[PATCH 3/7] v9fs: VFS inode operations (2.0)

ericvh
2005-06-07T15:22:37Z

This is part [3/7] of the v9fs-2.0 patch against Linux 2.6.

This part of the patch contains the VFS inode interfaces.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

----------

vfs_inode.c | 1418 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
vfs_super.c | 0
2 files changed, 1418 insertions(+)

----------

--- /dev/null
+++ b/fs/9p/vfs_inode.c
@@ -0,0 +1,1418 @@
+/*
+ * linux/fs/9p/vfs_inode.c
+ *
+ * This file contians vfs inode ops for the 9P2000 protocol.
+ *
+ * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/pagemap.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/namei.h>
+
+#include "debug.h"
+#include "idpool.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "conv.h"
+#include "fid.h"
+
+static struct inode_operations v9fs_dir_inode_operations;
+static struct inode_operations v9fs_file_inode_operations;
+static struct inode_operations v9fs_symlink_inode_operations;
+
+/**
+ * unixmode2p9mode - convert unix mode bits to plan 9
+ * @v9ses: v9fs session information
+ * @mode: mode to convert
+ *
+ */
+
+static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
+{
+ int res;
+ res = mode & 0777;
+ if (S_ISDIR(mode))
+ res |= V9FS_DMDIR;
+ if (v9ses->extended) {
+ if (S_ISLNK(mode))
+ res |= V9FS_DMSYMLINK;
+ if (v9ses->nodev == 0) {
+ if (S_ISSOCK(mode))
+ res |= V9FS_DMSOCKET;
+ if (S_ISFIFO(mode))
+ res |= V9FS_DMNAMEDPIPE;
+ if (S_ISBLK(mode))
+ res |= V9FS_DMDEVICE;
+ if (S_ISCHR(mode))
+ res |= V9FS_DMDEVICE;
+ }
+
+ if ((mode & S_ISUID) == S_ISUID)
+ res |= V9FS_DMSETUID;
+ if ((mode & S_ISGID) == S_ISGID)
+ res |= V9FS_DMSETGID;
+ if ((mode & V9FS_DMLINK))
+ res |= V9FS_DMLINK;
+ }
+
+ return res;
+}
+
+/**
+ * p9mode2unixmode- convert plan9 mode bits to unix mode bits
+ * @v9ses: v9fs session information
+ * @mode: mode to convert
+ *
+ */
+
+static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
+{
+ int res;
+
+ res = mode & 0777;
+
+ if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
+ res |= S_IFDIR;
+ else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
+ res |= S_IFLNK;
+ else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
+ && (v9ses->nodev == 0))
+ res |= S_IFSOCK;
+ else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
+ && (v9ses->nodev == 0))
+ res |= S_IFIFO;
+ else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
+ && (v9ses->nodev == 0))
+ res |= S_IFBLK;
+ else
+ res |= S_IFREG;
+
+ if (v9ses->extended) {
+ if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
+ res |= S_ISUID;
+
+ if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
+ res |= S_ISGID;
+ }
+
+ return res;
+}
+
+/**
+ * v9fs_blank_mistat - helper function to setup a 9P stat structure
+ * @v9ses: 9P session info (for determining extended mode)
+ * @mistat: structure to initialize
+ *
+ */
+
+static inline void
+v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
+{
+ mistat->type = ~0;
+ mistat->dev = ~0;
+ mistat->qid.type = ~0;
+ mistat->qid.version = ~0;
+ *((long long *)&mistat->qid.path) = ~0;
+ mistat->mode = ~0;
+ mistat->atime = ~0;
+ mistat->mtime = ~0;
+ mistat->length = ~0;
+ mistat->name = mistat->data;
+ mistat->uid = mistat->data;
+ mistat->gid = mistat->data;
+ mistat->muid = mistat->data;
+ if (v9ses->extended) {
+ mistat->n_uid = ~0;
+ mistat->n_gid = ~0;
+ mistat->n_muid = ~0;
+ mistat->extension = mistat->data;
+ }
+ *mistat->data = 0;
+}
+
+/**
+ * v9fs_mistat2unix - convert mistat to unix stat
+ * @mistat: Plan 9 metadata (mistat) structure
+ * @stat: unix metadata (stat) structure to populate
+ * @sb: superblock
+ *
+ */
+
+static void
+v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
+ struct super_block *sb)
+{
+ struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
+
+ buf->st_nlink = 1;
+
+ buf->st_atime = mistat->atime;
+ buf->st_mtime = mistat->mtime;
+ buf->st_ctime = mistat->mtime;
+
+ if (v9ses && v9ses->extended) {
+ /* TODO: string to uid mapping via user-space daemon */
+ buf->st_uid = mistat->n_uid;
+ buf->st_gid = mistat->n_gid;
+
+ sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
+ sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
+ } else {
+ buf->st_uid = v9ses->uid;
+ buf->st_gid = v9ses->gid;
+ }
+
+ buf->st_uid = (unsigned short)-1;
+ buf->st_gid = (unsigned short)-1;
+
+ if (v9ses && v9ses->extended) {
+ if (mistat->n_uid != -1)
+ sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
+
+ if (mistat->n_gid != -1)
+ sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
+ }
+
+ if (buf->st_uid == (unsigned short)-1)
+ buf->st_uid = v9ses->uid;
+ if (buf->st_gid == (unsigned short)-1)
+ buf->st_gid = v9ses->gid;
+
+ buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
+ if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
+ char type = 0;
+ int major = -1;
+ int minor = -1;
+ sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
+ switch (type) {
+ case 'c':
+ buf->st_mode &= ~S_IFBLK;
+ buf->st_mode |= S_IFCHR;
+ break;
+ case 'b':
+ break;
+ default:
+ dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
+ type, mistat->extension);
+ };
+ buf->st_rdev = MKDEV(major, minor);
+ } else
+ buf->st_rdev = 0;
+
+ buf->st_size = mistat->length;
+
+ buf->st_blksize = sb->s_blocksize;
+ buf->st_blocks =
+ (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
+}
+
+/**
+ * v9fs_get_inode - helper function to setup an inode
+ * @sb: superblock
+ * @mode: mode to setup inode with
+ *
+ */
+
+struct inode *v9fs_get_inode(struct super_block *sb, int mode)
+{
+ struct inode *inode = NULL;
+
+ dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
+
+ inode = new_inode(sb);
+ if (inode) {
+ inode->i_mode = mode;
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_blksize = sb->s_blocksize;
+ inode->i_blocks = 0;
+ inode->i_rdev = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFSOCK:
+ case S_IFREG:
+ inode->i_op = &v9fs_file_inode_operations;
+ inode->i_fop = &v9fs_file_operations;
+ break;
+ case S_IFDIR:
+ inode->i_nlink++;
+ inode->i_op = &v9fs_dir_inode_operations;
+ inode->i_fop = &v9fs_dir_operations;
+ break;
+ case S_IFLNK:
+ inode->i_op = &v9fs_symlink_inode_operations;
+ break;
+ default:
+ dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
+ mode, mode & S_IFMT);
+ sb->s_op->put_inode(inode);
+ return ERR_PTR(-EINVAL);
+ }
+ } else {
+ eprintk(KERN_WARNING, "Problem allocating inode\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ return inode;
+}
+
+/**
+ * v9fs_create - helper function to create files and directories
+ * @dir: directory inode file is being created in
+ * @file_dentry: dentry file is being created in
+ * @perm: permissions file is being created with
+ * @open_mode: resulting open mode for file ???
+ *
+ */
+
+static int
+v9fs_create(struct inode *dir,
+ struct dentry *file_dentry,
+ unsigned int perm, unsigned int open_mode)
+{
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+ struct super_block *sb = dir->i_sb;
+ struct v9fs_fid *dirfid =
+ v9fs_fid_lookup(file_dentry->d_parent, FID_WALK);
+ struct v9fs_fid *fid = NULL;
+ struct inode *file_inode = NULL;
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_qid qid;
+ struct stat newstat;
+ int dirfidnum = -1;
+ long newfid = -1;
+ int result = 0;
+ unsigned int iounit = 0;
+
+ perm = unixmode2p9mode(v9ses, perm);
+
+ dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
+ file_dentry, perm, open_mode);
+
+ if (!dirfid)
+ return -EBADF;
+
+ dirfidnum = dirfid->fid;
+ if (dirfidnum < 0) {
+ dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
+ dir->i_ino);
+ return -EBADF;
+ }
+
+ if (file_dentry->d_inode) {
+ dprintk(DEBUG_ERROR,
+ "Odd. There is an inode for dir %lu, name :%s:\n",
+ dir->i_ino, file_dentry->d_name.name);
+ return -EEXIST;
+ }
+
+ newfid = v9fs_get_idpool(&v9ses->fidpool);
+ if (newfid < 0) {
+ eprintk(KERN_WARNING, "no free fids available\n");
+ return -ENOSPC;
+ }
+
+ result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
+ if (result < 0) {
+ dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
+ v9fs_put_idpool(newfid, &v9ses->fidpool);
+ newfid = 0;
+ goto CleanUpFid;
+ }
+
+ kfree(fcall);
+
+ result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
+ perm, open_mode, &fcall);
+ if (result < 0) {
+ dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
+ FCALL_ERROR(fcall), result);
+
+ goto CleanUpFid;
+ }
+
+ iounit = fcall->params.rcreate.iounit;
+ qid = fcall->params.rcreate.qid;
+ kfree(fcall);
+
+ fid = v9fs_fid_create(file_dentry);
+ if (!fid) {
+ result = -ENOMEM;
+ goto CleanUpFid;
+ }
+
+ fid->fid = newfid;
+ fid->fidopen = 0;
+ fid->fidcreate = 1;
+ fid->qid = qid;
+ fid->iounit = iounit;
+ fid->rdir_pos = 0;
+ fid->rdir_fcall = NULL;
+ fid->v9ses = v9ses;
+
+ if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
+ (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
+ (perm & V9FS_DMDEVICE))
+ return 0;
+
+ result = v9fs_t_stat(v9ses, newfid, &fcall);
+ if (result < 0) {
+ dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
+ result);
+ goto CleanUpFid;
+ }
+
+ v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
+
+ file_inode = v9fs_get_inode(sb, newstat.st_mode);
+ if ((!file_inode) || IS_ERR(file_inode)) {
+ dprintk(DEBUG_ERROR, "create inode failed\n");
+ result = -EBADF;
+ goto CleanUpFid;
+ }
+
+ v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
+ kfree(fcall);
+ d_instantiate(file_dentry, file_inode);
+
+ if (perm & V9FS_DMDIR) {
+ if (v9fs_t_clunk(v9ses, newfid, &fcall))
+ dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
+ FCALL_ERROR(fcall));
+
+ v9fs_put_idpool(newfid, &v9ses->fidpool);
+ kfree(fcall);
+ fid->fidopen = 0;
+ fid->fidcreate = 0;
+ d_drop(file_dentry);
+ }
+
+ return 0;
+
+ CleanUpFid:
+ kfree(fcall);
+
+ if (newfid) {
+ if (v9fs_t_clunk(v9ses, newfid, &fcall))
+ dprintk(DEBUG_ERROR, "clunk failed: %s\n",
+ FCALL_ERROR(fcall));
+
+ v9fs_put_idpool(newfid, &v9ses->fidpool);
+ kfree(fcall);
+ }
+ return result;
+}
+
+/**
+ * v9fs_remove - helper function to remove files and directories
+ * @inode: directory inode that is being deleted
+ * @dentry: dentry that is being deleted
+ * @rmdir: where we are a file or a directory
+ *
+ */
+
+static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
+{
+ struct v9fs_fcall *fcall = NULL;
+ struct super_block *sb = NULL;
+ struct v9fs_session_info *v9ses = NULL;
+ struct v9fs_fid *v9fid = NULL;
+ struct inode *file_inode = NULL;
+ int fid = -1;
+ int result = 0;
+
+ dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
+ rmdir);
+
+ if (!dir || !S_ISDIR(dir->i_mode)) {
+ dprintk(DEBUG_ERROR, "dir inode is NULL or not a directory\n");
+ return -ENOENT;
+ }
+
+ if (!file) {
+ dprintk(DEBUG_ERROR, "NO dentry for file to remove\n");
+ return -EBADF;
+ }
+
+ if (!file->d_inode) {
+ dprintk(DEBUG_ERROR,
+ "dentry %p NO INODE for file to remove!\n", file);
+ return -EBADF;
+ }
+
+ file_inode = file->d_inode;
+ sb = file_inode->i_sb;
+ v9ses = v9fs_inode2v9ses(file_inode);
+ v9fid = v9fs_fid_lookup(file, FID_OP);
+
+ if (!sb || !v9ses || !v9fid) {
+ dprintk(DEBUG_ERROR,
+ "no superblock or v9session or v9fs_fid\n");
+ return -EBADF;
+ }
+
+ fid = v9fid->fid;
+ if (fid < 0) {
+ dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
+ file_inode->i_ino);
+ return -EBADF;
+ }
+
+ if (rmdir && (!S_ISDIR(file_inode->i_mode))) {
+ dprintk(DEBUG_ERROR, "trying to remove non-directory\n");
+ return -ENOTDIR;
+ } else if ((!rmdir) && S_ISDIR(file_inode->i_mode)) {
+ dprintk(DEBUG_ERROR, "trying to remove directory\n");
+ return -EISDIR;
+ }
+
+ result = v9fs_t_remove(v9ses, fid, &fcall);
+ if (result < 0)
+ dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
+ FCALL_ERROR(fcall), result);
+ else {
+ v9fs_put_idpool(fid, &v9ses->fidpool);
+ v9fs_fid_destroy(v9fid);
+ }
+
+ kfree(fcall);
+
+ return result;
+}
+
+/**
+ * v9fs_vfs_create - VFS hook to create files
+ * @inode: directory inode that is being deleted
+ * @dentry: dentry that is being deleted
+ * @perm: create permissions
+ * @nd: path information
+ *
+ */
+
+static int
+v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
+ struct nameidata *nd)
+{
+ return v9fs_create(inode, dentry, perm, O_RDWR);
+}
+
+/**
+ * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
+ * @i: inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ * @mode: mode for new directory
+ *
+ */
+
+static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
+{
+ return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
+}
+
+/**
+ * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
+ * @dir: inode that is being walked from
+ * @dentry: dentry that is being walked to?
+ * @nameidata: path data
+ *
+ */
+
+static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nameidata)
+{
+ struct super_block *sb;
+ struct v9fs_session_info *v9ses;
+ struct v9fs_fid *dirfid;
+ struct v9fs_fid *fid;
+ struct inode *inode;
+ struct v9fs_fcall *fcall = NULL;
+ struct stat newstat;
+ int dirfidnum = -1;
+ int newfid = -1;
+ int result = 0;
+
+ dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
+ dir, dentry->d_iname, dentry, nameidata);
+
+ if (!dir) {
+ dprintk(DEBUG_ERROR, "no dir inode\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ sb = dir->i_sb;
+ v9ses = v9fs_inode2v9ses(dir);
+ dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
+
+ if (!sb || !v9ses || !dirfid) {
+ dprintk(DEBUG_ERROR, "no superblock, v9ses, or dirfid\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ dirfidnum = dirfid->fid;
+
+ if (dirfidnum < 0) {
+ dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
+ dir, dir->i_ino);
+ return ERR_PTR(-EBADF);
+ }
+
+ newfid = v9fs_get_idpool(&v9ses->fidpool);
+ if (newfid < 0) {
+ eprintk(KERN_WARNING, "newfid fails!\n");
+ return ERR_PTR(-ENOSPC);
+ }
+
+ result =
+ v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
+ NULL);
+ if (result < 0) {
+ v9fs_put_idpool(newfid, &v9ses->fidpool);
+ if (result == -ENOENT) {
+ d_add(dentry, NULL);
+ dprintk(DEBUG_ERROR,
+ "Return negative dentry %p count %d\n",
+ dentry, atomic_read(&dentry->d_count));
+ return NULL;
+ }
+ dprintk(DEBUG_ERROR, "walk error:%d\n", result);
+ goto FreeFcall;
+ }
+
+ result = v9fs_t_stat(v9ses, newfid, &fcall);
+ if (result < 0) {
+ dprintk(DEBUG_ERROR, "stat error\n");
+ goto FreeFcall;
+ }
+
+ v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
+ inode = v9fs_get_inode(sb, newstat.st_mode);
+
+ if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
+ eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
+ PTR_ERR(inode));
+
+ result = -ENOSPC;
+ goto FreeFcall;
+ }
+
+ inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
+
+ fid = v9fs_fid_create(dentry);
+ if (fid == NULL) {
+ dprintk(DEBUG_ERROR, "couldn't insert\n");
+ result = -ENOMEM;
+ goto FreeFcall;
+ }
+
+ fid->fid = newfid;
+ fid->fidopen = 0;
+ fid->v9ses = v9ses;
+ fid->qid = fcall->params.rstat.stat->qid;
+
+ dentry->d_op = &v9fs_dentry_operations;
+ v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
+
+ d_add(dentry, inode);
+ kfree(fcall);
+
+ return NULL;
+
+ FreeFcall:
+ kfree(fcall);
+ return ERR_PTR(result);
+}
+
+/**
+ * v9fs_vfs_unlink - VFS unlink hook to delete an inode
+ * @i: inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ *
+ */
+
+static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
+{
+ return v9fs_remove(i, d, 0);
+}
+
+/**
+ * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
+ * @i: inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ *
+ */
+
+static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
+{
+ return v9fs_remove(i, d, 1);
+}
+
+/**
+ * v9fs_vfs_rename - VFS hook to rename an inode
+ * @old_dir: old dir inode
+ * @old_dentry: old dentry
+ * @new_dir: new dir inode
+ * @new_dentry: new dentry
+ *
+ */
+
+static int
+v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ struct inode *old_inode = old_dentry->d_inode;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
+ struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK);
+ struct v9fs_fid *olddirfid =
+ v9fs_fid_lookup(old_dentry->d_parent, FID_WALK);
+ struct v9fs_fid *newdirfid =
+ v9fs_fid_lookup(new_dentry->d_parent, FID_WALK);
+ struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ struct v9fs_fcall *fcall = NULL;
+ int fid = -1;
+ int olddirfidnum = -1;
+ int newdirfidnum = -1;
+ int retval = 0;
+
+ dprintk(DEBUG_VFS, "\n");
+
+ if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
+ dprintk(DEBUG_ERROR, "problem with arguments\n");
+ return -EBADF;
+ }
+
+ /* 9P can only handle file rename in the same directory */
+ if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
+ dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
+ retval = -EPERM;
+ goto FreeFcallnBail;
+ }
+
+ fid = oldfid->fid;
+ olddirfidnum = olddirfid->fid;
+ newdirfidnum = newdirfid->fid;
+
+ if (fid < 0) {
+ dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
+ old_inode->i_ino);
+ retval = -EBADF;
+ goto FreeFcallnBail;
+ }
+
+ v9fs_blank_mistat(v9ses, mistat);
+
+ strcpy(mistat->data + 1, v9ses->name);
+ mistat->name = mistat->data + 1 + strlen(v9ses->name);
+
+ if (new_dentry->d_name.len >
+ (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
+ dprintk(DEBUG_ERROR, "new name too long\n");
+ goto FreeFcallnBail;
+ }
+
+ strcpy(mistat->name, new_dentry->d_name.name);
+ retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
+
+ FreeFcallnBail:
+ kfree(mistat);
+
+ if (retval < 0)
+ dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+ FCALL_ERROR(fcall));
+
+ kfree(fcall);
+ return retval;
+}
+
+/**
+ * v9fs_vfs_getattr - retreive file metadata
+ * @mnt - mount information
+ * @dentry - file to get attributes on
+ * @stat - metadata structure to populate
+ *
+ */
+
+static int
+v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+ int err = -EPERM;
+
+ dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
+ if (!fid) {
+ dprintk(DEBUG_ERROR,
+ "couldn't find fid associated with dentry\n");
+ return -EBADF;
+ }
+
+ err = v9fs_t_stat(v9ses, fid->fid, &fcall);
+
+ if (err < 0)
+ dprintk(DEBUG_ERROR, "stat error\n");
+ else {
+ v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
+ dentry->d_inode->i_sb);
+ generic_fillattr(dentry->d_inode, stat);
+ }
+
+ kfree(fcall);
+ return err;
+}
+
+/**
+ * v9fs_vfs_setattr - set file metadata
+ * @dentry: file whose metadata to set
+ * @iattr: metadata assignment structure
+ *
+ */
+
+static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+ struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ struct v9fs_fcall *fcall = NULL;
+ int res = -EPERM;
+
+ dprintk(DEBUG_VFS, "\n");
+ if (!fid) {
+ dprintk(DEBUG_ERROR,
+ "Couldn't find fid associated with dentry\n");
+ return -EBADF;
+ }
+
+ if (!mistat)
+ return -ENOMEM;
+
+ v9fs_blank_mistat(v9ses, mistat);
+ if (iattr->ia_valid & ATTR_MODE)
+ mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
+
+ if (iattr->ia_valid & ATTR_MTIME)
+ mistat->mtime = iattr->ia_mtime.tv_sec;
+
+ if (iattr->ia_valid & ATTR_ATIME)
+ mistat->atime = iattr->ia_atime.tv_sec;
+
+ if (iattr->ia_valid & ATTR_SIZE)
+ mistat->length = iattr->ia_size;
+
+ if (v9ses->extended) {
+ char *uid = kmalloc(strlen(mistat->uid), GFP_KERNEL);
+ char *gid = kmalloc(strlen(mistat->gid), GFP_KERNEL);
+ char *muid = kmalloc(strlen(mistat->muid), GFP_KERNEL);
+ char *name = kmalloc(strlen(mistat->name), GFP_KERNEL);
+ char *extension = kmalloc(strlen(mistat->extension),
+ GFP_KERNEL);
+
+ if ((!uid) || (!gid) || (!muid) || (!name) || (!extension)) {
+ kfree(uid);
+ kfree(gid);
+ kfree(muid);
+ kfree(name);
+ kfree(extension);
+
+ return -ENOMEM;
+ }
+
+ strcpy(uid, mistat->uid);
+ strcpy(gid, mistat->gid);
+ strcpy(muid, mistat->muid);
+ strcpy(name, mistat->name);
+ strcpy(extension, mistat->extension);
+
+ if (iattr->ia_valid & ATTR_UID) {
+ if (strlen(uid) != 8) {
+ dprintk(DEBUG_ERROR, "uid strlen is %u not 8\n",
+ (unsigned int)strlen(uid));
+ sprintf(uid, "%08x", iattr->ia_uid);
+ } else {
+ kfree(uid);
+ uid = kmalloc(9, GFP_KERNEL);
+ }
+
+ sprintf(uid, "%08x", iattr->ia_uid);
+ mistat->n_uid = iattr->ia_uid;
+ }
+
+ if (iattr->ia_valid & ATTR_GID) {
+ if (strlen(gid) != 8)
+ dprintk(DEBUG_ERROR, "gid strlen is %u not 8\n",
+ (unsigned int)strlen(gid));
+ else {
+ kfree(gid);
+ gid = kmalloc(9, GFP_KERNEL);
+ }
+
+ sprintf(gid, "%08x", iattr->ia_gid);
+ mistat->n_gid = iattr->ia_gid;
+ }
+
+ mistat->uid = mistat->data;
+ strcpy(mistat->uid, uid);
+ mistat->gid = mistat->data + strlen(uid) + 1;
+ strcpy(mistat->gid, gid);
+ mistat->muid = mistat->gid + strlen(gid) + 1;
+ strcpy(mistat->muid, muid);
+ mistat->name = mistat->muid + strlen(muid) + 1;
+ strcpy(mistat->name, name);
+ mistat->extension = mistat->name + strlen(name) + 1;
+ strcpy(mistat->extension, extension);
+
+ kfree(uid);
+ kfree(gid);
+ kfree(muid);
+ kfree(name);
+ kfree(extension);
+ }
+
+ res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
+
+ if (res < 0)
+ dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
+
+ kfree(mistat);
+ kfree(fcall);
+
+ if (res >= 0)
+ res = inode_setattr(dentry->d_inode, iattr);
+
+ return res;
+}
+
+/**
+ * v9fs_mistat2inode - populate an inode structure with mistat info
+ * @mistat: Plan 9 metadata (mistat) structure
+ * @inode: inode to populate
+ * @sb: superblock of filesystem
+ *
+ */
+
+void
+v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
+ struct super_block *sb)
+{
+ struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
+
+ inode->i_nlink = 1;
+
+ inode->i_atime.tv_sec = mistat->atime;
+ inode->i_mtime.tv_sec = mistat->mtime;
+ inode->i_ctime.tv_sec = mistat->mtime;
+
+ inode->i_uid = -1;
+ inode->i_gid = -1;
+
+ if (v9ses && v9ses->extended) {
+ /* TODO: string to uid mapping via user-space daemon */
+ inode->i_uid = mistat->n_uid;
+ inode->i_gid = mistat->n_gid;
+
+ if (mistat->n_uid == -1)
+ sscanf(mistat->uid, "%x", &inode->i_uid);
+
+ if (mistat->n_gid == -1)
+ sscanf(mistat->gid, "%x", &inode->i_gid);
+ }
+
+ if (inode->i_uid == -1)
+ inode->i_uid = v9ses->uid;
+ if (inode->i_gid == -1)
+ inode->i_gid = v9ses->gid;
+
+ inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
+ if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
+ char type = 0;
+ int major = -1;
+ int minor = -1;
+ sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
+ switch (type) {
+ case 'c':
+ inode->i_mode &= ~S_IFBLK;
+ inode->i_mode |= S_IFCHR;
+ break;
+ case 'b':
+ break;
+ default:
+ dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
+ type, mistat->extension);
+ };
+ inode->i_rdev = MKDEV(major, minor);
+ } else
+ inode->i_rdev = 0;
+
+ inode->i_size = mistat->length;
+
+ inode->i_blksize = sb->s_blocksize;
+ inode->i_blocks =
+ (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
+}
+
+/**
+ * v9fs_qid2ino - convert qid into inode number
+ * @qid: qid to hash
+ *
+ * BUG: potential for inode number collisions?
+ */
+
+ino_t v9fs_qid2ino(struct v9fs_qid *qid)
+{
+ u64 path = qid->path + 2;
+ ino_t i = 0;
+
+ if (sizeof(ino_t) == sizeof(path))
+ memcpy(&i, &path, sizeof(ino_t));
+ else
+ i = (ino_t) (path ^ (path >> 32));
+
+ return i;
+}
+
+/**
+ * v9fs_vfs_symlink - helper function to create symlinks
+ * @dir: directory inode containing symlink
+ * @dentry: dentry for symlink
+ * @symname: symlink data
+ *
+ * See 9P2000.u RFC for more information
+ *
+ */
+
+static int
+v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+ int retval = -EPERM;
+ struct v9fs_fid *newfid;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+ struct super_block *sb = dir ? dir->i_sb : NULL;
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+
+ dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
+ symname);
+
+ if ((!dentry) || (!sb) || (!v9ses)) {
+ dprintk(DEBUG_ERROR, "problem with arguments\n");
+ return -EBADF;
+ }
+
+ if (!v9ses->extended) {
+ dprintk(DEBUG_ERROR, "not extended\n");
+ goto FreeFcall;
+ }
+
+ /* issue a create */
+ retval = v9fs_create(dir, dentry, S_IFLNK, 0);
+ if (retval != 0)
+ goto FreeFcall;
+
+ newfid = v9fs_fid_lookup(dentry, FID_OP);
+
+ /* issue a twstat */
+ v9fs_blank_mistat(v9ses, mistat);
+ strcpy(mistat->data + 1, symname);
+ mistat->extension = mistat->data + 1;
+ retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+ if (retval < 0) {
+ dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeFcall;
+ }
+
+ /* need to update dcache so we show up */
+ kfree(fcall);
+ fcall = NULL;
+
+ if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeFcall;
+ }
+
+ d_drop(dentry); /* FID - will this also clunk? */
+
+ FreeFcall:
+ kfree(mistat);
+ kfree(fcall);
+
+ return retval;
+}
+
+/**
+ * v9fs_readlink - read a symlink's location (internal version)
+ * @dentry: dentry for symlink
+ * @buf: buffer to load symlink location into
+ * @buflen: length of buffer
+ *
+ */
+
+static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
+{
+ int retval = -EPERM;
+
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+
+ if (!fid) {
+ dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
+ retval = -EBADF;
+ goto FreeFcall;
+ }
+
+ if (!v9ses->extended) {
+ retval = -EBADF;
+ dprintk(DEBUG_ERROR, "not extended\n");
+ goto FreeFcall;
+ }
+
+ dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
+ retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
+
+ if (retval < 0) {
+ dprintk(DEBUG_ERROR, "stat error\n");
+ goto FreeFcall;
+ }
+
+ if (!fcall)
+ return -EIO;
+
+ if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
+ retval = -EINVAL;
+ goto FreeFcall;
+ }
+
+ /* copy extension buffer into buffer */
+ if (strlen(fcall->params.rstat.stat->extension) < buflen)
+ buflen = strlen(fcall->params.rstat.stat->extension);
+
+ memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
+
+ retval = buflen;
+
+ FreeFcall:
+ kfree(fcall);
+
+ return retval;
+}
+
+/**
+ * v9fs_vfs_readlink - read a symlink's location
+ * @dentry: dentry for symlink
+ * @buf: buffer to load symlink location into
+ * @buflen: length of buffer
+ *
+ */
+
+static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
+ int buflen)
+{
+ int retval;
+ int ret;
+ char *link = __getname();
+
+ if (strlen(link) < buflen)
+ buflen = strlen(link);
+
+ dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+ retval = v9fs_readlink(dentry, link, buflen);
+
+ if (retval > 0) {
+ if ((ret = copy_to_user(buffer, link, retval)) != 0) {
+ dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
+ ret);
+ retval = ret;
+ }
+ }
+
+ putname(link);
+ return retval;
+}
+
+/**
+ * v9fs_vfs_follow_link - follow a symlink path
+ * @dentry: dentry for symlink
+ * @nd: nameidata
+ *
+ */
+
+static int v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ int len = 0;
+ char *link = __getname();
+
+ dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
+
+ if (!link)
+ link = ERR_PTR(-ENOMEM);
+ else {
+ len = v9fs_readlink(dentry, link, strlen(link));
+
+ if (len < 0) {
+ putname(link);
+ link = ERR_PTR(len);
+ } else
+ link[len] = 0;
+ }
+ nd_set_link(nd, link);
+
+ return 0;
+}
+
+/**
+ * v9fs_vfs_put_link - release a symlink path
+ * @dentry: dentry for symlink
+ * @nd: nameidata
+ *
+ */
+
+static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd)
+{
+ char *s = nd_get_link(nd);
+
+ dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
+ if (!IS_ERR(s))
+ putname(s);
+}
+
+/**
+ * v9fs_vfs_link - create a hardlink
+ * @old_dentry: dentry for file to link to
+ * @dir: inode destination for new link
+ * @new_dentry: dentry for link
+ *
+ */
+
+/* XXX - lots of code dup'd from symlink and creates,
+ * figure out a better reuse strategy
+ */
+
+static int
+v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ int retval = -EPERM;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+ struct super_block *sb = dir ? dir->i_sb : NULL;
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP);
+ struct v9fs_fid *newfid = NULL;
+ char *symname = __getname();
+
+ dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
+ old_dentry->d_name.name);
+
+ if ((!dentry) || (!sb) || (!v9ses) || (!oldfid)) {
+ dprintk(DEBUG_ERROR, "problem with arguments\n");
+ retval = -EBADF;
+ goto FreeMem;
+ }
+
+ if (!v9ses->extended) {
+ dprintk(DEBUG_ERROR, "not extended\n");
+ goto FreeMem;
+ }
+
+ /* get fid of old_dentry */
+ sprintf(symname, "hardlink(%d)\n", oldfid->fid);
+
+ /* issue a create */
+ retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
+ if (retval != 0)
+ goto FreeMem;
+
+ newfid = v9fs_fid_lookup(dentry, FID_OP);
+ if (!newfid) {
+ dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
+ goto FreeMem;
+ }
+
+ /* issue a twstat */
+ v9fs_blank_mistat(v9ses, mistat);
+ strcpy(mistat->data + 1, symname);
+ mistat->extension = mistat->data + 1;
+ retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+ if (retval < 0) {
+ dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeMem;
+ }
+
+ /* need to update dcache so we show up */
+ kfree(fcall);
+ fcall = NULL;
+
+ if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeMem;
+ }
+
+ d_drop(dentry); /* FID - will this also clunk? */
+
+ kfree(fcall);
+ fcall = NULL;
+
+ FreeMem:
+ kfree(mistat);
+ kfree(fcall);
+ putname(symname);
+ return retval;
+}
+
+/**
+ * v9fs_vfs_mknod - create a special file
+ * @dir: inode destination for new link
+ * @dentry: dentry for file
+ * @mode: mode for creation
+ * @dev_t: device associated with special file
+ *
+ */
+
+static int
+v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
+{
+ int retval = -EPERM;
+ struct v9fs_fid *newfid;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+ struct super_block *sb = dir ? dir->i_sb : NULL;
+ struct v9fs_fcall *fcall = NULL;
+ struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ char *symname = __getname();
+
+ dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
+ dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
+
+ if (!new_valid_dev(rdev)) {
+ retval = -EINVAL;
+ goto FreeMem;
+ }
+
+ if ((!dentry) || (!sb) || (!v9ses)) {
+ dprintk(DEBUG_ERROR, "problem with arguments\n");
+ retval = -EBADF;
+ goto FreeMem;
+ }
+
+ if (!v9ses->extended) {
+ dprintk(DEBUG_ERROR, "not extended\n");
+ goto FreeMem;
+ }
+
+ /* issue a create */
+ retval = v9fs_create(dir, dentry, mode, 0);
+
+ if (retval != 0)
+ goto FreeMem;
+
+ newfid = v9fs_fid_lookup(dentry, FID_OP);
+ if (!newfid) {
+ dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
+ retval = -EINVAL;
+ goto FreeMem;
+ }
+
+ /* build extension */
+ if (S_ISBLK(mode))
+ sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
+ else if (S_ISCHR(mode))
+ sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
+ else if (S_ISFIFO(mode)) ; /* DO NOTHING */
+ else {
+ retval = -EINVAL;
+ goto FreeMem;
+ }
+
+ if (!S_ISFIFO(mode)) {
+ /* issue a twstat */
+ v9fs_blank_mistat(v9ses, mistat);
+ strcpy(mistat->data + 1, symname);
+ mistat->extension = mistat->data + 1;
+ retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+ if (retval < 0) {
+ dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeMem;
+ }
+
+ kfree(fcall);
+ }
+
+ /* need to update dcache so we show up */
+ kfree(fcall);
+
+ if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+ FCALL_ERROR(fcall));
+ goto FreeMem;
+ }
+
+ d_drop(dentry); /* FID - will this also clunk? */
+
+ FreeMem:
+ kfree(mistat);
+ kfree(fcall);
+ putname(symname);
+
+ return retval;
+}
+
+static struct inode_operations v9fs_dir_inode_operations = {
+ .create = v9fs_vfs_create,
+ .lookup = v9fs_vfs_lookup,
+ .symlink = v9fs_vfs_symlink,
+ .link = v9fs_vfs_link,
+ .unlink = v9fs_vfs_unlink,
+ .mkdir = v9fs_vfs_mkdir,
+ .rmdir = v9fs_vfs_rmdir,
+ .mknod = v9fs_vfs_mknod,
+ .rename = v9fs_vfs_rename,
+ .readlink = v9fs_vfs_readlink,
+ .getattr = v9fs_vfs_getattr,
+ .setattr = v9fs_vfs_setattr,
+};
+
+static struct inode_operations v9fs_file_inode_operations = {
+ .getattr = v9fs_vfs_getattr,
+ .setattr = v9fs_vfs_setattr,
+};
+
+static struct inode_operations v9fs_symlink_inode_operations = {
+ .readlink = v9fs_vfs_readlink,
+ .follow_link = v9fs_vfs_follow_link,
+ .put_link = v9fs_vfs_put_link,
+ .getattr = v9fs_vfs_getattr,
+ .setattr = v9fs_vfs_setattr,
+};