fuse: Introduce fi->lock to protect write related fields
To minimize contention of fc->lock, this patch introduces a new spinlock
for protection fuse_inode metadata:
fuse_inode:
writectr
writepages
write_files
queued_writes
attr_version
inode:
i_size
i_nlink
i_mtime
i_ctime
Also, it protects the fields changed in fuse_change_attributes_common()
(too many to list).
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 47c7b22..1c610b6 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -96,7 +96,7 @@
union {
/* Write related fields (regular file only) */
struct {
- /* Files usable in writepage. Protected by fc->lock */
+ /* Files usable in writepage. Protected by fi->lock */
struct list_head write_files;
/* Writepages pending on truncate or fsync */
@@ -144,6 +144,9 @@
/** Lock for serializing lookup and readdir for back compatibility*/
struct mutex mutex;
+
+ /** Lock to protect write related fields */
+ spinlock_t lock;
};
/** FUSE inode state bits */