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The NFS quota-reporting RPC uses 32-bit sized fields. We approximate

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64-bit quota sizes by scaling down the sizes by the minimum amount
necessary to fit in a 32-bit field and then upscale the filesystem
block size to compensate. For example, if the hard block limit is
0x300000008 then we set the hard block limit to 0xA0000002 and claim
that the blocksize is 4 * DEV_BSIZE. This will lose the minimal
amount of information thus delivering nearly correct answers.
This commit is contained in:
Kirk McKusick 2010-04-25 00:05:51 +00:00
parent 516ad57b74
commit 5092109703
1 changed files with 7 additions and 4 deletions
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11
libexec/rpc.rquotad/rquotad.c
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@ -126,6 +126,7 @@ sendquota(struct svc_req *request, SVCXPRT *transp)
struct getquota_rslt getq_rslt;
struct dqblk dqblk;
struct timeval timev;
int scale;
bzero(&getq_args, sizeof(getq_args));
if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
@ -142,13 +143,15 @@ sendquota(struct svc_req *request, SVCXPRT *transp)
gettimeofday(&timev, NULL);
getq_rslt.status = Q_OK;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
scale = 1 << flsll(dqblk.dqb_bhardlimit >> 32);
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize =
DEV_BSIZE * scale;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
dqblk.dqb_bhardlimit;
dqblk.dqb_bhardlimit / scale;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
dqblk.dqb_bsoftlimit;
dqblk.dqb_bsoftlimit / scale;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
dqblk.dqb_curblocks;
dqblk.dqb_curblocks / scale;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
dqblk.dqb_ihardlimit;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =