*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
* Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
+ * Copyright 2001-2003 Ian Kent <raven@themaw.net>
*
* 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
static int autofs4_dir_rmdir(struct inode *,struct dentry *);
static int autofs4_dir_mkdir(struct inode *,struct dentry *,int);
static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
+static int autofs4_dir_open(struct inode *inode, struct file *file);
+static int autofs4_dir_close(struct inode *inode, struct file *file);
+static int autofs4_dir_readdir(struct file * filp, void * dirent, filldir_t filldir);
static struct dentry *autofs4_root_lookup(struct inode *,struct dentry *, struct nameidata *);
struct file_operations autofs4_root_operations = {
.open = dcache_dir_open,
.release = dcache_dir_close,
- .llseek = dcache_dir_lseek,
.read = generic_read_dir,
.readdir = dcache_readdir,
.ioctl = autofs4_root_ioctl,
};
+struct file_operations autofs4_dir_operations = {
+ .open = autofs4_dir_open,
+ .release = autofs4_dir_close,
+ .read = generic_read_dir,
+ .readdir = autofs4_dir_readdir,
+};
+
struct inode_operations autofs4_root_inode_operations = {
.lookup = autofs4_root_lookup,
.unlink = autofs4_dir_unlink,
}
}
+static void autofs4_check_pwd(struct file *file, struct file *fp)
+{
+ struct dentry *pwd = file->f_dentry;
+ struct dentry *new_pwd = fp->f_dentry;
+ struct vfsmount *new_mnt = fp->f_vfsmnt;
+
+ /* dentry is a pwd of mountpoint so move to it */
+ if (current->fs->pwd == pwd)
+ set_fs_pwd(current->fs, new_mnt, new_pwd);
+
+ /* dentry is root of a chrooted mountpoint so move to it */
+ if (current->fs->root == pwd) {
+ set_fs_root(current->fs, new_mnt, new_pwd);
+ /* alternate os ABI not supported */
+ /* set_fs_altroot(); */
+ }
+}
+
+/*
+ * From 2.4 kernel readdir.c
+ */
+static int autofs4_dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+ int i;
+ struct dentry *dentry = filp->f_dentry;
+
+ i = filp->f_pos;
+ switch (i) {
+ case 0:
+ if (filldir(dirent, ".", 1, i, dentry->d_inode->i_ino, DT_DIR) < 0)
+ break;
+ i++;
+ filp->f_pos++;
+ /* fallthrough */
+ case 1:
+ if (filldir(dirent, "..", 2, i, dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
+ break;
+ i++;
+ filp->f_pos++;
+ /* fallthrough */
+ default: {
+ struct list_head *list;
+ int j = i-2;
+
+ spin_lock(&dcache_lock);
+ list = dentry->d_subdirs.next;
+
+ for (;;) {
+ if (list == &dentry->d_subdirs) {
+ spin_unlock(&dcache_lock);
+ return 0;
+ }
+ if (!j)
+ break;
+ j--;
+ list = list->next;
+ }
+
+ while(1) {
+ struct dentry *de = list_entry(list, struct dentry, d_child);
+
+ if (!d_unhashed(de) && de->d_inode) {
+ spin_unlock(&dcache_lock);
+ if (filldir(dirent, de->d_name.name, de->d_name.len, filp->f_pos, de->d_inode->i_ino, DT_UNKNOWN) < 0)
+ break;
+ spin_lock(&dcache_lock);
+ }
+ filp->f_pos++;
+ list = list->next;
+ if (list != &dentry->d_subdirs)
+ continue;
+ spin_unlock(&dcache_lock);
+ break;
+ }
+ }
+ }
+ return 0;
+}
+
+static int autofs4_dir_open(struct inode *inode, struct file *file)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct vfsmount *mnt = file->f_vfsmnt;
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ int status;
+
+ DPRINTK(("autofs4_dir_open: file=%p dentry=%p %.*s\n",
+ file, dentry, dentry->d_name.len, dentry->d_name.name));
+
+ if (autofs4_oz_mode(sbi))
+ goto out;
+
+ if (autofs4_ispending(dentry)) {
+ DPRINTK(("autofs4_dir_open: dentry busy\n"));
+ return -EBUSY;
+ }
+
+ if (!d_mountpoint(dentry) && dentry->d_op && dentry->d_op->d_revalidate) {
+ struct nameidata nd;
+ int empty;
+
+ /* In case there are stale directory dentrys from a failed mount */
+ spin_lock(&dcache_lock);
+ empty = list_empty(&dentry->d_subdirs);
+ spin_unlock(&dcache_lock);
+
+ if (!empty)
+ d_invalidate(dentry);
+
+ nd.flags = LOOKUP_CONTINUE;
+ status = (dentry->d_op->d_revalidate)(dentry, &nd);
+
+ if (!status)
+ return -ENOENT;
+ }
+
+ if (d_mountpoint(dentry)) {
+ struct file *fp = NULL;
+ struct vfsmount *fp_mnt = mntget(mnt);
+ struct dentry *fp_dentry = dget(dentry);
+
+ while (follow_down(&fp_mnt, &fp_dentry) && d_mountpoint(fp_dentry));
+
+ fp = dentry_open(fp_dentry, fp_mnt, file->f_flags);
+ status = PTR_ERR(fp);
+ if (IS_ERR(fp)) {
+ file->private_data = NULL;
+ return status;
+ }
+ autofs4_check_pwd(file, fp);
+ file->private_data = fp;
+ }
+out:
+ return 0;
+}
+
+static int autofs4_dir_close(struct inode *inode, struct file *file)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+
+ DPRINTK(("autofs4_dir_close: file=%p dentry=%p %.*s\n",
+ file, dentry, dentry->d_name.len, dentry->d_name.name));
+
+ if (autofs4_oz_mode(sbi))
+ goto out;
+
+ if (autofs4_ispending(dentry)) {
+ DPRINTK(("autofs4_dir_close: dentry busy\n"));
+ return -EBUSY;
+ }
+
+ if (d_mountpoint(dentry)) {
+ struct file *fp = file->private_data;
+
+ if (!fp)
+ return -ENOENT;
+
+ filp_close(fp, current->files);
+ file->private_data = NULL;
+ }
+out:
+ return 0;
+}
+
+static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ int status;
+
+ DPRINTK(("autofs4_readdir: file=%p dentry=%p %.*s\n",
+ file, dentry, dentry->d_name.len, dentry->d_name.name));
+
+ if (autofs4_oz_mode(sbi))
+ goto out;
+
+ if (autofs4_ispending(dentry)) {
+ DPRINTK(("autofs4_readdir: dentry busy\n"));
+ return -EBUSY;
+ }
+
+ if (d_mountpoint(dentry)) {
+ struct file *fp = file->private_data;
+
+ if (!fp)
+ return -ENOENT;
+
+ if (!fp->f_op || !fp->f_op->readdir)
+ goto out;
+
+ status = vfs_readdir(fp, filldir, dirent);
+ file->f_pos = fp->f_pos;
+ if (status)
+ autofs4_copy_atime(file, fp);
+ return status;
+ }
+out:
+ return autofs4_dcache_readdir(file, dirent, filldir);
+}
+
static int try_to_fill_dentry(struct dentry *dentry,
struct super_block *sb,
- struct autofs_sb_info *sbi)
+ struct autofs_sb_info *sbi, int flags)
{
struct autofs_info *de_info = autofs4_dentry_ino(dentry);
int status = 0;
DPRINTK(("try_to_fill_entry: waiting for expire %p name=%.*s\n",
dentry, dentry->d_name.len, dentry->d_name.name));
- status = autofs4_wait(sbi, &dentry->d_name, NFY_NONE);
+ status = autofs4_wait(sbi, dentry, NFY_NONE);
DPRINTK(("try_to_fill_entry: expire done status=%d\n", status));
dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode));
/* Wait for a pending mount, triggering one if there isn't one already */
- while(dentry->d_inode == NULL) {
- DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s, de_info=%p de_info->flags=%x\n",
- dentry->d_name.len, dentry->d_name.name,
- de_info, de_info?de_info->flags:0));
- status = autofs4_wait(sbi, &dentry->d_name, NFY_MOUNT);
+ if (dentry->d_inode == NULL) {
+ DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s\n",
+ dentry->d_name.len, dentry->d_name.name));
+
+ status = autofs4_wait(sbi, dentry, NFY_MOUNT);
DPRINTK(("try_to_fill_entry: mount done status=%d\n", status));
/* Return a negative dentry, but leave it "pending" */
return 1;
}
- }
+ /* Trigger mount for path component or follow link */
+ } else if (flags & LOOKUP_CONTINUE || current->link_count) {
+ DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s\n",
+ dentry->d_name.len, dentry->d_name.name));
- /* If this is an unused directory that isn't a mount point,
- bitch at the daemon and fix it in user space */
- spin_lock(&dcache_lock);
- if (S_ISDIR(dentry->d_inode->i_mode) &&
- !d_mountpoint(dentry) &&
- list_empty(&dentry->d_subdirs)) {
- DPRINTK(("try_to_fill_entry: mounting existing dir\n"));
- spin_unlock(&dcache_lock);
- return autofs4_wait(sbi, &dentry->d_name, NFY_MOUNT) == 0;
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_AUTOFS_PENDING;
+ spin_unlock(&dentry->d_lock);
+ status = autofs4_wait(sbi, dentry, NFY_MOUNT);
+
+ DPRINTK(("try_to_fill_entry: mount done status=%d\n", status));
+
+ if (status) {
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
+ spin_unlock(&dentry->d_lock);
+ return 0;
+ }
+ /* also for chdir or chroot so subsequent path walks work properly */
+ } else if (dentry == current->fs->pwd || dentry == current->fs->root) {
+ struct vfsmount *mnt;
+
+ DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s\n",
+ dentry->d_name.len, dentry->d_name.name));
+
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_AUTOFS_PENDING;
+ spin_unlock(&dentry->d_lock);
+ status = autofs4_wait(sbi, dentry, NFY_MOUNT);
+
+ DPRINTK(("try_to_fill_entry: mount done status=%d\n", status));
+
+ if ( status ) {
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
+ spin_unlock(&dentry->d_lock);
+ return 0;
+ }
+
+ if (dentry == current->fs->pwd) {
+ mnt = lookup_mnt(current->fs->pwdmnt, dentry);
+ set_fs_pwd(current->fs, mnt, mnt->mnt_root);
+ } else {
+ mnt = lookup_mnt(current->fs->rootmnt, dentry);
+ set_fs_root(current->fs, mnt, mnt->mnt_root);
+ }
+ mntput(mnt);
}
- spin_unlock(&dcache_lock);
/* We don't update the usages for the autofs daemon itself, this
is necessary for recursive autofs mounts */
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 autofs4_root_revalidate(struct dentry * dentry, struct nameidata *nd)
+static int autofs4_revalidate(struct dentry * dentry, struct nameidata *nd)
{
struct inode * dir = dentry->d_parent->d_inode;
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
int oz_mode = autofs4_oz_mode(sbi);
+ int flags = nd ? nd->flags : 0;
+ int status = 1;
/* Pending dentry */
if (autofs4_ispending(dentry)) {
- if (autofs4_oz_mode(sbi))
- return 1;
- else
- return try_to_fill_dentry(dentry, dir->i_sb, sbi);
+ if (!oz_mode)
+ status = try_to_fill_dentry(dentry, dir->i_sb, sbi, flags);
+ return status;
}
/* Negative dentry.. invalidate if "old" */
DPRINTK(("autofs4_root_revalidate: dentry=%p %.*s, emptydir\n",
dentry, dentry->d_name.len, dentry->d_name.name));
spin_unlock(&dcache_lock);
- if (oz_mode)
- return 1;
- else
- return try_to_fill_dentry(dentry, dir->i_sb, sbi);
+ if (!oz_mode)
+ status = try_to_fill_dentry(dentry, dir->i_sb, sbi, flags);
+ return status;
}
spin_unlock(&dcache_lock);
return 1;
}
-static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
-{
- struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-
- if (!autofs4_oz_mode(sbi))
- autofs4_update_usage(dentry);
-
- return 1;
-}
-
static void autofs4_dentry_release(struct dentry *de)
{
struct autofs_info *inf;
/* For dentries of directories in the root dir */
static struct dentry_operations autofs4_root_dentry_operations = {
- .d_revalidate = autofs4_root_revalidate,
+ .d_revalidate = autofs4_revalidate,
.d_release = autofs4_dentry_release,
};
/* Lookups in non-root dirs never find anything - if it's there, it's
already in the dcache */
-/* SMP-safe */
static struct dentry *autofs4_dir_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
#if 0
- DPRINTK(("autofs_dir_lookup: ignoring lookup of %.*s/%.*s\n",
+ DPRINTK(("autofs4_dir_lookup: iignoring lookup of %.*s/%.*s\n",
dentry->d_parent->d_name.len, dentry->d_parent->d_name.name,
dentry->d_name.len, dentry->d_name.name));
#endif
return 0;
}
-
-
static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
return put_user(sbi->version, p);
}
+/* Return protocol sub version */
+static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int *p)
+{
+ return put_user(sbi->sub_version, p);
+}
+
/* Identify autofs4_dentries - this is so we can tell if there's
an extra dentry refcount or not. We only hold a refcount on the
dentry if its non-negative (ie, d_inode != NULL)
return 0;
case AUTOFS_IOC_PROTOVER: /* Get protocol version */
return autofs4_get_protover(sbi, (int *)arg);
+ case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
+ return autofs4_get_protosubver(sbi, (int *)arg);
case AUTOFS_IOC_SETTIMEOUT:
return autofs4_get_set_timeout(sbi,(unsigned long *)arg);
* linux/fs/autofs/waitq.c
*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ * Copyright 2001-2003 Ian Kent <raven@themaw.net>
*
* 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
autofs4_catatonic_mode(sbi);
}
-int autofs4_wait(struct autofs_sb_info *sbi, struct qstr *name,
+static int autofs4_getpath(struct autofs_sb_info *sbi,
+ struct dentry *dentry, char **name)
+{
+ struct dentry *root = sbi->sb->s_root;
+ struct dentry *tmp;
+ char *buf = *name;
+ char *p;
+ int len = 0;
+
+ spin_lock(&dcache_lock);
+ for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
+ len += tmp->d_name.len + 1;
+
+ if (--len > NAME_MAX) {
+ spin_unlock(&dcache_lock);
+ return 0;
+ }
+
+ *(buf + len) = '\0';
+ p = buf + len - dentry->d_name.len;
+ strncpy(p, dentry->d_name.name, dentry->d_name.len);
+
+ for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) {
+ *(--p) = '/';
+ p -= tmp->d_name.len;
+ strncpy(p, tmp->d_name.name, tmp->d_name.len);
+ }
+ spin_unlock(&dcache_lock);
+
+ return len;
+}
+
+int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
enum autofs_notify notify)
{
struct autofs_wait_queue *wq;
- int status;
+ char *name;
+ int len, 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 )
+ name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+
+ len = autofs4_getpath(sbi, dentry, &name);
+ if (!len) {
+ kfree(name);
return -ENOENT;
+ }
spin_lock(&waitq_lock);
- 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) )
+ for (wq = sbi->queues ; wq ; wq = wq->next) {
+ if (wq->hash == dentry->d_name.hash &&
+ wq->len == len &&
+ wq->name && !memcmp(wq->name, name, len))
break;
}
spin_unlock(&waitq_lock);
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);
+ if ( !wq ) {
+ kfree(name);
return -ENOMEM;
}
sbi->queues = wq;
spin_unlock(&waitq_lock);
init_waitqueue_head(&wq->queue);
- wq->hash = name->hash;
- wq->len = name->len;
+ wq->hash = dentry->d_name.hash;
+ wq->name = name;
+ wq->len = len;
wq->status = -EINTR; /* Status return if interrupted */
- memcpy(wq->name, name->name, name->len);
DPRINTK(("autofs4_wait: new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
(unsigned long) wq->wait_queue_token, wq->len, wq->name, notify));
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