CIFS: Add descriptions to the brlock cache functions
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index cf0b153..4dd9283 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -702,6 +702,13 @@
lock->type, lock->netfid, conf_lock);
}
+/*
+ * Check if there is another lock that prevents us to set the lock (mandatory
+ * style). If such a lock exists, update the flock structure with its
+ * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
+ * or leave it the same if we can't. Returns 0 if we don't need to request to
+ * the server or 1 otherwise.
+ */
static int
cifs_lock_test(struct cifsInodeInfo *cinode, __u64 offset, __u64 length,
__u8 type, __u16 netfid, struct file_lock *flock)
@@ -739,6 +746,12 @@
mutex_unlock(&cinode->lock_mutex);
}
+/*
+ * Set the byte-range lock (mandatory style). Returns:
+ * 1) 0, if we set the lock and don't need to request to the server;
+ * 2) 1, if no locks prevent us but we need to request to the server;
+ * 3) -EACCESS, if there is a lock that prevents us and wait is false.
+ */
static int
cifs_lock_add_if(struct cifsInodeInfo *cinode, struct cifsLockInfo *lock,
bool wait)
@@ -778,6 +791,13 @@
return rc;
}
+/*
+ * Check if there is another lock that prevents us to set the lock (posix
+ * style). If such a lock exists, update the flock structure with its
+ * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
+ * or leave it the same if we can't. Returns 0 if we don't need to request to
+ * the server or 1 otherwise.
+ */
static int
cifs_posix_lock_test(struct file *file, struct file_lock *flock)
{
@@ -800,6 +820,12 @@
return rc;
}
+/*
+ * Set the byte-range lock (posix style). Returns:
+ * 1) 0, if we set the lock and don't need to request to the server;
+ * 2) 1, if we need to request to the server;
+ * 3) <0, if the error occurs while setting the lock.
+ */
static int
cifs_posix_lock_set(struct file *file, struct file_lock *flock)
{