Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -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 | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 4 | |
| 5 | This program can be distributed under the terms of the GNU GPL. |
| 6 | See the file COPYING. |
| 7 | */ |
| 8 | |
| 9 | #include "fuse_i.h" |
| 10 | |
| 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/file.h> |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 13 | #include <linux/sched.h> |
| 14 | #include <linux/namei.h> |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 15 | #include <linux/slab.h> |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 16 | #include <linux/xattr.h> |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 17 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 18 | static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 19 | { |
| 20 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 21 | struct fuse_inode *fi = get_fuse_inode(dir); |
| 22 | |
| 23 | if (!fc->do_readdirplus) |
| 24 | return false; |
Eric Wong | 634734b | 2013-02-06 22:29:01 +0000 | [diff] [blame] | 25 | if (!fc->readdirplus_auto) |
| 26 | return true; |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 27 | if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state)) |
| 28 | return true; |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 29 | if (ctx->pos == 0) |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 30 | return true; |
| 31 | return false; |
| 32 | } |
| 33 | |
| 34 | static void fuse_advise_use_readdirplus(struct inode *dir) |
| 35 | { |
| 36 | struct fuse_inode *fi = get_fuse_inode(dir); |
| 37 | |
| 38 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); |
| 39 | } |
| 40 | |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 41 | #if BITS_PER_LONG >= 64 |
| 42 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) |
| 43 | { |
| 44 | entry->d_time = time; |
| 45 | } |
| 46 | |
| 47 | static inline u64 fuse_dentry_time(struct dentry *entry) |
| 48 | { |
| 49 | return entry->d_time; |
| 50 | } |
| 51 | #else |
| 52 | /* |
| 53 | * On 32 bit archs store the high 32 bits of time in d_fsdata |
| 54 | */ |
| 55 | static void fuse_dentry_settime(struct dentry *entry, u64 time) |
| 56 | { |
| 57 | entry->d_time = time; |
| 58 | entry->d_fsdata = (void *) (unsigned long) (time >> 32); |
| 59 | } |
| 60 | |
| 61 | static u64 fuse_dentry_time(struct dentry *entry) |
| 62 | { |
| 63 | return (u64) entry->d_time + |
| 64 | ((u64) (unsigned long) entry->d_fsdata << 32); |
| 65 | } |
| 66 | #endif |
| 67 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 68 | /* |
| 69 | * FUSE caches dentries and attributes with separate timeout. The |
| 70 | * time in jiffies until the dentry/attributes are valid is stored in |
| 71 | * dentry->d_time and fuse_inode->i_time respectively. |
| 72 | */ |
| 73 | |
| 74 | /* |
| 75 | * Calculate the time in jiffies until a dentry/attributes are valid |
| 76 | */ |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 77 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 78 | { |
Miklos Szeredi | 685d16d | 2006-07-30 03:04:08 -0700 | [diff] [blame] | 79 | if (sec || nsec) { |
| 80 | struct timespec ts = {sec, nsec}; |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 81 | return get_jiffies_64() + timespec_to_jiffies(&ts); |
Miklos Szeredi | 685d16d | 2006-07-30 03:04:08 -0700 | [diff] [blame] | 82 | } else |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 83 | return 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 86 | /* |
| 87 | * Set dentry and possibly attribute timeouts from the lookup/mk* |
| 88 | * replies |
| 89 | */ |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 90 | static void fuse_change_entry_timeout(struct dentry *entry, |
| 91 | struct fuse_entry_out *o) |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 92 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 93 | fuse_dentry_settime(entry, |
| 94 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static u64 attr_timeout(struct fuse_attr_out *o) |
| 98 | { |
| 99 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); |
| 100 | } |
| 101 | |
| 102 | static u64 entry_attr_timeout(struct fuse_entry_out *o) |
| 103 | { |
| 104 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 105 | } |
| 106 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 107 | /* |
| 108 | * Mark the attributes as stale, so that at the next call to |
| 109 | * ->getattr() they will be fetched from userspace |
| 110 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 111 | void fuse_invalidate_attr(struct inode *inode) |
| 112 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 113 | get_fuse_inode(inode)->i_time = 0; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 114 | } |
| 115 | |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 116 | /** |
| 117 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if |
| 118 | * atime is not used. |
| 119 | */ |
| 120 | void fuse_invalidate_atime(struct inode *inode) |
| 121 | { |
| 122 | if (!IS_RDONLY(inode)) |
| 123 | fuse_invalidate_attr(inode); |
| 124 | } |
| 125 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 126 | /* |
| 127 | * Just mark the entry as stale, so that a next attempt to look it up |
| 128 | * will result in a new lookup call to userspace |
| 129 | * |
| 130 | * This is called when a dentry is about to become negative and the |
| 131 | * timeout is unknown (unlink, rmdir, rename and in some cases |
| 132 | * lookup) |
| 133 | */ |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 134 | void fuse_invalidate_entry_cache(struct dentry *entry) |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 135 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 136 | fuse_dentry_settime(entry, 0); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 137 | } |
| 138 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 139 | /* |
| 140 | * Same as fuse_invalidate_entry_cache(), but also try to remove the |
| 141 | * dentry from the hash |
| 142 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 143 | static void fuse_invalidate_entry(struct dentry *entry) |
| 144 | { |
| 145 | d_invalidate(entry); |
| 146 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 147 | } |
| 148 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 149 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
Al Viro | 13983d0 | 2016-07-20 22:34:44 -0400 | [diff] [blame] | 150 | u64 nodeid, const struct qstr *name, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 151 | struct fuse_entry_out *outarg) |
| 152 | { |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 153 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 154 | args->in.h.opcode = FUSE_LOOKUP; |
| 155 | args->in.h.nodeid = nodeid; |
| 156 | args->in.numargs = 1; |
| 157 | args->in.args[0].size = name->len + 1; |
| 158 | args->in.args[0].value = name->name; |
| 159 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 160 | args->out.args[0].size = sizeof(struct fuse_entry_out); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 161 | args->out.args[0].value = outarg; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Miklos Szeredi | 5c5c5e5 | 2008-04-30 00:54:43 -0700 | [diff] [blame] | 164 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 165 | { |
| 166 | u64 curr_version; |
| 167 | |
| 168 | /* |
| 169 | * The spin lock isn't actually needed on 64bit archs, but we |
| 170 | * don't yet care too much about such optimizations. |
| 171 | */ |
| 172 | spin_lock(&fc->lock); |
| 173 | curr_version = fc->attr_version; |
| 174 | spin_unlock(&fc->lock); |
| 175 | |
| 176 | return curr_version; |
| 177 | } |
| 178 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 179 | /* |
| 180 | * Check whether the dentry is still valid |
| 181 | * |
| 182 | * If the entry validity timeout has expired and the dentry is |
| 183 | * positive, try to redo the lookup. If the lookup results in a |
| 184 | * different inode, then let the VFS invalidate the dentry and redo |
| 185 | * the lookup once more. If the lookup results in the same inode, |
| 186 | * then refresh the attributes, timeouts and mark the dentry valid. |
| 187 | */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 188 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 189 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 190 | struct inode *inode; |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 191 | struct dentry *parent; |
| 192 | struct fuse_conn *fc; |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 193 | struct fuse_inode *fi; |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 194 | int ret; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 195 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 196 | inode = d_inode_rcu(entry); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 197 | if (inode && is_bad_inode(inode)) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 198 | goto invalid; |
Anand Avati | 154210c | 2014-06-26 20:21:57 -0400 | [diff] [blame] | 199 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
| 200 | (flags & LOOKUP_REVAL)) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 201 | struct fuse_entry_out outarg; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 202 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 203 | struct fuse_forget_link *forget; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 204 | u64 attr_version; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 205 | |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 206 | /* For negative dentries, always do a fresh lookup */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 207 | if (!inode) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 208 | goto invalid; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 209 | |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 210 | ret = -ECHILD; |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 211 | if (flags & LOOKUP_RCU) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 212 | goto out; |
Miklos Szeredi | e7c0a16 | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 213 | |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 214 | fc = get_fuse_conn(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 215 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 216 | forget = fuse_alloc_forget(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 217 | ret = -ENOMEM; |
| 218 | if (!forget) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 219 | goto out; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 220 | |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 221 | attr_version = fuse_get_attr_version(fc); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 222 | |
Miklos Szeredi | e956edd | 2006-10-17 00:10:12 -0700 | [diff] [blame] | 223 | parent = dget_parent(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 224 | fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)), |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 225 | &entry->d_name, &outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 226 | ret = fuse_simple_request(fc, &args); |
Miklos Szeredi | e956edd | 2006-10-17 00:10:12 -0700 | [diff] [blame] | 227 | dput(parent); |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 228 | /* Zero nodeid is same as -ENOENT */ |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 229 | if (!ret && !outarg.nodeid) |
| 230 | ret = -ENOENT; |
| 231 | if (!ret) { |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 232 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 233 | if (outarg.nodeid != get_node_id(inode)) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 234 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 235 | goto invalid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 236 | } |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 237 | spin_lock(&fc->lock); |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 238 | fi->nlookup++; |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 239 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 240 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 241 | kfree(forget); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 242 | if (ret == -ENOMEM) |
| 243 | goto out; |
| 244 | if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 245 | goto invalid; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 246 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 247 | fuse_change_attributes(inode, &outarg.attr, |
| 248 | entry_attr_timeout(&outarg), |
| 249 | attr_version); |
| 250 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 251 | } else if (inode) { |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 252 | fi = get_fuse_inode(inode); |
| 253 | if (flags & LOOKUP_RCU) { |
| 254 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) |
| 255 | return -ECHILD; |
| 256 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 257 | parent = dget_parent(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 258 | fuse_advise_use_readdirplus(d_inode(parent)); |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 259 | dput(parent); |
| 260 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 261 | } |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 262 | ret = 1; |
| 263 | out: |
| 264 | return ret; |
| 265 | |
| 266 | invalid: |
| 267 | ret = 0; |
| 268 | goto out; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 271 | static int invalid_nodeid(u64 nodeid) |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 272 | { |
| 273 | return !nodeid || nodeid == FUSE_ROOT_ID; |
| 274 | } |
| 275 | |
Al Viro | 4269590 | 2009-02-20 05:59:13 +0000 | [diff] [blame] | 276 | const struct dentry_operations fuse_dentry_operations = { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 277 | .d_revalidate = fuse_dentry_revalidate, |
| 278 | }; |
| 279 | |
Timo Savola | a5bfffac | 2007-04-08 16:04:00 -0700 | [diff] [blame] | 280 | int fuse_valid_type(int m) |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 281 | { |
| 282 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || |
| 283 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); |
| 284 | } |
| 285 | |
Al Viro | 13983d0 | 2016-07-20 22:34:44 -0400 | [diff] [blame] | 286 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 287 | struct fuse_entry_out *outarg, struct inode **inode) |
| 288 | { |
| 289 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 290 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 291 | struct fuse_forget_link *forget; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 292 | u64 attr_version; |
| 293 | int err; |
| 294 | |
| 295 | *inode = NULL; |
| 296 | err = -ENAMETOOLONG; |
| 297 | if (name->len > FUSE_NAME_MAX) |
| 298 | goto out; |
| 299 | |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 300 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 301 | forget = fuse_alloc_forget(); |
| 302 | err = -ENOMEM; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 303 | if (!forget) |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 304 | goto out; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 305 | |
| 306 | attr_version = fuse_get_attr_version(fc); |
| 307 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 308 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
| 309 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 310 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
| 311 | if (err || !outarg->nodeid) |
| 312 | goto out_put_forget; |
| 313 | |
| 314 | err = -EIO; |
| 315 | if (!outarg->nodeid) |
| 316 | goto out_put_forget; |
| 317 | if (!fuse_valid_type(outarg->attr.mode)) |
| 318 | goto out_put_forget; |
| 319 | |
| 320 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, |
| 321 | &outarg->attr, entry_attr_timeout(outarg), |
| 322 | attr_version); |
| 323 | err = -ENOMEM; |
| 324 | if (!*inode) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 325 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 326 | goto out; |
| 327 | } |
| 328 | err = 0; |
| 329 | |
| 330 | out_put_forget: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 331 | kfree(forget); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 332 | out: |
| 333 | return err; |
| 334 | } |
| 335 | |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 336 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 337 | unsigned int flags) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 338 | { |
| 339 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 340 | struct fuse_entry_out outarg; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 341 | struct inode *inode; |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 342 | struct dentry *newent; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 343 | bool outarg_valid = true; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 344 | |
Miklos Szeredi | 5c672ab | 2016-06-30 13:10:49 +0200 | [diff] [blame] | 345 | fuse_lock_inode(dir); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 346 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
| 347 | &outarg, &inode); |
Miklos Szeredi | 5c672ab | 2016-06-30 13:10:49 +0200 | [diff] [blame] | 348 | fuse_unlock_inode(dir); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 349 | if (err == -ENOENT) { |
| 350 | outarg_valid = false; |
| 351 | err = 0; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 352 | } |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 353 | if (err) |
| 354 | goto out_err; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 355 | |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 356 | err = -EIO; |
| 357 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) |
| 358 | goto out_iput; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 359 | |
Al Viro | 41d28bc | 2014-10-12 22:24:21 -0400 | [diff] [blame] | 360 | newent = d_splice_alias(inode, entry); |
Miklos Szeredi | 5835f33 | 2013-09-05 11:44:42 +0200 | [diff] [blame] | 361 | err = PTR_ERR(newent); |
| 362 | if (IS_ERR(newent)) |
| 363 | goto out_err; |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 364 | |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 365 | entry = newent ? newent : entry; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 366 | if (outarg_valid) |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 367 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 368 | else |
| 369 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 370 | |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 371 | fuse_advise_use_readdirplus(dir); |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 372 | return newent; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 373 | |
| 374 | out_iput: |
| 375 | iput(inode); |
| 376 | out_err: |
| 377 | return ERR_PTR(err); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 380 | /* |
| 381 | * Atomic create+open operation |
| 382 | * |
| 383 | * If the filesystem doesn't support this, then fall back to separate |
| 384 | * 'mknod' + 'open' requests. |
| 385 | */ |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 386 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 387 | struct file *file, unsigned flags, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 388 | umode_t mode, int *opened) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 389 | { |
| 390 | int err; |
| 391 | struct inode *inode; |
| 392 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 393 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 394 | struct fuse_forget_link *forget; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 395 | struct fuse_create_in inarg; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 396 | struct fuse_open_out outopen; |
| 397 | struct fuse_entry_out outentry; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 398 | struct fuse_file *ff; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 399 | |
Miklos Szeredi | af109bc | 2012-08-15 13:01:24 +0200 | [diff] [blame] | 400 | /* Userspace expects S_IFREG in create mode */ |
| 401 | BUG_ON((mode & S_IFMT) != S_IFREG); |
| 402 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 403 | forget = fuse_alloc_forget(); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 404 | err = -ENOMEM; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 405 | if (!forget) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 406 | goto out_err; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 407 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 408 | err = -ENOMEM; |
Tejun Heo | acf9943 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 409 | ff = fuse_file_alloc(fc); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 410 | if (!ff) |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 411 | goto out_put_forget_req; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 412 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 413 | if (!fc->dont_mask) |
| 414 | mode &= ~current_umask(); |
| 415 | |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 416 | flags &= ~O_NOCTTY; |
| 417 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 418 | memset(&outentry, 0, sizeof(outentry)); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 419 | inarg.flags = flags; |
| 420 | inarg.mode = mode; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 421 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 422 | args.in.h.opcode = FUSE_CREATE; |
| 423 | args.in.h.nodeid = get_node_id(dir); |
| 424 | args.in.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 425 | args.in.args[0].size = sizeof(inarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 426 | args.in.args[0].value = &inarg; |
| 427 | args.in.args[1].size = entry->d_name.len + 1; |
| 428 | args.in.args[1].value = entry->d_name.name; |
| 429 | args.out.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 430 | args.out.args[0].size = sizeof(outentry); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 431 | args.out.args[0].value = &outentry; |
| 432 | args.out.args[1].size = sizeof(outopen); |
| 433 | args.out.args[1].value = &outopen; |
| 434 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 435 | if (err) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 436 | goto out_free_ff; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 437 | |
| 438 | err = -EIO; |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 439 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 440 | goto out_free_ff; |
| 441 | |
Miklos Szeredi | c7b7143 | 2009-04-28 16:56:37 +0200 | [diff] [blame] | 442 | ff->fh = outopen.fh; |
| 443 | ff->nodeid = outentry.nodeid; |
| 444 | ff->open_flags = outopen.open_flags; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 445 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 446 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 447 | if (!inode) { |
| 448 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 449 | fuse_sync_release(ff, flags); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 450 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 451 | err = -ENOMEM; |
| 452 | goto out_err; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 453 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 454 | kfree(forget); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 455 | d_instantiate(entry, inode); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 456 | fuse_change_entry_timeout(entry, &outentry); |
Miklos Szeredi | 0952b2a | 2008-02-06 01:38:38 -0800 | [diff] [blame] | 457 | fuse_invalidate_attr(dir); |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 458 | err = finish_open(file, entry, generic_file_open, opened); |
| 459 | if (err) { |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 460 | fuse_sync_release(ff, flags); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 461 | } else { |
| 462 | file->private_data = fuse_file_get(ff); |
| 463 | fuse_finish_open(inode, file); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 464 | } |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 465 | return err; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 466 | |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 467 | out_free_ff: |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 468 | fuse_file_free(ff); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 469 | out_put_forget_req: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 470 | kfree(forget); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 471 | out_err: |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 472 | return err; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 476 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 477 | struct file *file, unsigned flags, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 478 | umode_t mode, int *opened) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 479 | { |
| 480 | int err; |
| 481 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 482 | struct dentry *res = NULL; |
| 483 | |
Al Viro | 00699ad | 2016-07-05 09:44:53 -0400 | [diff] [blame] | 484 | if (d_in_lookup(entry)) { |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 485 | res = fuse_lookup(dir, entry, 0); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 486 | if (IS_ERR(res)) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 487 | return PTR_ERR(res); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 488 | |
| 489 | if (res) |
| 490 | entry = res; |
| 491 | } |
| 492 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 493 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 494 | goto no_open; |
| 495 | |
| 496 | /* Only creates */ |
Al Viro | 4723768 | 2012-06-10 05:01:45 -0400 | [diff] [blame] | 497 | *opened |= FILE_CREATED; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 498 | |
| 499 | if (fc->no_create) |
| 500 | goto mknod; |
| 501 | |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 502 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 503 | if (err == -ENOSYS) { |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 504 | fc->no_create = 1; |
| 505 | goto mknod; |
| 506 | } |
| 507 | out_dput: |
| 508 | dput(res); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 509 | return err; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 510 | |
| 511 | mknod: |
| 512 | err = fuse_mknod(dir, entry, mode, 0); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 513 | if (err) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 514 | goto out_dput; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 515 | no_open: |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 516 | return finish_no_open(file, res); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 517 | } |
| 518 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 519 | /* |
| 520 | * Code shared between mknod, mkdir, symlink and link |
| 521 | */ |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 522 | static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 523 | struct inode *dir, struct dentry *entry, |
Al Viro | 541af6a | 2011-07-26 03:17:33 -0400 | [diff] [blame] | 524 | umode_t mode) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 525 | { |
| 526 | struct fuse_entry_out outarg; |
| 527 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 528 | int err; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 529 | struct fuse_forget_link *forget; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 530 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 531 | forget = fuse_alloc_forget(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 532 | if (!forget) |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 533 | return -ENOMEM; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 534 | |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 535 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 536 | args->in.h.nodeid = get_node_id(dir); |
| 537 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 538 | args->out.args[0].size = sizeof(outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 539 | args->out.args[0].value = &outarg; |
| 540 | err = fuse_simple_request(fc, args); |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 541 | if (err) |
| 542 | goto out_put_forget_req; |
| 543 | |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 544 | err = -EIO; |
| 545 | if (invalid_nodeid(outarg.nodeid)) |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 546 | goto out_put_forget_req; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 547 | |
| 548 | if ((outarg.attr.mode ^ mode) & S_IFMT) |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 549 | goto out_put_forget_req; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 550 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 551 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 552 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 553 | if (!inode) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 554 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 555 | return -ENOMEM; |
| 556 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 557 | kfree(forget); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 558 | |
Miklos Szeredi | b70a80e | 2013-10-01 16:44:54 +0200 | [diff] [blame] | 559 | err = d_instantiate_no_diralias(entry, inode); |
| 560 | if (err) |
| 561 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 562 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 563 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 564 | fuse_invalidate_attr(dir); |
| 565 | return 0; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 566 | |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 567 | out_put_forget_req: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 568 | kfree(forget); |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 569 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 570 | } |
| 571 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 572 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 573 | dev_t rdev) |
| 574 | { |
| 575 | struct fuse_mknod_in inarg; |
| 576 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 577 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 578 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 579 | if (!fc->dont_mask) |
| 580 | mode &= ~current_umask(); |
| 581 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 582 | memset(&inarg, 0, sizeof(inarg)); |
| 583 | inarg.mode = mode; |
| 584 | inarg.rdev = new_encode_dev(rdev); |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 585 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 586 | args.in.h.opcode = FUSE_MKNOD; |
| 587 | args.in.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 588 | args.in.args[0].size = sizeof(inarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 589 | args.in.args[0].value = &inarg; |
| 590 | args.in.args[1].size = entry->d_name.len + 1; |
| 591 | args.in.args[1].value = entry->d_name.name; |
| 592 | return create_new_entry(fc, &args, dir, entry, mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 595 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 596 | bool excl) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 597 | { |
| 598 | return fuse_mknod(dir, entry, mode, 0); |
| 599 | } |
| 600 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 601 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 602 | { |
| 603 | struct fuse_mkdir_in inarg; |
| 604 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 605 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 606 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 607 | if (!fc->dont_mask) |
| 608 | mode &= ~current_umask(); |
| 609 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 610 | memset(&inarg, 0, sizeof(inarg)); |
| 611 | inarg.mode = mode; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 612 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 613 | args.in.h.opcode = FUSE_MKDIR; |
| 614 | args.in.numargs = 2; |
| 615 | args.in.args[0].size = sizeof(inarg); |
| 616 | args.in.args[0].value = &inarg; |
| 617 | args.in.args[1].size = entry->d_name.len + 1; |
| 618 | args.in.args[1].value = entry->d_name.name; |
| 619 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | static int fuse_symlink(struct inode *dir, struct dentry *entry, |
| 623 | const char *link) |
| 624 | { |
| 625 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 626 | unsigned len = strlen(link) + 1; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 627 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 628 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 629 | args.in.h.opcode = FUSE_SYMLINK; |
| 630 | args.in.numargs = 2; |
| 631 | args.in.args[0].size = entry->d_name.len + 1; |
| 632 | args.in.args[0].value = entry->d_name.name; |
| 633 | args.in.args[1].size = len; |
| 634 | args.in.args[1].value = link; |
| 635 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 636 | } |
| 637 | |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 638 | void fuse_update_ctime(struct inode *inode) |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 639 | { |
| 640 | if (!IS_NOCMTIME(inode)) { |
| 641 | inode->i_ctime = current_fs_time(inode->i_sb); |
| 642 | mark_inode_dirty_sync(inode); |
| 643 | } |
| 644 | } |
| 645 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 646 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
| 647 | { |
| 648 | int err; |
| 649 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 650 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 651 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 652 | args.in.h.opcode = FUSE_UNLINK; |
| 653 | args.in.h.nodeid = get_node_id(dir); |
| 654 | args.in.numargs = 1; |
| 655 | args.in.args[0].size = entry->d_name.len + 1; |
| 656 | args.in.args[0].value = entry->d_name.name; |
| 657 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 658 | if (!err) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 659 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 660 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 661 | |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 662 | spin_lock(&fc->lock); |
| 663 | fi->attr_version = ++fc->attr_version; |
Miklos Szeredi | dfca7ce | 2013-02-04 15:57:42 +0100 | [diff] [blame] | 664 | /* |
| 665 | * If i_nlink == 0 then unlink doesn't make sense, yet this can |
| 666 | * happen if userspace filesystem is careless. It would be |
| 667 | * difficult to enforce correct nlink usage so just ignore this |
| 668 | * condition here |
| 669 | */ |
| 670 | if (inode->i_nlink > 0) |
| 671 | drop_nlink(inode); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 672 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 673 | fuse_invalidate_attr(inode); |
| 674 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 675 | fuse_invalidate_entry_cache(entry); |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 676 | fuse_update_ctime(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 677 | } else if (err == -EINTR) |
| 678 | fuse_invalidate_entry(entry); |
| 679 | return err; |
| 680 | } |
| 681 | |
| 682 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) |
| 683 | { |
| 684 | int err; |
| 685 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 686 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 687 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 688 | args.in.h.opcode = FUSE_RMDIR; |
| 689 | args.in.h.nodeid = get_node_id(dir); |
| 690 | args.in.numargs = 1; |
| 691 | args.in.args[0].size = entry->d_name.len + 1; |
| 692 | args.in.args[0].value = entry->d_name.name; |
| 693 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 694 | if (!err) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 695 | clear_nlink(d_inode(entry)); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 696 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 697 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 698 | } else if (err == -EINTR) |
| 699 | fuse_invalidate_entry(entry); |
| 700 | return err; |
| 701 | } |
| 702 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 703 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
| 704 | struct inode *newdir, struct dentry *newent, |
| 705 | unsigned int flags, int opcode, size_t argsize) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 706 | { |
| 707 | int err; |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 708 | struct fuse_rename2_in inarg; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 709 | struct fuse_conn *fc = get_fuse_conn(olddir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 710 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 711 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 712 | memset(&inarg, 0, argsize); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 713 | inarg.newdir = get_node_id(newdir); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 714 | inarg.flags = flags; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 715 | args.in.h.opcode = opcode; |
| 716 | args.in.h.nodeid = get_node_id(olddir); |
| 717 | args.in.numargs = 3; |
| 718 | args.in.args[0].size = argsize; |
| 719 | args.in.args[0].value = &inarg; |
| 720 | args.in.args[1].size = oldent->d_name.len + 1; |
| 721 | args.in.args[1].value = oldent->d_name.name; |
| 722 | args.in.args[2].size = newent->d_name.len + 1; |
| 723 | args.in.args[2].value = newent->d_name.name; |
| 724 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 725 | if (!err) { |
Miklos Szeredi | 08b6330 | 2007-11-28 16:22:03 -0800 | [diff] [blame] | 726 | /* ctime changes */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 727 | fuse_invalidate_attr(d_inode(oldent)); |
| 728 | fuse_update_ctime(d_inode(oldent)); |
Miklos Szeredi | 08b6330 | 2007-11-28 16:22:03 -0800 | [diff] [blame] | 729 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 730 | if (flags & RENAME_EXCHANGE) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 731 | fuse_invalidate_attr(d_inode(newent)); |
| 732 | fuse_update_ctime(d_inode(newent)); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 733 | } |
| 734 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 735 | fuse_invalidate_attr(olddir); |
| 736 | if (olddir != newdir) |
| 737 | fuse_invalidate_attr(newdir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 738 | |
| 739 | /* newent will end up negative */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 740 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
| 741 | fuse_invalidate_attr(d_inode(newent)); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 742 | fuse_invalidate_entry_cache(newent); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 743 | fuse_update_ctime(d_inode(newent)); |
Miklos Szeredi | 5219f34 | 2009-11-04 10:24:52 +0100 | [diff] [blame] | 744 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 745 | } else if (err == -EINTR) { |
| 746 | /* If request was interrupted, DEITY only knows if the |
| 747 | rename actually took place. If the invalidation |
| 748 | fails (e.g. some process has CWD under the renamed |
| 749 | directory), then there can be inconsistency between |
| 750 | the dcache and the real filesystem. Tough luck. */ |
| 751 | fuse_invalidate_entry(oldent); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 752 | if (d_really_is_positive(newent)) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 753 | fuse_invalidate_entry(newent); |
| 754 | } |
| 755 | |
| 756 | return err; |
| 757 | } |
| 758 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 759 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
| 760 | struct inode *newdir, struct dentry *newent, |
| 761 | unsigned int flags) |
| 762 | { |
| 763 | struct fuse_conn *fc = get_fuse_conn(olddir); |
| 764 | int err; |
| 765 | |
| 766 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
| 767 | return -EINVAL; |
| 768 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 769 | if (flags) { |
| 770 | if (fc->no_rename2 || fc->minor < 23) |
| 771 | return -EINVAL; |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 772 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 773 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
| 774 | FUSE_RENAME2, |
| 775 | sizeof(struct fuse_rename2_in)); |
| 776 | if (err == -ENOSYS) { |
| 777 | fc->no_rename2 = 1; |
| 778 | err = -EINVAL; |
| 779 | } |
| 780 | } else { |
| 781 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, |
| 782 | FUSE_RENAME, |
| 783 | sizeof(struct fuse_rename_in)); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 784 | } |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 785 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 786 | return err; |
| 787 | } |
| 788 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 789 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
| 790 | struct dentry *newent) |
| 791 | { |
| 792 | int err; |
| 793 | struct fuse_link_in inarg; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 794 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 795 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 796 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 797 | |
| 798 | memset(&inarg, 0, sizeof(inarg)); |
| 799 | inarg.oldnodeid = get_node_id(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 800 | args.in.h.opcode = FUSE_LINK; |
| 801 | args.in.numargs = 2; |
| 802 | args.in.args[0].size = sizeof(inarg); |
| 803 | args.in.args[0].value = &inarg; |
| 804 | args.in.args[1].size = newent->d_name.len + 1; |
| 805 | args.in.args[1].value = newent->d_name.name; |
| 806 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 807 | /* Contrary to "normal" filesystems it can happen that link |
| 808 | makes two "logical" inodes point to the same "physical" |
| 809 | inode. We invalidate the attributes of the old one, so it |
| 810 | will reflect changes in the backing inode (link count, |
| 811 | etc.) |
| 812 | */ |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 813 | if (!err) { |
| 814 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 815 | |
| 816 | spin_lock(&fc->lock); |
| 817 | fi->attr_version = ++fc->attr_version; |
| 818 | inc_nlink(inode); |
| 819 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 820 | fuse_invalidate_attr(inode); |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 821 | fuse_update_ctime(inode); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 822 | } else if (err == -EINTR) { |
| 823 | fuse_invalidate_attr(inode); |
| 824 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 825 | return err; |
| 826 | } |
| 827 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 828 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
| 829 | struct kstat *stat) |
| 830 | { |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 831 | unsigned int blkbits; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 832 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 833 | |
| 834 | /* see the comment in fuse_change_attributes() */ |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 835 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 836 | attr->size = i_size_read(inode); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 837 | attr->mtime = inode->i_mtime.tv_sec; |
| 838 | attr->mtimensec = inode->i_mtime.tv_nsec; |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 839 | attr->ctime = inode->i_ctime.tv_sec; |
| 840 | attr->ctimensec = inode->i_ctime.tv_nsec; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 841 | } |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 842 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 843 | stat->dev = inode->i_sb->s_dev; |
| 844 | stat->ino = attr->ino; |
| 845 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
| 846 | stat->nlink = attr->nlink; |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 847 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
| 848 | stat->gid = make_kgid(&init_user_ns, attr->gid); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 849 | stat->rdev = inode->i_rdev; |
| 850 | stat->atime.tv_sec = attr->atime; |
| 851 | stat->atime.tv_nsec = attr->atimensec; |
| 852 | stat->mtime.tv_sec = attr->mtime; |
| 853 | stat->mtime.tv_nsec = attr->mtimensec; |
| 854 | stat->ctime.tv_sec = attr->ctime; |
| 855 | stat->ctime.tv_nsec = attr->ctimensec; |
| 856 | stat->size = attr->size; |
| 857 | stat->blocks = attr->blocks; |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 858 | |
| 859 | if (attr->blksize != 0) |
| 860 | blkbits = ilog2(attr->blksize); |
| 861 | else |
| 862 | blkbits = inode->i_sb->s_blocksize_bits; |
| 863 | |
| 864 | stat->blksize = 1 << blkbits; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 865 | } |
| 866 | |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 867 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
| 868 | struct file *file) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 869 | { |
| 870 | int err; |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 871 | struct fuse_getattr_in inarg; |
| 872 | struct fuse_attr_out outarg; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 873 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 874 | FUSE_ARGS(args); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 875 | u64 attr_version; |
| 876 | |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 877 | attr_version = fuse_get_attr_version(fc); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 878 | |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 879 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 880 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 881 | /* Directories have separate file-handle space */ |
| 882 | if (file && S_ISREG(inode->i_mode)) { |
| 883 | struct fuse_file *ff = file->private_data; |
| 884 | |
| 885 | inarg.getattr_flags |= FUSE_GETATTR_FH; |
| 886 | inarg.fh = ff->fh; |
| 887 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 888 | args.in.h.opcode = FUSE_GETATTR; |
| 889 | args.in.h.nodeid = get_node_id(inode); |
| 890 | args.in.numargs = 1; |
| 891 | args.in.args[0].size = sizeof(inarg); |
| 892 | args.in.args[0].value = &inarg; |
| 893 | args.out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 894 | args.out.args[0].size = sizeof(outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 895 | args.out.args[0].value = &outarg; |
| 896 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 897 | if (!err) { |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 898 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 899 | make_bad_inode(inode); |
| 900 | err = -EIO; |
| 901 | } else { |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 902 | fuse_change_attributes(inode, &outarg.attr, |
| 903 | attr_timeout(&outarg), |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 904 | attr_version); |
| 905 | if (stat) |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 906 | fuse_fillattr(inode, &outarg.attr, stat); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 907 | } |
| 908 | } |
| 909 | return err; |
| 910 | } |
| 911 | |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 912 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
| 913 | struct file *file, bool *refreshed) |
| 914 | { |
| 915 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 916 | int err; |
| 917 | bool r; |
| 918 | |
Miklos Szeredi | 126b9d4 | 2014-07-07 15:28:50 +0200 | [diff] [blame] | 919 | if (time_before64(fi->i_time, get_jiffies_64())) { |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 920 | r = true; |
| 921 | err = fuse_do_getattr(inode, stat, file); |
| 922 | } else { |
| 923 | r = false; |
| 924 | err = 0; |
| 925 | if (stat) { |
| 926 | generic_fillattr(inode, stat); |
| 927 | stat->mode = fi->orig_i_mode; |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 928 | stat->ino = fi->orig_ino; |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 929 | } |
| 930 | } |
| 931 | |
| 932 | if (refreshed != NULL) |
| 933 | *refreshed = r; |
| 934 | |
| 935 | return err; |
| 936 | } |
| 937 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 938 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 939 | u64 child_nodeid, struct qstr *name) |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 940 | { |
| 941 | int err = -ENOTDIR; |
| 942 | struct inode *parent; |
| 943 | struct dentry *dir; |
| 944 | struct dentry *entry; |
| 945 | |
| 946 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); |
| 947 | if (!parent) |
| 948 | return -ENOENT; |
| 949 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 950 | inode_lock(parent); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 951 | if (!S_ISDIR(parent->i_mode)) |
| 952 | goto unlock; |
| 953 | |
| 954 | err = -ENOENT; |
| 955 | dir = d_find_alias(parent); |
| 956 | if (!dir) |
| 957 | goto unlock; |
| 958 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 959 | name->hash = full_name_hash(dir, name->name, name->len); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 960 | entry = d_lookup(dir, name); |
| 961 | dput(dir); |
| 962 | if (!entry) |
| 963 | goto unlock; |
| 964 | |
| 965 | fuse_invalidate_attr(parent); |
| 966 | fuse_invalidate_entry(entry); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 967 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 968 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 969 | inode_lock(d_inode(entry)); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 970 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 971 | err = -ENOENT; |
| 972 | goto badentry; |
| 973 | } |
| 974 | if (d_mountpoint(entry)) { |
| 975 | err = -EBUSY; |
| 976 | goto badentry; |
| 977 | } |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 978 | if (d_is_dir(entry)) { |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 979 | shrink_dcache_parent(entry); |
| 980 | if (!simple_empty(entry)) { |
| 981 | err = -ENOTEMPTY; |
| 982 | goto badentry; |
| 983 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 984 | d_inode(entry)->i_flags |= S_DEAD; |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 985 | } |
| 986 | dont_mount(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 987 | clear_nlink(d_inode(entry)); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 988 | err = 0; |
| 989 | badentry: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 990 | inode_unlock(d_inode(entry)); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 991 | if (!err) |
| 992 | d_delete(entry); |
| 993 | } else { |
| 994 | err = 0; |
| 995 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 996 | dput(entry); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 997 | |
| 998 | unlock: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 999 | inode_unlock(parent); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1000 | iput(parent); |
| 1001 | return err; |
| 1002 | } |
| 1003 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1004 | /* |
| 1005 | * Calling into a user-controlled filesystem gives the filesystem |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1006 | * daemon ptrace-like capabilities over the current process. This |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1007 | * means, that the filesystem daemon is able to record the exact |
| 1008 | * filesystem operations performed, and can also control the behavior |
| 1009 | * of the requester process in otherwise impossible ways. For example |
| 1010 | * it can delay the operation for arbitrary length of time allowing |
| 1011 | * DoS against the requester. |
| 1012 | * |
| 1013 | * For this reason only those processes can call into the filesystem, |
| 1014 | * for which the owner of the mount has ptrace privilege. This |
| 1015 | * excludes processes started by other users, suid or sgid processes. |
| 1016 | */ |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1017 | int fuse_allow_current_process(struct fuse_conn *fc) |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1018 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1019 | const struct cred *cred; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1020 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1021 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 1022 | return 1; |
| 1023 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1024 | cred = current_cred(); |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1025 | if (uid_eq(cred->euid, fc->user_id) && |
| 1026 | uid_eq(cred->suid, fc->user_id) && |
| 1027 | uid_eq(cred->uid, fc->user_id) && |
| 1028 | gid_eq(cred->egid, fc->group_id) && |
| 1029 | gid_eq(cred->sgid, fc->group_id) && |
| 1030 | gid_eq(cred->gid, fc->group_id)) |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1031 | return 1; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1032 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1033 | return 0; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1036 | static int fuse_access(struct inode *inode, int mask) |
| 1037 | { |
| 1038 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1039 | FUSE_ARGS(args); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1040 | struct fuse_access_in inarg; |
| 1041 | int err; |
| 1042 | |
Miklos Szeredi | 698fa1d | 2013-10-01 16:41:23 +0200 | [diff] [blame] | 1043 | BUG_ON(mask & MAY_NOT_BLOCK); |
| 1044 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1045 | if (fc->no_access) |
| 1046 | return 0; |
| 1047 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1048 | memset(&inarg, 0, sizeof(inarg)); |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 1049 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1050 | args.in.h.opcode = FUSE_ACCESS; |
| 1051 | args.in.h.nodeid = get_node_id(inode); |
| 1052 | args.in.numargs = 1; |
| 1053 | args.in.args[0].size = sizeof(inarg); |
| 1054 | args.in.args[0].value = &inarg; |
| 1055 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1056 | if (err == -ENOSYS) { |
| 1057 | fc->no_access = 1; |
| 1058 | err = 0; |
| 1059 | } |
| 1060 | return err; |
| 1061 | } |
| 1062 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1063 | static int fuse_perm_getattr(struct inode *inode, int mask) |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1064 | { |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1065 | if (mask & MAY_NOT_BLOCK) |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1066 | return -ECHILD; |
| 1067 | |
| 1068 | return fuse_do_getattr(inode, NULL, NULL); |
| 1069 | } |
| 1070 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1071 | /* |
| 1072 | * Check permission. The two basic access models of FUSE are: |
| 1073 | * |
| 1074 | * 1) Local access checking ('default_permissions' mount option) based |
| 1075 | * on file mode. This is the plain old disk filesystem permission |
| 1076 | * modell. |
| 1077 | * |
| 1078 | * 2) "Remote" access checking, where server is responsible for |
| 1079 | * checking permission in each inode operation. An exception to this |
| 1080 | * is if ->permission() was invoked from sys_access() in which case an |
| 1081 | * access request is sent. Execute permission is still checked |
| 1082 | * locally based on file mode. |
| 1083 | */ |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1084 | static int fuse_permission(struct inode *inode, int mask) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1085 | { |
| 1086 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1087 | bool refreshed = false; |
| 1088 | int err = 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1089 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1090 | if (!fuse_allow_current_process(fc)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1091 | return -EACCES; |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1092 | |
| 1093 | /* |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1094 | * If attributes are needed, refresh them before proceeding |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1095 | */ |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1096 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
| 1097 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1098 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1099 | |
Miklos Szeredi | 126b9d4 | 2014-07-07 15:28:50 +0200 | [diff] [blame] | 1100 | if (time_before64(fi->i_time, get_jiffies_64())) { |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1101 | refreshed = true; |
| 1102 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1103 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1104 | if (err) |
| 1105 | return err; |
| 1106 | } |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 1110 | err = generic_permission(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1111 | |
| 1112 | /* If permission is denied, try to refresh file |
| 1113 | attributes. This is also needed, because the root |
| 1114 | node will at first have no permissions */ |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1115 | if (err == -EACCES && !refreshed) { |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1116 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1117 | if (!err) |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 1118 | err = generic_permission(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1119 | } |
| 1120 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1121 | /* Note: the opposite of the above test does not |
| 1122 | exist. So if permissions are revoked this won't be |
| 1123 | noticed immediately, only after the attribute |
| 1124 | timeout has expired */ |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 1125 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1126 | err = fuse_access(inode, mask); |
| 1127 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { |
| 1128 | if (!(inode->i_mode & S_IXUGO)) { |
| 1129 | if (refreshed) |
| 1130 | return -EACCES; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1131 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1132 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1133 | if (!err && !(inode->i_mode & S_IXUGO)) |
| 1134 | return -EACCES; |
| 1135 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1136 | } |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1137 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1138 | } |
| 1139 | |
| 1140 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1141 | struct dir_context *ctx) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1142 | { |
| 1143 | while (nbytes >= FUSE_NAME_OFFSET) { |
| 1144 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; |
| 1145 | size_t reclen = FUSE_DIRENT_SIZE(dirent); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1146 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 1147 | return -EIO; |
| 1148 | if (reclen > nbytes) |
| 1149 | break; |
Miklos Szeredi | efeb9e6 | 2013-09-03 14:28:38 +0200 | [diff] [blame] | 1150 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
| 1151 | return -EIO; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1152 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1153 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
| 1154 | dirent->ino, dirent->type)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1155 | break; |
| 1156 | |
| 1157 | buf += reclen; |
| 1158 | nbytes -= reclen; |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1159 | ctx->pos = dirent->off; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1160 | } |
| 1161 | |
| 1162 | return 0; |
| 1163 | } |
| 1164 | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1165 | static int fuse_direntplus_link(struct file *file, |
| 1166 | struct fuse_direntplus *direntplus, |
| 1167 | u64 attr_version) |
| 1168 | { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1169 | struct fuse_entry_out *o = &direntplus->entry_out; |
| 1170 | struct fuse_dirent *dirent = &direntplus->dirent; |
| 1171 | struct dentry *parent = file->f_path.dentry; |
| 1172 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); |
| 1173 | struct dentry *dentry; |
| 1174 | struct dentry *alias; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1175 | struct inode *dir = d_inode(parent); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1176 | struct fuse_conn *fc; |
| 1177 | struct inode *inode; |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1178 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1179 | |
| 1180 | if (!o->nodeid) { |
| 1181 | /* |
| 1182 | * Unlike in the case of fuse_lookup, zero nodeid does not mean |
| 1183 | * ENOENT. Instead, it only means the userspace filesystem did |
| 1184 | * not want to return attributes/handle for this entry. |
| 1185 | * |
| 1186 | * So do nothing. |
| 1187 | */ |
| 1188 | return 0; |
| 1189 | } |
| 1190 | |
| 1191 | if (name.name[0] == '.') { |
| 1192 | /* |
| 1193 | * We could potentially refresh the attributes of the directory |
| 1194 | * and its parent? |
| 1195 | */ |
| 1196 | if (name.len == 1) |
| 1197 | return 0; |
| 1198 | if (name.name[1] == '.' && name.len == 2) |
| 1199 | return 0; |
| 1200 | } |
Miklos Szeredi | a28ef45 | 2013-07-17 14:53:53 +0200 | [diff] [blame] | 1201 | |
| 1202 | if (invalid_nodeid(o->nodeid)) |
| 1203 | return -EIO; |
| 1204 | if (!fuse_valid_type(o->attr.mode)) |
| 1205 | return -EIO; |
| 1206 | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1207 | fc = get_fuse_conn(dir); |
| 1208 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 1209 | name.hash = full_name_hash(parent, name.name, name.len); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1210 | dentry = d_lookup(parent, &name); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1211 | if (!dentry) { |
| 1212 | retry: |
| 1213 | dentry = d_alloc_parallel(parent, &name, &wq); |
| 1214 | if (IS_ERR(dentry)) |
| 1215 | return PTR_ERR(dentry); |
| 1216 | } |
| 1217 | if (!d_in_lookup(dentry)) { |
| 1218 | struct fuse_inode *fi; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1219 | inode = d_inode(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1220 | if (!inode || |
| 1221 | get_node_id(inode) != o->nodeid || |
| 1222 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { |
Eric W. Biederman | 5542aa2 | 2014-02-13 09:46:25 -0800 | [diff] [blame] | 1223 | d_invalidate(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1224 | dput(dentry); |
| 1225 | goto retry; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1226 | } |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1227 | if (is_bad_inode(inode)) { |
| 1228 | dput(dentry); |
| 1229 | return -EIO; |
| 1230 | } |
| 1231 | |
| 1232 | fi = get_fuse_inode(inode); |
| 1233 | spin_lock(&fc->lock); |
| 1234 | fi->nlookup++; |
| 1235 | spin_unlock(&fc->lock); |
| 1236 | |
| 1237 | fuse_change_attributes(inode, &o->attr, |
| 1238 | entry_attr_timeout(o), |
| 1239 | attr_version); |
| 1240 | /* |
| 1241 | * The other branch comes via fuse_iget() |
| 1242 | * which bumps nlookup inside |
| 1243 | */ |
| 1244 | } else { |
| 1245 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, |
| 1246 | &o->attr, entry_attr_timeout(o), |
| 1247 | attr_version); |
| 1248 | if (!inode) |
| 1249 | inode = ERR_PTR(-ENOMEM); |
| 1250 | |
| 1251 | alias = d_splice_alias(inode, dentry); |
| 1252 | d_lookup_done(dentry); |
| 1253 | if (alias) { |
| 1254 | dput(dentry); |
| 1255 | dentry = alias; |
| 1256 | } |
| 1257 | if (IS_ERR(dentry)) |
| 1258 | return PTR_ERR(dentry); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1259 | } |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 1260 | if (fc->readdirplus_auto) |
| 1261 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1262 | fuse_change_entry_timeout(dentry, o); |
| 1263 | |
Miklos Szeredi | c7263bc | 2013-07-17 14:53:54 +0200 | [diff] [blame] | 1264 | dput(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1265 | return 0; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1266 | } |
| 1267 | |
| 1268 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1269 | struct dir_context *ctx, u64 attr_version) |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1270 | { |
| 1271 | struct fuse_direntplus *direntplus; |
| 1272 | struct fuse_dirent *dirent; |
| 1273 | size_t reclen; |
| 1274 | int over = 0; |
| 1275 | int ret; |
| 1276 | |
| 1277 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { |
| 1278 | direntplus = (struct fuse_direntplus *) buf; |
| 1279 | dirent = &direntplus->dirent; |
| 1280 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); |
| 1281 | |
| 1282 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 1283 | return -EIO; |
| 1284 | if (reclen > nbytes) |
| 1285 | break; |
Miklos Szeredi | efeb9e6 | 2013-09-03 14:28:38 +0200 | [diff] [blame] | 1286 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
| 1287 | return -EIO; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1288 | |
| 1289 | if (!over) { |
| 1290 | /* We fill entries into dstbuf only as much as |
| 1291 | it can hold. But we still continue iterating |
| 1292 | over remaining entries to link them. If not, |
| 1293 | we need to send a FORGET for each of those |
| 1294 | which we did not link. |
| 1295 | */ |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1296 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
| 1297 | dirent->ino, dirent->type); |
| 1298 | ctx->pos = dirent->off; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1299 | } |
| 1300 | |
| 1301 | buf += reclen; |
| 1302 | nbytes -= reclen; |
| 1303 | |
| 1304 | ret = fuse_direntplus_link(file, direntplus, attr_version); |
| 1305 | if (ret) |
| 1306 | fuse_force_forget(file, direntplus->entry_out.nodeid); |
| 1307 | } |
| 1308 | |
| 1309 | return 0; |
| 1310 | } |
| 1311 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1312 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1313 | { |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1314 | int plus, err; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1315 | size_t nbytes; |
| 1316 | struct page *page; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1317 | struct inode *inode = file_inode(file); |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1318 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 248d86e | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1319 | struct fuse_req *req; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1320 | u64 attr_version = 0; |
Miklos Szeredi | 248d86e | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1321 | |
| 1322 | if (is_bad_inode(inode)) |
| 1323 | return -EIO; |
| 1324 | |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 1325 | req = fuse_get_req(fc, 1); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1326 | if (IS_ERR(req)) |
| 1327 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1328 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1329 | page = alloc_page(GFP_KERNEL); |
| 1330 | if (!page) { |
| 1331 | fuse_put_request(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1332 | return -ENOMEM; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1333 | } |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1334 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1335 | plus = fuse_use_readdirplus(inode, ctx); |
Miklos Szeredi | f4975c6 | 2009-04-02 14:25:34 +0200 | [diff] [blame] | 1336 | req->out.argpages = 1; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1337 | req->num_pages = 1; |
| 1338 | req->pages[0] = page; |
Maxim Patlasov | 85f40ae | 2012-10-26 19:49:33 +0400 | [diff] [blame] | 1339 | req->page_descs[0].length = PAGE_SIZE; |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1340 | if (plus) { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1341 | attr_version = fuse_get_attr_version(fc); |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1342 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1343 | FUSE_READDIRPLUS); |
| 1344 | } else { |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1345 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1346 | FUSE_READDIR); |
| 1347 | } |
Miklos Szeredi | 5c672ab | 2016-06-30 13:10:49 +0200 | [diff] [blame] | 1348 | fuse_lock_inode(inode); |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1349 | fuse_request_send(fc, req); |
Miklos Szeredi | 5c672ab | 2016-06-30 13:10:49 +0200 | [diff] [blame] | 1350 | fuse_unlock_inode(inode); |
Miklos Szeredi | 361b1eb5 | 2006-01-16 22:14:45 -0800 | [diff] [blame] | 1351 | nbytes = req->out.args[0].size; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1352 | err = req->out.h.error; |
| 1353 | fuse_put_request(fc, req); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1354 | if (!err) { |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1355 | if (plus) { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1356 | err = parse_dirplusfile(page_address(page), nbytes, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1357 | file, ctx, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1358 | attr_version); |
| 1359 | } else { |
| 1360 | err = parse_dirfile(page_address(page), nbytes, file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1361 | ctx); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1362 | } |
| 1363 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1364 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1365 | __free_page(page); |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 1366 | fuse_invalidate_atime(inode); |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1367 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1368 | } |
| 1369 | |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1370 | static const char *fuse_get_link(struct dentry *dentry, |
Al Viro | fceef39 | 2015-12-29 15:58:39 -0500 | [diff] [blame] | 1371 | struct inode *inode, |
| 1372 | struct delayed_call *done) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1373 | { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1374 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1375 | FUSE_ARGS(args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1376 | char *link; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1377 | ssize_t ret; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1378 | |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1379 | if (!dentry) |
| 1380 | return ERR_PTR(-ECHILD); |
| 1381 | |
Al Viro | cd3417c | 2015-12-29 16:03:53 -0500 | [diff] [blame] | 1382 | link = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1383 | if (!link) |
| 1384 | return ERR_PTR(-ENOMEM); |
| 1385 | |
| 1386 | args.in.h.opcode = FUSE_READLINK; |
| 1387 | args.in.h.nodeid = get_node_id(inode); |
| 1388 | args.out.argvar = 1; |
| 1389 | args.out.numargs = 1; |
| 1390 | args.out.args[0].size = PAGE_SIZE - 1; |
| 1391 | args.out.args[0].value = link; |
| 1392 | ret = fuse_simple_request(fc, &args); |
| 1393 | if (ret < 0) { |
Al Viro | cd3417c | 2015-12-29 16:03:53 -0500 | [diff] [blame] | 1394 | kfree(link); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1395 | link = ERR_PTR(ret); |
| 1396 | } else { |
| 1397 | link[ret] = '\0'; |
Al Viro | fceef39 | 2015-12-29 15:58:39 -0500 | [diff] [blame] | 1398 | set_delayed_call(done, kfree_link, link); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1399 | } |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 1400 | fuse_invalidate_atime(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1401 | return link; |
| 1402 | } |
| 1403 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1404 | static int fuse_dir_open(struct inode *inode, struct file *file) |
| 1405 | { |
Miklos Szeredi | 91fe96b | 2009-04-28 16:56:37 +0200 | [diff] [blame] | 1406 | return fuse_open_common(inode, file, true); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1407 | } |
| 1408 | |
| 1409 | static int fuse_dir_release(struct inode *inode, struct file *file) |
| 1410 | { |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 1411 | fuse_release_common(file, FUSE_RELEASEDIR); |
| 1412 | |
| 1413 | return 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1414 | } |
| 1415 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1416 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
| 1417 | int datasync) |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1418 | { |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1419 | return fuse_fsync_common(file, start, end, datasync, 1); |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1420 | } |
| 1421 | |
Miklos Szeredi | b18da0c | 2011-12-13 11:58:49 +0100 | [diff] [blame] | 1422 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
| 1423 | unsigned long arg) |
| 1424 | { |
| 1425 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); |
| 1426 | |
| 1427 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ |
| 1428 | if (fc->minor < 18) |
| 1429 | return -ENOTTY; |
| 1430 | |
| 1431 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); |
| 1432 | } |
| 1433 | |
| 1434 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, |
| 1435 | unsigned long arg) |
| 1436 | { |
| 1437 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); |
| 1438 | |
| 1439 | if (fc->minor < 18) |
| 1440 | return -ENOTTY; |
| 1441 | |
| 1442 | return fuse_ioctl_common(file, cmd, arg, |
| 1443 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); |
| 1444 | } |
| 1445 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1446 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1447 | { |
| 1448 | /* Always update if mtime is explicitly set */ |
| 1449 | if (ivalid & ATTR_MTIME_SET) |
| 1450 | return true; |
| 1451 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1452 | /* Or if kernel i_mtime is the official one */ |
| 1453 | if (trust_local_mtime) |
| 1454 | return true; |
| 1455 | |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1456 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
| 1457 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) |
| 1458 | return false; |
| 1459 | |
| 1460 | /* In all other cases update */ |
| 1461 | return true; |
| 1462 | } |
| 1463 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1464 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1465 | bool trust_local_cmtime) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1466 | { |
| 1467 | unsigned ivalid = iattr->ia_valid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1468 | |
| 1469 | if (ivalid & ATTR_MODE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1470 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1471 | if (ivalid & ATTR_UID) |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1472 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1473 | if (ivalid & ATTR_GID) |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1474 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1475 | if (ivalid & ATTR_SIZE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1476 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1477 | if (ivalid & ATTR_ATIME) { |
| 1478 | arg->valid |= FATTR_ATIME; |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1479 | arg->atime = iattr->ia_atime.tv_sec; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1480 | arg->atimensec = iattr->ia_atime.tv_nsec; |
| 1481 | if (!(ivalid & ATTR_ATIME_SET)) |
| 1482 | arg->valid |= FATTR_ATIME_NOW; |
| 1483 | } |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1484 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1485 | arg->valid |= FATTR_MTIME; |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1486 | arg->mtime = iattr->ia_mtime.tv_sec; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1487 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1488 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1489 | arg->valid |= FATTR_MTIME_NOW; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1490 | } |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1491 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
| 1492 | arg->valid |= FATTR_CTIME; |
| 1493 | arg->ctime = iattr->ia_ctime.tv_sec; |
| 1494 | arg->ctimensec = iattr->ia_ctime.tv_nsec; |
| 1495 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1496 | } |
| 1497 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1498 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1499 | * Prevent concurrent writepages on inode |
| 1500 | * |
| 1501 | * This is done by adding a negative bias to the inode write counter |
| 1502 | * and waiting for all pending writes to finish. |
| 1503 | */ |
| 1504 | void fuse_set_nowrite(struct inode *inode) |
| 1505 | { |
| 1506 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1507 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1508 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1509 | BUG_ON(!inode_is_locked(inode)); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1510 | |
| 1511 | spin_lock(&fc->lock); |
| 1512 | BUG_ON(fi->writectr < 0); |
| 1513 | fi->writectr += FUSE_NOWRITE; |
| 1514 | spin_unlock(&fc->lock); |
| 1515 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
| 1516 | } |
| 1517 | |
| 1518 | /* |
| 1519 | * Allow writepages on inode |
| 1520 | * |
| 1521 | * Remove the bias from the writecounter and send any queued |
| 1522 | * writepages. |
| 1523 | */ |
| 1524 | static void __fuse_release_nowrite(struct inode *inode) |
| 1525 | { |
| 1526 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1527 | |
| 1528 | BUG_ON(fi->writectr != FUSE_NOWRITE); |
| 1529 | fi->writectr = 0; |
| 1530 | fuse_flush_writepages(inode); |
| 1531 | } |
| 1532 | |
| 1533 | void fuse_release_nowrite(struct inode *inode) |
| 1534 | { |
| 1535 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1536 | |
| 1537 | spin_lock(&fc->lock); |
| 1538 | __fuse_release_nowrite(inode); |
| 1539 | spin_unlock(&fc->lock); |
| 1540 | } |
| 1541 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1542 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1543 | struct inode *inode, |
| 1544 | struct fuse_setattr_in *inarg_p, |
| 1545 | struct fuse_attr_out *outarg_p) |
| 1546 | { |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1547 | args->in.h.opcode = FUSE_SETATTR; |
| 1548 | args->in.h.nodeid = get_node_id(inode); |
| 1549 | args->in.numargs = 1; |
| 1550 | args->in.args[0].size = sizeof(*inarg_p); |
| 1551 | args->in.args[0].value = inarg_p; |
| 1552 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 1553 | args->out.args[0].size = sizeof(*outarg_p); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1554 | args->out.args[0].value = outarg_p; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1555 | } |
| 1556 | |
| 1557 | /* |
| 1558 | * Flush inode->i_mtime to the server |
| 1559 | */ |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1560 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1561 | { |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1562 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1563 | FUSE_ARGS(args); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1564 | struct fuse_setattr_in inarg; |
| 1565 | struct fuse_attr_out outarg; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1566 | |
| 1567 | memset(&inarg, 0, sizeof(inarg)); |
| 1568 | memset(&outarg, 0, sizeof(outarg)); |
| 1569 | |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1570 | inarg.valid = FATTR_MTIME; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1571 | inarg.mtime = inode->i_mtime.tv_sec; |
| 1572 | inarg.mtimensec = inode->i_mtime.tv_nsec; |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1573 | if (fc->minor >= 23) { |
| 1574 | inarg.valid |= FATTR_CTIME; |
| 1575 | inarg.ctime = inode->i_ctime.tv_sec; |
| 1576 | inarg.ctimensec = inode->i_ctime.tv_nsec; |
| 1577 | } |
Miklos Szeredi | 1e18bda | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 1578 | if (ff) { |
| 1579 | inarg.valid |= FATTR_FH; |
| 1580 | inarg.fh = ff->fh; |
| 1581 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1582 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1583 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1584 | return fuse_simple_request(fc, &args); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1585 | } |
| 1586 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1587 | /* |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1588 | * Set attributes, and at the same time refresh them. |
| 1589 | * |
| 1590 | * Truncation is slightly complicated, because the 'truncate' request |
| 1591 | * may fail, in which case we don't want to touch the mapping. |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 1592 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
| 1593 | * and the actual truncation by hand. |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1594 | */ |
Maxim Patlasov | efb9fa9 | 2012-12-18 14:05:08 +0400 | [diff] [blame] | 1595 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
| 1596 | struct file *file) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1597 | { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1598 | struct fuse_conn *fc = get_fuse_conn(inode); |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1599 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1600 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1601 | struct fuse_setattr_in inarg; |
| 1602 | struct fuse_attr_out outarg; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1603 | bool is_truncate = false; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1604 | bool is_wb = fc->writeback_cache; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1605 | loff_t oldsize; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1606 | int err; |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1607 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1608 | |
Christoph Hellwig | db78b87 | 2010-06-04 11:30:03 +0200 | [diff] [blame] | 1609 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
| 1610 | attr->ia_valid |= ATTR_FORCE; |
| 1611 | |
| 1612 | err = inode_change_ok(inode, attr); |
| 1613 | if (err) |
| 1614 | return err; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1615 | |
Miklos Szeredi | 8d56add | 2011-02-25 14:44:58 +0100 | [diff] [blame] | 1616 | if (attr->ia_valid & ATTR_OPEN) { |
| 1617 | if (fc->atomic_o_trunc) |
| 1618 | return 0; |
| 1619 | file = NULL; |
| 1620 | } |
Miklos Szeredi | 6ff958e | 2007-10-18 03:07:02 -0700 | [diff] [blame] | 1621 | |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 1622 | if (attr->ia_valid & ATTR_SIZE) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1623 | is_truncate = true; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1624 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1625 | if (is_truncate) { |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1626 | fuse_set_nowrite(inode); |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1627 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1628 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
| 1629 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1630 | } |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1631 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1632 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 1633 | memset(&outarg, 0, sizeof(outarg)); |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1634 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1635 | if (file) { |
| 1636 | struct fuse_file *ff = file->private_data; |
| 1637 | inarg.valid |= FATTR_FH; |
| 1638 | inarg.fh = ff->fh; |
| 1639 | } |
Miklos Szeredi | f333211 | 2007-10-18 03:07:04 -0700 | [diff] [blame] | 1640 | if (attr->ia_valid & ATTR_SIZE) { |
| 1641 | /* For mandatory locking in truncate */ |
| 1642 | inarg.valid |= FATTR_LOCKOWNER; |
| 1643 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); |
| 1644 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1645 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
| 1646 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1647 | if (err) { |
| 1648 | if (err == -EINTR) |
| 1649 | fuse_invalidate_attr(inode); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1650 | goto error; |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1651 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1652 | |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1653 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
| 1654 | make_bad_inode(inode); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1655 | err = -EIO; |
| 1656 | goto error; |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1657 | } |
| 1658 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1659 | spin_lock(&fc->lock); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1660 | /* the kernel maintains i_mtime locally */ |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1661 | if (trust_local_cmtime) { |
| 1662 | if (attr->ia_valid & ATTR_MTIME) |
| 1663 | inode->i_mtime = attr->ia_mtime; |
| 1664 | if (attr->ia_valid & ATTR_CTIME) |
| 1665 | inode->i_ctime = attr->ia_ctime; |
Miklos Szeredi | 1e18bda | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 1666 | /* FIXME: clear I_DIRTY_SYNC? */ |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1667 | } |
| 1668 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1669 | fuse_change_attributes_common(inode, &outarg.attr, |
| 1670 | attr_timeout(&outarg)); |
| 1671 | oldsize = inode->i_size; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1672 | /* see the comment in fuse_change_attributes() */ |
| 1673 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) |
| 1674 | i_size_write(inode, outarg.attr.size); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1675 | |
| 1676 | if (is_truncate) { |
| 1677 | /* NOTE: this may release/reacquire fc->lock */ |
| 1678 | __fuse_release_nowrite(inode); |
| 1679 | } |
| 1680 | spin_unlock(&fc->lock); |
| 1681 | |
| 1682 | /* |
| 1683 | * Only call invalidate_inode_pages2() after removing |
| 1684 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. |
| 1685 | */ |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1686 | if ((is_truncate || !is_wb) && |
| 1687 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 1688 | truncate_pagecache(inode, outarg.attr.size); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1689 | invalidate_inode_pages2(inode->i_mapping); |
| 1690 | } |
| 1691 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1692 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1693 | return 0; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1694 | |
| 1695 | error: |
| 1696 | if (is_truncate) |
| 1697 | fuse_release_nowrite(inode); |
| 1698 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1699 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1700 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1701 | } |
| 1702 | |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1703 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
| 1704 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1705 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame^] | 1706 | int ret; |
Maxim Patlasov | efb9fa9 | 2012-12-18 14:05:08 +0400 | [diff] [blame] | 1707 | |
| 1708 | if (!fuse_allow_current_process(get_fuse_conn(inode))) |
| 1709 | return -EACCES; |
| 1710 | |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1711 | if (attr->ia_valid & ATTR_FILE) |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame^] | 1712 | ret = fuse_do_setattr(inode, attr, attr->ia_file); |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1713 | else |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame^] | 1714 | ret = fuse_do_setattr(inode, attr, NULL); |
| 1715 | |
| 1716 | if (!ret) { |
| 1717 | /* Directory mode changed, may need to revalidate access */ |
| 1718 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) |
| 1719 | fuse_invalidate_entry_cache(entry); |
| 1720 | } |
| 1721 | return ret; |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1722 | } |
| 1723 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1724 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
| 1725 | struct kstat *stat) |
| 1726 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1727 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1728 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1729 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1730 | if (!fuse_allow_current_process(fc)) |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1731 | return -EACCES; |
| 1732 | |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 1733 | return fuse_update_attributes(inode, stat, NULL, NULL); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1734 | } |
| 1735 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1736 | static const struct inode_operations fuse_dir_inode_operations = { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1737 | .lookup = fuse_lookup, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1738 | .mkdir = fuse_mkdir, |
| 1739 | .symlink = fuse_symlink, |
| 1740 | .unlink = fuse_unlink, |
| 1741 | .rmdir = fuse_rmdir, |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 1742 | .rename2 = fuse_rename2, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1743 | .link = fuse_link, |
| 1744 | .setattr = fuse_setattr, |
| 1745 | .create = fuse_create, |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 1746 | .atomic_open = fuse_atomic_open, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1747 | .mknod = fuse_mknod, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1748 | .permission = fuse_permission, |
| 1749 | .getattr = fuse_getattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1750 | .setxattr = generic_setxattr, |
| 1751 | .getxattr = generic_getxattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1752 | .listxattr = fuse_listxattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1753 | .removexattr = generic_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1754 | }; |
| 1755 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1756 | static const struct file_operations fuse_dir_operations = { |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 1757 | .llseek = generic_file_llseek, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1758 | .read = generic_read_dir, |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1759 | .iterate_shared = fuse_readdir, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1760 | .open = fuse_dir_open, |
| 1761 | .release = fuse_dir_release, |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1762 | .fsync = fuse_dir_fsync, |
Miklos Szeredi | b18da0c | 2011-12-13 11:58:49 +0100 | [diff] [blame] | 1763 | .unlocked_ioctl = fuse_dir_ioctl, |
| 1764 | .compat_ioctl = fuse_dir_compat_ioctl, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1765 | }; |
| 1766 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1767 | static const struct inode_operations fuse_common_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1768 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1769 | .permission = fuse_permission, |
| 1770 | .getattr = fuse_getattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1771 | .setxattr = generic_setxattr, |
| 1772 | .getxattr = generic_getxattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1773 | .listxattr = fuse_listxattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1774 | .removexattr = generic_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1775 | }; |
| 1776 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1777 | static const struct inode_operations fuse_symlink_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1778 | .setattr = fuse_setattr, |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1779 | .get_link = fuse_get_link, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1780 | .readlink = generic_readlink, |
| 1781 | .getattr = fuse_getattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1782 | .setxattr = generic_setxattr, |
| 1783 | .getxattr = generic_getxattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1784 | .listxattr = fuse_listxattr, |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 1785 | .removexattr = generic_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1786 | }; |
| 1787 | |
| 1788 | void fuse_init_common(struct inode *inode) |
| 1789 | { |
| 1790 | inode->i_op = &fuse_common_inode_operations; |
| 1791 | } |
| 1792 | |
| 1793 | void fuse_init_dir(struct inode *inode) |
| 1794 | { |
| 1795 | inode->i_op = &fuse_dir_inode_operations; |
| 1796 | inode->i_fop = &fuse_dir_operations; |
| 1797 | } |
| 1798 | |
| 1799 | void fuse_init_symlink(struct inode *inode) |
| 1800 | { |
| 1801 | inode->i_op = &fuse_symlink_inode_operations; |
| 1802 | } |