Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * proc/fs/generic.c --- generic routines for the proc-fs |
| 3 | * |
| 4 | * This file contains generic proc-fs routines for handling |
| 5 | * directories and files. |
| 6 | * |
| 7 | * Copyright (C) 1991, 1992 Linus Torvalds. |
| 8 | * Copyright (C) 1997 Theodore Ts'o |
| 9 | */ |
| 10 | |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/time.h> |
| 13 | #include <linux/proc_fs.h> |
| 14 | #include <linux/stat.h> |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 15 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Andrew Morton | 87ebdc0 | 2013-02-27 17:03:16 -0800 | [diff] [blame] | 18 | #include <linux/printk.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/init.h> |
| 21 | #include <linux/idr.h> |
| 22 | #include <linux/namei.h> |
| 23 | #include <linux/bitops.h> |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
Alexey Dobriyan | 786d7e1 | 2007-07-15 23:39:00 -0700 | [diff] [blame] | 25 | #include <linux/completion.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | |
Adrian Bunk | fee781e | 2006-01-08 01:04:16 -0800 | [diff] [blame] | 28 | #include "internal.h" |
| 29 | |
Alexey Dobriyan | 4dcc03f | 2014-08-08 14:21:29 -0700 | [diff] [blame] | 30 | static DEFINE_SPINLOCK(proc_subdir_lock); |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 31 | |
Alexey Dobriyan | 312ec7e | 2011-03-23 16:42:52 -0700 | [diff] [blame] | 32 | static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | { |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 34 | if (len < de->namelen) |
| 35 | return -1; |
| 36 | if (len > de->namelen) |
| 37 | return 1; |
| 38 | |
| 39 | return memcmp(name, de->name, len); |
| 40 | } |
| 41 | |
| 42 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) |
| 43 | { |
Nicolas Dichtel | 2fc1e94 | 2014-12-10 15:45:07 -0800 | [diff] [blame] | 44 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
| 45 | subdir_node); |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) |
| 49 | { |
Nicolas Dichtel | 2fc1e94 | 2014-12-10 15:45:07 -0800 | [diff] [blame] | 50 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
| 51 | subdir_node); |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, |
| 55 | const char *name, |
| 56 | unsigned int len) |
| 57 | { |
| 58 | struct rb_node *node = dir->subdir.rb_node; |
| 59 | |
| 60 | while (node) { |
| 61 | struct proc_dir_entry *de = container_of(node, |
| 62 | struct proc_dir_entry, |
| 63 | subdir_node); |
| 64 | int result = proc_match(len, name, de); |
| 65 | |
| 66 | if (result < 0) |
| 67 | node = node->rb_left; |
| 68 | else if (result > 0) |
| 69 | node = node->rb_right; |
| 70 | else |
| 71 | return de; |
| 72 | } |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | static bool pde_subdir_insert(struct proc_dir_entry *dir, |
| 77 | struct proc_dir_entry *de) |
| 78 | { |
| 79 | struct rb_root *root = &dir->subdir; |
| 80 | struct rb_node **new = &root->rb_node, *parent = NULL; |
| 81 | |
| 82 | /* Figure out where to put new node */ |
| 83 | while (*new) { |
| 84 | struct proc_dir_entry *this = |
| 85 | container_of(*new, struct proc_dir_entry, subdir_node); |
| 86 | int result = proc_match(de->namelen, de->name, this); |
| 87 | |
| 88 | parent = *new; |
| 89 | if (result < 0) |
| 90 | new = &(*new)->rb_left; |
| 91 | else if (result > 0) |
| 92 | new = &(*new)->rb_right; |
| 93 | else |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | /* Add new node and rebalance tree. */ |
| 98 | rb_link_node(&de->subdir_node, parent, new); |
| 99 | rb_insert_color(&de->subdir_node, root); |
| 100 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | } |
| 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
| 104 | { |
| 105 | struct inode *inode = dentry->d_inode; |
| 106 | struct proc_dir_entry *de = PDE(inode); |
| 107 | int error; |
| 108 | |
| 109 | error = inode_change_ok(inode, iattr); |
| 110 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 111 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 113 | setattr_copy(inode, iattr); |
| 114 | mark_inode_dirty(inode); |
Marco Stornelli | 46f6955 | 2012-12-15 11:48:48 +0100 | [diff] [blame] | 115 | |
Rui Xiang | cdf7e8d | 2014-01-23 15:55:41 -0800 | [diff] [blame] | 116 | proc_set_user(de, inode->i_uid, inode->i_gid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | de->mode = inode->i_mode; |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 118 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
Miklos Szeredi | 2b579be | 2005-09-06 15:17:18 -0700 | [diff] [blame] | 121 | static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 122 | struct kstat *stat) |
| 123 | { |
| 124 | struct inode *inode = dentry->d_inode; |
| 125 | struct proc_dir_entry *de = PROC_I(inode)->pde; |
| 126 | if (de && de->nlink) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 127 | set_nlink(inode, de->nlink); |
Miklos Szeredi | 2b579be | 2005-09-06 15:17:18 -0700 | [diff] [blame] | 128 | |
| 129 | generic_fillattr(inode, stat); |
| 130 | return 0; |
| 131 | } |
| 132 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 133 | static const struct inode_operations proc_file_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | .setattr = proc_notify_change, |
| 135 | }; |
| 136 | |
| 137 | /* |
| 138 | * This function parses a name such as "tty/driver/serial", and |
| 139 | * returns the struct proc_dir_entry for "/proc/tty/driver", and |
| 140 | * returns "serial" in residual. |
| 141 | */ |
Alexey Dobriyan | e17a576 | 2010-03-05 13:43:59 -0800 | [diff] [blame] | 142 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
| 143 | const char **residual) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
| 145 | const char *cp = name, *next; |
| 146 | struct proc_dir_entry *de; |
Alexey Dobriyan | 312ec7e | 2011-03-23 16:42:52 -0700 | [diff] [blame] | 147 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Alexey Dobriyan | 7cee4e0 | 2008-04-29 01:01:40 -0700 | [diff] [blame] | 149 | de = *ret; |
| 150 | if (!de) |
| 151 | de = &proc_root; |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | while (1) { |
| 154 | next = strchr(cp, '/'); |
| 155 | if (!next) |
| 156 | break; |
| 157 | |
| 158 | len = next - cp; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 159 | de = pde_subdir_find(de, cp, len); |
Alexey Dobriyan | 12bac0d | 2010-03-05 13:44:00 -0800 | [diff] [blame] | 160 | if (!de) { |
| 161 | WARN(1, "name '%s'\n", name); |
Alexey Dobriyan | e17a576 | 2010-03-05 13:43:59 -0800 | [diff] [blame] | 162 | return -ENOENT; |
Alexey Dobriyan | 12bac0d | 2010-03-05 13:44:00 -0800 | [diff] [blame] | 163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | cp += len + 1; |
| 165 | } |
| 166 | *residual = cp; |
| 167 | *ret = de; |
Alexey Dobriyan | e17a576 | 2010-03-05 13:43:59 -0800 | [diff] [blame] | 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
| 172 | const char **residual) |
| 173 | { |
| 174 | int rv; |
| 175 | |
| 176 | spin_lock(&proc_subdir_lock); |
| 177 | rv = __xlate_proc_name(name, ret, residual); |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 178 | spin_unlock(&proc_subdir_lock); |
Alexey Dobriyan | e17a576 | 2010-03-05 13:43:59 -0800 | [diff] [blame] | 179 | return rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | |
Alexey Dobriyan | 9a18540 | 2008-07-26 11:21:37 +0400 | [diff] [blame] | 182 | static DEFINE_IDA(proc_inum_ida); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */ |
| 184 | |
Alexey Dobriyan | 67935df | 2008-07-26 11:18:28 +0400 | [diff] [blame] | 185 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | /* |
| 188 | * Return an inode number between PROC_DYNAMIC_FIRST and |
| 189 | * 0xffffffff, or zero on failure. |
| 190 | */ |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 191 | int proc_alloc_inum(unsigned int *inum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
Alexey Dobriyan | 67935df | 2008-07-26 11:18:28 +0400 | [diff] [blame] | 193 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | int error; |
| 195 | |
| 196 | retry: |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 197 | if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) |
| 198 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 200 | spin_lock_irq(&proc_inum_lock); |
Alexey Dobriyan | 9a18540 | 2008-07-26 11:21:37 +0400 | [diff] [blame] | 201 | error = ida_get_new(&proc_inum_ida, &i); |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 202 | spin_unlock_irq(&proc_inum_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (error == -EAGAIN) |
| 204 | goto retry; |
| 205 | else if (error) |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 206 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Alexey Dobriyan | 67935df | 2008-07-26 11:18:28 +0400 | [diff] [blame] | 208 | if (i > UINT_MAX - PROC_DYNAMIC_FIRST) { |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 209 | spin_lock_irq(&proc_inum_lock); |
Alexey Dobriyan | 9a18540 | 2008-07-26 11:21:37 +0400 | [diff] [blame] | 210 | ida_remove(&proc_inum_ida, i); |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 211 | spin_unlock_irq(&proc_inum_lock); |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 212 | return -ENOSPC; |
Alexey Dobriyan | 67935df | 2008-07-26 11:18:28 +0400 | [diff] [blame] | 213 | } |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 214 | *inum = PROC_DYNAMIC_FIRST + i; |
| 215 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 218 | void proc_free_inum(unsigned int inum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 220 | unsigned long flags; |
| 221 | spin_lock_irqsave(&proc_inum_lock, flags); |
Alexey Dobriyan | 9a18540 | 2008-07-26 11:21:37 +0400 | [diff] [blame] | 222 | ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
Eric W. Biederman | dfb2ea4 | 2012-12-21 20:38:00 -0800 | [diff] [blame] | 223 | spin_unlock_irqrestore(&proc_inum_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 226 | static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
David Howells | c30480b | 2013-04-12 18:03:36 +0100 | [diff] [blame] | 228 | nd_set_link(nd, __PDE_DATA(dentry->d_inode)); |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 229 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 232 | static const struct inode_operations proc_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | .readlink = generic_readlink, |
| 234 | .follow_link = proc_follow_link, |
| 235 | }; |
| 236 | |
| 237 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | * Don't create negative dentries here, return -ENOENT by hand |
| 239 | * instead. |
| 240 | */ |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 241 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
| 242 | struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | { |
Al Viro | d3d009c | 2013-01-25 20:11:22 -0500 | [diff] [blame] | 244 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 246 | spin_lock(&proc_subdir_lock); |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 247 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
| 248 | if (de) { |
| 249 | pde_get(de); |
| 250 | spin_unlock(&proc_subdir_lock); |
| 251 | inode = proc_get_inode(dir->i_sb, de); |
| 252 | if (!inode) |
| 253 | return ERR_PTR(-ENOMEM); |
| 254 | d_set_d_op(dentry, &simple_dentry_operations); |
| 255 | d_add(dentry, inode); |
| 256 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 258 | spin_unlock(&proc_subdir_lock); |
Al Viro | d3d009c | 2013-01-25 20:11:22 -0500 | [diff] [blame] | 259 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 262 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 263 | unsigned int flags) |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 264 | { |
| 265 | return proc_lookup_de(PDE(dir), dir, dentry); |
| 266 | } |
| 267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | /* |
| 269 | * This returns non-zero if at EOF, so that the /proc |
| 270 | * root directory can use this and check if it should |
| 271 | * continue with the <pid> entries.. |
| 272 | * |
| 273 | * Note that the VFS-layer doesn't care about the return |
| 274 | * value of the readdir() call, as long as it's non-negative |
| 275 | * for success.. |
| 276 | */ |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 277 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
| 278 | struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 282 | if (!dir_emit_dots(file, ctx)) |
| 283 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 285 | spin_lock(&proc_subdir_lock); |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 286 | de = pde_subdir_first(de); |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 287 | i = ctx->pos - 2; |
| 288 | for (;;) { |
| 289 | if (!de) { |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 290 | spin_unlock(&proc_subdir_lock); |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | if (!i) |
| 294 | break; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 295 | de = pde_subdir_next(de); |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 296 | i--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 298 | |
| 299 | do { |
| 300 | struct proc_dir_entry *next; |
| 301 | pde_get(de); |
| 302 | spin_unlock(&proc_subdir_lock); |
| 303 | if (!dir_emit(ctx, de->name, de->namelen, |
| 304 | de->low_ino, de->mode >> 12)) { |
| 305 | pde_put(de); |
| 306 | return 0; |
| 307 | } |
| 308 | spin_lock(&proc_subdir_lock); |
| 309 | ctx->pos++; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 310 | next = pde_subdir_next(de); |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 311 | pde_put(de); |
| 312 | de = next; |
| 313 | } while (de); |
| 314 | spin_unlock(&proc_subdir_lock); |
Linus Torvalds | fd3930f | 2013-08-19 16:26:12 -0700 | [diff] [blame] | 315 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 318 | int proc_readdir(struct file *file, struct dir_context *ctx) |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 319 | { |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 320 | struct inode *inode = file_inode(file); |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 321 | |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 322 | return proc_readdir_de(PDE(inode), file, ctx); |
Pavel Emelyanov | e9720ac | 2008-03-07 11:08:40 -0800 | [diff] [blame] | 323 | } |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | /* |
| 326 | * These are the generic /proc directory operations. They |
| 327 | * use the in-memory "struct proc_dir_entry" tree to parse |
| 328 | * the /proc directory. |
| 329 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 330 | static const struct file_operations proc_dir_operations = { |
Alexey Dobriyan | b4df2b9 | 2008-10-27 22:48:36 +0300 | [diff] [blame] | 331 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | .read = generic_read_dir, |
Al Viro | f0c3b50 | 2013-05-16 12:07:31 -0400 | [diff] [blame] | 333 | .iterate = proc_readdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | }; |
| 335 | |
| 336 | /* |
| 337 | * proc directories can do almost nothing.. |
| 338 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 339 | static const struct inode_operations proc_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | .lookup = proc_lookup, |
Miklos Szeredi | 2b579be | 2005-09-06 15:17:18 -0700 | [diff] [blame] | 341 | .getattr = proc_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | .setattr = proc_notify_change, |
| 343 | }; |
| 344 | |
| 345 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) |
| 346 | { |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 347 | int ret; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 348 | |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 349 | ret = proc_alloc_inum(&dp->low_ino); |
| 350 | if (ret) |
| 351 | return ret; |
Steven Rostedt | 64a07bd | 2006-03-26 01:36:55 -0800 | [diff] [blame] | 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | if (S_ISDIR(dp->mode)) { |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 354 | dp->proc_fops = &proc_dir_operations; |
| 355 | dp->proc_iops = &proc_dir_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | dir->nlink++; |
| 357 | } else if (S_ISLNK(dp->mode)) { |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 358 | dp->proc_iops = &proc_link_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } else if (S_ISREG(dp->mode)) { |
David Howells | 3cb5bf1 | 2013-04-11 03:20:50 +0100 | [diff] [blame] | 360 | BUG_ON(dp->proc_fops == NULL); |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 361 | dp->proc_iops = &proc_file_inode_operations; |
| 362 | } else { |
| 363 | WARN_ON(1); |
Debabrata Banerjee | b208d54 | 2014-12-10 15:45:04 -0800 | [diff] [blame] | 364 | proc_free_inum(dp->low_ino); |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 365 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
Changli Gao | 99fc06d | 2007-07-15 23:40:09 -0700 | [diff] [blame] | 367 | |
| 368 | spin_lock(&proc_subdir_lock); |
Changli Gao | 99fc06d | 2007-07-15 23:40:09 -0700 | [diff] [blame] | 369 | dp->parent = dir; |
Debabrata Banerjee | b208d54 | 2014-12-10 15:45:04 -0800 | [diff] [blame] | 370 | if (pde_subdir_insert(dir, dp) == false) { |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 371 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
| 372 | dir->name, dp->name); |
Debabrata Banerjee | b208d54 | 2014-12-10 15:45:04 -0800 | [diff] [blame] | 373 | spin_unlock(&proc_subdir_lock); |
| 374 | if (S_ISDIR(dp->mode)) |
| 375 | dir->nlink--; |
| 376 | proc_free_inum(dp->low_ino); |
| 377 | return -EEXIST; |
| 378 | } |
Changli Gao | 99fc06d | 2007-07-15 23:40:09 -0700 | [diff] [blame] | 379 | spin_unlock(&proc_subdir_lock); |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | return 0; |
| 382 | } |
| 383 | |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 384 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | const char *name, |
Al Viro | d161a13 | 2011-07-24 03:36:29 -0400 | [diff] [blame] | 386 | umode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | nlink_t nlink) |
| 388 | { |
| 389 | struct proc_dir_entry *ent = NULL; |
Alexey Dobriyan | dbcdb50 | 2014-08-08 14:21:25 -0700 | [diff] [blame] | 390 | const char *fn; |
| 391 | struct qstr qstr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Alexey Dobriyan | 7cee4e0 | 2008-04-29 01:01:40 -0700 | [diff] [blame] | 393 | if (xlate_proc_name(name, parent, &fn) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | goto out; |
Alexey Dobriyan | dbcdb50 | 2014-08-08 14:21:25 -0700 | [diff] [blame] | 395 | qstr.name = fn; |
| 396 | qstr.len = strlen(fn); |
| 397 | if (qstr.len == 0 || qstr.len >= 256) { |
| 398 | WARN(1, "name len %u\n", qstr.len); |
| 399 | return NULL; |
| 400 | } |
| 401 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { |
| 402 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); |
| 403 | return NULL; |
| 404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Alexey Dobriyan | dbcdb50 | 2014-08-08 14:21:25 -0700 | [diff] [blame] | 406 | ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL); |
yan | 17baa2a | 2012-10-04 17:15:43 -0700 | [diff] [blame] | 407 | if (!ent) |
| 408 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Alexey Dobriyan | dbcdb50 | 2014-08-08 14:21:25 -0700 | [diff] [blame] | 410 | memcpy(ent->name, fn, qstr.len + 1); |
| 411 | ent->namelen = qstr.len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | ent->mode = mode; |
| 413 | ent->nlink = nlink; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 414 | ent->subdir = RB_ROOT; |
Alexey Dobriyan | 5a622f2 | 2007-12-04 23:45:28 -0800 | [diff] [blame] | 415 | atomic_set(&ent->count, 1); |
Alexey Dobriyan | 786d7e1 | 2007-07-15 23:39:00 -0700 | [diff] [blame] | 416 | spin_lock_init(&ent->pde_unload_lock); |
Alexey Dobriyan | 881adb8 | 2008-07-25 01:48:29 -0700 | [diff] [blame] | 417 | INIT_LIST_HEAD(&ent->pde_openers); |
yan | 17baa2a | 2012-10-04 17:15:43 -0700 | [diff] [blame] | 418 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return ent; |
| 420 | } |
| 421 | |
| 422 | struct proc_dir_entry *proc_symlink(const char *name, |
| 423 | struct proc_dir_entry *parent, const char *dest) |
| 424 | { |
| 425 | struct proc_dir_entry *ent; |
| 426 | |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 427 | ent = __proc_create(&parent, name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
| 429 | |
| 430 | if (ent) { |
| 431 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); |
| 432 | if (ent->data) { |
| 433 | strcpy((char*)ent->data,dest); |
| 434 | if (proc_register(parent, ent) < 0) { |
| 435 | kfree(ent->data); |
| 436 | kfree(ent); |
| 437 | ent = NULL; |
| 438 | } |
| 439 | } else { |
| 440 | kfree(ent); |
| 441 | ent = NULL; |
| 442 | } |
| 443 | } |
| 444 | return ent; |
| 445 | } |
Helight.Xu | 587d4a1 | 2009-12-30 13:24:41 +0800 | [diff] [blame] | 446 | EXPORT_SYMBOL(proc_symlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
David Howells | 270b5ac | 2013-04-12 02:48:30 +0100 | [diff] [blame] | 448 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
| 449 | struct proc_dir_entry *parent, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
| 451 | struct proc_dir_entry *ent; |
| 452 | |
David Howells | 270b5ac | 2013-04-12 02:48:30 +0100 | [diff] [blame] | 453 | if (mode == 0) |
| 454 | mode = S_IRUGO | S_IXUGO; |
| 455 | |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 456 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | if (ent) { |
David Howells | 270b5ac | 2013-04-12 02:48:30 +0100 | [diff] [blame] | 458 | ent->data = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | if (proc_register(parent, ent) < 0) { |
| 460 | kfree(ent); |
| 461 | ent = NULL; |
| 462 | } |
| 463 | } |
| 464 | return ent; |
| 465 | } |
David Howells | 270b5ac | 2013-04-12 02:48:30 +0100 | [diff] [blame] | 466 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
| 467 | |
| 468 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
| 469 | struct proc_dir_entry *parent) |
| 470 | { |
| 471 | return proc_mkdir_data(name, mode, parent, NULL); |
| 472 | } |
Alexey Dobriyan | 011159a | 2011-05-14 00:12:48 +0300 | [diff] [blame] | 473 | EXPORT_SYMBOL(proc_mkdir_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | struct proc_dir_entry *proc_mkdir(const char *name, |
| 476 | struct proc_dir_entry *parent) |
| 477 | { |
David Howells | 270b5ac | 2013-04-12 02:48:30 +0100 | [diff] [blame] | 478 | return proc_mkdir_data(name, 0, parent, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
Helight.Xu | 587d4a1 | 2009-12-30 13:24:41 +0800 | [diff] [blame] | 480 | EXPORT_SYMBOL(proc_mkdir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Al Viro | d161a13 | 2011-07-24 03:36:29 -0400 | [diff] [blame] | 482 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
Denis V. Lunev | 59b7435 | 2008-04-29 01:02:00 -0700 | [diff] [blame] | 483 | struct proc_dir_entry *parent, |
| 484 | const struct file_operations *proc_fops, |
| 485 | void *data) |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 486 | { |
| 487 | struct proc_dir_entry *pde; |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 488 | if ((mode & S_IFMT) == 0) |
| 489 | mode |= S_IFREG; |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 490 | |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 491 | if (!S_ISREG(mode)) { |
| 492 | WARN_ON(1); /* use proc_mkdir() */ |
| 493 | return NULL; |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 494 | } |
| 495 | |
Al Viro | b6cdc73 | 2013-03-30 21:20:14 -0400 | [diff] [blame] | 496 | if ((mode & S_IALLUGO) == 0) |
| 497 | mode |= S_IRUGO; |
| 498 | pde = __proc_create(&parent, name, mode, 1); |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 499 | if (!pde) |
| 500 | goto out; |
| 501 | pde->proc_fops = proc_fops; |
Denis V. Lunev | 59b7435 | 2008-04-29 01:02:00 -0700 | [diff] [blame] | 502 | pde->data = data; |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 503 | if (proc_register(parent, pde) < 0) |
| 504 | goto out_free; |
| 505 | return pde; |
| 506 | out_free: |
| 507 | kfree(pde); |
| 508 | out: |
| 509 | return NULL; |
| 510 | } |
Helight.Xu | 587d4a1 | 2009-12-30 13:24:41 +0800 | [diff] [blame] | 511 | EXPORT_SYMBOL(proc_create_data); |
David Howells | 271a15e | 2013-04-12 00:38:51 +0100 | [diff] [blame] | 512 | |
| 513 | void proc_set_size(struct proc_dir_entry *de, loff_t size) |
| 514 | { |
| 515 | de->size = size; |
| 516 | } |
| 517 | EXPORT_SYMBOL(proc_set_size); |
| 518 | |
| 519 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) |
| 520 | { |
| 521 | de->uid = uid; |
| 522 | de->gid = gid; |
| 523 | } |
| 524 | EXPORT_SYMBOL(proc_set_user); |
Alexey Dobriyan | 2d3a4e3 | 2008-02-08 04:18:37 -0800 | [diff] [blame] | 525 | |
Alexey Dobriyan | 135d565 | 2009-12-15 16:45:39 -0800 | [diff] [blame] | 526 | static void free_proc_entry(struct proc_dir_entry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
Eric W. Biederman | 33d6dce | 2011-06-17 13:33:20 -0700 | [diff] [blame] | 528 | proc_free_inum(de->low_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Alexey Dobriyan | fd2cbe4 | 2008-02-08 04:18:28 -0800 | [diff] [blame] | 530 | if (S_ISLNK(de->mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | kfree(de->data); |
| 532 | kfree(de); |
| 533 | } |
| 534 | |
Alexey Dobriyan | 135d565 | 2009-12-15 16:45:39 -0800 | [diff] [blame] | 535 | void pde_put(struct proc_dir_entry *pde) |
| 536 | { |
| 537 | if (atomic_dec_and_test(&pde->count)) |
| 538 | free_proc_entry(pde); |
| 539 | } |
| 540 | |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 541 | /* |
| 542 | * Remove a /proc entry and free it if it's not currently in use. |
| 543 | */ |
| 544 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) |
| 545 | { |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 546 | struct proc_dir_entry *de = NULL; |
| 547 | const char *fn = name; |
| 548 | unsigned int len; |
| 549 | |
| 550 | spin_lock(&proc_subdir_lock); |
| 551 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
| 552 | spin_unlock(&proc_subdir_lock); |
| 553 | return; |
| 554 | } |
| 555 | len = strlen(fn); |
| 556 | |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 557 | de = pde_subdir_find(parent, fn, len); |
| 558 | if (de) |
| 559 | rb_erase(&de->subdir_node, &parent->subdir); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 560 | spin_unlock(&proc_subdir_lock); |
| 561 | if (!de) { |
| 562 | WARN(1, "name '%s'\n", name); |
| 563 | return; |
| 564 | } |
| 565 | |
Al Viro | 866ad9a | 2013-04-03 19:07:30 -0400 | [diff] [blame] | 566 | proc_entry_rundown(de); |
Alexey Dobriyan | 881adb8 | 2008-07-25 01:48:29 -0700 | [diff] [blame] | 567 | |
Alexey Dobriyan | f649d6d | 2008-04-29 01:01:39 -0700 | [diff] [blame] | 568 | if (S_ISDIR(de->mode)) |
| 569 | parent->nlink--; |
| 570 | de->nlink = 0; |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 571 | WARN(pde_subdir_first(de), |
| 572 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", |
| 573 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); |
Alexey Dobriyan | 135d565 | 2009-12-15 16:45:39 -0800 | [diff] [blame] | 574 | pde_put(de); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
Helight.Xu | 587d4a1 | 2009-12-30 13:24:41 +0800 | [diff] [blame] | 576 | EXPORT_SYMBOL(remove_proc_entry); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 577 | |
| 578 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) |
| 579 | { |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 580 | struct proc_dir_entry *root = NULL, *de, *next; |
| 581 | const char *fn = name; |
| 582 | unsigned int len; |
| 583 | |
| 584 | spin_lock(&proc_subdir_lock); |
| 585 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
| 586 | spin_unlock(&proc_subdir_lock); |
| 587 | return -ENOENT; |
| 588 | } |
| 589 | len = strlen(fn); |
| 590 | |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 591 | root = pde_subdir_find(parent, fn, len); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 592 | if (!root) { |
| 593 | spin_unlock(&proc_subdir_lock); |
| 594 | return -ENOENT; |
| 595 | } |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 596 | rb_erase(&root->subdir_node, &parent->subdir); |
| 597 | |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 598 | de = root; |
| 599 | while (1) { |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 600 | next = pde_subdir_first(de); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 601 | if (next) { |
Nicolas Dichtel | 710585d | 2014-12-10 15:45:01 -0800 | [diff] [blame] | 602 | rb_erase(&next->subdir_node, &de->subdir); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 603 | de = next; |
| 604 | continue; |
| 605 | } |
| 606 | spin_unlock(&proc_subdir_lock); |
| 607 | |
Al Viro | 866ad9a | 2013-04-03 19:07:30 -0400 | [diff] [blame] | 608 | proc_entry_rundown(de); |
Al Viro | 8ce584c | 2013-03-30 20:13:46 -0400 | [diff] [blame] | 609 | next = de->parent; |
| 610 | if (S_ISDIR(de->mode)) |
| 611 | next->nlink--; |
| 612 | de->nlink = 0; |
| 613 | if (de == root) |
| 614 | break; |
| 615 | pde_put(de); |
| 616 | |
| 617 | spin_lock(&proc_subdir_lock); |
| 618 | de = next; |
| 619 | } |
| 620 | pde_put(root); |
| 621 | return 0; |
| 622 | } |
| 623 | EXPORT_SYMBOL(remove_proc_subtree); |
David Howells | 4a520d2 | 2013-04-12 14:06:01 +0100 | [diff] [blame] | 624 | |
| 625 | void *proc_get_parent_data(const struct inode *inode) |
| 626 | { |
| 627 | struct proc_dir_entry *de = PDE(inode); |
| 628 | return de->parent->data; |
| 629 | } |
| 630 | EXPORT_SYMBOL_GPL(proc_get_parent_data); |
David Howells | a8ca16e | 2013-04-12 17:27:28 +0100 | [diff] [blame] | 631 | |
| 632 | void proc_remove(struct proc_dir_entry *de) |
| 633 | { |
| 634 | if (de) |
| 635 | remove_proc_subtree(de->name, de->parent); |
| 636 | } |
| 637 | EXPORT_SYMBOL(proc_remove); |
David Howells | c30480b | 2013-04-12 18:03:36 +0100 | [diff] [blame] | 638 | |
| 639 | void *PDE_DATA(const struct inode *inode) |
| 640 | { |
| 641 | return __PDE_DATA(inode); |
| 642 | } |
| 643 | EXPORT_SYMBOL(PDE_DATA); |