Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 4 | |
| 5 | This program can be distributed under the terms of the GNU GPL. |
| 6 | See the file COPYING. |
| 7 | */ |
| 8 | |
| 9 | #include "fuse_i.h" |
| 10 | |
| 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/file.h> |
| 13 | #include <linux/gfp.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/namei.h> |
| 16 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 17 | /* |
| 18 | * FUSE caches dentries and attributes with separate timeout. The |
| 19 | * time in jiffies until the dentry/attributes are valid is stored in |
| 20 | * dentry->d_time and fuse_inode->i_time respectively. |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * Calculate the time in jiffies until a dentry/attributes are valid |
| 25 | */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 26 | static unsigned long time_to_jiffies(unsigned long sec, unsigned long nsec) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 27 | { |
| 28 | struct timespec ts = {sec, nsec}; |
| 29 | return jiffies + timespec_to_jiffies(&ts); |
| 30 | } |
| 31 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 32 | /* |
| 33 | * Set dentry and possibly attribute timeouts from the lookup/mk* |
| 34 | * replies |
| 35 | */ |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 36 | static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o) |
| 37 | { |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 38 | entry->d_time = time_to_jiffies(o->entry_valid, o->entry_valid_nsec); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 39 | if (entry->d_inode) |
| 40 | get_fuse_inode(entry->d_inode)->i_time = |
| 41 | time_to_jiffies(o->attr_valid, o->attr_valid_nsec); |
| 42 | } |
| 43 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 44 | /* |
| 45 | * Mark the attributes as stale, so that at the next call to |
| 46 | * ->getattr() they will be fetched from userspace |
| 47 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 48 | void fuse_invalidate_attr(struct inode *inode) |
| 49 | { |
| 50 | get_fuse_inode(inode)->i_time = jiffies - 1; |
| 51 | } |
| 52 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 53 | /* |
| 54 | * Just mark the entry as stale, so that a next attempt to look it up |
| 55 | * will result in a new lookup call to userspace |
| 56 | * |
| 57 | * This is called when a dentry is about to become negative and the |
| 58 | * timeout is unknown (unlink, rmdir, rename and in some cases |
| 59 | * lookup) |
| 60 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 61 | static void fuse_invalidate_entry_cache(struct dentry *entry) |
| 62 | { |
| 63 | entry->d_time = jiffies - 1; |
| 64 | } |
| 65 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 66 | /* |
| 67 | * Same as fuse_invalidate_entry_cache(), but also try to remove the |
| 68 | * dentry from the hash |
| 69 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 70 | static void fuse_invalidate_entry(struct dentry *entry) |
| 71 | { |
| 72 | d_invalidate(entry); |
| 73 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 74 | } |
| 75 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 76 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, |
| 77 | struct dentry *entry, |
| 78 | struct fuse_entry_out *outarg) |
| 79 | { |
| 80 | req->in.h.opcode = FUSE_LOOKUP; |
| 81 | req->in.h.nodeid = get_node_id(dir); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 82 | req->in.numargs = 1; |
| 83 | req->in.args[0].size = entry->d_name.len + 1; |
| 84 | req->in.args[0].value = entry->d_name.name; |
| 85 | req->out.numargs = 1; |
| 86 | req->out.args[0].size = sizeof(struct fuse_entry_out); |
| 87 | req->out.args[0].value = outarg; |
| 88 | } |
| 89 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 90 | /* |
| 91 | * Check whether the dentry is still valid |
| 92 | * |
| 93 | * If the entry validity timeout has expired and the dentry is |
| 94 | * positive, try to redo the lookup. If the lookup results in a |
| 95 | * different inode, then let the VFS invalidate the dentry and redo |
| 96 | * the lookup once more. If the lookup results in the same inode, |
| 97 | * then refresh the attributes, timeouts and mark the dentry valid. |
| 98 | */ |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 99 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
| 100 | { |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 101 | struct inode *inode = entry->d_inode; |
| 102 | |
| 103 | if (inode && is_bad_inode(inode)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 104 | return 0; |
| 105 | else if (time_after(jiffies, entry->d_time)) { |
| 106 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 107 | struct fuse_entry_out outarg; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 108 | struct fuse_conn *fc; |
| 109 | struct fuse_req *req; |
| 110 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 111 | /* Doesn't hurt to "reset" the validity timeout */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 112 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 113 | |
| 114 | /* For negative dentries, always do a fresh lookup */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 115 | if (!inode) |
| 116 | return 0; |
| 117 | |
| 118 | fc = get_fuse_conn(inode); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 119 | req = fuse_get_req(fc); |
| 120 | if (IS_ERR(req)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 121 | return 0; |
| 122 | |
| 123 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 124 | request_send(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 125 | err = req->out.h.error; |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 126 | /* Zero nodeid is same as -ENOENT */ |
| 127 | if (!err && !outarg.nodeid) |
| 128 | err = -ENOENT; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 129 | if (!err) { |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 131 | if (outarg.nodeid != get_node_id(inode)) { |
| 132 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
| 133 | return 0; |
| 134 | } |
| 135 | fi->nlookup ++; |
| 136 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 137 | fuse_put_request(fc, req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 138 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 139 | return 0; |
| 140 | |
| 141 | fuse_change_attributes(inode, &outarg.attr); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 142 | fuse_change_timeout(entry, &outarg); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 143 | } |
| 144 | return 1; |
| 145 | } |
| 146 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 147 | /* |
| 148 | * Check if there's already a hashed alias of this directory inode. |
| 149 | * If yes, then lookup and mkdir must not create a new alias. |
| 150 | */ |
Miklos Szeredi | f007d5c | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 151 | static int dir_alias(struct inode *inode) |
| 152 | { |
| 153 | if (S_ISDIR(inode->i_mode)) { |
Miklos Szeredi | f007d5c | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 154 | struct dentry *alias = d_find_alias(inode); |
| 155 | if (alias) { |
| 156 | dput(alias); |
| 157 | return 1; |
| 158 | } |
| 159 | } |
| 160 | return 0; |
| 161 | } |
| 162 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 163 | static int invalid_nodeid(u64 nodeid) |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 164 | { |
| 165 | return !nodeid || nodeid == FUSE_ROOT_ID; |
| 166 | } |
| 167 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 168 | static struct dentry_operations fuse_dentry_operations = { |
| 169 | .d_revalidate = fuse_dentry_revalidate, |
| 170 | }; |
| 171 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 172 | static int valid_mode(int m) |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 173 | { |
| 174 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || |
| 175 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); |
| 176 | } |
| 177 | |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 178 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
| 179 | struct nameidata *nd) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 180 | { |
| 181 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 182 | struct fuse_entry_out outarg; |
| 183 | struct inode *inode = NULL; |
| 184 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 185 | struct fuse_req *req; |
| 186 | |
| 187 | if (entry->d_name.len > FUSE_NAME_MAX) |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 188 | return ERR_PTR(-ENAMETOOLONG); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 189 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 190 | req = fuse_get_req(fc); |
| 191 | if (IS_ERR(req)) |
| 192 | return ERR_PTR(PTR_ERR(req)); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 193 | |
| 194 | fuse_lookup_init(req, dir, entry, &outarg); |
| 195 | request_send(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 196 | err = req->out.h.error; |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 197 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
| 198 | if (!err && outarg.nodeid && |
| 199 | (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode))) |
Miklos Szeredi | ee4e527 | 2005-09-27 21:45:21 -0700 | [diff] [blame] | 200 | err = -EIO; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 201 | if (!err && outarg.nodeid) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 202 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 203 | &outarg.attr); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 204 | if (!inode) { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 205 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 206 | return ERR_PTR(-ENOMEM); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 207 | } |
| 208 | } |
| 209 | fuse_put_request(fc, req); |
| 210 | if (err && err != -ENOENT) |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 211 | return ERR_PTR(err); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 212 | |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 213 | if (inode && dir_alias(inode)) { |
| 214 | iput(inode); |
| 215 | return ERR_PTR(-EIO); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 216 | } |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 217 | d_add(entry, inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 218 | entry->d_op = &fuse_dentry_operations; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 219 | if (!err) |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 220 | fuse_change_timeout(entry, &outarg); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 221 | else |
| 222 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 223 | return NULL; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 226 | /* |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 227 | * Synchronous release for the case when something goes wrong in CREATE_OPEN |
| 228 | */ |
| 229 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, |
| 230 | u64 nodeid, int flags) |
| 231 | { |
| 232 | struct fuse_req *req; |
| 233 | |
| 234 | req = fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); |
| 235 | req->force = 1; |
| 236 | request_send(fc, req); |
| 237 | fuse_put_request(fc, req); |
| 238 | } |
| 239 | |
| 240 | /* |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 241 | * Atomic create+open operation |
| 242 | * |
| 243 | * If the filesystem doesn't support this, then fall back to separate |
| 244 | * 'mknod' + 'open' requests. |
| 245 | */ |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 246 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
| 247 | struct nameidata *nd) |
| 248 | { |
| 249 | int err; |
| 250 | struct inode *inode; |
| 251 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 252 | struct fuse_req *req; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 253 | struct fuse_req *forget_req; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 254 | struct fuse_open_in inarg; |
| 255 | struct fuse_open_out outopen; |
| 256 | struct fuse_entry_out outentry; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 257 | struct fuse_file *ff; |
| 258 | struct file *file; |
| 259 | int flags = nd->intent.open.flags - 1; |
| 260 | |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 261 | if (fc->no_create) |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 262 | return -ENOSYS; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 263 | |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 264 | forget_req = fuse_get_req(fc); |
| 265 | if (IS_ERR(forget_req)) |
| 266 | return PTR_ERR(forget_req); |
| 267 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 268 | req = fuse_get_req(fc); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 269 | err = PTR_ERR(req); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 270 | if (IS_ERR(req)) |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 271 | goto out_put_forget_req; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 272 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 273 | err = -ENOMEM; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 274 | ff = fuse_file_alloc(); |
| 275 | if (!ff) |
| 276 | goto out_put_request; |
| 277 | |
| 278 | flags &= ~O_NOCTTY; |
| 279 | memset(&inarg, 0, sizeof(inarg)); |
| 280 | inarg.flags = flags; |
| 281 | inarg.mode = mode; |
| 282 | req->in.h.opcode = FUSE_CREATE; |
| 283 | req->in.h.nodeid = get_node_id(dir); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 284 | req->in.numargs = 2; |
| 285 | req->in.args[0].size = sizeof(inarg); |
| 286 | req->in.args[0].value = &inarg; |
| 287 | req->in.args[1].size = entry->d_name.len + 1; |
| 288 | req->in.args[1].value = entry->d_name.name; |
| 289 | req->out.numargs = 2; |
| 290 | req->out.args[0].size = sizeof(outentry); |
| 291 | req->out.args[0].value = &outentry; |
| 292 | req->out.args[1].size = sizeof(outopen); |
| 293 | req->out.args[1].value = &outopen; |
| 294 | request_send(fc, req); |
| 295 | err = req->out.h.error; |
| 296 | if (err) { |
| 297 | if (err == -ENOSYS) |
| 298 | fc->no_create = 1; |
| 299 | goto out_free_ff; |
| 300 | } |
| 301 | |
| 302 | err = -EIO; |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 303 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 304 | goto out_free_ff; |
| 305 | |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 306 | fuse_put_request(fc, req); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 307 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
| 308 | &outentry.attr); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 309 | if (!inode) { |
| 310 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); |
| 311 | ff->fh = outopen.fh; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 312 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
| 313 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); |
| 314 | return -ENOMEM; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 315 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 316 | fuse_put_request(fc, forget_req); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 317 | d_instantiate(entry, inode); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 318 | fuse_change_timeout(entry, &outentry); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 319 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
| 320 | if (IS_ERR(file)) { |
| 321 | ff->fh = outopen.fh; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 322 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 323 | return PTR_ERR(file); |
| 324 | } |
| 325 | fuse_finish_open(inode, file, ff, &outopen); |
| 326 | return 0; |
| 327 | |
| 328 | out_free_ff: |
| 329 | fuse_file_free(ff); |
| 330 | out_put_request: |
| 331 | fuse_put_request(fc, req); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 332 | out_put_forget_req: |
| 333 | fuse_put_request(fc, forget_req); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 334 | return err; |
| 335 | } |
| 336 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 337 | /* |
| 338 | * Code shared between mknod, mkdir, symlink and link |
| 339 | */ |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 340 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
| 341 | struct inode *dir, struct dentry *entry, |
| 342 | int mode) |
| 343 | { |
| 344 | struct fuse_entry_out outarg; |
| 345 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 346 | int err; |
| 347 | |
| 348 | req->in.h.nodeid = get_node_id(dir); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 349 | req->out.numargs = 1; |
| 350 | req->out.args[0].size = sizeof(outarg); |
| 351 | req->out.args[0].value = &outarg; |
| 352 | request_send(fc, req); |
| 353 | err = req->out.h.error; |
| 354 | if (err) { |
| 355 | fuse_put_request(fc, req); |
| 356 | return err; |
| 357 | } |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 358 | err = -EIO; |
| 359 | if (invalid_nodeid(outarg.nodeid)) |
| 360 | goto out_put_request; |
| 361 | |
| 362 | if ((outarg.attr.mode ^ mode) & S_IFMT) |
| 363 | goto out_put_request; |
| 364 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 365 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
| 366 | &outarg.attr); |
| 367 | if (!inode) { |
| 368 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
| 369 | return -ENOMEM; |
| 370 | } |
| 371 | fuse_put_request(fc, req); |
| 372 | |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 373 | if (dir_alias(inode)) { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 374 | iput(inode); |
| 375 | return -EIO; |
| 376 | } |
| 377 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 378 | d_instantiate(entry, inode); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 379 | fuse_change_timeout(entry, &outarg); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 380 | fuse_invalidate_attr(dir); |
| 381 | return 0; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 382 | |
| 383 | out_put_request: |
| 384 | fuse_put_request(fc, req); |
| 385 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, |
| 389 | dev_t rdev) |
| 390 | { |
| 391 | struct fuse_mknod_in inarg; |
| 392 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 393 | struct fuse_req *req = fuse_get_req(fc); |
| 394 | if (IS_ERR(req)) |
| 395 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 396 | |
| 397 | memset(&inarg, 0, sizeof(inarg)); |
| 398 | inarg.mode = mode; |
| 399 | inarg.rdev = new_encode_dev(rdev); |
| 400 | req->in.h.opcode = FUSE_MKNOD; |
| 401 | req->in.numargs = 2; |
| 402 | req->in.args[0].size = sizeof(inarg); |
| 403 | req->in.args[0].value = &inarg; |
| 404 | req->in.args[1].size = entry->d_name.len + 1; |
| 405 | req->in.args[1].value = entry->d_name.name; |
| 406 | return create_new_entry(fc, req, dir, entry, mode); |
| 407 | } |
| 408 | |
| 409 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, |
| 410 | struct nameidata *nd) |
| 411 | { |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 412 | if (nd && (nd->flags & LOOKUP_CREATE)) { |
| 413 | int err = fuse_create_open(dir, entry, mode, nd); |
| 414 | if (err != -ENOSYS) |
| 415 | return err; |
| 416 | /* Fall back on mknod */ |
| 417 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 418 | return fuse_mknod(dir, entry, mode, 0); |
| 419 | } |
| 420 | |
| 421 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) |
| 422 | { |
| 423 | struct fuse_mkdir_in inarg; |
| 424 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 425 | struct fuse_req *req = fuse_get_req(fc); |
| 426 | if (IS_ERR(req)) |
| 427 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 428 | |
| 429 | memset(&inarg, 0, sizeof(inarg)); |
| 430 | inarg.mode = mode; |
| 431 | req->in.h.opcode = FUSE_MKDIR; |
| 432 | req->in.numargs = 2; |
| 433 | req->in.args[0].size = sizeof(inarg); |
| 434 | req->in.args[0].value = &inarg; |
| 435 | req->in.args[1].size = entry->d_name.len + 1; |
| 436 | req->in.args[1].value = entry->d_name.name; |
| 437 | return create_new_entry(fc, req, dir, entry, S_IFDIR); |
| 438 | } |
| 439 | |
| 440 | static int fuse_symlink(struct inode *dir, struct dentry *entry, |
| 441 | const char *link) |
| 442 | { |
| 443 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 444 | unsigned len = strlen(link) + 1; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 445 | struct fuse_req *req = fuse_get_req(fc); |
| 446 | if (IS_ERR(req)) |
| 447 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 448 | |
| 449 | req->in.h.opcode = FUSE_SYMLINK; |
| 450 | req->in.numargs = 2; |
| 451 | req->in.args[0].size = entry->d_name.len + 1; |
| 452 | req->in.args[0].value = entry->d_name.name; |
| 453 | req->in.args[1].size = len; |
| 454 | req->in.args[1].value = link; |
| 455 | return create_new_entry(fc, req, dir, entry, S_IFLNK); |
| 456 | } |
| 457 | |
| 458 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
| 459 | { |
| 460 | int err; |
| 461 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 462 | struct fuse_req *req = fuse_get_req(fc); |
| 463 | if (IS_ERR(req)) |
| 464 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 465 | |
| 466 | req->in.h.opcode = FUSE_UNLINK; |
| 467 | req->in.h.nodeid = get_node_id(dir); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 468 | req->in.numargs = 1; |
| 469 | req->in.args[0].size = entry->d_name.len + 1; |
| 470 | req->in.args[0].value = entry->d_name.name; |
| 471 | request_send(fc, req); |
| 472 | err = req->out.h.error; |
| 473 | fuse_put_request(fc, req); |
| 474 | if (!err) { |
| 475 | struct inode *inode = entry->d_inode; |
| 476 | |
| 477 | /* Set nlink to zero so the inode can be cleared, if |
| 478 | the inode does have more links this will be |
| 479 | discovered at the next lookup/getattr */ |
| 480 | inode->i_nlink = 0; |
| 481 | fuse_invalidate_attr(inode); |
| 482 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 483 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 484 | } else if (err == -EINTR) |
| 485 | fuse_invalidate_entry(entry); |
| 486 | return err; |
| 487 | } |
| 488 | |
| 489 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) |
| 490 | { |
| 491 | int err; |
| 492 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 493 | struct fuse_req *req = fuse_get_req(fc); |
| 494 | if (IS_ERR(req)) |
| 495 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 496 | |
| 497 | req->in.h.opcode = FUSE_RMDIR; |
| 498 | req->in.h.nodeid = get_node_id(dir); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 499 | req->in.numargs = 1; |
| 500 | req->in.args[0].size = entry->d_name.len + 1; |
| 501 | req->in.args[0].value = entry->d_name.name; |
| 502 | request_send(fc, req); |
| 503 | err = req->out.h.error; |
| 504 | fuse_put_request(fc, req); |
| 505 | if (!err) { |
| 506 | entry->d_inode->i_nlink = 0; |
| 507 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 508 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 509 | } else if (err == -EINTR) |
| 510 | fuse_invalidate_entry(entry); |
| 511 | return err; |
| 512 | } |
| 513 | |
| 514 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, |
| 515 | struct inode *newdir, struct dentry *newent) |
| 516 | { |
| 517 | int err; |
| 518 | struct fuse_rename_in inarg; |
| 519 | struct fuse_conn *fc = get_fuse_conn(olddir); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 520 | struct fuse_req *req = fuse_get_req(fc); |
| 521 | if (IS_ERR(req)) |
| 522 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 523 | |
| 524 | memset(&inarg, 0, sizeof(inarg)); |
| 525 | inarg.newdir = get_node_id(newdir); |
| 526 | req->in.h.opcode = FUSE_RENAME; |
| 527 | req->in.h.nodeid = get_node_id(olddir); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 528 | req->in.numargs = 3; |
| 529 | req->in.args[0].size = sizeof(inarg); |
| 530 | req->in.args[0].value = &inarg; |
| 531 | req->in.args[1].size = oldent->d_name.len + 1; |
| 532 | req->in.args[1].value = oldent->d_name.name; |
| 533 | req->in.args[2].size = newent->d_name.len + 1; |
| 534 | req->in.args[2].value = newent->d_name.name; |
| 535 | request_send(fc, req); |
| 536 | err = req->out.h.error; |
| 537 | fuse_put_request(fc, req); |
| 538 | if (!err) { |
| 539 | fuse_invalidate_attr(olddir); |
| 540 | if (olddir != newdir) |
| 541 | fuse_invalidate_attr(newdir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 542 | |
| 543 | /* newent will end up negative */ |
| 544 | if (newent->d_inode) |
| 545 | fuse_invalidate_entry_cache(newent); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 546 | } else if (err == -EINTR) { |
| 547 | /* If request was interrupted, DEITY only knows if the |
| 548 | rename actually took place. If the invalidation |
| 549 | fails (e.g. some process has CWD under the renamed |
| 550 | directory), then there can be inconsistency between |
| 551 | the dcache and the real filesystem. Tough luck. */ |
| 552 | fuse_invalidate_entry(oldent); |
| 553 | if (newent->d_inode) |
| 554 | fuse_invalidate_entry(newent); |
| 555 | } |
| 556 | |
| 557 | return err; |
| 558 | } |
| 559 | |
| 560 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
| 561 | struct dentry *newent) |
| 562 | { |
| 563 | int err; |
| 564 | struct fuse_link_in inarg; |
| 565 | struct inode *inode = entry->d_inode; |
| 566 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 567 | struct fuse_req *req = fuse_get_req(fc); |
| 568 | if (IS_ERR(req)) |
| 569 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 570 | |
| 571 | memset(&inarg, 0, sizeof(inarg)); |
| 572 | inarg.oldnodeid = get_node_id(inode); |
| 573 | req->in.h.opcode = FUSE_LINK; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 574 | req->in.numargs = 2; |
| 575 | req->in.args[0].size = sizeof(inarg); |
| 576 | req->in.args[0].value = &inarg; |
| 577 | req->in.args[1].size = newent->d_name.len + 1; |
| 578 | req->in.args[1].value = newent->d_name.name; |
| 579 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); |
| 580 | /* Contrary to "normal" filesystems it can happen that link |
| 581 | makes two "logical" inodes point to the same "physical" |
| 582 | inode. We invalidate the attributes of the old one, so it |
| 583 | will reflect changes in the backing inode (link count, |
| 584 | etc.) |
| 585 | */ |
| 586 | if (!err || err == -EINTR) |
| 587 | fuse_invalidate_attr(inode); |
| 588 | return err; |
| 589 | } |
| 590 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 591 | int fuse_do_getattr(struct inode *inode) |
| 592 | { |
| 593 | int err; |
| 594 | struct fuse_attr_out arg; |
| 595 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 596 | struct fuse_req *req = fuse_get_req(fc); |
| 597 | if (IS_ERR(req)) |
| 598 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 599 | |
| 600 | req->in.h.opcode = FUSE_GETATTR; |
| 601 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 602 | req->out.numargs = 1; |
| 603 | req->out.args[0].size = sizeof(arg); |
| 604 | req->out.args[0].value = &arg; |
| 605 | request_send(fc, req); |
| 606 | err = req->out.h.error; |
| 607 | fuse_put_request(fc, req); |
| 608 | if (!err) { |
| 609 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { |
| 610 | make_bad_inode(inode); |
| 611 | err = -EIO; |
| 612 | } else { |
| 613 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 614 | fuse_change_attributes(inode, &arg.attr); |
| 615 | fi->i_time = time_to_jiffies(arg.attr_valid, |
| 616 | arg.attr_valid_nsec); |
| 617 | } |
| 618 | } |
| 619 | return err; |
| 620 | } |
| 621 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 622 | /* |
| 623 | * Calling into a user-controlled filesystem gives the filesystem |
| 624 | * daemon ptrace-like capabilities over the requester process. This |
| 625 | * means, that the filesystem daemon is able to record the exact |
| 626 | * filesystem operations performed, and can also control the behavior |
| 627 | * of the requester process in otherwise impossible ways. For example |
| 628 | * it can delay the operation for arbitrary length of time allowing |
| 629 | * DoS against the requester. |
| 630 | * |
| 631 | * For this reason only those processes can call into the filesystem, |
| 632 | * for which the owner of the mount has ptrace privilege. This |
| 633 | * excludes processes started by other users, suid or sgid processes. |
| 634 | */ |
| 635 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
| 636 | { |
| 637 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 638 | return 1; |
| 639 | |
| 640 | if (task->euid == fc->user_id && |
| 641 | task->suid == fc->user_id && |
| 642 | task->uid == fc->user_id && |
| 643 | task->egid == fc->group_id && |
| 644 | task->sgid == fc->group_id && |
| 645 | task->gid == fc->group_id) |
| 646 | return 1; |
| 647 | |
| 648 | return 0; |
| 649 | } |
| 650 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 651 | /* |
| 652 | * Check whether the inode attributes are still valid |
| 653 | * |
| 654 | * If the attribute validity timeout has expired, then fetch the fresh |
| 655 | * attributes with a 'getattr' request |
| 656 | * |
| 657 | * I'm not sure why cached attributes are never returned for the root |
| 658 | * inode, this is probably being too cautious. |
| 659 | */ |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 660 | static int fuse_revalidate(struct dentry *entry) |
| 661 | { |
| 662 | struct inode *inode = entry->d_inode; |
| 663 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 664 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 665 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 666 | if (!fuse_allow_task(fc, current)) |
| 667 | return -EACCES; |
| 668 | if (get_node_id(inode) != FUSE_ROOT_ID && |
| 669 | time_before_eq(jiffies, fi->i_time)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 670 | return 0; |
| 671 | |
| 672 | return fuse_do_getattr(inode); |
| 673 | } |
| 674 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 675 | static int fuse_access(struct inode *inode, int mask) |
| 676 | { |
| 677 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 678 | struct fuse_req *req; |
| 679 | struct fuse_access_in inarg; |
| 680 | int err; |
| 681 | |
| 682 | if (fc->no_access) |
| 683 | return 0; |
| 684 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 685 | req = fuse_get_req(fc); |
| 686 | if (IS_ERR(req)) |
| 687 | return PTR_ERR(req); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 688 | |
| 689 | memset(&inarg, 0, sizeof(inarg)); |
| 690 | inarg.mask = mask; |
| 691 | req->in.h.opcode = FUSE_ACCESS; |
| 692 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 693 | req->in.numargs = 1; |
| 694 | req->in.args[0].size = sizeof(inarg); |
| 695 | req->in.args[0].value = &inarg; |
| 696 | request_send(fc, req); |
| 697 | err = req->out.h.error; |
| 698 | fuse_put_request(fc, req); |
| 699 | if (err == -ENOSYS) { |
| 700 | fc->no_access = 1; |
| 701 | err = 0; |
| 702 | } |
| 703 | return err; |
| 704 | } |
| 705 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 706 | /* |
| 707 | * Check permission. The two basic access models of FUSE are: |
| 708 | * |
| 709 | * 1) Local access checking ('default_permissions' mount option) based |
| 710 | * on file mode. This is the plain old disk filesystem permission |
| 711 | * modell. |
| 712 | * |
| 713 | * 2) "Remote" access checking, where server is responsible for |
| 714 | * checking permission in each inode operation. An exception to this |
| 715 | * is if ->permission() was invoked from sys_access() in which case an |
| 716 | * access request is sent. Execute permission is still checked |
| 717 | * locally based on file mode. |
| 718 | */ |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 719 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 720 | { |
| 721 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 722 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 723 | if (!fuse_allow_task(fc, current)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 724 | return -EACCES; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 725 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
| 726 | int err = generic_permission(inode, mask, NULL); |
| 727 | |
| 728 | /* If permission is denied, try to refresh file |
| 729 | attributes. This is also needed, because the root |
| 730 | node will at first have no permissions */ |
| 731 | if (err == -EACCES) { |
| 732 | err = fuse_do_getattr(inode); |
| 733 | if (!err) |
| 734 | err = generic_permission(inode, mask, NULL); |
| 735 | } |
| 736 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 737 | /* Note: the opposite of the above test does not |
| 738 | exist. So if permissions are revoked this won't be |
| 739 | noticed immediately, only after the attribute |
| 740 | timeout has expired */ |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 741 | |
| 742 | return err; |
| 743 | } else { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 744 | int mode = inode->i_mode; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 745 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
| 746 | return -EACCES; |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 747 | |
| 748 | if (nd && (nd->flags & LOOKUP_ACCESS)) |
| 749 | return fuse_access(inode, mask); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 750 | return 0; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, |
| 755 | void *dstbuf, filldir_t filldir) |
| 756 | { |
| 757 | while (nbytes >= FUSE_NAME_OFFSET) { |
| 758 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; |
| 759 | size_t reclen = FUSE_DIRENT_SIZE(dirent); |
| 760 | int over; |
| 761 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 762 | return -EIO; |
| 763 | if (reclen > nbytes) |
| 764 | break; |
| 765 | |
| 766 | over = filldir(dstbuf, dirent->name, dirent->namelen, |
| 767 | file->f_pos, dirent->ino, dirent->type); |
| 768 | if (over) |
| 769 | break; |
| 770 | |
| 771 | buf += reclen; |
| 772 | nbytes -= reclen; |
| 773 | file->f_pos = dirent->off; |
| 774 | } |
| 775 | |
| 776 | return 0; |
| 777 | } |
| 778 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 779 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
| 780 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 781 | int err; |
| 782 | size_t nbytes; |
| 783 | struct page *page; |
| 784 | struct inode *inode = file->f_dentry->d_inode; |
| 785 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 248d86e | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 786 | struct fuse_req *req; |
| 787 | |
| 788 | if (is_bad_inode(inode)) |
| 789 | return -EIO; |
| 790 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 791 | req = fuse_get_req(fc); |
| 792 | if (IS_ERR(req)) |
| 793 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 794 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 795 | page = alloc_page(GFP_KERNEL); |
| 796 | if (!page) { |
| 797 | fuse_put_request(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 798 | return -ENOMEM; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 799 | } |
| 800 | req->num_pages = 1; |
| 801 | req->pages[0] = page; |
Miklos Szeredi | 361b1eb | 2006-01-16 22:14:45 -0800 | [diff] [blame] | 802 | fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
| 803 | request_send(fc, req); |
| 804 | nbytes = req->out.args[0].size; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 805 | err = req->out.h.error; |
| 806 | fuse_put_request(fc, req); |
| 807 | if (!err) |
| 808 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
| 809 | filldir); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 810 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 811 | __free_page(page); |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 812 | fuse_invalidate_attr(inode); /* atime changed */ |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 813 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | static char *read_link(struct dentry *dentry) |
| 817 | { |
| 818 | struct inode *inode = dentry->d_inode; |
| 819 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 820 | struct fuse_req *req = fuse_get_req(fc); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 821 | char *link; |
| 822 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 823 | if (IS_ERR(req)) |
| 824 | return ERR_PTR(PTR_ERR(req)); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 825 | |
| 826 | link = (char *) __get_free_page(GFP_KERNEL); |
| 827 | if (!link) { |
| 828 | link = ERR_PTR(-ENOMEM); |
| 829 | goto out; |
| 830 | } |
| 831 | req->in.h.opcode = FUSE_READLINK; |
| 832 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 833 | req->out.argvar = 1; |
| 834 | req->out.numargs = 1; |
| 835 | req->out.args[0].size = PAGE_SIZE - 1; |
| 836 | req->out.args[0].value = link; |
| 837 | request_send(fc, req); |
| 838 | if (req->out.h.error) { |
| 839 | free_page((unsigned long) link); |
| 840 | link = ERR_PTR(req->out.h.error); |
| 841 | } else |
| 842 | link[req->out.args[0].size] = '\0'; |
| 843 | out: |
| 844 | fuse_put_request(fc, req); |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 845 | fuse_invalidate_attr(inode); /* atime changed */ |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 846 | return link; |
| 847 | } |
| 848 | |
| 849 | static void free_link(char *link) |
| 850 | { |
| 851 | if (!IS_ERR(link)) |
| 852 | free_page((unsigned long) link); |
| 853 | } |
| 854 | |
| 855 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 856 | { |
| 857 | nd_set_link(nd, read_link(dentry)); |
| 858 | return NULL; |
| 859 | } |
| 860 | |
| 861 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) |
| 862 | { |
| 863 | free_link(nd_get_link(nd)); |
| 864 | } |
| 865 | |
| 866 | static int fuse_dir_open(struct inode *inode, struct file *file) |
| 867 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 868 | return fuse_open_common(inode, file, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | static int fuse_dir_release(struct inode *inode, struct file *file) |
| 872 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 873 | return fuse_release_common(inode, file, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 874 | } |
| 875 | |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 876 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
| 877 | { |
| 878 | /* nfsd can call this with no file */ |
| 879 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; |
| 880 | } |
| 881 | |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 882 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 883 | { |
| 884 | unsigned ivalid = iattr->ia_valid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 885 | |
| 886 | if (ivalid & ATTR_MODE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 887 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 888 | if (ivalid & ATTR_UID) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 889 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 890 | if (ivalid & ATTR_GID) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 891 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 892 | if (ivalid & ATTR_SIZE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 893 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 894 | /* You can only _set_ these together (they may change by themselves) */ |
| 895 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 896 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
| 897 | arg->atime = iattr->ia_atime.tv_sec; |
| 898 | arg->mtime = iattr->ia_mtime.tv_sec; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 899 | } |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 900 | if (ivalid & ATTR_FILE) { |
| 901 | struct fuse_file *ff = iattr->ia_file->private_data; |
| 902 | arg->valid |= FATTR_FH; |
| 903 | arg->fh = ff->fh; |
| 904 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 905 | } |
| 906 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 907 | /* |
| 908 | * Set attributes, and at the same time refresh them. |
| 909 | * |
| 910 | * Truncation is slightly complicated, because the 'truncate' request |
| 911 | * may fail, in which case we don't want to touch the mapping. |
| 912 | * vmtruncate() doesn't allow for this case. So do the rlimit |
| 913 | * checking by hand and call vmtruncate() only after the file has |
| 914 | * actually been truncated. |
| 915 | */ |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 916 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
| 917 | { |
| 918 | struct inode *inode = entry->d_inode; |
| 919 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 920 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 921 | struct fuse_req *req; |
| 922 | struct fuse_setattr_in inarg; |
| 923 | struct fuse_attr_out outarg; |
| 924 | int err; |
| 925 | int is_truncate = 0; |
| 926 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 927 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
| 928 | err = inode_change_ok(inode, attr); |
| 929 | if (err) |
| 930 | return err; |
| 931 | } |
| 932 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 933 | if (attr->ia_valid & ATTR_SIZE) { |
| 934 | unsigned long limit; |
| 935 | is_truncate = 1; |
| 936 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
| 937 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { |
| 938 | send_sig(SIGXFSZ, current, 0); |
| 939 | return -EFBIG; |
| 940 | } |
| 941 | } |
| 942 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 943 | req = fuse_get_req(fc); |
| 944 | if (IS_ERR(req)) |
| 945 | return PTR_ERR(req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 946 | |
| 947 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 948 | iattr_to_fattr(attr, &inarg); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 949 | req->in.h.opcode = FUSE_SETATTR; |
| 950 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 951 | req->in.numargs = 1; |
| 952 | req->in.args[0].size = sizeof(inarg); |
| 953 | req->in.args[0].value = &inarg; |
| 954 | req->out.numargs = 1; |
| 955 | req->out.args[0].size = sizeof(outarg); |
| 956 | req->out.args[0].value = &outarg; |
| 957 | request_send(fc, req); |
| 958 | err = req->out.h.error; |
| 959 | fuse_put_request(fc, req); |
| 960 | if (!err) { |
| 961 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
| 962 | make_bad_inode(inode); |
| 963 | err = -EIO; |
| 964 | } else { |
| 965 | if (is_truncate) { |
| 966 | loff_t origsize = i_size_read(inode); |
| 967 | i_size_write(inode, outarg.attr.size); |
| 968 | if (origsize > outarg.attr.size) |
| 969 | vmtruncate(inode, outarg.attr.size); |
| 970 | } |
| 971 | fuse_change_attributes(inode, &outarg.attr); |
| 972 | fi->i_time = time_to_jiffies(outarg.attr_valid, |
| 973 | outarg.attr_valid_nsec); |
| 974 | } |
| 975 | } else if (err == -EINTR) |
| 976 | fuse_invalidate_attr(inode); |
| 977 | |
| 978 | return err; |
| 979 | } |
| 980 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 981 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
| 982 | struct kstat *stat) |
| 983 | { |
| 984 | struct inode *inode = entry->d_inode; |
| 985 | int err = fuse_revalidate(entry); |
| 986 | if (!err) |
| 987 | generic_fillattr(inode, stat); |
| 988 | |
| 989 | return err; |
| 990 | } |
| 991 | |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 992 | static int fuse_setxattr(struct dentry *entry, const char *name, |
| 993 | const void *value, size_t size, int flags) |
| 994 | { |
| 995 | struct inode *inode = entry->d_inode; |
| 996 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 997 | struct fuse_req *req; |
| 998 | struct fuse_setxattr_in inarg; |
| 999 | int err; |
| 1000 | |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1001 | if (fc->no_setxattr) |
| 1002 | return -EOPNOTSUPP; |
| 1003 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1004 | req = fuse_get_req(fc); |
| 1005 | if (IS_ERR(req)) |
| 1006 | return PTR_ERR(req); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1007 | |
| 1008 | memset(&inarg, 0, sizeof(inarg)); |
| 1009 | inarg.size = size; |
| 1010 | inarg.flags = flags; |
| 1011 | req->in.h.opcode = FUSE_SETXATTR; |
| 1012 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1013 | req->in.numargs = 3; |
| 1014 | req->in.args[0].size = sizeof(inarg); |
| 1015 | req->in.args[0].value = &inarg; |
| 1016 | req->in.args[1].size = strlen(name) + 1; |
| 1017 | req->in.args[1].value = name; |
| 1018 | req->in.args[2].size = size; |
| 1019 | req->in.args[2].value = value; |
| 1020 | request_send(fc, req); |
| 1021 | err = req->out.h.error; |
| 1022 | fuse_put_request(fc, req); |
| 1023 | if (err == -ENOSYS) { |
| 1024 | fc->no_setxattr = 1; |
| 1025 | err = -EOPNOTSUPP; |
| 1026 | } |
| 1027 | return err; |
| 1028 | } |
| 1029 | |
| 1030 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, |
| 1031 | void *value, size_t size) |
| 1032 | { |
| 1033 | struct inode *inode = entry->d_inode; |
| 1034 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1035 | struct fuse_req *req; |
| 1036 | struct fuse_getxattr_in inarg; |
| 1037 | struct fuse_getxattr_out outarg; |
| 1038 | ssize_t ret; |
| 1039 | |
| 1040 | if (fc->no_getxattr) |
| 1041 | return -EOPNOTSUPP; |
| 1042 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1043 | req = fuse_get_req(fc); |
| 1044 | if (IS_ERR(req)) |
| 1045 | return PTR_ERR(req); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1046 | |
| 1047 | memset(&inarg, 0, sizeof(inarg)); |
| 1048 | inarg.size = size; |
| 1049 | req->in.h.opcode = FUSE_GETXATTR; |
| 1050 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1051 | req->in.numargs = 2; |
| 1052 | req->in.args[0].size = sizeof(inarg); |
| 1053 | req->in.args[0].value = &inarg; |
| 1054 | req->in.args[1].size = strlen(name) + 1; |
| 1055 | req->in.args[1].value = name; |
| 1056 | /* This is really two different operations rolled into one */ |
| 1057 | req->out.numargs = 1; |
| 1058 | if (size) { |
| 1059 | req->out.argvar = 1; |
| 1060 | req->out.args[0].size = size; |
| 1061 | req->out.args[0].value = value; |
| 1062 | } else { |
| 1063 | req->out.args[0].size = sizeof(outarg); |
| 1064 | req->out.args[0].value = &outarg; |
| 1065 | } |
| 1066 | request_send(fc, req); |
| 1067 | ret = req->out.h.error; |
| 1068 | if (!ret) |
| 1069 | ret = size ? req->out.args[0].size : outarg.size; |
| 1070 | else { |
| 1071 | if (ret == -ENOSYS) { |
| 1072 | fc->no_getxattr = 1; |
| 1073 | ret = -EOPNOTSUPP; |
| 1074 | } |
| 1075 | } |
| 1076 | fuse_put_request(fc, req); |
| 1077 | return ret; |
| 1078 | } |
| 1079 | |
| 1080 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) |
| 1081 | { |
| 1082 | struct inode *inode = entry->d_inode; |
| 1083 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1084 | struct fuse_req *req; |
| 1085 | struct fuse_getxattr_in inarg; |
| 1086 | struct fuse_getxattr_out outarg; |
| 1087 | ssize_t ret; |
| 1088 | |
| 1089 | if (fc->no_listxattr) |
| 1090 | return -EOPNOTSUPP; |
| 1091 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1092 | req = fuse_get_req(fc); |
| 1093 | if (IS_ERR(req)) |
| 1094 | return PTR_ERR(req); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1095 | |
| 1096 | memset(&inarg, 0, sizeof(inarg)); |
| 1097 | inarg.size = size; |
| 1098 | req->in.h.opcode = FUSE_LISTXATTR; |
| 1099 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1100 | req->in.numargs = 1; |
| 1101 | req->in.args[0].size = sizeof(inarg); |
| 1102 | req->in.args[0].value = &inarg; |
| 1103 | /* This is really two different operations rolled into one */ |
| 1104 | req->out.numargs = 1; |
| 1105 | if (size) { |
| 1106 | req->out.argvar = 1; |
| 1107 | req->out.args[0].size = size; |
| 1108 | req->out.args[0].value = list; |
| 1109 | } else { |
| 1110 | req->out.args[0].size = sizeof(outarg); |
| 1111 | req->out.args[0].value = &outarg; |
| 1112 | } |
| 1113 | request_send(fc, req); |
| 1114 | ret = req->out.h.error; |
| 1115 | if (!ret) |
| 1116 | ret = size ? req->out.args[0].size : outarg.size; |
| 1117 | else { |
| 1118 | if (ret == -ENOSYS) { |
| 1119 | fc->no_listxattr = 1; |
| 1120 | ret = -EOPNOTSUPP; |
| 1121 | } |
| 1122 | } |
| 1123 | fuse_put_request(fc, req); |
| 1124 | return ret; |
| 1125 | } |
| 1126 | |
| 1127 | static int fuse_removexattr(struct dentry *entry, const char *name) |
| 1128 | { |
| 1129 | struct inode *inode = entry->d_inode; |
| 1130 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1131 | struct fuse_req *req; |
| 1132 | int err; |
| 1133 | |
| 1134 | if (fc->no_removexattr) |
| 1135 | return -EOPNOTSUPP; |
| 1136 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1137 | req = fuse_get_req(fc); |
| 1138 | if (IS_ERR(req)) |
| 1139 | return PTR_ERR(req); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1140 | |
| 1141 | req->in.h.opcode = FUSE_REMOVEXATTR; |
| 1142 | req->in.h.nodeid = get_node_id(inode); |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1143 | req->in.numargs = 1; |
| 1144 | req->in.args[0].size = strlen(name) + 1; |
| 1145 | req->in.args[0].value = name; |
| 1146 | request_send(fc, req); |
| 1147 | err = req->out.h.error; |
| 1148 | fuse_put_request(fc, req); |
| 1149 | if (err == -ENOSYS) { |
| 1150 | fc->no_removexattr = 1; |
| 1151 | err = -EOPNOTSUPP; |
| 1152 | } |
| 1153 | return err; |
| 1154 | } |
| 1155 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1156 | static struct inode_operations fuse_dir_inode_operations = { |
| 1157 | .lookup = fuse_lookup, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1158 | .mkdir = fuse_mkdir, |
| 1159 | .symlink = fuse_symlink, |
| 1160 | .unlink = fuse_unlink, |
| 1161 | .rmdir = fuse_rmdir, |
| 1162 | .rename = fuse_rename, |
| 1163 | .link = fuse_link, |
| 1164 | .setattr = fuse_setattr, |
| 1165 | .create = fuse_create, |
| 1166 | .mknod = fuse_mknod, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1167 | .permission = fuse_permission, |
| 1168 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1169 | .setxattr = fuse_setxattr, |
| 1170 | .getxattr = fuse_getxattr, |
| 1171 | .listxattr = fuse_listxattr, |
| 1172 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1173 | }; |
| 1174 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1175 | static const struct file_operations fuse_dir_operations = { |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 1176 | .llseek = generic_file_llseek, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1177 | .read = generic_read_dir, |
| 1178 | .readdir = fuse_readdir, |
| 1179 | .open = fuse_dir_open, |
| 1180 | .release = fuse_dir_release, |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1181 | .fsync = fuse_dir_fsync, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1182 | }; |
| 1183 | |
| 1184 | static struct inode_operations fuse_common_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1185 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1186 | .permission = fuse_permission, |
| 1187 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1188 | .setxattr = fuse_setxattr, |
| 1189 | .getxattr = fuse_getxattr, |
| 1190 | .listxattr = fuse_listxattr, |
| 1191 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1192 | }; |
| 1193 | |
| 1194 | static struct inode_operations fuse_symlink_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1195 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1196 | .follow_link = fuse_follow_link, |
| 1197 | .put_link = fuse_put_link, |
| 1198 | .readlink = generic_readlink, |
| 1199 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1200 | .setxattr = fuse_setxattr, |
| 1201 | .getxattr = fuse_getxattr, |
| 1202 | .listxattr = fuse_listxattr, |
| 1203 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1204 | }; |
| 1205 | |
| 1206 | void fuse_init_common(struct inode *inode) |
| 1207 | { |
| 1208 | inode->i_op = &fuse_common_inode_operations; |
| 1209 | } |
| 1210 | |
| 1211 | void fuse_init_dir(struct inode *inode) |
| 1212 | { |
| 1213 | inode->i_op = &fuse_dir_inode_operations; |
| 1214 | inode->i_fop = &fuse_dir_operations; |
| 1215 | } |
| 1216 | |
| 1217 | void fuse_init_symlink(struct inode *inode) |
| 1218 | { |
| 1219 | inode->i_op = &fuse_symlink_inode_operations; |
| 1220 | } |