Commit 166725d9 authored by Andrew Price's avatar Andrew Price Committed by Bob Peterson
Browse files

gfs2: Add rindex fields to rgrp headers 



Add rg_data0, rg_data and rg_bitbytes to struct gfs2_rgrp. The fields
are identical to their counterparts in struct gfs2_rindex and are
intended to reduce the use of the rindex. For now the fields are only
written back as the in-memory equivalents in struct gfs2_rgrpd are set
using values from the rindex. However, they are needed at this point so
that userspace can make use of them, allowing a migration away from the
rindex over time.

The new fields take up previously reserved space which was explicitly
zeroed on write so, in clusters with mixed kernels, these fields could
get zeroed after being set and this should not be treated as an error.

Signed-off-by: default avatarAndrew Price <anprice@redhat.com>
Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
parent 65adc273

fs/gfs2/rgrp.c

+5 −0
Original line number Diff line number Diff line
@@ -1040,6 +1040,7 @@ static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf) 
	rgd->rd_free = be32_to_cpu(str->rg_free);

	rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);

	rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);

	/* rd_data0, rd_data and rd_bitbytes already set from rindex */

}



static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
@@ -1055,6 +1056,10 @@ static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf) 
	else if (next->rd_addr > rgd->rd_addr)

		str->rg_skip = cpu_to_be32(next->rd_addr - rgd->rd_addr);

	str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);

	str->rg_data0 = cpu_to_be64(rgd->rd_data0);

	str->rg_data = cpu_to_be32(rgd->rd_data);

	str->rg_bitbytes = cpu_to_be32(rgd->rd_bitbytes);



	memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));

}

include/uapi/linux/gfs2_ondisk.h

+6 −1
Original line number Diff line number Diff line
@@ -192,8 +192,13 @@ struct gfs2_rgrp { 
		__be32 rg_skip; /* Distance to the next rgrp in fs blocks */

	};

	__be64 rg_igeneration;

	/* The following 3 fields are duplicated from gfs2_rindex to reduce

	   reliance on the rindex */

	__be64 rg_data0;     /* First data location */

	__be32 rg_data;      /* Number of data blocks in rgrp */

	__be32 rg_bitbytes;  /* Number of bytes in data bitmaps */



	__u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */

	__u8 rg_reserved[64]; /* Several fields from gfs1 now reserved */

};



/*

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