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authorNathan Scott <nathans@sgi.com>2005-05-05 13:33:20 -0700
committerChristoph Hellwig <hch@melbourne.sgi.com>2005-05-05 13:33:20 -0700
commit24e17b5fb99d4d1b47fe0847a3a801e36d431ff6 (patch)
tree0ac181b6ddc64a04fe55aa79efceecc6e4d90451 /fs/xfs/linux-2.6/xfs_aops.c
parent775bf6c99a4ebde13bdb8dfa528ed241483b49ef (diff)
[XFS] Use the right offset when ensuring a delayed allocate conversion has covered the offset originally requested. Can cause data corruption when multiple processes are performing writeout on different areas of the same file. Quite difficult to hit though.
SGI Modid: xfs-linux:xfs-kern:22377a Signed-off-by: Nathan Scott <nathans@sgi.com> Signed-off-by: Christoph Hellwig <hch@sgi.com> .
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_aops.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_aops.c68
1 files changed, 39 insertions, 29 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 1edd3b69433..9278e9aba9b 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -558,7 +558,8 @@ xfs_submit_page(
int i;
BUG_ON(PageWriteback(page));
- set_page_writeback(page);
+ if (bh_count)
+ set_page_writeback(page);
if (clear_dirty)
clear_page_dirty(page);
unlock_page(page);
@@ -578,9 +579,6 @@ xfs_submit_page(
if (probed_page && clear_dirty)
wbc->nr_to_write--; /* Wrote an "extra" page */
- } else {
- end_page_writeback(page);
- wbc->pages_skipped++; /* We didn't write this page */
}
}
@@ -602,21 +600,26 @@ xfs_convert_page(
{
struct buffer_head *bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
xfs_iomap_t *mp = iomapp, *tmp;
- unsigned long end, offset;
- pgoff_t end_index;
- int i = 0, index = 0;
+ unsigned long offset, end_offset;
+ int index = 0;
int bbits = inode->i_blkbits;
+ int len, page_dirty;
- end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
- if (page->index < end_index) {
- end = PAGE_CACHE_SIZE;
- } else {
- end = i_size_read(inode) & (PAGE_CACHE_SIZE-1);
- }
+ end_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1));
+
+ /*
+ * page_dirty is initially a count of buffers on the page before
+ * EOF and is decrememted as we move each into a cleanable state.
+ */
+ len = 1 << inode->i_blkbits;
+ end_offset = max(end_offset, PAGE_CACHE_SIZE);
+ end_offset = roundup(end_offset, len);
+ page_dirty = end_offset / len;
+
+ offset = 0;
bh = head = page_buffers(page);
do {
- offset = i << bbits;
- if (offset >= end)
+ if (offset >= end_offset)
break;
if (!(PageUptodate(page) || buffer_uptodate(bh)))
continue;
@@ -625,6 +628,7 @@ xfs_convert_page(
if (startio) {
lock_buffer(bh);
bh_arr[index++] = bh;
+ page_dirty--;
}
continue;
}
@@ -657,10 +661,11 @@ xfs_convert_page(
unlock_buffer(bh);
mark_buffer_dirty(bh);
}
- } while (i++, (bh = bh->b_this_page) != head);
+ page_dirty--;
+ } while (offset += len, (bh = bh->b_this_page) != head);
- if (startio) {
- xfs_submit_page(page, wbc, bh_arr, index, 1, index == i);
+ if (startio && index) {
+ xfs_submit_page(page, wbc, bh_arr, index, 1, !page_dirty);
} else {
unlock_page(page);
}
@@ -743,19 +748,22 @@ xfs_page_state_convert(
}
}
- offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
end_offset = min_t(unsigned long long,
- offset + PAGE_CACHE_SIZE, i_size_read(inode));
-
- bh = head = page_buffers(page);
- iomp = NULL;
+ (loff_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset);
+ offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
/*
- * page_dirty is initially a count of buffers on the page and
- * is decrememted as we move each into a cleanable state.
+ * page_dirty is initially a count of buffers on the page before
+ * EOF and is decrememted as we move each into a cleanable state.
*/
- len = bh->b_size;
- page_dirty = PAGE_CACHE_SIZE / len;
+ len = 1 << inode->i_blkbits;
+ p_offset = max(p_offset, PAGE_CACHE_SIZE);
+ p_offset = roundup(p_offset, len);
+ page_dirty = p_offset / len;
+
+ iomp = NULL;
+ p_offset = 0;
+ bh = head = page_buffers(page);
do {
if (offset >= end_offset)
@@ -877,8 +885,10 @@ xfs_page_state_convert(
if (uptodate && bh == head)
SetPageUptodate(page);
- if (startio)
- xfs_submit_page(page, wbc, bh_arr, cnt, 0, 1);
+ if (startio) {
+ WARN_ON(page_dirty);
+ xfs_submit_page(page, wbc, bh_arr, cnt, 0, !page_dirty);
+ }
if (iomp) {
offset = (iomp->iomap_offset + iomp->iomap_bsize - 1) >>