mirror of
git://sourceware.org/git/lvm2.git
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133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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* dmfs-lv.c
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*
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* Copyright (C) 2001 Sistina Software
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*
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* This software is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* Heavily based upon ramfs */
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#include <linux/config.h>
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#include <linux/fs.h>
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static int dmfs_lv_create(struct inode *dir, struct dentry *dentry, int mode)
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{
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struct inode *inode;
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struct dm_table *table;
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if (dentry->d_name.name[0] == '.')
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return -EPERM;
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if (dentry->d_name.len == 6 &&
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memcmp(dentry->d_name.name, "ACTIVE", 6) == 0)
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return -EPERM;
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inode = dmfs_create_table(dir, dentry, mode)
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if (!IS_ERR(inode)) {
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table = dm_table_create();
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if (table) {
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d_instantiate(dentry, inode);
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dget(dentry);
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return 0;
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}
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iput(inode);
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return -ENOMEM;
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}
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return PTR_ERR(inode);
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}
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static int dmfs_lv_unlink(struct inode *dir, struct dentry *dentry)
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{
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inode->i_nlink--;
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dput(dentry);
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return 0;
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}
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static int dmfs_lv_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = old_dentry->d_inode;
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if (!S_ISREG(inode->i_mode))
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return -EPERM;
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if (dentry->d_parent != old_dentry->d_parent)
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return -EPERM;
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if (dentry->d_name[0] == '.')
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return -EPERM;
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inode->i_ctime = CURRENT_TIME;
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return 0;
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}
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static struct dentry *dmfs_lv_lookup(struct inode *dir, struct dentry *dentry)
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{
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d_add(dentry, NULL);
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return NULL;
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}
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static int dmfs_lv_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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if (old_dir != new_dir)
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return -EPERM;
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return 0;
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}
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static int dmfs_lv_sync(struct file *file, struct dentry *dentry, int datasync)
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{
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return 0;
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}
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static struct dmfs_lv_file_operations = {
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read: generic_read_dir,
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readdir: dcache_readdir,
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fsync: dmfs_lv_sync,
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};
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static struct dmfs_lv_inode_operations = {
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create: dmfs_lv_create,
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lookup: dmfs_lv_lookup,
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link: dmfs_lv_link,
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unlink: dmfs_lv_unlink,
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rename: dmfs_lv_rename,
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};
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struct inode *dmfs_create_lv(struct inode *dir, struct dentry *dentry, int mode)
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{
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_mode = mode | S_IFDIR;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_blksize = PAGE_CACHE_SIZE;
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inode->i_blocks = 0;
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inode->i_rdev = NODEV;
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inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
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inode->i_fop = &dmfs_lv_file_operations;
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inode->i_op = &dmfs_lv_dir_operations;
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}
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return inode;
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}
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