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gfs2: Add a crc field to resource group headers

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Add the rg_crc field to store a crc32 of the gfs2_rgrp structure. This
allows us to check resource group headers' integrity and removes the
requirement to check them against the rindex entries in fsck. If this
field is found to be zero, it should be ignored (or updated with an
accurate value).

Signed-off-by: Andrew Price <[email protected]>
Signed-off-by: Bob Peterson <[email protected]>
This commit is contained in:
Andrew Price 2017-12-12 11:42:30 -06:00 • committed by Bob Peterson
commit 850d2d915f
2 changed files with 7 additions and 1 deletions
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5
fs/gfs2/rgrp.c
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@ -34,6 +34,7 @@
#include "log.h"
#include "inode.h"
#include "trace_gfs2.h"
#include "dir.h"
#define BFITNOENT ((u32)~0)
#define NO_BLOCK ((u64)~0)
@ -1047,6 +1048,7 @@ static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
{
struct gfs2_rgrpd *next = gfs2_rgrpd_get_next(rgd);
struct gfs2_rgrp *str = buf;
u32 crc;
str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
str->rg_free = cpu_to_be32(rgd->rd_free);
@ -1059,6 +1061,9 @@ static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
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);
str->rg_crc = 0;
crc = gfs2_disk_hash(buf, sizeof(struct gfs2_rgrp));
str->rg_crc = cpu_to_be32(crc);
memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
}