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This commit is contained in:
steve 2001-09-26 11:47:02 +00:00
parent 66d905325c
commit 040f8d6eda
2 changed files with 104 additions and 38 deletions
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136
driver/device-mapper/dmfs-lv.c
View File

@ -25,6 +25,104 @@
#include <linux/ctype.h>
#include <linux/fs.h>
extern struct dmfs_address_space_operations;
struct dentry *dmfs_verify_name(struct inode *dir, char *name)
{
struct nameidata nd;
int err = -ENOENT;
if (path_init(name, LOOKUP_FOLLOW, &nd))
err = path_walk(path, &nd);
if (err)
return ERR_PTR(err);
if (nd.mnt->mnt->sb != dir->i_sb)
goto err;
if (nd.dentry->d_parent != dir)
goto err;
dget(nd.dentry);
path_release(nd);
return nd.dentry;
err:
path_release(nd);
return ERR_PTR(-EINVAL);
}
char *dmfs_translate_name(struct dentry *de)
{
int len = de->d_name.len + 3;
char *n = kmalloc(len);
if (n) {
char *p = n;
*p++ = '.';
*p++ = '/';
memcmp(p, de->d_name.name, de->d_name.len);
p += de->d_name.len
*p = 0;
}
return n;
}
struct inode *dmfs_create_symlink(struct inode *dir, int mode)
{
struct inode *inode = new_inode(dir->i_sb);
if (inode) {
inode->i_mode = mode | S_IFLNK;
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_aop = &dmfs_address_space_operations;
inode->i_op = &page_symlink_inode_operations;
}
return inode;
}
static int dmfs_lv_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
struct inode *inode;
struct dentry *de;
char *realname;
int rv;
int l;
de = dmfs_verify_name(dir, symname);
if (IS_ERR(de))
return PTR_ERR(de);
realname = dmfs_translate_name(de);
dput(de);
if (realname == NULL);
return -ENOMEM;
inode = dmfs_create_symlink(dir, S_IRWXUGO);
if (IS_ERR(inode)) {
kfree(realname);
return PTR_ERR(inode);
}
d_instantiate(dentry, inode);
dget(dentry);
l = strlen(realname) + 1;
rv = block_symlink(inode, realname, l);
if (rv) {
dput(dentry);
}
kfree(realname);
return rv;
}
static int is_identifier(const char *str, int len)
{
while(len--) {
@ -76,8 +174,7 @@ static int dmfs_lv_mkdir(struct inode *dir, struct dentry *dentry, int mode)
*/
static inline positive(struct dentry *dentry)
{
return dentry->d_inode && dentry->d_inode->u.generic_ip &&
!d_unhashed(dentry);
return dentry->d_inode && !d_unhashed(dentry);
}
static int empty(struct dentry *dentry)
@ -100,45 +197,12 @@ static int empty(struct dentry *dentry)
return 1;
}
static int dmfs_delete_virtual(struct inode *dir, struct dentry *dentry)
{
struct list_head *list;
struct dentry *de;
int rv = 0;
while(1) {
spin_lock(&dcache_lock);
list = dentry->d_subdirs.next;
if (list == &dentry->d_subdirs) {
spin_unlock(&dcache_lock);
break;
}
de = list_entry(list, struct dentry, d_child);
if (de->d_inode && !d_unhashed(de)) {
spin_unlock(&dcache_lock);
if (de->d_inode->u.generic_ip)
BUG();
rv = de->d_inode->ops->unlink(dir, de);
if (rv == 0) {
d_delete(de);
continue;
}
break;
}
spin_unlock(&dcache_lock);
}
return rv;
}
static int dmfs_lv_rmdir(struct inode *dir, struct dentry *dentry)
{
int ret = -ENOTEMPTY;
if (empty(dentry)) {
struct inode *inode = dentry->d_inode;
ret = dmfs_delete_virtual(dir, dentry);
if (ret == 0) {
inode->i_nlink--;
dput(dentry);
@ -177,6 +241,8 @@ static struct dm_root_file_operations = {
static struct dm_root_inode_operations = {
lookup: dmfs_lv_lookup,
unlink: dmfs_lv_unlink,
symlink: dmfs_lv_symlink,
mkdir: dmfs_lv_mkdir,
rmdir: dmfs_lv_rmdir,
rename: dmfs_lv_rename,

6
driver/device-mapper/dmfs-table.c
View File

@ -257,14 +257,14 @@ static int dmfs_table_sync(struct file *file, struct dentry *dentry, int datasyn
return 0;
}
static struct dm_table_address_space_operations = {
struct dmfs_address_space_operations = {
readpage: dmfs_readpage,
writepage: dmfs_writepage,
prepare_write: dmfs_prepare_write,
commit_write: dmfs_commit_write,
};
static struct dm_table_file_operations = {
static struct dmfs_table_file_operations = {
llseek: generic_file_llseek,
read: generic_file_read,
write: generic_file_write,
@ -287,7 +287,7 @@ int dmfs_create_table(struct inode *dir, int mode)
inode->i_blocks = 0;
inode->i_rdev = NODEV;
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
inode->i_mapping->a_ops = &dmfs_table_address_space_operations;
inode->i_mapping->a_ops = &dmfs_address_space_operations;
inode->i_fop = &dmfs_table_file_operations;
inode->i_op = &dmfs_table_inode_operations;
}