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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e18275ae55
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
446 lines
12 KiB
C
446 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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/*
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* Linux VFS namei operations.
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*/
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#include "protocol.h"
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#include "orangefs-kernel.h"
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/*
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* Get a newly allocated inode to go with a negative dentry.
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*/
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static int orangefs_create(struct mnt_idmap *idmap,
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struct inode *dir,
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struct dentry *dentry,
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umode_t mode,
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bool exclusive)
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{
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struct orangefs_inode_s *parent = ORANGEFS_I(dir);
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struct orangefs_kernel_op_s *new_op;
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struct orangefs_object_kref ref;
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struct inode *inode;
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struct iattr iattr;
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int ret;
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gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
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__func__,
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dentry);
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new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.create.parent_refn = parent->refn;
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fill_default_sys_attrs(new_op->upcall.req.create.attributes,
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ORANGEFS_TYPE_METAFILE, mode);
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strncpy(new_op->upcall.req.create.d_name,
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dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
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ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
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__func__,
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dentry,
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&new_op->downcall.resp.create.refn.khandle,
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new_op->downcall.resp.create.refn.fs_id,
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new_op,
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ret);
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if (ret < 0)
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goto out;
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ref = new_op->downcall.resp.create.refn;
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inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0, &ref);
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if (IS_ERR(inode)) {
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gossip_err("%s: Failed to allocate inode for file :%pd:\n",
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__func__,
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dentry);
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ret = PTR_ERR(inode);
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goto out;
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}
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: Assigned inode :%pU: for file :%pd:\n",
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__func__,
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get_khandle_from_ino(inode),
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dentry);
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d_instantiate_new(dentry, inode);
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orangefs_set_timeout(dentry);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: dentry instantiated for %pd\n",
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__func__,
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dentry);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
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iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
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__orangefs_setattr(dir, &iattr);
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ret = 0;
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out:
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op_release(new_op);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: %pd: returning %d\n",
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__func__,
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dentry,
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ret);
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return ret;
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}
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/*
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* Attempt to resolve an object name (dentry->d_name), parent handle, and
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* fsid into a handle for the object.
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*/
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static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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struct orangefs_inode_s *parent = ORANGEFS_I(dir);
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struct orangefs_kernel_op_s *new_op;
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struct inode *inode;
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int ret = -EINVAL;
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/*
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* in theory we could skip a lookup here (if the intent is to
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* create) in order to avoid a potentially failed lookup, but
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* leaving it in can skip a valid lookup and try to create a file
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* that already exists (e.g. the vfs already handles checking for
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* -EEXIST on O_EXCL opens, which is broken if we skip this lookup
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* in the create path)
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*/
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gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
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__func__, dentry);
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if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
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return ERR_PTR(-ENAMETOOLONG);
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new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
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if (!new_op)
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return ERR_PTR(-ENOMEM);
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new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
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gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
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__FILE__,
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__func__,
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__LINE__,
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&parent->refn.khandle);
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new_op->upcall.req.lookup.parent_refn = parent->refn;
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strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
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ORANGEFS_NAME_MAX - 1);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: doing lookup on %s under %pU,%d\n",
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__func__,
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new_op->upcall.req.lookup.d_name,
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&new_op->upcall.req.lookup.parent_refn.khandle,
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new_op->upcall.req.lookup.parent_refn.fs_id);
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ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Lookup Got %pU, fsid %d (ret=%d)\n",
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&new_op->downcall.resp.lookup.refn.khandle,
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new_op->downcall.resp.lookup.refn.fs_id,
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ret);
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if (ret == 0) {
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orangefs_set_timeout(dentry);
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inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
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} else if (ret == -ENOENT) {
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inode = NULL;
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} else {
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/* must be a non-recoverable error */
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inode = ERR_PTR(ret);
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}
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op_release(new_op);
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return d_splice_alias(inode, dentry);
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}
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/* return 0 on success; non-zero otherwise */
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static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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struct orangefs_inode_s *parent = ORANGEFS_I(dir);
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struct orangefs_kernel_op_s *new_op;
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struct iattr iattr;
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int ret;
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: called on %pd\n"
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" (inode %pU): Parent is %pU | fs_id %d\n",
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__func__,
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dentry,
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get_khandle_from_ino(inode),
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&parent->refn.khandle,
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parent->refn.fs_id);
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new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.remove.parent_refn = parent->refn;
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strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
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ORANGEFS_NAME_MAX - 1);
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ret = service_operation(new_op, "orangefs_unlink",
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get_interruptible_flag(inode));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: service_operation returned:%d:\n",
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__func__,
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ret);
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op_release(new_op);
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if (!ret) {
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drop_nlink(inode);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
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iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
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__orangefs_setattr(dir, &iattr);
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}
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return ret;
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}
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static int orangefs_symlink(struct mnt_idmap *idmap,
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struct inode *dir,
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struct dentry *dentry,
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const char *symname)
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{
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struct orangefs_inode_s *parent = ORANGEFS_I(dir);
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struct orangefs_kernel_op_s *new_op;
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struct orangefs_object_kref ref;
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struct inode *inode;
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struct iattr iattr;
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int mode = 0755;
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int ret;
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gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
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if (!symname)
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return -EINVAL;
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if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
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return -ENAMETOOLONG;
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new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.sym.parent_refn = parent->refn;
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fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
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ORANGEFS_TYPE_SYMLINK,
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mode);
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strncpy(new_op->upcall.req.sym.entry_name,
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dentry->d_name.name,
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ORANGEFS_NAME_MAX - 1);
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strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX - 1);
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ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
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&new_op->downcall.resp.sym.refn.khandle,
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new_op->downcall.resp.sym.refn.fs_id, ret);
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if (ret < 0) {
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: failed with error code %d\n",
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__func__, ret);
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goto out;
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}
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ref = new_op->downcall.resp.sym.refn;
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inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0, &ref);
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if (IS_ERR(inode)) {
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gossip_err
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("*** Failed to allocate orangefs symlink inode\n");
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ret = PTR_ERR(inode);
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goto out;
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}
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/*
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* This is necessary because orangefs_inode_getattr will not
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* re-read symlink size as it is impossible for it to change.
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* Invalidating the cache does not help. orangefs_new_inode
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* does not set the correct size (it does not know symname).
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*/
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inode->i_size = strlen(symname);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Assigned symlink inode new number of %pU\n",
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get_khandle_from_ino(inode));
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d_instantiate_new(dentry, inode);
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orangefs_set_timeout(dentry);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Inode (Symlink) %pU -> %pd\n",
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get_khandle_from_ino(inode),
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dentry);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
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iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
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__orangefs_setattr(dir, &iattr);
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ret = 0;
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out:
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op_release(new_op);
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return ret;
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}
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static int orangefs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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struct orangefs_inode_s *parent = ORANGEFS_I(dir);
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struct orangefs_kernel_op_s *new_op;
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struct orangefs_object_kref ref;
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struct inode *inode;
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struct iattr iattr;
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int ret;
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new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
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if (!new_op)
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return -ENOMEM;
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new_op->upcall.req.mkdir.parent_refn = parent->refn;
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fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
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ORANGEFS_TYPE_DIRECTORY, mode);
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strncpy(new_op->upcall.req.mkdir.d_name,
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dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
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ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Mkdir Got ORANGEFS handle %pU on fsid %d\n",
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&new_op->downcall.resp.mkdir.refn.khandle,
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new_op->downcall.resp.mkdir.refn.fs_id);
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if (ret < 0) {
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gossip_debug(GOSSIP_NAME_DEBUG,
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"%s: failed with error code %d\n",
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__func__, ret);
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goto out;
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}
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ref = new_op->downcall.resp.mkdir.refn;
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inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0, &ref);
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if (IS_ERR(inode)) {
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gossip_err("*** Failed to allocate orangefs dir inode\n");
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ret = PTR_ERR(inode);
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goto out;
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}
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Assigned dir inode new number of %pU\n",
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get_khandle_from_ino(inode));
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d_instantiate_new(dentry, inode);
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orangefs_set_timeout(dentry);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Inode (Directory) %pU -> %pd\n",
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get_khandle_from_ino(inode),
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dentry);
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/*
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* NOTE: we have no good way to keep nlink consistent for directories
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* across clients; keep constant at 1.
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*/
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
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iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
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__orangefs_setattr(dir, &iattr);
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out:
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op_release(new_op);
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return ret;
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}
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static int orangefs_rename(struct mnt_idmap *idmap,
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struct inode *old_dir,
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struct dentry *old_dentry,
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struct inode *new_dir,
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struct dentry *new_dentry,
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unsigned int flags)
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{
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struct orangefs_kernel_op_s *new_op;
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struct iattr iattr;
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int ret;
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if (flags)
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return -EINVAL;
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gossip_debug(GOSSIP_NAME_DEBUG,
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"orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
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old_dentry, new_dentry, d_count(new_dentry));
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
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iattr.ia_mtime = iattr.ia_ctime = current_time(new_dir);
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__orangefs_setattr(new_dir, &iattr);
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new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
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if (!new_op)
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return -EINVAL;
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new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
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new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
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strncpy(new_op->upcall.req.rename.d_old_name,
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old_dentry->d_name.name,
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ORANGEFS_NAME_MAX - 1);
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strncpy(new_op->upcall.req.rename.d_new_name,
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new_dentry->d_name.name,
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ORANGEFS_NAME_MAX - 1);
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ret = service_operation(new_op,
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"orangefs_rename",
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get_interruptible_flag(old_dentry->d_inode));
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gossip_debug(GOSSIP_NAME_DEBUG,
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"orangefs_rename: got downcall status %d\n",
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ret);
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if (new_dentry->d_inode)
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new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
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op_release(new_op);
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return ret;
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}
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/* ORANGEFS implementation of VFS inode operations for directories */
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const struct inode_operations orangefs_dir_inode_operations = {
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.lookup = orangefs_lookup,
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.get_inode_acl = orangefs_get_acl,
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.set_acl = orangefs_set_acl,
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.create = orangefs_create,
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.unlink = orangefs_unlink,
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.symlink = orangefs_symlink,
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.mkdir = orangefs_mkdir,
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.rmdir = orangefs_unlink,
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.rename = orangefs_rename,
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.setattr = orangefs_setattr,
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.getattr = orangefs_getattr,
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.listxattr = orangefs_listxattr,
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.permission = orangefs_permission,
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.update_time = orangefs_update_time,
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};
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