Commit 37c69b98 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Linus Torvalds
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reiserfs: don't lock journal_init() 



journal_init() doesn't need the lock since no operation on the filesystem
is involved there.  journal_read() and get_list_bitmap() have yet to be
reviewed carefully though before removing the lock there.  Just keep the
it around these two calls for safety.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f32485be

fs/reiserfs/journal.c

+20 −33
Original line number Diff line number Diff line
@@ -2678,16 +2678,10 @@ int journal_init(struct super_block *sb, const char *j_dev_name, 
	char b[BDEVNAME_SIZE];

	int ret;



	/*

	 * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS

	 * dependency inversion warnings.

	 */

	reiserfs_write_unlock(sb);

	journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));

	if (!journal) {

		reiserfs_warning(sb, "journal-1256",

				 "unable to get memory for journal structure");

		reiserfs_write_lock(sb);

		return 1;

	}

	INIT_LIST_HEAD(&journal->j_bitmap_nodes);
@@ -2695,10 +2689,8 @@ int journal_init(struct super_block *sb, const char *j_dev_name, 
	INIT_LIST_HEAD(&journal->j_working_list);

	INIT_LIST_HEAD(&journal->j_journal_list);

	journal->j_persistent_trans = 0;

	ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,

					   reiserfs_bmap_count(sb));

	reiserfs_write_lock(sb);

	if (ret)

	if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,

					   reiserfs_bmap_count(sb)))

		goto free_and_return;



	allocate_bitmap_nodes(sb);
@@ -2727,27 +2719,11 @@ int journal_init(struct super_block *sb, const char *j_dev_name, 
		goto free_and_return;

	}



	/*

	 * We need to unlock here to avoid creating the following

	 * dependency:

	 * reiserfs_lock -> sysfs_mutex

	 * Because the reiserfs mmap path creates the following dependency:

	 * mm->mmap -> reiserfs_lock, hence we have

	 * mm->mmap -> reiserfs_lock ->sysfs_mutex

	 * This would ends up in a circular dependency with sysfs readdir path

	 * which does sysfs_mutex -> mm->mmap_sem

	 * This is fine because the reiserfs lock is useless in mount path,

	 * at least until we call journal_begin. We keep it for paranoid

	 * reasons.

	 */

	reiserfs_write_unlock(sb);

	if (journal_init_dev(sb, journal, j_dev_name) != 0) {

		reiserfs_write_lock(sb);

		reiserfs_warning(sb, "sh-462",

				 "unable to initialize jornal device");

		goto free_and_return;

	}

	reiserfs_write_lock(sb);



	rs = SB_DISK_SUPER_BLOCK(sb);
@@ -2829,9 +2805,7 @@ int journal_init(struct super_block *sb, const char *j_dev_name, 
	journal->j_mount_id = 10;

	journal->j_state = 0;

	atomic_set(&(journal->j_jlock), 0);

	reiserfs_write_unlock(sb);

	journal->j_cnode_free_list = allocate_cnodes(num_cnodes);

	reiserfs_write_lock(sb);

	journal->j_cnode_free_orig = journal->j_cnode_free_list;

	journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;

	journal->j_cnode_used = 0;
@@ -2848,24 +2822,37 @@ int journal_init(struct super_block *sb, const char *j_dev_name, 


	init_journal_hash(sb);

	jl = journal->j_current_jl;



	/*

	 * get_list_bitmap() may call flush_commit_list() which

	 * requires the lock. Calling flush_commit_list() shouldn't happen

	 * this early but I like to be paranoid.

	 */

	reiserfs_write_lock(sb);

	jl->j_list_bitmap = get_list_bitmap(sb, jl);

	reiserfs_write_unlock(sb);

	if (!jl->j_list_bitmap) {

		reiserfs_warning(sb, "journal-2005",

				 "get_list_bitmap failed for journal list 0");

		goto free_and_return;

	}

	if (journal_read(sb) < 0) {



	/*

	 * Journal_read needs to be inspected in order to push down

	 * the lock further inside (or even remove it).

	 */

	reiserfs_write_lock(sb);

	ret = journal_read(sb);

	reiserfs_write_unlock(sb);

	if (ret < 0) {

		reiserfs_warning(sb, "reiserfs-2006",

				 "Replay Failure, unable to mount");

		goto free_and_return;

	}



	reiserfs_mounted_fs_count++;

	if (reiserfs_mounted_fs_count <= 1) {

		reiserfs_write_unlock(sb);

	if (reiserfs_mounted_fs_count <= 1)

		commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);

		reiserfs_write_lock(sb);

	}



	INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);

	journal->j_work_sb = sb;

fs/reiserfs/super.c

+11 −10
Original line number Diff line number Diff line
@@ -1826,6 +1826,17 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 
		printk("reiserfs: using flush barriers\n");

	}



	// set_device_ro(s->s_dev, 1) ;

	if (journal_init(s, jdev_name, old_format, commit_max_age)) {

		SWARN(silent, s, "sh-2022",

		      "unable to initialize journal space");

		goto error_unlocked;

	} else {

		jinit_done = 1;	/* once this is set, journal_release must be called

				 ** if we error out of the mount

				 */

	}



	/*

	 * This path assumed to be called with the BKL in the old times.

	 * Now we have inherited the big reiserfs lock from it and many
@@ -1836,16 +1847,6 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 
	 */

	reiserfs_write_lock(s);



	// set_device_ro(s->s_dev, 1) ;

	if (journal_init(s, jdev_name, old_format, commit_max_age)) {

		SWARN(silent, s, "sh-2022",

		      "unable to initialize journal space");

		goto error;

	} else {

		jinit_done = 1;	/* once this is set, journal_release must be called

				 ** if we error out of the mount

				 */

	}

	if (reread_meta_blocks(s)) {

		SWARN(silent, s, "jmacd-9",

		      "unable to reread meta blocks after journal init");

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