-/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
- * the superblock) which were deleted from all directories, but held open by
- * a process at the time of a crash. We walk the list and try to delete these
- * inodes at recovery time (only with a read-write filesystem).
- *
- * In order to keep the orphan inode chain consistent during traversal (in
- * case of crash during recovery), we link each inode into the superblock
- * orphan list_head and handle it the same way as an inode deletion during
- * normal operation (which journals the operations for us).
- *
- * We only do an iget() and an iput() on each inode, which is very safe if we
- * accidentally point at an in-use or already deleted inode. The worst that
- * can happen in this case is that we get a "bit already cleared" message from
- * ext4_free_inode(). The only reason we would point at a wrong inode is if
- * e2fsck was run on this filesystem, and it must have already done the orphan
- * inode cleanup for us, so we can safely abort without any further action.
- */
-static void ext4_orphan_cleanup(struct super_block *sb,
- struct ext4_super_block *es)
-{
- unsigned int s_flags = sb->s_flags;
- int ret, nr_orphans = 0, nr_truncates = 0;
-#ifdef CONFIG_QUOTA
- int quota_update = 0;
- int i;
-#endif
- if (!es->s_last_orphan) {
- jbd_debug(4, "no orphan inodes to clean up\n");
- return;
- }
-
- if (bdev_read_only(sb->s_bdev)) {
- ext4_msg(sb, KERN_ERR, "write access "
- "unavailable, skipping orphan cleanup");
- return;
- }
-
- /* Check if feature set would not allow a r/w mount */
- if (!ext4_feature_set_ok(sb, 0)) {
- ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
- "unknown ROCOMPAT features");
- return;
- }
-
- if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
- /* don't clear list on RO mount w/ errors */
- if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
- ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
- "clearing orphan list.\n");
- es->s_last_orphan = 0;
- }
- jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
- return;
- }
-
- if (s_flags & SB_RDONLY) {
- ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
- sb->s_flags &= ~SB_RDONLY;
- }
-#ifdef CONFIG_QUOTA
- /*
- * Turn on quotas which were not enabled for read-only mounts if
- * filesystem has quota feature, so that they are updated correctly.
- */
- if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
- int ret = ext4_enable_quotas(sb);
-
- if (!ret)
- quota_update = 1;
- else
- ext4_msg(sb, KERN_ERR,
- "Cannot turn on quotas: error %d", ret);
- }
-
- /* Turn on journaled quotas used for old sytle */
- for (i = 0; i < EXT4_MAXQUOTAS; i++) {
- if (EXT4_SB(sb)->s_qf_names[i]) {
- int ret = ext4_quota_on_mount(sb, i);
-
- if (!ret)
- quota_update = 1;
- else
- ext4_msg(sb, KERN_ERR,
- "Cannot turn on journaled "
- "quota: type %d: error %d", i, ret);
- }
- }
-#endif
-
- while (es->s_last_orphan) {
- struct inode *inode;
-
- /*
- * We may have encountered an error during cleanup; if
- * so, skip the rest.
- */
- if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
- jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
- es->s_last_orphan = 0;
- break;
- }
-
- inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
- if (IS_ERR(inode)) {
- es->s_last_orphan = 0;
- break;
- }
-
- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
- dquot_initialize(inode);
- if (inode->i_nlink) {
- if (test_opt(sb, DEBUG))
- ext4_msg(sb, KERN_DEBUG,
- "%s: truncating inode %lu to %lld bytes",
- __func__, inode->i_ino, inode->i_size);
- jbd_debug(2, "truncating inode %lu to %lld bytes\n",
- inode->i_ino, inode->i_size);
- inode_lock(inode);
- truncate_inode_pages(inode->i_mapping, inode->i_size);
- ret = ext4_truncate(inode);
- if (ret) {
- /*
- * We need to clean up the in-core orphan list
- * manually if ext4_truncate() failed to get a
- * transaction handle.
- */
- ext4_orphan_del(NULL, inode);
- ext4_std_error(inode->i_sb, ret);
- }
- inode_unlock(inode);
- nr_truncates++;
- } else {
- if (test_opt(sb, DEBUG))
- ext4_msg(sb, KERN_DEBUG,
- "%s: deleting unreferenced inode %lu",
- __func__, inode->i_ino);
- jbd_debug(2, "deleting unreferenced inode %lu\n",
- inode->i_ino);
- nr_orphans++;
- }
- iput(inode); /* The delete magic happens here! */
- }
-
-#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
-
- if (nr_orphans)
- ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
- PLURAL(nr_orphans));
- if (nr_truncates)
- ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
- PLURAL(nr_truncates));
-#ifdef CONFIG_QUOTA
- /* Turn off quotas if they were enabled for orphan cleanup */
- if (quota_update) {
- for (i = 0; i < EXT4_MAXQUOTAS; i++) {
- if (sb_dqopt(sb)->files[i])
- dquot_quota_off(sb, i);
- }
- }
-#endif
- sb->s_flags = s_flags; /* Restore SB_RDONLY status */
-}
-