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Subject[PATCH 2/3] fs/ntfs: Make ntfs to support circular buffer list.
Date
Modify mark_ntfs_record_dirty to support circular buffer list.
alloc_page_buffers created circular buffer list. So the circular list
linking in ntfs_sync_mft_mirror is unnecessary.

Signed-off-by: Sean Fu <fxinrong@gmail.com>
---
fs/ntfs/aops.c | 6 ++----
fs/ntfs/mft.c | 4 ----
2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 3a2e509..4e69577 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -1746,10 +1746,8 @@ void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs) {

do {
set_buffer_uptodate(bh);
- tail = bh;
bh = bh->b_this_page;
- } while (bh);
- tail->b_this_page = head;
+ } while (bh != head);
attach_page_buffers(page, head);
} else
buffers_to_free = bh;
@@ -1771,7 +1769,7 @@ void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs) {
bh = buffers_to_free->b_this_page;
free_buffer_head(buffers_to_free);
buffers_to_free = bh;
- } while (buffers_to_free);
+ } while (buffers_to_free != head);
}
}

diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index ee8392a..26ba4f6 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -505,15 +505,11 @@ int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
memcpy(kmirr, m, vol->mft_record_size);
/* Create uptodate buffers if not present. */
if (unlikely(!page_has_buffers(page))) {
- struct buffer_head *tail;
-
bh = head = alloc_page_buffers(page, blocksize, true);
do {
set_buffer_uptodate(bh);
- tail = bh;
bh = bh->b_this_page;
} while (bh);
- tail->b_this_page = head;
attach_page_buffers(page, head);
}
bh = head = page_buffers(page);
--
2.6.2
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