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fs/autofs/inode.c
6.67 KB
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/* -*- 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> |
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#include <linux/magic.h> |
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#include "autofs_i.h" #include <linux/module.h> |
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void autofs_kill_sb(struct super_block *sb) |
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{ struct autofs_sb_info *sbi = autofs_sbi(sb); unsigned int n; |
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/* * In the event of a failure in get_sb_nodev the superblock * info is not present so nothing else has been setup, so |
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* just call kill_anon_super when we are called from * deactivate_super. |
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*/ if (!sbi) |
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goto out_kill_sb; |
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if (!sbi->catatonic) |
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autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */ |
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put_pid(sbi->oz_pgrp); |
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autofs_hash_nuke(sbi); |
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for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) { if (test_bit(n, sbi->symlink_bitmap)) |
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kfree(sbi->symlink[n].data); } kfree(sb->s_fs_info); |
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out_kill_sb: |
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DPRINTK(("autofs: shutting down ")); |
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kill_anon_super(sb); |
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} |
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static const struct super_operations autofs_sops = { |
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.statfs = simple_statfs, |
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.show_options = generic_show_options, |
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}; enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto}; |
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static const match_table_t autofs_tokens = { |
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{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} }; |
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static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto) |
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{ char *p; substring_t args[MAX_OPT_ARGS]; int option; |
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*uid = current_uid(); *gid = current_gid(); |
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*pgrp = task_pgrp_nr(current); |
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*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; |
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pid_t pgid; |
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save_mount_options(s, data); |
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
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if (!sbi) |
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goto fail_unlock; |
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DPRINTK(("autofs: starting up, sbi = %p ",sbi)); s->s_fs_info = sbi; sbi->magic = AUTOFS_SBI_MAGIC; |
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sbi->pipe = NULL; sbi->catatonic = 1; |
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sbi->exp_timeout = 0; |
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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; |
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sbi->sb = s; |
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root_inode = autofs_iget(s, AUTOFS_ROOT_INO); if (IS_ERR(root_inode)) goto fail_free; |
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root = d_alloc_root(root_inode); pipe = NULL; if (!root) goto fail_iput; /* Can this call block? - WTF cares? s is locked. */ |
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if (parse_options(data, &pipefd, &root_inode->i_uid, |
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&root_inode->i_gid, &pgid, &minproto, |
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&maxproto)) { |
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printk("autofs: called with bogus options "); goto fail_dput; } /* Couldn't this be tested earlier? */ |
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if (minproto > AUTOFS_PROTO_VERSION || maxproto < AUTOFS_PROTO_VERSION) { |
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printk("autofs: kernel does not match daemon version "); goto fail_dput; } |
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DPRINTK(("autofs: pipe fd = %d, pgrp = %u ", pipefd, pgid)); sbi->oz_pgrp = find_get_pid(pgid); if (!sbi->oz_pgrp) { printk("autofs: could not find process group %d ", pgid); goto fail_dput; } |
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pipe = fget(pipefd); |
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if (!pipe) { |
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printk("autofs: could not open pipe file descriptor "); |
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goto fail_put_pid; |
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} |
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if (!pipe->f_op || !pipe->f_op->write) |
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goto fail_fput; sbi->pipe = pipe; |
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sbi->catatonic = 0; |
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/* * 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 "); fput(pipe); |
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fail_put_pid: put_pid(sbi->oz_pgrp); |
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fail_dput: dput(root); goto fail_free; fail_iput: printk("autofs: get root dentry failed "); iput(root_inode); fail_free: kfree(sbi); |
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s->s_fs_info = NULL; |
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fail_unlock: return -EINVAL; } |
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struct inode *autofs_iget(struct super_block *sb, unsigned long ino) |
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{ |
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unsigned int n; |
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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; |
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/* 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; |
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if (ino == AUTOFS_ROOT_INO) { |
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inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR; inode->i_op = &autofs_root_inode_operations; inode->i_fop = &autofs_root_operations; |
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goto done; |
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} inode->i_uid = inode->i_sb->s_root->d_inode->i_uid; inode->i_gid = inode->i_sb->s_root->d_inode->i_gid; |
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if (ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO) { |
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/* Symlink inode - should be in symlink list */ struct autofs_symlink *sl; n = ino - AUTOFS_FIRST_SYMLINK; |
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if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) { |
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printk("autofs: Looking for bad symlink inode %u ", (unsigned int) ino); |
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goto done; |
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} inode->i_op = &autofs_symlink_inode_operations; sl = &sbi->symlink[n]; |
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inode->i_private = sl; |
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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; } |
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done: unlock_new_inode(inode); return inode; |
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} |