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authorDipankar Sarma <dipankar@in.ibm.com>2005-09-09 16:04:10 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 16:57:55 -0400
commitbadf16621c1f9d1ac753be056fce11b43d6e0be5 (patch)
tree3fdf833fdf2e3d3a439090743539680449ec3428 /arch/ia64/kernel/perfmon.c
parentc0dfb2905126e9e94edebbce8d3e05001301f52d (diff)
[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>
Diffstat (limited to 'arch/ia64/kernel/perfmon.c')
-rw-r--r--arch/ia64/kernel/perfmon.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index f1201ac8a116..4ad97b3b39dc 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -38,6 +38,7 @@
38#include <linux/pagemap.h> 38#include <linux/pagemap.h>
39#include <linux/mount.h> 39#include <linux/mount.h>
40#include <linux/bitops.h> 40#include <linux/bitops.h>
41#include <linux/rcupdate.h>
41 42
42#include <asm/errno.h> 43#include <asm/errno.h>
43#include <asm/intrinsics.h> 44#include <asm/intrinsics.h>
@@ -2217,15 +2218,17 @@ static void
2217pfm_free_fd(int fd, struct file *file) 2218pfm_free_fd(int fd, struct file *file)
2218{ 2219{
2219 struct files_struct *files = current->files; 2220 struct files_struct *files = current->files;
2221 struct fdtable *fdt = files_fdtable(files);
2220 2222
2221 /* 2223 /*
2222 * there ie no fd_uninstall(), so we do it here 2224 * there ie no fd_uninstall(), so we do it here
2223 */ 2225 */
2224 spin_lock(&files->file_lock); 2226 spin_lock(&files->file_lock);
2225 files->fd[fd] = NULL; 2227 rcu_assign_pointer(fdt->fd[fd], NULL);
2226 spin_unlock(&files->file_lock); 2228 spin_unlock(&files->file_lock);
2227 2229
2228 if (file) put_filp(file); 2230 if (file)
2231 put_filp(file);
2229 put_unused_fd(fd); 2232 put_unused_fd(fd);
2230} 2233}
2231 2234