staging/lustre/llite: remove ll_file_get_iov_count

It exactly copies generic_segment_checks() except wrongly calling
access_ok(VERIFY_READ) for aio read range. Drop it and just call
generic_segment_checks() instead.

Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 8f03eb0..996c19d 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -1148,38 +1148,6 @@ out:
        return result;
 }
 
-
-/*
- * XXX: exact copy from kernel code (__generic_file_aio_write_nolock)
- */
-static int ll_file_get_iov_count(const struct iovec *iov,
-                                unsigned long *nr_segs, size_t *count)
-{
-       size_t cnt = 0;
-       unsigned long seg;
-
-       for (seg = 0; seg < *nr_segs; seg++) {
-               const struct iovec *iv = &iov[seg];
-
-               /*
-                * If any segment has a negative length, or the cumulative
-                * length ever wraps negative then return -EINVAL.
-                */
-               cnt += iv->iov_len;
-               if (unlikely((ssize_t)(cnt|iv->iov_len) < 0))
-                       return -EINVAL;
-               if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
-                       continue;
-               if (seg == 0)
-                       return -EFAULT;
-               *nr_segs = seg;
-               cnt -= iv->iov_len;   /* This segment is no good */
-               break;
-       }
-       *count = cnt;
-       return 0;
-}
-
 static ssize_t ll_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                                unsigned long nr_segs, loff_t pos)
 {
@@ -1189,7 +1157,7 @@ static ssize_t ll_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
        ssize_t      result;
        int              refcheck;
 
-       result = ll_file_get_iov_count(iov, &nr_segs, &count);
+       result = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
        if (result)
                return result;
 
@@ -1248,7 +1216,7 @@ static ssize_t ll_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
        ssize_t      result;
        int              refcheck;
 
-       result = ll_file_get_iov_count(iov, &nr_segs, &count);
+       result = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
        if (result)
                return result;