summaryrefslogtreecommitdiff
path: root/fs/autofs/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/autofs/inode.c')
-rw-r--r--fs/autofs/inode.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
new file mode 100644
index 00000000000..4888c1fabbf
--- /dev/null
+++ b/fs/autofs/inode.c
@@ -0,0 +1,250 @@
+/* -*- linux-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/mm.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/parser.h>
+#include <linux/bitops.h>
+#include "autofs_i.h"
+#include <linux/module.h>
+
+static void autofs_put_super(struct super_block *sb)
+{
+ struct autofs_sb_info *sbi = autofs_sbi(sb);
+ unsigned int n;
+
+ if ( !sbi->catatonic )
+ autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+ autofs_hash_nuke(&sbi->dirhash);
+ 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);
+
+ DPRINTK(("autofs: shutting down\n"));
+}
+
+static void autofs_read_inode(struct inode *inode);
+
+static struct super_operations autofs_sops = {
+ .read_inode = autofs_read_inode,
+ .put_super = autofs_put_super,
+ .statfs = simple_statfs,
+};
+
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static 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 = process_group(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;
+
+ sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
+ if ( !sbi )
+ goto fail_unlock;
+ memset(sbi, 0, sizeof(*sbi));
+ DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
+
+ s->s_fs_info = sbi;
+ sbi->magic = AUTOFS_SBI_MAGIC;
+ sbi->catatonic = 0;
+ sbi->exp_timeout = 0;
+ sbi->oz_pgrp = process_group(current);
+ 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;
+
+ root_inode = iget(s, AUTOFS_ROOT_INO);
+ 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,&sbi->oz_pgrp,&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, 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;
+
+fail_fput:
+ printk("autofs: pipe file descriptor does not contain proper ops\n");
+ fput(pipe);
+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;
+}
+
+static void autofs_read_inode(struct inode *inode)
+{
+ ino_t ino = inode->i_ino;
+ unsigned int n;
+ struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
+
+ /* 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;
+ inode->i_blocks = 0;
+ inode->i_blksize = 1024;
+
+ 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;
+ inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
+ return;
+ }
+
+ 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);
+ return;
+ }
+
+ inode->i_op = &autofs_symlink_inode_operations;
+ sl = &sbi->symlink[n];
+ inode->u.generic_ip = 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;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 13:38:54 +0000