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knfsd: nfsd: make all exp_finding functions return -errno's on err
Currently exp_find(), exp_get_by_name(), and friends, return an export on success, and on failure return: errors -EAGAIN (drop this request pending an upcall) or -ETIMEDOUT (an upcall has timed out), or return NULL, which can mean either that there was a memory allocation failure, or that an export was not found, or that a passed-in export lacks an auth_domain. Many callers seem to assume that NULL means that an export was not found, which may lead to bugs in the case of a memory allocation failure. Modify these functions to distinguish between the two NULL cases by returning either -ENOENT or -ENOMEM. They now never return NULL. We get to simplify some code in the process. We return -ENOENT in the case of a missing auth_domain. This case should probably be removed (or converted to a bug) after confirming that it can never happen. Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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47f9940c55
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2d3bb25209
@ -739,16 +739,18 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
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int err;
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if (!clp)
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return NULL;
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return ERR_PTR(-ENOENT);
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key.ek_client = clp;
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key.ek_fsidtype = fsid_type;
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memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
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ek = svc_expkey_lookup(&key);
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if (ek != NULL)
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if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
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ek = ERR_PTR(err);
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if (ek == NULL)
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return ERR_PTR(-ENOMEM);
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err = cache_check(&svc_expkey_cache, &ek->h, reqp);
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if (err)
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return ERR_PTR(err);
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return ek;
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}
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@ -809,30 +811,21 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
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struct cache_req *reqp)
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{
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struct svc_export *exp, key;
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int err;
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if (!clp)
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return NULL;
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return ERR_PTR(-ENOENT);
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key.ex_client = clp;
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key.ex_mnt = mnt;
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key.ex_dentry = dentry;
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exp = svc_export_lookup(&key);
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if (exp != NULL) {
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int err;
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err = cache_check(&svc_export_cache, &exp->h, reqp);
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switch (err) {
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case 0: break;
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case -EAGAIN:
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case -ETIMEDOUT:
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exp = ERR_PTR(err);
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break;
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default:
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exp = NULL;
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}
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}
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if (exp == NULL)
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return ERR_PTR(-ENOMEM);
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err = cache_check(&svc_export_cache, &exp->h, reqp);
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if (err)
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return ERR_PTR(err);
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return exp;
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}
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@ -848,7 +841,7 @@ exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
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dget(dentry);
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exp = exp_get_by_name(clp, mnt, dentry, reqp);
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while (exp == NULL && !IS_ROOT(dentry)) {
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while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
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struct dentry *parent;
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parent = dget_parent(dentry);
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@ -901,7 +894,7 @@ static void exp_fsid_unhash(struct svc_export *exp)
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return;
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ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
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if (ek && !IS_ERR(ek)) {
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if (!IS_ERR(ek)) {
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ek->h.expiry_time = get_seconds()-1;
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cache_put(&ek->h, &svc_expkey_cache);
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}
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@ -939,7 +932,7 @@ static void exp_unhash(struct svc_export *exp)
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struct inode *inode = exp->ex_dentry->d_inode;
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ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
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if (ek && !IS_ERR(ek)) {
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if (!IS_ERR(ek)) {
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ek->h.expiry_time = get_seconds()-1;
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cache_put(&ek->h, &svc_expkey_cache);
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}
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@ -990,13 +983,12 @@ exp_export(struct nfsctl_export *nxp)
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/* must make sure there won't be an ex_fsid clash */
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if ((nxp->ex_flags & NFSEXP_FSID) &&
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(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
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!IS_ERR(fsid_key) &&
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(!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
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fsid_key->ek_mnt &&
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(fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
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goto finish;
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if (exp) {
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if (!IS_ERR(exp)) {
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/* just a flags/id/fsid update */
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exp_fsid_unhash(exp);
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@ -1105,7 +1097,7 @@ exp_unexport(struct nfsctl_export *nxp)
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err = -EINVAL;
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exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
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path_release(&nd);
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if (!exp)
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if (IS_ERR(exp))
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goto out_domain;
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exp_do_unexport(exp);
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@ -1150,10 +1142,6 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
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err = PTR_ERR(exp);
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goto out;
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}
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if (!exp) {
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dprintk("nfsd: exp_rootfh export not found.\n");
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goto out;
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}
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/*
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* fh must be initialized before calling fh_compose
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@ -1177,13 +1165,13 @@ exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
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{
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struct svc_export *exp;
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struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
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if (!ek || IS_ERR(ek))
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if (IS_ERR(ek))
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return ERR_PTR(PTR_ERR(ek));
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exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
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cache_put(&ek->h, &svc_expkey_cache);
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if (!exp || IS_ERR(exp))
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if (IS_ERR(exp))
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return ERR_PTR(PTR_ERR(exp));
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return exp;
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}
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@ -1205,10 +1193,10 @@ exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
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mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
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exp = exp_find(clp, FSID_NUM, fsidv, creq);
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if (PTR_ERR(exp) == -ENOENT)
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return nfserr_perm;
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if (IS_ERR(exp))
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return nfserrno(PTR_ERR(exp));
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if (exp == NULL)
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return nfserr_perm;
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rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
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exp_put(exp);
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return rv;
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@ -160,16 +160,15 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
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&rqstp->rq_chandle);
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}
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if (IS_ERR(exp) && (PTR_ERR(exp) == -EAGAIN
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|| PTR_ERR(exp) == -ETIMEDOUT)) {
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error = nfserr_stale;
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if (PTR_ERR(exp) == -ENOENT)
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goto out;
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if (IS_ERR(exp)) {
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error = nfserrno(PTR_ERR(exp));
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goto out;
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}
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error = nfserr_stale;
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if (!exp || IS_ERR(exp))
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goto out;
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/* Check if the request originated from a secure port. */
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error = nfserr_perm;
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if (!rqstp->rq_secure && EX_SECURE(exp)) {
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@ -192,15 +192,14 @@ nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
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exp2 = exp_parent(exp->ex_client, mnt, dentry,
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&rqstp->rq_chandle);
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if (IS_ERR(exp2)) {
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if (PTR_ERR(exp2) == -ENOENT) {
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dput(dentry);
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dentry = dget(dparent);
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} else if (IS_ERR(exp2)) {
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host_err = PTR_ERR(exp2);
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dput(dentry);
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mntput(mnt);
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goto out_nfserr;
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}
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if (!exp2) {
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dput(dentry);
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dentry = dget(dparent);
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} else {
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exp_put(exp);
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exp = exp2;
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