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-rw-r--r--fs/btrfs/super.c40
1 files changed, 37 insertions, 3 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 022f20810089..12d7d3be7cd4 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -175,7 +175,7 @@ void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function
btrfs_discard_stop(fs_info);
/* btrfs handle error by forcing the filesystem readonly */
- sb->s_flags |= SB_RDONLY;
+ btrfs_set_sb_rdonly(sb);
btrfs_info(fs_info, "forced readonly");
/*
* Note that a running device replace operation is not canceled here
@@ -1953,7 +1953,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
/* avoid complains from lockdep et al. */
up(&fs_info->uuid_tree_rescan_sem);
- sb->s_flags |= SB_RDONLY;
+ btrfs_set_sb_rdonly(sb);
/*
* Setting SB_RDONLY will put the cleaner thread to
@@ -1964,10 +1964,42 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
*/
btrfs_delete_unused_bgs(fs_info);
+ /*
+ * The cleaner task could be already running before we set the
+ * flag BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock).
+ * We must make sure that after we finish the remount, i.e. after
+ * we call btrfs_commit_super(), the cleaner can no longer start
+ * a transaction - either because it was dropping a dead root,
+ * running delayed iputs or deleting an unused block group (the
+ * cleaner picked a block group from the list of unused block
+ * groups before we were able to in the previous call to
+ * btrfs_delete_unused_bgs()).
+ */
+ wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING,
+ TASK_UNINTERRUPTIBLE);
+
+ /*
+ * We've set the superblock to RO mode, so we might have made
+ * the cleaner task sleep without running all pending delayed
+ * iputs. Go through all the delayed iputs here, so that if an
+ * unmount happens without remounting RW we don't end up at
+ * finishing close_ctree() with a non-empty list of delayed
+ * iputs.
+ */
+ btrfs_run_delayed_iputs(fs_info);
+
btrfs_dev_replace_suspend_for_unmount(fs_info);
btrfs_scrub_cancel(fs_info);
btrfs_pause_balance(fs_info);
+ /*
+ * Pause the qgroup rescan worker if it is running. We don't want
+ * it to be still running after we are in RO mode, as after that,
+ * by the time we unmount, it might have left a transaction open,
+ * so we would leak the transaction and/or crash.
+ */
+ btrfs_qgroup_wait_for_completion(fs_info, false);
+
ret = btrfs_commit_super(fs_info);
if (ret)
goto restore;
@@ -2006,7 +2038,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
if (ret)
goto restore;
- sb->s_flags &= ~SB_RDONLY;
+ btrfs_clear_sb_rdonly(sb);
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
}
@@ -2028,6 +2060,8 @@ restore:
/* We've hit an error - don't reset SB_RDONLY */
if (sb_rdonly(sb))
old_flags |= SB_RDONLY;
+ if (!(old_flags & SB_RDONLY))
+ clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
sb->s_flags = old_flags;
fs_info->mount_opt = old_opts;
fs_info->compress_type = old_compress_type;