On Monday 20 Jul 2015 16:34:35 Liu Bo wrote:
> On Mon, Jun 01, 2015 at 08:52:49PM +0530, Chandan Rajendra wrote:
> > In subpagesize-blocksize scenario a page can have more than one block. So
> > in addition to PagePrivate2 flag, we would have to track the I/O status of
> > each block of a page to reliably mark the ordered extent as complete.
> >
> > Signed-off-by: Chandan Rajendra <[email protected]>
> > ---
> >
> > fs/btrfs/extent_io.c | 19 +--
> > fs/btrfs/extent_io.h | 5 +-
> > fs/btrfs/inode.c | 346
> > +++++++++++++++++++++++++++++++++++------------- fs/btrfs/ordered-data.c
> > | 17 +++
> > fs/btrfs/ordered-data.h | 4 +
> > 5 files changed, 287 insertions(+), 104 deletions(-)
> >
> > diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> > index 0110abc..55f900a 100644
> > --- a/fs/btrfs/extent_io.c
> > +++ b/fs/btrfs/extent_io.c
> > @@ -4545,11 +4545,10 @@ int extent_invalidatepage(struct extent_io_tree
> > *tree,>
> > * to drop the page.
> > */
> >
> > static int try_release_extent_state(struct extent_map_tree *map,
> >
> > - struct extent_io_tree *tree,
> > - struct page *page, gfp_t mask)
> > + struct extent_io_tree *tree,
> > + struct page *page, u64 start, u64 end,
> > + gfp_t mask)
> >
> > {
> >
> > - u64 start = page_offset(page);
> > - u64 end = start + PAGE_CACHE_SIZE - 1;
> >
> > int ret = 1;
> >
> > if (test_range_bit(tree, start, end,
> >
> > @@ -4583,12 +4582,12 @@ static int try_release_extent_state(struct
> > extent_map_tree *map,>
> > * map records are removed
> > */
> >
> > int try_release_extent_mapping(struct extent_map_tree *map,
> >
> > - struct extent_io_tree *tree, struct page *page,
> > - gfp_t mask)
> > + struct extent_io_tree *tree, struct page *page,
> > + u64 start, u64 end, gfp_t mask)
> >
> > {
> >
> > struct extent_map *em;
> >
> > - u64 start = page_offset(page);
> > - u64 end = start + PAGE_CACHE_SIZE - 1;
> > + u64 orig_start = start;
> > + u64 orig_end = end;
> >
> > if ((mask & __GFP_WAIT) &&
> >
> > page->mapping->host->i_size > 16 * 1024 * 1024) {
> >
> > @@ -4622,7 +4621,9 @@ int try_release_extent_mapping(struct
> > extent_map_tree *map,>
> > free_extent_map(em);
> >
> > }
> >
> > }
> >
> > - return try_release_extent_state(map, tree, page, mask);
> > + return try_release_extent_state(map, tree, page,
> > + orig_start, orig_end,
> > + mask);
> >
> > }
> >
> > /*
> >
> > diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
> > index 8fe5ac3..c629e53 100644
> > --- a/fs/btrfs/extent_io.h
> > +++ b/fs/btrfs/extent_io.h
> > @@ -217,8 +217,9 @@ typedef struct extent_map *(get_extent_t)(struct inode
> > *inode,>
> > void extent_io_tree_init(struct extent_io_tree *tree,
> >
> > struct address_space *mapping);
> >
> > int try_release_extent_mapping(struct extent_map_tree *map,
> >
> > - struct extent_io_tree *tree, struct page *page,
> > - gfp_t mask);
> > + struct extent_io_tree *tree, struct page *page,
> > + u64 start, u64 end,
> > + gfp_t mask);
> >
> > int try_release_extent_buffer(struct page *page);
> > int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
> > int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
> >
> > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> > index bff60c6..bfffc62 100644
> > --- a/fs/btrfs/inode.c
> > +++ b/fs/btrfs/inode.c
> > @@ -2990,56 +2990,115 @@ static void finish_ordered_fn(struct btrfs_work
> > *work)>
> > btrfs_finish_ordered_io(ordered_extent);
> >
> > }
> >
> > -static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64
> > end, - struct extent_state *state, int
uptodate)
> > +static void mark_blks_io_complete(struct btrfs_ordered_extent *ordered,
> > + u64 blk, u64 nr_blks, int uptodate)
> >
> > {
> >
> > - struct inode *inode = page->mapping->host;
> > + struct inode *inode = ordered->inode;
> >
> > struct btrfs_root *root = BTRFS_I(inode)->root;
> >
> > - struct btrfs_ordered_extent *ordered_extent = NULL;
> >
> > struct btrfs_workqueue *wq;
> > btrfs_work_func_t func;
> >
> > - u64 ordered_start, ordered_end;
> >
> > int done;
> >
> > - trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
> > + while (nr_blks--) {
> > + if (test_and_set_bit(blk, ordered->blocks_done)) {
> > + blk++;
> > + continue;
> > + }
> >
> > - ClearPagePrivate2(page);
> > -loop:
> > - ordered_extent = btrfs_lookup_ordered_range(inode, start,
> > - end - start + 1);
> > - if (!ordered_extent)
> > - goto out;
> > + done = btrfs_dec_test_ordered_pending(inode, &ordered,
> > + ordered->file_offset
> > + + (blk << inode->i_sb-
>s_blocksize_bits),
> > + root->sectorsize,
> > + uptodate);
> > + if (done) {
> > + if (btrfs_is_free_space_inode(inode)) {
> > + wq = root->fs_info->endio_freespace_worker;
> > + func = btrfs_freespace_write_helper;
> > + } else {
> > + wq = root->fs_info->endio_write_workers;
> > + func = btrfs_endio_write_helper;
> > + }
> >
> > - ordered_start = max_t(u64, start, ordered_extent->file_offset);
> > - ordered_end = min_t(u64, end,
> > - ordered_extent->file_offset + ordered_extent->len -
1);
> > -
> > - done = btrfs_dec_test_ordered_pending(inode, &ordered_extent,
> > - ordered_start,
> > - ordered_end - ordered_start + 1,
> > - uptodate);
> > - if (done) {
> > - if (btrfs_is_free_space_inode(inode)) {
> > - wq = root->fs_info->endio_freespace_worker;
> > - func = btrfs_freespace_write_helper;
> > - } else {
> > - wq = root->fs_info->endio_write_workers;
> > - func = btrfs_endio_write_helper;
> > + btrfs_init_work(&ordered->work, func,
> > + finish_ordered_fn, NULL, NULL);
> > + btrfs_queue_work(wq, &ordered->work);
> >
> > }
> >
> > - btrfs_init_work(&ordered_extent->work, func,
> > - finish_ordered_fn, NULL, NULL);
> > - btrfs_queue_work(wq, &ordered_extent->work);
> > + blk++;
> >
> > }
> >
> > +}
> >
> > - btrfs_put_ordered_extent(ordered_extent);
> > +int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
> > + struct extent_state *state, int uptodate)
> > +{
> > + struct inode *inode = page->mapping->host;
> > + struct btrfs_root *root = BTRFS_I(inode)->root;
> > + struct btrfs_ordered_extent *ordered_extent = NULL;
> > + u64 blk, nr_blks;
> > + int clear;
> >
> > - start = ordered_end + 1;
> > + trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
> >
> > - if (start < end)
> > - goto loop;
> > + while (start < end) {
> > + ordered_extent = btrfs_lookup_ordered_extent(inode, start);
> > + if (!ordered_extent) {
> > + start += root->sectorsize;
> > + continue;
> > + }
> > +
> > + blk = (start - ordered_extent->file_offset)
> > + >> inode->i_sb->s_blocksize_bits;
> > +
> > + nr_blks = (min(end, ordered_extent->file_offset +
ordered_extent->len -
> > 1) + + 1 - start) >> inode->i_sb->s_blocksize_bits;
> > +
> > + BUG_ON(!nr_blks);
> > +
> > + mark_blks_io_complete(ordered_extent, blk, nr_blks, uptodate);
>
> Range [start, end] is surely contiguous, so why are we processing blocks
> one by one in mark_blks_io_complete()?
>
Liu, Thanks for pointing it out. We can actually get rid of the loop in
mark_blks_io_complete() and set the bits (corresponding to the blocks in the
range [start, end]) at btrfs_ordered_extent->blocks_done using bitmap_set().
> Same question for invalidatepage().
Unfortunately for btrfs_invalidatepage(), we need to loop across the blocks
sequentially. Consider the following file operations,
1. Write blocks [0, 7] to a file. Assume all the 8 blocks are part of the same
ordered extent.
2. Punch a hole starting at block 4 and spanning two blocks in length.
Here btrfs_invalidatepage() gets invoked and hence
btrfs_ordered_extent->bytes_left gets decremented by (2 * sectorsize).
3. Punch a hole starting at block 3 and spanning two blocks in length. Again,
btrfs_invalidatepage() gets invoked and hence
btrfs_ordered_extent->bytes_left gets decremented by (2 * sectorsize). This
isn't corrent since block 4 was already accounted for in step 2.
Hence we will have to check each block's completion status before invoking
btrfs_dec_test_ordered_pending().
>
> Thanks,
>
> -liubo
>
> > +
> > + start = ordered_extent->file_offset + ordered_extent->len;
> > +
> > + btrfs_put_ordered_extent(ordered_extent);
> > + }
> > +
> > + start = page_offset(page);
> > + end = start + PAGE_CACHE_SIZE - 1;
> > + clear = 1;
> > +
> > + while (start < end) {
> > + ordered_extent = btrfs_lookup_ordered_extent(inode, start);
> > + if (!ordered_extent) {
> > + start += root->sectorsize;
> > + continue;
> > + }
> > +
> > + blk = (start - ordered_extent->file_offset)
> > + >> inode->i_sb->s_blocksize_bits;
> > + nr_blks = (min(end, ordered_extent->file_offset +
ordered_extent->len -
> > 1) + + 1 - start) >> inode->i_sb-
>s_blocksize_bits;
> > +
> > + BUG_ON(!nr_blks);
> > +
> > + while (nr_blks--) {
> > + if (!test_bit(blk++, ordered_extent->blocks_done)) {
> > + clear = 0;
> > + break;
> > + }
> > + }
> > +
> > + if (!clear) {
> > + btrfs_put_ordered_extent(ordered_extent);
> > + break;
> > + }
> > +
> > + start += ordered_extent->len;
> > +
> > + btrfs_put_ordered_extent(ordered_extent);
> > + }
> > +
> > + if (clear)
> > + ClearPagePrivate2(page);
> >
> > -out:
> > return 0;
> >
> > }
> >
> > @@ -8472,7 +8531,9 @@ btrfs_readpages(struct file *file, struct
> > address_space *mapping,>
> > return extent_readpages(tree, mapping, pages, nr_pages,
> >
> > btrfs_get_extent);
> >
> > }
> >
> > -static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
> > +
> > +static int __btrfs_releasepage(struct page *page, u64 start, u64 end,
> > + gfp_t gfp_flags)
> >
> > {
> >
> > struct extent_io_tree *tree;
> > struct extent_map_tree *map;
> >
> > @@ -8480,31 +8541,149 @@ static int __btrfs_releasepage(struct page *page,
> > gfp_t gfp_flags)>
> > tree = &BTRFS_I(page->mapping->host)->io_tree;
> > map = &BTRFS_I(page->mapping->host)->extent_tree;
> >
> > - ret = try_release_extent_mapping(map, tree, page, gfp_flags);
> > - if (ret == 1)
> > +
> > + ret = try_release_extent_mapping(map, tree, page, start, end,
> > + gfp_flags);
> > + if ((ret == 1) && ((end - start + 1) == PAGE_CACHE_SIZE)) {
> >
> > clear_page_extent_mapped(page);
> >
> > + } else {
> > + ret = 0;
> > + }
> >
> > return ret;
> >
> > }
> >
> > static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
> > {
> >
> > + u64 start = page_offset(page);
> > + u64 end = start + PAGE_CACHE_SIZE - 1;
> > +
> >
> > if (PageWriteback(page) || PageDirty(page))
> >
> > return 0;
> >
> > - return __btrfs_releasepage(page, gfp_flags & GFP_NOFS);
> > +
> > + return __btrfs_releasepage(page, start, end, gfp_flags & GFP_NOFS);
> > +}
> > +
> > +static void invalidate_ordered_extent_blocks(struct inode *inode,
> > + struct btrfs_ordered_extent *ordered,
> > + u64 locked_start, u64 locked_end,
> > + u64 cur,
> > + int inode_evicting)
> > +{
> > + struct btrfs_root *root = BTRFS_I(inode)->root;
> > + struct btrfs_ordered_inode_tree *ordered_tree;
> > + struct extent_io_tree *tree;
> > + u64 blk, blk_done, nr_blks;
> > + u64 end;
> > + u64 new_len;
> > +
> > + tree = &BTRFS_I(inode)->io_tree;
> > +
> > + end = min(locked_end, ordered->file_offset + ordered->len - 1);
> > +
> > + if (!inode_evicting) {
> > + clear_extent_bit(tree, cur, end,
> > + EXTENT_DIRTY | EXTENT_DELALLOC |
> > + EXTENT_DO_ACCOUNTING |
> > + EXTENT_DEFRAG, 1, 0, NULL,
> > + GFP_NOFS);
> > + unlock_extent(tree, locked_start, locked_end);
> > + }
> > +
> > +
> > + ordered_tree = &BTRFS_I(inode)->ordered_tree;
> > + spin_lock_irq(&ordered_tree->lock);
> > + set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
> > + new_len = cur - ordered->file_offset;
> > + if (new_len < ordered->truncated_len)
> > + ordered->truncated_len = new_len;
> > +
> > + blk = (cur - ordered->file_offset) >> inode->i_sb->s_blocksize_bits;
> > + nr_blks = (end + 1 - cur) >> inode->i_sb->s_blocksize_bits;
> > +
> > + while (nr_blks--) {
> > + blk_done = !test_and_set_bit(blk, ordered->blocks_done);
> > + if (blk_done) {
> > + spin_unlock_irq(&ordered_tree->lock);
> > + if (btrfs_dec_test_ordered_pending(inode, &ordered,
> > + ordered-
>file_offset + (blk << inode->i_sb->s_blocksize_bits),
> > + root-
>sectorsize,
> > + 1))
> > + btrfs_finish_ordered_io(ordered);
> > +
> > + spin_lock_irq(&ordered_tree->lock);
> > + }
> > + blk++;
> > + }
> > +
> > + spin_unlock_irq(&ordered_tree->lock);
> > +
> > + if (!inode_evicting)
> > + lock_extent_bits(tree, locked_start, locked_end, 0, NULL);
> > +}
> > +
> > +static int page_blocks_written(struct page *page)
> > +{
> > + struct btrfs_ordered_extent *ordered;
> > + struct btrfs_root *root;
> > + struct inode *inode;
> > + unsigned long outstanding_blk;
> > + u64 page_start, page_end;
> > + u64 blk, last_blk, nr_blks;
> > + u64 cur;
> > + u64 len;
> > +
> > + inode = page->mapping->host;
> > + root = BTRFS_I(inode)->root;
> > +
> > + page_start = page_offset(page);
> > + page_end = page_start + PAGE_CACHE_SIZE - 1;
> > +
> > + cur = page_start;
> > + while (cur < page_end) {
> > + ordered = btrfs_lookup_ordered_extent(inode, cur);
> > + if (!ordered) {
> > + cur += root->sectorsize;
> > + continue;
> > + }
> > +
> > + blk = (cur - ordered->file_offset)
> > + >> inode->i_sb->s_blocksize_bits;
> > + len = min(page_end, ordered->file_offset + ordered->len - 1)
> > + - cur + 1;
> > + nr_blks = len >> inode->i_sb->s_blocksize_bits;
> > +
> > + last_blk = blk + nr_blks - 1;
> > +
> > + outstanding_blk = find_next_zero_bit(ordered->blocks_done,
> > + ordered->len >> inode->i_sb-
>s_blocksize_bits,
> > + blk);
> > + if (outstanding_blk <= last_blk) {
> > + btrfs_put_ordered_extent(ordered);
> > + return 0;
> > + }
> > +
> > + btrfs_put_ordered_extent(ordered);
> > + cur += len;
> > + }
> > +
> > + return 1;
> >
> > }
> >
> > static void btrfs_invalidatepage(struct page *page, unsigned int offset,
> >
> > - unsigned int length)
> > + unsigned int length)
> >
> > {
> >
> > struct inode *inode = page->mapping->host;
> >
> > + struct btrfs_root *root = BTRFS_I(inode)->root;
> >
> > struct extent_io_tree *tree;
> > struct btrfs_ordered_extent *ordered;
> >
> > - struct extent_state *cached_state = NULL;
> > - u64 page_start = page_offset(page);
> > - u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
> > + u64 start, end, cur;
> > + u64 page_start, page_end;
> >
> > int inode_evicting = inode->i_state & I_FREEING;
> >
> > + page_start = page_offset(page);
> > + page_end = page_start + PAGE_CACHE_SIZE - 1;
> > +
> >
> > /*
> >
> > * we have the page locked, so new writeback can't start,
> > * and the dirty bit won't be cleared while we are here.
> >
> > @@ -8515,73 +8694,54 @@ static void btrfs_invalidatepage(struct page
> > *page, unsigned int offset,>
> > wait_on_page_writeback(page);
> >
> > tree = &BTRFS_I(inode)->io_tree;
> >
> > - if (offset) {
> > +
> > + start = round_up(offset, root->sectorsize);
> > + end = round_down(offset + length, root->sectorsize) - 1;
> > + if (end - start + 1 < root->sectorsize) {
> >
> > btrfs_releasepage(page, GFP_NOFS);
> > return;
> >
> > }
> >
> > + start = round_up(page_start + offset, root->sectorsize);
> > + end = round_down(page_start + offset + length,
> > + root->sectorsize) - 1;
> > +
> >
> > if (!inode_evicting)
> >
> > - lock_extent_bits(tree, page_start, page_end, 0,
&cached_state);
> > - ordered = btrfs_lookup_ordered_range(inode, page_start,
> > PAGE_CACHE_SIZE);
> > - if (ordered) {
> > - /*
> > - * IO on this page will never be started, so we need
> > - * to account for any ordered extents now
> > - */
> > - if (!inode_evicting)
> > - clear_extent_bit(tree, page_start, page_end,
> > - EXTENT_DIRTY | EXTENT_DELALLOC |
> > - EXTENT_LOCKED | EXTENT_DO_ACCOUNTING
|
> > - EXTENT_DEFRAG, 1, 0, &cached_state,
> > - GFP_NOFS);
> > - /*
> > - * whoever cleared the private bit is responsible
> > - * for the finish_ordered_io
> > - */
> > - if (TestClearPagePrivate2(page)) {
> > - struct btrfs_ordered_inode_tree *tree;
> > - u64 new_len;
> > + lock_extent_bits(tree, start, end, 0, NULL);
> >
> > - tree = &BTRFS_I(inode)->ordered_tree;
> > + cur = start;
> > + while (cur < end) {
> > + ordered = btrfs_lookup_ordered_extent(inode, cur);
> > + if (!ordered) {
> > + cur += root->sectorsize;
> > + continue;
> > + }
> >
> > - spin_lock_irq(&tree->lock);
> > - set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
> > - new_len = page_start - ordered->file_offset;
> > - if (new_len < ordered->truncated_len)
> > - ordered->truncated_len = new_len;
> > - spin_unlock_irq(&tree->lock);
> > + invalidate_ordered_extent_blocks(inode, ordered,
> > + start, end, cur,
> > + inode_evicting);
> >
> > - if (btrfs_dec_test_ordered_pending(inode, &ordered,
> > - page_start,
> > - PAGE_CACHE_SIZE,
1))
> > - btrfs_finish_ordered_io(ordered);
> > - }
> > + cur = min(end + 1, ordered->file_offset + ordered->len);
> >
> > btrfs_put_ordered_extent(ordered);
> >
> > - if (!inode_evicting) {
> > - cached_state = NULL;
> > - lock_extent_bits(tree, page_start, page_end, 0,
> > - &cached_state);
> > - }
> >
> > }
> >
> > - if (!inode_evicting) {
> > - clear_extent_bit(tree, page_start, page_end,
> > - EXTENT_LOCKED | EXTENT_DIRTY |
> > - EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
> > - EXTENT_DEFRAG, 1, 1,
> > - &cached_state, GFP_NOFS);
> > + if (page_blocks_written(page))
> > + ClearPagePrivate2(page);
> >
> > - __btrfs_releasepage(page, GFP_NOFS);
> > + if (!inode_evicting) {
> > + clear_extent_bit(tree, start, end,
> > + EXTENT_LOCKED | EXTENT_DIRTY |
> > + EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
> > + EXTENT_DEFRAG, 1, 1, NULL, GFP_NOFS);
> >
> > }
> >
> > - ClearPageChecked(page);
> > - if (PagePrivate(page)) {
> > - ClearPagePrivate(page);
> > - set_page_private(page, 0);
> > - page_cache_release(page);
> > + if (!offset && length == PAGE_CACHE_SIZE) {
> > + WARN_ON(!__btrfs_releasepage(page, start, end, GFP_NOFS));
> > + ClearPageChecked(page);
> >
> > }
> >
> > }
> >
> > +
> >
> > /*
> >
> > * btrfs_page_mkwrite() is not allowed to change the file size as it gets
> > * called from a page fault handler when a page is first dirtied. Hence
> > we must>
> > diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
> > index 157cc54..8e614ca 100644
> > --- a/fs/btrfs/ordered-data.c
> > +++ b/fs/btrfs/ordered-data.c
> > @@ -189,12 +189,25 @@ static int __btrfs_add_ordered_extent(struct inode
> > *inode, u64 file_offset,>
> > struct btrfs_ordered_inode_tree *tree;
> > struct rb_node *node;
> > struct btrfs_ordered_extent *entry;
> >
> > + u64 nr_longs;
> >
> > tree = &BTRFS_I(inode)->ordered_tree;
> > entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS);
> > if (!entry)
> >
> > return -ENOMEM;
> >
> > + nr_longs = BITS_TO_LONGS(len >> inode->i_sb->s_blocksize_bits);
> > + if (nr_longs == 1) {
> > + entry->blocks_done = &entry->blocks_bitmap;
> > + } else {
> > + entry->blocks_done = kzalloc(nr_longs * sizeof(unsigned long),
> > + GFP_NOFS);
> > + if (!entry->blocks_done) {
> > + kmem_cache_free(btrfs_ordered_extent_cache, entry);
> > + return -ENOMEM;
> > + }
> > + }
> > +
> >
> > entry->file_offset = file_offset;
> > entry->start = start;
> > entry->len = len;
> >
> > @@ -553,6 +566,10 @@ void btrfs_put_ordered_extent(struct
> > btrfs_ordered_extent *entry)>
> > list_del(&sum->list);
> > kfree(sum);
> >
> > }
> >
> > +
> > + if (entry->blocks_done != &entry->blocks_bitmap)
> > + kfree(entry->blocks_done);
> > +
> >
> > kmem_cache_free(btrfs_ordered_extent_cache, entry);
> >
> > }
> >
> > }
> >
> > diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
> > index e96cd4c..4b3356a 100644
> > --- a/fs/btrfs/ordered-data.h
> > +++ b/fs/btrfs/ordered-data.h
> > @@ -140,6 +140,10 @@ struct btrfs_ordered_extent {
> >
> > struct completion completion;
> > struct btrfs_work flush_work;
> > struct list_head work_list;
> >
> > +
> > + /* bitmap to track the blocks that have been written to disk */
> > + unsigned long *blocks_done;
> > + unsigned long blocks_bitmap;
> >
> > };
> >
> > /*
--
chandan
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