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authorJan Kara <jack@suse.cz>2008-08-18 07:40:18 -0400
committerJan Kara <jack@suse.cz>2008-08-19 05:04:36 -0400
commitdb0badc58e948b810c7a75cfcc48845e2949ee37 (patch)
treec6070b1d9ef4989bf1d73eecf9560c78980bab84 /fs/udf
parentb635acec48bcaa9183fcbf4e3955616b0d4119b5 (diff)
udf: Fix lock inversion between iprune_mutex and alloc_mutex (v2)
A memory allocation inside alloc_mutex must not recurse back into the filesystem itself because that leads to lock inversion between iprune_mutex and alloc_mutex (and thus to deadlocks - see traces below). alloc_mutex is actually needed only to update allocation statistics in the superblock so we can drop it before we start allocating memory for the inode. tar D ffff81015b9c8c90 0 6614 6612 ffff8100d5a21a20 0000000000000086 0000000000000000 00000000ffff0000 ffff81015b9c8c90 ffff81015b8f0cd0 ffff81015b9c8ee0 0000000000000000 0000000000000003 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<ffffffff803c1d8a>] __mutex_lock_slowpath+0x64/0x9b [<ffffffff803c1bef>] mutex_lock+0xa/0xb [<ffffffff8027f8c2>] shrink_icache_memory+0x38/0x200 [<ffffffff80257742>] shrink_slab+0xe3/0x15b [<ffffffff802579db>] try_to_free_pages+0x221/0x30d [<ffffffff8025657e>] isolate_pages_global+0x0/0x31 [<ffffffff8025324b>] __alloc_pages_internal+0x252/0x3ab [<ffffffff8026b08b>] cache_alloc_refill+0x22e/0x47b [<ffffffff8026ae37>] kmem_cache_alloc+0x3b/0x61 [<ffffffff8026b15b>] cache_alloc_refill+0x2fe/0x47b [<ffffffff8026b34e>] __kmalloc+0x76/0x9c [<ffffffffa00751f2>] :udf:udf_new_inode+0x202/0x2e2 [<ffffffffa007ae5e>] :udf:udf_create+0x2f/0x16d [<ffffffffa0078f27>] :udf:udf_lookup+0xa6/0xad ... kswapd0 D ffff81015b9d9270 0 125 2 ffff81015b903c28 0000000000000046 ffffffff8028cbb0 00000000fffffffb ffff81015b9d9270 ffff81015b8f0cd0 ffff81015b9d94c0 000000000271b490 ffffe2000271b458 ffffe2000271b420 ffffe20002728dc8 ffffe20002728d90 Call Trace: [<ffffffff8028cbb0>] __set_page_dirty+0xeb/0xf5 [<ffffffff8025403a>] get_dirty_limits+0x1d/0x22f [<ffffffff803c1d8a>] __mutex_lock_slowpath+0x64/0x9b [<ffffffff803c1bef>] mutex_lock+0xa/0xb [<ffffffffa0073f58>] :udf:udf_bitmap_free_blocks+0x47/0x1eb [<ffffffffa007df31>] :udf:udf_discard_prealloc+0xc6/0x172 [<ffffffffa007875a>] :udf:udf_clear_inode+0x1e/0x48 [<ffffffff8027f121>] clear_inode+0x6d/0xc4 [<ffffffff8027f7f2>] dispose_list+0x56/0xee [<ffffffff8027fa5a>] shrink_icache_memory+0x1d0/0x200 [<ffffffff80257742>] shrink_slab+0xe3/0x15b [<ffffffff80257e93>] kswapd+0x346/0x447 ... Reported-by: Tibor Tajti <tibor.tajti@gmail.com> Reviewed-by: Ingo Oeser <ioe-lkml@rameria.de> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf')
-rw-r--r--fs/udf/ialloc.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index eb9cfa23dc3d..c4943c8988c2 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -111,6 +111,7 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
111 lvhd->uniqueID = cpu_to_le64(uniqueID); 111 lvhd->uniqueID = cpu_to_le64(uniqueID);
112 mark_buffer_dirty(sbi->s_lvid_bh); 112 mark_buffer_dirty(sbi->s_lvid_bh);
113 } 113 }
114 mutex_unlock(&sbi->s_alloc_mutex);
114 inode->i_mode = mode; 115 inode->i_mode = mode;
115 inode->i_uid = current->fsuid; 116 inode->i_uid = current->fsuid;
116 if (dir->i_mode & S_ISGID) { 117 if (dir->i_mode & S_ISGID) {
@@ -145,7 +146,6 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
145 if (!iinfo->i_ext.i_data) { 146 if (!iinfo->i_ext.i_data) {
146 iput(inode); 147 iput(inode);
147 *err = -ENOMEM; 148 *err = -ENOMEM;
148 mutex_unlock(&sbi->s_alloc_mutex);
149 return NULL; 149 return NULL;
150 } 150 }
151 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB)) 151 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
@@ -158,7 +158,6 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err)
158 iinfo->i_crtime = current_fs_time(inode->i_sb); 158 iinfo->i_crtime = current_fs_time(inode->i_sb);
159 insert_inode_hash(inode); 159 insert_inode_hash(inode);
160 mark_inode_dirty(inode); 160 mark_inode_dirty(inode);
161 mutex_unlock(&sbi->s_alloc_mutex);
162 161
163 if (DQUOT_ALLOC_INODE(inode)) { 162 if (DQUOT_ALLOC_INODE(inode)) {
164 DQUOT_DROP(inode); 163 DQUOT_DROP(inode);