Commit 27e6c7a3 authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: mark buffer heads as delayed until the data is written to disk 



Nilfs does not allocate new blocks on disk until they are actually
written to.  To implement fiemap, we need to deal with such blocks.

To allow successive fiemap patch to distinguish mapped but unallocated
regions, this marks buffer heads of those new blocks as delayed and
clears the flag after the blocks are written to disk.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent e828949e

fs/nilfs2/inode.c

+1 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff, 
		nilfs_transaction_commit(inode->i_sb); /* never fails */

		/* Error handling should be detailed */

		set_buffer_new(bh_result);

		set_buffer_delay(bh_result);

		map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed

						      to proper value */

	} else if (ret == -ENOENT) {

fs/nilfs2/segment.c

+2 −0
Original line number Diff line number Diff line
@@ -1763,6 +1763,7 @@ static void nilfs_clear_copied_buffers(struct list_head *list, int err) 
				if (!err) {

					set_buffer_uptodate(bh);

					clear_buffer_dirty(bh);

					clear_buffer_delay(bh);

					clear_buffer_nilfs_volatile(bh);

				}

				brelse(bh); /* for b_assoc_buffers */
@@ -1889,6 +1890,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) 
				    b_assoc_buffers) {

			set_buffer_uptodate(bh);

			clear_buffer_dirty(bh);

			clear_buffer_delay(bh);

			clear_buffer_nilfs_volatile(bh);

			clear_buffer_nilfs_redirected(bh);

			if (bh == segbuf->sb_super_root) {

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