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Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c165
1 files changed, 82 insertions, 83 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index c8bd9c3be7f..d586117fa94 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -480,7 +480,7 @@ set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
if (buf == NULL)
goto out;
- len = posix_acl_to_xattr(pacl, buf, buflen);
+ len = posix_acl_to_xattr(&init_user_ns, pacl, buf, buflen);
if (len < 0) {
error = len;
goto out;
@@ -549,7 +549,7 @@ _get_posix_acl(struct dentry *dentry, char *key)
if (buflen <= 0)
return ERR_PTR(buflen);
- pacl = posix_acl_from_xattr(buf, buflen);
+ pacl = posix_acl_from_xattr(&init_user_ns, buf, buflen);
kfree(buf);
return pacl;
}
@@ -745,7 +745,7 @@ __be32
nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
int may_flags, struct file **filp)
{
- struct dentry *dentry;
+ struct path path;
struct inode *inode;
int flags = O_RDONLY|O_LARGEFILE;
__be32 err;
@@ -757,13 +757,22 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
* If we get here, then the client has already done an "open",
* and (hopefully) checked permission - so allow OWNER_OVERRIDE
* in case a chmod has now revoked permission.
+ *
+ * Arguably we should also allow the owner override for
+ * directories, but we never have and it doesn't seem to have
+ * caused anyone a problem. If we were to change this, note
+ * also that our filldir callbacks would need a variant of
+ * lookup_one_len that doesn't check permissions.
*/
- err = fh_verify(rqstp, fhp, type, may_flags | NFSD_MAY_OWNER_OVERRIDE);
+ if (type == S_IFREG)
+ may_flags |= NFSD_MAY_OWNER_OVERRIDE;
+ err = fh_verify(rqstp, fhp, type, may_flags);
if (err)
goto out;
- dentry = fhp->fh_dentry;
- inode = dentry->d_inode;
+ path.mnt = fhp->fh_export->ex_path.mnt;
+ path.dentry = fhp->fh_dentry;
+ inode = path.dentry->d_inode;
/* Disallow write access to files with the append-only bit set
* or any access when mandatory locking enabled
@@ -792,8 +801,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
else
flags = O_WRONLY|O_LARGEFILE;
}
- *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
- flags, current_cred());
+ *filp = dentry_open(&path, flags, current_cred());
if (IS_ERR(*filp))
host_err = PTR_ERR(*filp);
else {
@@ -878,7 +886,7 @@ nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
struct svc_rqst *rqstp = sd->u.data;
- struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
+ struct page **pp = rqstp->rq_next_page;
struct page *page = buf->page;
size_t size;
@@ -886,17 +894,15 @@ nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
if (rqstp->rq_res.page_len == 0) {
get_page(page);
- put_page(*pp);
- *pp = page;
- rqstp->rq_resused++;
+ put_page(*rqstp->rq_next_page);
+ *(rqstp->rq_next_page++) = page;
rqstp->rq_res.page_base = buf->offset;
rqstp->rq_res.page_len = size;
} else if (page != pp[-1]) {
get_page(page);
- if (*pp)
- put_page(*pp);
- *pp = page;
- rqstp->rq_resused++;
+ if (*rqstp->rq_next_page)
+ put_page(*rqstp->rq_next_page);
+ *(rqstp->rq_next_page++) = page;
rqstp->rq_res.page_len += size;
} else
rqstp->rq_res.page_len += size;
@@ -928,7 +934,7 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
.u.data = rqstp,
};
- rqstp->rq_resused = 1;
+ rqstp->rq_next_page = rqstp->rq_respages + 1;
host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
} else {
oldfs = get_fs();
@@ -1012,28 +1018,10 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
inode = dentry->d_inode;
exp = fhp->fh_export;
- /*
- * Request sync writes if
- * - the sync export option has been set, or
- * - the client requested O_SYNC behavior (NFSv3 feature).
- * - The file system doesn't support fsync().
- * When NFSv2 gathered writes have been configured for this volume,
- * flushing the data to disk is handled separately below.
- */
use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
- if (!file->f_op->fsync) {/* COMMIT3 cannot work */
- stable = 2;
- *stablep = 2; /* FILE_SYNC */
- }
-
if (!EX_ISSYNC(exp))
stable = 0;
- if (stable && !use_wgather) {
- spin_lock(&file->f_lock);
- file->f_flags |= O_SYNC;
- spin_unlock(&file->f_lock);
- }
/* Write the data. */
oldfs = get_fs(); set_fs(KERNEL_DS);
@@ -1049,8 +1037,12 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
if (inode->i_mode & (S_ISUID | S_ISGID))
kill_suid(dentry);
- if (stable && use_wgather)
- host_err = wait_for_concurrent_writes(file);
+ if (stable) {
+ if (use_wgather)
+ host_err = wait_for_concurrent_writes(file);
+ else
+ host_err = vfs_fsync_range(file, offset, offset+*cnt, 0);
+ }
out_nfserr:
dprintk("nfsd: write complete host_err=%d\n", host_err);
@@ -1276,6 +1268,10 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
* 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);
@@ -1319,17 +1315,14 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
goto out;
}
- host_err = fh_want_write(fhp);
- if (host_err)
- goto out_nfserr;
-
/*
* Get the dir op function pointer.
*/
err = 0;
+ host_err = 0;
switch (type) {
case S_IFREG:
- host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+ host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
if (!host_err)
nfsd_check_ignore_resizing(iap);
break;
@@ -1343,10 +1336,8 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
break;
}
- if (host_err < 0) {
- fh_drop_write(fhp);
+ if (host_err < 0)
goto out_nfserr;
- }
err = nfsd_create_setattr(rqstp, resfhp, iap);
@@ -1358,7 +1349,6 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
err2 = nfserrno(commit_metadata(fhp));
if (err2)
err = err2;
- fh_drop_write(fhp);
/*
* Update the file handle to get the new inode info.
*/
@@ -1417,6 +1407,11 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
err = nfserr_notdir;
if (!dirp->i_op->lookup)
goto out;
+
+ host_err = fh_want_write(fhp);
+ if (host_err)
+ goto out_nfserr;
+
fh_lock_nested(fhp, I_MUTEX_PARENT);
/*
@@ -1449,9 +1444,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
v_atime = verifier[1]&0x7fffffff;
}
- host_err = fh_want_write(fhp);
- if (host_err)
- goto out_nfserr;
if (dchild->d_inode) {
err = 0;
@@ -1477,13 +1469,19 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
case NFS3_CREATE_EXCLUSIVE:
if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
&& dchild->d_inode->i_atime.tv_sec == v_atime
- && dchild->d_inode->i_size == 0 )
+ && dchild->d_inode->i_size == 0 ) {
+ if (created)
+ *created = 1;
break;
+ }
case NFS4_CREATE_EXCLUSIVE4_1:
if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
&& dchild->d_inode->i_atime.tv_sec == v_atime
- && dchild->d_inode->i_size == 0 )
+ && dchild->d_inode->i_size == 0 ) {
+ if (created)
+ *created = 1;
goto set_attr;
+ }
/* fallthru */
case NFS3_CREATE_GUARDED:
err = nfserr_exist;
@@ -1492,7 +1490,7 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
goto out;
}
- host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+ host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
if (host_err < 0) {
fh_drop_write(fhp);
goto out_nfserr;
@@ -1522,7 +1520,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (!err)
err = nfserrno(commit_metadata(fhp));
- fh_drop_write(fhp);
/*
* Update the filehandle to get the new inode info.
*/
@@ -1533,6 +1530,7 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
fh_unlock(fhp);
if (dchild && !IS_ERR(dchild))
dput(dchild);
+ fh_drop_write(fhp);
return err;
out_nfserr:
@@ -1573,7 +1571,7 @@ nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
*/
oldfs = get_fs(); set_fs(KERNEL_DS);
- host_err = inode->i_op->readlink(path.dentry, buf, *lenp);
+ host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp);
set_fs(oldfs);
if (host_err < 0)
@@ -1613,6 +1611,11 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
if (err)
goto out;
+
+ host_err = fh_want_write(fhp);
+ if (host_err)
+ goto out_nfserr;
+
fh_lock(fhp);
dentry = fhp->fh_dentry;
dnew = lookup_one_len(fname, dentry, flen);
@@ -1620,10 +1623,6 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (IS_ERR(dnew))
goto out_nfserr;
- host_err = fh_want_write(fhp);
- if (host_err)
- goto out_nfserr;
-
if (unlikely(path[plen] != 0)) {
char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
if (path_alloced == NULL)
@@ -1683,6 +1682,12 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
if (isdotent(name, len))
goto out;
+ host_err = fh_want_write(tfhp);
+ if (host_err) {
+ err = nfserrno(host_err);
+ goto out;
+ }
+
fh_lock_nested(ffhp, I_MUTEX_PARENT);
ddir = ffhp->fh_dentry;
dirp = ddir->d_inode;
@@ -1694,18 +1699,13 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
dold = tfhp->fh_dentry;
- host_err = fh_want_write(tfhp);
- if (host_err) {
- err = nfserrno(host_err);
- goto out_dput;
- }
err = nfserr_noent;
if (!dold->d_inode)
- goto out_drop_write;
+ goto out_dput;
host_err = nfsd_break_lease(dold->d_inode);
if (host_err) {
err = nfserrno(host_err);
- goto out_drop_write;
+ goto out_dput;
}
host_err = vfs_link(dold, dirp, dnew);
if (!host_err) {
@@ -1718,12 +1718,11 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
else
err = nfserrno(host_err);
}
-out_drop_write:
- fh_drop_write(tfhp);
out_dput:
dput(dnew);
out_unlock:
fh_unlock(ffhp);
+ fh_drop_write(tfhp);
out:
return err;
@@ -1766,6 +1765,12 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
goto out;
+ host_err = fh_want_write(ffhp);
+ if (host_err) {
+ err = nfserrno(host_err);
+ goto out;
+ }
+
/* cannot use fh_lock as we need deadlock protective ordering
* so do it by hand */
trap = lock_rename(tdentry, fdentry);
@@ -1796,17 +1801,14 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
host_err = -EXDEV;
if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
goto out_dput_new;
- host_err = fh_want_write(ffhp);
- if (host_err)
- goto out_dput_new;
host_err = nfsd_break_lease(odentry->d_inode);
if (host_err)
- goto out_drop_write;
+ goto out_dput_new;
if (ndentry->d_inode) {
host_err = nfsd_break_lease(ndentry->d_inode);
if (host_err)
- goto out_drop_write;
+ goto out_dput_new;
}
host_err = vfs_rename(fdir, odentry, tdir, ndentry);
if (!host_err) {
@@ -1814,8 +1816,6 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
if (!host_err)
host_err = commit_metadata(ffhp);
}
-out_drop_write:
- fh_drop_write(ffhp);
out_dput_new:
dput(ndentry);
out_dput_old:
@@ -1831,6 +1831,7 @@ out_drop_write:
fill_post_wcc(tfhp);
unlock_rename(tdentry, fdentry);
ffhp->fh_locked = tfhp->fh_locked = 0;
+ fh_drop_write(ffhp);
out:
return err;
@@ -1856,6 +1857,10 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
if (err)
goto out;
+ host_err = fh_want_write(fhp);
+ if (host_err)
+ goto out_nfserr;
+
fh_lock_nested(fhp, I_MUTEX_PARENT);
dentry = fhp->fh_dentry;
dirp = dentry->d_inode;
@@ -1874,21 +1879,15 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
if (!type)
type = rdentry->d_inode->i_mode & S_IFMT;
- host_err = fh_want_write(fhp);
- if (host_err)
- goto out_put;
-
host_err = nfsd_break_lease(rdentry->d_inode);
if (host_err)
- goto out_drop_write;
+ goto out_put;
if (type != S_IFDIR)
host_err = vfs_unlink(dirp, rdentry);
else
host_err = vfs_rmdir(dirp, rdentry);
if (!host_err)
host_err = commit_metadata(fhp);
-out_drop_write:
- fh_drop_write(fhp);
out_put:
dput(rdentry);
@@ -2255,7 +2254,7 @@ nfsd_get_posix_acl(struct svc_fh *fhp, int type)
if (size < 0)
return ERR_PTR(size);
- acl = posix_acl_from_xattr(value, size);
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
kfree(value);
return acl;
}
@@ -2288,7 +2287,7 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
value = kmalloc(size, GFP_KERNEL);
if (!value)
return -ENOMEM;
- error = posix_acl_to_xattr(acl, value, size);
+ error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
if (error < 0)
goto getout;
size = error;