From af6a4e280e3ff453653f39190b57b345ff0bec16 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 14 Feb 2007 00:33:12 -0800 Subject: [PATCH] knfsd: add some new fsid types Add support for using a filesystem UUID to identify and export point in the filehandle. For NFSv2, this UUID is xor-ed down to 4 or 8 bytes so that it doesn't take up too much room. For NFSv3+, we use the full 16 bytes, and possibly also a 64bit inode number for exports beneath the root of a filesystem. When generating an fsid to return in 'stat' information, use the UUID (hashed down to size) if it is available and a small 'fsid' was not specifically provided. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfs3xdr.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) (limited to 'fs/nfsd/nfs3xdr.c') diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index e695660921e..6f677988c71 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -149,6 +149,27 @@ decode_sattr3(__be32 *p, struct iattr *iap) return p; } +static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) +{ + u64 f; + switch(fsid_source(fhp)) { + default: + case FSIDSOURCE_DEV: + p = xdr_encode_hyper(p, (u64)huge_encode_dev + (fhp->fh_dentry->d_inode->i_sb->s_dev)); + break; + case FSIDSOURCE_FSID: + p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); + break; + case FSIDSOURCE_UUID: + f = ((u64*)fhp->fh_export->ex_uuid)[0]; + f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; + p = xdr_encode_hyper(p, f); + break; + } + return p; +} + static __be32 * encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat) @@ -169,10 +190,7 @@ encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); *p++ = htonl((u32) MAJOR(stat->rdev)); *p++ = htonl((u32) MINOR(stat->rdev)); - if (is_fsid(fhp, rqstp->rq_reffh)) - p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); - else - p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat->dev)); + p = encode_fsid(p, fhp); p = xdr_encode_hyper(p, (u64) stat->ino); p = encode_time3(p, &stat->atime); lease_get_mtime(dentry->d_inode, &time); @@ -203,10 +221,7 @@ encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); *p++ = fhp->fh_post_rdev[0]; *p++ = fhp->fh_post_rdev[1]; - if (is_fsid(fhp, rqstp->rq_reffh)) - p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); - else - p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev)); + p = encode_fsid(p, fhp); p = xdr_encode_hyper(p, (u64) inode->i_ino); p = encode_time3(p, &fhp->fh_post_atime); p = encode_time3(p, &fhp->fh_post_mtime); -- cgit v1.2.3