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-rw-r--r--fs/autofs4/inode.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
new file mode 100644
index 000000000000..a52560746628
--- /dev/null
+++ b/fs/autofs4/inode.c
@@ -0,0 +1,324 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * linux/fs/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/slab.h>
+#include <linux/file.h>
+#include <linux/pagemap.h>
+#include <linux/parser.h>
+#include <linux/bitops.h>
+#include "autofs_i.h"
+#include <linux/module.h>
+
+static void ino_lnkfree(struct autofs_info *ino)
+{
+ if (ino->u.symlink) {
+ kfree(ino->u.symlink);
+ ino->u.symlink = NULL;
+ }
+}
+
+struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
+ struct autofs_sb_info *sbi, mode_t mode)
+{
+ int reinit = 1;
+
+ if (ino == NULL) {
+ reinit = 0;
+ ino = kmalloc(sizeof(*ino), GFP_KERNEL);
+ }
+
+ if (ino == NULL)
+ return NULL;
+
+ ino->flags = 0;
+ ino->mode = mode;
+ ino->inode = NULL;
+ ino->dentry = NULL;
+ ino->size = 0;
+
+ ino->last_used = jiffies;
+
+ ino->sbi = sbi;
+
+ if (reinit && ino->free)
+ (ino->free)(ino);
+
+ memset(&ino->u, 0, sizeof(ino->u));
+
+ ino->free = NULL;
+
+ if (S_ISLNK(mode))
+ ino->free = ino_lnkfree;
+
+ return ino;
+}
+
+void autofs4_free_ino(struct autofs_info *ino)
+{
+ if (ino->dentry) {
+ ino->dentry->d_fsdata = NULL;
+ if (ino->dentry->d_inode)
+ dput(ino->dentry);
+ ino->dentry = NULL;
+ }
+ if (ino->free)
+ (ino->free)(ino);
+ kfree(ino);
+}
+
+static void autofs4_put_super(struct super_block *sb)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+ sb->s_fs_info = NULL;
+
+ if ( !sbi->catatonic )
+ autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+ kfree(sbi);
+
+ DPRINTK("shutting down");
+}
+
+static struct super_operations autofs4_sops = {
+ .put_super = autofs4_put_super,
+ .statfs = simple_statfs,
+};
+
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static match_table_t 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 = process_group(current);
+
+ *minproto = AUTOFS_MIN_PROTO_VERSION;
+ *maxproto = AUTOFS_MAX_PROTO_VERSION;
+
+ *pipefd = -1;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_fd:
+ if (match_int(args, pipefd))
+ return 1;
+ break;
+ case Opt_uid:
+ if (match_int(args, &option))
+ return 1;
+ *uid = option;
+ break;
+ case Opt_gid:
+ if (match_int(args, &option))
+ return 1;
+ *gid = option;
+ break;
+ case Opt_pgrp:
+ if (match_int(args, &option))
+ return 1;
+ *pgrp = option;
+ break;
+ case Opt_minproto:
+ if (match_int(args, &option))
+ return 1;
+ *minproto = option;
+ break;
+ case Opt_maxproto:
+ if (match_int(args, &option))
+ return 1;
+ *maxproto = option;
+ break;
+ default:
+ return 1;
+ }
+ }
+ return (*pipefd < 0);
+}
+
+static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
+{
+ struct autofs_info *ino;
+
+ ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
+ if (!ino)
+ return NULL;
+
+ return ino;
+}
+
+int autofs4_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;
+ struct autofs_info *ino;
+ int minproto, maxproto;
+
+ sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
+ if ( !sbi )
+ goto fail_unlock;
+ DPRINTK("starting up, sbi = %p",sbi);
+
+ memset(sbi, 0, sizeof(*sbi));
+
+ s->s_fs_info = sbi;
+ sbi->magic = AUTOFS_SBI_MAGIC;
+ sbi->catatonic = 0;
+ sbi->exp_timeout = 0;
+ sbi->oz_pgrp = process_group(current);
+ sbi->sb = s;
+ sbi->version = 0;
+ sbi->sub_version = 0;
+ init_MUTEX(&sbi->wq_sem);
+ sbi->queues = NULL;
+ s->s_blocksize = 1024;
+ s->s_blocksize_bits = 10;
+ s->s_magic = AUTOFS_SUPER_MAGIC;
+ s->s_op = &autofs4_sops;
+ s->s_time_gran = 1;
+
+ /*
+ * Get the root inode and dentry, but defer checking for errors.
+ */
+ ino = autofs4_mkroot(sbi);
+ if (!ino)
+ goto fail_free;
+ root_inode = autofs4_get_inode(s, ino);
+ kfree(ino);
+ if (!root_inode)
+ goto fail_free;
+
+ root_inode->i_op = &autofs4_root_inode_operations;
+ root_inode->i_fop = &autofs4_root_operations;
+ root = d_alloc_root(root_inode);
+ pipe = NULL;
+
+ if (!root)
+ goto fail_iput;
+
+ /* Can this call block? */
+ if (parse_options(data, &pipefd,
+ &root_inode->i_uid, &root_inode->i_gid,
+ &sbi->oz_pgrp,
+ &minproto, &maxproto)) {
+ printk("autofs: called with bogus options\n");
+ goto fail_dput;
+ }
+
+ /* Couldn't this be tested earlier? */
+ if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
+ minproto > AUTOFS_MAX_PROTO_VERSION) {
+ printk("autofs: kernel does not match daemon version "
+ "daemon (%d, %d) kernel (%d, %d)\n",
+ minproto, maxproto,
+ AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
+ goto fail_dput;
+ }
+
+ sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+ sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
+
+ DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
+ pipe = fget(pipefd);
+
+ if ( !pipe ) {
+ printk("autofs: could not open pipe file descriptor\n");
+ goto fail_dput;
+ }
+ if ( !pipe->f_op || !pipe->f_op->write )
+ goto fail_fput;
+ sbi->pipe = pipe;
+
+ /*
+ * Success! Install the root dentry now to indicate completion.
+ */
+ s->s_root = root;
+ return 0;
+
+ /*
+ * Failure ... clean up.
+ */
+fail_fput:
+ printk("autofs: pipe file descriptor does not contain proper ops\n");
+ fput(pipe);
+ /* fall through */
+fail_dput:
+ dput(root);
+ goto fail_free;
+fail_iput:
+ printk("autofs: get root dentry failed\n");
+ iput(root_inode);
+fail_free:
+ kfree(sbi);
+fail_unlock:
+ return -EINVAL;
+}
+
+struct inode *autofs4_get_inode(struct super_block *sb,
+ struct autofs_info *inf)
+{
+ struct inode *inode = new_inode(sb);
+
+ if (inode == NULL)
+ return NULL;
+
+ inf->inode = inode;
+ inode->i_mode = inf->mode;
+ if (sb->s_root) {
+ inode->i_uid = sb->s_root->d_inode->i_uid;
+ inode->i_gid = sb->s_root->d_inode->i_gid;
+ } else {
+ inode->i_uid = 0;
+ inode->i_gid = 0;
+ }
+ inode->i_blksize = PAGE_CACHE_SIZE;
+ inode->i_blocks = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ if (S_ISDIR(inf->mode)) {
+ inode->i_nlink = 2;
+ inode->i_op = &autofs4_dir_inode_operations;
+ inode->i_fop = &autofs4_dir_operations;
+ } else if (S_ISLNK(inf->mode)) {
+ inode->i_size = inf->size;
+ inode->i_op = &autofs4_symlink_inode_operations;
+ }
+
+ return inode;
+}