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These files are now a bit closer towards what I'm aiming at. Still a lot

Browse Source 
more to do though.
This commit is contained in:
Steven Whitehouse 2001-09-18 16:54:14 +00:00
parent ab05a11ef5
commit a71f36113c
4 changed files with 21 additions and 184 deletions
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98
driver/device-mapper/dmfs-dir.c
View File

@ -1,98 +0,0 @@
/*
* dmfs-dir.c
*
* Copyright (C) 2001 Sistina Software
*
* This software is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* Heavily based upon ramfs */
static int dmfs_unlink(struct inode *dir, struct dentry *dentry)
{
}
static int dmfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
if (!S_ISREG(inode->i_mode))
return -EPERM;
if (dentry->d_parent != old_dentry->d_parent)
return -EPERM;
inode->i_ctime = CURRENT_TIME;
return 0;
}
static struct dentry *dmfs_lookup(struct inode *dir, struct dentry *dentry)
{
d_add(dentry, NULL);
return NULL;
}
static int dmfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
if (old_dir != new_dir)
return -EPERM;
return 0;
}
static int dmfs_dir_sync(struct file *file, struct dentry *dentry, int datasync)
{
return 0;
}
static struct dm_dir_file_operations = {
read: generic_read_dir,
readdir: dcache_readdir,
fsync: dmfs_dir_sync,
};
static struct dm_dir_inode_operations = {
create: dmfs_create_file,
lookup: dmfs_dir_lookup,
link: dmfs_dir_link,
unlink: dmfs_dir_unlink,
rename: dmfs_dir_rename,
};
struct inode *dmfs_create_dir(struct inode *dir, struct dentry *dentry, int mode)
{
struct inode *inode = new_inode(sb);
if (inode) {
inode->i_mode = mode | S_IFDIR;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_rdev = NODEV;
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
inode->i_fop = &dmfs_dir_file_operations;
inode->i_op = &dmfs_dir_dir_operations;
}
return inode;
}

74
driver/device-mapper/dmfs-file.c
View File

@ -1,74 +0,0 @@
/*
* dmfs-file.c
*
* Copyright (C) 2001 Sistina Software
*
* This software is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
static ssize_t dmfs_read(struct file *file, char *buf, size_t size, loff_t *pos)
{
}
static ssize_t dmfs_write(struct file *file, const char *buf, size_t size, loff_t *pos)
{
}
static int dmfs_open(struct inode *inode, struct file *file)
{
struct dentry *dentry = file->f_dentry;
if (dentry->name.len == 6 && memcmp("ACTIVE", dentry->name.name, 6) == 0)
return -EPERM;
return 0;
}
static int dmfs_file_sync(struct file *file, struct dentry *dentry, int datasync)
{
return 0;
}
static struct dm_file_file_operations = {
/* llseek: generic_file_llseek, */
read: dmfs_read,
write: dmfs_write,
open: dmfs_open,
fsync: dmfs_file_sync,
};
static struct dm_file_inode_operations = {
};
int dmfs_create_file(struct inode *dir, struct dentry *dentry, int mode)
{
struct inode *inode = new_inode(dir->i_sb);
if (inode) {
inode->i_mode = mode | S_IFREG;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_rdev = NODEV;
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
inode->i_fop = &dmfs_file_file_operations;
inode->i_op = &dmfs_file_inode_operations;
}
return inode;
}

23
driver/device-mapper/dmfs-root.c
View File

@ -38,22 +38,31 @@ static int is_identifier(const char *str, int len)
static int dmfs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode) static int dmfs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{ {
struct super_block *sb = dir->i_sb; struct super_block *sb = dir->i_sb;
int rv; struct inode *inode;
struct mapped_device *md;
if (!is_identifier(name, dentry->d_name.len)) if (!is_identifier(name, dentry->d_name.len))
return -EPERM; return -EPERM;
rv = dmfs_create_lv(dir, dentry, mode); inode = dmfs_create_lv(dir, dentry, mode);
if (rv == 0) { if (!IS_ERR(inode)) {
rv = dm_create(name, -1); md = dm_create(name, -1);
if (!IS_ERR(md)) {
inode->u.generic_ip = md;
md->inode = inode;
d_instantiate(dentry, inode);
dget(dentry);
return 0;
}
iput(inode);
return PTR_ERR(md);
} }
return PTR_ERR(inode);
return rv;
} }
static inline positive(struct dentry *dentry) static inline positive(struct dentry *dentry)
{ {
return dentry->d_inode && ! d_unhashed(dentry); return dentry->d_inode && !d_unhashed(dentry);
} }
static int empty(struct dentry *dentry) static int empty(struct dentry *dentry)

10
driver/device-mapper/dmfs-super.c
View File

@ -33,18 +33,18 @@ static int dmfs_statfs(struct super_block *sb, struct statfs *buf)
return 0; return 0;
} }
static int dmfs_delete_inode(struct inode *inode) static void dmfs_delete_inode(struct inode *inode)
{ {
struct super_block *sb = inode->i_sb; struct super_block *sb = inode->i_sb;
switch(inode->i_mode & S_IFMT) { switch(inode->i_mode & S_IFMT) {
case S_IFDIR: case S_IFDIR:
if (DMFS_LVI(inode)) if (inode->u.generic_ip) {
dmfs_lv_put_inode(inode); dm_remove((struct mapped_device *)inode->u.generic_ip);
inode->u.generic_ip = NULL;
}
break; break;
case S_IFREG: case S_IFREG:
if (DMFS_TI(inode))
dmfs_table_put_inode(inode);
break; break;
} }