path: root/fs/nilfs2/segment.c
diff options
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-01-31 19:46:40 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-02-13 12:26:03 +0900
commitfe5f171bb272946ce5fbf843ce2f8467d0d41b9a (patch)
treefc3917cd7b3fae605e464f94af815dc9d9cce36f /fs/nilfs2/segment.c
parent7512487e6d6459e4c3f9c7cedc53050a6c30e387 (diff)
nilfs2: fix potential hang in nilfs_error on errors=remount-ro
nilfs_error() calls nilfs_detach_segment_constructor() if errors=remount-ro option is specified, and this may lead to a hang due to recursive locking of, for instance, nilfs->ns_segctor_sem and others. In this case, detaching segment constructor is not necessary because read-only flag is set to the filesystem and further writes are blocked. This fixes the potential hang issue by removing the nilfs_detach_segment_constructor() call from nilfs_error. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/segment.c')
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 9280b0f10792..ab439a7ef2d8 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2875,8 +2875,15 @@ int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
- /* Each field of nilfs_segctor is cleared through the initialization
- of super-block info */
+ if (NILFS_SC(sbi)) {
+ /*
+ * This happens if the filesystem was remounted
+ * read/write after nilfs_error degenerated it into a
+ * read-only mount.
+ */
+ nilfs_detach_segment_constructor(sbi);
+ }
sbi->s_sc_info = nilfs_segctor_new(sbi);
if (!sbi->s_sc_info)
return -ENOMEM;