ext4: fix SEEK_HOLE (7d95eddf) · Commits · 戴 / test

Currently, SEEK_HOLE implementation in ext4 may both return that there's a hole at some offset although that offset already has data and skip some holes during a search for the next hole. The first problem is demostrated by: xfs_io -c "falloc 0 256k" -c "pwrite 0 56k" -c "seek -h 0" file wrote 57344/57344 bytes at offset 0 56 KiB, 14 ops; 0.0000 sec (2.054 GiB/sec and 538461.5385 ops/sec) Whence Result HOLE 0 Where we can see that SEEK_HOLE wrongly returned offset 0 as containing a hole although we have written data there. The second problem can be demonstrated by: xfs_io -c "falloc 0 256k" -c "pwrite 0 56k" -c "pwrite 128k 8k" -c "seek -h 0" file wrote 57344/57344 bytes at offset 0 56 KiB, 14 ops; 0.0000 sec (1.978 GiB/sec and 518518.5185 ops/sec) wrote 8192/8192 bytes at offset 131072 8 KiB, 2 ops; 0.0000 sec (2 GiB/sec and 500000.0000 ops/sec) Whence Result HOLE 139264 Where we can see that hole at offsets 56k..128k has been ignored by the SEEK_HOLE call. The underlying problem is in the ext4_find_unwritten_pgoff() which is just buggy. In some cases it fails to update returned offset when it finds a hole (when no pages are found or when the first found page has higher index than expected), in some cases conditions for detecting hole are just missing (we fail to detect a situation where indices of returned pages are not contiguous). Fix ext4_find_unwritten_pgoff() to properly detect non-contiguous page indices and also handle all cases where we got less pages then expected in one place and handle it properly there. CC: stable@vger.kernel.org Fixes: CC: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by:

Jan Kara <jack@suse.cz> Signed-off-by:

Theodore Ts'o <tytso@mit.edu>

fs/ext4/file.c

+14 −36

Original line number	Diff line number	Diff line
		@@ -484,47 +484,27 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
		num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
		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;
		if (nr_pages == 0)
		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;
		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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