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* linux/fs/9p/vfs_inode.c
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* This file contains vfs inode ops for the 9P2000 protocol.
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/inet.h>
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#include <linux/namei.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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static const struct inode_operations v9fs_dir_inode_operations;
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static const struct inode_operations v9fs_dir_inode_operations_dotu;
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static const struct inode_operations v9fs_file_inode_operations;
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static const struct inode_operations v9fs_symlink_inode_operations;
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* unixmode2p9mode - convert unix mode bits to plan 9
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* @v9ses: v9fs session information
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* @mode: mode to convert
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static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
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if (v9fs_proto_dotu(v9ses)) {
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if (v9ses->nodev == 0) {
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res |= P9_DMNAMEDPIPE;
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if ((mode & S_ISUID) == S_ISUID)
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if ((mode & S_ISGID) == S_ISGID)
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if ((mode & S_ISVTX) == S_ISVTX)
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if ((mode & P9_DMLINK))
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* p9mode2unixmode- convert plan9 mode bits to unix mode bits
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* @v9ses: v9fs session information
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* @stat: p9_wstat from which mode need to be derived
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* @rdev: major number, minor number in case of device files.
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static int p9mode2unixmode(struct v9fs_session_info *v9ses,
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struct p9_wstat *stat, dev_t *rdev)
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int mode = stat->mode;
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res = mode & S_IALLUGO;
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if ((mode & P9_DMDIR) == P9_DMDIR)
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else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
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else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0)) {
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char type = 0, ext[32];
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int major = -1, minor = -1;
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strncpy(ext, stat->extension, sizeof(ext));
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sscanf(ext, "%c %u %u", &type, &major, &minor);
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P9_DPRINTK(P9_DEBUG_ERROR,
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"Unknown special type %c %s\n", type,
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*rdev = MKDEV(major, minor);
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if (v9fs_proto_dotu(v9ses)) {
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if ((mode & P9_DMSETUID) == P9_DMSETUID)
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if ((mode & P9_DMSETGID) == P9_DMSETGID)
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if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
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* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
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* @uflags: flags to convert
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* @extended: if .u extensions are active
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int v9fs_uflags2omode(int uflags, int extended)
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if (uflags & O_TRUNC)
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if (uflags & O_APPEND)
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* v9fs_blank_wstat - helper function to setup a 9P stat structure
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* @wstat: structure to initialize
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v9fs_blank_wstat(struct p9_wstat *wstat)
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wstat->qid.type = ~0;
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wstat->qid.version = ~0;
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*((long long *)&wstat->qid.path) = ~0;
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wstat->extension = NULL;
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* v9fs_alloc_inode - helper function to allocate an inode
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struct inode *v9fs_alloc_inode(struct super_block *sb)
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struct v9fs_inode *v9inode;
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v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
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#ifdef CONFIG_9P_FSCACHE
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v9inode->fscache = NULL;
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spin_lock_init(&v9inode->fscache_lock);
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v9inode->writeback_fid = NULL;
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v9inode->cache_validity = 0;
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mutex_init(&v9inode->v_mutex);
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return &v9inode->vfs_inode;
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* v9fs_destroy_inode - destroy an inode
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static void v9fs_i_callback(struct rcu_head *head)
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struct inode *inode = container_of(head, struct inode, i_rcu);
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INIT_LIST_HEAD(&inode->i_dentry);
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kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
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void v9fs_destroy_inode(struct inode *inode)
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call_rcu(&inode->i_rcu, v9fs_i_callback);
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, int mode, dev_t rdev)
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inode_init_owner(inode, NULL, mode);
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inode->i_rdev = rdev;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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inode->i_mapping->a_ops = &v9fs_addr_operations;
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switch (mode & S_IFMT) {
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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} else if (v9fs_proto_dotu(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations;
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P9_DPRINTK(P9_DEBUG_ERROR,
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"special files without extended mode\n");
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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&v9fs_cached_file_operations_dotl;
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inode->i_fop = &v9fs_file_operations_dotl;
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inode->i_op = &v9fs_file_inode_operations;
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inode->i_fop = &v9fs_cached_file_operations;
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inode->i_fop = &v9fs_file_operations;
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if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
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P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
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"legacy protocol.\n");
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if (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_symlink_inode_operations_dotl;
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inode->i_op = &v9fs_symlink_inode_operations;
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if (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_dir_inode_operations_dotl;
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else if (v9fs_proto_dotu(v9ses))
327
inode->i_op = &v9fs_dir_inode_operations_dotu;
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inode->i_op = &v9fs_dir_inode_operations;
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if (v9fs_proto_dotl(v9ses))
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inode->i_fop = &v9fs_dir_operations_dotl;
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inode->i_fop = &v9fs_dir_operations;
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P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
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mode, mode & S_IFMT);
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* v9fs_get_inode - helper function to setup an inode
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* @mode: mode to setup inode with
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struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev)
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
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inode = new_inode(sb);
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P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
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return ERR_PTR(-ENOMEM);
368
err = v9fs_init_inode(v9ses, inode, mode, rdev);
377
static struct v9fs_fid*
378
v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
382
struct v9fs_fid *ret;
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struct v9fs_fcall *fcall;
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nfid = v9fs_get_idpool(&v9ses->fidpool);
387
eprintk(KERN_WARNING, "no free fids available\n");
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return ERR_PTR(-ENOSPC);
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err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
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if (fcall && fcall->id == RWALK)
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PRINT_FCALL_ERROR("walk error", fcall);
399
v9fs_put_idpool(nfid, &v9ses->fidpool);
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ret = v9fs_fid_create(v9ses, nfid);
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err = v9fs_fid_insert(ret, dentry);
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v9fs_fid_destroy(ret);
420
v9fs_t_clunk(v9ses, nfid);
430
* v9fs_clear_inode - release an inode
431
* @inode: inode to release
434
void v9fs_evict_inode(struct inode *inode)
436
struct v9fs_inode *v9inode = V9FS_I(inode);
438
truncate_inode_pages(inode->i_mapping, 0);
439
end_writeback(inode);
440
filemap_fdatawrite(inode->i_mapping);
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#ifdef CONFIG_9P_FSCACHE
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v9fs_cache_inode_put_cookie(inode);
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/* clunk the fid stashed in writeback_fid */
446
if (v9inode->writeback_fid) {
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p9_client_clunk(v9inode->writeback_fid);
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v9inode->writeback_fid = NULL;
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static int v9fs_test_inode(struct inode *inode, void *data)
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_wstat *st = (struct p9_wstat *)data;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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umode = p9mode2unixmode(v9ses, st, &rdev);
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/* don't match inode of different type */
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if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
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/* compare qid details */
466
if (memcmp(&v9inode->qid.version,
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&st->qid.version, sizeof(v9inode->qid.version)))
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if (v9inode->qid.type != st->qid.type)
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static int v9fs_test_new_inode(struct inode *inode, void *data)
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static int v9fs_set_inode(struct inode *inode, void *data)
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_wstat *st = (struct p9_wstat *)data;
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memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
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static struct inode *v9fs_qid_iget(struct super_block *sb,
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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int (*test)(struct inode *, void *);
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test = v9fs_test_new_inode;
504
test = v9fs_test_inode;
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i_ino = v9fs_qid2ino(qid);
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inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
509
return ERR_PTR(-ENOMEM);
510
if (!(inode->i_state & I_NEW))
513
* initialize the inode with the stat info
514
* FIXME!! we may need support for stale inodes
517
inode->i_ino = i_ino;
518
umode = p9mode2unixmode(v9ses, st, &rdev);
519
retval = v9fs_init_inode(v9ses, inode, umode, rdev);
523
v9fs_stat2inode(st, inode, sb);
524
#ifdef CONFIG_9P_FSCACHE
525
v9fs_cache_inode_get_cookie(inode);
527
unlock_new_inode(inode);
530
unlock_new_inode(inode);
532
return ERR_PTR(retval);
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v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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struct super_block *sb, int new)
541
struct inode *inode = NULL;
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st = p9_client_stat(fid);
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inode = v9fs_qid_iget(sb, &st->qid, st, new);
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* v9fs_at_to_dotl_flags- convert Linux specific AT flags to
556
* @flags: flags to convert
558
static int v9fs_at_to_dotl_flags(int flags)
561
if (flags & AT_REMOVEDIR)
562
rflags |= P9_DOTL_AT_REMOVEDIR;
567
* v9fs_remove - helper function to remove files and directories
568
* @dir: directory inode that is being deleted
569
* @dentry: dentry that is being deleted
570
* @rmdir: removing a directory
574
static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
577
int retval = -EOPNOTSUPP;
578
struct p9_fid *v9fid, *dfid;
579
struct v9fs_session_info *v9ses;
581
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
584
v9ses = v9fs_inode2v9ses(dir);
585
inode = dentry->d_inode;
586
dfid = v9fs_fid_lookup(dentry->d_parent);
588
retval = PTR_ERR(dfid);
589
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
592
if (v9fs_proto_dotl(v9ses))
593
retval = p9_client_unlinkat(dfid, dentry->d_name.name,
594
v9fs_at_to_dotl_flags(flags));
595
if (retval == -EOPNOTSUPP) {
596
/* Try the one based on path */
597
v9fid = v9fs_fid_clone(dentry);
599
return PTR_ERR(v9fid);
600
retval = p9_client_remove(v9fid);
604
* directories on unlink should have zero
607
if (flags & AT_REMOVEDIR) {
613
v9fs_invalidate_inode_attr(inode);
614
v9fs_invalidate_inode_attr(dir);
620
* v9fs_create - Create a file
621
* @v9ses: session information
622
* @dir: directory that dentry is being created in
623
* @dentry: dentry that is being created
624
* @extension: 9p2000.u extension string to support devices, etc.
625
* @perm: create permissions
629
static struct p9_fid *
630
v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
631
struct dentry *dentry, char *extension, u32 perm, u8 mode)
635
struct p9_fid *dfid, *ofid, *fid;
638
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
643
name = (char *) dentry->d_name.name;
644
dfid = v9fs_fid_lookup(dentry->d_parent);
647
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
651
/* clone a fid to use for creation */
652
ofid = p9_client_walk(dfid, 0, NULL, 1);
655
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
659
err = p9_client_fcreate(ofid, name, perm, mode, extension);
661
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
665
/* now walk from the parent so we can get unopened fid */
666
fid = p9_client_walk(dfid, 1, &name, 1);
669
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
674
/* instantiate inode and assign the unopened fid to the dentry */
675
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
677
err = PTR_ERR(inode);
678
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
681
err = v9fs_fid_add(dentry, fid);
684
d_instantiate(dentry, inode);
688
p9_client_clunk(ofid);
691
p9_client_clunk(fid);
697
* v9fs_vfs_create - VFS hook to create files
698
* @dir: directory inode that is being created
699
* @dentry: dentry that is being deleted
700
* @mode: create permissions
701
* @nd: path information
706
v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
707
struct nameidata *nd)
713
struct v9fs_inode *v9inode;
714
struct v9fs_session_info *v9ses;
715
struct p9_fid *fid, *inode_fid;
719
v9ses = v9fs_inode2v9ses(dir);
720
perm = unixmode2p9mode(v9ses, mode);
722
flags = nd->intent.open.flags;
726
fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
727
v9fs_uflags2omode(flags,
728
v9fs_proto_dotu(v9ses)));
735
v9fs_invalidate_inode_attr(dir);
736
/* if we are opening a file, assign the open fid to the file */
738
v9inode = V9FS_I(dentry->d_inode);
739
mutex_lock(&v9inode->v_mutex);
740
if (v9ses->cache && !v9inode->writeback_fid &&
741
((flags & O_ACCMODE) != O_RDONLY)) {
743
* clone a fid and add it to writeback_fid
744
* we do it during open time instead of
745
* page dirty time via write_begin/page_mkwrite
746
* because we want write after unlink usecase
749
inode_fid = v9fs_writeback_fid(dentry);
750
if (IS_ERR(inode_fid)) {
751
err = PTR_ERR(inode_fid);
752
mutex_unlock(&v9inode->v_mutex);
755
v9inode->writeback_fid = (void *) inode_fid;
757
mutex_unlock(&v9inode->v_mutex);
758
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
764
filp->private_data = fid;
765
#ifdef CONFIG_9P_FSCACHE
767
v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
770
p9_client_clunk(fid);
776
p9_client_clunk(fid);
782
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory
783
* @dir: inode that is being unlinked
784
* @dentry: dentry that is being unlinked
785
* @mode: mode for new directory
789
static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
794
struct v9fs_session_info *v9ses;
796
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
798
v9ses = v9fs_inode2v9ses(dir);
799
perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
800
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
806
v9fs_invalidate_inode_attr(dir);
810
p9_client_clunk(fid);
816
* v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
817
* @dir: inode that is being walked from
818
* @dentry: dentry that is being walked to?
819
* @nameidata: path data
823
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
824
struct nameidata *nameidata)
827
struct super_block *sb;
828
struct v9fs_session_info *v9ses;
829
struct p9_fid *dfid, *fid;
834
P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
835
dir, dentry->d_name.name, dentry, nameidata);
837
if (dentry->d_name.len > NAME_MAX)
838
return ERR_PTR(-ENAMETOOLONG);
841
v9ses = v9fs_inode2v9ses(dir);
842
/* We can walk d_parent because we hold the dir->i_mutex */
843
dfid = v9fs_fid_lookup(dentry->d_parent);
845
return ERR_CAST(dfid);
847
name = (char *) dentry->d_name.name;
848
fid = p9_client_walk(dfid, 1, &name, 1);
850
result = PTR_ERR(fid);
851
if (result == -ENOENT) {
856
return ERR_PTR(result);
859
* Make sure we don't use a wrong inode due to parallel
860
* unlink. For cached mode create calls request for new
861
* inode. But with cache disabled, lookup should do this.
864
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
866
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
868
result = PTR_ERR(inode);
872
result = v9fs_fid_add(dentry, fid);
877
* If we had a rename on the server and a parallel lookup
878
* for the new name, then make sure we instantiate with
879
* the new name. ie look up for a/b, while on server somebody
880
* moved b under k and client parallely did a lookup for
883
res = d_materialise_unique(dentry, inode);
886
result = PTR_ERR(res);
890
p9_client_clunk(fid);
892
return ERR_PTR(result);
896
* v9fs_vfs_unlink - VFS unlink hook to delete an inode
897
* @i: inode that is being unlinked
898
* @d: dentry that is being unlinked
902
int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
904
return v9fs_remove(i, d, 0);
908
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory
909
* @i: inode that is being unlinked
910
* @d: dentry that is being unlinked
914
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
916
return v9fs_remove(i, d, AT_REMOVEDIR);
920
* v9fs_vfs_rename - VFS hook to rename an inode
921
* @old_dir: old dir inode
922
* @old_dentry: old dentry
923
* @new_dir: new dir inode
924
* @new_dentry: new dentry
929
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
930
struct inode *new_dir, struct dentry *new_dentry)
933
struct inode *old_inode;
934
struct inode *new_inode;
935
struct v9fs_session_info *v9ses;
936
struct p9_fid *oldfid;
937
struct p9_fid *olddirfid;
938
struct p9_fid *newdirfid;
939
struct p9_wstat wstat;
941
P9_DPRINTK(P9_DEBUG_VFS, "\n");
943
old_inode = old_dentry->d_inode;
944
new_inode = new_dentry->d_inode;
945
v9ses = v9fs_inode2v9ses(old_inode);
946
oldfid = v9fs_fid_lookup(old_dentry);
948
return PTR_ERR(oldfid);
950
olddirfid = v9fs_fid_clone(old_dentry->d_parent);
951
if (IS_ERR(olddirfid)) {
952
retval = PTR_ERR(olddirfid);
956
newdirfid = v9fs_fid_clone(new_dentry->d_parent);
957
if (IS_ERR(newdirfid)) {
958
retval = PTR_ERR(newdirfid);
962
down_write(&v9ses->rename_sem);
963
if (v9fs_proto_dotl(v9ses)) {
964
retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
965
newdirfid, new_dentry->d_name.name);
966
if (retval == -EOPNOTSUPP)
967
retval = p9_client_rename(oldfid, newdirfid,
968
new_dentry->d_name.name);
969
if (retval != -EOPNOTSUPP)
972
if (old_dentry->d_parent != new_dentry->d_parent) {
974
* 9P .u can only handle file rename in the same directory
977
P9_DPRINTK(P9_DEBUG_ERROR,
978
"old dir and new dir are different\n");
982
v9fs_blank_wstat(&wstat);
983
wstat.muid = v9ses->uname;
984
wstat.name = (char *) new_dentry->d_name.name;
985
retval = p9_client_wstat(oldfid, &wstat);
990
if (S_ISDIR(new_inode->i_mode))
991
clear_nlink(new_inode);
993
drop_nlink(new_inode);
995
if (S_ISDIR(old_inode->i_mode)) {
1000
v9fs_invalidate_inode_attr(old_inode);
1001
v9fs_invalidate_inode_attr(old_dir);
1002
v9fs_invalidate_inode_attr(new_dir);
1004
/* successful rename */
1005
d_move(old_dentry, new_dentry);
1007
up_write(&v9ses->rename_sem);
1008
p9_client_clunk(newdirfid);
1011
p9_client_clunk(olddirfid);
1018
* v9fs_vfs_getattr - retrieve file metadata
1019
* @mnt: mount information
1020
* @dentry: file to get attributes on
1021
* @stat: metadata structure to populate
1026
v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1030
struct v9fs_session_info *v9ses;
1032
struct p9_wstat *st;
1034
P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1036
v9ses = v9fs_dentry2v9ses(dentry);
1037
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1038
generic_fillattr(dentry->d_inode, stat);
1041
fid = v9fs_fid_lookup(dentry);
1043
return PTR_ERR(fid);
1045
st = p9_client_stat(fid);
1049
v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1050
generic_fillattr(dentry->d_inode, stat);
1058
* v9fs_vfs_setattr - set file metadata
1059
* @dentry: file whose metadata to set
1060
* @iattr: metadata assignment structure
1064
static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1067
struct v9fs_session_info *v9ses;
1069
struct p9_wstat wstat;
1071
P9_DPRINTK(P9_DEBUG_VFS, "\n");
1072
retval = inode_change_ok(dentry->d_inode, iattr);
1077
v9ses = v9fs_dentry2v9ses(dentry);
1078
fid = v9fs_fid_lookup(dentry);
1080
return PTR_ERR(fid);
1082
v9fs_blank_wstat(&wstat);
1083
if (iattr->ia_valid & ATTR_MODE)
1084
wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1086
if (iattr->ia_valid & ATTR_MTIME)
1087
wstat.mtime = iattr->ia_mtime.tv_sec;
1089
if (iattr->ia_valid & ATTR_ATIME)
1090
wstat.atime = iattr->ia_atime.tv_sec;
1092
if (iattr->ia_valid & ATTR_SIZE)
1093
wstat.length = iattr->ia_size;
1095
if (v9fs_proto_dotu(v9ses)) {
1096
if (iattr->ia_valid & ATTR_UID)
1097
wstat.n_uid = iattr->ia_uid;
1099
if (iattr->ia_valid & ATTR_GID)
1100
wstat.n_gid = iattr->ia_gid;
1103
/* Write all dirty data */
1104
if (S_ISREG(dentry->d_inode->i_mode))
1105
filemap_write_and_wait(dentry->d_inode->i_mapping);
1107
retval = p9_client_wstat(fid, &wstat);
1111
if ((iattr->ia_valid & ATTR_SIZE) &&
1112
iattr->ia_size != i_size_read(dentry->d_inode))
1113
truncate_setsize(dentry->d_inode, iattr->ia_size);
1115
v9fs_invalidate_inode_attr(dentry->d_inode);
1117
setattr_copy(dentry->d_inode, iattr);
1118
mark_inode_dirty(dentry->d_inode);
1123
* v9fs_stat2inode - populate an inode structure with mistat info
1124
* @stat: Plan 9 metadata (mistat) structure
1125
* @inode: inode to populate
1126
* @sb: superblock of filesystem
1131
v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1132
struct super_block *sb)
1137
unsigned int i_nlink;
1138
struct v9fs_session_info *v9ses = sb->s_fs_info;
1139
struct v9fs_inode *v9inode = V9FS_I(inode);
1141
set_nlink(inode, 1);
1143
inode->i_atime.tv_sec = stat->atime;
1144
inode->i_mtime.tv_sec = stat->mtime;
1145
inode->i_ctime.tv_sec = stat->mtime;
1147
inode->i_uid = v9ses->dfltuid;
1148
inode->i_gid = v9ses->dfltgid;
1150
if (v9fs_proto_dotu(v9ses)) {
1151
inode->i_uid = stat->n_uid;
1152
inode->i_gid = stat->n_gid;
1154
if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1155
if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1157
* Hadlink support got added later to
1158
* to the .u extension. So there can be
1159
* server out there that doesn't support
1160
* this even with .u extension. So check
1161
* for non NULL stat->extension
1163
strncpy(ext, stat->extension, sizeof(ext));
1164
/* HARDLINKCOUNT %u */
1165
sscanf(ext, "%13s %u", tag_name, &i_nlink);
1166
if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1167
set_nlink(inode, i_nlink);
1170
mode = stat->mode & S_IALLUGO;
1171
mode |= inode->i_mode & ~S_IALLUGO;
1172
inode->i_mode = mode;
1173
i_size_write(inode, stat->length);
1175
/* not real number of blocks, but 512 byte ones ... */
1176
inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1177
v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1181
* v9fs_qid2ino - convert qid into inode number
1184
* BUG: potential for inode number collisions?
1187
ino_t v9fs_qid2ino(struct p9_qid *qid)
1189
u64 path = qid->path + 2;
1192
if (sizeof(ino_t) == sizeof(path))
1193
memcpy(&i, &path, sizeof(ino_t));
1195
i = (ino_t) (path ^ (path >> 32));
1201
* v9fs_readlink - read a symlink's location (internal version)
1202
* @dentry: dentry for symlink
1203
* @buffer: buffer to load symlink location into
1204
* @buflen: length of buffer
1208
static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1212
struct v9fs_session_info *v9ses;
1214
struct p9_wstat *st;
1216
P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1218
v9ses = v9fs_dentry2v9ses(dentry);
1219
fid = v9fs_fid_lookup(dentry);
1221
return PTR_ERR(fid);
1223
if (!v9fs_proto_dotu(v9ses))
1226
st = p9_client_stat(fid);
1230
if (!(st->mode & P9_DMSYMLINK)) {
1235
/* copy extension buffer into buffer */
1236
strncpy(buffer, st->extension, buflen);
1238
P9_DPRINTK(P9_DEBUG_VFS,
1239
"%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1241
retval = strnlen(buffer, buflen);
1249
* v9fs_vfs_follow_link - follow a symlink path
1250
* @dentry: dentry for symlink
1255
static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1258
char *link = __getname();
1260
P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1263
link = ERR_PTR(-ENOMEM);
1265
len = v9fs_readlink(dentry, link, PATH_MAX);
1269
link = ERR_PTR(len);
1271
link[min(len, PATH_MAX-1)] = 0;
1273
nd_set_link(nd, link);
1279
* v9fs_vfs_put_link - release a symlink path
1280
* @dentry: dentry for symlink
1287
v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1289
char *s = nd_get_link(nd);
1291
P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1292
IS_ERR(s) ? "<error>" : s);
1298
* v9fs_vfs_mkspecial - create a special file
1299
* @dir: inode to create special file in
1300
* @dentry: dentry to create
1301
* @mode: mode to create special file
1302
* @extension: 9p2000.u format extension string representing special file
1306
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1307
int mode, const char *extension)
1311
struct v9fs_session_info *v9ses;
1313
v9ses = v9fs_inode2v9ses(dir);
1314
if (!v9fs_proto_dotu(v9ses)) {
1315
P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1319
perm = unixmode2p9mode(v9ses, mode);
1320
fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1323
return PTR_ERR(fid);
1325
v9fs_invalidate_inode_attr(dir);
1326
p9_client_clunk(fid);
1331
* v9fs_vfs_symlink - helper function to create symlinks
1332
* @dir: directory inode containing symlink
1333
* @dentry: dentry for symlink
1334
* @symname: symlink data
1336
* See Also: 9P2000.u RFC for more information
1341
v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1343
P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1344
dentry->d_name.name, symname);
1346
return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1350
* v9fs_vfs_link - create a hardlink
1351
* @old_dentry: dentry for file to link to
1352
* @dir: inode destination for new link
1353
* @dentry: dentry for link
1358
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1359
struct dentry *dentry)
1363
struct p9_fid *oldfid;
1365
P9_DPRINTK(P9_DEBUG_VFS,
1366
" %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1367
old_dentry->d_name.name);
1369
oldfid = v9fs_fid_clone(old_dentry);
1371
return PTR_ERR(oldfid);
1374
if (unlikely(!name)) {
1379
sprintf(name, "%d\n", oldfid->fid);
1380
retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1383
v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1384
v9fs_invalidate_inode_attr(dir);
1387
p9_client_clunk(oldfid);
1392
* v9fs_vfs_mknod - create a special file
1393
* @dir: inode destination for new link
1394
* @dentry: dentry for file
1395
* @mode: mode for creation
1396
* @rdev: device associated with special file
1401
v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1406
P9_DPRINTK(P9_DEBUG_VFS,
1407
" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1408
dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1410
if (!new_valid_dev(rdev))
1416
/* build extension */
1418
sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1419
else if (S_ISCHR(mode))
1420
sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1421
else if (S_ISFIFO(mode))
1423
else if (S_ISSOCK(mode))
1430
retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1436
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1441
struct p9_wstat *st;
1442
struct v9fs_session_info *v9ses;
1444
v9ses = v9fs_inode2v9ses(inode);
1445
st = p9_client_stat(fid);
1449
* Don't update inode if the file type is different
1451
umode = p9mode2unixmode(v9ses, st, &rdev);
1452
if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1455
spin_lock(&inode->i_lock);
1457
* We don't want to refresh inode->i_size,
1458
* because we may have cached data
1460
i_size = inode->i_size;
1461
v9fs_stat2inode(st, inode, inode->i_sb);
1463
inode->i_size = i_size;
1464
spin_unlock(&inode->i_lock);
1471
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1472
.create = v9fs_vfs_create,
1473
.lookup = v9fs_vfs_lookup,
1474
.symlink = v9fs_vfs_symlink,
1475
.link = v9fs_vfs_link,
1476
.unlink = v9fs_vfs_unlink,
1477
.mkdir = v9fs_vfs_mkdir,
1478
.rmdir = v9fs_vfs_rmdir,
1479
.mknod = v9fs_vfs_mknod,
1480
.rename = v9fs_vfs_rename,
1481
.getattr = v9fs_vfs_getattr,
1482
.setattr = v9fs_vfs_setattr,
1485
static const struct inode_operations v9fs_dir_inode_operations = {
1486
.create = v9fs_vfs_create,
1487
.lookup = v9fs_vfs_lookup,
1488
.unlink = v9fs_vfs_unlink,
1489
.mkdir = v9fs_vfs_mkdir,
1490
.rmdir = v9fs_vfs_rmdir,
1491
.mknod = v9fs_vfs_mknod,
1492
.rename = v9fs_vfs_rename,
1493
.getattr = v9fs_vfs_getattr,
1494
.setattr = v9fs_vfs_setattr,
1497
static const struct inode_operations v9fs_file_inode_operations = {
1498
.getattr = v9fs_vfs_getattr,
1499
.setattr = v9fs_vfs_setattr,
1502
static const struct inode_operations v9fs_symlink_inode_operations = {
1503
.readlink = generic_readlink,
1504
.follow_link = v9fs_vfs_follow_link,
1505
.put_link = v9fs_vfs_put_link,
1506
.getattr = v9fs_vfs_getattr,
1507
.setattr = v9fs_vfs_setattr,