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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-08-10 11:58:57 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-08-24 15:51:00 -0400 |
| commit | 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 (patch) | |
| tree | 1716c3caf8c5d6c10aa139bdbb75d93af30fc0b2 /fs/lockd/svcsubs.c | |
| parent | 8f8e7a50f450fcb86a5b2ffb94543c57a14f8260 (diff) | |
| download | lwn-01df9c5e918ae5559f2d96da0143f8bfbb9e6171.tar.gz lwn-01df9c5e918ae5559f2d96da0143f8bfbb9e6171.zip | |
LOCKD: Fix a deadlock in nlm_traverse_files()
nlm_traverse_files() is not allowed to hold the nlm_file_mutex while calling
nlm_inspect file, since it may end up calling nlm_release_file() when
releaseing the blocks.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
(cherry picked from e558d3cde986e04f68afe8c790ad68ef4b94587a commit)
Diffstat (limited to 'fs/lockd/svcsubs.c')
| -rw-r--r-- | fs/lockd/svcsubs.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c index 2a4df9b3779a..01b4db9e5466 100644 --- a/fs/lockd/svcsubs.c +++ b/fs/lockd/svcsubs.c @@ -237,19 +237,22 @@ static int nlm_traverse_files(struct nlm_host *host, int action) { struct nlm_file *file, **fp; - int i; + int i, ret = 0; mutex_lock(&nlm_file_mutex); for (i = 0; i < FILE_NRHASH; i++) { fp = nlm_files + i; while ((file = *fp) != NULL) { + file->f_count++; + mutex_unlock(&nlm_file_mutex); + /* Traverse locks, blocks and shares of this file * and update file->f_locks count */ - if (nlm_inspect_file(host, file, action)) { - mutex_unlock(&nlm_file_mutex); - return 1; - } + if (nlm_inspect_file(host, file, action)) + ret = 1; + mutex_lock(&nlm_file_mutex); + file->f_count--; /* No more references to this file. Let go of it. */ if (!file->f_blocks && !file->f_locks && !file->f_shares && !file->f_count) { @@ -262,7 +265,7 @@ nlm_traverse_files(struct nlm_host *host, int action) } } mutex_unlock(&nlm_file_mutex); - return 0; + return ret; } /* |