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xfs: Move handling of missing page into one place in xfs_find_get_desired_pgoff() 

Currently several places in xfs_find_get_desired_pgoff() handle the case
of a missing page. Make them all handled in one place after the loop has
terminated.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Jan Kara 2017-05-18 16:36:24 -07:00 committed by Darrick J. Wong
parent d7fd24257a
commit a54fba8f5a
1 changed files with 8 additions and 30 deletions
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38
fs/xfs/xfs_file.c
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@ -1052,29 +1052,8 @@ xfs_find_get_desired_pgoff(
want = min_t(pgoff_t, end - index, PAGEVEC_SIZE - 1) + 1;
nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
want);
/*
* No page mapped into given range. If we are searching holes
* and if this is the first time we got into the loop, it means
* that the given offset is landed in a hole, return it.
*
* If we have already stepped through some block buffers to find
* holes but they all contains data. In this case, the last
* offset is already updated and pointed to the end of the last
* mapped page, if it does not reach the endpoint to search,
* that means there should be a hole between them.
*/
if (nr_pages == 0) {
/* Data search found nothing */
if (type == DATA_OFF)
break;
ASSERT(type == HOLE_OFF);
if (lastoff == startoff || lastoff < endoff) {
found = true;
*offset = lastoff;
}
if (nr_pages == 0)
break;
}
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
@ -1140,21 +1119,20 @@ xfs_find_get_desired_pgoff(
/*
* The number of returned pages less than our desired, search
* done. In this case, nothing was found for searching data,
* but we found a hole behind the last offset.
* done.
*/
if (nr_pages < want) {
if (type == HOLE_OFF) {
*offset = lastoff;
found = true;
}
if (nr_pages < want)
break;
}
index = pvec.pages[i - 1]->index + 1;
pagevec_release(&pvec);
} while (index <= end);
/* No page at lastoff and we are not done - we found a hole. */
if (type == HOLE_OFF && lastoff < endoff) {
*offset = lastoff;
found = true;
}
out:
pagevec_release(&pvec);
return found;