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fuse: fix READDIRPLUS skipping an entry 

commit c6cdd51404 upstream.

Marios Titas running a Haskell program noticed a problem with fuse's
readdirplus: when it is interrupted by a signal, it skips one directory
entry.

The reason is that fuse erronously updates ctx->pos after a failed
dir_emit().

The issue originates from the patch adding readdirplus support.

Reported-by: Jakob Unterwurzacher <jakobunt@gmail.com>
Tested-by: Marios Titas <redneb@gmx.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 0b05b18381 ("fuse: implement NFS-like readdirplus support")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Miklos Szeredi 2017-10-25 16:34:27 +02:00 committed by Greg Kroah-Hartman
parent d8e5f2f8d5
commit 8783885ea7
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/dir.c
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@ -1312,7 +1312,8 @@ static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
*/
over = !dir_emit(ctx, dirent->name, dirent->namelen,
dirent->ino, dirent->type);
ctx->pos = dirent->off;
if (!over)
ctx->pos = dirent->off;
}
buf += reclen;