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hfsplus: avoid deadlock on file truncation 

After an extent is removed from the extent tree, the corresponding bits
are also cleared from the block allocation file.  This is currently done
without releasing the tree lock.

The problem is that the allocation file has extents of its own; if it is
fragmented enough, some of them may be in the extent tree as well, and
hfsplus_get_block() will try to take the lock again.

To avoid deadlock, only hold the extent tree lock during the actual tree
operations.

Link: http://lkml.kernel.org/r/20180709202549.auxwkb6memlegb4a@eaf
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Cc: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ernesto A. Fernández 2018-08-21 21:59:16 -07:00 committed by Linus Torvalds
parent 7464726cb5
commit 31651c6071
1 changed files with 14 additions and 4 deletions
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18
fs/hfsplus/extents.c
View File

@ -336,6 +336,9 @@ static int hfsplus_free_extents(struct super_block *sb,
int i;
int err = 0;
/* Mapping the allocation file may lock the extent tree */
WARN_ON(mutex_is_locked(&HFSPLUS_SB(sb)->ext_tree->tree_lock));
hfsplus_dump_extent(extent);
for (i = 0; i < 8; extent++, i++) {
count = be32_to_cpu(extent->block_count);
@ -415,11 +418,13 @@ int hfsplus_free_fork(struct super_block *sb, u32 cnid,
if (res)
break;
start = be32_to_cpu(fd.key->ext.start_block);
hfsplus_free_extents(sb, ext_entry,
total_blocks - start,
total_blocks);
hfs_brec_remove(&fd);
mutex_unlock(&fd.tree->tree_lock);
hfsplus_free_extents(sb, ext_entry, total_blocks - start,
total_blocks);
total_blocks = start;
mutex_lock(&fd.tree->tree_lock);
} while (total_blocks > blocks);
hfs_find_exit(&fd);
@ -576,15 +581,20 @@ void hfsplus_file_truncate(struct inode *inode)
}
while (1) {
if (alloc_cnt == hip->first_blocks) {
mutex_unlock(&fd.tree->tree_lock);
hfsplus_free_extents(sb, hip->first_extents,
alloc_cnt, alloc_cnt - blk_cnt);
hfsplus_dump_extent(hip->first_extents);
hip->first_blocks = blk_cnt;
mutex_lock(&fd.tree->tree_lock);
break;
}
res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
if (res)
break;
hfs_brec_remove(&fd);
mutex_unlock(&fd.tree->tree_lock);
start = hip->cached_start;
hfsplus_free_extents(sb, hip->cached_extents,
alloc_cnt - start, alloc_cnt - blk_cnt);
@ -596,7 +606,7 @@ void hfsplus_file_truncate(struct inode *inode)
alloc_cnt = start;
hip->cached_start = hip->cached_blocks = 0;
hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
hfs_brec_remove(&fd);
mutex_lock(&fd.tree->tree_lock);
}
hfs_find_exit(&fd);