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iomap: mark newly allocated buffer heads as new

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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 <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
This commit is contained in:
Andreas Gruenbacher authored and Darrick J. Wong committed 2018-06-19 15:10:55 -07:00
1 parent a6d639da63
commit 3d7b6b21f6
1 file changed
+5 -4
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fs/buffer.c
+5 -4
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@@ -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;