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authorDipankar Sarma <dipankar@in.ibm.com>2005-09-09 13:04:10 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 13:57:55 -0700
commitbadf16621c1f9d1ac753be056fce11b43d6e0be5 (patch)
tree3fdf833fdf2e3d3a439090743539680449ec3428 /arch
parentc0dfb2905126e9e94edebbce8d3e05001301f52d (diff)
downloadlinux-linaro-badf16621c1f9d1ac753be056fce11b43d6e0be5.tar.gz
[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')
-rw-r--r--arch/alpha/kernel/osf_sys.c4
-rw-r--r--arch/ia64/kernel/perfmon.c7
-rw-r--r--arch/sparc64/solaris/ioctl.c8
3 files changed, 13 insertions, 6 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 167fd89f870..2b034182a0c 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -974,6 +974,7 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
size_t size;
long timeout;
int ret = -EINVAL;
+ struct fdtable *fdt;
timeout = MAX_SCHEDULE_TIMEOUT;
if (tvp) {
@@ -995,7 +996,8 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
}
}
- if (n < 0 || n > current->files->max_fdset)
+ fdt = files_fdtable(current->files);
+ if (n < 0 || n > fdt->max_fdset)
goto out_nofds;
/*
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index f1201ac8a11..4ad97b3b39d 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -38,6 +38,7 @@
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/bitops.h>
+#include <linux/rcupdate.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
@@ -2217,15 +2218,17 @@ static void
pfm_free_fd(int fd, struct file *file)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt = files_fdtable(files);
/*
* there ie no fd_uninstall(), so we do it here
*/
spin_lock(&files->file_lock);
- files->fd[fd] = NULL;
+ rcu_assign_pointer(fdt->fd[fd], NULL);
spin_unlock(&files->file_lock);
- if (file) put_filp(file);
+ if (file)
+ put_filp(file);
put_unused_fd(fd);
}
diff --git a/arch/sparc64/solaris/ioctl.c b/arch/sparc64/solaris/ioctl.c
index cac0a1cf005..374766455f5 100644
--- a/arch/sparc64/solaris/ioctl.c
+++ b/arch/sparc64/solaris/ioctl.c
@@ -293,11 +293,13 @@ static struct module_info {
static inline int solaris_sockmod(unsigned int fd, unsigned int cmd, u32 arg)
{
struct inode *ino;
+ struct fdtable *fdt;
/* I wonder which of these tests are superfluous... --patrik */
spin_lock(&current->files->file_lock);
- if (! current->files->fd[fd] ||
- ! current->files->fd[fd]->f_dentry ||
- ! (ino = current->files->fd[fd]->f_dentry->d_inode) ||
+ fdt = files_fdtable(current->files);
+ if (! fdt->fd[fd] ||
+ ! fdt->fd[fd]->f_dentry ||
+ ! (ino = fdt->fd[fd]->f_dentry->d_inode) ||
! S_ISSOCK(ino->i_mode)) {
spin_unlock(&current->files->file_lock);
return TBADF;