^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2001-2006 Ian Kent <raven@themaw.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "autofs_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static int autofs_dir_symlink(struct inode *, struct dentry *, const char *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static int autofs_dir_unlink(struct inode *, struct dentry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static int autofs_dir_rmdir(struct inode *, struct dentry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static int autofs_dir_mkdir(struct inode *, struct dentry *, umode_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static long autofs_root_compat_ioctl(struct file *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned int, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int autofs_dir_open(struct inode *inode, struct file *file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static struct dentry *autofs_lookup(struct inode *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct dentry *, unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static struct vfsmount *autofs_d_automount(struct path *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int autofs_d_manage(const struct path *, bool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static void autofs_dentry_release(struct dentry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) const struct file_operations autofs_root_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .open = dcache_dir_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .release = dcache_dir_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .read = generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .iterate_shared = dcache_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) .llseek = dcache_dir_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) .unlocked_ioctl = autofs_root_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .compat_ioctl = autofs_root_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) const struct file_operations autofs_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) .open = autofs_dir_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .release = dcache_dir_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .read = generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .iterate_shared = dcache_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .llseek = dcache_dir_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) const struct inode_operations autofs_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .lookup = autofs_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .unlink = autofs_dir_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .symlink = autofs_dir_symlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .mkdir = autofs_dir_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .rmdir = autofs_dir_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) const struct dentry_operations autofs_dentry_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) .d_automount = autofs_d_automount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .d_manage = autofs_d_manage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .d_release = autofs_dentry_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static void autofs_del_active(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) list_del_init(&ino->active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static int autofs_dir_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct dentry *dentry = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pr_debug("file=%p dentry=%p %pd\n", file, dentry, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * An empty directory in an autofs file system is always a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * mount point. The daemon must have failed to mount this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * during lookup so it doesn't exist. This can happen, for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * example, if user space returns an incorrect status for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * mount request. Otherwise we're doing a readdir on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * autofs file system so just let the libfs routines handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!path_is_mountpoint(&file->f_path) && simple_empty(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return dcache_dir_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static void autofs_dentry_release(struct dentry *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct autofs_info *ino = autofs_dentry_ino(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct autofs_sb_info *sbi = autofs_sbi(de->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) pr_debug("releasing %p\n", de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (!ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (sbi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!list_empty(&ino->active))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) list_del(&ino->active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!list_empty(&ino->expiring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) list_del(&ino->expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) autofs_free_ino(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static struct dentry *autofs_lookup_active(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct dentry *parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) const struct qstr *name = &dentry->d_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned int len = name->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned int hash = name->hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) const unsigned char *str = name->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct list_head *p, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) head = &sbi->active_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (list_empty(head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) list_for_each(p, head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct dentry *active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) const struct qstr *qstr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ino = list_entry(p, struct autofs_info, active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) active = ino->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) spin_lock(&active->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* Already gone? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if ((int) d_count(active) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) qstr = &active->d_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (active->d_name.hash != hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (active->d_parent != parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (qstr->len != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (memcmp(qstr->name, str, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (d_unhashed(active)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) dget_dlock(active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) spin_unlock(&active->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) spin_unlock(&active->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static struct dentry *autofs_lookup_expiring(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) bool rcu_walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct dentry *parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) const struct qstr *name = &dentry->d_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) unsigned int len = name->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) unsigned int hash = name->hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) const unsigned char *str = name->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct list_head *p, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) head = &sbi->expiring_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (list_empty(head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) list_for_each(p, head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct dentry *expiring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) const struct qstr *qstr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (rcu_walk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return ERR_PTR(-ECHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ino = list_entry(p, struct autofs_info, expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) expiring = ino->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) spin_lock(&expiring->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* We've already been dentry_iput or unlinked */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (d_really_is_negative(expiring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) qstr = &expiring->d_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (expiring->d_name.hash != hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (expiring->d_parent != parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (qstr->len != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (memcmp(qstr->name, str, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (d_unhashed(expiring)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) dget_dlock(expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) spin_unlock(&expiring->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return expiring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) spin_unlock(&expiring->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static int autofs_mount_wait(const struct path *path, bool rcu_walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct autofs_sb_info *sbi = autofs_sbi(path->dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct autofs_info *ino = autofs_dentry_ino(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (ino->flags & AUTOFS_INF_PENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (rcu_walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) pr_debug("waiting for mount name=%pd\n", path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) status = autofs_wait(sbi, path, NFY_MOUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) pr_debug("mount wait done status=%d\n", status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) ino->last_used = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!(sbi->flags & AUTOFS_SBI_STRICTEXPIRE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) ino->last_used = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static int do_expire_wait(const struct path *path, bool rcu_walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct dentry *expiring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) expiring = autofs_lookup_expiring(dentry, rcu_walk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (IS_ERR(expiring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return PTR_ERR(expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (!expiring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return autofs_expire_wait(path, rcu_walk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) const struct path this = { .mnt = path->mnt, .dentry = expiring };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * If we are racing with expire the request might not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * be quite complete, but the directory has been removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * so it must have been successful, just wait for it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) autofs_expire_wait(&this, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) autofs_del_expiring(expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) dput(expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static struct dentry *autofs_mountpoint_changed(struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * If this is an indirect mount the dentry could have gone away
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * as a result of an expire and a new one created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) struct dentry *parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) struct dentry *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) new = d_lookup(parent, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) ino = autofs_dentry_ino(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ino->last_used = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) dput(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) path->dentry = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static struct vfsmount *autofs_d_automount(struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) pr_debug("dentry=%p %pd\n", dentry, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /* The daemon never triggers a mount. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * If an expire request is pending everyone must wait.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * If the expire fails we're still mounted so continue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * the follow and return. A return of -EAGAIN (which only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * happens with indirect mounts) means the expire completed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * and the directory was removed, so just go ahead and try
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * the mount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) status = do_expire_wait(path, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (status && status != -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) /* Callback to the daemon to perform the mount or wait */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) spin_lock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (ino->flags & AUTOFS_INF_PENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) status = autofs_mount_wait(path, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return ERR_PTR(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * If the dentry is a symlink it's equivalent to a directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * having path_is_mountpoint() true, so there's no need to call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * back to the daemon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (!path_is_mountpoint(path)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * It's possible that user space hasn't removed directories
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * after umounting a rootless multi-mount, although it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * should. For v5 path_has_submounts() is sufficient to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * handle this because the leaves of the directory tree under
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * the mount never trigger mounts themselves (they have an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * autofs trigger mount mounted on them). But v4 pseudo direct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * mounts do need the leaves to trigger mounts. In this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * we have no choice but to use the list_empty() check and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * require user space behave.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (sbi->version > 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (path_has_submounts(path)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (!simple_empty(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) ino->flags |= AUTOFS_INF_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) status = autofs_mount_wait(path, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) spin_lock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) ino->flags &= ~AUTOFS_INF_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) return ERR_PTR(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /* Mount succeeded, check if we ended up with a new dentry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) dentry = autofs_mountpoint_changed(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int autofs_d_manage(const struct path *path, bool rcu_walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) pr_debug("dentry=%p %pd\n", dentry, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /* The daemon never waits. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (autofs_oz_mode(sbi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!path_is_mountpoint(path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) return -EISDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /* Wait for pending expires */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (do_expire_wait(path, rcu_walk) == -ECHILD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * This dentry may be under construction so wait on mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * completion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) status = autofs_mount_wait(path, rcu_walk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (rcu_walk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /* We don't need fs_lock in rcu_walk mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * just testing 'AUTOFS_INFO_NO_RCU' is enough.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * simple_empty() takes a spinlock, so leave it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * to last.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * We only return -EISDIR when certain this isn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * a mount-trap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (path_is_mountpoint(path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) inode = d_inode_rcu(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) if (inode && S_ISLNK(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return -EISDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) if (list_empty(&dentry->d_subdirs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (!simple_empty(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return -EISDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) spin_lock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * If the dentry has been selected for expire while we slept
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * on the lock then it might go away. We'll deal with that in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * ->d_automount() and wait on a new mount if the expire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * succeeds or return here if it doesn't (since there's no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * mount to follow with a rootless multi-mount).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) * Any needed mounting has been completed and the path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * updated so check if this is a rootless multi-mount so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) * we can avoid needless calls ->d_automount() and avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * an incorrect ELOOP error return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if ((!path_is_mountpoint(path) && !simple_empty(dentry)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) (d_really_is_positive(dentry) && d_is_symlink(dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) status = -EISDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) /* Lookups in the root directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) static struct dentry *autofs_lookup(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) struct autofs_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct dentry *active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) pr_debug("name = %pd\n", dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) /* File name too long to exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (dentry->d_name.len > NAME_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sbi = autofs_sbi(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) current->pid, task_pgrp_nr(current),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) sbi->flags & AUTOFS_SBI_CATATONIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) autofs_oz_mode(sbi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) active = autofs_lookup_active(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) return active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * A dentry that is not within the root can never trigger a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * mount operation, unless the directory already exists, so we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * can return fail immediately. The daemon however does need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * to create directories within the file system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (!autofs_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) ino = autofs_new_ino(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (!ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) spin_lock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /* Mark entries in the root as mount triggers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (IS_ROOT(dentry->d_parent) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) autofs_type_indirect(sbi->type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) __managed_dentry_set_managed(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) dentry->d_fsdata = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) ino->dentry = dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) list_add(&ino->active, &sbi->active_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) spin_unlock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) static int autofs_dir_symlink(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) const char *symname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) struct autofs_info *p_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) size_t size = strlen(symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) char *cp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) pr_debug("%s <- %pd\n", symname, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (!autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /* autofs_oz_mode() needs to allow path walks when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * autofs mount is catatonic but the state of an autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * file system needs to be preserved over restarts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (sbi->flags & AUTOFS_SBI_CATATONIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) BUG_ON(!ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) autofs_clean_ino(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) autofs_del_active(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) cp = kmalloc(size + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (!cp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) strcpy(cp, symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) inode = autofs_get_inode(dir->i_sb, S_IFLNK | 0555);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) kfree(cp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) inode->i_private = cp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) inode->i_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) d_add(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) dget(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) ino->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) p_ino = autofs_dentry_ino(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) p_ino->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * NOTE!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * Normal filesystems would do a "d_delete()" to tell the VFS dcache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * that the file no longer exists. However, doing that means that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) * VFS layer can turn the dentry into a negative dentry. We don't want
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * this, because the unlink is probably the result of an expire.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * We simply d_drop it and add it to a expiring list in the super block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * which allows the dentry lookup to check for an incomplete expire.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * If a process is blocked on the dentry waiting for the expire to finish,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) * it will invalidate the dentry and try to mount with a new one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) * Also see autofs_dir_rmdir()..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct autofs_info *p_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (!autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) /* autofs_oz_mode() needs to allow path walks when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * autofs mount is catatonic but the state of an autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * file system needs to be preserved over restarts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (sbi->flags & AUTOFS_SBI_CATATONIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) ino->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) p_ino = autofs_dentry_ino(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) p_ino->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) dput(ino->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) d_inode(dentry)->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) clear_nlink(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) __autofs_add_expiring(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * Version 4 of autofs provides a pseudo direct mount implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) * that relies on directories at the leaves of a directory tree under
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) * an indirect mount to trigger mounts. To allow for this we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * of the directory tree. There is no need to clear the automount flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * following a mount or restore it after an expire because these mounts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * are always covered. However, it is necessary to ensure that these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) * flags are clear on non-empty directories to avoid unnecessary calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * during path walks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) static void autofs_set_leaf_automount_flags(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) struct dentry *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) /* root and dentrys in the root are already handled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) if (IS_ROOT(dentry->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) managed_dentry_set_managed(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) /* only consider parents below dentrys in the root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (IS_ROOT(parent->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) managed_dentry_clear_managed(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) struct dentry *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* flags for dentrys in the root are handled elsewhere */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (IS_ROOT(dentry->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) managed_dentry_clear_managed(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /* only consider parents below dentrys in the root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) if (IS_ROOT(parent->d_parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (autofs_dentry_ino(parent)->count == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) managed_dentry_set_managed(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) static int autofs_dir_rmdir(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) struct autofs_info *p_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) pr_debug("dentry %p, removing %pd\n", dentry, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (!autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /* autofs_oz_mode() needs to allow path walks when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) * autofs mount is catatonic but the state of an autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * file system needs to be preserved over restarts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (sbi->flags & AUTOFS_SBI_CATATONIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) if (ino->count != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) return -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) spin_lock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) __autofs_add_expiring(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) spin_unlock(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) if (sbi->version < 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) autofs_clear_leaf_automount_flags(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) ino->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) p_ino = autofs_dentry_ino(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) p_ino->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) dput(ino->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) d_inode(dentry)->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) clear_nlink(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) if (dir->i_nlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) drop_nlink(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) static int autofs_dir_mkdir(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) struct autofs_info *ino = autofs_dentry_ino(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) struct autofs_info *p_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) if (!autofs_oz_mode(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) /* autofs_oz_mode() needs to allow path walks when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) * autofs mount is catatonic but the state of an autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) * file system needs to be preserved over restarts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) if (sbi->flags & AUTOFS_SBI_CATATONIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) pr_debug("dentry %p, creating %pd\n", dentry, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) BUG_ON(!ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) autofs_clean_ino(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) autofs_del_active(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) inode = autofs_get_inode(dir->i_sb, S_IFDIR | mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) d_add(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (sbi->version < 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) autofs_set_leaf_automount_flags(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) dget(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) ino->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) p_ino = autofs_dentry_ino(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) p_ino->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) inc_nlink(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) /* Get/set timeout ioctl() operation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) compat_ulong_t __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) unsigned long ntimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) rv = get_user(ntimeout, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) rv = put_user(sbi->exp_timeout/HZ, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) if (ntimeout > UINT_MAX/HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) sbi->exp_timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) sbi->exp_timeout = ntimeout * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) unsigned long __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) unsigned long ntimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) rv = get_user(ntimeout, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) rv = put_user(sbi->exp_timeout/HZ, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if (ntimeout > ULONG_MAX/HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) sbi->exp_timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) sbi->exp_timeout = ntimeout * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) /* Return protocol version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) static inline int autofs_get_protover(struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) int __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) return put_user(sbi->version, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) /* Return protocol sub version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) static inline int autofs_get_protosubver(struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) int __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) return put_user(sbi->sub_version, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * Tells the daemon whether it can umount the autofs mount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) static inline int autofs_ask_umount(struct vfsmount *mnt, int __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) int status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) if (may_umount(mnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) status = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) pr_debug("may umount %d\n", status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) status = put_user(status, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /* Identify autofs_dentries - this is so we can tell if there's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * an extra dentry refcount or not. We only hold a refcount on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) * dentry if its non-negative (ie, d_inode != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) int is_autofs_dentry(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) return dentry && d_really_is_positive(dentry) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) dentry->d_op == &autofs_dentry_operations &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) dentry->d_fsdata != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) * ioctl()'s on the root directory is the chief method for the daemon to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) * generate kernel reactions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) static int autofs_root_ioctl_unlocked(struct inode *inode, struct file *filp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) void __user *p = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) cmd, arg, sbi, task_pgrp_nr(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) return autofs_wait_release(sbi, (autofs_wqt_t) arg, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) return autofs_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) autofs_catatonic_mode(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) case AUTOFS_IOC_PROTOVER: /* Get protocol version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) return autofs_get_protover(sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) return autofs_get_protosubver(sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) case AUTOFS_IOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) return autofs_get_set_timeout(sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) case AUTOFS_IOC_SETTIMEOUT32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) return autofs_compat_get_set_timeout(sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) case AUTOFS_IOC_ASKUMOUNT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) return autofs_ask_umount(filp->f_path.mnt, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) /* return a single thing to expire */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) case AUTOFS_IOC_EXPIRE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) return autofs_expire_run(inode->i_sb, filp->f_path.mnt, sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) /* same as above, but can send multiple expires through pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) case AUTOFS_IOC_EXPIRE_MULTI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) return autofs_expire_multi(inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) filp->f_path.mnt, sbi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) static long autofs_root_ioctl(struct file *filp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) return autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) static long autofs_root_compat_ioctl(struct file *filp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) ret = autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) ret = autofs_root_ioctl_unlocked(inode, filp, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) (unsigned long) compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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