diff options
Diffstat (limited to 'fs/autofs/inode.c')
| -rw-r--r-- | fs/autofs/inode.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c new file mode 100644 index 000000000..60b805a07 --- /dev/null +++ b/fs/autofs/inode.c @@ -0,0 +1,273 @@ +/* -*- linux-c -*- --------------------------------------------------------- * + * + * linux/fs/autofs/inode.c + * + * Copyright 1997 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/malloc.h> +#include <linux/file.h> +#include <linux/locks.h> +#include <asm/bitops.h> +#include <linux/auto_fs.h> +#define __NO_VERSION__ +#include <linux/module.h> + +static void autofs_put_inode(struct inode *inode) +{ + if (inode->i_nlink) + return; + inode->i_size = 0; +} + +static void autofs_put_super(struct super_block *sb) +{ + struct autofs_sb_info *sbi; + unsigned int n; + + lock_super(sb); + sbi = (struct autofs_sb_info *) sb->u.generic_sbp; + 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); + } + fput(sbi->pipe, sbi->pipe->f_inode); + + sb->s_dev = 0; + kfree(sb->u.generic_sbp); + unlock_super(sb); + + DPRINTK(("autofs: shutting down\n")); + +#ifdef MODULE + MOD_DEC_USE_COUNT; +#endif +} + +static void autofs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz); +static void autofs_read_inode(struct inode *inode); +static void autofs_write_inode(struct inode *inode); + +static struct super_operations autofs_sops = { + autofs_read_inode, + NULL, + autofs_write_inode, + autofs_put_inode, + autofs_put_super, + NULL, + autofs_statfs, + NULL +}; + +static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto) +{ + char *this_char, *value; + + *uid = current->uid; + *gid = current->gid; + *pgrp = current->pgrp; + + *minproto = *maxproto = AUTOFS_PROTO_VERSION; + + *pipefd = -1; + + if ( !options ) return 1; + for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) { + if ((value = strchr(this_char,'=')) != NULL) + *value++ = 0; + if (!strcmp(this_char,"fd")) { + if (!value || !*value) + return 1; + *pipefd = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else if (!strcmp(this_char,"uid")) { + if (!value || !*value) + return 1; + *uid = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else if (!strcmp(this_char,"gid")) { + if (!value || !*value) + return 1; + *gid = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else if (!strcmp(this_char,"pgrp")) { + if (!value || !*value) + return 1; + *pgrp = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else if (!strcmp(this_char,"minproto")) { + if (!value || !*value) + return 1; + *minproto = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else if (!strcmp(this_char,"maxproto")) { + if (!value || !*value) + return 1; + *maxproto = simple_strtoul(value,&value,0); + if (*value) + return 1; + } + else break; + } + return (*pipefd < 0); +} + +struct super_block *autofs_read_super(struct super_block *s, void *data, + int silent) +{ + int pipefd; + struct autofs_sb_info *sbi; + int minproto, maxproto; + + MOD_INC_USE_COUNT; + + lock_super(s); + sbi = (struct autofs_sb_info *) kmalloc(sizeof(struct autofs_sb_info), GFP_KERNEL); + if ( !sbi ) { + s->s_dev = 0; + MOD_DEC_USE_COUNT; + return NULL; + } + DPRINTK(("autofs: starting up, sbi = %p\n",sbi)); + + s->u.generic_sbp = sbi; + sbi->catatonic = 0; + sbi->oz_pgrp = current->pgrp; + autofs_initialize_hash(&sbi->dirhash); + sbi->queues = NULL; + memset(sbi->symlink_bitmap, 0, sizeof(u32)*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; + unlock_super(s); + if (!(s->s_mounted = iget(s, AUTOFS_ROOT_INO))) { + s->s_dev = 0; + kfree(sbi); + printk("autofs: get root inode failed\n"); + MOD_DEC_USE_COUNT; + return NULL; + } + + if ( parse_options(data,&pipefd,&s->s_mounted->i_uid,&s->s_mounted->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) { + iput(s->s_mounted); + s->s_dev = 0; + kfree(sbi); + printk("autofs: called with bogus options\n"); + MOD_DEC_USE_COUNT; + return NULL; + } + + if ( minproto > AUTOFS_PROTO_VERSION || maxproto < AUTOFS_PROTO_VERSION ) { + iput(s->s_mounted); + s->s_dev = 0; + kfree(sbi); + printk("autofs: kernel does not match daemon version\n"); + MOD_DEC_USE_COUNT; + return NULL; + } + + DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp)); + sbi->pipe = fget(pipefd); + if ( !sbi->pipe || !sbi->pipe->f_op || !sbi->pipe->f_op->write ) { + if ( sbi->pipe ) { + fput(sbi->pipe, sbi->pipe->f_inode); + printk("autofs: pipe file descriptor does not contain proper ops\n"); + } else { + printk("autofs: could not open pipe file descriptor\n"); + } + iput(s->s_mounted); + s->s_dev = 0; + kfree(sbi); + MOD_DEC_USE_COUNT; + return NULL; + } + return s; +} + +static void autofs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz) +{ + struct statfs tmp; + + tmp.f_type = AUTOFS_SUPER_MAGIC; + tmp.f_bsize = 1024; + tmp.f_blocks = 0; + tmp.f_bfree = 0; + tmp.f_bavail = 0; + tmp.f_files = 0; + tmp.f_ffree = 0; + tmp.f_namelen = NAME_MAX; + copy_to_user(buf, &tmp, bufsiz); +} + +static void autofs_read_inode(struct inode *inode) +{ + ino_t ino = inode->i_ino; + unsigned int n; + struct autofs_sb_info *sbi = + (struct autofs_sb_info *) inode->i_sb->u.generic_sbp; + + inode->i_op = NULL; + inode->i_mode = 0; + inode->i_nlink = 2; + inode->i_size = 0; + 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_uid = inode->i_gid = 0; /* Changed in read_super */ + return; + } + + inode->i_uid = inode->i_sb->s_mounted->i_uid; + inode->i_gid = inode->i_sb->s_mounted->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 0x%08x\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 = inode->i_ctime = sl->mtime; + inode->i_size = sl->len; + inode->i_nlink = 1; + } else { + /* All non-root directory inodes look the same */ + inode->i_op = &autofs_dir_inode_operations; + inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; + } +} + +static void autofs_write_inode(struct inode *inode) +{ + inode->i_dirt = 0; +} |