Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2d3bb25209c1f9a27ea9535c7fd2f6729a5e7db1
Commit: 2d3bb25209c1f9a27ea9535c7fd2f6729a5e7db1
Parent: 47f9940c55c0bdc65188749cae4e841601f513bb
Author: J. Bruce Fields <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 17 04:04:40 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Jul 17 10:23:07 2007 -0700
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" <[EMAIL PROTECTED]>
Signed-off-by: Neil Brown <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/nfsd/export.c | 58 +++++++++++++++++++++--------------------------------
fs/nfsd/nfsfh.c | 11 ++++-----
fs/nfsd/vfs.c | 9 +++----
3 files changed, 32 insertions(+), 46 deletions(-)
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index c518421..d4accdc 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -739,16 +739,18 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv,
struct cache_req *reqp)
int err;
if (!clp)
- return NULL;
+ return ERR_PTR(-ENOENT);
key.ek_client = clp;
key.ek_fsidtype = fsid_type;
memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
ek = svc_expkey_lookup(&key);
- if (ek != NULL)
- if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
- ek = ERR_PTR(err);
+ if (ek == NULL)
+ return ERR_PTR(-ENOMEM);
+ err = cache_check(&svc_expkey_cache, &ek->h, reqp);
+ if (err)
+ return ERR_PTR(err);
return ek;
}
@@ -809,30 +811,21 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
struct dentry *dentry,
struct cache_req *reqp)
{
struct svc_export *exp, key;
+ int err;
if (!clp)
- return NULL;
+ return ERR_PTR(-ENOENT);
key.ex_client = clp;
key.ex_mnt = mnt;
key.ex_dentry = dentry;
exp = svc_export_lookup(&key);
- if (exp != NULL) {
- int err;
-
- err = cache_check(&svc_export_cache, &exp->h, reqp);
- switch (err) {
- case 0: break;
- case -EAGAIN:
- case -ETIMEDOUT:
- exp = ERR_PTR(err);
- break;
- default:
- exp = NULL;
- }
- }
-
+ if (exp == NULL)
+ return ERR_PTR(-ENOMEM);
+ err = cache_check(&svc_export_cache, &exp->h, reqp);
+ if (err)
+ return ERR_PTR(err);
return exp;
}
@@ -848,7 +841,7 @@ exp_parent(svc_client *clp, struct vfsmount *mnt, struct
dentry *dentry,
dget(dentry);
exp = exp_get_by_name(clp, mnt, dentry, reqp);
- while (exp == NULL && !IS_ROOT(dentry)) {
+ while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
struct dentry *parent;
parent = dget_parent(dentry);
@@ -901,7 +894,7 @@ static void exp_fsid_unhash(struct svc_export *exp)
return;
ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
- if (ek && !IS_ERR(ek)) {
+ if (!IS_ERR(ek)) {
ek->h.expiry_time = get_seconds()-1;
cache_put(&ek->h, &svc_expkey_cache);
}
@@ -939,7 +932,7 @@ static void exp_unhash(struct svc_export *exp)
struct inode *inode = exp->ex_dentry->d_inode;
ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
- if (ek && !IS_ERR(ek)) {
+ if (!IS_ERR(ek)) {
ek->h.expiry_time = get_seconds()-1;
cache_put(&ek->h, &svc_expkey_cache);
}
@@ -990,13 +983,12 @@ exp_export(struct nfsctl_export *nxp)
/* must make sure there won't be an ex_fsid clash */
if ((nxp->ex_flags & NFSEXP_FSID) &&
- (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
- !IS_ERR(fsid_key) &&
+ (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
fsid_key->ek_mnt &&
(fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
goto finish;
- if (exp) {
+ if (!IS_ERR(exp)) {
/* just a flags/id/fsid update */
exp_fsid_unhash(exp);
@@ -1105,7 +1097,7 @@ exp_unexport(struct nfsctl_export *nxp)
err = -EINVAL;
exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
path_release(&nd);
- if (!exp)
+ if (IS_ERR(exp))
goto out_domain;
exp_do_unexport(exp);
@@ -1150,10 +1142,6 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh
*f, int maxsize)
err = PTR_ERR(exp);
goto out;
}
- if (!exp) {
- dprintk("nfsd: exp_rootfh export not found.\n");
- goto out;
- }
/*
* fh must be initialized before calling fh_compose
@@ -1177,13 +1165,13 @@ exp_find(struct auth_domain *clp, int fsid_type, u32
*fsidv,
{
struct svc_export *exp;
struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
- if (!ek || IS_ERR(ek))
+ if (IS_ERR(ek))
return ERR_PTR(PTR_ERR(ek));
exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
cache_put(&ek->h, &svc_expkey_cache);
- if (!exp || IS_ERR(exp))
+ if (IS_ERR(exp))
return ERR_PTR(PTR_ERR(exp));
return exp;
}
@@ -1205,10 +1193,10 @@ exp_pseudoroot(struct auth_domain *clp, struct svc_fh
*fhp,
mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
exp = exp_find(clp, FSID_NUM, fsidv, creq);
+ if (PTR_ERR(exp) == -ENOENT)
+ return nfserr_perm;
if (IS_ERR(exp))
return nfserrno(PTR_ERR(exp));
- if (exp == NULL)
- return nfserr_perm;
rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
exp_put(exp);
return rv;
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index ecf9c36..89f9041 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -160,15 +160,14 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int
type, int access)
&rqstp->rq_chandle);
}
- if (IS_ERR(exp) && (PTR_ERR(exp) == -EAGAIN
- || PTR_ERR(exp) == -ETIMEDOUT)) {
- error = nfserrno(PTR_ERR(exp));
+ error = nfserr_stale;
+ if (PTR_ERR(exp) == -ENOENT)
goto out;
- }
- error = nfserr_stale;
- if (!exp || IS_ERR(exp))
+ if (IS_ERR(exp)) {
+ error = nfserrno(PTR_ERR(exp));
goto out;
+ }
/* Check if the request originated from a secure port. */
error = nfserr_perm;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 8d6b5c4..0a18149 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -192,15 +192,14 @@ nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp,
const char *name,
exp2 = exp_parent(exp->ex_client, mnt, dentry,
&rqstp->rq_chandle);
- if (IS_ERR(exp2)) {
+ if (PTR_ERR(exp2) == -ENOENT) {
+ dput(dentry);
+ dentry = dget(dparent);
+ } else if (IS_ERR(exp2)) {
host_err = PTR_ERR(exp2);
dput(dentry);
mntput(mnt);
goto out_nfserr;
- }
- if (!exp2) {
- dput(dentry);
- dentry = dget(dparent);
} else {
exp_put(exp);
exp = exp2;
-
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