From d2d0395fd1778d4bf714adc5bfd23a5d748d7802 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Thu, 8 Aug 2013 17:34:47 -0400 Subject: 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: Jeff Mahoney --- fs/reiserfs/bitmap.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'fs/reiserfs/bitmap.c') diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c index 881f8ea2a6ac..dc9a6829f7c6 100644 --- a/fs/reiserfs/bitmap.c +++ b/fs/reiserfs/bitmap.c @@ -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; -- cgit v1.2.3