summaryrefslogtreecommitdiffstats
path: root/fs/autofs/root.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/autofs/root.c')
-rw-r--r--fs/autofs/root.c643
1 files changed, 0 insertions, 643 deletions
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
deleted file mode 100644
index 11b1ea786d00..000000000000
--- a/fs/autofs/root.c
+++ /dev/null
@@ -1,643 +0,0 @@
-/* -*- linux-c -*- --------------------------------------------------------- *
- *
- * linux/fs/autofs/root.c
- *
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- *
- * ------------------------------------------------------------------------- */
-
-#include <linux/capability.h>
-#include <linux/errno.h>
-#include <linux/stat.h>
-#include <linux/slab.h>
-#include <linux/param.h>
-#include <linux/time.h>
-#include <linux/compat.h>
-#include <linux/smp_lock.h>
-#include "autofs_i.h"
-
-static int autofs_root_readdir(struct file *,void *,filldir_t);
-static struct dentry *autofs_root_lookup(struct inode *,struct dentry *, struct nameidata *);
-static int autofs_root_symlink(struct inode *,struct dentry *,const char *);
-static int autofs_root_unlink(struct inode *,struct dentry *);
-static int autofs_root_rmdir(struct inode *,struct dentry *);
-static int autofs_root_mkdir(struct inode *,struct dentry *,int);
-static long autofs_root_ioctl(struct file *,unsigned int,unsigned long);
-static long autofs_root_compat_ioctl(struct file *,unsigned int,unsigned long);
-
-const struct file_operations autofs_root_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = autofs_root_readdir,
- .unlocked_ioctl = autofs_root_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = autofs_root_compat_ioctl,
-#endif
-};
-
-const struct inode_operations autofs_root_inode_operations = {
- .lookup = autofs_root_lookup,
- .unlink = autofs_root_unlink,
- .symlink = autofs_root_symlink,
- .mkdir = autofs_root_mkdir,
- .rmdir = autofs_root_rmdir,
-};
-
-static int autofs_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct autofs_dir_ent *ent = NULL;
- struct autofs_dirhash *dirhash;
- struct autofs_sb_info *sbi;
- struct inode * inode = filp->f_path.dentry->d_inode;
- off_t onr, nr;
-
- lock_kernel();
-
- sbi = autofs_sbi(inode->i_sb);
- dirhash = &sbi->dirhash;
- nr = filp->f_pos;
-
- switch(nr)
- {
- case 0:
- if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0)
- goto out;
- filp->f_pos = ++nr;
- /* fall through */
- case 1:
- if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0)
- goto out;
- filp->f_pos = ++nr;
- /* fall through */
- default:
- while (onr = nr, ent = autofs_hash_enum(dirhash,&nr,ent)) {
- if (!ent->dentry || d_mountpoint(ent->dentry)) {
- if (filldir(dirent,ent->name,ent->len,onr,ent->ino,DT_UNKNOWN) < 0)
- goto out;
- filp->f_pos = nr;
- }
- }
- break;
- }
-
-out:
- unlock_kernel();
- return 0;
-}
-
-static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, struct autofs_sb_info *sbi)
-{
- struct inode * inode;
- struct autofs_dir_ent *ent;
- int status = 0;
-
- if (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))) {
- do {
- if (status && dentry->d_inode) {
- if (status != -ENOENT)
- printk("autofs warning: lookup failure on positive dentry, status = %d, name = %s\n", status, dentry->d_name.name);
- return 0; /* Try to get the kernel to invalidate this dentry */
- }
-
- /* Turn this into a real negative dentry? */
- if (status == -ENOENT) {
- dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- return 1;
- } else if (status) {
- /* Return a negative dentry, but leave it "pending" */
- return 1;
- }
- status = autofs_wait(sbi, &dentry->d_name);
- } while (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name)));
- }
-
- /* Abuse this field as a pointer to the directory entry, used to
- find the expire list pointers */
- dentry->d_time = (unsigned long) ent;
-
- if (!dentry->d_inode) {
- inode = autofs_iget(sb, ent->ino);
- if (IS_ERR(inode)) {
- /* Failed, but leave pending for next time */
- return 1;
- }
- dentry->d_inode = inode;
- }
-
- /* If this is a directory that isn't a mount point, bitch at the
- daemon and fix it in user space */
- if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
- return !autofs_wait(sbi, &dentry->d_name);
- }
-
- /* We don't update the usages for the autofs daemon itself, this
- is necessary for recursive autofs mounts */
- if (!autofs_oz_mode(sbi)) {
- autofs_update_usage(&sbi->dirhash,ent);
- }
-
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- return 1;
-}
-
-
-/*
- * Revalidate is called on every cache lookup. Some of those
- * cache lookups may actually happen while the dentry is not
- * yet completely filled in, and revalidate has to delay such
- * lookups..
- */
-static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd)
-{
- struct inode * dir;
- struct autofs_sb_info *sbi;
- struct autofs_dir_ent *ent;
- int res;
-
- lock_kernel();
- dir = dentry->d_parent->d_inode;
- sbi = autofs_sbi(dir->i_sb);
-
- /* Pending dentry */
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
- if (autofs_oz_mode(sbi))
- res = 1;
- else
- res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
- unlock_kernel();
- return res;
- }
-
- /* Negative dentry.. invalidate if "old" */
- if (!dentry->d_inode) {
- unlock_kernel();
- return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
- }
-
- /* Check for a non-mountpoint directory */
- if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
- if (autofs_oz_mode(sbi))
- res = 1;
- else
- res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
- unlock_kernel();
- return res;
- }
-
- /* Update the usage list */
- if (!autofs_oz_mode(sbi)) {
- ent = (struct autofs_dir_ent *) dentry->d_time;
- if (ent)
- autofs_update_usage(&sbi->dirhash,ent);
- }
- unlock_kernel();
- return 1;
-}
-
-static const struct dentry_operations autofs_dentry_operations = {
- .d_revalidate = autofs_revalidate,
-};
-
-static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
-{
- struct autofs_sb_info *sbi;
- int oz_mode;
-
- DPRINTK(("autofs_root_lookup: name = "));
- lock_kernel();
- autofs_say(dentry->d_name.name,dentry->d_name.len);
-
- if (dentry->d_name.len > NAME_MAX) {
- unlock_kernel();
- return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */
- }
-
- sbi = autofs_sbi(dir->i_sb);
-
- oz_mode = autofs_oz_mode(sbi);
- DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
- "oz_mode = %d\n", task_pid_nr(current),
- task_pgrp_nr(current), sbi->catatonic,
- oz_mode));
-
- /*
- * Mark the dentry incomplete, but add it. This is needed so
- * that the VFS layer knows about the dentry, and we can count
- * on catching any lookups through the revalidate.
- *
- * Let all the hard work be done by the revalidate function that
- * needs to be able to do this anyway..
- *
- * We need to do this before we release the directory semaphore.
- */
- dentry->d_op = &autofs_dentry_operations;
- dentry->d_flags |= DCACHE_AUTOFS_PENDING;
- d_add(dentry, NULL);
-
- mutex_unlock(&dir->i_mutex);
- autofs_revalidate(dentry, nd);
- mutex_lock(&dir->i_mutex);
-
- /*
- * If we are still pending, check if we had to handle
- * a signal. If so we can force a restart..
- */
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
- /* See if we were interrupted */
- if (signal_pending(current)) {
- sigset_t *sigset = &current->pending.signal;
- if (sigismember (sigset, SIGKILL) ||
- sigismember (sigset, SIGQUIT) ||
- sigismember (sigset, SIGINT)) {
- unlock_kernel();
- return ERR_PTR(-ERESTARTNOINTR);
- }
- }
- }
- unlock_kernel();
-
- /*
- * If this dentry is unhashed, then we shouldn't honour this
- * lookup even if the dentry is positive. Returning ENOENT here
- * doesn't do the right thing for all system calls, but it should
- * be OK for the operations we permit from an autofs.
- */
- if (dentry->d_inode && d_unhashed(dentry))
- return ERR_PTR(-ENOENT);
-
- return NULL;
-}
-
-static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_dirhash *dh = &sbi->dirhash;
- struct autofs_dir_ent *ent;
- unsigned int n;
- int slsize;
- struct autofs_symlink *sl;
- struct inode *inode;
-
- DPRINTK(("autofs_root_symlink: %s <- ", symname));
- autofs_say(dentry->d_name.name,dentry->d_name.len);
-
- lock_kernel();
- if (!autofs_oz_mode(sbi)) {
- unlock_kernel();
- return -EACCES;
- }
-
- if (autofs_hash_lookup(dh, &dentry->d_name)) {
- unlock_kernel();
- return -EEXIST;
- }
-
- n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS);
- if (n >= AUTOFS_MAX_SYMLINKS) {
- unlock_kernel();
- return -ENOSPC;
- }
-
- set_bit(n,sbi->symlink_bitmap);
- sl = &sbi->symlink[n];
- sl->len = strlen(symname);
- sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL);
- if (!sl->data) {
- clear_bit(n,sbi->symlink_bitmap);
- unlock_kernel();
- return -ENOSPC;
- }
-
- ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
- if (!ent) {
- kfree(sl->data);
- clear_bit(n,sbi->symlink_bitmap);
- unlock_kernel();
- return -ENOSPC;
- }
-
- ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
- if (!ent->name) {
- kfree(sl->data);
- kfree(ent);
- clear_bit(n,sbi->symlink_bitmap);
- unlock_kernel();
- return -ENOSPC;
- }
-
- memcpy(sl->data,symname,slsize);
- sl->mtime = get_seconds();
-
- ent->ino = AUTOFS_FIRST_SYMLINK + n;
- ent->hash = dentry->d_name.hash;
- memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
- ent->dentry = NULL; /* We don't keep the dentry for symlinks */
-
- autofs_hash_insert(dh,ent);
-
- inode = autofs_iget(dir->i_sb, ent->ino);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
-
- d_instantiate(dentry, inode);
- unlock_kernel();
- return 0;
-}
-
-/*
- * NOTE!
- *
- * Normal filesystems would do a "d_delete()" to tell the VFS dcache
- * that the file no longer exists. However, doing that means that the
- * VFS layer can turn the dentry into a negative dentry, which we
- * obviously do not want (we're dropping the entry not because it
- * doesn't exist, but because it has timed out).
- *
- * Also see autofs_root_rmdir()..
- */
-static int autofs_root_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_dirhash *dh = &sbi->dirhash;
- struct autofs_dir_ent *ent;
- unsigned int n;
-
- /* This allows root to remove symlinks */
- lock_kernel();
- if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) {
- unlock_kernel();
- return -EACCES;
- }
-
- ent = autofs_hash_lookup(dh, &dentry->d_name);
- if (!ent) {
- unlock_kernel();
- return -ENOENT;
- }
-
- n = ent->ino - AUTOFS_FIRST_SYMLINK;
- if (n >= AUTOFS_MAX_SYMLINKS) {
- unlock_kernel();
- return -EISDIR; /* It's a directory, dummy */
- }
- if (!test_bit(n,sbi->symlink_bitmap)) {
- unlock_kernel();
- return -EINVAL; /* Nonexistent symlink? Shouldn't happen */
- }
-
- dentry->d_time = (unsigned long)(struct autofs_dirhash *)NULL;
- autofs_hash_delete(ent);
- clear_bit(n,sbi->symlink_bitmap);
- kfree(sbi->symlink[n].data);
- d_drop(dentry);
-
- unlock_kernel();
- return 0;
-}
-
-static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_dirhash *dh = &sbi->dirhash;
- struct autofs_dir_ent *ent;
-
- lock_kernel();
- if (!autofs_oz_mode(sbi)) {
- unlock_kernel();
- return -EACCES;
- }
-
- ent = autofs_hash_lookup(dh, &dentry->d_name);
- if (!ent) {
- unlock_kernel();
- return -ENOENT;
- }
-
- if ((unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO) {
- unlock_kernel();
- return -ENOTDIR; /* Not a directory */
- }
-
- if (ent->dentry != dentry) {
- printk("autofs_rmdir: odentry != dentry for entry %s\n", dentry->d_name.name);
- }
-
- dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL;
- autofs_hash_delete(ent);
- drop_nlink(dir);
- d_drop(dentry);
- unlock_kernel();
-
- return 0;
-}
-
-static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
- struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
- struct autofs_dirhash *dh = &sbi->dirhash;
- struct autofs_dir_ent *ent;
- struct inode *inode;
- ino_t ino;
-
- lock_kernel();
- if (!autofs_oz_mode(sbi)) {
- unlock_kernel();
- return -EACCES;
- }
-
- ent = autofs_hash_lookup(dh, &dentry->d_name);
- if (ent) {
- unlock_kernel();
- return -EEXIST;
- }
-
- if (sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO) {
- printk("autofs: Out of inode numbers -- what the heck did you do??\n");
- unlock_kernel();
- return -ENOSPC;
- }
- ino = sbi->next_dir_ino++;
-
- ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
- if (!ent) {
- unlock_kernel();
- return -ENOSPC;
- }
-
- ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
- if (!ent->name) {
- kfree(ent);
- unlock_kernel();
- return -ENOSPC;
- }
-
- ent->hash = dentry->d_name.hash;
- memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
- ent->ino = ino;
- ent->dentry = dentry;
- autofs_hash_insert(dh,ent);
-
- inc_nlink(dir);
-
- inode = autofs_iget(dir->i_sb, ino);
- if (IS_ERR(inode)) {
- drop_nlink(dir);
- return PTR_ERR(inode);
- }
-
- d_instantiate(dentry, inode);
- unlock_kernel();
-
- return 0;
-}
-
-/* Get/set timeout ioctl() operation */
-#ifdef CONFIG_COMPAT
-static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
- unsigned int __user *p)
-{
- unsigned long ntimeout;
-
- if (get_user(ntimeout, p) ||
- put_user(sbi->exp_timeout / HZ, p))
- return -EFAULT;
-
- if (ntimeout > UINT_MAX/HZ)
- sbi->exp_timeout = 0;
- else
- sbi->exp_timeout = ntimeout * HZ;
-
- return 0;
-}
-#endif
-
-static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
- unsigned long __user *p)
-{
- unsigned long ntimeout;
-
- if (get_user(ntimeout, p) ||
- put_user(sbi->exp_timeout / HZ, p))
- return -EFAULT;
-
- if (ntimeout > ULONG_MAX/HZ)
- sbi->exp_timeout = 0;
- else
- sbi->exp_timeout = ntimeout * HZ;
-
- return 0;
-}
-
-/* Return protocol version */
-static inline int autofs_get_protover(int __user *p)
-{
- return put_user(AUTOFS_PROTO_VERSION, p);
-}
-
-/* Perform an expiry operation */
-static inline int autofs_expire_run(struct super_block *sb,
- struct autofs_sb_info *sbi,
- struct vfsmount *mnt,
- struct autofs_packet_expire __user *pkt_p)
-{
- struct autofs_dir_ent *ent;
- struct autofs_packet_expire pkt;
-
- memset(&pkt,0,sizeof pkt);
-
- pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
- pkt.hdr.type = autofs_ptype_expire;
-
- if (!sbi->exp_timeout || !(ent = autofs_expire(sb,sbi,mnt)))
- return -EAGAIN;
-
- pkt.len = ent->len;
- memcpy(pkt.name, ent->name, pkt.len);
- pkt.name[pkt.len] = '\0';
-
- if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
- return -EFAULT;
-
- return 0;
-}
-
-/*
- * ioctl()'s on the root directory is the chief method for the daemon to
- * generate kernel reactions
- */
-static int autofs_do_root_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
- void __user *argp = (void __user *)arg;
-
- DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current)));
-
- if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
- _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
- return -ENOTTY;
-
- if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- switch(cmd) {
- case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
- return autofs_wait_release(sbi,(autofs_wqt_t)arg,0);
- case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
- return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
- case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
- autofs_catatonic_mode(sbi);
- return 0;
- case AUTOFS_IOC_PROTOVER: /* Get protocol version */
- return autofs_get_protover(argp);
-#ifdef CONFIG_COMPAT
- case AUTOFS_IOC_SETTIMEOUT32:
- return autofs_compat_get_set_timeout(sbi, argp);
-#endif
- case AUTOFS_IOC_SETTIMEOUT:
- return autofs_get_set_timeout(sbi, argp);
- case AUTOFS_IOC_EXPIRE:
- return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt,
- argp);
- default:
- return -ENOSYS;
- }
-
-}
-
-static long autofs_root_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- int ret;
-
- lock_kernel();
- ret = autofs_do_root_ioctl(filp->f_path.dentry->d_inode,
- filp, cmd, arg);
- unlock_kernel();
-
- return ret;
-}
-
-#ifdef CONFIG_COMPAT
-static long autofs_root_compat_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
- int ret;
-
- lock_kernel();
- if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
- ret = autofs_do_root_ioctl(inode, filp, cmd, arg);
- else
- ret = autofs_do_root_ioctl(inode, filp, cmd,
- (unsigned long)compat_ptr(arg));
- unlock_kernel();
-
- return ret;
-}
-#endif