iomap: mark newly allocated buffer heads as new (3d7b6b21) · Commits · 戴 / test

In iomap_to_bh, not only mark buffer heads in IOMAP_UNWRITTEN maps as new, but also buffer heads in IOMAP_MAPPED maps with the IOMAP_F_NEW flag set. This will be used by filesystems like gfs2, which allocate blocks in iomap->begin. Minor corrections to the comment for IOMAP_UNWRITTEN maps. Signed-off-by:

Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by:

Christoph Hellwig <hch@lst.de> Reviewed-by:

Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:

Darrick J. Wong <darrick.wong@oracle.com>

fs/buffer.c

+5 −4

Original line number	Diff line number	Diff line
		@@ -1900,15 +1900,16 @@ iomap_to_bh(struct inode inode, sector_t block, struct buffer_head bh,
		break;
		case IOMAP_UNWRITTEN:
		/*
		* For unwritten regions, we always need to ensure that
		* sub-block writes cause the regions in the block we are not
		* writing to are zeroed. Set the buffer as new to ensure this.
		* For unwritten regions, we always need to ensure that regions
		* in the block we are not writing to are zeroed. Mark the
		* buffer as new to ensure this.
		*/
		set_buffer_new(bh);
		set_buffer_unwritten(bh);
		/* FALLTHRU */
		case IOMAP_MAPPED:
		if (offset >= i_size_read(inode))
		if ((iomap->flags & IOMAP_F_NEW) \|\|
		offset >= i_size_read(inode))
		set_buffer_new(bh);
		bh->b_blocknr = (iomap->addr + offset - iomap->offset) >>
		inode->i_blkbits;

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