diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2006-03-18 13:26:44 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2006-03-18 18:34:04 -0500 |
| commit | a6a0763a60eef374d4f02f82a6ecb6a74f380fcb (patch) | |
| tree | ab6811f034eb2839ee07bc8e251b96a1aba313f7 /block/cfq-iosched.c | |
| parent | 12a057321529df2fb650ac5f34dfd7abcca667df (diff) | |
| download | lwn-a6a0763a60eef374d4f02f82a6ecb6a74f380fcb.tar.gz lwn-a6a0763a60eef374d4f02f82a6ecb6a74f380fcb.zip | |
[PATCH] fix the exclusion for ioprio_set()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 63bfe4b494ba..3bacf4bb7dd2 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -47,6 +47,8 @@ static int cfq_slice_idle = HZ / 100; */ static const int cfq_max_depth = 2; +static DEFINE_RWLOCK(cfq_exit_lock); + /* * for the hash of cfqq inside the cfqd */ @@ -1354,13 +1356,19 @@ static inline void changed_ioprio(struct cfq_io_context *cic) */ static int cfq_ioc_set_ioprio(struct io_context *ioc, unsigned int ioprio) { - struct cfq_io_context *cic = ioc->cic; + struct cfq_io_context *cic; + + write_lock(&cfq_exit_lock); + + cic = ioc->cic; changed_ioprio(cic); list_for_each_entry(cic, &cic->list, list) changed_ioprio(cic); + write_unlock(&cfq_exit_lock); + return 0; } @@ -1450,8 +1458,10 @@ cfq_get_io_context(struct cfq_data *cfqd, pid_t pid, gfp_t gfp_mask) */ cic->ioc = ioc; cic->key = cfqd; + read_lock(&cfq_exit_lock); ioc->set_ioprio = cfq_ioc_set_ioprio; ioc->cic = cic; + read_unlock(&cfq_exit_lock); } else { struct cfq_io_context *__cic; @@ -1487,7 +1497,9 @@ cfq_get_io_context(struct cfq_data *cfqd, pid_t pid, gfp_t gfp_mask) __cic->ioc = ioc; __cic->key = cfqd; + read_lock(&cfq_exit_lock); list_add(&__cic->list, &cic->list); + read_unlock(&cfq_exit_lock); cic = __cic; } |