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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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4
drivers/char/tty_io.c
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@@ -2480,7 +2480,7 @@ static void __do_SAK(void *arg)
}
task_lock(p);
if (p->files) {
spin_lock(&p->files->file_lock);
rcu_read_lock();
fdt = files_fdtable(p->files);
for (i=0; i < fdt->max_fds; i++) {
filp = fcheck_files(p->files, i);
@@ -2495,7 +2495,7 @@ static void __do_SAK(void *arg)
break;
}
}
spin_unlock(&p->files->file_lock);
rcu_read_unlock();
}
task_unlock(p);
} while_each_task_pid(session, PIDTYPE_SID, p);