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| author | J. Bruce Fields | 2014-01-15 18:21:12 +0100 |
|---|---|---|
| committer | J. Bruce Fields | 2014-01-24 21:58:21 +0100 |
| commit | d50e61361c68a05a9cd7d54617522f99f278ac8a (patch) | |
| tree | ee0f62664a334349fc18445deef62cca0cd31e3a /fs/nfsd/nfs4xdr.c | |
| parent | nfsd: fix encode_entryplus_baggage stack usage (diff) | |
| download | kernel-qcow2-linux-d50e61361c68a05a9cd7d54617522f99f278ac8a.tar.gz kernel-qcow2-linux-d50e61361c68a05a9cd7d54617522f99f278ac8a.tar.xz kernel-qcow2-linux-d50e61361c68a05a9cd7d54617522f99f278ac8a.zip | |
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>
Diffstat (limited to 'fs/nfsd/nfs4xdr.c')
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 8198ecf3c03a..63f2395c57ed 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -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 @@ out: 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); |