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authorPavel Emelyanov <xemul@parallels.com>2011-10-31 17:10:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-31 17:30:51 -0700
commitd70ef97baf048412c395bb5d65791d8fe133a52b (patch)
tree3e546d3a29bcf52d52304aeb3fa911c65fc52ef7 /fs/pipe.c
parenta8aff21ecc8c455687c5bb2b98cb04dce3eea7c7 (diff)
fs/pipe.c: add ->statfs callback for pipefs
Currently a statfs on a pipe's /proc/<pid>/fd/ link returns -ENOSYS. Wire pipfs up so that the statfs succeeds. This is required by checkpoint-restart in the userspace to make it possible to distinguish pipes from fifos. When we dump information about task's open files we use the /proc/pid/fd directoy's symlinks and the fact that opening any of them gives us exactly the same dentry->inode pair as the original process has. Now if a task we're dumping has opened pipe and fifo we need to detect this and act accordingly. Knowing that an fd with type S_ISFIFO resides on a pipefs is the most precise way. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Reviewed-by: Tejun Heo <tj@kernel.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 0e0be1dc0f8..4065f07366b 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1254,6 +1254,7 @@ out:
static const struct super_operations pipefs_ops = {
.destroy_inode = free_inode_nonrcu,
+ .statfs = simple_statfs,
};
/*