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authorJaegeuk Kim <jaegeuk@kernel.org>2015-05-29 04:19:17 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2015-06-02 02:21:09 +0300
commit9236cac5666ea8b3a3b92b132a046c200b99dca8 (patch)
tree76cd720f7405d4ee8042ac86176c1ee2a713ff38 /fs
parente5e0906b6b4c517a8622f2ff196c19cbd1068644 (diff)
downloadlinux-9236cac5666ea8b3a3b92b132a046c200b99dca8.tar.xz
f2fs: fix a deadlock for summary page lock vs. sentry_lock
In f2fs_gc: In f2fs_replace_block: - lock_page(sum_page) - check_valid_map() - mutex_lock(sentry_lock) - mutex_lock(sentry_lock) - change_curseg() - lock_page(sum_page) This patch fixes the deadlock condition. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/f2fs/gc.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 43354cb3ce94..e1e73617d13b 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -750,6 +750,15 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
sum = page_address(sum_page);
+ /*
+ * this is to avoid deadlock:
+ * - lock_page(sum_page) - f2fs_replace_block
+ * - check_valid_map() - mutex_lock(sentry_lock)
+ * - mutex_lock(sentry_lock) - change_curseg()
+ * - lock_page(sum_page)
+ */
+ unlock_page(sum_page);
+
switch (GET_SUM_TYPE((&sum->footer))) {
case SUM_TYPE_NODE:
gc_node_segment(sbi, sum->entries, segno, gc_type);
@@ -763,7 +772,7 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
stat_inc_seg_count(sbi, GET_SUM_TYPE((&sum->footer)), gc_type);
stat_inc_call_count(sbi->stat_info);
- f2fs_put_page(sum_page, 1);
+ f2fs_put_page(sum_page, 0);
}
int f2fs_gc(struct f2fs_sb_info *sbi)