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Commit 72d36d05 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher
Browse files

gfs2: Add support for IOMAP_ZERO 



Add support for the IOMAP_ZERO iomap operation so that iomap_zero_range will
work as expected.  In the IOMAP_ZERO case, the caller of iomap_zero_range is
responsible for taking an exclusive glock on the inode, so we need no
additional locking in gfs2_iomap_begin.

Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: default avatarBob Peterson <rpeterso@redhat.com>
parent 34aad20b

fs/gfs2/bmap.c

+10 −2
Original line number Diff line number Diff line
@@ -1168,7 +1168,7 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length, 
	if (ret)

		goto out_unlock;



	switch(flags & IOMAP_WRITE) {

	switch(flags & (IOMAP_WRITE | IOMAP_ZERO)) {

	case IOMAP_WRITE:

		if (flags & IOMAP_DIRECT) {

			/*
@@ -1180,6 +1180,10 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length, 
			goto out_unlock;

		}

		break;

	case IOMAP_ZERO:

		if (iomap->type == IOMAP_HOLE)

			goto out_unlock;

		break;

	default:

		goto out_unlock;

	}
@@ -1201,11 +1205,15 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length, 
	struct gfs2_inode *ip = GFS2_I(inode);

	struct gfs2_sbd *sdp = GFS2_SB(inode);



	switch (flags & IOMAP_WRITE) {

	switch (flags & (IOMAP_WRITE | IOMAP_ZERO)) {

	case IOMAP_WRITE:

		if (flags & IOMAP_DIRECT)

			return 0;

		break;

	case IOMAP_ZERO:

		 if (iomap->type == IOMAP_HOLE)

			 return 0;

		 break;

	default:

		 return 0;

	}