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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-01-31 19:46:40 +0900 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-02-13 12:26:03 +0900 |
| commit | fe5f171bb272946ce5fbf843ce2f8467d0d41b9a (patch) | |
| tree | fc3917cd7b3fae605e464f94af815dc9d9cce36f /fs/nilfs2/segment.c | |
| parent | 7512487e6d6459e4c3f9c7cedc53050a6c30e387 (diff) | |
| download | lwn-fe5f171bb272946ce5fbf843ce2f8467d0d41b9a.tar.gz lwn-fe5f171bb272946ce5fbf843ce2f8467d0d41b9a.zip | |
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')
| -rw-r--r-- | fs/nilfs2/segment.c | 11 |
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; |