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> |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 17 | #include <linux/moduleparam.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 18 | #include <linux/parser.h> |
| 19 | #include <linux/statfs.h> |
Miklos Szeredi | 9c8ef56 | 2006-06-25 05:48:55 -0700 | [diff] [blame] | 20 | #include <linux/random.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 21 | #include <linux/sched.h> |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 22 | #include <linux/exportfs.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 23 | |
| 24 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); |
| 25 | MODULE_DESCRIPTION("Filesystem in Userspace"); |
| 26 | MODULE_LICENSE("GPL"); |
| 27 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 28 | static struct kmem_cache *fuse_inode_cachep; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 29 | struct list_head fuse_conn_list; |
| 30 | DEFINE_MUTEX(fuse_mutex); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 31 | |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 32 | static int set_global_limit(const char *val, struct kernel_param *kp); |
| 33 | |
Csaba Henk | 79a9d99 | 2009-08-26 19:18:24 +0200 | [diff] [blame] | 34 | unsigned max_user_bgreq; |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 35 | module_param_call(max_user_bgreq, set_global_limit, param_get_uint, |
| 36 | &max_user_bgreq, 0644); |
| 37 | __MODULE_PARM_TYPE(max_user_bgreq, "uint"); |
| 38 | MODULE_PARM_DESC(max_user_bgreq, |
| 39 | "Global limit for the maximum number of backgrounded requests an " |
| 40 | "unprivileged user can set"); |
| 41 | |
Csaba Henk | 79a9d99 | 2009-08-26 19:18:24 +0200 | [diff] [blame] | 42 | unsigned max_user_congthresh; |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 43 | module_param_call(max_user_congthresh, set_global_limit, param_get_uint, |
| 44 | &max_user_congthresh, 0644); |
| 45 | __MODULE_PARM_TYPE(max_user_congthresh, "uint"); |
| 46 | MODULE_PARM_DESC(max_user_congthresh, |
| 47 | "Global limit for the maximum congestion threshold an " |
| 48 | "unprivileged user can set"); |
| 49 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 50 | #define FUSE_SUPER_MAGIC 0x65735546 |
| 51 | |
Miklos Szeredi | d1875db | 2008-02-08 04:21:43 -0800 | [diff] [blame] | 52 | #define FUSE_DEFAULT_BLKSIZE 512 |
| 53 | |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 54 | /** Maximum number of outstanding background requests */ |
| 55 | #define FUSE_DEFAULT_MAX_BACKGROUND 12 |
| 56 | |
| 57 | /** Congestion starts at 75% of maximum */ |
| 58 | #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) |
| 59 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 60 | struct fuse_mount_data { |
| 61 | int fd; |
| 62 | unsigned rootmode; |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 63 | kuid_t user_id; |
| 64 | kgid_t group_id; |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 65 | unsigned fd_present:1; |
| 66 | unsigned rootmode_present:1; |
| 67 | unsigned user_id_present:1; |
| 68 | unsigned group_id_present:1; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 69 | unsigned flags; |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 70 | unsigned max_read; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 71 | unsigned blksize; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 72 | }; |
| 73 | |
Randy Dunlap | a2daff6 | 2011-05-31 14:09:00 -0700 | [diff] [blame] | 74 | struct fuse_forget_link *fuse_alloc_forget(void) |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 75 | { |
| 76 | return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); |
| 77 | } |
| 78 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 79 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
| 80 | { |
| 81 | struct inode *inode; |
| 82 | struct fuse_inode *fi; |
| 83 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 84 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 85 | if (!inode) |
| 86 | return NULL; |
| 87 | |
| 88 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 89 | fi->i_time = 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 90 | fi->nodeid = 0; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 91 | fi->nlookup = 0; |
John Muir | fbee36b | 2007-11-28 16:22:02 -0800 | [diff] [blame] | 92 | fi->attr_version = 0; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 93 | fi->writectr = 0; |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 94 | fi->orig_ino = 0; |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 95 | fi->state = 0; |
Miklos Szeredi | 93a8c3c | 2007-10-18 03:07:03 -0700 | [diff] [blame] | 96 | INIT_LIST_HEAD(&fi->write_files); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 97 | INIT_LIST_HEAD(&fi->queued_writes); |
| 98 | INIT_LIST_HEAD(&fi->writepages); |
| 99 | init_waitqueue_head(&fi->page_waitq); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 100 | fi->forget = fuse_alloc_forget(); |
| 101 | if (!fi->forget) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 102 | kmem_cache_free(fuse_inode_cachep, inode); |
| 103 | return NULL; |
| 104 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 105 | |
| 106 | return inode; |
| 107 | } |
| 108 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 109 | static void fuse_i_callback(struct rcu_head *head) |
| 110 | { |
| 111 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 112 | kmem_cache_free(fuse_inode_cachep, inode); |
| 113 | } |
| 114 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 115 | static void fuse_destroy_inode(struct inode *inode) |
| 116 | { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 117 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 93a8c3c | 2007-10-18 03:07:03 -0700 | [diff] [blame] | 118 | BUG_ON(!list_empty(&fi->write_files)); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 119 | BUG_ON(!list_empty(&fi->queued_writes)); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 120 | kfree(fi->forget); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 121 | call_rcu(&inode->i_rcu, fuse_i_callback); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 124 | static void fuse_evict_inode(struct inode *inode) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 125 | { |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 126 | truncate_inode_pages_final(&inode->i_data); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 127 | clear_inode(inode); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 128 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
| 129 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 131 | fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); |
| 132 | fi->forget = NULL; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 133 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 136 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
| 137 | { |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 138 | sync_filesystem(sb); |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 139 | if (*flags & MS_MANDLOCK) |
| 140 | return -EINVAL; |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 145 | /* |
| 146 | * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down |
| 147 | * so that it will fit. |
| 148 | */ |
| 149 | static ino_t fuse_squash_ino(u64 ino64) |
| 150 | { |
| 151 | ino_t ino = (ino_t) ino64; |
| 152 | if (sizeof(ino_t) < sizeof(u64)) |
| 153 | ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; |
| 154 | return ino; |
| 155 | } |
| 156 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 157 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
| 158 | u64 attr_valid) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 159 | { |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 160 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 161 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 162 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 163 | fi->attr_version = ++fc->attr_version; |
| 164 | fi->i_time = attr_valid; |
| 165 | |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 166 | inode->i_ino = fuse_squash_ino(attr->ino); |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 167 | inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 168 | set_nlink(inode, attr->nlink); |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 169 | inode->i_uid = make_kuid(&init_user_ns, attr->uid); |
| 170 | inode->i_gid = make_kgid(&init_user_ns, attr->gid); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 171 | inode->i_blocks = attr->blocks; |
| 172 | inode->i_atime.tv_sec = attr->atime; |
| 173 | inode->i_atime.tv_nsec = attr->atimensec; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 174 | /* mtime from server may be stale due to local buffered write */ |
| 175 | if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { |
| 176 | inode->i_mtime.tv_sec = attr->mtime; |
| 177 | inode->i_mtime.tv_nsec = attr->mtimensec; |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 178 | inode->i_ctime.tv_sec = attr->ctime; |
| 179 | inode->i_ctime.tv_nsec = attr->ctimensec; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 180 | } |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 181 | |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 182 | if (attr->blksize != 0) |
| 183 | inode->i_blkbits = ilog2(attr->blksize); |
| 184 | else |
| 185 | inode->i_blkbits = inode->i_sb->s_blocksize_bits; |
| 186 | |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 187 | /* |
| 188 | * Don't set the sticky bit in i_mode, unless we want the VFS |
| 189 | * to check permissions. This prevents failures due to the |
| 190 | * check in may_delete(). |
| 191 | */ |
| 192 | fi->orig_i_mode = inode->i_mode; |
| 193 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
| 194 | inode->i_mode &= ~S_ISVTX; |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 195 | |
| 196 | fi->orig_ino = attr->ino; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
| 200 | u64 attr_valid, u64 attr_version) |
| 201 | { |
| 202 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 203 | struct fuse_inode *fi = get_fuse_inode(inode); |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 204 | bool is_wb = fc->writeback_cache; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 205 | loff_t oldsize; |
Brian Foster | eed2179 | 2012-07-16 15:23:49 -0400 | [diff] [blame] | 206 | struct timespec old_mtime; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 207 | |
| 208 | spin_lock(&fc->lock); |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 209 | if ((attr_version != 0 && fi->attr_version > attr_version) || |
| 210 | test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 211 | spin_unlock(&fc->lock); |
| 212 | return; |
| 213 | } |
| 214 | |
Brian Foster | eed2179 | 2012-07-16 15:23:49 -0400 | [diff] [blame] | 215 | old_mtime = inode->i_mtime; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 216 | fuse_change_attributes_common(inode, attr, attr_valid); |
Miklos Szeredi | ebc14c4 | 2007-10-16 23:31:03 -0700 | [diff] [blame] | 217 | |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 218 | oldsize = inode->i_size; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 219 | /* |
| 220 | * In case of writeback_cache enabled, the cached writes beyond EOF |
| 221 | * extend local i_size without keeping userspace server in sync. So, |
| 222 | * attr->size coming from server can be stale. We cannot trust it. |
| 223 | */ |
| 224 | if (!is_wb || !S_ISREG(inode->i_mode)) |
| 225 | i_size_write(inode, attr->size); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 226 | spin_unlock(&fc->lock); |
| 227 | |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 228 | if (!is_wb && S_ISREG(inode->i_mode)) { |
Brian Foster | eed2179 | 2012-07-16 15:23:49 -0400 | [diff] [blame] | 229 | bool inval = false; |
| 230 | |
| 231 | if (oldsize != attr->size) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 232 | truncate_pagecache(inode, attr->size); |
Brian Foster | eed2179 | 2012-07-16 15:23:49 -0400 | [diff] [blame] | 233 | inval = true; |
| 234 | } else if (fc->auto_inval_data) { |
| 235 | struct timespec new_mtime = { |
| 236 | .tv_sec = attr->mtime, |
| 237 | .tv_nsec = attr->mtimensec, |
| 238 | }; |
| 239 | |
| 240 | /* |
| 241 | * Auto inval mode also checks and invalidates if mtime |
| 242 | * has changed. |
| 243 | */ |
| 244 | if (!timespec_equal(&old_mtime, &new_mtime)) |
| 245 | inval = true; |
| 246 | } |
| 247 | |
| 248 | if (inval) |
| 249 | invalidate_inode_pages2(inode->i_mapping); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 250 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) |
| 254 | { |
| 255 | inode->i_mode = attr->mode & S_IFMT; |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 256 | inode->i_size = attr->size; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 257 | inode->i_mtime.tv_sec = attr->mtime; |
| 258 | inode->i_mtime.tv_nsec = attr->mtimensec; |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 259 | inode->i_ctime.tv_sec = attr->ctime; |
| 260 | inode->i_ctime.tv_nsec = attr->ctimensec; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 261 | if (S_ISREG(inode->i_mode)) { |
| 262 | fuse_init_common(inode); |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 263 | fuse_init_file_inode(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 264 | } else if (S_ISDIR(inode->i_mode)) |
| 265 | fuse_init_dir(inode); |
| 266 | else if (S_ISLNK(inode->i_mode)) |
| 267 | fuse_init_symlink(inode); |
| 268 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
| 269 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { |
| 270 | fuse_init_common(inode); |
| 271 | init_special_inode(inode, inode->i_mode, |
| 272 | new_decode_dev(attr->rdev)); |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 273 | } else |
| 274 | BUG(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 275 | } |
| 276 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 277 | int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 278 | { |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 279 | u64 nodeid = *(u64 *) _nodeidp; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 280 | if (get_node_id(inode) == nodeid) |
| 281 | return 1; |
| 282 | else |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) |
| 287 | { |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 288 | u64 nodeid = *(u64 *) _nodeidp; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 289 | get_fuse_inode(inode)->nodeid = nodeid; |
| 290 | return 0; |
| 291 | } |
| 292 | |
Miklos Szeredi | b48badf | 2008-04-30 00:54:44 -0700 | [diff] [blame] | 293 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 294 | int generation, struct fuse_attr *attr, |
| 295 | u64 attr_valid, u64 attr_version) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 296 | { |
| 297 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 298 | struct fuse_inode *fi; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 299 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 300 | |
| 301 | retry: |
| 302 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
| 303 | if (!inode) |
| 304 | return NULL; |
| 305 | |
| 306 | if ((inode->i_state & I_NEW)) { |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 307 | inode->i_flags |= S_NOATIME; |
Maxim Patlasov | d31433c | 2014-04-28 14:19:21 +0200 | [diff] [blame] | 308 | if (!fc->writeback_cache || !S_ISREG(attr->mode)) |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 309 | inode->i_flags |= S_NOCMTIME; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 310 | inode->i_generation = generation; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 311 | fuse_init_inode(inode, attr); |
| 312 | unlock_new_inode(inode); |
| 313 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 314 | /* Inode has changed type, any I/O on the old should fail */ |
| 315 | make_bad_inode(inode); |
| 316 | iput(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 317 | goto retry; |
| 318 | } |
| 319 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 320 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 321 | spin_lock(&fc->lock); |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 322 | fi->nlookup++; |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 323 | spin_unlock(&fc->lock); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 324 | fuse_change_attributes(inode, attr, attr_valid, attr_version); |
| 325 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 326 | return inode; |
| 327 | } |
| 328 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 329 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
| 330 | loff_t offset, loff_t len) |
| 331 | { |
| 332 | struct inode *inode; |
| 333 | pgoff_t pg_start; |
| 334 | pgoff_t pg_end; |
| 335 | |
| 336 | inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); |
| 337 | if (!inode) |
| 338 | return -ENOENT; |
| 339 | |
| 340 | fuse_invalidate_attr(inode); |
| 341 | if (offset >= 0) { |
| 342 | pg_start = offset >> PAGE_CACHE_SHIFT; |
| 343 | if (len <= 0) |
| 344 | pg_end = -1; |
| 345 | else |
| 346 | pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT; |
| 347 | invalidate_inode_pages2_range(inode->i_mapping, |
| 348 | pg_start, pg_end); |
| 349 | } |
| 350 | iput(inode); |
| 351 | return 0; |
| 352 | } |
| 353 | |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 354 | static void fuse_umount_begin(struct super_block *sb) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 355 | { |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 356 | fuse_abort_conn(get_fuse_conn_super(sb)); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 357 | } |
| 358 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 359 | static void fuse_send_destroy(struct fuse_conn *fc) |
| 360 | { |
| 361 | struct fuse_req *req = fc->destroy_req; |
| 362 | if (req && fc->conn_init) { |
| 363 | fc->destroy_req = NULL; |
| 364 | req->in.h.opcode = FUSE_DESTROY; |
| 365 | req->force = 1; |
Maxim Patlasov | 8b41e67 | 2013-03-21 18:02:04 +0400 | [diff] [blame] | 366 | req->background = 0; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 367 | fuse_request_send(fc, req); |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 368 | fuse_put_request(fc, req); |
| 369 | } |
| 370 | } |
| 371 | |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 372 | static void fuse_bdi_destroy(struct fuse_conn *fc) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 373 | { |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 374 | if (fc->bdi_initialized) |
| 375 | bdi_destroy(&fc->bdi); |
| 376 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 377 | |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 378 | static void fuse_put_super(struct super_block *sb) |
| 379 | { |
| 380 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 381 | |
| 382 | fuse_send_destroy(fc); |
Miklos Szeredi | bbd9979 | 2012-08-30 19:24:34 +0200 | [diff] [blame] | 383 | |
Miklos Szeredi | 580640b | 2014-12-12 09:49:04 +0100 | [diff] [blame] | 384 | fuse_abort_conn(fc); |
Miklos Szeredi | bbd9979 | 2012-08-30 19:24:34 +0200 | [diff] [blame] | 385 | mutex_lock(&fuse_mutex); |
| 386 | list_del(&fc->entry); |
| 387 | fuse_ctl_remove_conn(fc); |
| 388 | mutex_unlock(&fuse_mutex); |
| 389 | fuse_bdi_destroy(fc); |
| 390 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 391 | fuse_conn_put(fc); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 394 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
| 395 | { |
| 396 | stbuf->f_type = FUSE_SUPER_MAGIC; |
| 397 | stbuf->f_bsize = attr->bsize; |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 398 | stbuf->f_frsize = attr->frsize; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 399 | stbuf->f_blocks = attr->blocks; |
| 400 | stbuf->f_bfree = attr->bfree; |
| 401 | stbuf->f_bavail = attr->bavail; |
| 402 | stbuf->f_files = attr->files; |
| 403 | stbuf->f_ffree = attr->ffree; |
| 404 | stbuf->f_namelen = attr->namelen; |
| 405 | /* fsid is left zero */ |
| 406 | } |
| 407 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 408 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 409 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 410 | struct super_block *sb = dentry->d_sb; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 411 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 412 | FUSE_ARGS(args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 413 | struct fuse_statfs_out outarg; |
| 414 | int err; |
| 415 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 416 | if (!fuse_allow_current_process(fc)) { |
Miklos Szeredi | e57ac68 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 417 | buf->f_type = FUSE_SUPER_MAGIC; |
| 418 | return 0; |
| 419 | } |
| 420 | |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 421 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 422 | args.in.numargs = 0; |
| 423 | args.in.h.opcode = FUSE_STATFS; |
| 424 | args.in.h.nodeid = get_node_id(dentry->d_inode); |
| 425 | args.out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 426 | args.out.args[0].size = sizeof(outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 427 | args.out.args[0].value = &outarg; |
| 428 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 429 | if (!err) |
| 430 | convert_fuse_statfs(buf, &outarg.st); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 431 | return err; |
| 432 | } |
| 433 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 434 | enum { |
| 435 | OPT_FD, |
| 436 | OPT_ROOTMODE, |
| 437 | OPT_USER_ID, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 438 | OPT_GROUP_ID, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 439 | OPT_DEFAULT_PERMISSIONS, |
| 440 | OPT_ALLOW_OTHER, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 441 | OPT_MAX_READ, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 442 | OPT_BLKSIZE, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 443 | OPT_ERR |
| 444 | }; |
| 445 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 446 | static const match_table_t tokens = { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 447 | {OPT_FD, "fd=%u"}, |
| 448 | {OPT_ROOTMODE, "rootmode=%o"}, |
| 449 | {OPT_USER_ID, "user_id=%u"}, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 450 | {OPT_GROUP_ID, "group_id=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 451 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
| 452 | {OPT_ALLOW_OTHER, "allow_other"}, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 453 | {OPT_MAX_READ, "max_read=%u"}, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 454 | {OPT_BLKSIZE, "blksize=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 455 | {OPT_ERR, NULL} |
| 456 | }; |
| 457 | |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 458 | static int fuse_match_uint(substring_t *s, unsigned int *res) |
| 459 | { |
| 460 | int err = -ENOMEM; |
| 461 | char *buf = match_strdup(s); |
| 462 | if (buf) { |
| 463 | err = kstrtouint(buf, 10, res); |
| 464 | kfree(buf); |
| 465 | } |
| 466 | return err; |
| 467 | } |
| 468 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 469 | 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] | 470 | { |
| 471 | char *p; |
| 472 | memset(d, 0, sizeof(struct fuse_mount_data)); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 473 | d->max_read = ~0; |
Miklos Szeredi | d1875db | 2008-02-08 04:21:43 -0800 | [diff] [blame] | 474 | d->blksize = FUSE_DEFAULT_BLKSIZE; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 475 | |
| 476 | while ((p = strsep(&opt, ",")) != NULL) { |
| 477 | int token; |
| 478 | int value; |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 479 | unsigned uv; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 480 | substring_t args[MAX_OPT_ARGS]; |
| 481 | if (!*p) |
| 482 | continue; |
| 483 | |
| 484 | token = match_token(p, tokens, args); |
| 485 | switch (token) { |
| 486 | case OPT_FD: |
| 487 | if (match_int(&args[0], &value)) |
| 488 | return 0; |
| 489 | d->fd = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 490 | d->fd_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 491 | break; |
| 492 | |
| 493 | case OPT_ROOTMODE: |
| 494 | if (match_octal(&args[0], &value)) |
| 495 | return 0; |
Timo Savola | a5bfffac | 2007-04-08 16:04:00 -0700 | [diff] [blame] | 496 | if (!fuse_valid_type(value)) |
| 497 | return 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 498 | d->rootmode = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 499 | d->rootmode_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 500 | break; |
| 501 | |
| 502 | case OPT_USER_ID: |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 503 | if (fuse_match_uint(&args[0], &uv)) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 504 | return 0; |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 505 | d->user_id = make_kuid(current_user_ns(), uv); |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 506 | if (!uid_valid(d->user_id)) |
| 507 | return 0; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 508 | d->user_id_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 509 | break; |
| 510 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 511 | case OPT_GROUP_ID: |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 512 | if (fuse_match_uint(&args[0], &uv)) |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 513 | return 0; |
Miklos Szeredi | 233a01f | 2014-07-07 15:28:51 +0200 | [diff] [blame] | 514 | d->group_id = make_kgid(current_user_ns(), uv); |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 515 | if (!gid_valid(d->group_id)) |
| 516 | return 0; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 517 | d->group_id_present = 1; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 518 | break; |
| 519 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 520 | case OPT_DEFAULT_PERMISSIONS: |
| 521 | d->flags |= FUSE_DEFAULT_PERMISSIONS; |
| 522 | break; |
| 523 | |
| 524 | case OPT_ALLOW_OTHER: |
| 525 | d->flags |= FUSE_ALLOW_OTHER; |
| 526 | break; |
| 527 | |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 528 | case OPT_MAX_READ: |
| 529 | if (match_int(&args[0], &value)) |
| 530 | return 0; |
| 531 | d->max_read = value; |
| 532 | break; |
| 533 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 534 | case OPT_BLKSIZE: |
| 535 | if (!is_bdev || match_int(&args[0], &value)) |
| 536 | return 0; |
| 537 | d->blksize = value; |
| 538 | break; |
| 539 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 540 | default: |
| 541 | return 0; |
| 542 | } |
| 543 | } |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 544 | |
| 545 | if (!d->fd_present || !d->rootmode_present || |
| 546 | !d->user_id_present || !d->group_id_present) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 547 | return 0; |
| 548 | |
| 549 | return 1; |
| 550 | } |
| 551 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 552 | static int fuse_show_options(struct seq_file *m, struct dentry *root) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 553 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 554 | struct super_block *sb = root->d_sb; |
| 555 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 556 | |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 557 | seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); |
| 558 | seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 559 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
| 560 | seq_puts(m, ",default_permissions"); |
| 561 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 562 | seq_puts(m, ",allow_other"); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 563 | if (fc->max_read != ~0) |
| 564 | seq_printf(m, ",max_read=%u", fc->max_read); |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 565 | if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) |
| 566 | seq_printf(m, ",blksize=%lu", sb->s_blocksize); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 567 | return 0; |
| 568 | } |
| 569 | |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 570 | void fuse_conn_init(struct fuse_conn *fc) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 571 | { |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 572 | memset(fc, 0, sizeof(*fc)); |
| 573 | spin_lock_init(&fc->lock); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 574 | init_rwsem(&fc->killsb); |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 575 | atomic_set(&fc->count, 1); |
| 576 | init_waitqueue_head(&fc->waitq); |
| 577 | init_waitqueue_head(&fc->blocked_waitq); |
| 578 | init_waitqueue_head(&fc->reserved_req_waitq); |
| 579 | INIT_LIST_HEAD(&fc->pending); |
| 580 | INIT_LIST_HEAD(&fc->processing); |
| 581 | INIT_LIST_HEAD(&fc->io); |
| 582 | INIT_LIST_HEAD(&fc->interrupts); |
| 583 | INIT_LIST_HEAD(&fc->bg_queue); |
| 584 | INIT_LIST_HEAD(&fc->entry); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 585 | fc->forget_list_tail = &fc->forget_list_head; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 586 | atomic_set(&fc->num_waiting, 0); |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 587 | fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; |
| 588 | fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 589 | fc->khctr = 0; |
| 590 | fc->polled_files = RB_ROOT; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 591 | fc->reqctr = 0; |
Maxim Patlasov | 0aada88 | 2013-03-21 18:02:28 +0400 | [diff] [blame] | 592 | fc->blocked = 0; |
Maxim Patlasov | 796523fb | 2013-03-21 18:02:15 +0400 | [diff] [blame] | 593 | fc->initialized = 0; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 594 | fc->attr_version = 1; |
| 595 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 596 | } |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 597 | EXPORT_SYMBOL_GPL(fuse_conn_init); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 598 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 599 | void fuse_conn_put(struct fuse_conn *fc) |
| 600 | { |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 601 | if (atomic_dec_and_test(&fc->count)) { |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 602 | if (fc->destroy_req) |
| 603 | fuse_request_free(fc->destroy_req); |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 604 | fc->release(fc); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 605 | } |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 606 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 607 | EXPORT_SYMBOL_GPL(fuse_conn_put); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 608 | |
| 609 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) |
| 610 | { |
| 611 | atomic_inc(&fc->count); |
| 612 | return fc; |
| 613 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 614 | EXPORT_SYMBOL_GPL(fuse_conn_get); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 615 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 616 | 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] | 617 | { |
| 618 | struct fuse_attr attr; |
| 619 | memset(&attr, 0, sizeof(attr)); |
| 620 | |
| 621 | attr.mode = mode; |
| 622 | attr.ino = FUSE_ROOT_ID; |
Miklos Szeredi | 074406f | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 623 | attr.nlink = 1; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 624 | return fuse_iget(sb, 1, 0, &attr, 0, 0); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 627 | struct fuse_inode_handle { |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 628 | u64 nodeid; |
| 629 | u32 generation; |
| 630 | }; |
| 631 | |
| 632 | static struct dentry *fuse_get_dentry(struct super_block *sb, |
| 633 | struct fuse_inode_handle *handle) |
| 634 | { |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 635 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 636 | struct inode *inode; |
| 637 | struct dentry *entry; |
| 638 | int err = -ESTALE; |
| 639 | |
| 640 | if (handle->nodeid == 0) |
| 641 | goto out_err; |
| 642 | |
| 643 | inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 644 | if (!inode) { |
| 645 | struct fuse_entry_out outarg; |
| 646 | struct qstr name; |
| 647 | |
| 648 | if (!fc->export_support) |
| 649 | goto out_err; |
| 650 | |
| 651 | name.len = 1; |
| 652 | name.name = "."; |
| 653 | err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, |
| 654 | &inode); |
| 655 | if (err && err != -ENOENT) |
| 656 | goto out_err; |
| 657 | if (err || !inode) { |
| 658 | err = -ESTALE; |
| 659 | goto out_err; |
| 660 | } |
| 661 | err = -EIO; |
| 662 | if (get_node_id(inode) != handle->nodeid) |
| 663 | goto out_iput; |
| 664 | } |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 665 | err = -ESTALE; |
| 666 | if (inode->i_generation != handle->generation) |
| 667 | goto out_iput; |
| 668 | |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 669 | entry = d_obtain_alias(inode); |
Al Viro | c35eebe | 2010-12-18 11:15:22 -0500 | [diff] [blame] | 670 | if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 671 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 672 | |
| 673 | return entry; |
| 674 | |
| 675 | out_iput: |
| 676 | iput(inode); |
| 677 | out_err: |
| 678 | return ERR_PTR(err); |
| 679 | } |
| 680 | |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 681 | static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, |
| 682 | struct inode *parent) |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 683 | { |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 684 | int len = parent ? 6 : 3; |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 685 | u64 nodeid; |
| 686 | u32 generation; |
| 687 | |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 688 | if (*max_len < len) { |
| 689 | *max_len = len; |
Namjae Jeon | 94e07a75 | 2013-02-17 15:48:11 +0900 | [diff] [blame] | 690 | return FILEID_INVALID; |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 691 | } |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 692 | |
| 693 | nodeid = get_fuse_inode(inode)->nodeid; |
| 694 | generation = inode->i_generation; |
| 695 | |
| 696 | fh[0] = (u32)(nodeid >> 32); |
| 697 | fh[1] = (u32)(nodeid & 0xffffffff); |
| 698 | fh[2] = generation; |
| 699 | |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 700 | if (parent) { |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 701 | nodeid = get_fuse_inode(parent)->nodeid; |
| 702 | generation = parent->i_generation; |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 703 | |
| 704 | fh[3] = (u32)(nodeid >> 32); |
| 705 | fh[4] = (u32)(nodeid & 0xffffffff); |
| 706 | fh[5] = generation; |
| 707 | } |
| 708 | |
| 709 | *max_len = len; |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 710 | return parent ? 0x82 : 0x81; |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | static struct dentry *fuse_fh_to_dentry(struct super_block *sb, |
| 714 | struct fid *fid, int fh_len, int fh_type) |
| 715 | { |
| 716 | struct fuse_inode_handle handle; |
| 717 | |
| 718 | if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) |
| 719 | return NULL; |
| 720 | |
| 721 | handle.nodeid = (u64) fid->raw[0] << 32; |
| 722 | handle.nodeid |= (u64) fid->raw[1]; |
| 723 | handle.generation = fid->raw[2]; |
| 724 | return fuse_get_dentry(sb, &handle); |
| 725 | } |
| 726 | |
| 727 | static struct dentry *fuse_fh_to_parent(struct super_block *sb, |
| 728 | struct fid *fid, int fh_len, int fh_type) |
| 729 | { |
| 730 | struct fuse_inode_handle parent; |
| 731 | |
| 732 | if (fh_type != 0x82 || fh_len < 6) |
| 733 | return NULL; |
| 734 | |
| 735 | parent.nodeid = (u64) fid->raw[3] << 32; |
| 736 | parent.nodeid |= (u64) fid->raw[4]; |
| 737 | parent.generation = fid->raw[5]; |
| 738 | return fuse_get_dentry(sb, &parent); |
| 739 | } |
| 740 | |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 741 | static struct dentry *fuse_get_parent(struct dentry *child) |
| 742 | { |
| 743 | struct inode *child_inode = child->d_inode; |
| 744 | struct fuse_conn *fc = get_fuse_conn(child_inode); |
| 745 | struct inode *inode; |
| 746 | struct dentry *parent; |
| 747 | struct fuse_entry_out outarg; |
| 748 | struct qstr name; |
| 749 | int err; |
| 750 | |
| 751 | if (!fc->export_support) |
| 752 | return ERR_PTR(-ESTALE); |
| 753 | |
| 754 | name.len = 2; |
| 755 | name.name = ".."; |
| 756 | err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), |
| 757 | &name, &outarg, &inode); |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 758 | if (err) { |
| 759 | if (err == -ENOENT) |
| 760 | return ERR_PTR(-ESTALE); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 761 | return ERR_PTR(err); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 762 | } |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 763 | |
| 764 | parent = d_obtain_alias(inode); |
Al Viro | c35eebe | 2010-12-18 11:15:22 -0500 | [diff] [blame] | 765 | if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 766 | fuse_invalidate_entry_cache(parent); |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 767 | |
| 768 | return parent; |
| 769 | } |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 770 | |
| 771 | static const struct export_operations fuse_export_operations = { |
| 772 | .fh_to_dentry = fuse_fh_to_dentry, |
| 773 | .fh_to_parent = fuse_fh_to_parent, |
| 774 | .encode_fh = fuse_encode_fh, |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 775 | .get_parent = fuse_get_parent, |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 776 | }; |
| 777 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 778 | static const struct super_operations fuse_super_operations = { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 779 | .alloc_inode = fuse_alloc_inode, |
| 780 | .destroy_inode = fuse_destroy_inode, |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 781 | .evict_inode = fuse_evict_inode, |
Miklos Szeredi | 1e18bda | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 782 | .write_inode = fuse_write_inode, |
Miklos Szeredi | ead5f0b | 2007-05-23 13:57:54 -0700 | [diff] [blame] | 783 | .drop_inode = generic_delete_inode, |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 784 | .remount_fs = fuse_remount_fs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 785 | .put_super = fuse_put_super, |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 786 | .umount_begin = fuse_umount_begin, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 787 | .statfs = fuse_statfs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 788 | .show_options = fuse_show_options, |
| 789 | }; |
| 790 | |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 791 | static void sanitize_global_limit(unsigned *limit) |
| 792 | { |
| 793 | if (*limit == 0) |
Jiang Liu | 0ed5fd1 | 2013-07-03 15:03:43 -0700 | [diff] [blame] | 794 | *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 795 | sizeof(struct fuse_req); |
| 796 | |
| 797 | if (*limit >= 1 << 16) |
| 798 | *limit = (1 << 16) - 1; |
| 799 | } |
| 800 | |
| 801 | static int set_global_limit(const char *val, struct kernel_param *kp) |
| 802 | { |
| 803 | int rv; |
| 804 | |
| 805 | rv = param_set_uint(val, kp); |
| 806 | if (rv) |
| 807 | return rv; |
| 808 | |
| 809 | sanitize_global_limit((unsigned *)kp->arg); |
| 810 | |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) |
| 815 | { |
| 816 | int cap_sys_admin = capable(CAP_SYS_ADMIN); |
| 817 | |
| 818 | if (arg->minor < 13) |
| 819 | return; |
| 820 | |
| 821 | sanitize_global_limit(&max_user_bgreq); |
| 822 | sanitize_global_limit(&max_user_congthresh); |
| 823 | |
| 824 | if (arg->max_background) { |
| 825 | fc->max_background = arg->max_background; |
| 826 | |
| 827 | if (!cap_sys_admin && fc->max_background > max_user_bgreq) |
| 828 | fc->max_background = max_user_bgreq; |
| 829 | } |
| 830 | if (arg->congestion_threshold) { |
| 831 | fc->congestion_threshold = arg->congestion_threshold; |
| 832 | |
| 833 | if (!cap_sys_admin && |
| 834 | fc->congestion_threshold > max_user_congthresh) |
| 835 | fc->congestion_threshold = max_user_congthresh; |
| 836 | } |
| 837 | } |
| 838 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 839 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
| 840 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 841 | struct fuse_init_out *arg = &req->misc.init_out; |
| 842 | |
| 843 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) |
| 844 | fc->conn_error = 1; |
| 845 | else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 846 | unsigned long ra_pages; |
| 847 | |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 848 | process_init_limits(fc, arg); |
| 849 | |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 850 | if (arg->minor >= 6) { |
| 851 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; |
| 852 | if (arg->flags & FUSE_ASYNC_READ) |
| 853 | fc->async_read = 1; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 854 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
| 855 | fc->no_lock = 1; |
Miklos Szeredi | 37fb3a3 | 2011-08-08 16:08:08 +0200 | [diff] [blame] | 856 | if (arg->minor >= 17) { |
| 857 | if (!(arg->flags & FUSE_FLOCK_LOCKS)) |
| 858 | fc->no_flock = 1; |
Miklos Szeredi | 2411450 | 2011-09-12 09:31:49 +0200 | [diff] [blame] | 859 | } else { |
| 860 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
| 861 | fc->no_flock = 1; |
Miklos Szeredi | 37fb3a3 | 2011-08-08 16:08:08 +0200 | [diff] [blame] | 862 | } |
Miklos Szeredi | 6ff958e | 2007-10-18 03:07:02 -0700 | [diff] [blame] | 863 | if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
| 864 | fc->atomic_o_trunc = 1; |
Miklos Szeredi | 33670fa | 2008-07-25 01:49:02 -0700 | [diff] [blame] | 865 | if (arg->minor >= 9) { |
| 866 | /* LOOKUP has dependency on proto version */ |
| 867 | if (arg->flags & FUSE_EXPORT_SUPPORT) |
| 868 | fc->export_support = 1; |
| 869 | } |
Miklos Szeredi | 78bb6cb | 2008-05-12 14:02:32 -0700 | [diff] [blame] | 870 | if (arg->flags & FUSE_BIG_WRITES) |
| 871 | fc->big_writes = 1; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 872 | if (arg->flags & FUSE_DONT_MASK) |
| 873 | fc->dont_mask = 1; |
Brian Foster | 72d0d24 | 2012-07-16 15:23:48 -0400 | [diff] [blame] | 874 | if (arg->flags & FUSE_AUTO_INVAL_DATA) |
| 875 | fc->auto_inval_data = 1; |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 876 | if (arg->flags & FUSE_DO_READDIRPLUS) { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 877 | fc->do_readdirplus = 1; |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 878 | if (arg->flags & FUSE_READDIRPLUS_AUTO) |
| 879 | fc->readdirplus_auto = 1; |
| 880 | } |
Miklos Szeredi | 60b9df7 | 2013-05-01 14:37:21 +0200 | [diff] [blame] | 881 | if (arg->flags & FUSE_ASYNC_DIO) |
| 882 | fc->async_dio = 1; |
Pavel Emelyanov | 4d99ff8 | 2013-10-10 17:12:18 +0400 | [diff] [blame] | 883 | if (arg->flags & FUSE_WRITEBACK_CACHE) |
| 884 | fc->writeback_cache = 1; |
Miklos Szeredi | e27c9d3 | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 885 | if (arg->time_gran && arg->time_gran <= 1000000000) |
| 886 | fc->sb->s_time_gran = arg->time_gran; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 887 | } else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 888 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 889 | fc->no_lock = 1; |
Miklos Szeredi | 37fb3a3 | 2011-08-08 16:08:08 +0200 | [diff] [blame] | 890 | fc->no_flock = 1; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 891 | } |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 892 | |
| 893 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 894 | fc->minor = arg->minor; |
| 895 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; |
Miklos Szeredi | f948d56 | 2008-06-17 18:05:40 +0200 | [diff] [blame] | 896 | fc->max_write = max_t(unsigned, 4096, fc->max_write); |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 897 | fc->conn_init = 1; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 898 | } |
Miklos Szeredi | 9759bd51 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 899 | fuse_set_initialized(fc); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 900 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 901 | } |
| 902 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 903 | 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] | 904 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 905 | struct fuse_init_in *arg = &req->misc.init_in; |
Miklos Szeredi | 095da6c | 2006-01-16 22:14:52 -0800 | [diff] [blame] | 906 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 907 | arg->major = FUSE_KERNEL_VERSION; |
| 908 | arg->minor = FUSE_KERNEL_MINOR_VERSION; |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 909 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
Miklos Szeredi | 78bb6cb | 2008-05-12 14:02:32 -0700 | [diff] [blame] | 910 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | |
Miklos Szeredi | 37fb3a3 | 2011-08-08 16:08:08 +0200 | [diff] [blame] | 911 | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | |
Miklos Szeredi | 69fe05c | 2012-07-18 16:09:40 +0200 | [diff] [blame] | 912 | FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 913 | FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | |
Pavel Emelyanov | 4d99ff8 | 2013-10-10 17:12:18 +0400 | [diff] [blame] | 914 | FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | |
Andrew Gallagher | d7afaec | 2014-07-22 16:37:43 +0200 | [diff] [blame] | 915 | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 916 | req->in.h.opcode = FUSE_INIT; |
| 917 | req->in.numargs = 1; |
| 918 | req->in.args[0].size = sizeof(*arg); |
| 919 | req->in.args[0].value = arg; |
| 920 | req->out.numargs = 1; |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 921 | /* Variable length argument used for backward compatibility |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 922 | with interface version < 7.5. Rest of init_out is zeroed |
| 923 | by do_get_request(), so a short reply is not a problem */ |
| 924 | req->out.argvar = 1; |
| 925 | req->out.args[0].size = sizeof(struct fuse_init_out); |
| 926 | req->out.args[0].value = &req->misc.init_out; |
| 927 | req->end = process_init_reply; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 928 | fuse_request_send_background(fc, req); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 929 | } |
| 930 | |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 931 | static void fuse_free_conn(struct fuse_conn *fc) |
| 932 | { |
Al Viro | dd3e2c5 | 2013-10-03 21:21:39 -0400 | [diff] [blame] | 933 | kfree_rcu(fc, rcu); |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 934 | } |
| 935 | |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 936 | static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) |
| 937 | { |
| 938 | int err; |
| 939 | |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 940 | fc->bdi.name = "fuse"; |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 941 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 942 | /* fuse does it's own writeback accounting */ |
Maxim Patlasov | 5a53748 | 2013-09-11 14:22:46 -0700 | [diff] [blame] | 943 | fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 944 | |
| 945 | err = bdi_init(&fc->bdi); |
| 946 | if (err) |
| 947 | return err; |
| 948 | |
| 949 | fc->bdi_initialized = 1; |
| 950 | |
| 951 | if (sb->s_bdev) { |
| 952 | err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", |
| 953 | MAJOR(fc->dev), MINOR(fc->dev)); |
| 954 | } else { |
| 955 | err = bdi_register_dev(&fc->bdi, fc->dev); |
| 956 | } |
| 957 | |
| 958 | if (err) |
| 959 | return err; |
| 960 | |
| 961 | /* |
| 962 | * For a single fuse filesystem use max 1% of dirty + |
| 963 | * writeback threshold. |
| 964 | * |
| 965 | * This gives about 1M of write buffer for memory maps on a |
| 966 | * machine with 1G and 10% dirty_ratio, which should be more |
| 967 | * than enough. |
| 968 | * |
| 969 | * Privileged users can raise it by writing to |
| 970 | * |
| 971 | * /sys/class/bdi/<bdi>/max_ratio |
| 972 | */ |
| 973 | bdi_set_max_ratio(&fc->bdi, 1); |
| 974 | |
| 975 | return 0; |
| 976 | } |
| 977 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 978 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
| 979 | { |
| 980 | struct fuse_conn *fc; |
| 981 | struct inode *root; |
| 982 | struct fuse_mount_data d; |
| 983 | struct file *file; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 984 | struct dentry *root_dentry; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 985 | struct fuse_req *init_req; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 986 | int err; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 987 | int is_bdev = sb->s_bdev != NULL; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 988 | |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 989 | err = -EINVAL; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 990 | if (sb->s_flags & MS_MANDLOCK) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 991 | goto err; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 992 | |
Miklos Szeredi | 4ace1f8 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 993 | sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 994 | |
Himangi Saraogi | 7b3d8bf | 2014-06-26 23:06:52 +0530 | [diff] [blame] | 995 | if (!parse_fuse_opt(data, &d, is_bdev)) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 996 | goto err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 997 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 998 | if (is_bdev) { |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 999 | #ifdef CONFIG_BLOCK |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1000 | err = -EINVAL; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 1001 | if (!sb_set_blocksize(sb, d.blksize)) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1002 | goto err; |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1003 | #endif |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 1004 | } else { |
| 1005 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 1006 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 1007 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1008 | sb->s_magic = FUSE_SUPER_MAGIC; |
| 1009 | sb->s_op = &fuse_super_operations; |
| 1010 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Miklos Szeredi | 0a2da9b | 2012-04-11 11:45:06 +0200 | [diff] [blame] | 1011 | sb->s_time_gran = 1; |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 1012 | sb->s_export_op = &fuse_export_operations; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1013 | |
| 1014 | file = fget(d.fd); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1015 | err = -EINVAL; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1016 | if (!file) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1017 | goto err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1018 | |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1019 | if ((file->f_op != &fuse_dev_operations) || |
| 1020 | (file->f_cred->user_ns != &init_user_ns)) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1021 | goto err_fput; |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1022 | |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1023 | fc = kmalloc(sizeof(*fc), GFP_KERNEL); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1024 | err = -ENOMEM; |
| 1025 | if (!fc) |
| 1026 | goto err_fput; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1027 | |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 1028 | fuse_conn_init(fc); |
| 1029 | |
| 1030 | fc->dev = sb->s_dev; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1031 | fc->sb = sb; |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 1032 | err = fuse_bdi_init(fc, sb); |
| 1033 | if (err) |
| 1034 | goto err_put_conn; |
Tejun Heo | 0d179aa | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1035 | |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 1036 | sb->s_bdi = &fc->bdi; |
| 1037 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 1038 | /* Handle umasking inside the fuse code */ |
| 1039 | if (sb->s_flags & MS_POSIXACL) |
| 1040 | fc->dont_mask = 1; |
| 1041 | sb->s_flags |= MS_POSIXACL; |
| 1042 | |
Tejun Heo | 43901aa | 2008-11-26 12:03:56 +0100 | [diff] [blame] | 1043 | fc->release = fuse_free_conn; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1044 | fc->flags = d.flags; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1045 | fc->user_id = d.user_id; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1046 | fc->group_id = d.group_id; |
Miklos Szeredi | f948d56 | 2008-06-17 18:05:40 +0200 | [diff] [blame] | 1047 | fc->max_read = max_t(unsigned, 4096, d.max_read); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1048 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1049 | /* Used by get_root_inode() */ |
| 1050 | sb->s_fs_info = fc; |
| 1051 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1052 | err = -ENOMEM; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1053 | root = fuse_get_root_inode(sb, d.rootmode); |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 1054 | root_dentry = d_make_root(root); |
| 1055 | if (!root_dentry) |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1056 | goto err_put_conn; |
Al Viro | c35eebe | 2010-12-18 11:15:22 -0500 | [diff] [blame] | 1057 | /* only now - we want root dentry with NULL ->d_op */ |
| 1058 | sb->s_d_op = &fuse_dentry_operations; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1059 | |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 1060 | init_req = fuse_request_alloc(0); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1061 | if (!init_req) |
| 1062 | goto err_put_root; |
Maxim Patlasov | 8b41e67 | 2013-03-21 18:02:04 +0400 | [diff] [blame] | 1063 | init_req->background = 1; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1064 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 1065 | if (is_bdev) { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 1066 | fc->destroy_req = fuse_request_alloc(0); |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 1067 | if (!fc->destroy_req) |
Julia Lawall | 17e18ab | 2008-10-16 16:08:56 +0200 | [diff] [blame] | 1068 | goto err_free_init_req; |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 1069 | } |
| 1070 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1071 | mutex_lock(&fuse_mutex); |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 1072 | err = -EINVAL; |
| 1073 | if (file->private_data) |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1074 | goto err_unlock; |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 1075 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1076 | err = fuse_ctl_add_conn(fc); |
| 1077 | if (err) |
| 1078 | goto err_unlock; |
| 1079 | |
| 1080 | list_add_tail(&fc->entry, &fuse_conn_list); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1081 | sb->s_root = root_dentry; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1082 | fc->connected = 1; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1083 | file->private_data = fuse_conn_get(fc); |
| 1084 | mutex_unlock(&fuse_mutex); |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1085 | /* |
| 1086 | * atomic_dec_and_test() in fput() provides the necessary |
| 1087 | * memory barrier for file->private_data to be visible on all |
| 1088 | * CPUs after this |
| 1089 | */ |
| 1090 | fput(file); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1091 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1092 | fuse_send_init(fc, init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1093 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1094 | return 0; |
| 1095 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1096 | err_unlock: |
| 1097 | mutex_unlock(&fuse_mutex); |
Julia Lawall | 17e18ab | 2008-10-16 16:08:56 +0200 | [diff] [blame] | 1098 | err_free_init_req: |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1099 | fuse_request_free(init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1100 | err_put_root: |
| 1101 | dput(root_dentry); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1102 | err_put_conn: |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 1103 | fuse_bdi_destroy(fc); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1104 | fuse_conn_put(fc); |
Miklos Szeredi | c2b8f00 | 2009-01-26 15:00:58 +0100 | [diff] [blame] | 1105 | err_fput: |
| 1106 | fput(file); |
| 1107 | err: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1108 | return err; |
| 1109 | } |
| 1110 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1111 | static struct dentry *fuse_mount(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1112 | int flags, const char *dev_name, |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1113 | void *raw_data) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1114 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1115 | return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1116 | } |
| 1117 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1118 | static void fuse_kill_sb_anon(struct super_block *sb) |
| 1119 | { |
| 1120 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 1121 | |
| 1122 | if (fc) { |
| 1123 | down_write(&fc->killsb); |
| 1124 | fc->sb = NULL; |
| 1125 | up_write(&fc->killsb); |
| 1126 | } |
| 1127 | |
| 1128 | kill_anon_super(sb); |
| 1129 | } |
| 1130 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1131 | static struct file_system_type fuse_fs_type = { |
| 1132 | .owner = THIS_MODULE, |
| 1133 | .name = "fuse", |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 1134 | .fs_flags = FS_HAS_SUBTYPE, |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1135 | .mount = fuse_mount, |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1136 | .kill_sb = fuse_kill_sb_anon, |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1137 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1138 | MODULE_ALIAS_FS("fuse"); |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1139 | |
| 1140 | #ifdef CONFIG_BLOCK |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1141 | static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1142 | int flags, const char *dev_name, |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1143 | void *raw_data) |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1144 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1145 | return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1146 | } |
| 1147 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1148 | static void fuse_kill_sb_blk(struct super_block *sb) |
| 1149 | { |
| 1150 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 1151 | |
| 1152 | if (fc) { |
| 1153 | down_write(&fc->killsb); |
| 1154 | fc->sb = NULL; |
| 1155 | up_write(&fc->killsb); |
| 1156 | } |
| 1157 | |
| 1158 | kill_block_super(sb); |
| 1159 | } |
| 1160 | |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1161 | static struct file_system_type fuseblk_fs_type = { |
| 1162 | .owner = THIS_MODULE, |
| 1163 | .name = "fuseblk", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1164 | .mount = fuse_mount_blk, |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1165 | .kill_sb = fuse_kill_sb_blk, |
Alexey Dobriyan | edad01e | 2007-06-16 10:16:05 -0700 | [diff] [blame] | 1166 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1167 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1168 | MODULE_ALIAS_FS("fuseblk"); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1169 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1170 | static inline int register_fuseblk(void) |
| 1171 | { |
| 1172 | return register_filesystem(&fuseblk_fs_type); |
| 1173 | } |
| 1174 | |
| 1175 | static inline void unregister_fuseblk(void) |
| 1176 | { |
| 1177 | unregister_filesystem(&fuseblk_fs_type); |
| 1178 | } |
| 1179 | #else |
| 1180 | static inline int register_fuseblk(void) |
| 1181 | { |
| 1182 | return 0; |
| 1183 | } |
| 1184 | |
| 1185 | static inline void unregister_fuseblk(void) |
| 1186 | { |
| 1187 | } |
| 1188 | #endif |
| 1189 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1190 | static void fuse_inode_init_once(void *foo) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1191 | { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1192 | struct inode *inode = foo; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1193 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 1194 | inode_init_once(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1195 | } |
| 1196 | |
| 1197 | static int __init fuse_fs_init(void) |
| 1198 | { |
| 1199 | int err; |
| 1200 | |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1201 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
| 1202 | sizeof(struct fuse_inode), |
| 1203 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1204 | fuse_inode_init_once); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1205 | err = -ENOMEM; |
| 1206 | if (!fuse_inode_cachep) |
Al Viro | 988f032 | 2011-12-13 12:25:27 -0500 | [diff] [blame] | 1207 | goto out; |
| 1208 | |
| 1209 | err = register_fuseblk(); |
| 1210 | if (err) |
| 1211 | goto out2; |
| 1212 | |
| 1213 | err = register_filesystem(&fuse_fs_type); |
| 1214 | if (err) |
| 1215 | goto out3; |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1216 | |
| 1217 | return 0; |
| 1218 | |
Al Viro | 988f032 | 2011-12-13 12:25:27 -0500 | [diff] [blame] | 1219 | out3: |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1220 | unregister_fuseblk(); |
Al Viro | 988f032 | 2011-12-13 12:25:27 -0500 | [diff] [blame] | 1221 | out2: |
| 1222 | kmem_cache_destroy(fuse_inode_cachep); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 1223 | out: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1224 | return err; |
| 1225 | } |
| 1226 | |
| 1227 | static void fuse_fs_cleanup(void) |
| 1228 | { |
| 1229 | unregister_filesystem(&fuse_fs_type); |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 1230 | unregister_fuseblk(); |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 1231 | |
| 1232 | /* |
| 1233 | * Make sure all delayed rcu free inodes are flushed before we |
| 1234 | * destroy cache. |
| 1235 | */ |
| 1236 | rcu_barrier(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1237 | kmem_cache_destroy(fuse_inode_cachep); |
| 1238 | } |
| 1239 | |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1240 | static struct kobject *fuse_kobj; |
| 1241 | static struct kobject *connections_kobj; |
| 1242 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1243 | static int fuse_sysfs_init(void) |
| 1244 | { |
| 1245 | int err; |
| 1246 | |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 1247 | fuse_kobj = kobject_create_and_add("fuse", fs_kobj); |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1248 | if (!fuse_kobj) { |
| 1249 | err = -ENOMEM; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1250 | goto out_err; |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1251 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1252 | |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1253 | connections_kobj = kobject_create_and_add("connections", fuse_kobj); |
| 1254 | if (!connections_kobj) { |
| 1255 | err = -ENOMEM; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1256 | goto out_fuse_unregister; |
Greg Kroah-Hartman | 5c89e17 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 1257 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1258 | |
| 1259 | return 0; |
| 1260 | |
| 1261 | out_fuse_unregister: |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1262 | kobject_put(fuse_kobj); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1263 | out_err: |
| 1264 | return err; |
| 1265 | } |
| 1266 | |
| 1267 | static void fuse_sysfs_cleanup(void) |
| 1268 | { |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1269 | kobject_put(connections_kobj); |
| 1270 | kobject_put(fuse_kobj); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1271 | } |
| 1272 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1273 | static int __init fuse_init(void) |
| 1274 | { |
| 1275 | int res; |
| 1276 | |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1277 | printk(KERN_INFO "fuse init (API version %i.%i)\n", |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1278 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
| 1279 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1280 | INIT_LIST_HEAD(&fuse_conn_list); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1281 | res = fuse_fs_init(); |
| 1282 | if (res) |
| 1283 | goto err; |
| 1284 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1285 | res = fuse_dev_init(); |
| 1286 | if (res) |
| 1287 | goto err_fs_cleanup; |
| 1288 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1289 | res = fuse_sysfs_init(); |
| 1290 | if (res) |
| 1291 | goto err_dev_cleanup; |
| 1292 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1293 | res = fuse_ctl_init(); |
| 1294 | if (res) |
| 1295 | goto err_sysfs_cleanup; |
| 1296 | |
Csaba Henk | 487ea5a | 2009-08-26 19:17:22 +0200 | [diff] [blame] | 1297 | sanitize_global_limit(&max_user_bgreq); |
| 1298 | sanitize_global_limit(&max_user_congthresh); |
| 1299 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1300 | return 0; |
| 1301 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1302 | err_sysfs_cleanup: |
| 1303 | fuse_sysfs_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1304 | err_dev_cleanup: |
| 1305 | fuse_dev_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1306 | err_fs_cleanup: |
| 1307 | fuse_fs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1308 | err: |
| 1309 | return res; |
| 1310 | } |
| 1311 | |
| 1312 | static void __exit fuse_exit(void) |
| 1313 | { |
| 1314 | printk(KERN_DEBUG "fuse exit\n"); |
| 1315 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1316 | fuse_ctl_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1317 | fuse_sysfs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1318 | fuse_fs_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1319 | fuse_dev_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | module_init(fuse_init); |
| 1323 | module_exit(fuse_exit); |