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staging: Remove autofs3

Browse Source 
autofs3 was moved to staging in 2.6.37, so we can
remove it in the 2.6.39 merge window. If we have
a reason to bring it back after that, this patch
can get reverted.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
About-fscking-timed-by: H. Peter Anvin <hpa@zytor.com>
Cc: Ian Kent <raven@themaw.net>
Cc: autofs@linux.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arnd Bergmann 2011-01-25 23:17:20 +01:00 committed by Greg Kroah-Hartman
parent 8aea5882c5
commit 561c5cf923
13 changed files with 0 additions and 1690 deletions
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6
MAINTAINERS
View File

@ -3559,12 +3559,6 @@ W: http://lse.sourceforge.net/kdump/
S: Maintained
F: Documentation/kdump/
KERNEL AUTOMOUNTER (AUTOFS)
M: "H. Peter Anvin" <hpa@zytor.com>
L: autofs@linux.kernel.org
S: Obsolete
F: drivers/staging/autofs/
KERNEL AUTOMOUNTER v4 (AUTOFS4)
M: Ian Kent <raven@themaw.net>
L: autofs@linux.kernel.org

2
drivers/staging/Kconfig
View File

@ -93,8 +93,6 @@ source "drivers/staging/frontier/Kconfig"
source "drivers/staging/pohmelfs/Kconfig"
source "drivers/staging/autofs/Kconfig"
source "drivers/staging/phison/Kconfig"
source "drivers/staging/line6/Kconfig"

1
drivers/staging/Makefile
View File

@ -31,7 +31,6 @@ obj-$(CONFIG_RTS_PSTOR) += rts_pstor/
obj-$(CONFIG_SPECTRA) += spectra/
obj-$(CONFIG_TRANZPORT) += frontier/
obj-$(CONFIG_POHMELFS) += pohmelfs/
obj-$(CONFIG_AUTOFS_FS) += autofs/
obj-$(CONFIG_IDE_PHISON) += phison/
obj-$(CONFIG_LINE6_USB) += line6/
obj-$(CONFIG_USB_SERIAL_QUATECH2) += serqt_usb2/

22
drivers/staging/autofs/Kconfig
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@ -1,22 +0,0 @@
config AUTOFS_FS
tristate "Kernel automounter support"
depends on BKL # unfixable, just use autofs4
help
The automounter is a tool to automatically mount remote file systems
on demand. This implementation is partially kernel-based to reduce
overhead in the already-mounted case; this is unlike the BSD
automounter (amd), which is a pure user space daemon.
To use the automounter you need the user-space tools from the autofs
package; you can find the location in <file:Documentation/Changes>.
You also want to answer Y to "NFS file system support", below.
If you want to use the newer version of the automounter with more
features, say N here and say Y to "Kernel automounter v4 support",
below.
To compile this support as a module, choose M here: the module will be
called autofs.
If you are not a part of a fairly large, distributed network, you
probably do not need an automounter, and can say N here.

7
drivers/staging/autofs/Makefile
View File

@ -1,7 +0,0 @@
#
# Makefile for the linux autofs-filesystem routines.
#
obj-$(CONFIG_AUTOFS_FS) += autofs.o
autofs-y := dirhash.o init.o inode.o root.o symlink.o waitq.o

8
drivers/staging/autofs/TODO
View File

@ -1,8 +0,0 @@
autofs version 3 is on its way out of the kernel,
It has been replaced by autofs4 several years ago.
The autofs3 code uses the big kernel lock which
is getting deprecated.
Users that find autofs3 to work but not autofs4
should talk to Ian Kent <raven@themaw.net>.

165
drivers/staging/autofs/autofs_i.h
View File

@ -1,165 +0,0 @@
/* -*- linux-c -*- ------------------------------------------------------- *
*
* drivers/staging/autofs/autofs_i.h
*
* 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.
*
* ----------------------------------------------------------------------- */
/* Internal header file for autofs */
#include <linux/auto_fs.h>
/* This is the range of ioctl() numbers we claim as ours */
#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
#define AUTOFS_IOC_COUNT 32
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/sched.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#ifdef DEBUG
#define DPRINTK(D) (printk D)
#else
#define DPRINTK(D) ((void)0)
#endif
/*
* If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
* kernel will keep the negative response cached for up to the time given
* here, although the time can be shorter if the kernel throws the dcache
* entry away. This probably should be settable from user space.
*/
#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
/* Structures associated with the root directory hash table */
#define AUTOFS_HASH_SIZE 67
struct autofs_dir_ent {
int hash;
char *name;
int len;
ino_t ino;
struct dentry *dentry;
/* Linked list of entries */
struct autofs_dir_ent *next;
struct autofs_dir_ent **back;
/* The following entries are for the expiry system */
unsigned long last_usage;
struct list_head exp;
};
struct autofs_dirhash {
struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
struct list_head expiry_head;
};
struct autofs_wait_queue {
wait_queue_head_t queue;
struct autofs_wait_queue *next;
autofs_wqt_t wait_queue_token;
/* We use the following to see what we are waiting for */
int hash;
int len;
char *name;
/* This is for status reporting upon return */
int status;
int wait_ctr;
};
struct autofs_symlink {
char *data;
int len;
time_t mtime;
};
#define AUTOFS_MAX_SYMLINKS 256
#define AUTOFS_ROOT_INO 1
#define AUTOFS_FIRST_SYMLINK 2
#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS)
#define AUTOFS_SYMLINK_BITMAP_LEN \
((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8))
#define AUTOFS_SBI_MAGIC 0x6d4a556d
struct autofs_sb_info {
u32 magic;
struct file *pipe;
struct pid *oz_pgrp;
int catatonic;
struct super_block *sb;
unsigned long exp_timeout;
ino_t next_dir_ino;
struct autofs_wait_queue *queues; /* Wait queue pointer */
struct autofs_dirhash dirhash; /* Root directory hash */
struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS];
unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
};
static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
{
return (struct autofs_sb_info *)(sb->s_fs_info);
}
/* autofs_oz_mode(): do we see the man behind the curtain? (The
processes which do manipulations for us in user space sees the raw
filesystem without "magic".) */
static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
}
/* Hash operations */
void autofs_initialize_hash(struct autofs_dirhash *);
struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *);
void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *);
void autofs_hash_delete(struct autofs_dir_ent *);
struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *);
void autofs_hash_dputall(struct autofs_dirhash *);
void autofs_hash_nuke(struct autofs_sb_info *);
/* Expiration-handling functions */
void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *);
struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt);
/* Operations structures */
extern const struct inode_operations autofs_root_inode_operations;
extern const struct inode_operations autofs_symlink_inode_operations;
extern const struct file_operations autofs_root_operations;
/* Initializing function */
int autofs_fill_super(struct super_block *, void *, int);
void autofs_kill_sb(struct super_block *sb);
struct inode *autofs_iget(struct super_block *, unsigned long);
/* Queue management functions */
int autofs_wait(struct autofs_sb_info *,struct qstr *);
int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
void autofs_catatonic_mode(struct autofs_sb_info *);
#ifdef DEBUG
void autofs_say(const char *name, int len);
#else
#define autofs_say(n,l) ((void)0)
#endif

260
drivers/staging/autofs/dirhash.c
View File

@ -1,260 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/autofs/dirhash.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 "autofs_i.h"
/* Functions for maintenance of expiry queue */
static void autofs_init_usage(struct autofs_dirhash *dh,
struct autofs_dir_ent *ent)
{
list_add_tail(&ent->exp, &dh->expiry_head);
ent->last_usage = jiffies;
}
static void autofs_delete_usage(struct autofs_dir_ent *ent)
{
list_del(&ent->exp);
}
void autofs_update_usage(struct autofs_dirhash *dh,
struct autofs_dir_ent *ent)
{
autofs_delete_usage(ent); /* Unlink from current position */
autofs_init_usage(dh, ent); /* Relink at queue tail */
}
struct autofs_dir_ent *autofs_expire(struct super_block *sb,
struct autofs_sb_info *sbi,
struct vfsmount *mnt)
{
struct autofs_dirhash *dh = &sbi->dirhash;
struct autofs_dir_ent *ent;
unsigned long timeout = sbi->exp_timeout;
while (1) {
struct path path;
int umount_ok;
if (list_empty(&dh->expiry_head) || sbi->catatonic)
return NULL; /* No entries */
/* We keep the list sorted by last_usage and want old stuff */
ent = list_entry(dh->expiry_head.next,
struct autofs_dir_ent, exp);
if (jiffies - ent->last_usage < timeout)
break;
/* Move to end of list in case expiry isn't desirable */
autofs_update_usage(dh, ent);
/* Check to see that entry is expirable */
if (ent->ino < AUTOFS_FIRST_DIR_INO)
return ent; /* Symlinks are always expirable */
/* Get the dentry for the autofs subdirectory */
path.dentry = ent->dentry;
if (!path.dentry) {
/* Should only happen in catatonic mode */
printk(KERN_DEBUG "autofs: dentry == NULL but inode \
range is directory, entry %s\n", ent->name);
autofs_delete_usage(ent);
continue;
}
if (!path.dentry->d_inode) {
dput(path.dentry);
printk(KERN_DEBUG "autofs: negative dentry on expiry queue: %s\n",
ent->name);
autofs_delete_usage(ent);
continue;
}
/* Make sure entry is mounted and unused; note that dentry will
point to the mounted-on-top root. */
if (!S_ISDIR(path.dentry->d_inode->i_mode) ||
!d_mountpoint(path.dentry)) {
DPRINTK(("autofs: not expirable \
(not a mounted directory): %s\n", ent->name));
continue;
}
path.mnt = mnt;
path_get(&path);
if (!follow_down_one(&path)) {
path_put(&path);
DPRINTK(("autofs: not expirable\
(not a mounted directory): %s\n", ent->name));
continue;
}
follow_down(&path, false); // TODO: need to check error
umount_ok = may_umount(path.mnt);
path_put(&path);
if (umount_ok) {
DPRINTK(("autofs: signaling expire on %s\n",
ent->name));
return ent; /* Expirable! */
}
DPRINTK(("autofs: didn't expire due to may_umount: %s\n",
ent->name));
}
return NULL; /* No expirable entries */
}
void autofs_initialize_hash(struct autofs_dirhash *dh)
{
memset(&dh->h, 0, AUTOFS_HASH_SIZE*sizeof(struct autofs_dir_ent *));
INIT_LIST_HEAD(&dh->expiry_head);
}
struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *dh,
struct qstr *name)
{
struct autofs_dir_ent *dhn;
DPRINTK(("autofs_hash_lookup: hash = 0x%08x, name = ", name->hash));
autofs_say(name->name, name->len);
for (dhn = dh->h[(unsigned) name->hash % AUTOFS_HASH_SIZE];
dhn;
dhn = dhn->next) {
if (name->hash == dhn->hash &&
name->len == dhn->len &&
!memcmp(name->name, dhn->name, name->len))
break;
}
return dhn;
}
void autofs_hash_insert(struct autofs_dirhash *dh, struct autofs_dir_ent *ent)
{
struct autofs_dir_ent **dhnp;
DPRINTK(("autofs_hash_insert: hash = 0x%08x, name = ", ent->hash));
autofs_say(ent->name, ent->len);
autofs_init_usage(dh, ent);
if (ent->dentry)
dget(ent->dentry);
dhnp = &dh->h[(unsigned) ent->hash % AUTOFS_HASH_SIZE];
ent->next = *dhnp;
ent->back = dhnp;
*dhnp = ent;
if (ent->next)
ent->next->back = &(ent->next);
}
void autofs_hash_delete(struct autofs_dir_ent *ent)
{
*(ent->back) = ent->next;
if (ent->next)
ent->next->back = ent->back;
autofs_delete_usage(ent);
if (ent->dentry)
dput(ent->dentry);
kfree(ent->name);
kfree(ent);
}
/*
* Used by readdir(). We must validate "ptr", so we can't simply make it
* a pointer. Values below 0xffff are reserved; calling with any value
* <= 0x10000 will return the first entry found.
*
* "last" can be NULL or the value returned by the last search *if* we
* want the next sequential entry.
*/
struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *dh,
off_t *ptr, struct autofs_dir_ent *last)
{
int bucket, ecount, i;
struct autofs_dir_ent *ent;
bucket = (*ptr >> 16) - 1;
ecount = *ptr & 0xffff;
if (bucket < 0)
bucket = ecount = 0;
DPRINTK(("autofs_hash_enum: bucket %d, entry %d\n", bucket, ecount));
ent = last ? last->next : NULL;
if (ent) {
ecount++;
} else {
while (bucket < AUTOFS_HASH_SIZE) {
ent = dh->h[bucket];
for (i = ecount ; ent && i ; i--)
ent = ent->next;
if (ent) {
ecount++; /* Point to *next* entry */
break;
}
bucket++; ecount = 0;
}
}
#ifdef DEBUG
if (!ent)
printk(KERN_DEBUG "autofs_hash_enum: nothing found\n");
else {
printk(KERN_DEBUG "autofs_hash_enum: found hash %08x, name",
ent->hash);
autofs_say(ent->name, ent->len);
}
#endif
*ptr = ((bucket+1) << 16) + ecount;
return ent;
}
/* Iterate over all the ents, and remove all dentry pointers. Used on
entering catatonic mode, in order to make the filesystem unmountable. */
void autofs_hash_dputall(struct autofs_dirhash *dh)
{
int i;
struct autofs_dir_ent *ent;
for (i = 0 ; i < AUTOFS_HASH_SIZE ; i++) {
for (ent = dh->h[i] ; ent ; ent = ent->next) {
if (ent->dentry) {
dput(ent->dentry);
ent->dentry = NULL;
}
}
}
}
/* Delete everything. This is used on filesystem destruction, so we
make no attempt to keep the pointers valid */
void autofs_hash_nuke(struct autofs_sb_info *sbi)
{
int i;
struct autofs_dir_ent *ent, *nent;
for (i = 0 ; i < AUTOFS_HASH_SIZE ; i++) {
for (ent = sbi->dirhash.h[i] ; ent ; ent = nent) {
nent = ent->next;
if (ent->dentry)
dput(ent->dentry);
kfree(ent->name);
kfree(ent);
}
}
}

52
drivers/staging/autofs/init.c
View File

@ -1,52 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/autofs/init.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/module.h>
#include <linux/init.h>
#include "autofs_i.h"
static struct dentry *autofs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_nodev(fs_type, flags, data, autofs_fill_super);
}
static struct file_system_type autofs_fs_type = {
.owner = THIS_MODULE,
.name = "autofs",
.mount = autofs_mount,
.kill_sb = autofs_kill_sb,
};
static int __init init_autofs_fs(void)
{
return register_filesystem(&autofs_fs_type);
}
static void __exit exit_autofs_fs(void)
{
unregister_filesystem(&autofs_fs_type);
}
module_init(init_autofs_fs);
module_exit(exit_autofs_fs);
#ifdef DEBUG
void autofs_say(const char *name, int len)
{
printk("(%d: ", len);
while ( len-- )
printk("%c", *name++);
printk(")\n");
}
#endif
MODULE_LICENSE("GPL");

288
drivers/staging/autofs/inode.c
View File

@ -1,288 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/autofs/inode.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/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/bitops.h>
#include <linux/magic.h>
#include "autofs_i.h"
#include <linux/module.h>
void autofs_kill_sb(struct super_block *sb)
{
struct autofs_sb_info *sbi = autofs_sbi(sb);
unsigned int n;
/*
* In the event of a failure in get_sb_nodev the superblock
* info is not present so nothing else has been setup, so
* just call kill_anon_super when we are called from
* deactivate_super.
*/
if (!sbi)
goto out_kill_sb;
if (!sbi->catatonic)
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
put_pid(sbi->oz_pgrp);
autofs_hash_nuke(sbi);
for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) {
if (test_bit(n, sbi->symlink_bitmap))
kfree(sbi->symlink[n].data);
}
kfree(sb->s_fs_info);
out_kill_sb:
DPRINTK(("autofs: shutting down\n"));
kill_anon_super(sb);
}
static const struct super_operations autofs_sops = {
.statfs = simple_statfs,
.show_options = generic_show_options,
};
enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
static const match_table_t autofs_tokens = {
{Opt_fd, "fd=%u"},
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_pgrp, "pgrp=%u"},
{Opt_minproto, "minproto=%u"},
{Opt_maxproto, "maxproto=%u"},
{Opt_err, NULL}
};
static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
pid_t *pgrp, int *minproto, int *maxproto)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
*uid = current_uid();
*gid = current_gid();
*pgrp = task_pgrp_nr(current);
*minproto = *maxproto = AUTOFS_PROTO_VERSION;
*pipefd = -1;
if (!options)
return 1;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, autofs_tokens, args);
switch (token) {
case Opt_fd:
if (match_int(&args[0], &option))
return 1;
*pipefd = option;
break;
case Opt_uid:
if (match_int(&args[0], &option))
return 1;
*uid = option;
break;
case Opt_gid:
if (match_int(&args[0], &option))
return 1;
*gid = option;
break;
case Opt_pgrp:
if (match_int(&args[0], &option))
return 1;
*pgrp = option;
break;
case Opt_minproto:
if (match_int(&args[0], &option))
return 1;
*minproto = option;
break;
case Opt_maxproto:
if (match_int(&args[0], &option))
return 1;
*maxproto = option;
break;
default:
return 1;
}
}
return (*pipefd < 0);
}
int autofs_fill_super(struct super_block *s, void *data, int silent)
{
struct inode * root_inode;
struct dentry * root;
struct file * pipe;
int pipefd;
struct autofs_sb_info *sbi;
int minproto, maxproto;
pid_t pgid;
save_mount_options(s, data);
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
goto fail_unlock;
DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
s->s_fs_info = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
sbi->pipe = NULL;
sbi->catatonic = 1;
sbi->exp_timeout = 0;
autofs_initialize_hash(&sbi->dirhash);
sbi->queues = NULL;
memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = AUTOFS_SUPER_MAGIC;
s->s_op = &autofs_sops;
s->s_time_gran = 1;
sbi->sb = s;
root_inode = autofs_iget(s, AUTOFS_ROOT_INO);
if (IS_ERR(root_inode))
goto fail_free;
root = d_alloc_root(root_inode);
pipe = NULL;
if (!root)
goto fail_iput;
/* Can this call block? - WTF cares? s is locked. */
if (parse_options(data, &pipefd, &root_inode->i_uid,
&root_inode->i_gid, &pgid, &minproto,
&maxproto)) {
printk("autofs: called with bogus options\n");
goto fail_dput;
}
/* Couldn't this be tested earlier? */
if (minproto > AUTOFS_PROTO_VERSION ||
maxproto < AUTOFS_PROTO_VERSION) {
printk("autofs: kernel does not match daemon version\n");
goto fail_dput;
}
DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, pgid));
sbi->oz_pgrp = find_get_pid(pgid);
if (!sbi->oz_pgrp) {
printk("autofs: could not find process group %d\n", pgid);
goto fail_dput;
}
pipe = fget(pipefd);
if (!pipe) {
printk("autofs: could not open pipe file descriptor\n");
goto fail_put_pid;
}
if (!pipe->f_op || !pipe->f_op->write)
goto fail_fput;
sbi->pipe = pipe;
sbi->catatonic = 0;
/*
* Success! Install the root dentry now to indicate completion.
*/
s->s_root = root;
return 0;
fail_fput:
printk("autofs: pipe file descriptor does not contain proper ops\n");
fput(pipe);
fail_put_pid:
put_pid(sbi->oz_pgrp);
fail_dput:
dput(root);
goto fail_free;
fail_iput:
printk("autofs: get root dentry failed\n");
iput(root_inode);
fail_free:
kfree(sbi);
s->s_fs_info = NULL;
fail_unlock:
return -EINVAL;
}
struct inode *autofs_iget(struct super_block *sb, unsigned long ino)
{
unsigned int n;
struct autofs_sb_info *sbi = autofs_sbi(sb);
struct inode *inode;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
/* Initialize to the default case (stub directory) */
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
inode->i_nlink = 2;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
if (ino == AUTOFS_ROOT_INO) {
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
inode->i_op = &autofs_root_inode_operations;
inode->i_fop = &autofs_root_operations;
goto done;
}
inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
if (ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO) {
/* Symlink inode - should be in symlink list */
struct autofs_symlink *sl;
n = ino - AUTOFS_FIRST_SYMLINK;
if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
goto done;
}
inode->i_op = &autofs_symlink_inode_operations;
sl = &sbi->symlink[n];
inode->i_private = sl;
inode->i_mode = S_IFLNK | S_IRWXUGO;
inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
inode->i_size = sl->len;
inode->i_nlink = 1;
}
done:
unlock_new_inode(inode);
return inode;
}

648
drivers/staging/autofs/root.c
View File

@ -1,648 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/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);
#ifdef CONFIG_COMPAT
static long autofs_root_compat_ioctl(struct file *,unsigned int,unsigned long);
#endif
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;
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
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.
*/
d_set_d_op(dentry, &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

26
drivers/staging/autofs/symlink.c
View File

@ -1,26 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/autofs/symlink.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 "autofs_i.h"
/* Nothing to release.. */
static void *autofs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *s=((struct autofs_symlink *)dentry->d_inode->i_private)->data;
nd_set_link(nd, s);
return NULL;
}
const struct inode_operations autofs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = autofs_follow_link
};

205
drivers/staging/autofs/waitq.c
View File

@ -1,205 +0,0 @@
/* -*- linux-c -*- --------------------------------------------------------- *
*
* drivers/staging/autofs/waitq.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/slab.h>
#include <linux/time.h>
#include <linux/signal.h>
#include <linux/file.h>
#include "autofs_i.h"
/* We make this a static variable rather than a part of the superblock; it
is better if we don't reassign numbers easily even across filesystems */
static autofs_wqt_t autofs_next_wait_queue = 1;
/* These are the signals we allow interrupting a pending mount */
#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT))
void autofs_catatonic_mode(struct autofs_sb_info *sbi)
{
struct autofs_wait_queue *wq, *nwq;
DPRINTK(("autofs: entering catatonic mode\n"));
sbi->catatonic = 1;
wq = sbi->queues;
sbi->queues = NULL; /* Erase all wait queues */
while ( wq ) {
nwq = wq->next;
wq->status = -ENOENT; /* Magic is gone - report failure */
kfree(wq->name);
wq->name = NULL;
wake_up(&wq->queue);
wq = nwq;
}
fput(sbi->pipe); /* Close the pipe */
sbi->pipe = NULL;
autofs_hash_dputall(&sbi->dirhash); /* Remove all dentry pointers */
}
static int autofs_write(struct file *file, const void *addr, int bytes)
{
unsigned long sigpipe, flags;
mm_segment_t fs;
const char *data = (const char *)addr;
ssize_t wr = 0;
/** WARNING: this is not safe for writing more than PIPE_BUF bytes! **/
sigpipe = sigismember(&current->pending.signal, SIGPIPE);
/* Save pointer to user space and point back to kernel space */
fs = get_fs();
set_fs(KERNEL_DS);
while (bytes &&
(wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) {
data += wr;
bytes -= wr;
}
set_fs(fs);
/* Keep the currently executing process from receiving a
SIGPIPE unless it was already supposed to get one */
if (wr == -EPIPE && !sigpipe) {
spin_lock_irqsave(&current->sighand->siglock, flags);
sigdelset(&current->pending.signal, SIGPIPE);
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
}
return (bytes > 0);
}
static void autofs_notify_daemon(struct autofs_sb_info *sbi, struct autofs_wait_queue *wq)
{
struct autofs_packet_missing pkt;
DPRINTK(("autofs_wait: wait id = 0x%08lx, name = ", wq->wait_queue_token));
autofs_say(wq->name,wq->len);
memset(&pkt,0,sizeof pkt); /* For security reasons */
pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
pkt.hdr.type = autofs_ptype_missing;
pkt.wait_queue_token = wq->wait_queue_token;
pkt.len = wq->len;
memcpy(pkt.name, wq->name, pkt.len);
pkt.name[pkt.len] = '\0';
if ( autofs_write(sbi->pipe,&pkt,sizeof(struct autofs_packet_missing)) )
autofs_catatonic_mode(sbi);
}
int autofs_wait(struct autofs_sb_info *sbi, struct qstr *name)
{
struct autofs_wait_queue *wq;
int status;
/* In catatonic mode, we don't wait for nobody */
if ( sbi->catatonic )
return -ENOENT;
/* We shouldn't be able to get here, but just in case */
if ( name->len > NAME_MAX )
return -ENOENT;
for ( wq = sbi->queues ; wq ; wq = wq->next ) {
if ( wq->hash == name->hash &&
wq->len == name->len &&
wq->name && !memcmp(wq->name,name->name,name->len) )
break;
}
if ( !wq ) {
/* Create a new wait queue */
wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
if ( !wq )
return -ENOMEM;
wq->name = kmalloc(name->len,GFP_KERNEL);
if ( !wq->name ) {
kfree(wq);
return -ENOMEM;
}
wq->wait_queue_token = autofs_next_wait_queue++;
init_waitqueue_head(&wq->queue);
wq->hash = name->hash;
wq->len = name->len;
wq->status = -EINTR; /* Status return if interrupted */
memcpy(wq->name, name->name, name->len);
wq->next = sbi->queues;
sbi->queues = wq;
/* autofs_notify_daemon() may block */
wq->wait_ctr = 2;
autofs_notify_daemon(sbi,wq);
} else
wq->wait_ctr++;
/* wq->name is NULL if and only if the lock is already released */
if ( sbi->catatonic ) {
/* We might have slept, so check again for catatonic mode */
wq->status = -ENOENT;
kfree(wq->name);
wq->name = NULL;
}
if ( wq->name ) {
/* Block all but "shutdown" signals while waiting */
sigset_t sigmask;
siginitsetinv(&sigmask, SHUTDOWN_SIGS);
sigprocmask(SIG_BLOCK, &sigmask, &sigmask);
interruptible_sleep_on(&wq->queue);
sigprocmask(SIG_SETMASK, &sigmask, NULL);
} else {
DPRINTK(("autofs_wait: skipped sleeping\n"));
}
status = wq->status;
if ( ! --wq->wait_ctr ) /* Are we the last process to need status? */
kfree(wq);
return status;
}
int autofs_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status)
{
struct autofs_wait_queue *wq, **wql;
for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
if ( wq->wait_queue_token == wait_queue_token )
break;
}
if ( !wq )
return -EINVAL;
*wql = wq->next; /* Unlink from chain */
kfree(wq->name);
wq->name = NULL; /* Do not wait on this queue */
wq->status = status;
if ( ! --wq->wait_ctr ) /* Is anyone still waiting for this guy? */
kfree(wq);
else
wake_up(&wq->queue);
return 0;
}