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authorAl Viro <viro@zeniv.linux.org.uk>2009-03-30 07:20:30 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-03-31 23:00:26 -0400
commit498052bba55ecaff58db6a1436b0e25bfd75a7ff (patch)
treebd3644ac60737e3733995a203acebd70cfd1b21b /fs/proc
parent3e93cd671813e204c258f1e6c797959920cf7772 (diff)
New locking/refcounting for fs_struct
* all changes of current->fs are done under task_lock and write_lock of old fs->lock * refcount is not atomic anymore (same protection) * its decrements are done when removing reference from current; at the same time we decide whether to free it. * put_fs_struct() is gone * new field - ->in_exec. Set by check_unsafe_exec() if we are trying to do execve() and only subthreads share fs_struct. Cleared when finishing exec (success and failure alike). Makes CLONE_FS fail with -EAGAIN if set. * check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread is in progress. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/task_nommu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 343ea1216bc8..6ca01052c5bc 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -49,7 +49,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
49 else 49 else
50 bytes += kobjsize(mm); 50 bytes += kobjsize(mm);
51 51
52 if (current->fs && atomic_read(&current->fs->count) > 1) 52 if (current->fs && current->fs->users > 1)
53 sbytes += kobjsize(current->fs); 53 sbytes += kobjsize(current->fs);
54 else 54 else
55 bytes += kobjsize(current->fs); 55 bytes += kobjsize(current->fs);