
+ if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
+ ext2fs_swap_super(&jsuper);
+#endif
+ if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
+ !ext2fs_has_feature_journal_dev(&jsuper)) {
+ fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
+ retval = EXT2_ET_LOAD_EXT_JOURNAL;
+ brelse(bh);
+ 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;
+ brelse(bh);
+ goto errout;
+ }
+
+ /* Check the superblock checksum */
+ if (ext2fs_has_feature_metadata_csum(&jsuper)) {
+ struct struct_ext2_filsys fsx;
+ struct ext2_super_block superx;
+ void *p;
+
+ p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
+ memcpy(&fsx, ctx->fs, sizeof(fsx));
+ memcpy(&superx, ctx->fs->super, sizeof(superx));
+ fsx.super = &superx;
+ ext2fs_set_feature_metadata_csum(fsx.super);
+ if (!ext2fs_superblock_csum_verify(&fsx, p) &&
+ fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
+ &pctx)) {
+ ext2fs_superblock_csum_set(&fsx, p);
+ mark_buffer_dirty(bh);
+ }
+ }
+ brelse(bh);
+
+ maxlen = ext2fs_blocks_count(&jsuper);
+ journal->j_total_len = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
+ 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;
+ if (ext2fs_has_feature_fast_commit(ctx->fs->super))
+ journal->j_fc_replay_callback = ext4_fc_replay;
+ else
+ journal->j_fc_replay_callback = NULL;
+
+#ifdef USE_INODE_IO
+ if (j_inode)
+ ext2fs_free_mem(&j_inode);
+#endif
+
+ *ret_journal = journal;
+ e2fsck_use_inode_shortcuts(ctx, 0);
+ return 0;
+
+errout:
+ e2fsck_use_inode_shortcuts(ctx, 0);
+ 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 = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
+ int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
+
+ 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("*** journal has been deleted ***\n\n");
+ ext2fs_clear_feature_journal(sb);
+ sb->s_journal_inum = 0;
+ memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
+ ctx->flags |= E2F_FLAG_JOURNAL_INODE;
+ ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
+ e2fsck_clear_recover(ctx, 1);
+ return 0;
+ }
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+ } 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;
+
+ ctx->flags |= E2F_FLAG_PROBLEMS_FIXED;
+ 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(REQ_OP_READ, 0, 1, &jbh);
+ if (jbh->b_err) {
+ com_err(ctx->device_name, jbh->b_err, "%s",
+ _("reading journal superblock\n"));
+ return jbh->b_err;
+ }
+
+ jsb = journal->j_superblock;
+ /* If we don't even have JBD2_MAGIC, we probably have a wrong inode */
+ if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER))
+ return e2fsck_journal_fix_bad_inode(ctx, &pctx);
+
+ switch (ntohl(jsb->s_header.h_blocktype)) {
+ case JBD2_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 JBD2_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 JBD2_DESCRIPTOR_BLOCK:
+ case JBD2_COMMIT_BLOCK:
+ case JBD2_REVOKE_BLOCK:
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+
+ /* 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 (JBD2_HAS_INCOMPAT_FEATURE(journal, ~JBD2_KNOWN_INCOMPAT_FEATURES))
+ return EXT2_ET_UNSUPP_FEATURE;
+
+ if (JBD2_HAS_RO_COMPAT_FEATURE(journal, ~JBD2_KNOWN_ROCOMPAT_FEATURES))
+ return EXT2_ET_RO_UNSUPP_FEATURE;
+
+ /* Checksum v1-3 are mutually exclusive features. */
+ if (jbd2_has_feature_csum2(journal) && jbd2_has_feature_csum3(journal))
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+
+ if (jbd2_journal_has_csum_v2or3(journal) &&
+ jbd2_has_feature_checksum(journal))
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+
+ if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
+ !e2fsck_journal_sb_csum_verify(journal, jsb))
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+
+ if (jbd2_journal_has_csum_v2or3(journal))
+ journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
+ sizeof(jsb->s_uuid));
+
+ /* 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_JOURNAL_SB,
+ _("%s: no valid journal superblock found\n"),
+ ctx->device_name);
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+ }
+
+ if (ntohl(jsb->s_maxlen) < journal->j_total_len)
+ journal->j_total_len = ntohl(jsb->s_maxlen);
+ else if (ntohl(jsb->s_maxlen) > journal->j_total_len) {
+ com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
+ _("%s: journal too short\n"),
+ ctx->device_name);
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+ }
+
+ 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);
+ if (jbd2_has_feature_fast_commit(journal)) {
+ if (ntohl(jsb->s_maxlen) - jbd2_journal_get_num_fc_blks(jsb)
+ < JBD2_MIN_JOURNAL_BLOCKS) {
+ com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
+ _("%s: incorrect fast commit blocks\n"),
+ ctx->device_name);
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+ }
+ journal->j_fc_last = ntohl(jsb->s_maxlen);
+ journal->j_last = journal->j_fc_last -
+ jbd2_journal_get_num_fc_blks(jsb);
+ journal->j_fc_first = journal->j_last + 1;
+ } else {
+ 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(JBD2_MAGIC_NUMBER) ||
+ jsb->s_header.h_blocktype != htonl(JBD2_SUPERBLOCK_V1)) {
+ jsb->s_header.h_magic = htonl(JBD2_MAGIC_NUMBER);
+ jsb->s_header.h_blocktype = htonl(JBD2_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_total_len);
+ 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);
+ e2fsck_journal_sb_csum_set(journal, jsb);
+
+ mark_buffer_dirty(journal->j_sb_buffer);
+ ll_rw_block(REQ_OP_WRITE, 0, 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 = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
+
+ if (ext2fs_has_feature_journal(sb)) {
+ 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_JOURNAL_SB;
+ } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
+ return EXT2_ET_CORRUPT_JOURNAL_SB;
+
+ 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_tail_sequence);
+ if (reset)
+ jsb->s_start = 0; /* this marks the journal as empty */
+ e2fsck_journal_sb_csum_set(journal, jsb);
+ 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.
+ */
+errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
+{
+ struct ext2_super_block *sb = ctx->fs->super;
+ journal_t *journal;
+ int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
+ struct problem_context pctx;
+ problem_t problem;
+ int reset = 0, force_fsck = 0;
+ errcode_t retval;
+
+ /* If we don't have any journal features, don't do anything more */
+ if (!ext2fs_has_feature_journal(sb) &&
+ !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_JOURNAL_SB) ||
+ ((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 (!ext2fs_has_feature_journal(sb)) {
+ recover = ext2fs_has_feature_journal_needs_recovery(sb);
+ 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)) {
+ ext2fs_set_feature_journal(sb);
+ ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
+ ext2fs_mark_super_dirty(ctx->fs);
+ }
+ }
+
+ if (ext2fs_has_feature_journal(sb) &&
+ !ext2fs_has_feature_journal_needs_recovery(sb) &&
+ 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;
+ ext2fs_set_feature_journal_needs_recovery(sb);
+ 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?
+ */
+ }
+
+ /*
+ * If we don't need to do replay the journal, check to see if
+ * the journal's errno is set; if so, we need to mark the file
+ * system as being corrupt and clear the journal's s_errno.
+ */
+ if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
+ 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;
+ e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
+ mark_buffer_dirty(journal->j_sb_buffer);
+ }
+
+ e2fsck_journal_release(ctx, journal, reset, 0);
+ return retval;
+}
+
+static errcode_t recover_ext3_journal(e2fsck_t ctx)
+{
+ struct problem_context pctx;
+ journal_t *journal;
+ errcode_t retval;
+
+ clear_problem_context(&pctx);
+
+ retval = jbd2_journal_init_revoke_record_cache();
+ if (retval)
+ return retval;
+
+ retval = jbd2_journal_init_revoke_table_cache();
+ if (retval)
+ return retval;
+
+ retval = e2fsck_get_journal(ctx, &journal);
+ if (retval)
+ return retval;
+
+ retval = e2fsck_journal_load(journal);
+ if (retval)
+ goto errout;
+
+ retval = jbd2_journal_init_revoke(journal, 1024);
+ if (retval)
+ goto errout;
+
+ retval = -jbd2_journal_recover(journal);
+ if (retval)
+ goto errout;
+
+ if (journal->j_failed_commit) {
+ pctx.ino = journal->j_failed_commit;
+ fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
+ journal->j_superblock->s_errno = -EINVAL;
+ mark_buffer_dirty(journal->j_sb_buffer);
+ }
+
+ journal->j_tail_sequence = journal->j_transaction_sequence;
+
+errout:
+ jbd2_journal_destroy_revoke(journal);
+ jbd2_journal_destroy_revoke_record_cache();
+ jbd2_journal_destroy_revoke_table_cache();
+ e2fsck_journal_release(ctx, journal, 1, 0);
+ return retval;
+}
+
+errcode_t 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;
+ io_stats stats = 0;
+ unsigned long long kbytes_written = 0;
+
+ 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.
+ */
+ if (ctx->fs->super->s_kbytes_written &&
+ ctx->fs->io->manager->get_stats)
+ ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
+ if (stats && stats->bytes_written)
+ kbytes_written = stats->bytes_written >> 10;
+
+ ext2fs_mmp_stop(ctx->fs);
+ ext2fs_free(ctx->fs);
+ retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
+ 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;
+ ctx->fs->now = ctx->now;
+ ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
+ ctx->fs->super->s_kbytes_written += kbytes_written;
+
+ /* Set the superblock flags */
+ e2fsck_clear_recover(ctx, recover_retval != 0);
+
+ /*
+ * Do one last sanity check, and propagate journal->s_errno to
+ * the EXT2_ERROR_FS flag in the fs superblock if needed.
+ */
+ retval = e2fsck_check_ext3_journal(ctx);
+ return retval ? retval : 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;
+ dgrp_t group;
+ int 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) ||
+ !ext2fs_has_feature_journal(sb))
+ 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[15] = inode.i_size_high;
+ 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 = ctx->now;
+ if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
+ goto err_out;
+
+ group = ext2fs_group_of_ino(fs, ino);
+ ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
+ ext2fs_mark_ib_dirty(fs);
+ ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
+ ext2fs_group_desc_csum_set(fs, group);
+ 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;
+}
+
+/*
+ * This function makes sure the superblock hint for the external
+ * journal is correct.
+ */
+int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
+{
+ struct ext2_super_block *sb = ctx->fs->super;
+ struct problem_context pctx;
+ char uuid[37], *journal_name;
+ struct stat st;
+
+ if (!ext2fs_has_feature_journal(sb) ||
+ uuid_is_null(sb->s_journal_uuid))
+ return 0;
+
+ uuid_unparse(sb->s_journal_uuid, uuid);
+ journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
+ if (!journal_name)
+ return 0;
+
+ if (stat(journal_name, &st) < 0) {
+ free(journal_name);
+ return 0;
+ }
+
+ if (st.st_rdev != sb->s_journal_dev) {
+ clear_problem_context(&pctx);
+ pctx.num = st.st_rdev;
+ if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
+ sb->s_journal_dev = st.st_rdev;
+ ext2fs_mark_super_dirty(ctx->fs);
+ }
+ }
+
+ free(journal_name);
+ return 0;
+}