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-rw-r--r--fs/ext4/file.c54
1 files changed, 16 insertions, 38 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 831fd6beebf0..02ce7e7bbdf5 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -474,57 +474,37 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
endoff = (loff_t)end_blk << blkbits;
index = startoff >> PAGE_SHIFT;
- end = endoff >> PAGE_SHIFT;
+ end = (endoff - 1) >> PAGE_SHIFT;
pagevec_init(&pvec, 0);
do {
int i, num;
unsigned long nr_pages;
- num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
+ num = min_t(pgoff_t, end - index, PAGEVEC_SIZE - 1) + 1;
nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
(pgoff_t)num);
- if (nr_pages == 0) {
- if (whence == SEEK_DATA)
- break;
-
- BUG_ON(whence != SEEK_HOLE);
- /*
- * If this is the first time to go into the loop and
- * offset is not beyond the end offset, it will be a
- * hole at this offset
- */
- if (lastoff == startoff || lastoff < endoff)
- found = 1;
- break;
- }
-
- /*
- * If this is the first time to go into the loop and
- * offset is smaller than the first page offset, it will be a
- * hole at this offset.
- */
- if (lastoff == startoff && whence == SEEK_HOLE &&
- lastoff < page_offset(pvec.pages[0])) {
- found = 1;
+ if (nr_pages == 0)
break;
- }
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
struct buffer_head *bh, *head;
/*
- * If the current offset is not beyond the end of given
- * range, it will be a hole.
+ * If current offset is smaller than the page offset,
+ * there is a hole at this offset.
*/
- if (lastoff < endoff && whence == SEEK_HOLE &&
- page->index > end) {
+ if (whence == SEEK_HOLE && lastoff < endoff &&
+ lastoff < page_offset(pvec.pages[i])) {
found = 1;
*offset = lastoff;
goto out;
}
+ if (page->index > end)
+ goto out;
+
lock_page(page);
if (unlikely(page->mapping != inode->i_mapping)) {
@@ -564,20 +544,18 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
unlock_page(page);
}
- /*
- * The no. of pages is less than our desired, that would be a
- * hole in there.
- */
- if (nr_pages < num && whence == SEEK_HOLE) {
- found = 1;
- *offset = lastoff;
+ /* The no. of pages is less than our desired, we are done. */
+ if (nr_pages < num)
break;
- }
index = pvec.pages[i - 1]->index + 1;
pagevec_release(&pvec);
} while (index <= end);
+ if (whence == SEEK_HOLE && lastoff < endoff) {
+ found = 1;
+ *offset = lastoff;
+ }
out:
pagevec_release(&pvec);
return found;
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