diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/autofs4/inode.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/autofs4/inode.c')
-rw-r--r-- | fs/autofs4/inode.c | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c new file mode 100644 index 0000000..a525607 --- /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; +} |