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| author | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2014-06-29 16:55:02 +0300 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2014-07-19 09:53:52 +0300 |
| commit | 07e19dff63e3d5d6500d831e36554ac9b1b0560e (patch) | |
| tree | e921a551f3f7aa3b38fa253829efb735e2421fbb | |
| parent | 39274a1e8dd18d47e7ba76a90adc384f14f20a4f (diff) | |
| download | lwn-07e19dff63e3d5d6500d831e36554ac9b1b0560e.tar.gz lwn-07e19dff63e3d5d6500d831e36554ac9b1b0560e.zip | |
UBIFS: remove mst_mutex
The 'mst_mutex' is not needed since because 'ubifs_write_master()' is only
called on the mount path and commit path. The mount path is sequential and
there is no parallelism, and the commit path is also serialized - there is only
one commit going on at a time.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| -rw-r--r-- | fs/ubifs/commit.c | 2 | ||||
| -rw-r--r-- | fs/ubifs/master.c | 7 | ||||
| -rw-r--r-- | fs/ubifs/super.c | 1 | ||||
| -rw-r--r-- | fs/ubifs/ubifs.h | 2 |
4 files changed, 3 insertions, 9 deletions
diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c index ff8229340cd5..aa13ad053b14 100644 --- a/fs/ubifs/commit.c +++ b/fs/ubifs/commit.c @@ -174,7 +174,6 @@ static int do_commit(struct ubifs_info *c) if (err) goto out; - mutex_lock(&c->mst_mutex); c->mst_node->cmt_no = cpu_to_le64(c->cmt_no); c->mst_node->log_lnum = cpu_to_le32(new_ltail_lnum); c->mst_node->root_lnum = cpu_to_le32(zroot.lnum); @@ -204,7 +203,6 @@ static int do_commit(struct ubifs_info *c) else c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_NO_ORPHS); err = ubifs_write_master(c); - mutex_unlock(&c->mst_mutex); if (err) goto out; diff --git a/fs/ubifs/master.c b/fs/ubifs/master.c index ab83ace9910a..1a4bb9e8b3b8 100644 --- a/fs/ubifs/master.c +++ b/fs/ubifs/master.c @@ -352,10 +352,9 @@ int ubifs_read_master(struct ubifs_info *c) * ubifs_write_master - write master node. * @c: UBIFS file-system description object * - * This function writes the master node. The caller has to take the - * @c->mst_mutex lock before calling this function. Returns zero in case of - * success and a negative error code in case of failure. The master node is - * written twice to enable recovery. + * This function writes the master node. Returns zero in case of success and a + * negative error code in case of failure. The master node is written twice to + * enable recovery. */ int ubifs_write_master(struct ubifs_info *c) { diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index bed5ebfb7c71..106bf20629ce 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1963,7 +1963,6 @@ static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) mutex_init(&c->lp_mutex); mutex_init(&c->tnc_mutex); mutex_init(&c->log_mutex); - mutex_init(&c->mst_mutex); mutex_init(&c->umount_mutex); mutex_init(&c->bu_mutex); mutex_init(&c->write_reserve_mutex); diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index 977a01bf1720..c4fe900c67ab 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -1049,7 +1049,6 @@ struct ubifs_debug_info; * * @mst_node: master node * @mst_offs: offset of valid master node - * @mst_mutex: protects the master node area, @mst_node, and @mst_offs * * @max_bu_buf_len: maximum bulk-read buffer length * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu @@ -1290,7 +1289,6 @@ struct ubifs_info { struct ubifs_mst_node *mst_node; int mst_offs; - struct mutex mst_mutex; int max_bu_buf_len; struct mutex bu_mutex; |