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[PATCH] files: lock-free fd look-up

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With the use of RCU in files structure, the look-up of files using fds can now
be lock-free.  The lookup is protected by rcu_read_lock()/rcu_read_unlock().
This patch changes the readers to use lock-free lookup.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dipankar Sarma
2005-09-09 13:04:14 -07:00
committed by Linus Torvalds
parent ab2af1f500
commit b835996f62
9 changed files with 39 additions and 27 deletions
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7
arch/sparc64/solaris/ioctl.c
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@@ -24,6 +24,7 @@
#include <linux/netdevice.h>
#include <linux/mtio.h>
#include <linux/time.h>
#include <linux/rcupdate.h>
#include <linux/compat.h>
#include <net/sock.h>
@@ -295,16 +296,16 @@ 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);
rcu_read_lock();
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);
rcu_read_unlock();
return TBADF;
}
spin_unlock(&current->files->file_lock);
rcu_read_unlock();
switch (cmd & 0xff) {
case 109: /* SI_SOCKPARAMS */