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> |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 17 | #include <linux/posix_acl.h> |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 18 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 19 | static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 20 | { |
| 21 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 22 | struct fuse_inode *fi = get_fuse_inode(dir); |
| 23 | |
| 24 | if (!fc->do_readdirplus) |
| 25 | return false; |
Eric Wong | 634734b | 2013-02-06 22:29:01 +0000 | [diff] [blame] | 26 | if (!fc->readdirplus_auto) |
| 27 | return true; |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 28 | if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state)) |
| 29 | return true; |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 30 | if (ctx->pos == 0) |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 31 | return true; |
| 32 | return false; |
| 33 | } |
| 34 | |
| 35 | static void fuse_advise_use_readdirplus(struct inode *dir) |
| 36 | { |
| 37 | struct fuse_inode *fi = get_fuse_inode(dir); |
| 38 | |
| 39 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); |
| 40 | } |
| 41 | |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 42 | union fuse_dentry { |
| 43 | u64 time; |
| 44 | struct rcu_head rcu; |
| 45 | }; |
| 46 | |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 47 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) |
| 48 | { |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 49 | ((union fuse_dentry *) entry->d_fsdata)->time = time; |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | static inline u64 fuse_dentry_time(struct dentry *entry) |
| 53 | { |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 54 | return ((union fuse_dentry *) entry->d_fsdata)->time; |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 55 | } |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 56 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 57 | /* |
| 58 | * FUSE caches dentries and attributes with separate timeout. The |
| 59 | * time in jiffies until the dentry/attributes are valid is stored in |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 60 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 61 | */ |
| 62 | |
| 63 | /* |
| 64 | * Calculate the time in jiffies until a dentry/attributes are valid |
| 65 | */ |
Miklos Szeredi | bcb6f6d | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 66 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 67 | { |
Miklos Szeredi | 685d16d | 2006-07-30 03:04:08 -0700 | [diff] [blame] | 68 | if (sec || nsec) { |
Miklos Szeredi | bcb6f6d | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 69 | struct timespec64 ts = { |
| 70 | sec, |
David Sheets | 07f0267 | 2017-01-13 15:58:30 +0000 | [diff] [blame] | 71 | min_t(u32, nsec, NSEC_PER_SEC - 1) |
Miklos Szeredi | bcb6f6d | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 72 | }; |
| 73 | |
| 74 | return get_jiffies_64() + timespec64_to_jiffies(&ts); |
Miklos Szeredi | 685d16d | 2006-07-30 03:04:08 -0700 | [diff] [blame] | 75 | } else |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 76 | return 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 79 | /* |
| 80 | * Set dentry and possibly attribute timeouts from the lookup/mk* |
| 81 | * replies |
| 82 | */ |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 83 | static void fuse_change_entry_timeout(struct dentry *entry, |
| 84 | struct fuse_entry_out *o) |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 85 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 86 | fuse_dentry_settime(entry, |
| 87 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static u64 attr_timeout(struct fuse_attr_out *o) |
| 91 | { |
| 92 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); |
| 93 | } |
| 94 | |
| 95 | static u64 entry_attr_timeout(struct fuse_entry_out *o) |
| 96 | { |
| 97 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 98 | } |
| 99 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 100 | /* |
| 101 | * Mark the attributes as stale, so that at the next call to |
| 102 | * ->getattr() they will be fetched from userspace |
| 103 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 104 | void fuse_invalidate_attr(struct inode *inode) |
| 105 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 106 | get_fuse_inode(inode)->i_time = 0; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 107 | } |
| 108 | |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 109 | /** |
| 110 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if |
| 111 | * atime is not used. |
| 112 | */ |
| 113 | void fuse_invalidate_atime(struct inode *inode) |
| 114 | { |
| 115 | if (!IS_RDONLY(inode)) |
| 116 | fuse_invalidate_attr(inode); |
| 117 | } |
| 118 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 119 | /* |
| 120 | * Just mark the entry as stale, so that a next attempt to look it up |
| 121 | * will result in a new lookup call to userspace |
| 122 | * |
| 123 | * This is called when a dentry is about to become negative and the |
| 124 | * timeout is unknown (unlink, rmdir, rename and in some cases |
| 125 | * lookup) |
| 126 | */ |
Miklos Szeredi | dbd561d | 2008-07-25 01:49:00 -0700 | [diff] [blame] | 127 | void fuse_invalidate_entry_cache(struct dentry *entry) |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 128 | { |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 129 | fuse_dentry_settime(entry, 0); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 130 | } |
| 131 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 132 | /* |
| 133 | * Same as fuse_invalidate_entry_cache(), but also try to remove the |
| 134 | * dentry from the hash |
| 135 | */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 136 | static void fuse_invalidate_entry(struct dentry *entry) |
| 137 | { |
| 138 | d_invalidate(entry); |
| 139 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 140 | } |
| 141 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 142 | 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] | 143 | u64 nodeid, const struct qstr *name, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 144 | struct fuse_entry_out *outarg) |
| 145 | { |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 146 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 147 | args->in.h.opcode = FUSE_LOOKUP; |
| 148 | args->in.h.nodeid = nodeid; |
| 149 | args->in.numargs = 1; |
| 150 | args->in.args[0].size = name->len + 1; |
| 151 | args->in.args[0].value = name->name; |
| 152 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 153 | args->out.args[0].size = sizeof(struct fuse_entry_out); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 154 | args->out.args[0].value = outarg; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 155 | } |
| 156 | |
Miklos Szeredi | 5c5c5e5 | 2008-04-30 00:54:43 -0700 | [diff] [blame] | 157 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 158 | { |
| 159 | u64 curr_version; |
| 160 | |
| 161 | /* |
| 162 | * The spin lock isn't actually needed on 64bit archs, but we |
| 163 | * don't yet care too much about such optimizations. |
| 164 | */ |
| 165 | spin_lock(&fc->lock); |
| 166 | curr_version = fc->attr_version; |
| 167 | spin_unlock(&fc->lock); |
| 168 | |
| 169 | return curr_version; |
| 170 | } |
| 171 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 172 | /* |
| 173 | * Check whether the dentry is still valid |
| 174 | * |
| 175 | * If the entry validity timeout has expired and the dentry is |
| 176 | * positive, try to redo the lookup. If the lookup results in a |
| 177 | * different inode, then let the VFS invalidate the dentry and redo |
| 178 | * the lookup once more. If the lookup results in the same inode, |
| 179 | * then refresh the attributes, timeouts and mark the dentry valid. |
| 180 | */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 181 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 182 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 183 | struct inode *inode; |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 184 | struct dentry *parent; |
| 185 | struct fuse_conn *fc; |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 186 | struct fuse_inode *fi; |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 187 | int ret; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 188 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 189 | inode = d_inode_rcu(entry); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 190 | if (inode && is_bad_inode(inode)) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 191 | goto invalid; |
Anand Avati | 154210c | 2014-06-26 20:21:57 -0400 | [diff] [blame] | 192 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
| 193 | (flags & LOOKUP_REVAL)) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 194 | struct fuse_entry_out outarg; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 195 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 196 | struct fuse_forget_link *forget; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 197 | u64 attr_version; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 198 | |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 199 | /* For negative dentries, always do a fresh lookup */ |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 200 | if (!inode) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 201 | goto invalid; |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 202 | |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 203 | ret = -ECHILD; |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 204 | if (flags & LOOKUP_RCU) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 205 | goto out; |
Miklos Szeredi | e7c0a16 | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 206 | |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 207 | fc = get_fuse_conn(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 208 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 209 | forget = fuse_alloc_forget(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 210 | ret = -ENOMEM; |
| 211 | if (!forget) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 212 | goto out; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 213 | |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 214 | attr_version = fuse_get_attr_version(fc); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 215 | |
Miklos Szeredi | e956edd | 2006-10-17 00:10:12 -0700 | [diff] [blame] | 216 | parent = dget_parent(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 217 | fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)), |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 218 | &entry->d_name, &outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 219 | ret = fuse_simple_request(fc, &args); |
Miklos Szeredi | e956edd | 2006-10-17 00:10:12 -0700 | [diff] [blame] | 220 | dput(parent); |
Miklos Szeredi | 50322fe | 2006-02-28 16:59:03 -0800 | [diff] [blame] | 221 | /* Zero nodeid is same as -ENOENT */ |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 222 | if (!ret && !outarg.nodeid) |
| 223 | ret = -ENOENT; |
| 224 | if (!ret) { |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 225 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 226 | if (outarg.nodeid != get_node_id(inode)) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 227 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 228 | goto invalid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 229 | } |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 230 | spin_lock(&fc->lock); |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 231 | fi->nlookup++; |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 232 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 233 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 234 | kfree(forget); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 235 | if (ret == -ENOMEM) |
| 236 | goto out; |
| 237 | if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 238 | goto invalid; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 239 | |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 240 | forget_all_cached_acls(inode); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 241 | fuse_change_attributes(inode, &outarg.attr, |
| 242 | entry_attr_timeout(&outarg), |
| 243 | attr_version); |
| 244 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 245 | } else if (inode) { |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 246 | fi = get_fuse_inode(inode); |
| 247 | if (flags & LOOKUP_RCU) { |
| 248 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) |
| 249 | return -ECHILD; |
| 250 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 251 | parent = dget_parent(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 252 | fuse_advise_use_readdirplus(d_inode(parent)); |
Miklos Szeredi | 28420da | 2013-06-03 14:40:22 +0200 | [diff] [blame] | 253 | dput(parent); |
| 254 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 255 | } |
Miklos Szeredi | e2a6b95 | 2013-09-05 11:44:43 +0200 | [diff] [blame] | 256 | ret = 1; |
| 257 | out: |
| 258 | return ret; |
| 259 | |
| 260 | invalid: |
| 261 | ret = 0; |
| 262 | goto out; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 265 | static int invalid_nodeid(u64 nodeid) |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 266 | { |
| 267 | return !nodeid || nodeid == FUSE_ROOT_ID; |
| 268 | } |
| 269 | |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 270 | static int fuse_dentry_init(struct dentry *dentry) |
| 271 | { |
| 272 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL); |
| 273 | |
| 274 | return dentry->d_fsdata ? 0 : -ENOMEM; |
| 275 | } |
| 276 | static void fuse_dentry_release(struct dentry *dentry) |
| 277 | { |
| 278 | union fuse_dentry *fd = dentry->d_fsdata; |
| 279 | |
| 280 | kfree_rcu(fd, rcu); |
| 281 | } |
| 282 | |
Al Viro | 4269590 | 2009-02-20 05:59:13 +0000 | [diff] [blame] | 283 | const struct dentry_operations fuse_dentry_operations = { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 284 | .d_revalidate = fuse_dentry_revalidate, |
Miklos Szeredi | f75fdf2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 285 | .d_init = fuse_dentry_init, |
| 286 | .d_release = fuse_dentry_release, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 287 | }; |
| 288 | |
Miklos Szeredi | 0ce267f | 2016-10-18 15:36:48 +0200 | [diff] [blame] | 289 | const struct dentry_operations fuse_root_dentry_operations = { |
| 290 | .d_init = fuse_dentry_init, |
| 291 | .d_release = fuse_dentry_release, |
| 292 | }; |
| 293 | |
Timo Savola | a5bfffac | 2007-04-08 16:04:00 -0700 | [diff] [blame] | 294 | int fuse_valid_type(int m) |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 295 | { |
| 296 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || |
| 297 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); |
| 298 | } |
| 299 | |
Al Viro | 13983d0 | 2016-07-20 22:34:44 -0400 | [diff] [blame] | 300 | 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] | 301 | struct fuse_entry_out *outarg, struct inode **inode) |
| 302 | { |
| 303 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 304 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 305 | struct fuse_forget_link *forget; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 306 | u64 attr_version; |
| 307 | int err; |
| 308 | |
| 309 | *inode = NULL; |
| 310 | err = -ENAMETOOLONG; |
| 311 | if (name->len > FUSE_NAME_MAX) |
| 312 | goto out; |
| 313 | |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 314 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 315 | forget = fuse_alloc_forget(); |
| 316 | err = -ENOMEM; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 317 | if (!forget) |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 318 | goto out; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 319 | |
| 320 | attr_version = fuse_get_attr_version(fc); |
| 321 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 322 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
| 323 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 324 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
| 325 | if (err || !outarg->nodeid) |
| 326 | goto out_put_forget; |
| 327 | |
| 328 | err = -EIO; |
| 329 | if (!outarg->nodeid) |
| 330 | goto out_put_forget; |
| 331 | if (!fuse_valid_type(outarg->attr.mode)) |
| 332 | goto out_put_forget; |
| 333 | |
| 334 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, |
| 335 | &outarg->attr, entry_attr_timeout(outarg), |
| 336 | attr_version); |
| 337 | err = -ENOMEM; |
| 338 | if (!*inode) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 339 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 340 | goto out; |
| 341 | } |
| 342 | err = 0; |
| 343 | |
| 344 | out_put_forget: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 345 | kfree(forget); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 346 | out: |
| 347 | return err; |
| 348 | } |
| 349 | |
Miklos Szeredi | 0aa7c69 | 2006-01-06 00:19:34 -0800 | [diff] [blame] | 350 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 351 | unsigned int flags) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 352 | { |
| 353 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 354 | struct fuse_entry_out outarg; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 355 | struct inode *inode; |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 356 | struct dentry *newent; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 357 | bool outarg_valid = true; |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 358 | bool locked; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 359 | |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 360 | locked = fuse_lock_inode(dir); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 361 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
| 362 | &outarg, &inode); |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 363 | fuse_unlock_inode(dir, locked); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 364 | if (err == -ENOENT) { |
| 365 | outarg_valid = false; |
| 366 | err = 0; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 367 | } |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 368 | if (err) |
| 369 | goto out_err; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 370 | |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 371 | err = -EIO; |
| 372 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) |
| 373 | goto out_iput; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 374 | |
Al Viro | 41d28bc | 2014-10-12 22:24:21 -0400 | [diff] [blame] | 375 | newent = d_splice_alias(inode, entry); |
Miklos Szeredi | 5835f33 | 2013-09-05 11:44:42 +0200 | [diff] [blame] | 376 | err = PTR_ERR(newent); |
| 377 | if (IS_ERR(newent)) |
| 378 | goto out_err; |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 379 | |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 380 | entry = newent ? newent : entry; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 381 | if (outarg_valid) |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 382 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 383 | else |
| 384 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 385 | |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 386 | fuse_advise_use_readdirplus(dir); |
Miklos Szeredi | 0de6256 | 2008-07-25 01:48:59 -0700 | [diff] [blame] | 387 | return newent; |
Miklos Szeredi | c180eeb | 2008-07-25 01:49:01 -0700 | [diff] [blame] | 388 | |
| 389 | out_iput: |
| 390 | iput(inode); |
| 391 | out_err: |
| 392 | return ERR_PTR(err); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 395 | /* |
| 396 | * Atomic create+open operation |
| 397 | * |
| 398 | * If the filesystem doesn't support this, then fall back to separate |
| 399 | * 'mknod' + 'open' requests. |
| 400 | */ |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 401 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 402 | struct file *file, unsigned flags, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 403 | umode_t mode, int *opened) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 404 | { |
| 405 | int err; |
| 406 | struct inode *inode; |
| 407 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 408 | FUSE_ARGS(args); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 409 | struct fuse_forget_link *forget; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 410 | struct fuse_create_in inarg; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 411 | struct fuse_open_out outopen; |
| 412 | struct fuse_entry_out outentry; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 413 | struct fuse_file *ff; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 414 | |
Miklos Szeredi | af109bc | 2012-08-15 13:01:24 +0200 | [diff] [blame] | 415 | /* Userspace expects S_IFREG in create mode */ |
| 416 | BUG_ON((mode & S_IFMT) != S_IFREG); |
| 417 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 418 | forget = fuse_alloc_forget(); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 419 | err = -ENOMEM; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 420 | if (!forget) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 421 | goto out_err; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 422 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 423 | err = -ENOMEM; |
Tejun Heo | acf9943 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 424 | ff = fuse_file_alloc(fc); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 425 | if (!ff) |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 426 | goto out_put_forget_req; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 427 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 428 | if (!fc->dont_mask) |
| 429 | mode &= ~current_umask(); |
| 430 | |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 431 | flags &= ~O_NOCTTY; |
| 432 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 433 | memset(&outentry, 0, sizeof(outentry)); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 434 | inarg.flags = flags; |
| 435 | inarg.mode = mode; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 436 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 437 | args.in.h.opcode = FUSE_CREATE; |
| 438 | args.in.h.nodeid = get_node_id(dir); |
| 439 | args.in.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 440 | args.in.args[0].size = sizeof(inarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 441 | args.in.args[0].value = &inarg; |
| 442 | args.in.args[1].size = entry->d_name.len + 1; |
| 443 | args.in.args[1].value = entry->d_name.name; |
| 444 | args.out.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 445 | args.out.args[0].size = sizeof(outentry); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 446 | args.out.args[0].value = &outentry; |
| 447 | args.out.args[1].size = sizeof(outopen); |
| 448 | args.out.args[1].value = &outopen; |
| 449 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 450 | if (err) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 451 | goto out_free_ff; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 452 | |
| 453 | err = -EIO; |
Miklos Szeredi | 2827d0b2 | 2005-11-28 13:44:16 -0800 | [diff] [blame] | 454 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 455 | goto out_free_ff; |
| 456 | |
Miklos Szeredi | c7b7143 | 2009-04-28 16:56:37 +0200 | [diff] [blame] | 457 | ff->fh = outopen.fh; |
| 458 | ff->nodeid = outentry.nodeid; |
| 459 | ff->open_flags = outopen.open_flags; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 460 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 461 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 462 | if (!inode) { |
| 463 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 464 | fuse_sync_release(ff, flags); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 465 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 466 | err = -ENOMEM; |
| 467 | goto out_err; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 468 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 469 | kfree(forget); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 470 | d_instantiate(entry, inode); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 471 | fuse_change_entry_timeout(entry, &outentry); |
Miklos Szeredi | 0952b2a | 2008-02-06 01:38:38 -0800 | [diff] [blame] | 472 | fuse_invalidate_attr(dir); |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 473 | err = finish_open(file, entry, generic_file_open, opened); |
| 474 | if (err) { |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 475 | fuse_sync_release(ff, flags); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 476 | } else { |
| 477 | file->private_data = fuse_file_get(ff); |
| 478 | fuse_finish_open(inode, file); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 479 | } |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 480 | return err; |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 481 | |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 482 | out_free_ff: |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 483 | fuse_file_free(ff); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 484 | out_put_forget_req: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 485 | kfree(forget); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 486 | out_err: |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 487 | return err; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 491 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 492 | struct file *file, unsigned flags, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 493 | umode_t mode, int *opened) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 494 | { |
| 495 | int err; |
| 496 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 497 | struct dentry *res = NULL; |
| 498 | |
Al Viro | 00699ad | 2016-07-05 09:44:53 -0400 | [diff] [blame] | 499 | if (d_in_lookup(entry)) { |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 500 | res = fuse_lookup(dir, entry, 0); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 501 | if (IS_ERR(res)) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 502 | return PTR_ERR(res); |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 503 | |
| 504 | if (res) |
| 505 | entry = res; |
| 506 | } |
| 507 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 508 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 509 | goto no_open; |
| 510 | |
| 511 | /* Only creates */ |
Al Viro | 4723768 | 2012-06-10 05:01:45 -0400 | [diff] [blame] | 512 | *opened |= FILE_CREATED; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 513 | |
| 514 | if (fc->no_create) |
| 515 | goto mknod; |
| 516 | |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 517 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 518 | if (err == -ENOSYS) { |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 519 | fc->no_create = 1; |
| 520 | goto mknod; |
| 521 | } |
| 522 | out_dput: |
| 523 | dput(res); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 524 | return err; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 525 | |
| 526 | mknod: |
| 527 | err = fuse_mknod(dir, entry, mode, 0); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 528 | if (err) |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 529 | goto out_dput; |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 530 | no_open: |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 531 | return finish_no_open(file, res); |
Miklos Szeredi | fd72faa | 2005-11-07 00:59:51 -0800 | [diff] [blame] | 532 | } |
| 533 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 534 | /* |
| 535 | * Code shared between mknod, mkdir, symlink and link |
| 536 | */ |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 537 | 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] | 538 | struct inode *dir, struct dentry *entry, |
Al Viro | 541af6a | 2011-07-26 03:17:33 -0400 | [diff] [blame] | 539 | umode_t mode) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 540 | { |
| 541 | struct fuse_entry_out outarg; |
| 542 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 543 | int err; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 544 | struct fuse_forget_link *forget; |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 545 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 546 | forget = fuse_alloc_forget(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 547 | if (!forget) |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 548 | return -ENOMEM; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 549 | |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 550 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 551 | args->in.h.nodeid = get_node_id(dir); |
| 552 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 553 | args->out.args[0].size = sizeof(outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 554 | args->out.args[0].value = &outarg; |
| 555 | err = fuse_simple_request(fc, args); |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 556 | if (err) |
| 557 | goto out_put_forget_req; |
| 558 | |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 559 | err = -EIO; |
| 560 | if (invalid_nodeid(outarg.nodeid)) |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 561 | goto out_put_forget_req; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 562 | |
| 563 | if ((outarg.attr.mode ^ mode) & S_IFMT) |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 564 | goto out_put_forget_req; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 565 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 566 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 567 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 568 | if (!inode) { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 569 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 570 | return -ENOMEM; |
| 571 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 572 | kfree(forget); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 573 | |
Miklos Szeredi | b70a80e | 2013-10-01 16:44:54 +0200 | [diff] [blame] | 574 | err = d_instantiate_no_diralias(entry, inode); |
| 575 | if (err) |
| 576 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 577 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 578 | fuse_change_entry_timeout(entry, &outarg); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 579 | fuse_invalidate_attr(dir); |
| 580 | return 0; |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 581 | |
Miklos Szeredi | 2d51013 | 2006-11-25 11:09:20 -0800 | [diff] [blame] | 582 | out_put_forget_req: |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 583 | kfree(forget); |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 584 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 587 | 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] | 588 | dev_t rdev) |
| 589 | { |
| 590 | struct fuse_mknod_in inarg; |
| 591 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 592 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 593 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 594 | if (!fc->dont_mask) |
| 595 | mode &= ~current_umask(); |
| 596 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 597 | memset(&inarg, 0, sizeof(inarg)); |
| 598 | inarg.mode = mode; |
| 599 | inarg.rdev = new_encode_dev(rdev); |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 600 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 601 | args.in.h.opcode = FUSE_MKNOD; |
| 602 | args.in.numargs = 2; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 603 | args.in.args[0].size = sizeof(inarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 604 | args.in.args[0].value = &inarg; |
| 605 | args.in.args[1].size = entry->d_name.len + 1; |
| 606 | args.in.args[1].value = entry->d_name.name; |
| 607 | return create_new_entry(fc, &args, dir, entry, mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 610 | 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] | 611 | bool excl) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 612 | { |
| 613 | return fuse_mknod(dir, entry, mode, 0); |
| 614 | } |
| 615 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 616 | 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] | 617 | { |
| 618 | struct fuse_mkdir_in inarg; |
| 619 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 620 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 621 | |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 622 | if (!fc->dont_mask) |
| 623 | mode &= ~current_umask(); |
| 624 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 625 | memset(&inarg, 0, sizeof(inarg)); |
| 626 | inarg.mode = mode; |
Miklos Szeredi | e0a43dd | 2009-06-30 20:12:23 +0200 | [diff] [blame] | 627 | inarg.umask = current_umask(); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 628 | args.in.h.opcode = FUSE_MKDIR; |
| 629 | args.in.numargs = 2; |
| 630 | args.in.args[0].size = sizeof(inarg); |
| 631 | args.in.args[0].value = &inarg; |
| 632 | args.in.args[1].size = entry->d_name.len + 1; |
| 633 | args.in.args[1].value = entry->d_name.name; |
| 634 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | static int fuse_symlink(struct inode *dir, struct dentry *entry, |
| 638 | const char *link) |
| 639 | { |
| 640 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 641 | unsigned len = strlen(link) + 1; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 642 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 643 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 644 | args.in.h.opcode = FUSE_SYMLINK; |
| 645 | args.in.numargs = 2; |
| 646 | args.in.args[0].size = entry->d_name.len + 1; |
| 647 | args.in.args[0].value = entry->d_name.name; |
| 648 | args.in.args[1].size = len; |
| 649 | args.in.args[1].value = link; |
| 650 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 651 | } |
| 652 | |
Seth Forshee | 703c736 | 2016-08-29 08:46:36 -0500 | [diff] [blame] | 653 | void fuse_update_ctime(struct inode *inode) |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 654 | { |
| 655 | if (!IS_NOCMTIME(inode)) { |
Deepa Dinamani | c2050a4 | 2016-09-14 07:48:06 -0700 | [diff] [blame] | 656 | inode->i_ctime = current_time(inode); |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 657 | mark_inode_dirty_sync(inode); |
| 658 | } |
| 659 | } |
| 660 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 661 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
| 662 | { |
| 663 | int err; |
| 664 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 665 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 666 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 667 | args.in.h.opcode = FUSE_UNLINK; |
| 668 | args.in.h.nodeid = get_node_id(dir); |
| 669 | args.in.numargs = 1; |
| 670 | args.in.args[0].size = entry->d_name.len + 1; |
| 671 | args.in.args[0].value = entry->d_name.name; |
| 672 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 673 | if (!err) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 674 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 675 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 676 | |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 677 | spin_lock(&fc->lock); |
| 678 | fi->attr_version = ++fc->attr_version; |
Miklos Szeredi | dfca7ce | 2013-02-04 15:57:42 +0100 | [diff] [blame] | 679 | /* |
| 680 | * If i_nlink == 0 then unlink doesn't make sense, yet this can |
| 681 | * happen if userspace filesystem is careless. It would be |
| 682 | * difficult to enforce correct nlink usage so just ignore this |
| 683 | * condition here |
| 684 | */ |
| 685 | if (inode->i_nlink > 0) |
| 686 | drop_nlink(inode); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 687 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 688 | fuse_invalidate_attr(inode); |
| 689 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 690 | fuse_invalidate_entry_cache(entry); |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 691 | fuse_update_ctime(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 692 | } else if (err == -EINTR) |
| 693 | fuse_invalidate_entry(entry); |
| 694 | return err; |
| 695 | } |
| 696 | |
| 697 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) |
| 698 | { |
| 699 | int err; |
| 700 | struct fuse_conn *fc = get_fuse_conn(dir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 701 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 702 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 703 | args.in.h.opcode = FUSE_RMDIR; |
| 704 | args.in.h.nodeid = get_node_id(dir); |
| 705 | args.in.numargs = 1; |
| 706 | args.in.args[0].size = entry->d_name.len + 1; |
| 707 | args.in.args[0].value = entry->d_name.name; |
| 708 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 709 | if (!err) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 710 | clear_nlink(d_inode(entry)); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 711 | fuse_invalidate_attr(dir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 712 | fuse_invalidate_entry_cache(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 713 | } else if (err == -EINTR) |
| 714 | fuse_invalidate_entry(entry); |
| 715 | return err; |
| 716 | } |
| 717 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 718 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
| 719 | struct inode *newdir, struct dentry *newent, |
| 720 | unsigned int flags, int opcode, size_t argsize) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 721 | { |
| 722 | int err; |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 723 | struct fuse_rename2_in inarg; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 724 | struct fuse_conn *fc = get_fuse_conn(olddir); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 725 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 726 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 727 | memset(&inarg, 0, argsize); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 728 | inarg.newdir = get_node_id(newdir); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 729 | inarg.flags = flags; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 730 | args.in.h.opcode = opcode; |
| 731 | args.in.h.nodeid = get_node_id(olddir); |
| 732 | args.in.numargs = 3; |
| 733 | args.in.args[0].size = argsize; |
| 734 | args.in.args[0].value = &inarg; |
| 735 | args.in.args[1].size = oldent->d_name.len + 1; |
| 736 | args.in.args[1].value = oldent->d_name.name; |
| 737 | args.in.args[2].size = newent->d_name.len + 1; |
| 738 | args.in.args[2].value = newent->d_name.name; |
| 739 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 740 | if (!err) { |
Miklos Szeredi | 08b6330 | 2007-11-28 16:22:03 -0800 | [diff] [blame] | 741 | /* ctime changes */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 742 | fuse_invalidate_attr(d_inode(oldent)); |
| 743 | fuse_update_ctime(d_inode(oldent)); |
Miklos Szeredi | 08b6330 | 2007-11-28 16:22:03 -0800 | [diff] [blame] | 744 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 745 | if (flags & RENAME_EXCHANGE) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 746 | fuse_invalidate_attr(d_inode(newent)); |
| 747 | fuse_update_ctime(d_inode(newent)); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 748 | } |
| 749 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 750 | fuse_invalidate_attr(olddir); |
| 751 | if (olddir != newdir) |
| 752 | fuse_invalidate_attr(newdir); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 753 | |
| 754 | /* newent will end up negative */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 755 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
| 756 | fuse_invalidate_attr(d_inode(newent)); |
Miklos Szeredi | 8cbdf1e | 2006-01-06 00:19:38 -0800 | [diff] [blame] | 757 | fuse_invalidate_entry_cache(newent); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 758 | fuse_update_ctime(d_inode(newent)); |
Miklos Szeredi | 5219f34 | 2009-11-04 10:24:52 +0100 | [diff] [blame] | 759 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 760 | } else if (err == -EINTR) { |
| 761 | /* If request was interrupted, DEITY only knows if the |
| 762 | rename actually took place. If the invalidation |
| 763 | fails (e.g. some process has CWD under the renamed |
| 764 | directory), then there can be inconsistency between |
| 765 | the dcache and the real filesystem. Tough luck. */ |
| 766 | fuse_invalidate_entry(oldent); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 767 | if (d_really_is_positive(newent)) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 768 | fuse_invalidate_entry(newent); |
| 769 | } |
| 770 | |
| 771 | return err; |
| 772 | } |
| 773 | |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 774 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
| 775 | struct inode *newdir, struct dentry *newent, |
| 776 | unsigned int flags) |
| 777 | { |
| 778 | struct fuse_conn *fc = get_fuse_conn(olddir); |
| 779 | int err; |
| 780 | |
| 781 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
| 782 | return -EINVAL; |
| 783 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 784 | if (flags) { |
| 785 | if (fc->no_rename2 || fc->minor < 23) |
| 786 | return -EINVAL; |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 787 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 788 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
| 789 | FUSE_RENAME2, |
| 790 | sizeof(struct fuse_rename2_in)); |
| 791 | if (err == -ENOSYS) { |
| 792 | fc->no_rename2 = 1; |
| 793 | err = -EINVAL; |
| 794 | } |
| 795 | } else { |
| 796 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, |
| 797 | FUSE_RENAME, |
| 798 | sizeof(struct fuse_rename_in)); |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 799 | } |
Miklos Szeredi | 1560c97 | 2014-04-28 16:43:44 +0200 | [diff] [blame] | 800 | |
Miklos Szeredi | 4237ba4 | 2014-07-10 10:50:19 +0200 | [diff] [blame] | 801 | return err; |
| 802 | } |
| 803 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 804 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
| 805 | struct dentry *newent) |
| 806 | { |
| 807 | int err; |
| 808 | struct fuse_link_in inarg; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 809 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 810 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 811 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 812 | |
| 813 | memset(&inarg, 0, sizeof(inarg)); |
| 814 | inarg.oldnodeid = get_node_id(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 815 | args.in.h.opcode = FUSE_LINK; |
| 816 | args.in.numargs = 2; |
| 817 | args.in.args[0].size = sizeof(inarg); |
| 818 | args.in.args[0].value = &inarg; |
| 819 | args.in.args[1].size = newent->d_name.len + 1; |
| 820 | args.in.args[1].value = newent->d_name.name; |
| 821 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 822 | /* Contrary to "normal" filesystems it can happen that link |
| 823 | makes two "logical" inodes point to the same "physical" |
| 824 | inode. We invalidate the attributes of the old one, so it |
| 825 | will reflect changes in the backing inode (link count, |
| 826 | etc.) |
| 827 | */ |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 828 | if (!err) { |
| 829 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 830 | |
| 831 | spin_lock(&fc->lock); |
| 832 | fi->attr_version = ++fc->attr_version; |
| 833 | inc_nlink(inode); |
| 834 | spin_unlock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 835 | fuse_invalidate_attr(inode); |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 836 | fuse_update_ctime(inode); |
Miklos Szeredi | ac45d61 | 2012-03-05 15:48:11 +0100 | [diff] [blame] | 837 | } else if (err == -EINTR) { |
| 838 | fuse_invalidate_attr(inode); |
| 839 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 840 | return err; |
| 841 | } |
| 842 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 843 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
| 844 | struct kstat *stat) |
| 845 | { |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 846 | unsigned int blkbits; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 847 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 848 | |
| 849 | /* see the comment in fuse_change_attributes() */ |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 850 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 851 | attr->size = i_size_read(inode); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 852 | attr->mtime = inode->i_mtime.tv_sec; |
| 853 | attr->mtimensec = inode->i_mtime.tv_nsec; |
Maxim Patlasov | 31f3267 | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 854 | attr->ctime = inode->i_ctime.tv_sec; |
| 855 | attr->ctimensec = inode->i_ctime.tv_nsec; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 856 | } |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 857 | |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 858 | stat->dev = inode->i_sb->s_dev; |
| 859 | stat->ino = attr->ino; |
| 860 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); |
| 861 | stat->nlink = attr->nlink; |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 862 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
| 863 | stat->gid = make_kgid(&init_user_ns, attr->gid); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 864 | stat->rdev = inode->i_rdev; |
| 865 | stat->atime.tv_sec = attr->atime; |
| 866 | stat->atime.tv_nsec = attr->atimensec; |
| 867 | stat->mtime.tv_sec = attr->mtime; |
| 868 | stat->mtime.tv_nsec = attr->mtimensec; |
| 869 | stat->ctime.tv_sec = attr->ctime; |
| 870 | stat->ctime.tv_nsec = attr->ctimensec; |
| 871 | stat->size = attr->size; |
| 872 | stat->blocks = attr->blocks; |
Miklos Szeredi | 203627b | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 873 | |
| 874 | if (attr->blksize != 0) |
| 875 | blkbits = ilog2(attr->blksize); |
| 876 | else |
| 877 | blkbits = inode->i_sb->s_blocksize_bits; |
| 878 | |
| 879 | stat->blksize = 1 << blkbits; |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 880 | } |
| 881 | |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 882 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
| 883 | struct file *file) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 884 | { |
| 885 | int err; |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 886 | struct fuse_getattr_in inarg; |
| 887 | struct fuse_attr_out outarg; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 888 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 889 | FUSE_ARGS(args); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 890 | u64 attr_version; |
| 891 | |
Miklos Szeredi | 7dca9fd | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 892 | attr_version = fuse_get_attr_version(fc); |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 893 | |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 894 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 895 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 896 | /* Directories have separate file-handle space */ |
| 897 | if (file && S_ISREG(inode->i_mode)) { |
| 898 | struct fuse_file *ff = file->private_data; |
| 899 | |
| 900 | inarg.getattr_flags |= FUSE_GETATTR_FH; |
| 901 | inarg.fh = ff->fh; |
| 902 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 903 | args.in.h.opcode = FUSE_GETATTR; |
| 904 | args.in.h.nodeid = get_node_id(inode); |
| 905 | args.in.numargs = 1; |
| 906 | args.in.args[0].size = sizeof(inarg); |
| 907 | args.in.args[0].value = &inarg; |
| 908 | args.out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 909 | args.out.args[0].size = sizeof(outarg); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 910 | args.out.args[0].value = &outarg; |
| 911 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 912 | if (!err) { |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 913 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 914 | make_bad_inode(inode); |
| 915 | err = -EIO; |
| 916 | } else { |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 917 | fuse_change_attributes(inode, &outarg.attr, |
| 918 | attr_timeout(&outarg), |
Miklos Szeredi | 1fb69e7 | 2007-10-18 03:06:58 -0700 | [diff] [blame] | 919 | attr_version); |
| 920 | if (stat) |
Miklos Szeredi | c79e322 | 2007-10-18 03:06:59 -0700 | [diff] [blame] | 921 | fuse_fillattr(inode, &outarg.attr, stat); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 922 | } |
| 923 | } |
| 924 | return err; |
| 925 | } |
| 926 | |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 927 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
| 928 | struct file *file, bool *refreshed) |
| 929 | { |
| 930 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 931 | int err; |
| 932 | bool r; |
| 933 | |
Miklos Szeredi | 126b9d4 | 2014-07-07 15:28:50 +0200 | [diff] [blame] | 934 | if (time_before64(fi->i_time, get_jiffies_64())) { |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 935 | r = true; |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 936 | forget_all_cached_acls(inode); |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 937 | err = fuse_do_getattr(inode, stat, file); |
| 938 | } else { |
| 939 | r = false; |
| 940 | err = 0; |
| 941 | if (stat) { |
| 942 | generic_fillattr(inode, stat); |
| 943 | stat->mode = fi->orig_i_mode; |
Pavel Shilovsky | 45c72cd | 2012-05-10 19:49:38 +0400 | [diff] [blame] | 944 | stat->ino = fi->orig_ino; |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 945 | } |
| 946 | } |
| 947 | |
| 948 | if (refreshed != NULL) |
| 949 | *refreshed = r; |
| 950 | |
| 951 | return err; |
| 952 | } |
| 953 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 954 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 955 | u64 child_nodeid, struct qstr *name) |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 956 | { |
| 957 | int err = -ENOTDIR; |
| 958 | struct inode *parent; |
| 959 | struct dentry *dir; |
| 960 | struct dentry *entry; |
| 961 | |
| 962 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); |
| 963 | if (!parent) |
| 964 | return -ENOENT; |
| 965 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 966 | inode_lock(parent); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 967 | if (!S_ISDIR(parent->i_mode)) |
| 968 | goto unlock; |
| 969 | |
| 970 | err = -ENOENT; |
| 971 | dir = d_find_alias(parent); |
| 972 | if (!dir) |
| 973 | goto unlock; |
| 974 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 975 | name->hash = full_name_hash(dir, name->name, name->len); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 976 | entry = d_lookup(dir, name); |
| 977 | dput(dir); |
| 978 | if (!entry) |
| 979 | goto unlock; |
| 980 | |
| 981 | fuse_invalidate_attr(parent); |
| 982 | fuse_invalidate_entry(entry); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 983 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 984 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 985 | inode_lock(d_inode(entry)); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 986 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 987 | err = -ENOENT; |
| 988 | goto badentry; |
| 989 | } |
| 990 | if (d_mountpoint(entry)) { |
| 991 | err = -EBUSY; |
| 992 | goto badentry; |
| 993 | } |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 994 | if (d_is_dir(entry)) { |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 995 | shrink_dcache_parent(entry); |
| 996 | if (!simple_empty(entry)) { |
| 997 | err = -ENOTEMPTY; |
| 998 | goto badentry; |
| 999 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1000 | d_inode(entry)->i_flags |= S_DEAD; |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 1001 | } |
| 1002 | dont_mount(entry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1003 | clear_nlink(d_inode(entry)); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 1004 | err = 0; |
| 1005 | badentry: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1006 | inode_unlock(d_inode(entry)); |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 1007 | if (!err) |
| 1008 | d_delete(entry); |
| 1009 | } else { |
| 1010 | err = 0; |
| 1011 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1012 | dput(entry); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1013 | |
| 1014 | unlock: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1015 | inode_unlock(parent); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1016 | iput(parent); |
| 1017 | return err; |
| 1018 | } |
| 1019 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1020 | /* |
| 1021 | * Calling into a user-controlled filesystem gives the filesystem |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1022 | * daemon ptrace-like capabilities over the current process. This |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1023 | * means, that the filesystem daemon is able to record the exact |
| 1024 | * filesystem operations performed, and can also control the behavior |
| 1025 | * of the requester process in otherwise impossible ways. For example |
| 1026 | * it can delay the operation for arbitrary length of time allowing |
| 1027 | * DoS against the requester. |
| 1028 | * |
| 1029 | * For this reason only those processes can call into the filesystem, |
| 1030 | * for which the owner of the mount has ptrace privilege. This |
| 1031 | * excludes processes started by other users, suid or sgid processes. |
| 1032 | */ |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1033 | int fuse_allow_current_process(struct fuse_conn *fc) |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1034 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1035 | const struct cred *cred; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1036 | |
Miklos Szeredi | 29433a2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1037 | if (fc->allow_other) |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1038 | return 1; |
| 1039 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1040 | cred = current_cred(); |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1041 | if (uid_eq(cred->euid, fc->user_id) && |
| 1042 | uid_eq(cred->suid, fc->user_id) && |
| 1043 | uid_eq(cred->uid, fc->user_id) && |
| 1044 | gid_eq(cred->egid, fc->group_id) && |
| 1045 | gid_eq(cred->sgid, fc->group_id) && |
| 1046 | gid_eq(cred->gid, fc->group_id)) |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1047 | return 1; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1048 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1049 | return 0; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 1050 | } |
| 1051 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1052 | static int fuse_access(struct inode *inode, int mask) |
| 1053 | { |
| 1054 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1055 | FUSE_ARGS(args); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1056 | struct fuse_access_in inarg; |
| 1057 | int err; |
| 1058 | |
Miklos Szeredi | 698fa1d | 2013-10-01 16:41:23 +0200 | [diff] [blame] | 1059 | BUG_ON(mask & MAY_NOT_BLOCK); |
| 1060 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1061 | if (fc->no_access) |
| 1062 | return 0; |
| 1063 | |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1064 | memset(&inarg, 0, sizeof(inarg)); |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 1065 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1066 | args.in.h.opcode = FUSE_ACCESS; |
| 1067 | args.in.h.nodeid = get_node_id(inode); |
| 1068 | args.in.numargs = 1; |
| 1069 | args.in.args[0].size = sizeof(inarg); |
| 1070 | args.in.args[0].value = &inarg; |
| 1071 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | 31d40d7 | 2005-11-07 00:59:50 -0800 | [diff] [blame] | 1072 | if (err == -ENOSYS) { |
| 1073 | fc->no_access = 1; |
| 1074 | err = 0; |
| 1075 | } |
| 1076 | return err; |
| 1077 | } |
| 1078 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1079 | static int fuse_perm_getattr(struct inode *inode, int mask) |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1080 | { |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1081 | if (mask & MAY_NOT_BLOCK) |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1082 | return -ECHILD; |
| 1083 | |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 1084 | forget_all_cached_acls(inode); |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1085 | return fuse_do_getattr(inode, NULL, NULL); |
| 1086 | } |
| 1087 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1088 | /* |
| 1089 | * Check permission. The two basic access models of FUSE are: |
| 1090 | * |
| 1091 | * 1) Local access checking ('default_permissions' mount option) based |
| 1092 | * on file mode. This is the plain old disk filesystem permission |
| 1093 | * modell. |
| 1094 | * |
| 1095 | * 2) "Remote" access checking, where server is responsible for |
| 1096 | * checking permission in each inode operation. An exception to this |
| 1097 | * is if ->permission() was invoked from sys_access() in which case an |
| 1098 | * access request is sent. Execute permission is still checked |
| 1099 | * locally based on file mode. |
| 1100 | */ |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1101 | static int fuse_permission(struct inode *inode, int mask) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1102 | { |
| 1103 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1104 | bool refreshed = false; |
| 1105 | int err = 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1106 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1107 | if (!fuse_allow_current_process(fc)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1108 | return -EACCES; |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1109 | |
| 1110 | /* |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1111 | * If attributes are needed, refresh them before proceeding |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1112 | */ |
Miklos Szeredi | 29433a2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1113 | if (fc->default_permissions || |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1114 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1115 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1116 | |
Miklos Szeredi | 126b9d4 | 2014-07-07 15:28:50 +0200 | [diff] [blame] | 1117 | if (time_before64(fi->i_time, get_jiffies_64())) { |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1118 | refreshed = true; |
| 1119 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1120 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | 19690dd | 2011-03-21 13:58:06 +0100 | [diff] [blame] | 1121 | if (err) |
| 1122 | return err; |
| 1123 | } |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1124 | } |
| 1125 | |
Miklos Szeredi | 29433a2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1126 | if (fc->default_permissions) { |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 1127 | err = generic_permission(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1128 | |
| 1129 | /* If permission is denied, try to refresh file |
| 1130 | attributes. This is also needed, because the root |
| 1131 | node will at first have no permissions */ |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1132 | if (err == -EACCES && !refreshed) { |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1133 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1134 | if (!err) |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 1135 | err = generic_permission(inode, mask); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1136 | } |
| 1137 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1138 | /* Note: the opposite of the above test does not |
| 1139 | exist. So if permissions are revoked this won't be |
| 1140 | noticed immediately, only after the attribute |
| 1141 | timeout has expired */ |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 1142 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1143 | err = fuse_access(inode, mask); |
| 1144 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { |
| 1145 | if (!(inode->i_mode & S_IXUGO)) { |
| 1146 | if (refreshed) |
| 1147 | return -EACCES; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1148 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1149 | err = fuse_perm_getattr(inode, mask); |
Miklos Szeredi | e8e9615 | 2007-10-16 23:31:06 -0700 | [diff] [blame] | 1150 | if (!err && !(inode->i_mode & S_IXUGO)) |
| 1151 | return -EACCES; |
| 1152 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1153 | } |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1154 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1158 | struct dir_context *ctx) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1159 | { |
| 1160 | while (nbytes >= FUSE_NAME_OFFSET) { |
| 1161 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; |
| 1162 | size_t reclen = FUSE_DIRENT_SIZE(dirent); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1163 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 1164 | return -EIO; |
| 1165 | if (reclen > nbytes) |
| 1166 | break; |
Miklos Szeredi | efeb9e6 | 2013-09-03 14:28:38 +0200 | [diff] [blame] | 1167 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
| 1168 | return -EIO; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1169 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1170 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
| 1171 | dirent->ino, dirent->type)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1172 | break; |
| 1173 | |
| 1174 | buf += reclen; |
| 1175 | nbytes -= reclen; |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1176 | ctx->pos = dirent->off; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1177 | } |
| 1178 | |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1182 | static int fuse_direntplus_link(struct file *file, |
| 1183 | struct fuse_direntplus *direntplus, |
| 1184 | u64 attr_version) |
| 1185 | { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1186 | struct fuse_entry_out *o = &direntplus->entry_out; |
| 1187 | struct fuse_dirent *dirent = &direntplus->dirent; |
| 1188 | struct dentry *parent = file->f_path.dentry; |
| 1189 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); |
| 1190 | struct dentry *dentry; |
| 1191 | struct dentry *alias; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1192 | struct inode *dir = d_inode(parent); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1193 | struct fuse_conn *fc; |
| 1194 | struct inode *inode; |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1195 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1196 | |
| 1197 | if (!o->nodeid) { |
| 1198 | /* |
| 1199 | * Unlike in the case of fuse_lookup, zero nodeid does not mean |
| 1200 | * ENOENT. Instead, it only means the userspace filesystem did |
| 1201 | * not want to return attributes/handle for this entry. |
| 1202 | * |
| 1203 | * So do nothing. |
| 1204 | */ |
| 1205 | return 0; |
| 1206 | } |
| 1207 | |
| 1208 | if (name.name[0] == '.') { |
| 1209 | /* |
| 1210 | * We could potentially refresh the attributes of the directory |
| 1211 | * and its parent? |
| 1212 | */ |
| 1213 | if (name.len == 1) |
| 1214 | return 0; |
| 1215 | if (name.name[1] == '.' && name.len == 2) |
| 1216 | return 0; |
| 1217 | } |
Miklos Szeredi | a28ef45 | 2013-07-17 14:53:53 +0200 | [diff] [blame] | 1218 | |
| 1219 | if (invalid_nodeid(o->nodeid)) |
| 1220 | return -EIO; |
| 1221 | if (!fuse_valid_type(o->attr.mode)) |
| 1222 | return -EIO; |
| 1223 | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1224 | fc = get_fuse_conn(dir); |
| 1225 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 1226 | name.hash = full_name_hash(parent, name.name, name.len); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1227 | dentry = d_lookup(parent, &name); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1228 | if (!dentry) { |
| 1229 | retry: |
| 1230 | dentry = d_alloc_parallel(parent, &name, &wq); |
| 1231 | if (IS_ERR(dentry)) |
| 1232 | return PTR_ERR(dentry); |
| 1233 | } |
| 1234 | if (!d_in_lookup(dentry)) { |
| 1235 | struct fuse_inode *fi; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1236 | inode = d_inode(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1237 | if (!inode || |
| 1238 | get_node_id(inode) != o->nodeid || |
| 1239 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { |
Eric W. Biederman | 5542aa2 | 2014-02-13 09:46:25 -0800 | [diff] [blame] | 1240 | d_invalidate(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1241 | dput(dentry); |
| 1242 | goto retry; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1243 | } |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1244 | if (is_bad_inode(inode)) { |
| 1245 | dput(dentry); |
| 1246 | return -EIO; |
| 1247 | } |
| 1248 | |
| 1249 | fi = get_fuse_inode(inode); |
| 1250 | spin_lock(&fc->lock); |
| 1251 | fi->nlookup++; |
| 1252 | spin_unlock(&fc->lock); |
| 1253 | |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 1254 | forget_all_cached_acls(inode); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1255 | fuse_change_attributes(inode, &o->attr, |
| 1256 | entry_attr_timeout(o), |
| 1257 | attr_version); |
| 1258 | /* |
| 1259 | * The other branch comes via fuse_iget() |
| 1260 | * which bumps nlookup inside |
| 1261 | */ |
| 1262 | } else { |
| 1263 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, |
| 1264 | &o->attr, entry_attr_timeout(o), |
| 1265 | attr_version); |
| 1266 | if (!inode) |
| 1267 | inode = ERR_PTR(-ENOMEM); |
| 1268 | |
| 1269 | alias = d_splice_alias(inode, dentry); |
| 1270 | d_lookup_done(dentry); |
| 1271 | if (alias) { |
| 1272 | dput(dentry); |
| 1273 | dentry = alias; |
| 1274 | } |
| 1275 | if (IS_ERR(dentry)) |
| 1276 | return PTR_ERR(dentry); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1277 | } |
Miklos Szeredi | 6314efe | 2013-10-01 16:41:22 +0200 | [diff] [blame] | 1278 | if (fc->readdirplus_auto) |
| 1279 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1280 | fuse_change_entry_timeout(dentry, o); |
| 1281 | |
Miklos Szeredi | c7263bc | 2013-07-17 14:53:54 +0200 | [diff] [blame] | 1282 | dput(dentry); |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1283 | return 0; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1284 | } |
| 1285 | |
| 1286 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1287 | struct dir_context *ctx, u64 attr_version) |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1288 | { |
| 1289 | struct fuse_direntplus *direntplus; |
| 1290 | struct fuse_dirent *dirent; |
| 1291 | size_t reclen; |
| 1292 | int over = 0; |
| 1293 | int ret; |
| 1294 | |
| 1295 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { |
| 1296 | direntplus = (struct fuse_direntplus *) buf; |
| 1297 | dirent = &direntplus->dirent; |
| 1298 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); |
| 1299 | |
| 1300 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 1301 | return -EIO; |
| 1302 | if (reclen > nbytes) |
| 1303 | break; |
Miklos Szeredi | efeb9e6 | 2013-09-03 14:28:38 +0200 | [diff] [blame] | 1304 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
| 1305 | return -EIO; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1306 | |
| 1307 | if (!over) { |
| 1308 | /* We fill entries into dstbuf only as much as |
| 1309 | it can hold. But we still continue iterating |
| 1310 | over remaining entries to link them. If not, |
| 1311 | we need to send a FORGET for each of those |
| 1312 | which we did not link. |
| 1313 | */ |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1314 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
| 1315 | dirent->ino, dirent->type); |
Miklos Szeredi | 8783885 | 2017-10-25 16:34:27 +0200 | [diff] [blame] | 1316 | if (!over) |
| 1317 | ctx->pos = dirent->off; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1318 | } |
| 1319 | |
| 1320 | buf += reclen; |
| 1321 | nbytes -= reclen; |
| 1322 | |
| 1323 | ret = fuse_direntplus_link(file, direntplus, attr_version); |
| 1324 | if (ret) |
| 1325 | fuse_force_forget(file, direntplus->entry_out.nodeid); |
| 1326 | } |
| 1327 | |
| 1328 | return 0; |
| 1329 | } |
| 1330 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1331 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1332 | { |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1333 | int plus, err; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1334 | size_t nbytes; |
| 1335 | struct page *page; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1336 | struct inode *inode = file_inode(file); |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1337 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 248d86e | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1338 | struct fuse_req *req; |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1339 | u64 attr_version = 0; |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 1340 | bool locked; |
Miklos Szeredi | 248d86e | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1341 | |
| 1342 | if (is_bad_inode(inode)) |
| 1343 | return -EIO; |
| 1344 | |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 1345 | req = fuse_get_req(fc, 1); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 1346 | if (IS_ERR(req)) |
| 1347 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1348 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1349 | page = alloc_page(GFP_KERNEL); |
| 1350 | if (!page) { |
| 1351 | fuse_put_request(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1352 | return -ENOMEM; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1353 | } |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1354 | |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1355 | plus = fuse_use_readdirplus(inode, ctx); |
Miklos Szeredi | f4975c6 | 2009-04-02 14:25:34 +0200 | [diff] [blame] | 1356 | req->out.argpages = 1; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1357 | req->num_pages = 1; |
| 1358 | req->pages[0] = page; |
Maxim Patlasov | 85f40ae | 2012-10-26 19:49:33 +0400 | [diff] [blame] | 1359 | req->page_descs[0].length = PAGE_SIZE; |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1360 | if (plus) { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1361 | attr_version = fuse_get_attr_version(fc); |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1362 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1363 | FUSE_READDIRPLUS); |
| 1364 | } else { |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1365 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1366 | FUSE_READDIR); |
| 1367 | } |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 1368 | locked = fuse_lock_inode(inode); |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1369 | fuse_request_send(fc, req); |
Miklos Szeredi | 68fbfcb | 2018-07-26 16:13:11 +0200 | [diff] [blame] | 1370 | fuse_unlock_inode(inode, locked); |
Miklos Szeredi | 361b1eb5 | 2006-01-16 22:14:45 -0800 | [diff] [blame] | 1371 | nbytes = req->out.args[0].size; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1372 | err = req->out.h.error; |
| 1373 | fuse_put_request(fc, req); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1374 | if (!err) { |
Feng Shuo | 4582a4a | 2013-01-15 11:23:28 +0800 | [diff] [blame] | 1375 | if (plus) { |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1376 | err = parse_dirplusfile(page_address(page), nbytes, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1377 | file, ctx, |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1378 | attr_version); |
| 1379 | } else { |
| 1380 | err = parse_dirfile(page_address(page), nbytes, file, |
Al Viro | 8d3af7f | 2013-05-18 03:03:58 -0400 | [diff] [blame] | 1381 | ctx); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 1382 | } |
| 1383 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1384 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1385 | __free_page(page); |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 1386 | fuse_invalidate_atime(inode); |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 1387 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1388 | } |
| 1389 | |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1390 | static const char *fuse_get_link(struct dentry *dentry, |
Al Viro | fceef39 | 2015-12-29 15:58:39 -0500 | [diff] [blame] | 1391 | struct inode *inode, |
| 1392 | struct delayed_call *done) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1393 | { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1394 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1395 | FUSE_ARGS(args); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1396 | char *link; |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1397 | ssize_t ret; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1398 | |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1399 | if (!dentry) |
| 1400 | return ERR_PTR(-ECHILD); |
| 1401 | |
Al Viro | cd3417c | 2015-12-29 16:03:53 -0500 | [diff] [blame] | 1402 | link = kmalloc(PAGE_SIZE, GFP_KERNEL); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1403 | if (!link) |
| 1404 | return ERR_PTR(-ENOMEM); |
| 1405 | |
| 1406 | args.in.h.opcode = FUSE_READLINK; |
| 1407 | args.in.h.nodeid = get_node_id(inode); |
| 1408 | args.out.argvar = 1; |
| 1409 | args.out.numargs = 1; |
| 1410 | args.out.args[0].size = PAGE_SIZE - 1; |
| 1411 | args.out.args[0].value = link; |
| 1412 | ret = fuse_simple_request(fc, &args); |
| 1413 | if (ret < 0) { |
Al Viro | cd3417c | 2015-12-29 16:03:53 -0500 | [diff] [blame] | 1414 | kfree(link); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1415 | link = ERR_PTR(ret); |
| 1416 | } else { |
| 1417 | link[ret] = '\0'; |
Al Viro | fceef39 | 2015-12-29 15:58:39 -0500 | [diff] [blame] | 1418 | set_delayed_call(done, kfree_link, link); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1419 | } |
Andrew Gallagher | 451418f | 2013-11-05 03:55:43 -0800 | [diff] [blame] | 1420 | fuse_invalidate_atime(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1421 | return link; |
| 1422 | } |
| 1423 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1424 | static int fuse_dir_open(struct inode *inode, struct file *file) |
| 1425 | { |
Miklos Szeredi | 91fe96b | 2009-04-28 16:56:37 +0200 | [diff] [blame] | 1426 | return fuse_open_common(inode, file, true); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1427 | } |
| 1428 | |
| 1429 | static int fuse_dir_release(struct inode *inode, struct file *file) |
| 1430 | { |
Miklos Szeredi | 8b0797a | 2009-04-28 16:56:39 +0200 | [diff] [blame] | 1431 | fuse_release_common(file, FUSE_RELEASEDIR); |
| 1432 | |
| 1433 | return 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1436 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
| 1437 | int datasync) |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1438 | { |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1439 | return fuse_fsync_common(file, start, end, datasync, 1); |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1440 | } |
| 1441 | |
Miklos Szeredi | b18da0c | 2011-12-13 11:58:49 +0100 | [diff] [blame] | 1442 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
| 1443 | unsigned long arg) |
| 1444 | { |
| 1445 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); |
| 1446 | |
| 1447 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ |
| 1448 | if (fc->minor < 18) |
| 1449 | return -ENOTTY; |
| 1450 | |
| 1451 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); |
| 1452 | } |
| 1453 | |
| 1454 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, |
| 1455 | unsigned long arg) |
| 1456 | { |
| 1457 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); |
| 1458 | |
| 1459 | if (fc->minor < 18) |
| 1460 | return -ENOTTY; |
| 1461 | |
| 1462 | return fuse_ioctl_common(file, cmd, arg, |
| 1463 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); |
| 1464 | } |
| 1465 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1466 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1467 | { |
| 1468 | /* Always update if mtime is explicitly set */ |
| 1469 | if (ivalid & ATTR_MTIME_SET) |
| 1470 | return true; |
| 1471 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1472 | /* Or if kernel i_mtime is the official one */ |
| 1473 | if (trust_local_mtime) |
| 1474 | return true; |
| 1475 | |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1476 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
| 1477 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) |
| 1478 | return false; |
| 1479 | |
| 1480 | /* In all other cases update */ |
| 1481 | return true; |
| 1482 | } |
| 1483 | |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1484 | 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] | 1485 | bool trust_local_cmtime) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1486 | { |
| 1487 | unsigned ivalid = iattr->ia_valid; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1488 | |
| 1489 | if (ivalid & ATTR_MODE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1490 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1491 | if (ivalid & ATTR_UID) |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1492 | 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] | 1493 | if (ivalid & ATTR_GID) |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 1494 | 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] | 1495 | if (ivalid & ATTR_SIZE) |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1496 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1497 | if (ivalid & ATTR_ATIME) { |
| 1498 | arg->valid |= FATTR_ATIME; |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1499 | arg->atime = iattr->ia_atime.tv_sec; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1500 | arg->atimensec = iattr->ia_atime.tv_nsec; |
| 1501 | if (!(ivalid & ATTR_ATIME_SET)) |
| 1502 | arg->valid |= FATTR_ATIME_NOW; |
| 1503 | } |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1504 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1505 | arg->valid |= FATTR_MTIME; |
Miklos Szeredi | befc649 | 2005-11-07 00:59:52 -0800 | [diff] [blame] | 1506 | arg->mtime = iattr->ia_mtime.tv_sec; |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1507 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1508 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
Miklos Szeredi | 17637cb | 2007-10-18 03:07:01 -0700 | [diff] [blame] | 1509 | arg->valid |= FATTR_MTIME_NOW; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1510 | } |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1511 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
| 1512 | arg->valid |= FATTR_CTIME; |
| 1513 | arg->ctime = iattr->ia_ctime.tv_sec; |
| 1514 | arg->ctimensec = iattr->ia_ctime.tv_nsec; |
| 1515 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1516 | } |
| 1517 | |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1518 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1519 | * Prevent concurrent writepages on inode |
| 1520 | * |
| 1521 | * This is done by adding a negative bias to the inode write counter |
| 1522 | * and waiting for all pending writes to finish. |
| 1523 | */ |
| 1524 | void fuse_set_nowrite(struct inode *inode) |
| 1525 | { |
| 1526 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1527 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1528 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1529 | BUG_ON(!inode_is_locked(inode)); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1530 | |
| 1531 | spin_lock(&fc->lock); |
| 1532 | BUG_ON(fi->writectr < 0); |
| 1533 | fi->writectr += FUSE_NOWRITE; |
| 1534 | spin_unlock(&fc->lock); |
| 1535 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
| 1536 | } |
| 1537 | |
| 1538 | /* |
| 1539 | * Allow writepages on inode |
| 1540 | * |
| 1541 | * Remove the bias from the writecounter and send any queued |
| 1542 | * writepages. |
| 1543 | */ |
| 1544 | static void __fuse_release_nowrite(struct inode *inode) |
| 1545 | { |
| 1546 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 1547 | |
| 1548 | BUG_ON(fi->writectr != FUSE_NOWRITE); |
| 1549 | fi->writectr = 0; |
| 1550 | fuse_flush_writepages(inode); |
| 1551 | } |
| 1552 | |
| 1553 | void fuse_release_nowrite(struct inode *inode) |
| 1554 | { |
| 1555 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 1556 | |
| 1557 | spin_lock(&fc->lock); |
| 1558 | __fuse_release_nowrite(inode); |
| 1559 | spin_unlock(&fc->lock); |
| 1560 | } |
| 1561 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1562 | 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] | 1563 | struct inode *inode, |
| 1564 | struct fuse_setattr_in *inarg_p, |
| 1565 | struct fuse_attr_out *outarg_p) |
| 1566 | { |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1567 | args->in.h.opcode = FUSE_SETATTR; |
| 1568 | args->in.h.nodeid = get_node_id(inode); |
| 1569 | args->in.numargs = 1; |
| 1570 | args->in.args[0].size = sizeof(*inarg_p); |
| 1571 | args->in.args[0].value = inarg_p; |
| 1572 | args->out.numargs = 1; |
Miklos Szeredi | 21f6217 | 2015-01-06 10:45:35 +0100 | [diff] [blame] | 1573 | args->out.args[0].size = sizeof(*outarg_p); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1574 | args->out.args[0].value = outarg_p; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1575 | } |
| 1576 | |
| 1577 | /* |
| 1578 | * Flush inode->i_mtime to the server |
| 1579 | */ |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1580 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1581 | { |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1582 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1583 | FUSE_ARGS(args); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1584 | struct fuse_setattr_in inarg; |
| 1585 | struct fuse_attr_out outarg; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1586 | |
| 1587 | memset(&inarg, 0, sizeof(inarg)); |
| 1588 | memset(&outarg, 0, sizeof(outarg)); |
| 1589 | |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1590 | inarg.valid = FATTR_MTIME; |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1591 | inarg.mtime = inode->i_mtime.tv_sec; |
| 1592 | inarg.mtimensec = inode->i_mtime.tv_nsec; |
Maxim Patlasov | ab9e13f | 2014-04-28 14:19:24 +0200 | [diff] [blame] | 1593 | if (fc->minor >= 23) { |
| 1594 | inarg.valid |= FATTR_CTIME; |
| 1595 | inarg.ctime = inode->i_ctime.tv_sec; |
| 1596 | inarg.ctimensec = inode->i_ctime.tv_nsec; |
| 1597 | } |
Miklos Szeredi | 1e18bda | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 1598 | if (ff) { |
| 1599 | inarg.valid |= FATTR_FH; |
| 1600 | inarg.fh = ff->fh; |
| 1601 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1602 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1603 | |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1604 | return fuse_simple_request(fc, &args); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1605 | } |
| 1606 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1607 | /* |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1608 | * Set attributes, and at the same time refresh them. |
| 1609 | * |
| 1610 | * Truncation is slightly complicated, because the 'truncate' request |
| 1611 | * 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] | 1612 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
| 1613 | * and the actual truncation by hand. |
Miklos Szeredi | 6f9f118 | 2006-01-06 00:19:39 -0800 | [diff] [blame] | 1614 | */ |
Jan Kara | 6249033 | 2016-05-26 17:12:41 +0200 | [diff] [blame] | 1615 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
Maxim Patlasov | efb9fa9 | 2012-12-18 14:05:08 +0400 | [diff] [blame] | 1616 | struct file *file) |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1617 | { |
Jan Kara | 6249033 | 2016-05-26 17:12:41 +0200 | [diff] [blame] | 1618 | struct inode *inode = d_inode(dentry); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1619 | struct fuse_conn *fc = get_fuse_conn(inode); |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1620 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1621 | FUSE_ARGS(args); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1622 | struct fuse_setattr_in inarg; |
| 1623 | struct fuse_attr_out outarg; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1624 | bool is_truncate = false; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1625 | bool is_wb = fc->writeback_cache; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1626 | loff_t oldsize; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1627 | int err; |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1628 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1629 | |
Miklos Szeredi | 29433a2 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1630 | if (!fc->default_permissions) |
Christoph Hellwig | db78b87 | 2010-06-04 11:30:03 +0200 | [diff] [blame] | 1631 | attr->ia_valid |= ATTR_FORCE; |
| 1632 | |
Jan Kara | 31051c8 | 2016-05-26 16:55:18 +0200 | [diff] [blame] | 1633 | err = setattr_prepare(dentry, attr); |
Christoph Hellwig | db78b87 | 2010-06-04 11:30:03 +0200 | [diff] [blame] | 1634 | if (err) |
| 1635 | return err; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1636 | |
Miklos Szeredi | 8d56add | 2011-02-25 14:44:58 +0100 | [diff] [blame] | 1637 | if (attr->ia_valid & ATTR_OPEN) { |
Miklos Szeredi | ebdc37f | 2018-02-08 15:17:38 +0100 | [diff] [blame] | 1638 | /* This is coming from open(..., ... | O_TRUNC); */ |
| 1639 | WARN_ON(!(attr->ia_valid & ATTR_SIZE)); |
| 1640 | WARN_ON(attr->ia_size != 0); |
| 1641 | if (fc->atomic_o_trunc) { |
| 1642 | /* |
| 1643 | * No need to send request to userspace, since actual |
| 1644 | * truncation has already been done by OPEN. But still |
| 1645 | * need to truncate page cache. |
| 1646 | */ |
| 1647 | i_size_write(inode, 0); |
| 1648 | truncate_pagecache(inode, 0); |
Miklos Szeredi | 8d56add | 2011-02-25 14:44:58 +0100 | [diff] [blame] | 1649 | return 0; |
Miklos Szeredi | ebdc37f | 2018-02-08 15:17:38 +0100 | [diff] [blame] | 1650 | } |
Miklos Szeredi | 8d56add | 2011-02-25 14:44:58 +0100 | [diff] [blame] | 1651 | file = NULL; |
| 1652 | } |
Miklos Szeredi | 6ff958e | 2007-10-18 03:07:02 -0700 | [diff] [blame] | 1653 | |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 1654 | if (attr->ia_valid & ATTR_SIZE) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1655 | is_truncate = true; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1656 | |
Miklos Szeredi | c829f32 | 2019-10-23 14:26:37 +0200 | [diff] [blame] | 1657 | /* Flush dirty data/metadata before non-truncate SETATTR */ |
| 1658 | if (is_wb && S_ISREG(inode->i_mode) && |
| 1659 | attr->ia_valid & |
| 1660 | (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET | |
| 1661 | ATTR_TIMES_SET)) { |
| 1662 | err = write_inode_now(inode, true); |
| 1663 | if (err) |
| 1664 | return err; |
| 1665 | |
| 1666 | fuse_set_nowrite(inode); |
| 1667 | fuse_release_nowrite(inode); |
| 1668 | } |
| 1669 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1670 | if (is_truncate) { |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1671 | fuse_set_nowrite(inode); |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1672 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1673 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
| 1674 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1675 | } |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1676 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1677 | memset(&inarg, 0, sizeof(inarg)); |
Miklos Szeredi | 0e9663e | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 1678 | memset(&outarg, 0, sizeof(outarg)); |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1679 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1680 | if (file) { |
| 1681 | struct fuse_file *ff = file->private_data; |
| 1682 | inarg.valid |= FATTR_FH; |
| 1683 | inarg.fh = ff->fh; |
| 1684 | } |
Miklos Szeredi | f333211 | 2007-10-18 03:07:04 -0700 | [diff] [blame] | 1685 | if (attr->ia_valid & ATTR_SIZE) { |
| 1686 | /* For mandatory locking in truncate */ |
| 1687 | inarg.valid |= FATTR_LOCKOWNER; |
| 1688 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); |
| 1689 | } |
Miklos Szeredi | 7078187 | 2014-12-12 09:49:05 +0100 | [diff] [blame] | 1690 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
| 1691 | err = fuse_simple_request(fc, &args); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1692 | if (err) { |
| 1693 | if (err == -EINTR) |
| 1694 | fuse_invalidate_attr(inode); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1695 | goto error; |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1696 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1697 | |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1698 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
| 1699 | make_bad_inode(inode); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1700 | err = -EIO; |
| 1701 | goto error; |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1702 | } |
| 1703 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1704 | spin_lock(&fc->lock); |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1705 | /* the kernel maintains i_mtime locally */ |
Maxim Patlasov | 3ad22c6 | 2014-04-28 14:19:25 +0200 | [diff] [blame] | 1706 | if (trust_local_cmtime) { |
| 1707 | if (attr->ia_valid & ATTR_MTIME) |
| 1708 | inode->i_mtime = attr->ia_mtime; |
| 1709 | if (attr->ia_valid & ATTR_CTIME) |
| 1710 | inode->i_ctime = attr->ia_ctime; |
Miklos Szeredi | 1e18bda | 2014-04-28 14:19:23 +0200 | [diff] [blame] | 1711 | /* FIXME: clear I_DIRTY_SYNC? */ |
Maxim Patlasov | b0aa760 | 2013-12-26 19:51:11 +0400 | [diff] [blame] | 1712 | } |
| 1713 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1714 | fuse_change_attributes_common(inode, &outarg.attr, |
| 1715 | attr_timeout(&outarg)); |
| 1716 | oldsize = inode->i_size; |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1717 | /* see the comment in fuse_change_attributes() */ |
| 1718 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) |
| 1719 | i_size_write(inode, outarg.attr.size); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1720 | |
| 1721 | if (is_truncate) { |
| 1722 | /* NOTE: this may release/reacquire fc->lock */ |
| 1723 | __fuse_release_nowrite(inode); |
| 1724 | } |
| 1725 | spin_unlock(&fc->lock); |
| 1726 | |
| 1727 | /* |
| 1728 | * Only call invalidate_inode_pages2() after removing |
| 1729 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. |
| 1730 | */ |
Pavel Emelyanov | 8373200 | 2013-10-10 17:10:46 +0400 | [diff] [blame] | 1731 | if ((is_truncate || !is_wb) && |
| 1732 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 1733 | truncate_pagecache(inode, outarg.attr.size); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1734 | invalidate_inode_pages2(inode->i_mapping); |
| 1735 | } |
| 1736 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1737 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Miklos Szeredi | e00d2c2 | 2007-10-16 23:31:01 -0700 | [diff] [blame] | 1738 | return 0; |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1739 | |
| 1740 | error: |
| 1741 | if (is_truncate) |
| 1742 | fuse_release_nowrite(inode); |
| 1743 | |
Maxim Patlasov | 06a7c3c | 2013-08-30 17:06:04 +0400 | [diff] [blame] | 1744 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 1745 | return err; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1746 | } |
| 1747 | |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1748 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
| 1749 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1750 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 5e940c1 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1751 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | a09f99e | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1752 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1753 | int ret; |
Maxim Patlasov | efb9fa9 | 2012-12-18 14:05:08 +0400 | [diff] [blame] | 1754 | |
| 1755 | if (!fuse_allow_current_process(get_fuse_conn(inode))) |
| 1756 | return -EACCES; |
| 1757 | |
Miklos Szeredi | a09f99e | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1758 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
Miklos Szeredi | a09f99e | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1759 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
| 1760 | ATTR_MODE); |
Miklos Szeredi | a09f99e | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1761 | |
Miklos Szeredi | 5e940c1 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1762 | /* |
| 1763 | * The only sane way to reliably kill suid/sgid is to do it in |
| 1764 | * the userspace filesystem |
| 1765 | * |
| 1766 | * This should be done on write(), truncate() and chown(). |
| 1767 | */ |
| 1768 | if (!fc->handle_killpriv) { |
Miklos Szeredi | 5e940c1 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1769 | /* |
| 1770 | * ia_mode calculation may have used stale i_mode. |
| 1771 | * Refresh and recalculate. |
| 1772 | */ |
| 1773 | ret = fuse_do_getattr(inode, NULL, file); |
| 1774 | if (ret) |
| 1775 | return ret; |
| 1776 | |
| 1777 | attr->ia_mode = inode->i_mode; |
Miklos Szeredi | c01638f | 2016-12-06 16:18:45 +0100 | [diff] [blame] | 1778 | if (inode->i_mode & S_ISUID) { |
Miklos Szeredi | 5e940c1 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1779 | attr->ia_valid |= ATTR_MODE; |
| 1780 | attr->ia_mode &= ~S_ISUID; |
| 1781 | } |
Miklos Szeredi | c01638f | 2016-12-06 16:18:45 +0100 | [diff] [blame] | 1782 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
Miklos Szeredi | 5e940c1 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1783 | attr->ia_valid |= ATTR_MODE; |
| 1784 | attr->ia_mode &= ~S_ISGID; |
| 1785 | } |
Miklos Szeredi | a09f99e | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1786 | } |
| 1787 | } |
| 1788 | if (!attr->ia_valid) |
| 1789 | return 0; |
| 1790 | |
Linus Torvalds | abb5a14 | 2016-10-10 13:04:49 -0700 | [diff] [blame] | 1791 | ret = fuse_do_setattr(entry, attr, file); |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1792 | if (!ret) { |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 1793 | /* |
| 1794 | * If filesystem supports acls it may have updated acl xattrs in |
| 1795 | * the filesystem, so forget cached acls for the inode. |
| 1796 | */ |
| 1797 | if (fc->posix_acl) |
| 1798 | forget_all_cached_acls(inode); |
| 1799 | |
Miklos Szeredi | 5e2b882 | 2016-10-01 07:32:32 +0200 | [diff] [blame] | 1800 | /* Directory mode changed, may need to revalidate access */ |
| 1801 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) |
| 1802 | fuse_invalidate_entry_cache(entry); |
| 1803 | } |
| 1804 | return ret; |
Miklos Szeredi | 49d4914 | 2007-10-18 03:07:00 -0700 | [diff] [blame] | 1805 | } |
| 1806 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1807 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
| 1808 | struct kstat *stat) |
| 1809 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1810 | struct inode *inode = d_inode(entry); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1811 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1812 | |
Anatol Pomozov | c2132c1 | 2013-01-14 22:30:00 -0800 | [diff] [blame] | 1813 | if (!fuse_allow_current_process(fc)) |
Miklos Szeredi | 244f638 | 2007-10-16 23:31:02 -0700 | [diff] [blame] | 1814 | return -EACCES; |
| 1815 | |
Miklos Szeredi | bcb4be8 | 2007-11-28 16:21:59 -0800 | [diff] [blame] | 1816 | return fuse_update_attributes(inode, stat, NULL, NULL); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1817 | } |
| 1818 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1819 | static const struct inode_operations fuse_dir_inode_operations = { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1820 | .lookup = fuse_lookup, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1821 | .mkdir = fuse_mkdir, |
| 1822 | .symlink = fuse_symlink, |
| 1823 | .unlink = fuse_unlink, |
| 1824 | .rmdir = fuse_rmdir, |
Miklos Szeredi | 2773bf0 | 2016-09-27 11:03:58 +0200 | [diff] [blame] | 1825 | .rename = fuse_rename2, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1826 | .link = fuse_link, |
| 1827 | .setattr = fuse_setattr, |
| 1828 | .create = fuse_create, |
Miklos Szeredi | c8ccbe0 | 2012-06-05 15:10:22 +0200 | [diff] [blame] | 1829 | .atomic_open = fuse_atomic_open, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1830 | .mknod = fuse_mknod, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1831 | .permission = fuse_permission, |
| 1832 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1833 | .listxattr = fuse_listxattr, |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 1834 | .get_acl = fuse_get_acl, |
| 1835 | .set_acl = fuse_set_acl, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1836 | }; |
| 1837 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1838 | static const struct file_operations fuse_dir_operations = { |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 1839 | .llseek = generic_file_llseek, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1840 | .read = generic_read_dir, |
Al Viro | d9b3dbd | 2016-04-20 17:30:32 -0400 | [diff] [blame] | 1841 | .iterate_shared = fuse_readdir, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1842 | .open = fuse_dir_open, |
| 1843 | .release = fuse_dir_release, |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 1844 | .fsync = fuse_dir_fsync, |
Miklos Szeredi | b18da0c | 2011-12-13 11:58:49 +0100 | [diff] [blame] | 1845 | .unlocked_ioctl = fuse_dir_ioctl, |
| 1846 | .compat_ioctl = fuse_dir_compat_ioctl, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1847 | }; |
| 1848 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1849 | static const struct inode_operations fuse_common_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1850 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1851 | .permission = fuse_permission, |
| 1852 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1853 | .listxattr = fuse_listxattr, |
Seth Forshee | 60bcc88 | 2016-08-29 08:46:37 -0500 | [diff] [blame] | 1854 | .get_acl = fuse_get_acl, |
| 1855 | .set_acl = fuse_set_acl, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1856 | }; |
| 1857 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1858 | static const struct inode_operations fuse_symlink_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 1859 | .setattr = fuse_setattr, |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1860 | .get_link = fuse_get_link, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1861 | .readlink = generic_readlink, |
| 1862 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1863 | .listxattr = fuse_listxattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1864 | }; |
| 1865 | |
| 1866 | void fuse_init_common(struct inode *inode) |
| 1867 | { |
| 1868 | inode->i_op = &fuse_common_inode_operations; |
| 1869 | } |
| 1870 | |
| 1871 | void fuse_init_dir(struct inode *inode) |
| 1872 | { |
| 1873 | inode->i_op = &fuse_dir_inode_operations; |
| 1874 | inode->i_fop = &fuse_dir_operations; |
| 1875 | } |
| 1876 | |
| 1877 | void fuse_init_symlink(struct inode *inode) |
| 1878 | { |
| 1879 | inode->i_op = &fuse_symlink_inode_operations; |
| 1880 | } |