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git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
o Lunchtime.
This commit is contained in:
Steven Whitehouse
parent
dd19ef9dd0
commit
cd624d3a4f
@ -25,6 +25,104 @@
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#include <linux/ctype.h>
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#include <linux/fs.h>
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extern struct dmfs_address_space_operations;
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struct dentry *dmfs_verify_name(struct inode *dir, char *name)
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{
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struct nameidata nd;
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int err = -ENOENT;
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if (path_init(name, LOOKUP_FOLLOW, &nd))
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err = path_walk(path, &nd);
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if (err)
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return ERR_PTR(err);
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if (nd.mnt->mnt->sb != dir->i_sb)
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goto err;
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if (nd.dentry->d_parent != dir)
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goto err;
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dget(nd.dentry);
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path_release(nd);
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return nd.dentry;
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err:
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path_release(nd);
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return ERR_PTR(-EINVAL);
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}
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char *dmfs_translate_name(struct dentry *de)
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{
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int len = de->d_name.len + 3;
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char *n = kmalloc(len);
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if (n) {
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char *p = n;
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*p++ = '.';
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*p++ = '/';
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memcmp(p, de->d_name.name, de->d_name.len);
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p += de->d_name.len
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*p = 0;
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}
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return n;
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}
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struct inode *dmfs_create_symlink(struct inode *dir, int mode)
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{
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struct inode *inode = new_inode(dir->i_sb);
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if (inode) {
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inode->i_mode = mode | S_IFLNK;
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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_aop = &dmfs_address_space_operations;
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inode->i_op = &page_symlink_inode_operations;
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}
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return inode;
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}
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static int dmfs_lv_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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struct inode *inode;
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struct dentry *de;
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char *realname;
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int rv;
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int l;
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de = dmfs_verify_name(dir, symname);
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if (IS_ERR(de))
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return PTR_ERR(de);
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realname = dmfs_translate_name(de);
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dput(de);
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if (realname == NULL);
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return -ENOMEM;
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inode = dmfs_create_symlink(dir, S_IRWXUGO);
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if (IS_ERR(inode)) {
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kfree(realname);
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return PTR_ERR(inode);
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}
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d_instantiate(dentry, inode);
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dget(dentry);
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l = strlen(realname) + 1;
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rv = block_symlink(inode, realname, l);
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if (rv) {
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dput(dentry);
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}
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kfree(realname);
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return rv;
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}
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static int is_identifier(const char *str, int len)
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{
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while(len--) {
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@ -76,8 +174,7 @@ static int dmfs_lv_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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*/
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static inline positive(struct dentry *dentry)
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{
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return dentry->d_inode && dentry->d_inode->u.generic_ip &&
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!d_unhashed(dentry);
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return dentry->d_inode && !d_unhashed(dentry);
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}
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static int empty(struct dentry *dentry)
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@ -100,45 +197,12 @@ static int empty(struct dentry *dentry)
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return 1;
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}
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static int dmfs_delete_virtual(struct inode *dir, struct dentry *dentry)
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{
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struct list_head *list;
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struct dentry *de;
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int rv = 0;
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while(1) {
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spin_lock(&dcache_lock);
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list = dentry->d_subdirs.next;
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if (list == &dentry->d_subdirs) {
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spin_unlock(&dcache_lock);
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break;
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}
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de = list_entry(list, struct dentry, d_child);
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if (de->d_inode && !d_unhashed(de)) {
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spin_unlock(&dcache_lock);
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if (de->d_inode->u.generic_ip)
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BUG();
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rv = de->d_inode->ops->unlink(dir, de);
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if (rv == 0) {
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d_delete(de);
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continue;
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}
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break;
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}
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spin_unlock(&dcache_lock);
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}
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return rv;
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}
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static int dmfs_lv_rmdir(struct inode *dir, struct dentry *dentry)
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{
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int ret = -ENOTEMPTY;
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if (empty(dentry)) {
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struct inode *inode = dentry->d_inode;
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ret = dmfs_delete_virtual(dir, dentry);
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if (ret == 0) {
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inode->i_nlink--;
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dput(dentry);
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@ -177,6 +241,8 @@ static struct dm_root_file_operations = {
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static struct dm_root_inode_operations = {
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lookup: dmfs_lv_lookup,
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unlink: dmfs_lv_unlink,
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symlink: dmfs_lv_symlink,
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mkdir: dmfs_lv_mkdir,
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rmdir: dmfs_lv_rmdir,
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rename: dmfs_lv_rename,
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@ -257,14 +257,14 @@ static int dmfs_table_sync(struct file *file, struct dentry *dentry, int datasyn
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return 0;
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}
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static struct dm_table_address_space_operations = {
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struct dmfs_address_space_operations = {
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readpage: dmfs_readpage,
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writepage: dmfs_writepage,
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prepare_write: dmfs_prepare_write,
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commit_write: dmfs_commit_write,
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};
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static struct dm_table_file_operations = {
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static struct dmfs_table_file_operations = {
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llseek: generic_file_llseek,
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read: generic_file_read,
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write: generic_file_write,
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@ -287,7 +287,7 @@ int dmfs_create_table(struct inode *dir, int mode)
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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_mapping->a_ops = &dmfs_table_address_space_operations;
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inode->i_mapping->a_ops = &dmfs_address_space_operations;
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inode->i_fop = &dmfs_table_file_operations;
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inode->i_op = &dmfs_table_inode_operations;
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}
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