mirror of https://gitee.com/openkylin/linux.git
493 lines
13 KiB
C
493 lines
13 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 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);
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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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op_release(new_op);
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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(dentry, inode);
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unlock_new_inode(inode);
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orangefs_set_timeout(dentry);
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ORANGEFS_I(inode)->getattr_time = jiffies - 1;
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ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
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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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dir->i_mtime = dir->i_ctime = current_time(dir);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME;
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orangefs_inode_setattr(dir, &iattr);
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mark_inode_dirty_sync(dir);
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ret = 0;
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out:
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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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struct dentry *res;
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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);
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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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if (ret == -ENOENT) {
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/*
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* if no inode was found, add a negative dentry to
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* dcache anyway; if we don't, we don't hold expected
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* lookup semantics and we most noticeably break
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* during directory renames.
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*
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* however, if the operation failed or exited, do not
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* add the dentry (e.g. in the case that a touch is
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* issued on a file that already exists that was
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* interrupted during this lookup -- no need to add
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* another negative dentry for an existing file)
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*/
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gossip_debug(GOSSIP_NAME_DEBUG,
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"orangefs_lookup: Adding *negative* dentry "
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"%p for %pd\n",
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dentry,
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dentry);
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d_add(dentry, NULL);
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res = NULL;
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goto out;
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}
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/* must be a non-recoverable error */
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res = ERR_PTR(ret);
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goto out;
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}
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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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if (IS_ERR(inode)) {
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gossip_debug(GOSSIP_NAME_DEBUG,
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"error %ld from iget\n", PTR_ERR(inode));
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res = ERR_CAST(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:%s:%d "
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"Found good inode [%lu] with count [%d]\n",
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__FILE__,
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__func__,
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__LINE__,
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inode->i_ino,
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(int)atomic_read(&inode->i_count));
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/* update dentry/inode pair into dcache */
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res = d_splice_alias(inode, dentry);
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gossip_debug(GOSSIP_NAME_DEBUG,
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"Lookup success (inode ct = %d)\n",
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(int)atomic_read(&inode->i_count));
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out:
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op_release(new_op);
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return res;
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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);
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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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dir->i_mtime = dir->i_ctime = current_time(dir);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME;
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orangefs_inode_setattr(dir, &iattr);
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mark_inode_dirty_sync(dir);
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}
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return ret;
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}
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static int orangefs_symlink(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 = 755;
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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);
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strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX);
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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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op_release(new_op);
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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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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(dentry, inode);
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unlock_new_inode(inode);
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orangefs_set_timeout(dentry);
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ORANGEFS_I(inode)->getattr_time = jiffies - 1;
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ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
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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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dir->i_mtime = dir->i_ctime = current_time(dir);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME;
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orangefs_inode_setattr(dir, &iattr);
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mark_inode_dirty_sync(dir);
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ret = 0;
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out:
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return ret;
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}
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static int orangefs_mkdir(struct inode *dir, 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);
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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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op_release(new_op);
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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(dentry, inode);
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unlock_new_inode(inode);
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orangefs_set_timeout(dentry);
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ORANGEFS_I(inode)->getattr_time = jiffies - 1;
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ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
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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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dir->i_mtime = dir->i_ctime = current_time(dir);
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memset(&iattr, 0, sizeof iattr);
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iattr.ia_valid |= ATTR_MTIME;
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orangefs_inode_setattr(dir, &iattr);
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mark_inode_dirty_sync(dir);
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out:
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return ret;
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}
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static int orangefs_rename(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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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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ORANGEFS_I(new_dentry->d_parent->d_inode)->getattr_time = jiffies - 1;
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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);
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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);
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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_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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