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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2015-04-16 21:47:56 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 15:04:07 +0200 |
| commit | 90f31d0ea88880f780574f3d0bb1a227c4c66ca3 (patch) | |
| tree | 5367f83919939a2d83888b3a1c48e5ba06e0f574 /fs/file.c | |
| parent | Doc/sysctl/kernel.txt: document threads-max (diff) | |
| download | linux-90f31d0ea88880f780574f3d0bb1a227c4c66ca3.tar.xz linux-90f31d0ea88880f780574f3d0bb1a227c4c66ca3.zip | |
mm: rcu-protected get_mm_exe_file()
This patch removes mm->mmap_sem from mm->exe_file read side.
Also it kills dup_mm_exe_file() and moves exe_file duplication into
dup_mmap() where both mmap_sems are locked.
[akpm@linux-foundation.org: fix comment typo]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/file.c')
| -rw-r--r-- | fs/file.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/file.c b/fs/file.c index ee738ea028fa..93c5f89c248b 100644 --- a/fs/file.c +++ b/fs/file.c @@ -638,8 +638,7 @@ static struct file *__fget(unsigned int fd, fmode_t mask) file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ - if ((file->f_mode & mask) || - !atomic_long_inc_not_zero(&file->f_count)) + if ((file->f_mode & mask) || !get_file_rcu(file)) file = NULL; } rcu_read_unlock(); |