summaryrefslogtreecommitdiff
path: root/fs/nfsd/vfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c145
1 files changed, 65 insertions, 80 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6fbd81ecb410..ff476e654b8f 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1135,96 +1135,37 @@ nfsd_check_ignore_resizing(struct iattr *iap)
iap->ia_valid &= ~ATTR_SIZE;
}
-/*
- * Create a file (regular, directory, device, fifo); UNIX sockets
- * not yet implemented.
- * If the response fh has been verified, the parent directory should
- * already be locked. Note that the parent directory is left locked.
- *
- * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
- */
+/* The parent directory should already be locked: */
__be32
-nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
+nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
char *fname, int flen, struct iattr *iap,
int type, dev_t rdev, struct svc_fh *resfhp)
{
- struct dentry *dentry, *dchild = NULL;
+ struct dentry *dentry, *dchild;
struct inode *dirp;
__be32 err;
__be32 err2;
int host_err;
- err = nfserr_perm;
- if (!flen)
- goto out;
- err = nfserr_exist;
- if (isdotent(fname, flen))
- goto out;
-
- err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
- if (err)
- goto out;
-
dentry = fhp->fh_dentry;
dirp = d_inode(dentry);
- err = nfserr_notdir;
- if (!dirp->i_op->lookup)
- goto out;
- /*
- * Check whether the response file handle has been verified yet.
- * If it has, the parent directory should already be locked.
- */
- if (!resfhp->fh_dentry) {
- host_err = fh_want_write(fhp);
- if (host_err)
- goto out_nfserr;
-
- /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
- fh_lock_nested(fhp, I_MUTEX_PARENT);
- dchild = lookup_one_len(fname, dentry, flen);
- host_err = PTR_ERR(dchild);
- if (IS_ERR(dchild))
- goto out_nfserr;
- err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
- if (err)
- goto out;
- } else {
- /* called from nfsd_proc_create */
- dchild = dget(resfhp->fh_dentry);
- if (!fhp->fh_locked) {
- /* not actually possible */
- printk(KERN_ERR
- "nfsd_create: parent %pd2 not locked!\n",
+ dchild = dget(resfhp->fh_dentry);
+ if (!fhp->fh_locked) {
+ WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n",
dentry);
- err = nfserr_io;
- goto out;
- }
- }
- /*
- * Make sure the child dentry is still negative ...
- */
- err = nfserr_exist;
- if (d_really_is_positive(dchild)) {
- dprintk("nfsd_create: dentry %pd/%pd not negative!\n",
- dentry, dchild);
- goto out;
+ err = nfserr_io;
+ goto out;
}
+ err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE);
+ if (err)
+ goto out;
+
if (!(iap->ia_valid & ATTR_MODE))
iap->ia_mode = 0;
iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
- err = nfserr_inval;
- if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
- printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
- type);
- goto out;
- }
-
- /*
- * Get the dir op function pointer.
- */
err = 0;
host_err = 0;
switch (type) {
@@ -1242,6 +1183,10 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
case S_IFSOCK:
host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
break;
+ default:
+ printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
+ type);
+ host_err = -EINVAL;
}
if (host_err < 0)
goto out_nfserr;
@@ -1251,7 +1196,7 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
/*
* nfsd_create_setattr already committed the child. Transactional
* filesystems had a chance to commit changes for both parent and
- * child * simultaneously making the following commit_metadata a
+ * child simultaneously making the following commit_metadata a
* noop.
*/
err2 = nfserrno(commit_metadata(fhp));
@@ -1263,8 +1208,7 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (!err)
err = fh_update(resfhp);
out:
- if (dchild && !IS_ERR(dchild))
- dput(dchild);
+ dput(dchild);
return err;
out_nfserr:
@@ -1272,6 +1216,53 @@ out_nfserr:
goto out;
}
+/*
+ * Create a filesystem object (regular, directory, special).
+ * Note that the parent directory is left locked.
+ *
+ * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
+ */
+__be32
+nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ char *fname, int flen, struct iattr *iap,
+ int type, dev_t rdev, struct svc_fh *resfhp)
+{
+ struct dentry *dentry, *dchild = NULL;
+ struct inode *dirp;
+ __be32 err;
+ int host_err;
+
+ if (isdotent(fname, flen))
+ return nfserr_exist;
+
+ err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP);
+ if (err)
+ return err;
+
+ dentry = fhp->fh_dentry;
+ dirp = d_inode(dentry);
+
+ host_err = fh_want_write(fhp);
+ if (host_err)
+ return nfserrno(host_err);
+
+ fh_lock_nested(fhp, I_MUTEX_PARENT);
+ dchild = lookup_one_len(fname, dentry, flen);
+ host_err = PTR_ERR(dchild);
+ if (IS_ERR(dchild))
+ return nfserrno(host_err);
+ err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
+ /*
+ * We unconditionally drop our ref to dchild as fh_compose will have
+ * already grabbed its own ref for it.
+ */
+ dput(dchild);
+ if (err)
+ return err;
+ return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type,
+ rdev, resfhp);
+}
+
#ifdef CONFIG_NFSD_V3
/*
@@ -1304,12 +1295,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
dentry = fhp->fh_dentry;
dirp = d_inode(dentry);
- /* Get all the sanity checks out of the way before
- * we lock the parent. */
- err = nfserr_notdir;
- if (!dirp->i_op->lookup)
- goto out;
-
host_err = fh_want_write(fhp);
if (host_err)
goto out_nfserr;