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NFSD: Add struct nfsd4_fattr_args
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I'm about to split nfsd4_encode_fattr() into a number of smaller
functions. Instead of passing a large number of arguments to each of
the smaller functions, create a struct that can gather the common
argument variables into something with a convenient handle on it.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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Chuck Lever committed Oct 16, 2023
1 parent c3dcb45 commit 83ab867
Showing 1 changed file with 65 additions and 52 deletions.
117 changes: 65 additions & 52 deletions fs/nfsd/nfs4xdr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2938,6 +2938,16 @@ nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
return nfserr_resource;
}

struct nfsd4_fattr_args {
struct svc_fh *fhp;
struct kstat stat;
struct kstatfs statfs;
struct nfs4_acl *acl;
u64 size;
u32 rdattr_err;
bool contextsupport;
};

/*
* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
* ourselves.
Expand All @@ -2948,26 +2958,22 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
struct dentry *dentry, u32 *bmval,
struct svc_rqst *rqstp, int ignore_crossmnt)
{
struct nfsd4_fattr_args args;
u32 bmval0 = bmval[0];
u32 bmval1 = bmval[1];
u32 bmval2 = bmval[2];
struct kstat stat;
struct svc_fh *tempfh = NULL;
struct kstatfs statfs;
__be32 *p, *attrlen_p;
int starting_len = xdr->buf->len;
int attrlen_offset;
u32 dummy;
u64 dummy64;
u32 rdattr_err = 0;
__be32 status;
int err;
struct nfs4_acl *acl = NULL;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
void *context = NULL;
int contextlen;
#endif
bool contextsupport = false;
struct nfsd4_compoundres *resp = rqstp->rq_resp;
u32 minorversion = resp->cstate.minorversion;
struct path path = {
Expand All @@ -2981,31 +2987,36 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
BUG_ON(!nfsd_attrs_supported(minorversion, bmval));

args.rdattr_err = 0;
if (exp->ex_fslocs.migrated) {
status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2,
&args.rdattr_err);
if (status)
goto out;
}
args.size = 0;
if (bmval0 & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
status = nfsd4_deleg_getattr_conflict(rqstp, d_inode(dentry),
&file_modified, &size);
if (status)
goto out;
}

err = vfs_getattr(&path, &stat,
err = vfs_getattr(&path, &args.stat,
STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
AT_STATX_SYNC_AS_STAT);
if (err)
goto out_nfserr;
if (!(stat.result_mask & STATX_BTIME))
args.size = file_modified ? size : args.stat.size;

if (!(args.stat.result_mask & STATX_BTIME))
/* underlying FS does not offer btime so we can't share it */
bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
(bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
FATTR4_WORD1_SPACE_TOTAL))) {
err = vfs_statfs(&path, &statfs);
err = vfs_statfs(&path, &args.statfs);
if (err)
goto out_nfserr;
}
Expand All @@ -3018,10 +3029,13 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
status = fh_compose(tempfh, exp, dentry, NULL);
if (status)
goto out;
fhp = tempfh;
}
args.fhp = tempfh;
} else
args.fhp = fhp;

args.acl = NULL;
if (bmval0 & FATTR4_WORD0_ACL) {
err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
if (err == -EOPNOTSUPP)
bmval0 &= ~FATTR4_WORD0_ACL;
else if (err == -EINVAL) {
Expand All @@ -3031,6 +3045,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
goto out_nfserr;
}

args.contextsupport = false;

#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
Expand All @@ -3039,7 +3055,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
&context, &contextlen);
else
err = -EOPNOTSUPP;
contextsupport = (err == 0);
args.contextsupport = (err == 0);
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
if (err == -EOPNOTSUPP)
bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
Expand All @@ -3065,7 +3081,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,

if (!IS_POSIXACL(dentry->d_inode))
supp[0] &= ~FATTR4_WORD0_ACL;
if (!contextsupport)
if (!args.contextsupport)
supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
if (!supp[2]) {
p = xdr_reserve_space(xdr, 12);
Expand All @@ -3088,7 +3104,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
dummy = nfs4_file_type(stat.mode);
dummy = nfs4_file_type(args.stat.mode);
if (dummy == NF4BAD) {
status = nfserr_serverfault;
goto out;
Expand All @@ -3109,16 +3125,13 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = encode_change(p, &stat, d_inode(dentry), exp);
p = encode_change(p, &args.stat, d_inode(dentry), exp);
}
if (bmval0 & FATTR4_WORD0_SIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
if (file_modified)
p = xdr_encode_hyper(p, size);
else
p = xdr_encode_hyper(p, stat.size);
p = xdr_encode_hyper(p, args.size);
}
if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
Expand All @@ -3145,16 +3158,16 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
if (exp->ex_fslocs.migrated) {
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
} else switch(fsid_source(fhp)) {
} else switch (fsid_source(args.fhp)) {
case FSIDSOURCE_FSID:
p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
p = xdr_encode_hyper(p, (u64)0);
break;
case FSIDSOURCE_DEV:
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MAJOR(stat.dev));
*p++ = cpu_to_be32(MAJOR(args.stat.dev));
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MINOR(stat.dev));
*p++ = cpu_to_be32(MINOR(args.stat.dev));
break;
case FSIDSOURCE_UUID:
p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
Expand All @@ -3178,12 +3191,12 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(rdattr_err);
*p++ = cpu_to_be32(args.rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
struct nfs4_ace *ace;

if (acl == NULL) {
if (args.acl == NULL) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
Expand All @@ -3194,9 +3207,9 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(acl->naces);
*p++ = cpu_to_be32(args.acl->naces);

for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
for (ace = args.acl->aces; ace < args.acl->aces + args.acl->naces; ace++) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
Expand Down Expand Up @@ -3242,35 +3255,35 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
p = xdr_reserve_space(xdr, args.fhp->fh_handle.fh_size + 4);
if (!p)
goto out_resource;
p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
fhp->fh_handle.fh_size);
p = xdr_encode_opaque(p, &args.fhp->fh_handle.fh_raw,
args.fhp->fh_handle.fh_size);
}
if (bmval0 & FATTR4_WORD0_FILEID) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, stat.ino);
p = xdr_encode_hyper(p, args.stat.ino);
}
if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
p = xdr_encode_hyper(p, (u64) args.statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
p = xdr_encode_hyper(p, (u64) args.statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_files);
p = xdr_encode_hyper(p, (u64) args.statfs.f_files);
}
if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
Expand Down Expand Up @@ -3299,7 +3312,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(statfs.f_namelen);
*p++ = cpu_to_be32(args.statfs.f_namelen);
}
if (bmval0 & FATTR4_WORD0_MAXREAD) {
p = xdr_reserve_space(xdr, 8);
Expand All @@ -3317,7 +3330,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.mode & S_IALLUGO);
*p++ = cpu_to_be32(args.stat.mode & S_IALLUGO);
}
if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
p = xdr_reserve_space(xdr, 4);
Expand All @@ -3329,60 +3342,60 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.nlink);
*p++ = cpu_to_be32(args.stat.nlink);
}
if (bmval1 & FATTR4_WORD1_OWNER) {
status = nfsd4_encode_user(xdr, rqstp, stat.uid);
status = nfsd4_encode_user(xdr, rqstp, args.stat.uid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
status = nfsd4_encode_group(xdr, rqstp, stat.gid);
status = nfsd4_encode_group(xdr, rqstp, args.stat.gid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_RAWDEV) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
*p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
*p++ = cpu_to_be32((u32) MINOR(stat.rdev));
*p++ = cpu_to_be32((u32) MAJOR(args.stat.rdev));
*p++ = cpu_to_be32((u32) MINOR(args.stat.rdev));
}
if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
dummy64 = (u64)args.statfs.f_bavail * (u64)args.statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
dummy64 = (u64)args.statfs.f_bfree * (u64)args.statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
dummy64 = (u64)args.statfs.f_blocks * (u64)args.statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_USED) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)stat.blocks << 9;
dummy64 = (u64)args.stat.blocks << 9;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
status = nfsd4_encode_nfstime4(xdr, &stat.atime);
status = nfsd4_encode_nfstime4(xdr, &args.stat.atime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
status = nfsd4_encode_nfstime4(xdr, &stat.btime);
status = nfsd4_encode_nfstime4(xdr, &args.stat.btime);
if (status)
goto out;
}
Expand All @@ -3393,17 +3406,17 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = encode_time_delta(p, d_inode(dentry));
}
if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
status = nfsd4_encode_nfstime4(xdr, &stat.ctime);
status = nfsd4_encode_nfstime4(xdr, &args.stat.ctime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
status = nfsd4_encode_nfstime4(xdr, &stat.mtime);
status = nfsd4_encode_nfstime4(xdr, &args.stat.mtime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
u64 ino = stat.ino;
u64 ino = args.stat.ino;

p = xdr_reserve_space(xdr, 8);
if (!p)
Expand Down Expand Up @@ -3438,7 +3451,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.blksize);
*p++ = cpu_to_be32(args.stat.blksize);
}
#endif /* CONFIG_NFSD_PNFS */
if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
Expand Down Expand Up @@ -3479,7 +3492,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
if (context)
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
kfree(acl);
kfree(args.acl);
if (tempfh) {
fh_put(tempfh);
kfree(tempfh);
Expand Down

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