[PATCH 1/1] locks: Fix procfs output for file leases

[PATCH 1/1] locks: Fix procfs output for file leases

[Pavel Begunkov (Silence)]

From: Pavel Begunkov <asml.silence@gmail.com>

Since commit 778fc546f749c588aa2f ("locks: fix tracking of inprogress
lease breaks"), leases break don't change @fl_type but modifies
@fl_flags. However, procfs's part haven't been updated.

Previously, for a breaking lease the target type was printed (see
target_leasetype()), as returns fcntl(F_GETLEASE). But now it's always
"READ", as F_UNLCK no longer means "breaking". Unlike the previous
one, this behaviour don't provide a complete description of the lease.

There are /proc/pid/fdinfo/ outputs for a lease (the same for READ and
WRITE) breaked by O_WRONLY.
-- before:
lock:   1: LEASE  BREAKING  READ  2558 08:03:815793 0 EOF
-- after:
lock:   1: LEASE  BREAKING  UNLCK  2558 08:03:815793 0 EOF

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/locks.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 686eae21daf6..24d1db632f6c 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2784,10 +2784,10 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
 			       ? (fl->fl_type & LOCK_WRITE) ? "RW   " : "READ "
 			       : (fl->fl_type & LOCK_WRITE) ? "WRITE" : "NONE ");
 	} else {
-		seq_printf(f, "%s ",
-			       (lease_breaking(fl))
-			       ? (fl->fl_type == F_UNLCK) ? "UNLCK" : "READ "
-			       : (fl->fl_type == F_WRLCK) ? "WRITE" : "READ ");
+		int type = IS_LEASE(fl) ? target_leasetype(fl) : fl->fl_type;
+
+		seq_printf(f, "%s ", (type == F_WRLCK) ? "WRITE" :
+				     (type == F_RDLCK) ? "READ" : "UNLCK");
 	}
 	if (inode) {
 		/* userspace relies on this representation of dev_t */
-- 
2.22.0

Re: [PATCH 1/1] locks: Fix procfs output for file leases

[Jeff Layton]

On Wed, 2019-07-24 at 20:16 +0300, Pavel Begunkov (Silence) wrote:
> From: Pavel Begunkov <asml.silence@gmail.com>
> 
> Since commit 778fc546f749c588aa2f ("locks: fix tracking of inprogress
> lease breaks"), leases break don't change @fl_type but modifies
> @fl_flags. However, procfs's part haven't been updated.
> 
> Previously, for a breaking lease the target type was printed (see
> target_leasetype()), as returns fcntl(F_GETLEASE). But now it's always
> "READ", as F_UNLCK no longer means "breaking". Unlike the previous
> one, this behaviour don't provide a complete description of the lease.
> 
> There are /proc/pid/fdinfo/ outputs for a lease (the same for READ and
> WRITE) breaked by O_WRONLY.
> -- before:
> lock:   1: LEASE  BREAKING  READ  2558 08:03:815793 0 EOF
> -- after:
> lock:   1: LEASE  BREAKING  UNLCK  2558 08:03:815793 0 EOF
> 
> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> ---
>  fs/locks.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/locks.c b/fs/locks.c
> index 686eae21daf6..24d1db632f6c 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -2784,10 +2784,10 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
>  			       ? (fl->fl_type & LOCK_WRITE) ? "RW   " : "READ "
>  			       : (fl->fl_type & LOCK_WRITE) ? "WRITE" : "NONE ");
>  	} else {
> -		seq_printf(f, "%s ",
> -			       (lease_breaking(fl))
> -			       ? (fl->fl_type == F_UNLCK) ? "UNLCK" : "READ "
> -			       : (fl->fl_type == F_WRLCK) ? "WRITE" : "READ ");
> +		int type = IS_LEASE(fl) ? target_leasetype(fl) : fl->fl_type;
> +
> +		seq_printf(f, "%s ", (type == F_WRLCK) ? "WRITE" :
> +				     (type == F_RDLCK) ? "READ" : "UNLCK");
>  	}
>  	if (inode) {
>  		/* userspace relies on this representation of dev_t */

Thanks! Merged for v5.4.
-- 
Jeff Layton <jlayton@kernel.org>