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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9e82cf6a | 2 | /* |
9e82cf6a EVH |
3 | * |
4 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
5 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
9e82cf6a EVH |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9e82cf6a EVH |
9 | #include <linux/module.h> |
10 | #include <linux/errno.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/string.h> | |
9e82cf6a | 15 | #include <linux/pagemap.h> |
9e82cf6a | 16 | #include <linux/mount.h> |
e8edc6e0 | 17 | #include <linux/sched.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bda8e775 | 19 | #include <linux/statfs.h> |
368c09d2 | 20 | #include <linux/magic.h> |
93c84614 | 21 | #include <linux/fscache.h> |
bd238fb4 LI |
22 | #include <net/9p/9p.h> |
23 | #include <net/9p/client.h> | |
9e82cf6a | 24 | |
9e82cf6a | 25 | #include "v9fs.h" |
9e82cf6a | 26 | #include "v9fs_vfs.h" |
9e82cf6a | 27 | #include "fid.h" |
ebf46264 | 28 | #include "xattr.h" |
85ff872d | 29 | #include "acl.h" |
9e82cf6a | 30 | |
9b6533c9 | 31 | static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
9e82cf6a | 32 | |
9e82cf6a EVH |
33 | /** |
34 | * v9fs_set_super - set the superblock | |
35 | * @s: super block | |
36 | * @data: file system specific data | |
37 | * | |
38 | */ | |
39 | ||
40 | static int v9fs_set_super(struct super_block *s, void *data) | |
41 | { | |
42 | s->s_fs_info = data; | |
43 | return set_anon_super(s, data); | |
44 | } | |
45 | ||
46 | /** | |
47 | * v9fs_fill_super - populate superblock with info | |
48 | * @sb: superblock | |
49 | * @v9ses: session information | |
d2d1ea93 | 50 | * @flags: flags propagated from v9fs_mount() |
9e82cf6a EVH |
51 | * |
52 | */ | |
53 | ||
71304feb | 54 | static int |
9e82cf6a | 55 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
aafee43b | 56 | int flags) |
9e82cf6a | 57 | { |
71304feb JK |
58 | int ret; |
59 | ||
9e82cf6a EVH |
60 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
61 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
62 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
63 | sb->s_magic = V9FS_MAGIC; | |
ebf46264 | 64 | if (v9fs_proto_dotl(v9ses)) { |
9b6533c9 | 65 | sb->s_op = &v9fs_super_ops_dotl; |
8142db4f EVH |
66 | if (!(v9ses->flags & V9FS_NO_XATTR)) |
67 | sb->s_xattr = v9fs_xattr_handlers; | |
d5c6e2d5 | 68 | } else { |
9b6533c9 | 69 | sb->s_op = &v9fs_super_ops; |
d5c6e2d5 DD |
70 | sb->s_time_max = U32_MAX; |
71 | } | |
72 | ||
73 | sb->s_time_min = 0; | |
71304feb JK |
74 | |
75 | ret = super_setup_bdi(sb); | |
76 | if (ret) | |
77 | return ret; | |
78 | ||
55b2598e CH |
79 | if (!v9ses->cache) { |
80 | sb->s_bdi->ra_pages = 0; | |
81 | sb->s_bdi->io_pages = 0; | |
b1843d23 DM |
82 | } else { |
83 | sb->s_bdi->ra_pages = v9ses->maxdata >> PAGE_SHIFT; | |
84 | sb->s_bdi->io_pages = v9ses->maxdata >> PAGE_SHIFT; | |
55b2598e | 85 | } |
9e82cf6a | 86 | |
740b8bf8 | 87 | sb->s_flags |= SB_ACTIVE; |
4b53e4b5 | 88 | |
85ff872d | 89 | #ifdef CONFIG_9P_FS_POSIX_ACL |
e782ef71 | 90 | if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL) |
1751e8a6 | 91 | sb->s_flags |= SB_POSIXACL; |
85ff872d AK |
92 | #endif |
93 | ||
71304feb | 94 | return 0; |
9e82cf6a EVH |
95 | } |
96 | ||
97 | /** | |
d2d1ea93 | 98 | * v9fs_mount - mount a superblock |
9e82cf6a EVH |
99 | * @fs_type: file system type |
100 | * @flags: mount flags | |
101 | * @dev_name: device name that was mounted | |
102 | * @data: mount options | |
103 | * | |
104 | */ | |
105 | ||
d2d1ea93 AV |
106 | static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags, |
107 | const char *dev_name, void *data) | |
9e82cf6a EVH |
108 | { |
109 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
110 | struct inode *inode = NULL; |
111 | struct dentry *root = NULL; | |
112 | struct v9fs_session_info *v9ses = NULL; | |
bd238fb4 | 113 | struct p9_fid *fid; |
9e82cf6a EVH |
114 | int retval = 0; |
115 | ||
5d385153 | 116 | p9_debug(P9_DEBUG_VFS, "\n"); |
9e82cf6a | 117 | |
1dac06b2 | 118 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 119 | if (!v9ses) |
d2d1ea93 | 120 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 121 | |
bd238fb4 LI |
122 | fid = v9fs_session_init(v9ses, dev_name, data); |
123 | if (IS_ERR(fid)) { | |
124 | retval = PTR_ERR(fid); | |
412a19b6 | 125 | goto free_session; |
bd238fb4 LI |
126 | } |
127 | ||
9249e17f | 128 | sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses); |
454e2398 DH |
129 | if (IS_ERR(sb)) { |
130 | retval = PTR_ERR(sb); | |
f0853122 | 131 | goto clunk_fid; |
454e2398 | 132 | } |
aafee43b | 133 | retval = v9fs_fill_super(sb, v9ses, flags); |
71304feb JK |
134 | if (retval) |
135 | goto release_sb; | |
9e82cf6a | 136 | |
4eb31178 | 137 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) |
98cd3fb0 AV |
138 | sb->s_d_op = &v9fs_cached_dentry_operations; |
139 | else | |
140 | sb->s_d_op = &v9fs_dentry_operations; | |
141 | ||
724a0845 | 142 | inode = v9fs_get_inode_from_fid(v9ses, fid, sb); |
9e82cf6a EVH |
143 | if (IS_ERR(inode)) { |
144 | retval = PTR_ERR(inode); | |
887b3ece | 145 | goto release_sb; |
9e82cf6a | 146 | } |
df5d8c80 | 147 | |
48fde701 | 148 | root = d_make_root(inode); |
9e82cf6a EVH |
149 | if (!root) { |
150 | retval = -ENOMEM; | |
887b3ece | 151 | goto release_sb; |
9e82cf6a | 152 | } |
9e82cf6a | 153 | sb->s_root = root; |
85ff872d AK |
154 | retval = v9fs_get_acl(inode, fid); |
155 | if (retval) | |
156 | goto release_sb; | |
dafbe689 | 157 | v9fs_fid_add(root, &fid); |
9e82cf6a | 158 | |
5d385153 | 159 | p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
d2d1ea93 | 160 | return dget(sb->s_root); |
9e82cf6a | 161 | |
887b3ece | 162 | clunk_fid: |
b48dbb99 | 163 | p9_fid_put(fid); |
887b3ece | 164 | v9fs_session_close(v9ses); |
412a19b6 | 165 | free_session: |
887b3ece | 166 | kfree(v9ses); |
d2d1ea93 | 167 | return ERR_PTR(retval); |
df5d8c80 | 168 | |
1b5ab3e8 | 169 | release_sb: |
5c25f347 | 170 | /* |
df5d8c80 AK |
171 | * we will do the session_close and root dentry release |
172 | * in the below call. But we need to clunk fid, because we haven't | |
173 | * attached the fid to dentry so it won't get clunked | |
174 | * automatically. | |
5c25f347 | 175 | */ |
b48dbb99 | 176 | p9_fid_put(fid); |
1b5ab3e8 | 177 | deactivate_locked_super(sb); |
d2d1ea93 | 178 | return ERR_PTR(retval); |
9e82cf6a EVH |
179 | } |
180 | ||
181 | /** | |
182 | * v9fs_kill_super - Kill Superblock | |
183 | * @s: superblock | |
184 | * | |
185 | */ | |
186 | ||
187 | static void v9fs_kill_super(struct super_block *s) | |
188 | { | |
189 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
190 | ||
5d385153 | 191 | p9_debug(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 192 | |
9e82cf6a | 193 | kill_anon_super(s); |
df5d8c80 | 194 | |
6d96d3ab | 195 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
196 | v9fs_session_close(v9ses); |
197 | kfree(v9ses); | |
1b5ab3e8 | 198 | s->s_fs_info = NULL; |
5d385153 | 199 | p9_debug(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
200 | } |
201 | ||
322b329a | 202 | static void |
42faad99 | 203 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 204 | { |
67e55205 | 205 | struct v9fs_session_info *v9ses; |
322b329a | 206 | |
67e55205 | 207 | v9ses = sb->s_fs_info; |
6d96d3ab | 208 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
209 | } |
210 | ||
bda8e775 SK |
211 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
212 | { | |
213 | struct v9fs_session_info *v9ses; | |
214 | struct p9_fid *fid; | |
215 | struct p9_rstatfs rs; | |
216 | int res; | |
217 | ||
218 | fid = v9fs_fid_lookup(dentry); | |
219 | if (IS_ERR(fid)) { | |
220 | res = PTR_ERR(fid); | |
221 | goto done; | |
222 | } | |
223 | ||
42869c8a | 224 | v9ses = v9fs_dentry2v9ses(dentry); |
bda8e775 SK |
225 | if (v9fs_proto_dotl(v9ses)) { |
226 | res = p9_client_statfs(fid, &rs); | |
227 | if (res == 0) { | |
5bdad933 | 228 | buf->f_type = rs.type; |
bda8e775 SK |
229 | buf->f_bsize = rs.bsize; |
230 | buf->f_blocks = rs.blocks; | |
231 | buf->f_bfree = rs.bfree; | |
232 | buf->f_bavail = rs.bavail; | |
233 | buf->f_files = rs.files; | |
234 | buf->f_ffree = rs.ffree; | |
6d1349c7 | 235 | buf->f_fsid = u64_to_fsid(rs.fsid); |
bda8e775 SK |
236 | buf->f_namelen = rs.namelen; |
237 | } | |
238 | if (res != -ENOSYS) | |
239 | goto done; | |
240 | } | |
241 | res = simple_statfs(dentry, buf); | |
242 | done: | |
b48dbb99 | 243 | p9_fid_put(fid); |
bda8e775 SK |
244 | return res; |
245 | } | |
246 | ||
824f06ff EVH |
247 | static int v9fs_drop_inode(struct inode *inode) |
248 | { | |
249 | struct v9fs_session_info *v9ses; | |
250 | ||
251 | v9ses = v9fs_inode2v9ses(inode); | |
252 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) | |
253 | return generic_drop_inode(inode); | |
254 | /* | |
255 | * in case of non cached mode always drop the | |
256 | * inode because we want the inode attribute | |
257 | * to always match that on the server. | |
258 | */ | |
259 | return 1; | |
260 | } | |
261 | ||
c2ed3880 AK |
262 | static int v9fs_write_inode(struct inode *inode, |
263 | struct writeback_control *wbc) | |
264 | { | |
c2ed3880 AK |
265 | /* |
266 | * send an fsync request to server irrespective of | |
267 | * wbc->sync_mode. | |
268 | */ | |
5d385153 | 269 | p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode); |
c9c4ff12 | 270 | return netfs_unpin_writeback(inode, wbc); |
c2ed3880 AK |
271 | } |
272 | ||
273 | static int v9fs_write_inode_dotl(struct inode *inode, | |
274 | struct writeback_control *wbc) | |
275 | { | |
1543b4c5 | 276 | |
1543b4c5 EVH |
277 | p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode); |
278 | ||
c9c4ff12 | 279 | return netfs_unpin_writeback(inode, wbc); |
c2ed3880 AK |
280 | } |
281 | ||
ee9b6d61 | 282 | static const struct super_operations v9fs_super_ops = { |
60e78d2c | 283 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 284 | .free_inode = v9fs_free_inode, |
9e82cf6a | 285 | .statfs = simple_statfs, |
b57922d9 | 286 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 287 | .show_options = v9fs_show_options, |
322b329a | 288 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 289 | .write_inode = v9fs_write_inode, |
9e82cf6a EVH |
290 | }; |
291 | ||
9b6533c9 | 292 | static const struct super_operations v9fs_super_ops_dotl = { |
9b6533c9 | 293 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 294 | .free_inode = v9fs_free_inode, |
bda8e775 | 295 | .statfs = v9fs_statfs, |
824f06ff | 296 | .drop_inode = v9fs_drop_inode, |
b57922d9 | 297 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 298 | .show_options = v9fs_show_options, |
9b6533c9 | 299 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 300 | .write_inode = v9fs_write_inode_dotl, |
9b6533c9 SK |
301 | }; |
302 | ||
9e82cf6a | 303 | struct file_system_type v9fs_fs_type = { |
67543e50 | 304 | .name = "9p", |
d2d1ea93 | 305 | .mount = v9fs_mount, |
9e82cf6a EVH |
306 | .kill_sb = v9fs_kill_super, |
307 | .owner = THIS_MODULE, | |
ecf3d1f1 | 308 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 309 | }; |
7f78e035 | 310 | MODULE_ALIAS_FS("9p"); |