[PATCH] files: break up files struct

In order for the RCU to work, the file table array, sets and their sizes must
be updated atomically.  Instead of ensuring this through too many memory
barriers, we put the arrays and their sizes in a separate structure.  This
patch takes the first step of putting the file table elements in a separate
structure fdtable that is embedded withing files_struct.  It also changes all
the users to refer to the file table using files_fdtable() macro.  Subsequent
applciation of RCU becomes easier after this.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index c727c195a91a..94aefa54a1b5 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -3,16 +3,21 @@
 
 #include <linux/file.h>
 
-#define INIT_FILES \
-{                                                       \
-        .count          = ATOMIC_INIT(1),               \
-        .file_lock      = SPIN_LOCK_UNLOCKED,           \
+#define INIT_FDTABLE \
+{                                                       \
         .max_fds        = NR_OPEN_DEFAULT,              \
         .max_fdset      = __FD_SETSIZE,                 \
         .next_fd        = 0,                            \
         .fd             = &init_files.fd_array[0],      \
         .close_on_exec  = &init_files.close_on_exec_init, \
         .open_fds       = &init_files.open_fds_init,    \
+}
+
+#define INIT_FILES \
+{                                                       \
+        .count          = ATOMIC_INIT(1),               \
+        .file_lock      = SPIN_LOCK_UNLOCKED,           \
+        .fdtab          = INIT_FDTABLE,                 \
         .close_on_exec_init = { { 0, } },               \
         .open_fds_init  = { { 0, } },                   \
         .fd_array       = { NULL, }                     \