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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-22 17:04:53 -0800
committerIngo Molnar <mingo@elte.hu>2010-02-25 10:34:49 +0100
commitaf61b96b4f68f7ab25ebf34fed275fabf64f2edc (patch)
treea24d5f4645f5eafcbef8cdc01e1ced247f2f8920 /include
parent7dc52157982ab771f40e3c0b7dc55b954c3c2d19 (diff)
vfs: Abstract rcu_dereference_check for files-fdtable use
Create an rcu_dereference_check_fdtable() that encapsulates the rcu_dereference_check() condition for fcheck_files() use. This has the beneficial side-effect of getting rid of a very long line. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1266887105-1528-9-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fdtable.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index 144412fface..013dc529e95 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -57,11 +57,14 @@ struct files_struct {
struct file * fd_array[NR_OPEN_DEFAULT];
};
-#define files_fdtable(files) \
- (rcu_dereference_check((files)->fdt, \
+#define rcu_dereference_check_fdtable(files, fdtfd) \
+ (rcu_dereference_check((fdtfd), \
rcu_read_lock_held() || \
lockdep_is_held(&(files)->file_lock) || \
- atomic_read(&files->count) == 1))
+ atomic_read(&(files)->count) == 1))
+
+#define files_fdtable(files) \
+ (rcu_dereference_check_fdtable((files), (files)->fdt))
struct file_operations;
struct vfsmount;
@@ -82,7 +85,7 @@ static inline struct file * fcheck_files(struct files_struct *files, unsigned in
struct fdtable *fdt = files_fdtable(files);
if (fd < fdt->max_fds)
- file = rcu_dereference_check(fdt->fd[fd], rcu_read_lock_held() || lockdep_is_held(&files->file_lock) || atomic_read(&files->count) == 1);
+ file = rcu_dereference_check_fdtable(files, fdt->fd[fd]);
return file;
}