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27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/inet.h>
35#include <linux/pagemap.h>
36#include <linux/seq_file.h>
37#include <linux/mount.h>
38#include <linux/idr.h>
39#include <linux/sched.h>
40#include <net/9p/9p.h>
41#include <net/9p/client.h>
42
43#include "v9fs.h"
44#include "v9fs_vfs.h"
45#include "fid.h"
46
47static const struct super_operations v9fs_super_ops;
48
49
50
51
52
53
54
55
56static int v9fs_set_super(struct super_block *s, void *data)
57{
58 s->s_fs_info = data;
59 return set_anon_super(s, data);
60}
61
62
63
64
65
66
67
68
69
70static void
71v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
72 int flags, void *data)
73{
74 sb->s_maxbytes = MAX_LFS_FILESIZE;
75 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
76 sb->s_blocksize = 1 << sb->s_blocksize_bits;
77 sb->s_magic = V9FS_MAGIC;
78 sb->s_op = &v9fs_super_ops;
79
80 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
81 MS_NOATIME;
82
83 save_mount_options(sb, data);
84}
85
86
87
88
89
90
91
92
93
94
95
96static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
97 const char *dev_name, void *data,
98 struct vfsmount *mnt)
99{
100 struct super_block *sb = NULL;
101 struct inode *inode = NULL;
102 struct dentry *root = NULL;
103 struct v9fs_session_info *v9ses = NULL;
104 struct p9_wstat *st = NULL;
105 int mode = S_IRWXUGO | S_ISVTX;
106 struct p9_fid *fid;
107 int retval = 0;
108
109 P9_DPRINTK(P9_DEBUG_VFS, " \n");
110
111 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
112 if (!v9ses)
113 return -ENOMEM;
114
115 fid = v9fs_session_init(v9ses, dev_name, data);
116 if (IS_ERR(fid)) {
117 retval = PTR_ERR(fid);
118 goto close_session;
119 }
120
121 st = p9_client_stat(fid);
122 if (IS_ERR(st)) {
123 retval = PTR_ERR(st);
124 goto clunk_fid;
125 }
126
127 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
128 if (IS_ERR(sb)) {
129 retval = PTR_ERR(sb);
130 goto free_stat;
131 }
132 v9fs_fill_super(sb, v9ses, flags, data);
133
134 inode = v9fs_get_inode(sb, S_IFDIR | mode);
135 if (IS_ERR(inode)) {
136 retval = PTR_ERR(inode);
137 goto release_sb;
138 }
139
140 root = d_alloc_root(inode);
141 if (!root) {
142 iput(inode);
143 retval = -ENOMEM;
144 goto release_sb;
145 }
146
147 sb->s_root = root;
148 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
149
150 v9fs_stat2inode(st, root->d_inode, sb);
151
152 v9fs_fid_add(root, fid);
153 p9stat_free(st);
154 kfree(st);
155
156P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
157 simple_set_mnt(mnt, sb);
158 return 0;
159
160free_stat:
161 p9stat_free(st);
162 kfree(st);
163
164clunk_fid:
165 p9_client_clunk(fid);
166
167close_session:
168 v9fs_session_close(v9ses);
169 kfree(v9ses);
170 return retval;
171
172release_sb:
173 p9stat_free(st);
174 kfree(st);
175 deactivate_locked_super(sb);
176 return retval;
177}
178
179
180
181
182
183
184
185static void v9fs_kill_super(struct super_block *s)
186{
187 struct v9fs_session_info *v9ses = s->s_fs_info;
188
189 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
190
191 v9fs_dentry_release(s->s_root);
192
193 kill_anon_super(s);
194
195 v9fs_session_close(v9ses);
196 kfree(v9ses);
197 s->s_fs_info = NULL;
198 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
199}
200
201static void
202v9fs_umount_begin(struct super_block *sb)
203{
204 struct v9fs_session_info *v9ses;
205
206 v9ses = sb->s_fs_info;
207 v9fs_session_cancel(v9ses);
208}
209
210static const struct super_operations v9fs_super_ops = {
211#ifdef CONFIG_9P_FSCACHE
212 .alloc_inode = v9fs_alloc_inode,
213 .destroy_inode = v9fs_destroy_inode,
214#endif
215 .statfs = simple_statfs,
216 .clear_inode = v9fs_clear_inode,
217 .show_options = generic_show_options,
218 .umount_begin = v9fs_umount_begin,
219};
220
221struct file_system_type v9fs_fs_type = {
222 .name = "9p",
223 .get_sb = v9fs_get_sb,
224 .kill_sb = v9fs_kill_super,
225 .owner = THIS_MODULE,
226};
227