diff options
| author | Ritesh Harjani <riteshh@codeaurora.org> | 2018-03-16 18:53:53 +0530 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-03-18 23:31:28 -0700 |
| commit | 02117b8ae9c0549500119c42375f9e15602bf47e (patch) | |
| tree | 9ddd55ac7772dcbcd107b64e28dad4e92c193b5d /fs/f2fs/super.c | |
| parent | ff62af200b94e06b1430eac6e58f5f26d13c749d (diff) | |
f2fs: Set GF_NOFS in read_cache_page_gfp while doing f2fs_quota_read
Quota code itself is serializing the operations by taking mutex_lock.
It seems a below deadlock can happen if GF_NOFS is not used in
f2fs_quota_read
__switch_to+0x88
__schedule+0x5b0
schedule+0x78
schedule_preempt_disabled+0x20
__mutex_lock_slowpath+0xdc //mutex owner is itself
mutex_lock+0x2c
dquot_commit+0x30 //mutex_lock(&dqopt->dqio_mutex);
dqput+0xe0
__dquot_drop+0x80
dquot_drop+0x48
f2fs_evict_inode+0x218
evict+0xa8
dispose_list+0x3c
prune_icache_sb+0x58
super_cache_scan+0xf4
do_shrink_slab+0x208
shrink_slab.part.40+0xac
shrink_zone+0x1b0
do_try_to_free_pages+0x25c
try_to_free_pages+0x164
__alloc_pages_nodemask+0x534
do_read_cache_page+0x6c
read_cache_page+0x14
f2fs_quota_read+0xa4
read_blk+0x54
find_tree_dqentry+0xe4
find_tree_dqentry+0xb8
find_tree_dqentry+0xb8
find_tree_dqentry+0xb8
qtree_read_dquot+0x68
v2_read_dquot+0x24
dquot_acquire+0x5c // mutex_lock(&dqopt->dqio_mutex);
dqget+0x238
__dquot_initialize+0xd4
dquot_initialize+0x10
dquot_file_open+0x34
f2fs_file_open+0x6c
do_dentry_open+0x1e4
vfs_open+0x6c
path_openat+0xa20
do_filp_open+0x4c
do_sys_open+0x178
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/super.c')
| -rw-r--r-- | fs/f2fs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 98b2c7ff1804..0c1fe9b87502 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1572,7 +1572,7 @@ static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data, while (toread > 0) { tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread); repeat: - page = read_mapping_page(mapping, blkidx, NULL); + page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS); if (IS_ERR(page)) { if (PTR_ERR(page) == -ENOMEM) { congestion_wait(BLK_RW_ASYNC, HZ/50); |