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nfsd4: decrease nfsd4_encode_fattr stack usage 

A struct svc_fh is 320 bytes on x86_64, it'd be better not to have these
on the stack.

kmalloc'ing them probably isn't ideal either, but this is the simplest
thing to do.  If it turns out to be a problem in the readdir case then
we could add a svc_fh to nfsd4_readdir and pass that in.

Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2014-01-15 12:21:12 -05:00
parent 068c34c0ce
commit d50e61361c
1 changed files with 10 additions and 6 deletions
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16
fs/nfsd/nfs4xdr.c
View File

@ -2058,7 +2058,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
u32 bmval1 = bmval[1];
u32 bmval2 = bmval[2];
struct kstat stat;
struct svc_fh tempfh;
struct svc_fh *tempfh = NULL;
struct kstatfs statfs;
int buflen = count << 2;
__be32 *attrlenp;
@ -2105,11 +2105,15 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
goto out_nfserr;
}
if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
fh_init(&tempfh, NFS4_FHSIZE);
status = fh_compose(&tempfh, exp, dentry, NULL);
tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
status = nfserr_jukebox;
if (!tempfh)
goto out;
fh_init(tempfh, NFS4_FHSIZE);
status = fh_compose(tempfh, exp, dentry, NULL);
if (status)
goto out;
fhp = &tempfh;
fhp = tempfh;
}
if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
| FATTR4_WORD0_SUPPORTED_ATTRS)) {
@ -2495,8 +2499,8 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
kfree(acl);
if (fhp == &tempfh)
fh_put(&tempfh);
if (tempfh)
fh_put(tempfh);
return status;
out_nfserr:
status = nfserrno(err);