Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -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/slab.h> |
| 13 | #include <linux/file.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/module.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 17 | #include <linux/parser.h> |
| 18 | #include <linux/statfs.h> |
Miklos Szeredi | 9c8ef56 | 2006-06-25 05:48:55 -0700 | [diff] [blame] | 19 | #include <linux/random.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 21 | #include <linux/exportfs.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 22 | |
| 23 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); |
| 24 | MODULE_DESCRIPTION("Filesystem in Userspace"); |
| 25 | MODULE_LICENSE("GPL"); |
| 26 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 27 | static struct kmem_cache *fuse_inode_cachep; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 28 | struct list_head fuse_conn_list; |
| 29 | DEFINE_MUTEX(fuse_mutex); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 30 | |
| 31 | #define FUSE_SUPER_MAGIC 0x65735546 |
| 32 | |
Miklos Szeredi | d1875db | 2008-02-08 04:21:43 -0800 | [diff] [blame] | 33 | #define FUSE_DEFAULT_BLKSIZE 512 |
| 34 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 35 | struct fuse_mount_data { |
| 36 | int fd; |
| 37 | unsigned rootmode; |
| 38 | unsigned user_id; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 39 | unsigned group_id; |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 40 | unsigned fd_present:1; |
| 41 | unsigned rootmode_present:1; |
| 42 | unsigned user_id_present:1; |
| 43 | unsigned group_id_present:1; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 44 | unsigned flags; |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 45 | unsigned max_read; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 46 | unsigned blksize; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
| 49 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
| 50 | { |
| 51 | struct inode *inode; |
| 52 | struct fuse_inode *fi; |
| 53 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 54 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 55 | if (!inode) |
| 56 | return NULL; |
| 57 | |
| 58 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 59 | fi->i_time = 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 60 | fi->nodeid = 0; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 61 | fi->nlookup = 0; |
John Muir | fbee36b | 2007-11-28 16:22:02 -0800 | [diff] [blame] | 62 | fi->attr_version = 0; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 63 | fi->writectr = 0; |
Miklos Szeredi | 93a8c3c | 2007-10-18 03:07:03 -0700 | [diff] [blame] | 64 | INIT_LIST_HEAD(&fi->write_files); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 65 | INIT_LIST_HEAD(&fi->queued_writes); |
| 66 | INIT_LIST_HEAD(&fi->writepages); |
| 67 | init_waitqueue_head(&fi->page_waitq); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 68 | fi->forget_req = fuse_request_alloc(); |
| 69 | if (!fi->forget_req) { |
| 70 | kmem_cache_free(fuse_inode_cachep, inode); |
| 71 | return NULL; |
| 72 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 73 | |
| 74 | return inode; |
| 75 | } |
| 76 | |
| 77 | static void fuse_destroy_inode(struct inode *inode) |
| 78 | { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 79 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 93a8c3c | 2007-10-18 03:07:03 -0700 | [diff] [blame] | 80 | BUG_ON(!list_empty(&fi->write_files)); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 81 | BUG_ON(!list_empty(&fi->queued_writes)); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 82 | if (fi->forget_req) |
| 83 | fuse_request_free(fi->forget_req); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 84 | kmem_cache_free(fuse_inode_cachep, inode); |
| 85 | } |
| 86 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 87 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 88 | u64 nodeid, u64 nlookup) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 89 | { |
| 90 | struct fuse_forget_in *inarg = &req->misc.forget_in; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 91 | inarg->nlookup = nlookup; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 92 | req->in.h.opcode = FUSE_FORGET; |
| 93 | req->in.h.nodeid = nodeid; |
| 94 | req->in.numargs = 1; |
| 95 | req->in.args[0].size = sizeof(struct fuse_forget_in); |
| 96 | req->in.args[0].value = inarg; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 97 | fuse_request_send_noreply(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 100 | static void fuse_clear_inode(struct inode *inode) |
| 101 | { |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 102 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
| 103 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 104 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 105 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 106 | fi->forget_req = NULL; |
| 107 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 110 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
| 111 | { |
| 112 | if (*flags & MS_MANDLOCK) |
| 113 | return -EINVAL; |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 118 | void fuse_truncate(struct address_space *mapping, loff_t offset) |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 119 | { |
| 120 | /* See vmtruncate() */ |
| 121 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); |
| 122 | truncate_inode_pages(mapping, offset); |
| 123 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); |
| 124 | } |
| 125 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 126 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
| 127 | u64 attr_valid) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 128 | { |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 129 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 131 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 132 | fi->attr_version = ++fc->attr_version; |
| 133 | fi->i_time = attr_valid; |
| 134 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 135 | inode->i_ino = attr->ino; |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 136 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 137 | inode->i_nlink = attr->nlink; |
| 138 | inode->i_uid = attr->uid; |
| 139 | inode->i_gid = attr->gid; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 140 | inode->i_blocks = attr->blocks; |
| 141 | inode->i_atime.tv_sec = attr->atime; |
| 142 | inode->i_atime.tv_nsec = attr->atimensec; |
| 143 | inode->i_mtime.tv_sec = attr->mtime; |
| 144 | inode->i_mtime.tv_nsec = attr->mtimensec; |
| 145 | inode->i_ctime.tv_sec = attr->ctime; |
| 146 | inode->i_ctime.tv_nsec = attr->ctimensec; |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 147 | |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 148 | if (attr->blksize != 0) |
| 149 | inode->i_blkbits = ilog2(attr->blksize); |
| 150 | else |
| 151 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; |
| 152 | |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 153 | /* |
| 154 | * Don't set the sticky bit in i_mode, unless we want the VFS |
| 155 | * to check permissions. This prevents failures due to the |
| 156 | * check in may_delete(). |
| 157 | */ |
| 158 | fi->orig_i_mode = inode->i_mode; |
| 159 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
| 160 | inode->i_mode &= ~S_ISVTX; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
| 164 | u64 attr_valid, u64 attr_version) |
| 165 | { |
| 166 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 167 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 168 | loff_t oldsize; |
| 169 | |
| 170 | spin_lock(&fc->lock); |
| 171 | if (attr_version != 0 && fi->attr_version > attr_version) { |
| 172 | spin_unlock(&fc->lock); |
| 173 | return; |
| 174 | } |
| 175 | |
| 176 | fuse_change_attributes_common(inode, attr, attr_valid); |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 177 | |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 178 | oldsize = inode->i_size; |
| 179 | i_size_write(inode, attr->size); |
| 180 | spin_unlock(&fc->lock); |
| 181 | |
| 182 | if (S_ISREG(inode->i_mode) && oldsize != attr->size) { |
| 183 | if (attr->size < oldsize) |
| 184 | fuse_truncate(inode->i_mapping, attr->size); |
Miklos Szeredi | b100997 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 185 | invalidate_inode_pages2(inode->i_mapping); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 186 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) |
| 190 | { |
| 191 | inode->i_mode = attr->mode & S_IFMT; |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 192 | inode->i_size = attr->size; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 193 | if (S_ISREG(inode->i_mode)) { |
| 194 | fuse_init_common(inode); |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 195 | fuse_init_file_inode(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 196 | } else if (S_ISDIR(inode->i_mode)) |
| 197 | fuse_init_dir(inode); |
| 198 | else if (S_ISLNK(inode->i_mode)) |
| 199 | fuse_init_symlink(inode); |
| 200 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
| 201 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { |
| 202 | fuse_init_common(inode); |
| 203 | init_special_inode(inode, inode->i_mode, |
| 204 | new_decode_dev(attr->rdev)); |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 205 | } else |
| 206 | BUG(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
| 210 | { |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 211 | u64 nodeid = *(u64 *) _nodeidp; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 212 | if (get_node_id(inode) == nodeid) |
| 213 | return 1; |
| 214 | else |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) |
| 219 | { |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 220 | u64 nodeid = *(u64 *) _nodeidp; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 221 | get_fuse_inode(inode)->nodeid = nodeid; |
| 222 | return 0; |
| 223 | } |
| 224 | |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 225 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 226 | int generation, struct fuse_attr *attr, |
| 227 | u64 attr_valid, u64 attr_version) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 228 | { |
| 229 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 230 | struct fuse_inode *fi; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 231 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 232 | |
| 233 | retry: |
| 234 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
| 235 | if (!inode) |
| 236 | return NULL; |
| 237 | |
| 238 | if ((inode->i_state & I_NEW)) { |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 239 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 240 | inode->i_generation = generation; |
| 241 | inode->i_data.backing_dev_info = &fc->bdi; |
| 242 | fuse_init_inode(inode, attr); |
| 243 | unlock_new_inode(inode); |
| 244 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 245 | /* Inode has changed type, any I/O on the old should fail */ |
| 246 | make_bad_inode(inode); |
| 247 | iput(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 248 | goto retry; |
| 249 | } |
| 250 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 251 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 252 | spin_lock(&fc->lock); |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 253 | fi->nlookup++; |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 254 | spin_unlock(&fc->lock); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 255 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
| 256 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 257 | return inode; |
| 258 | } |
| 259 | |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 260 | static void fuse_umount_begin(struct super_block *sb) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 261 | { |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 262 | fuse_abort_conn(get_fuse_conn_super(sb)); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 263 | } |
| 264 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 265 | static void fuse_send_destroy(struct fuse_conn *fc) |
| 266 | { |
| 267 | struct fuse_req *req = fc->destroy_req; |
| 268 | if (req && fc->conn_init) { |
| 269 | fc->destroy_req = NULL; |
| 270 | req->in.h.opcode = FUSE_DESTROY; |
| 271 | req->force = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 272 | fuse_request_send(fc, req); |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 273 | fuse_put_request(fc, req); |
| 274 | } |
| 275 | } |
| 276 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 277 | static void fuse_put_super(struct super_block *sb) |
| 278 | { |
| 279 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 280 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 281 | fuse_send_destroy(fc); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 282 | spin_lock(&fc->lock); |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 283 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 284 | fc->blocked = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 285 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 286 | /* Flush all readers on this fs */ |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 287 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 288 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 289 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 290 | wake_up_all(&fc->reserved_req_waitq); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 291 | mutex_lock(&fuse_mutex); |
| 292 | list_del(&fc->entry); |
| 293 | fuse_ctl_remove_conn(fc); |
| 294 | mutex_unlock(&fuse_mutex); |
Miklos Szeredi | 26c3679 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 295 | bdi_destroy(&fc->bdi); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 296 | fuse_conn_put(fc); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 297 | } |
| 298 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 299 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
| 300 | { |
| 301 | stbuf->f_type = FUSE_SUPER_MAGIC; |
| 302 | stbuf->f_bsize = attr->bsize; |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 303 | stbuf->f_frsize = attr->frsize; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 304 | stbuf->f_blocks = attr->blocks; |
| 305 | stbuf->f_bfree = attr->bfree; |
| 306 | stbuf->f_bavail = attr->bavail; |
| 307 | stbuf->f_files = attr->files; |
| 308 | stbuf->f_ffree = attr->ffree; |
| 309 | stbuf->f_namelen = attr->namelen; |
| 310 | /* fsid is left zero */ |
| 311 | } |
| 312 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 313 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 314 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 315 | struct super_block *sb = dentry->d_sb; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 316 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 317 | struct fuse_req *req; |
| 318 | struct fuse_statfs_out outarg; |
| 319 | int err; |
| 320 | |
Miklos Szeredi | e57ac68 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 321 | if (!fuse_allow_task(fc, current)) { |
| 322 | buf->f_type = FUSE_SUPER_MAGIC; |
| 323 | return 0; |
| 324 | } |
| 325 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 326 | req = fuse_get_req(fc); |
| 327 | if (IS_ERR(req)) |
| 328 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 329 | |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 330 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 331 | req->in.numargs = 0; |
| 332 | req->in.h.opcode = FUSE_STATFS; |
Miklos Szeredi | 5b35e8e | 2006-09-29 01:59:34 -0700 | [diff] [blame] | 333 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 334 | req->out.numargs = 1; |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 335 | req->out.args[0].size = |
| 336 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 337 | req->out.args[0].value = &outarg; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 338 | fuse_request_send(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 339 | err = req->out.h.error; |
| 340 | if (!err) |
| 341 | convert_fuse_statfs(buf, &outarg.st); |
| 342 | fuse_put_request(fc, req); |
| 343 | return err; |
| 344 | } |
| 345 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 346 | enum { |
| 347 | OPT_FD, |
| 348 | OPT_ROOTMODE, |
| 349 | OPT_USER_ID, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 350 | OPT_GROUP_ID, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 351 | OPT_DEFAULT_PERMISSIONS, |
| 352 | OPT_ALLOW_OTHER, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 353 | OPT_MAX_READ, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 354 | OPT_BLKSIZE, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 355 | OPT_ERR |
| 356 | }; |
| 357 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 358 | static const match_table_t tokens = { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 359 | {OPT_FD, "fd=%u"}, |
| 360 | {OPT_ROOTMODE, "rootmode=%o"}, |
| 361 | {OPT_USER_ID, "user_id=%u"}, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 362 | {OPT_GROUP_ID, "group_id=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 363 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
| 364 | {OPT_ALLOW_OTHER, "allow_other"}, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 365 | {OPT_MAX_READ, "max_read=%u"}, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 366 | {OPT_BLKSIZE, "blksize=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 367 | {OPT_ERR, NULL} |
| 368 | }; |
| 369 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 370 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 371 | { |
| 372 | char *p; |
| 373 | memset(d, 0, sizeof(struct fuse_mount_data)); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 374 | d->max_read = ~0; |
Miklos Szeredi | d1875db | 2008-02-08 04:21:43 -0800 | [diff] [blame] | 375 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 376 | |
| 377 | while ((p = strsep(&opt, ",")) != NULL) { |
| 378 | int token; |
| 379 | int value; |
| 380 | substring_t args[MAX_OPT_ARGS]; |
| 381 | if (!*p) |
| 382 | continue; |
| 383 | |
| 384 | token = match_token(p, tokens, args); |
| 385 | switch (token) { |
| 386 | case OPT_FD: |
| 387 | if (match_int(&args[0], &value)) |
| 388 | return 0; |
| 389 | d->fd = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 390 | d->fd_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 391 | break; |
| 392 | |
| 393 | case OPT_ROOTMODE: |
| 394 | if (match_octal(&args[0], &value)) |
| 395 | return 0; |
Timo Savola | a5bfffac | 2007-04-08 16:04:00 -0700 | [diff] [blame] | 396 | if (!fuse_valid_type(value)) |
| 397 | return 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 398 | d->rootmode = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 399 | d->rootmode_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 400 | break; |
| 401 | |
| 402 | case OPT_USER_ID: |
| 403 | if (match_int(&args[0], &value)) |
| 404 | return 0; |
| 405 | d->user_id = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 406 | d->user_id_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 407 | break; |
| 408 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 409 | case OPT_GROUP_ID: |
| 410 | if (match_int(&args[0], &value)) |
| 411 | return 0; |
| 412 | d->group_id = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 413 | d->group_id_present = 1; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 414 | break; |
| 415 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 416 | case OPT_DEFAULT_PERMISSIONS: |
| 417 | d->flags |= FUSE_DEFAULT_PERMISSIONS; |
| 418 | break; |
| 419 | |
| 420 | case OPT_ALLOW_OTHER: |
| 421 | d->flags |= FUSE_ALLOW_OTHER; |
| 422 | break; |
| 423 | |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 424 | case OPT_MAX_READ: |
| 425 | if (match_int(&args[0], &value)) |
| 426 | return 0; |
| 427 | d->max_read = value; |
| 428 | break; |
| 429 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 430 | case OPT_BLKSIZE: |
| 431 | if (!is_bdev || match_int(&args[0], &value)) |
| 432 | return 0; |
| 433 | d->blksize = value; |
| 434 | break; |
| 435 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 436 | default: |
| 437 | return 0; |
| 438 | } |
| 439 | } |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 440 | |
| 441 | if (!d->fd_present || !d->rootmode_present || |
| 442 | !d->user_id_present || !d->group_id_present) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 443 | return 0; |
| 444 | |
| 445 | return 1; |
| 446 | } |
| 447 | |
| 448 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 449 | { |
| 450 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); |
| 451 | |
| 452 | seq_printf(m, ",user_id=%u", fc->user_id); |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 453 | seq_printf(m, ",group_id=%u", fc->group_id); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 454 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
| 455 | seq_puts(m, ",default_permissions"); |
| 456 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 457 | seq_puts(m, ",allow_other"); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 458 | if (fc->max_read != ~0) |
| 459 | seq_printf(m, ",max_read=%u", fc->max_read); |
Miklos Szeredi | d1875db | 2008-02-08 04:21:43 -0800 | [diff] [blame] | 460 | if (mnt->mnt_sb->s_bdev && |
| 461 | mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
| 462 | seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 463 | return 0; |
| 464 | } |
| 465 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 466 | int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 467 | { |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 468 | int err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 469 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 470 | memset(fc, 0, sizeof(*fc)); |
| 471 | spin_lock_init(&fc->lock); |
| 472 | mutex_init(&fc->inst_mutex); |
| 473 | atomic_set(&fc->count, 1); |
| 474 | init_waitqueue_head(&fc->waitq); |
| 475 | init_waitqueue_head(&fc->blocked_waitq); |
| 476 | init_waitqueue_head(&fc->reserved_req_waitq); |
| 477 | INIT_LIST_HEAD(&fc->pending); |
| 478 | INIT_LIST_HEAD(&fc->processing); |
| 479 | INIT_LIST_HEAD(&fc->io); |
| 480 | INIT_LIST_HEAD(&fc->interrupts); |
| 481 | INIT_LIST_HEAD(&fc->bg_queue); |
| 482 | INIT_LIST_HEAD(&fc->entry); |
| 483 | atomic_set(&fc->num_waiting, 0); |
| 484 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
| 485 | fc->bdi.unplug_io_fn = default_unplug_io_fn; |
| 486 | /* fuse does it's own writeback accounting */ |
| 487 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; |
| 488 | fc->khctr = 0; |
| 489 | fc->polled_files = RB_ROOT; |
| 490 | fc->dev = sb->s_dev; |
| 491 | err = bdi_init(&fc->bdi); |
| 492 | if (err) |
| 493 | goto error_mutex_destroy; |
| 494 | if (sb->s_bdev) { |
| 495 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", |
| 496 | MAJOR(fc->dev), MINOR(fc->dev)); |
| 497 | } else { |
| 498 | err = bdi_register_dev(&fc->bdi, fc->dev); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 499 | } |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 500 | if (err) |
| 501 | goto error_bdi_destroy; |
| 502 | /* |
| 503 | * For a single fuse filesystem use max 1% of dirty + |
| 504 | * writeback threshold. |
| 505 | * |
| 506 | * This gives about 1M of write buffer for memory maps on a |
| 507 | * machine with 1G and 10% dirty_ratio, which should be more |
| 508 | * than enough. |
| 509 | * |
| 510 | * Privileged users can raise it by writing to |
| 511 | * |
| 512 | * /sys/class/bdi/<bdi>/max_ratio |
| 513 | */ |
| 514 | bdi_set_max_ratio(&fc->bdi, 1); |
| 515 | fc->reqctr = 0; |
| 516 | fc->blocked = 1; |
| 517 | fc->attr_version = 1; |
| 518 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
Miklos Szeredi | b6f2fcb | 2008-04-30 00:54:34 -0700 | [diff] [blame] | 519 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 520 | return 0; |
| 521 | |
| 522 | error_bdi_destroy: |
Miklos Szeredi | b6f2fcb | 2008-04-30 00:54:34 -0700 | [diff] [blame] | 523 | bdi_destroy(&fc->bdi); |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 524 | error_mutex_destroy: |
Miklos Szeredi | b6f2fcb | 2008-04-30 00:54:34 -0700 | [diff] [blame] | 525 | mutex_destroy(&fc->inst_mutex); |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 526 | return err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 527 | } |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 528 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 529 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 530 | void fuse_conn_put(struct fuse_conn *fc) |
| 531 | { |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 532 | if (atomic_dec_and_test(&fc->count)) { |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 533 | if (fc->destroy_req) |
| 534 | fuse_request_free(fc->destroy_req); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 535 | mutex_destroy(&fc->inst_mutex); |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 536 | fc->release(fc); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 537 | } |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) |
| 541 | { |
| 542 | atomic_inc(&fc->count); |
| 543 | return fc; |
| 544 | } |
| 545 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 546 | static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 547 | { |
| 548 | struct fuse_attr attr; |
| 549 | memset(&attr, 0, sizeof(attr)); |
| 550 | |
| 551 | attr.mode = mode; |
| 552 | attr.ino = FUSE_ROOT_ID; |
Miklos Szeredi | 074406f | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 553 | attr.nlink = 1; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 554 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 555 | } |
| 556 | |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 557 | struct fuse_inode_handle { |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 558 | u64 nodeid; |
| 559 | u32 generation; |
| 560 | }; |
| 561 | |
| 562 | static struct dentry *fuse_get_dentry(struct super_block *sb, |
| 563 | struct fuse_inode_handle *handle) |
| 564 | { |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 565 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 566 | struct inode *inode; |
| 567 | struct dentry *entry; |
| 568 | int err = -ESTALE; |
| 569 | |
| 570 | if (handle->nodeid == 0) |
| 571 | goto out_err; |
| 572 | |
| 573 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 574 | if (!inode) { |
| 575 | struct fuse_entry_out outarg; |
| 576 | struct qstr name; |
| 577 | |
| 578 | if (!fc->export_support) |
| 579 | goto out_err; |
| 580 | |
| 581 | name.len = 1; |
| 582 | name.name = "."; |
| 583 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
| 584 | &inode); |
| 585 | if (err && err != -ENOENT) |
| 586 | goto out_err; |
| 587 | if (err || !inode) { |
| 588 | err = -ESTALE; |
| 589 | goto out_err; |
| 590 | } |
| 591 | err = -EIO; |
| 592 | if (get_node_id(inode) != handle->nodeid) |
| 593 | goto out_iput; |
| 594 | } |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 595 | err = -ESTALE; |
| 596 | if (inode->i_generation != handle->generation) |
| 597 | goto out_iput; |
| 598 | |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 599 | entry = d_obtain_alias(inode); |
| 600 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) { |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 601 | entry->d_op = &fuse_dentry_operations; |
| 602 | fuse_invalidate_entry_cache(entry); |
| 603 | } |
| 604 | |
| 605 | return entry; |
| 606 | |
| 607 | out_iput: |
| 608 | iput(inode); |
| 609 | out_err: |
| 610 | return ERR_PTR(err); |
| 611 | } |
| 612 | |
| 613 | static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, |
| 614 | int connectable) |
| 615 | { |
| 616 | struct inode *inode = dentry->d_inode; |
| 617 | bool encode_parent = connectable && !S_ISDIR(inode->i_mode); |
| 618 | int len = encode_parent ? 6 : 3; |
| 619 | u64 nodeid; |
| 620 | u32 generation; |
| 621 | |
| 622 | if (*max_len < len) |
| 623 | return 255; |
| 624 | |
| 625 | nodeid = get_fuse_inode(inode)->nodeid; |
| 626 | generation = inode->i_generation; |
| 627 | |
| 628 | fh[0] = (u32)(nodeid >> 32); |
| 629 | fh[1] = (u32)(nodeid & 0xffffffff); |
| 630 | fh[2] = generation; |
| 631 | |
| 632 | if (encode_parent) { |
| 633 | struct inode *parent; |
| 634 | |
| 635 | spin_lock(&dentry->d_lock); |
| 636 | parent = dentry->d_parent->d_inode; |
| 637 | nodeid = get_fuse_inode(parent)->nodeid; |
| 638 | generation = parent->i_generation; |
| 639 | spin_unlock(&dentry->d_lock); |
| 640 | |
| 641 | fh[3] = (u32)(nodeid >> 32); |
| 642 | fh[4] = (u32)(nodeid & 0xffffffff); |
| 643 | fh[5] = generation; |
| 644 | } |
| 645 | |
| 646 | *max_len = len; |
| 647 | return encode_parent ? 0x82 : 0x81; |
| 648 | } |
| 649 | |
| 650 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, |
| 651 | struct fid *fid, int fh_len, int fh_type) |
| 652 | { |
| 653 | struct fuse_inode_handle handle; |
| 654 | |
| 655 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) |
| 656 | return NULL; |
| 657 | |
| 658 | handle.nodeid = (u64) fid->raw[0] << 32; |
| 659 | handle.nodeid |= (u64) fid->raw[1]; |
| 660 | handle.generation = fid->raw[2]; |
| 661 | return fuse_get_dentry(sb, &handle); |
| 662 | } |
| 663 | |
| 664 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, |
| 665 | struct fid *fid, int fh_len, int fh_type) |
| 666 | { |
| 667 | struct fuse_inode_handle parent; |
| 668 | |
| 669 | if (fh_type != 0x82 || fh_len < 6) |
| 670 | return NULL; |
| 671 | |
| 672 | parent.nodeid = (u64) fid->raw[3] << 32; |
| 673 | parent.nodeid |= (u64) fid->raw[4]; |
| 674 | parent.generation = fid->raw[5]; |
| 675 | return fuse_get_dentry(sb, &parent); |
| 676 | } |
| 677 | |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 678 | static struct dentry *fuse_get_parent(struct dentry *child) |
| 679 | { |
| 680 | struct inode *child_inode = child->d_inode; |
| 681 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
| 682 | struct inode *inode; |
| 683 | struct dentry *parent; |
| 684 | struct fuse_entry_out outarg; |
| 685 | struct qstr name; |
| 686 | int err; |
| 687 | |
| 688 | if (!fc->export_support) |
| 689 | return ERR_PTR(-ESTALE); |
| 690 | |
| 691 | name.len = 2; |
| 692 | name.name = ".."; |
| 693 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
| 694 | &name, &outarg, &inode); |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 695 | if (err) { |
| 696 | if (err == -ENOENT) |
| 697 | return ERR_PTR(-ESTALE); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 698 | return ERR_PTR(err); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 699 | } |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 700 | |
| 701 | parent = d_obtain_alias(inode); |
| 702 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) { |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 703 | parent->d_op = &fuse_dentry_operations; |
| 704 | fuse_invalidate_entry_cache(parent); |
| 705 | } |
| 706 | |
| 707 | return parent; |
| 708 | } |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 709 | |
| 710 | static const struct export_operations fuse_export_operations = { |
| 711 | .fh_to_dentry = fuse_fh_to_dentry, |
| 712 | .fh_to_parent = fuse_fh_to_parent, |
| 713 | .encode_fh = fuse_encode_fh, |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 714 | .get_parent = fuse_get_parent, |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 715 | }; |
| 716 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 717 | static const struct super_operations fuse_super_operations = { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 718 | .alloc_inode = fuse_alloc_inode, |
| 719 | .destroy_inode = fuse_destroy_inode, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 720 | .clear_inode = fuse_clear_inode, |
Miklos Szeredi | ead5f0b | 2007-05-23 13:57:54 -0700 | [diff] [blame] | 721 | .drop_inode = generic_delete_inode, |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 722 | .remount_fs = fuse_remount_fs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 723 | .put_super = fuse_put_super, |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 724 | .umount_begin = fuse_umount_begin, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 725 | .statfs = fuse_statfs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 726 | .show_options = fuse_show_options, |
| 727 | }; |
| 728 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 729 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
| 730 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 731 | struct fuse_init_out *arg = &req->misc.init_out; |
| 732 | |
| 733 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) |
| 734 | fc->conn_error = 1; |
| 735 | else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 736 | unsigned long ra_pages; |
| 737 | |
| 738 | if (arg->minor >= 6) { |
| 739 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; |
| 740 | if (arg->flags & FUSE_ASYNC_READ) |
| 741 | fc->async_read = 1; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 742 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
| 743 | fc->no_lock = 1; |
Miklos Szeredi | 6ff958e | 2007-10-18 03:07:02 -0700 | [diff] [blame] | 744 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
| 745 | fc->atomic_o_trunc = 1; |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 746 | if (arg->minor >= 9) { |
| 747 | /* LOOKUP has dependency on proto version */ |
| 748 | if (arg->flags & FUSE_EXPORT_SUPPORT) |
| 749 | fc->export_support = 1; |
| 750 | } |
Miklos Szeredi | 78bb6cb | 2008-05-12 14:02:32 -0700 | [diff] [blame] | 751 | if (arg->flags & FUSE_BIG_WRITES) |
| 752 | fc->big_writes = 1; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 753 | } else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 754 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 755 | fc->no_lock = 1; |
| 756 | } |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 757 | |
| 758 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 759 | fc->minor = arg->minor; |
| 760 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; |
Miklos Szeredi | f948d56 | 2008-06-17 18:05:40 +0200 | [diff] [blame] | 761 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 762 | fc->conn_init = 1; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 763 | } |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 764 | fc->blocked = 0; |
| 765 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 766 | } |
| 767 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 768 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 769 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 770 | struct fuse_init_in *arg = &req->misc.init_in; |
Miklos Szeredi | 095da6c | 2006-01-16 22:14:52 -0800 | [diff] [blame] | 771 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 772 | arg->major = FUSE_KERNEL_VERSION; |
| 773 | arg->minor = FUSE_KERNEL_MINOR_VERSION; |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 774 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
Miklos Szeredi | 78bb6cb | 2008-05-12 14:02:32 -0700 | [diff] [blame] | 775 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 776 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 777 | req->in.h.opcode = FUSE_INIT; |
| 778 | req->in.numargs = 1; |
| 779 | req->in.args[0].size = sizeof(*arg); |
| 780 | req->in.args[0].value = arg; |
| 781 | req->out.numargs = 1; |
| 782 | /* Variable length arguement used for backward compatibility |
| 783 | with interface version < 7.5. Rest of init_out is zeroed |
| 784 | by do_get_request(), so a short reply is not a problem */ |
| 785 | req->out.argvar = 1; |
| 786 | req->out.args[0].size = sizeof(struct fuse_init_out); |
| 787 | req->out.args[0].value = &req->misc.init_out; |
| 788 | req->end = process_init_reply; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 789 | fuse_request_send_background(fc, req); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 790 | } |
| 791 | |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 792 | static void fuse_free_conn(struct fuse_conn *fc) |
| 793 | { |
| 794 | kfree(fc); |
| 795 | } |
| 796 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 797 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
| 798 | { |
| 799 | struct fuse_conn *fc; |
| 800 | struct inode *root; |
| 801 | struct fuse_mount_data d; |
| 802 | struct file *file; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 803 | struct dentry *root_dentry; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 804 | struct fuse_req *init_req; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 805 | int err; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 806 | int is_bdev = sb->s_bdev != NULL; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 807 | |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 808 | err = -EINVAL; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 809 | if (sb->s_flags & MS_MANDLOCK) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 810 | goto err; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 811 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 812 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 813 | goto err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 814 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 815 | if (is_bdev) { |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 816 | #ifdef CONFIG_BLOCK |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 817 | err = -EINVAL; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 818 | if (!sb_set_blocksize(sb, d.blksize)) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 819 | goto err; |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 820 | #endif |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 821 | } else { |
| 822 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 823 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 824 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 825 | sb->s_magic = FUSE_SUPER_MAGIC; |
| 826 | sb->s_op = &fuse_super_operations; |
| 827 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 828 | sb->s_export_op = &fuse_export_operations; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 829 | |
| 830 | file = fget(d.fd); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 831 | err = -EINVAL; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 832 | if (!file) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 833 | goto err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 834 | |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 835 | if (file->f_op != &fuse_dev_operations) |
| 836 | goto err_fput; |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 837 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 838 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 839 | err = -ENOMEM; |
| 840 | if (!fc) |
| 841 | goto err_fput; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 842 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 843 | err = fuse_conn_init(fc, sb); |
| 844 | if (err) { |
| 845 | kfree(fc); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 846 | goto err_fput; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 847 | } |
| 848 | |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 849 | fc->release = fuse_free_conn; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 850 | fc->flags = d.flags; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 851 | fc->user_id = d.user_id; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 852 | fc->group_id = d.group_id; |
Miklos Szeredi | f948d56 | 2008-06-17 18:05:40 +0200 | [diff] [blame] | 853 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 854 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 855 | /* Used by get_root_inode() */ |
| 856 | sb->s_fs_info = fc; |
| 857 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 858 | err = -ENOMEM; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 859 | root = fuse_get_root_inode(sb, d.rootmode); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 860 | if (!root) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 861 | goto err_put_conn; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 862 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 863 | root_dentry = d_alloc_root(root); |
| 864 | if (!root_dentry) { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 865 | iput(root); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 866 | goto err_put_conn; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 867 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 868 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 869 | init_req = fuse_request_alloc(); |
| 870 | if (!init_req) |
| 871 | goto err_put_root; |
| 872 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 873 | if (is_bdev) { |
| 874 | fc->destroy_req = fuse_request_alloc(); |
| 875 | if (!fc->destroy_req) |
Julia Lawall | 17e18ab | 2008-10-16 16:08:56 +0200 | [diff] [blame] | 876 | goto err_free_init_req; |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 877 | } |
| 878 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 879 | mutex_lock(&fuse_mutex); |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 880 | err = -EINVAL; |
| 881 | if (file->private_data) |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 882 | goto err_unlock; |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 883 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 884 | err = fuse_ctl_add_conn(fc); |
| 885 | if (err) |
| 886 | goto err_unlock; |
| 887 | |
| 888 | list_add_tail(&fc->entry, &fuse_conn_list); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 889 | sb->s_root = root_dentry; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 890 | fc->connected = 1; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 891 | file->private_data = fuse_conn_get(fc); |
| 892 | mutex_unlock(&fuse_mutex); |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 893 | /* |
| 894 | * atomic_dec_and_test() in fput() provides the necessary |
| 895 | * memory barrier for file->private_data to be visible on all |
| 896 | * CPUs after this |
| 897 | */ |
| 898 | fput(file); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 899 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 900 | fuse_send_init(fc, init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 901 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 902 | return 0; |
| 903 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 904 | err_unlock: |
| 905 | mutex_unlock(&fuse_mutex); |
Julia Lawall | 17e18ab | 2008-10-16 16:08:56 +0200 | [diff] [blame] | 906 | err_free_init_req: |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 907 | fuse_request_free(init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 908 | err_put_root: |
| 909 | dput(root_dentry); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 910 | err_put_conn: |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 911 | fuse_conn_put(fc); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 912 | err_fput: |
| 913 | fput(file); |
| 914 | err: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 915 | return err; |
| 916 | } |
| 917 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 918 | static int fuse_get_sb(struct file_system_type *fs_type, |
| 919 | int flags, const char *dev_name, |
| 920 | void *raw_data, struct vfsmount *mnt) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 921 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 922 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 923 | } |
| 924 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 925 | static struct file_system_type fuse_fs_type = { |
| 926 | .owner = THIS_MODULE, |
| 927 | .name = "fuse", |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 928 | .fs_flags = FS_HAS_SUBTYPE, |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 929 | .get_sb = fuse_get_sb, |
| 930 | .kill_sb = kill_anon_super, |
| 931 | }; |
| 932 | |
| 933 | #ifdef CONFIG_BLOCK |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 934 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
| 935 | int flags, const char *dev_name, |
| 936 | void *raw_data, struct vfsmount *mnt) |
| 937 | { |
| 938 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, |
| 939 | mnt); |
| 940 | } |
| 941 | |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 942 | static struct file_system_type fuseblk_fs_type = { |
| 943 | .owner = THIS_MODULE, |
| 944 | .name = "fuseblk", |
| 945 | .get_sb = fuse_get_sb_blk, |
| 946 | .kill_sb = kill_block_super, |
Alexey Dobriyan | edad01e | 2007-06-16 10:16:05 -0700 | [diff] [blame] | 947 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 948 | }; |
| 949 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 950 | static inline int register_fuseblk(void) |
| 951 | { |
| 952 | return register_filesystem(&fuseblk_fs_type); |
| 953 | } |
| 954 | |
| 955 | static inline void unregister_fuseblk(void) |
| 956 | { |
| 957 | unregister_filesystem(&fuseblk_fs_type); |
| 958 | } |
| 959 | #else |
| 960 | static inline int register_fuseblk(void) |
| 961 | { |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | static inline void unregister_fuseblk(void) |
| 966 | { |
| 967 | } |
| 968 | #endif |
| 969 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 970 | static void fuse_inode_init_once(void *foo) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 971 | { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 972 | struct inode *inode = foo; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 973 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 974 | inode_init_once(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | static int __init fuse_fs_init(void) |
| 978 | { |
| 979 | int err; |
| 980 | |
| 981 | err = register_filesystem(&fuse_fs_type); |
| 982 | if (err) |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 983 | goto out; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 984 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 985 | err = register_fuseblk(); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 986 | if (err) |
| 987 | goto out_unreg; |
| 988 | |
| 989 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
| 990 | sizeof(struct fuse_inode), |
| 991 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 992 | fuse_inode_init_once); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 993 | err = -ENOMEM; |
| 994 | if (!fuse_inode_cachep) |
| 995 | goto out_unreg2; |
| 996 | |
| 997 | return 0; |
| 998 | |
| 999 | out_unreg2: |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1000 | unregister_fuseblk(); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1001 | out_unreg: |
| 1002 | unregister_filesystem(&fuse_fs_type); |
| 1003 | out: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1004 | return err; |
| 1005 | } |
| 1006 | |
| 1007 | static void fuse_fs_cleanup(void) |
| 1008 | { |
| 1009 | unregister_filesystem(&fuse_fs_type); |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1010 | unregister_fuseblk(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1011 | kmem_cache_destroy(fuse_inode_cachep); |
| 1012 | } |
| 1013 | |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1014 | static struct kobject *fuse_kobj; |
| 1015 | static struct kobject *connections_kobj; |
| 1016 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1017 | static int fuse_sysfs_init(void) |
| 1018 | { |
| 1019 | int err; |
| 1020 | |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 1021 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1022 | if (!fuse_kobj) { |
| 1023 | err = -ENOMEM; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1024 | goto out_err; |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1025 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1026 | |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1027 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
| 1028 | if (!connections_kobj) { |
| 1029 | err = -ENOMEM; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1030 | goto out_fuse_unregister; |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1031 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1032 | |
| 1033 | return 0; |
| 1034 | |
| 1035 | out_fuse_unregister: |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1036 | kobject_put(fuse_kobj); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1037 | out_err: |
| 1038 | return err; |
| 1039 | } |
| 1040 | |
| 1041 | static void fuse_sysfs_cleanup(void) |
| 1042 | { |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1043 | kobject_put(connections_kobj); |
| 1044 | kobject_put(fuse_kobj); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1045 | } |
| 1046 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1047 | static int __init fuse_init(void) |
| 1048 | { |
| 1049 | int res; |
| 1050 | |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1051 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1052 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
| 1053 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1054 | INIT_LIST_HEAD(&fuse_conn_list); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1055 | res = fuse_fs_init(); |
| 1056 | if (res) |
| 1057 | goto err; |
| 1058 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1059 | res = fuse_dev_init(); |
| 1060 | if (res) |
| 1061 | goto err_fs_cleanup; |
| 1062 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1063 | res = fuse_sysfs_init(); |
| 1064 | if (res) |
| 1065 | goto err_dev_cleanup; |
| 1066 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1067 | res = fuse_ctl_init(); |
| 1068 | if (res) |
| 1069 | goto err_sysfs_cleanup; |
| 1070 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1071 | return 0; |
| 1072 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1073 | err_sysfs_cleanup: |
| 1074 | fuse_sysfs_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1075 | err_dev_cleanup: |
| 1076 | fuse_dev_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1077 | err_fs_cleanup: |
| 1078 | fuse_fs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1079 | err: |
| 1080 | return res; |
| 1081 | } |
| 1082 | |
| 1083 | static void __exit fuse_exit(void) |
| 1084 | { |
| 1085 | printk(KERN_DEBUG "fuse exit\n"); |
| 1086 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1087 | fuse_ctl_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1088 | fuse_sysfs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1089 | fuse_fs_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1090 | fuse_dev_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1091 | } |
| 1092 | |
| 1093 | module_init(fuse_init); |
| 1094 | module_exit(fuse_exit); |