The patch titled
fs/pipe.c: add ->statfs callback for pipefs
has been added to the -mm tree. Its filename is
fs-pipec-add-statfs-callback-for-pipefs.patch
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------------------------------------------------------
Subject: fs/pipe.c: add ->statfs callback for pipefs
From: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Reviewed-by: Tejun Heo <tj@xxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/pipe.c~fs-pipec-add-statfs-callback-for-pipefs fs/pipe.c
--- a/fs/pipe.c~fs-pipec-add-statfs-callback-for-pipefs
+++ a/fs/pipe.c
@@ -1254,6 +1254,7 @@ out:
static const struct super_operations pipefs_ops = {
.destroy_inode = free_inode_nonrcu,
+ .statfs = simple_statfs,
};
/*
_
Patches currently in -mm which might be from xemul@xxxxxxxxxxxxx are
fs-pipec-add-statfs-callback-for-pipefs.patch
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