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f2fs: avoid f2fs_lock_op for IPU writes

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Currently, if we do get_node_of_data before f2fs_lock_op, there may be dead lock
as follows, where process A would be in infinite loop, and B will NOT be awaked.

Process A(cp):            Process B:
f2fs_lock_all(sbi)
                        get_dnode_of_data <---- lock dn.node_page
flush_nodes             f2fs_lock_op

So, this patch adds f2fs_trylock_op to avoid f2fs_lock_op done by IPU.

Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2017-05-12 13:51:34 -07:00
parent a912b54d3a
commit cc15620bc8
4 changed files with 45 additions and 16 deletions
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2
fs/f2fs/segment.c
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@@ -312,7 +312,7 @@ static int __commit_inmem_pages(struct inode *inode,
fio.page = page;
fio.old_blkaddr = NULL_ADDR;
fio.encrypted_page = NULL;
fio.need_lock = false,
fio.need_lock = LOCK_DONE;
err = do_write_data_page(&fio);
if (err) {
unlock_page(page);