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9p: Implement show_options

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Implement the show_options superblock op for 9p as part of a bid to get
rid of s_options and generic_show_options() to make it easier to implement
a context-based mount where the mount options can be passed individually
over a file descriptor.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Ron Minnich <rminnich@sandia.gov>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: v9fs-developer@lists.sourceforge.net
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2017-07-05 16:25:37 +01:00 committed by Al Viro
parent 86a1da6d30
commit c4fac91004
8 changed files with 161 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

61
fs/9p/v9fs.c
View file

@ -33,6 +33,7 @@
#include <linux/parser.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
@ -82,6 +83,13 @@ static const match_table_t tokens = {
{Opt_err, NULL}
};
static const char *const v9fs_cache_modes[nr__p9_cache_modes] = {
[CACHE_NONE] = "none",
[CACHE_MMAP] = "mmap",
[CACHE_LOOSE] = "loose",
[CACHE_FSCACHE] = "fscache",
};
/* Interpret mount options for cache mode */
static int get_cache_mode(char *s)
{
@ -104,6 +112,58 @@ static int get_cache_mode(char *s)
return version;
}
/*
* Display the mount options in /proc/mounts.
*/
int v9fs_show_options(struct seq_file *m, struct dentry *root)
{
struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
if (v9ses->debug)
seq_printf(m, ",debug=%x", v9ses->debug);
if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))
seq_printf(m, ",dfltuid=%u",
from_kuid_munged(&init_user_ns, v9ses->dfltuid));
if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID))
seq_printf(m, ",dfltgid=%u",
from_kgid_munged(&init_user_ns, v9ses->dfltgid));
if (v9ses->afid != ~0)
seq_printf(m, ",afid=%u", v9ses->afid);
if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)
seq_printf(m, ",uname=%s", v9ses->uname);
if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)
seq_printf(m, ",aname=%s", v9ses->aname);
if (v9ses->nodev)
seq_puts(m, ",nodevmap");
if (v9ses->cache)
seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]);
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE)
seq_printf(m, ",cachetag=%s", v9ses->cachetag);
#endif
switch (v9ses->flags & V9FS_ACCESS_MASK) {
case V9FS_ACCESS_USER:
seq_puts(m, ",access=user");
break;
case V9FS_ACCESS_ANY:
seq_puts(m, ",access=any");
break;
case V9FS_ACCESS_CLIENT:
seq_puts(m, ",access=client");
break;
case V9FS_ACCESS_SINGLE:
seq_printf(m, ",access=%u",
from_kuid_munged(&init_user_ns, v9ses->uid));
break;
}
if (v9ses->flags & V9FS_POSIX_ACL)
seq_puts(m, ",posixacl");
return p9_show_client_options(m, v9ses->clnt);
}
/**
* v9fs_parse_options - parse mount options into session structure
* @v9ses: existing v9fs session information
@ -230,6 +290,7 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
break;
case Opt_cachetag:
#ifdef CONFIG_9P_FSCACHE
kfree(v9ses->cachetag);
v9ses->cachetag = match_strdup(&args[0]);
#endif
break;

3
fs/9p/v9fs.h
View file

@ -67,6 +67,7 @@ enum p9_cache_modes {
CACHE_MMAP,
CACHE_LOOSE,
CACHE_FSCACHE,
nr__p9_cache_modes
};
/**
@ -137,6 +138,8 @@ static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
return container_of(inode, struct v9fs_inode, vfs_inode);
}
extern int v9fs_show_options(struct seq_file *m, struct dentry *root);
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
char *);
extern void v9fs_session_close(struct v9fs_session_info *v9ses);

6
fs/9p/vfs_super.c
View file

@ -33,7 +33,6 @@
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/idr.h>
#include <linux/sched.h>
@ -104,7 +103,6 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
sb->s_flags |= MS_POSIXACL;
#endif
save_mount_options(sb, data);
return 0;
}
@ -349,7 +347,7 @@ static const struct super_operations v9fs_super_ops = {
.destroy_inode = v9fs_destroy_inode,
.statfs = simple_statfs,
.evict_inode = v9fs_evict_inode,
.show_options = generic_show_options,
.show_options = v9fs_show_options,
.umount_begin = v9fs_umount_begin,
.write_inode = v9fs_write_inode,
};
@ -360,7 +358,7 @@ static const struct super_operations v9fs_super_ops_dotl = {
.statfs = v9fs_statfs,
.drop_inode = v9fs_drop_inode,
.evict_inode = v9fs_evict_inode,
.show_options = generic_show_options,
.show_options = v9fs_show_options,
.umount_begin = v9fs_umount_begin,
.write_inode = v9fs_write_inode_dotl,
};

13
include/net/9p/client.h
View file

@ -157,6 +157,18 @@ struct p9_client {
enum p9_trans_status status;
void *trans;
union {
struct {
int rfd;
int wfd;
} fd;
struct {
u16 port;
bool privport;
} tcp;
} trans_opts;
struct p9_idpool *fidpool;
struct list_head fidlist;
@ -213,6 +225,7 @@ struct p9_dirent {
struct iov_iter;
int p9_show_client_options(struct seq_file *m, struct p9_client *clnt);
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb);
int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid,
const char *name);

1
include/net/9p/transport.h
View file

@ -62,6 +62,7 @@ struct p9_trans_module {
int (*cancelled)(struct p9_client *, struct p9_req_t *req);
int (*zc_request)(struct p9_client *, struct p9_req_t *,
struct iov_iter *, struct iov_iter *, int , int, int);
int (*show_options)(struct seq_file *, struct p9_client *);
};
void v9fs_register_trans(struct p9_trans_module *m);

25
net/9p/client.c
View file

@ -37,6 +37,7 @@
#include <linux/uio.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
#include "protocol.h"
@ -77,6 +78,30 @@ inline int p9_is_proto_dotu(struct p9_client *clnt)
}
EXPORT_SYMBOL(p9_is_proto_dotu);
int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
{
if (clnt->msize != 8192)
seq_printf(m, ",msize=%u", clnt->msize);
seq_printf(m, "trans=%s", clnt->trans_mod->name);
switch (clnt->proto_version) {
case p9_proto_legacy:
seq_puts(m, ",noextend");
break;
case p9_proto_2000u:
seq_puts(m, ",version=9p2000.u");
break;
case p9_proto_2000L:
/* Default */
break;
}
if (clnt->trans_mod->show_options)
return clnt->trans_mod->show_options(m, clnt);
return 0;
}
EXPORT_SYMBOL(p9_show_client_options);
/*
* Some error codes are taken directly from the server replies,
* make sure they are valid.

31
net/9p/trans_fd.c
View file

@ -41,6 +41,7 @@
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
@ -51,6 +52,9 @@
#define MAX_SOCK_BUF (64*1024)
#define MAXPOLLWADDR 2
static struct p9_trans_module p9_tcp_trans;
static struct p9_trans_module p9_fd_trans;
/**
* struct p9_fd_opts - per-transport options
* @rfd: file descriptor for reading (trans=fd)
@ -63,7 +67,7 @@ struct p9_fd_opts {
int rfd;
int wfd;
u16 port;
int privport;
bool privport;
};
/*
@ -720,6 +724,20 @@ static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
return 0;
}
static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)
{
if (clnt->trans_mod == &p9_tcp_trans) {
if (clnt->trans_opts.tcp.port != P9_PORT)
seq_printf(m, "port=%u", clnt->trans_opts.tcp.port);
} else if (clnt->trans_mod == &p9_fd_trans) {
if (clnt->trans_opts.fd.rfd != ~0)
seq_printf(m, "rfd=%u", clnt->trans_opts.fd.rfd);
if (clnt->trans_opts.fd.wfd != ~0)
seq_printf(m, "wfd=%u", clnt->trans_opts.fd.wfd);
}
return 0;
}
/**
* parse_opts - parse mount options into p9_fd_opts structure
* @params: options string passed from mount
@ -738,7 +756,7 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
opts->port = P9_PORT;
opts->rfd = ~0;
opts->wfd = ~0;
opts->privport = 0;
opts->privport = false;
if (!params)
return 0;
@ -776,7 +794,7 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
opts->wfd = option;
break;
case Opt_privport:
opts->privport = 1;
opts->privport = true;
break;
default:
continue;
@ -942,6 +960,8 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
csocket = NULL;
client->trans_opts.tcp.port = opts.port;
client->trans_opts.tcp.privport = opts.privport;
sin_server.sin_family = AF_INET;
sin_server.sin_addr.s_addr = in_aton(addr);
sin_server.sin_port = htons(opts.port);
@ -1020,6 +1040,8 @@ p9_fd_create(struct p9_client *client, const char *addr, char *args)
struct p9_fd_opts opts;
parse_opts(args, &opts);
client->trans_opts.fd.rfd = opts.rfd;
client->trans_opts.fd.wfd = opts.wfd;
if (opts.rfd == ~0 || opts.wfd == ~0) {
pr_err("Insufficient options for proto=fd\n");
@ -1044,6 +1066,7 @@ static struct p9_trans_module p9_tcp_trans = {
.request = p9_fd_request,
.cancel = p9_fd_cancel,
.cancelled = p9_fd_cancelled,
.show_options = p9_fd_show_options,
.owner = THIS_MODULE,
};
@ -1056,6 +1079,7 @@ static struct p9_trans_module p9_unix_trans = {
.request = p9_fd_request,
.cancel = p9_fd_cancel,
.cancelled = p9_fd_cancelled,
.show_options = p9_fd_show_options,
.owner = THIS_MODULE,
};
@ -1068,6 +1092,7 @@ static struct p9_trans_module p9_fd_trans = {
.request = p9_fd_request,
.cancel = p9_fd_cancel,
.cancelled = p9_fd_cancelled,
.show_options = p9_fd_show_options,
.owner = THIS_MODULE,
};

31
net/9p/trans_rdma.c
View file

@ -43,6 +43,7 @@
#include <linux/parser.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
@ -70,6 +71,8 @@
* @dm_mr: DMA Memory Region pointer
* @lkey: The local access only memory region key
* @timeout: Number of uSecs to wait for connection management events
* @privport: Whether a privileged port may be used
* @port: The port to use
* @sq_depth: The depth of the Send Queue
* @sq_sem: Semaphore for the SQ
* @rq_depth: The depth of the Receive Queue.
@ -95,6 +98,8 @@ struct p9_trans_rdma {
struct ib_qp *qp;
struct ib_cq *cq;
long timeout;
bool privport;
u16 port;
int sq_depth;
struct semaphore sq_sem;
int rq_depth;
@ -133,10 +138,10 @@ struct p9_rdma_context {
*/
struct p9_rdma_opts {
short port;
bool privport;
int sq_depth;
int rq_depth;
long timeout;
int privport;
};
/*
@ -159,6 +164,23 @@ static match_table_t tokens = {
{Opt_err, NULL},
};
static int p9_rdma_show_options(struct seq_file *m, struct p9_client *clnt)
{
struct p9_trans_rdma *rdma = clnt->trans;
if (rdma->port != P9_PORT)
seq_printf(m, ",port=%u", rdma->port);
if (rdma->sq_depth != P9_RDMA_SQ_DEPTH)
seq_printf(m, ",sq=%u", rdma->sq_depth);
if (rdma->rq_depth != P9_RDMA_RQ_DEPTH)
seq_printf(m, ",rq=%u", rdma->rq_depth);
if (rdma->timeout != P9_RDMA_TIMEOUT)
seq_printf(m, ",timeout=%lu", rdma->timeout);
if (rdma->privport)
seq_puts(m, ",privport");
return 0;
}
/**
* parse_opts - parse mount options into rdma options structure
* @params: options string passed from mount
@ -177,7 +199,7 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
opts->sq_depth = P9_RDMA_SQ_DEPTH;
opts->rq_depth = P9_RDMA_RQ_DEPTH;
opts->timeout = P9_RDMA_TIMEOUT;
opts->privport = 0;
opts->privport = false;
if (!params)
return 0;
@ -218,7 +240,7 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
opts->timeout = option;
break;
case Opt_privport:
opts->privport = 1;
opts->privport = true;
break;
default:
continue;
@ -560,6 +582,8 @@ static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts)
if (!rdma)
return NULL;
rdma->port = opts->port;
rdma->privport = opts->privport;
rdma->sq_depth = opts->sq_depth;
rdma->rq_depth = opts->rq_depth;
rdma->timeout = opts->timeout;
@ -733,6 +757,7 @@ static struct p9_trans_module p9_rdma_trans = {
.request = rdma_request,
.cancel = rdma_cancel,
.cancelled = rdma_cancelled,
.show_options = p9_rdma_show_options,
};
/**