From 9e82cf6a802a72f0f447eb4c76d6a3fc8736a31d Mon Sep 17 00:00:00 2001 From: Eric Van Hensbergen Date: Fri, 9 Sep 2005 13:04:20 -0700 Subject: [PATCH] [PATCH] v9fs: VFS superblock operations and glue This part of the patch contains VFS superblock and mapping code. Signed-off-by: Eric Van Hensbergen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/9p/v9fs.c | 448 ++++++++++++++++++++++++++++++++++++++++++++++ fs/9p/v9fs.h | 105 +++++++++++ fs/9p/v9fs_vfs.h | 53 ++++++ fs/9p/vfs_super.c | 271 ++++++++++++++++++++++++++++ 4 files changed, 877 insertions(+) create mode 100644 fs/9p/v9fs.c create mode 100644 fs/9p/v9fs.h create mode 100644 fs/9p/v9fs_vfs.h create mode 100644 fs/9p/vfs_super.c diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c new file mode 100644 index 00000000000..14d663ebfcb --- /dev/null +++ b/fs/9p/v9fs.c @@ -0,0 +1,448 @@ +/* + * linux/fs/9p/v9fs.c + * + * This file contains functions assisting in mapping VFS to 9P2000 + * + * Copyright (C) 2004 by Eric Van Hensbergen + * Copyright (C) 2002 by Ron Minnich + * + * 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: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#include +#include +#include +#include +#include +#include + +#include "debug.h" +#include "v9fs.h" +#include "9p.h" +#include "v9fs_vfs.h" +#include "transport.h" +#include "mux.h" +#include "conv.h" + +/* TODO: sysfs or debugfs interface */ +int v9fs_debug_level = 0; /* feature-rific global debug level */ + +/* + * Option Parsing (code inspired by NFS code) + * + */ + +enum { + /* Options that take integer arguments */ + Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug, + Opt_rfdno, Opt_wfdno, + /* String options */ + Opt_name, Opt_remotename, + /* Options that take no arguments */ + Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, + /* Error token */ + Opt_err +}; + +static match_table_t tokens = { + {Opt_port, "port=%u"}, + {Opt_msize, "msize=%u"}, + {Opt_uid, "uid=%u"}, + {Opt_gid, "gid=%u"}, + {Opt_afid, "afid=%u"}, + {Opt_rfdno, "rfdno=%u"}, + {Opt_wfdno, "wfdno=%u"}, + {Opt_debug, "debug=%u"}, + {Opt_name, "name=%s"}, + {Opt_remotename, "aname=%s"}, + {Opt_unix, "proto=unix"}, + {Opt_tcp, "proto=tcp"}, + {Opt_fd, "proto=fd"}, + {Opt_tcp, "tcp"}, + {Opt_unix, "unix"}, + {Opt_fd, "fd"}, + {Opt_legacy, "noextend"}, + {Opt_nodevmap, "nodevmap"}, + {Opt_err, NULL} +}; + +/* + * Parse option string. + */ + +/** + * v9fs_parse_options - parse mount options into session structure + * @options: options string passed from mount + * @v9ses: existing v9fs session information + * + */ + +static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses) +{ + char *p; + substring_t args[MAX_OPT_ARGS]; + int option; + int ret; + + /* setup defaults */ + v9ses->port = V9FS_PORT; + v9ses->maxdata = 9000; + v9ses->proto = PROTO_TCP; + v9ses->extended = 1; + v9ses->afid = ~0; + v9ses->debug = 0; + v9ses->rfdno = ~0; + v9ses->wfdno = ~0; + + if (!options) + return; + + while ((p = strsep(&options, ",")) != NULL) { + int token; + if (!*p) + continue; + token = match_token(p, tokens, args); + if (token < Opt_name) { + if ((ret = match_int(&args[0], &option)) < 0) { + dprintk(DEBUG_ERROR, + "integer field, but no integer?\n"); + continue; + } + + } + switch (token) { + case Opt_port: + v9ses->port = option; + break; + case Opt_msize: + v9ses->maxdata = option; + break; + case Opt_uid: + v9ses->uid = option; + break; + case Opt_gid: + v9ses->gid = option; + break; + case Opt_afid: + v9ses->afid = option; + break; + case Opt_rfdno: + v9ses->rfdno = option; + break; + case Opt_wfdno: + v9ses->wfdno = option; + break; + case Opt_debug: + v9ses->debug = option; + break; + case Opt_tcp: + v9ses->proto = PROTO_TCP; + break; + case Opt_unix: + v9ses->proto = PROTO_UNIX; + break; + case Opt_fd: + v9ses->proto = PROTO_FD; + break; + case Opt_name: + match_strcpy(v9ses->name, &args[0]); + break; + case Opt_remotename: + match_strcpy(v9ses->remotename, &args[0]); + break; + case Opt_legacy: + v9ses->extended = 0; + break; + case Opt_nodevmap: + v9ses->nodev = 1; + break; + default: + continue; + } + } +} + +/** + * v9fs_inode2v9ses - safely extract v9fs session info from super block + * @inode: inode to extract information from + * + * Paranoid function to extract v9ses information from superblock, + * if anything is missing it will report an error. + * + */ + +struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) +{ + return (inode->i_sb->s_fs_info); +} + +/** + * v9fs_get_idpool - allocate numeric id from pool + * @p - pool to allocate from + * + * XXX - This seems to be an awful generic function, should it be in idr.c with + * the lock included in struct idr? + */ + +int v9fs_get_idpool(struct v9fs_idpool *p) +{ + int i = 0; + int error; + +retry: + if (idr_pre_get(&p->pool, GFP_KERNEL) == 0) + return 0; + + if (down_interruptible(&p->lock) == -EINTR) { + eprintk(KERN_WARNING, "Interrupted while locking\n"); + return -1; + } + + error = idr_get_new(&p->pool, NULL, &i); + up(&p->lock); + + if (error == -EAGAIN) + goto retry; + else if (error) + return -1; + + return i; +} + +/** + * v9fs_put_idpool - release numeric id from pool + * @p - pool to allocate from + * + * XXX - This seems to be an awful generic function, should it be in idr.c with + * the lock included in struct idr? + */ + +void v9fs_put_idpool(int id, struct v9fs_idpool *p) +{ + if (down_interruptible(&p->lock) == -EINTR) { + eprintk(KERN_WARNING, "Interrupted while locking\n"); + return; + } + idr_remove(&p->pool, id); + up(&p->lock); +} + +/** + * v9fs_session_init - initialize session + * @v9ses: session information structure + * @dev_name: device being mounted + * @data: options + * + */ + +int +v9fs_session_init(struct v9fs_session_info *v9ses, + const char *dev_name, char *data) +{ + struct v9fs_fcall *fcall = NULL; + struct v9fs_transport *trans_proto; + int n = 0; + int newfid = -1; + int retval = -EINVAL; + + v9ses->name = __getname(); + if (!v9ses->name) + return -ENOMEM; + + v9ses->remotename = __getname(); + if (!v9ses->remotename) { + putname(v9ses->name); + return -ENOMEM; + } + + strcpy(v9ses->name, V9FS_DEFUSER); + strcpy(v9ses->remotename, V9FS_DEFANAME); + + v9fs_parse_options(data, v9ses); + + /* set global debug level */ + v9fs_debug_level = v9ses->debug; + + /* id pools that are session-dependent: FIDs and TIDs */ + idr_init(&v9ses->fidpool.pool); + init_MUTEX(&v9ses->fidpool.lock); + idr_init(&v9ses->tidpool.pool); + init_MUTEX(&v9ses->tidpool.lock); + + + switch (v9ses->proto) { + case PROTO_TCP: + trans_proto = &v9fs_trans_tcp; + break; + case PROTO_UNIX: + trans_proto = &v9fs_trans_unix; + *v9ses->remotename = 0; + break; + case PROTO_FD: + trans_proto = &v9fs_trans_fd; + *v9ses->remotename = 0; + if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) { + printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); + retval = -ENOPROTOOPT; + goto SessCleanUp; + } + break; + default: + printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto); + retval = -ENOPROTOOPT; + goto SessCleanUp; + }; + + v9ses->transport = trans_proto; + + if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) { + eprintk(KERN_ERR, "problem initializing transport\n"); + goto SessCleanUp; + } + + v9ses->inprogress = 0; + v9ses->shutdown = 0; + v9ses->session_hung = 0; + + if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) { + dprintk(DEBUG_ERROR, "problem initializing mux\n"); + goto SessCleanUp; + } + + if (v9ses->afid == ~0) { + if (v9ses->extended) + retval = + v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u", + &fcall); + else + retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000", + &fcall); + + if (retval < 0) { + dprintk(DEBUG_ERROR, "v9fs_t_version failed\n"); + goto FreeFcall; + } + + /* Really should check for 9P1 and report error */ + if (!strcmp(fcall->params.rversion.version, "9P2000.u")) { + dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n"); + v9ses->extended = 1; + } else { + dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n"); + v9ses->extended = 0; + } + + n = fcall->params.rversion.msize; + kfree(fcall); + + if (n < v9ses->maxdata) + v9ses->maxdata = n; + } + + newfid = v9fs_get_idpool(&v9ses->fidpool); + if (newfid < 0) { + eprintk(KERN_WARNING, "couldn't allocate FID\n"); + retval = -ENOMEM; + goto SessCleanUp; + } + /* it is a little bit ugly, but we have to prevent newfid */ + /* being the same as afid, so if it is, get a new fid */ + if (v9ses->afid != ~0 && newfid == v9ses->afid) { + newfid = v9fs_get_idpool(&v9ses->fidpool); + if (newfid < 0) { + eprintk(KERN_WARNING, "couldn't allocate FID\n"); + retval = -ENOMEM; + goto SessCleanUp; + } + } + + if ((retval = + v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid, + v9ses->afid, NULL)) + < 0) { + dprintk(DEBUG_ERROR, "cannot attach\n"); + goto SessCleanUp; + } + + if (v9ses->afid != ~0) { + if (v9fs_t_clunk(v9ses, v9ses->afid, NULL)) + dprintk(DEBUG_ERROR, "clunk failed\n"); + } + + return newfid; + + FreeFcall: + kfree(fcall); + + SessCleanUp: + v9fs_session_close(v9ses); + return retval; +} + +/** + * v9fs_session_close - shutdown a session + * @v9ses: session information structure + * + */ + +void v9fs_session_close(struct v9fs_session_info *v9ses) +{ + if (v9ses->recvproc) { + send_sig(SIGKILL, v9ses->recvproc, 1); + wait_for_completion(&v9ses->proccmpl); + } + + if (v9ses->transport) + v9ses->transport->close(v9ses->transport); + + putname(v9ses->name); + putname(v9ses->remotename); +} + +extern int v9fs_error_init(void); + +/** + * v9fs_init - Initialize module + * + */ + +static int __init init_v9fs(void) +{ + v9fs_error_init(); + + printk(KERN_INFO "Installing v9fs 9P2000 file system support\n"); + + return register_filesystem(&v9fs_fs_type); +} + +/** + * v9fs_init - shutdown module + * + */ + +static void __exit exit_v9fs(void) +{ + unregister_filesystem(&v9fs_fs_type); +} + +module_init(init_v9fs) +module_exit(exit_v9fs) + +MODULE_AUTHOR("Eric Van Hensbergen "); +MODULE_AUTHOR("Ron Minnich "); +MODULE_LICENSE("GPL"); diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h new file mode 100644 index 00000000000..52203027b15 --- /dev/null +++ b/fs/9p/v9fs.h @@ -0,0 +1,105 @@ +/* + * V9FS definitions. + * + * Copyright (C) 2004 by Eric Van Hensbergen + * Copyright (C) 2002 by Ron Minnich + * + * 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: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +/* + * Idpool structure provides lock and id management + * + */ + +struct v9fs_idpool { + struct semaphore lock; + struct idr pool; +}; + +/* + * Session structure provides information for an opened session + * + */ + +struct v9fs_session_info { + /* options */ + unsigned int maxdata; + unsigned char extended; /* set to 1 if we are using UNIX extensions */ + unsigned char nodev; /* set to 1 if no disable device mapping */ + unsigned short port; /* port to connect to */ + unsigned short debug; /* debug level */ + unsigned short proto; /* protocol to use */ + unsigned int afid; /* authentication fid */ + unsigned int rfdno; /* read file descriptor number */ + unsigned int wfdno; /* write file descriptor number */ + + + char *name; /* user name to mount as */ + char *remotename; /* name of remote hierarchy being mounted */ + unsigned int uid; /* default uid/muid for legacy support */ + unsigned int gid; /* default gid for legacy support */ + + /* book keeping */ + struct v9fs_idpool fidpool; /* The FID pool for file descriptors */ + struct v9fs_idpool tidpool; /* The TID pool for transactions ids */ + + /* transport information */ + struct v9fs_transport *transport; + + int inprogress; /* session in progress => true */ + int shutdown; /* session shutting down. no more attaches. */ + unsigned char session_hung; + + /* mux private data */ + struct v9fs_fcall *curfcall; + wait_queue_head_t read_wait; + struct completion fcread; + struct completion proccmpl; + struct task_struct *recvproc; + + spinlock_t muxlock; + struct list_head mux_fcalls; +}; + +/* possible values of ->proto */ +enum { + PROTO_TCP, + PROTO_UNIX, + PROTO_FD, +}; + +int v9fs_session_init(struct v9fs_session_info *, const char *, char *); +struct v9fs_session_info *v9fs_inode2v9ses(struct inode *); +void v9fs_session_close(struct v9fs_session_info *v9ses); +int v9fs_get_idpool(struct v9fs_idpool *p); +void v9fs_put_idpool(int id, struct v9fs_idpool *p); +int v9fs_get_option(char *opts, char *name, char *buf, int buflen); +long long v9fs_get_int_option(char *opts, char *name, long long dflt); +int v9fs_parse_tcp_devname(const char *devname, char **addr, char **remotename); + +#define V9FS_MAGIC 0x01021997 + +/* other default globals */ +#define V9FS_PORT 564 +#define V9FS_DEFUSER "nobody" +#define V9FS_DEFANAME "" + +/* inital pool sizes for fids and tags */ +#define V9FS_START_FIDS 8192 +#define V9FS_START_TIDS 256 diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h new file mode 100644 index 00000000000..2f2cea7ee3e --- /dev/null +++ b/fs/9p/v9fs_vfs.h @@ -0,0 +1,53 @@ +/* + * V9FS VFS extensions. + * + * Copyright (C) 2004 by Eric Van Hensbergen + * Copyright (C) 2002 by Ron Minnich + * + * 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: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +/* plan9 semantics are that created files are implicitly opened. + * But linux semantics are that you call create, then open. + * the plan9 approach is superior as it provides an atomic + * open. + * we track the create fid here. When the file is opened, if fidopen is + * non-zero, we use the fid and can skip some steps. + * there may be a better way to do this, but I don't know it. + * one BAD way is to clunk the fid on create, then open it again: + * you lose the atomicity of file open + */ + +/* special case: + * unlink calls remove, which is an implicit clunk. So we have to track + * that kind of thing so that we don't try to clunk a dead fid. + */ + +extern struct file_system_type v9fs_fs_type; +extern struct file_operations v9fs_file_operations; +extern struct file_operations v9fs_dir_operations; +extern struct dentry_operations v9fs_dentry_operations; + +struct inode *v9fs_get_inode(struct super_block *sb, int mode); +ino_t v9fs_qid2ino(struct v9fs_qid *qid); +void v9fs_mistat2inode(struct v9fs_stat *, struct inode *, + struct super_block *); +int v9fs_dir_release(struct inode *inode, struct file *filp); +int v9fs_file_open(struct inode *inode, struct file *file); +void v9fs_inode2mistat(struct inode *inode, struct v9fs_stat *mistat); +void v9fs_dentry_release(struct dentry *); diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c new file mode 100644 index 00000000000..ce0778acc90 --- /dev/null +++ b/fs/9p/vfs_super.c @@ -0,0 +1,271 @@ +/* + * linux/fs/9p/vfs_super.c + * + * This file contians superblock ops for 9P2000. It is intended that + * you mount this file system on directories. + * + * Copyright (C) 2004 by Eric Van Hensbergen + * Copyright (C) 2002 by Ron Minnich + * + * 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: + * Free Software Foundation + * 51 Franklin Street, Fifth Floor + * Boston, MA 02111-1301 USA + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "debug.h" +#include "v9fs.h" +#include "9p.h" +#include "v9fs_vfs.h" +#include "conv.h" +#include "fid.h" + +static void v9fs_clear_inode(struct inode *); +static struct super_operations v9fs_super_ops; + +/** + * v9fs_clear_inode - release an inode + * @inode: inode to release + * + */ + +static void v9fs_clear_inode(struct inode *inode) +{ + filemap_fdatawrite(inode->i_mapping); +} + +/** + * v9fs_set_super - set the superblock + * @s: super block + * @data: file system specific data + * + */ + +static int v9fs_set_super(struct super_block *s, void *data) +{ + s->s_fs_info = data; + return set_anon_super(s, data); +} + +/** + * v9fs_fill_super - populate superblock with info + * @sb: superblock + * @v9ses: session information + * + */ + +static void +v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, + int flags) +{ + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_blocksize_bits = fls(v9ses->maxdata - 1); + sb->s_blocksize = 1 << sb->s_blocksize_bits; + sb->s_magic = V9FS_MAGIC; + sb->s_op = &v9fs_super_ops; + + sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | + MS_NODIRATIME | MS_NOATIME; +} + +/** + * v9fs_get_sb - mount a superblock + * @fs_type: file system type + * @flags: mount flags + * @dev_name: device name that was mounted + * @data: mount options + * + */ + +static struct super_block *v9fs_get_sb(struct file_system_type + *fs_type, int flags, + const char *dev_name, void *data) +{ + struct super_block *sb = NULL; + struct v9fs_fcall *fcall = NULL; + struct inode *inode = NULL; + struct dentry *root = NULL; + struct v9fs_session_info *v9ses = NULL; + struct v9fs_fid *root_fid = NULL; + int mode = S_IRWXUGO | S_ISVTX; + uid_t uid = current->fsuid; + gid_t gid = current->fsgid; + int stat_result = 0; + int newfid = 0; + int retval = 0; + + dprintk(DEBUG_VFS, " \n"); + + v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL); + if (!v9ses) + return ERR_PTR(-ENOMEM); + + if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) { + dprintk(DEBUG_ERROR, "problem initiating session\n"); + retval = newfid; + goto free_session; + } + + sb = sget(fs_type, NULL, v9fs_set_super, v9ses); + + v9fs_fill_super(sb, v9ses, flags); + + inode = v9fs_get_inode(sb, S_IFDIR | mode); + if (IS_ERR(inode)) { + retval = PTR_ERR(inode); + goto put_back_sb; + } + + inode->i_uid = uid; + inode->i_gid = gid; + + root = d_alloc_root(inode); + + if (!root) { + retval = -ENOMEM; + goto release_inode; + } + + sb->s_root = root; + + /* Setup the Root Inode */ + root_fid = v9fs_fid_create(root); + if (root_fid == NULL) { + retval = -ENOMEM; + goto release_dentry; + } + + root_fid->fidopen = 0; + root_fid->v9ses = v9ses; + + stat_result = v9fs_t_stat(v9ses, newfid, &fcall); + if (stat_result < 0) { + dprintk(DEBUG_ERROR, "stat error\n"); + v9fs_t_clunk(v9ses, newfid, NULL); + v9fs_put_idpool(newfid, &v9ses->fidpool); + } else { + root_fid->fid = newfid; + root_fid->qid = fcall->params.rstat.stat->qid; + root->d_inode->i_ino = + v9fs_qid2ino(&fcall->params.rstat.stat->qid); + v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb); + } + + kfree(fcall); + + if (stat_result < 0) { + retval = stat_result; + goto release_dentry; + } + + return sb; + + release_dentry: + dput(sb->s_root); + + release_inode: + iput(inode); + + put_back_sb: + up_write(&sb->s_umount); + deactivate_super(sb); + v9fs_session_close(v9ses); + + free_session: + kfree(v9ses); + + return ERR_PTR(retval); +} + +/** + * v9fs_kill_super - Kill Superblock + * @s: superblock + * + */ + +static void v9fs_kill_super(struct super_block *s) +{ + struct v9fs_session_info *v9ses = s->s_fs_info; + + dprintk(DEBUG_VFS, " %p\n", s); + + v9fs_dentry_release(s->s_root); /* clunk root */ + + kill_anon_super(s); + + v9fs_session_close(v9ses); + kfree(v9ses); + dprintk(DEBUG_VFS, "exiting kill_super\n"); +} + +/** + * v9fs_show_options - Show mount options in /proc/mounts + * @m: seq_file to write to + * @mnt: mount descriptor + * + */ + +static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) +{ + struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; + + if (v9ses->debug != 0) + seq_printf(m, ",debug=%u", v9ses->debug); + if (v9ses->port != V9FS_PORT) + seq_printf(m, ",port=%u", v9ses->port); + if (v9ses->maxdata != 9000) + seq_printf(m, ",msize=%u", v9ses->maxdata); + if (v9ses->afid != ~0) + seq_printf(m, ",afid=%u", v9ses->afid); + if (v9ses->proto == PROTO_UNIX) + seq_puts(m, ",proto=unix"); + if (v9ses->extended == 0) + seq_puts(m, ",noextend"); + if (v9ses->nodev == 1) + seq_puts(m, ",nodevmap"); + seq_printf(m, ",name=%s", v9ses->name); + seq_printf(m, ",aname=%s", v9ses->remotename); + seq_printf(m, ",uid=%u", v9ses->uid); + seq_printf(m, ",gid=%u", v9ses->gid); + return 0; +} + +static struct super_operations v9fs_super_ops = { + .statfs = simple_statfs, + .clear_inode = v9fs_clear_inode, + .show_options = v9fs_show_options, +}; + +struct file_system_type v9fs_fs_type = { + .name = "9P", + .get_sb = v9fs_get_sb, + .kill_sb = v9fs_kill_super, + .owner = THIS_MODULE, +}; -- 2.41.1