int journal_wipe(journal_t *journal, int write)
{
journal_superblock_t *sb;
int err = 0;
J_ASSERT (!(journal->j_flags & JFS_LOADED));
err = load_superblock(journal);
if (err)
return err;
sb = journal->j_superblock;
if (!journal->j_tail)
goto no_recovery;
printk (KERN_WARNING "JBD: %s recovery information on journal\n",
write ? "Clearing" : "Ignoring");
err = journal_skip_recovery(journal);
if (write)
journal_update_superblock(journal, 1);
no_recovery:
return err;
}
void ext2_init_fs()
{
load_superblock();
load_bgdt();
// Read the root inode, just for fun
Ext2_inode root_inode;
read_inode(&root_inode, ROOT_INODE);
term_printf(" / creation time = %d\n", root_inode.creation_time);
term_printf(" / uid = %d\n", root_inode.uid);
term_printf(" / type & perms = 0x%X\n", root_inode.type_and_permissions);
term_printf(" / size = %d\n", root_inode.size);
// Enumerate the files in it
term_puts(" / files:");
Ext2_file file;
ext2_open_inode(ROOT_INODE, &file);
Ext2_dirent dirent;
while (ext2_next_dirent(&file, &dirent)) {
term_printf(" inode %d, name `%s'\n", dirent.inode_num, dirent.name);
}
kfree(file.buf);
// Look for a file
term_putsn(" looking for file `/bar/baz/quux'...");
uint32_t inode = ext2_look_up_path("/bar/baz/quux");
if (inode == 0)
term_puts(" not found");
else
term_printf(" found: inode = %d\n", inode);
}
/**
* int journal_load() - Read journal from disk.
* @journal: Journal to act on.
*
* Given a journal_t structure which tells us which disk blocks contain
* a journal, read the journal from disk to initialise the in-memory
* structures.
*/
int journal_load(journal_t *journal)
{
int err;
journal_superblock_t *sb;
err = load_superblock(journal);
if (err)
return err;
sb = journal->j_superblock;
/* If this is a V2 superblock, then we have to check the
* features flags on it. */
if (journal->j_format_version >= 2) {
if ((sb->s_feature_ro_compat &
~cpu_to_be32(JFS_KNOWN_ROCOMPAT_FEATURES)) ||
(sb->s_feature_incompat &
~cpu_to_be32(JFS_KNOWN_INCOMPAT_FEATURES))) {
printk (KERN_WARNING
"JBD: Unrecognised features on journal\n");
return -EINVAL;
}
}
/* Let the recovery code check whether it needs to recover any
* data from the journal. */
if (journal_recover(journal))
goto recovery_error;
/* OK, we've finished with the dynamic journal bits:
* reinitialise the dynamic contents of the superblock in memory
* and reset them on disk. */
if (journal_reset(journal))
goto recovery_error;
journal->j_flags &= ~JFS_ABORT;
journal->j_flags |= JFS_LOADED;
return 0;
recovery_error:
printk (KERN_WARNING "JBD: recovery failed\n");
return -EIO;
}
