Commit d2d0395f authored by Jeff Mahoney's avatar Jeff Mahoney Committed by Jeff Mahoney
Browse files

reiserfs: locking, release lock around quota operations 



Previous commits released the write lock across quota operations but
missed several places.  In particular, the free operations can also
call into the file system code and take the write lock, causing
deadlocks.

This patch introduces some more helpers and uses them for quota call
sites.  Without this patch applied, reiserfs + quotas runs into deadlocks
under anything more than trivial load.

Signed-off-by: default avatarJeff Mahoney <jeffm@suse.com>
parent 278f6679

fs/reiserfs/bitmap.c

+15 −2
Original line number Diff line number Diff line
@@ -423,8 +423,11 @@ static void _reiserfs_free_block(struct reiserfs_transaction_handle *th, 
	set_sb_free_blocks(rs, sb_free_blocks(rs) + 1);



	journal_mark_dirty(th, s, sbh);

	if (for_unformatted)

	if (for_unformatted) {

		int depth = reiserfs_write_unlock_nested(s);

		dquot_free_block_nodirty(inode, 1);

		reiserfs_write_lock_nested(s, depth);

	}

}



void reiserfs_free_block(struct reiserfs_transaction_handle *th,
@@ -1128,6 +1131,7 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start 
	b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1;

	int passno = 0;

	int nr_allocated = 0;

	int depth;



	determine_prealloc_size(hint);

	if (!hint->formatted_node) {
@@ -1137,10 +1141,13 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start 
			       "reiserquota: allocating %d blocks id=%u",

			       amount_needed, hint->inode->i_uid);

#endif

		depth = reiserfs_write_unlock_nested(s);

		quota_ret =

		    dquot_alloc_block_nodirty(hint->inode, amount_needed);

		if (quota_ret)	/* Quota exceeded? */

		if (quota_ret) {	/* Quota exceeded? */

			reiserfs_write_lock_nested(s, depth);

			return QUOTA_EXCEEDED;

		}

		if (hint->preallocate && hint->prealloc_size) {

#ifdef REISERQUOTA_DEBUG

			reiserfs_debug(s, REISERFS_DEBUG_CODE,
@@ -1153,6 +1160,7 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start 
				hint->preallocate = hint->prealloc_size = 0;

		}

		/* for unformatted nodes, force large allocations */

		reiserfs_write_lock_nested(s, depth);

	}



	do {
@@ -1181,9 +1189,11 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start 
					       hint->inode->i_uid);

#endif

				/* Free not allocated blocks */

				depth = reiserfs_write_unlock_nested(s);

				dquot_free_block_nodirty(hint->inode,

					amount_needed + hint->prealloc_size -

					nr_allocated);

				reiserfs_write_lock_nested(s, depth);

			}

			while (nr_allocated--)

				reiserfs_free_block(hint->th, hint->inode,
@@ -1214,10 +1224,13 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start 
			       REISERFS_I(hint->inode)->i_prealloc_count,

			       hint->inode->i_uid);

#endif



		depth = reiserfs_write_unlock_nested(s);

		dquot_free_block_nodirty(hint->inode, amount_needed +

					 hint->prealloc_size - nr_allocated -

					 REISERFS_I(hint->inode)->

					 i_prealloc_count);

		reiserfs_write_lock_nested(s, depth);

	}



	return CARRY_ON;

fs/reiserfs/inode.c

+11 −8
Original line number Diff line number Diff line
@@ -57,8 +57,11 @@ void reiserfs_evict_inode(struct inode *inode) 
		/* Do quota update inside a transaction for journaled quotas. We must do that

		 * after delete_object so that quota updates go into the same transaction as

		 * stat data deletion */

		if (!err) 

		if (!err) {

			int depth = reiserfs_write_unlock_nested(inode->i_sb);

			dquot_free_inode(inode);

			reiserfs_write_lock_nested(inode->i_sb, depth);

		}



		if (journal_end(&th, inode->i_sb, jbegin_count))

			goto out;
@@ -1768,7 +1771,7 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, 
		       struct inode *inode,

		       struct reiserfs_security_handle *security)

{

	struct super_block *sb;

	struct super_block *sb = dir->i_sb;

	struct reiserfs_iget_args args;

	INITIALIZE_PATH(path_to_key);

	struct cpu_key key;
@@ -1780,9 +1783,9 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, 


	BUG_ON(!th->t_trans_id);



	reiserfs_write_unlock(inode->i_sb);

	depth = reiserfs_write_unlock_nested(sb);

	err = dquot_alloc_inode(inode);

	reiserfs_write_lock(inode->i_sb);

	reiserfs_write_lock_nested(sb, depth);

	if (err)

		goto out_end_trans;

	if (!dir->i_nlink) {
@@ -1790,8 +1793,6 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, 
		goto out_bad_inode;

	}



	sb = dir->i_sb;



	/* item head of new item */

	ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);

	ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
@@ -1983,14 +1984,16 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, 
	INODE_PKEY(inode)->k_objectid = 0;



	/* Quota change must be inside a transaction for journaling */

	depth = reiserfs_write_unlock_nested(inode->i_sb);

	dquot_free_inode(inode);

	reiserfs_write_lock_nested(inode->i_sb, depth);



      out_end_trans:

	journal_end(th, th->t_super, th->t_blocks_allocated);

	reiserfs_write_unlock(inode->i_sb);

	/* Drop can be outside and it needs more credits so it's better to have it outside */

	depth = reiserfs_write_unlock_nested(inode->i_sb);

	dquot_drop(inode);

	reiserfs_write_lock(inode->i_sb);

	reiserfs_write_lock_nested(inode->i_sb, depth);

	inode->i_flags |= S_NOQUOTA;

	make_bad_inode(inode);

fs/reiserfs/stree.c

+23 −5
Original line number Diff line number Diff line
@@ -1186,6 +1186,7 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, 
	struct item_head *q_ih;

	int quota_cut_bytes;

	int ret_value, del_size, removed;

	int depth;



#ifdef CONFIG_REISERFS_CHECK

	char mode;
@@ -1295,7 +1296,9 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, 
		       "reiserquota delete_item(): freeing %u, id=%u type=%c",

		       quota_cut_bytes, inode->i_uid, head2type(&s_ih));

#endif

	depth = reiserfs_write_unlock_nested(inode->i_sb);

	dquot_free_space_nodirty(inode, quota_cut_bytes);

	reiserfs_write_lock_nested(inode->i_sb, depth);



	/* Return deleted body length */

	return ret_value;
@@ -1321,6 +1324,7 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, 
void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,

				struct inode *inode, struct reiserfs_key *key)

{

	struct super_block *sb = th->t_super;

	struct tree_balance tb;

	INITIALIZE_PATH(path);

	int item_len = 0;
@@ -1373,14 +1377,17 @@ void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, 
		if (retval == CARRY_ON) {

			do_balance(&tb, NULL, NULL, M_DELETE);

			if (inode) {	/* Should we count quota for item? (we don't count quotas for save-links) */

				int depth;

#ifdef REISERQUOTA_DEBUG

				reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,

					       "reiserquota delete_solid_item(): freeing %u id=%u type=%c",

					       quota_cut_bytes, inode->i_uid,

					       key2type(key));

#endif

				depth = reiserfs_write_unlock_nested(sb);

				dquot_free_space_nodirty(inode,

							 quota_cut_bytes);

				reiserfs_write_lock_nested(sb, depth);

			}

			break;

		}
@@ -1557,6 +1564,7 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, 
	int retval2 = -1;

	int quota_cut_bytes;

	loff_t tail_pos = 0;

	int depth;



	BUG_ON(!th->t_trans_id);
@@ -1729,7 +1737,9 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, 
		       "reiserquota cut_from_item(): freeing %u id=%u type=%c",

		       quota_cut_bytes, inode->i_uid, '?');

#endif

	depth = reiserfs_write_unlock_nested(sb);

	dquot_free_space_nodirty(inode, quota_cut_bytes);

	reiserfs_write_lock_nested(sb, depth);

	return ret_value;

}
@@ -1949,9 +1959,11 @@ int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct tree 
			     const char *body,	/* Pointer to the bytes to paste.    */

			     int pasted_size)

{				/* Size of pasted bytes.             */

	struct super_block *sb = inode->i_sb;

	struct tree_balance s_paste_balance;

	int retval;

	int fs_gen;

	int depth;



	BUG_ON(!th->t_trans_id);
@@ -1964,9 +1976,9 @@ int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct tree 
		       key2type(&(key->on_disk_key)));

#endif



	reiserfs_write_unlock(inode->i_sb);

	depth = reiserfs_write_unlock_nested(sb);

	retval = dquot_alloc_space_nodirty(inode, pasted_size);

	reiserfs_write_lock(inode->i_sb);

	reiserfs_write_lock_nested(sb, depth);

	if (retval) {

		pathrelse(search_path);

		return retval;
@@ -2023,7 +2035,9 @@ int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct tree 
		       pasted_size, inode->i_uid,

		       key2type(&(key->on_disk_key)));

#endif

	depth = reiserfs_write_unlock_nested(sb);

	dquot_free_space_nodirty(inode, pasted_size);

	reiserfs_write_lock_nested(sb, depth);

	return retval;

}
@@ -2046,6 +2060,7 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, 
	BUG_ON(!th->t_trans_id);



	if (inode) {		/* Do we count quotas for item? */

		int depth;

		fs_gen = get_generation(inode->i_sb);

		quota_bytes = ih_item_len(ih);
@@ -2059,11 +2074,11 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, 
			       "reiserquota insert_item(): allocating %u id=%u type=%c",

			       quota_bytes, inode->i_uid, head2type(ih));

#endif

		reiserfs_write_unlock(inode->i_sb);

		/* We can't dirty inode here. It would be immediately written but

		 * appropriate stat item isn't inserted yet... */

		depth = reiserfs_write_unlock_nested(inode->i_sb);

		retval = dquot_alloc_space_nodirty(inode, quota_bytes);

		reiserfs_write_lock(inode->i_sb);

		reiserfs_write_lock_nested(inode->i_sb, depth);

		if (retval) {

			pathrelse(path);

			return retval;
@@ -2114,7 +2129,10 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, 
		       "reiserquota insert_item(): freeing %u id=%u type=%c",

		       quota_bytes, inode->i_uid, head2type(ih));

#endif

	if (inode)

	if (inode) {

		int depth = reiserfs_write_unlock_nested(inode->i_sb);

		dquot_free_space_nodirty(inode, quota_bytes);

		reiserfs_write_lock_nested(inode->i_sb, depth);

	}

	return retval;

}

fs/reiserfs/super.c

+14 −8
Original line number Diff line number Diff line
@@ -243,6 +243,7 @@ static int finish_unfinished(struct super_block *s) 
	done = 0;

	REISERFS_SB(s)->s_is_unlinked_ok = 1;

	while (!retval) {

		int depth;

		retval = search_item(s, &max_cpu_key, &path);

		if (retval != ITEM_NOT_FOUND) {

			reiserfs_error(s, "vs-2140",
@@ -298,9 +299,9 @@ static int finish_unfinished(struct super_block *s) 
			retval = remove_save_link_only(s, &save_link_key, 0);

			continue;

		}

		reiserfs_write_unlock(s);

		depth = reiserfs_write_unlock_nested(inode->i_sb);

		dquot_initialize(inode);

		reiserfs_write_lock(s);

		reiserfs_write_lock_nested(inode->i_sb, depth);



		if (truncate && S_ISDIR(inode->i_mode)) {

			/* We got a truncate request for a dir which is impossible.
@@ -356,10 +357,12 @@ static int finish_unfinished(struct super_block *s) 


#ifdef CONFIG_QUOTA

	/* Turn quotas off */

	reiserfs_write_unlock(s);

	for (i = 0; i < MAXQUOTAS; i++) {

		if (sb_dqopt(s)->files[i] && quota_enabled[i])

			dquot_quota_off(s, i);

	}

	reiserfs_write_lock(s);

	if (ms_active_set)

		/* Restore the flag back */

		s->s_flags &= ~MS_ACTIVE;
@@ -2098,6 +2101,7 @@ static int reiserfs_write_dquot(struct dquot *dquot) 
{

	struct reiserfs_transaction_handle th;

	int ret, err;

	int depth;



	reiserfs_write_lock(dquot->dq_sb);

	ret =
@@ -2105,9 +2109,9 @@ static int reiserfs_write_dquot(struct dquot *dquot) 
			  REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));

	if (ret)

		goto out;

	reiserfs_write_unlock(dquot->dq_sb);

	depth = reiserfs_write_unlock_nested(dquot->dq_sb);

	ret = dquot_commit(dquot);

	reiserfs_write_lock(dquot->dq_sb);

	reiserfs_write_lock_nested(dquot->dq_sb, depth);

	err =

	    journal_end(&th, dquot->dq_sb,

			REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
@@ -2122,6 +2126,7 @@ static int reiserfs_acquire_dquot(struct dquot *dquot) 
{

	struct reiserfs_transaction_handle th;

	int ret, err;

	int depth;



	reiserfs_write_lock(dquot->dq_sb);

	ret =
@@ -2129,9 +2134,9 @@ static int reiserfs_acquire_dquot(struct dquot *dquot) 
			  REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));

	if (ret)

		goto out;

	reiserfs_write_unlock(dquot->dq_sb);

	depth = reiserfs_write_unlock_nested(dquot->dq_sb);

	ret = dquot_acquire(dquot);

	reiserfs_write_lock(dquot->dq_sb);

	reiserfs_write_lock_nested(dquot->dq_sb, depth);

	err =

	    journal_end(&th, dquot->dq_sb,

			REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
@@ -2184,15 +2189,16 @@ static int reiserfs_write_info(struct super_block *sb, int type) 
{

	struct reiserfs_transaction_handle th;

	int ret, err;

	int depth;



	/* Data block + inode block */

	reiserfs_write_lock(sb);

	ret = journal_begin(&th, sb, 2);

	if (ret)

		goto out;

	reiserfs_write_unlock(sb);

	depth = reiserfs_write_unlock_nested(sb);

	ret = dquot_commit_info(sb, type);

	reiserfs_write_lock(sb);

	reiserfs_write_lock_nested(sb, depth);

	err = journal_end(&th, sb, 2);

	if (!ret && err)

		ret = err;

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