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DEFINITIONS
This source file includes following definitions.
- hfs_cat_build_key
- hfs_cat_build_record
- hfs_cat_build_thread
- hfs_cat_create
- hfs_cat_keycmp
- hfs_cat_find_brec
- hfs_cat_delete
- hfs_cat_move
/*
* linux/fs/hfs/catalog.c
*
* Copyright (C) 1995-1997 Paul H. Hargrove
* (C) 2003 Ardis Technologies <roman@ardistech.com>
* This file may be distributed under the terms of the GNU General Public License.
*
* This file contains the functions related to the catalog B-tree.
*
* Cache code shamelessly stolen from
* linux/fs/inode.c Copyright (C) 1991, 1992 Linus Torvalds
* re-shamelessly stolen Copyright (C) 1997 Linus Torvalds
*/
#include "hfs_fs.h"
#include "btree.h"
/*
* hfs_cat_build_key()
*
* Given the ID of the parent and the name build a search key.
*/
void hfs_cat_build_key(struct super_block *sb, btree_key *key, u32 parent, struct qstr *name)
{
key->cat.reserved = 0;
key->cat.ParID = cpu_to_be32(parent);
if (name) {
hfs_asc2mac(sb, &key->cat.CName, name);
key->key_len = 6 + key->cat.CName.len;
} else {
memset(&key->cat.CName, 0, sizeof(struct hfs_name));
key->key_len = 6;
}
}
static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
{
__be32 mtime = hfs_mtime();
memset(rec, 0, sizeof(*rec));
if (S_ISDIR(inode->i_mode)) {
rec->type = HFS_CDR_DIR;
rec->dir.DirID = cpu_to_be32(cnid);
rec->dir.CrDat = mtime;
rec->dir.MdDat = mtime;
rec->dir.BkDat = 0;
rec->dir.UsrInfo.frView = cpu_to_be16(0xff);
return sizeof(struct hfs_cat_dir);
} else {
/* init some fields for the file record */
rec->type = HFS_CDR_FIL;
rec->file.Flags = HFS_FIL_USED | HFS_FIL_THD;
if (!(inode->i_mode & S_IWUSR))
rec->file.Flags |= HFS_FIL_LOCK;
rec->file.FlNum = cpu_to_be32(cnid);
rec->file.CrDat = mtime;
rec->file.MdDat = mtime;
rec->file.BkDat = 0;
rec->file.UsrWds.fdType = HFS_SB(inode->i_sb)->s_type;
rec->file.UsrWds.fdCreator = HFS_SB(inode->i_sb)->s_creator;
return sizeof(struct hfs_cat_file);
}
}
static int hfs_cat_build_thread(struct super_block *sb,
hfs_cat_rec *rec, int type,
u32 parentid, struct qstr *name)
{
rec->type = type;
memset(rec->thread.reserved, 0, sizeof(rec->thread.reserved));
rec->thread.ParID = cpu_to_be32(parentid);
hfs_asc2mac(sb, &rec->thread.CName, name);
return sizeof(struct hfs_cat_thread);
}
/*
* create_entry()
*
* Add a new file or directory to the catalog B-tree and
* return a (struct hfs_cat_entry) for it in '*result'.
*/
int hfs_cat_create(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
{
struct hfs_find_data fd;
struct super_block *sb;
union hfs_cat_rec entry;
int entry_size;
int err;
dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
if (dir->i_size >= HFS_MAX_VALENCE)
return -ENOSPC;
sb = dir->i_sb;
hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
entry_size = hfs_cat_build_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
HFS_CDR_THD : HFS_CDR_FTH,
dir->i_ino, str);
err = hfs_brec_find(&fd);
if (err != -ENOENT) {
if (!err)
err = -EEXIST;
goto err2;
}
err = hfs_brec_insert(&fd, &entry, entry_size);
if (err)
goto err2;
hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
entry_size = hfs_cat_build_record(&entry, cnid, inode);
err = hfs_brec_find(&fd);
if (err != -ENOENT) {
/* panic? */
if (!err)
err = -EEXIST;
goto err1;
}
err = hfs_brec_insert(&fd, &entry, entry_size);
if (err)
goto err1;
dir->i_size++;
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
hfs_find_exit(&fd);
return 0;
err1:
hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
if (!hfs_brec_find(&fd))
hfs_brec_remove(&fd);
err2:
hfs_find_exit(&fd);
return err;
}
/*
* hfs_cat_compare()
*
* Description:
* This is the comparison function used for the catalog B-tree. In
* comparing catalog B-tree entries, the parent id is the most
* significant field (compared as unsigned ints). The name field is
* the least significant (compared in "Macintosh lexical order",
* see hfs_strcmp() in string.c)
* Input Variable(s):
* struct hfs_cat_key *key1: pointer to the first key to compare
* struct hfs_cat_key *key2: pointer to the second key to compare
* Output Variable(s):
* NONE
* Returns:
* int: negative if key1<key2, positive if key1>key2, and 0 if key1==key2
* Preconditions:
* key1 and key2 point to "valid" (struct hfs_cat_key)s.
* Postconditions:
* This function has no side-effects
*/
int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2)
{
int retval;
retval = be32_to_cpu(key1->cat.ParID) - be32_to_cpu(key2->cat.ParID);
if (!retval)
retval = hfs_strcmp(key1->cat.CName.name, key1->cat.CName.len,
key2->cat.CName.name, key2->cat.CName.len);
return retval;
}
/* Try to get a catalog entry for given catalog id */
// move to read_super???
int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
struct hfs_find_data *fd)
{
hfs_cat_rec rec;
int res, len, type;
hfs_cat_build_key(sb, fd->search_key, cnid, NULL);
res = hfs_brec_read(fd, &rec, sizeof(rec));
if (res)
return res;
type = rec.type;
if (type != HFS_CDR_THD && type != HFS_CDR_FTH) {
printk(KERN_ERR "hfs: found bad thread record in catalog\n");
return -EIO;
}
fd->search_key->cat.ParID = rec.thread.ParID;
len = fd->search_key->cat.CName.len = rec.thread.CName.len;
memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
return hfs_brec_find(fd);
}
/*
* hfs_cat_delete()
*
* Delete the indicated file or directory.
* The associated thread is also removed unless ('with_thread'==0).
*/
int hfs_cat_delete(u32 cnid, struct inode *dir, struct qstr *str)
{
struct super_block *sb;
struct hfs_find_data fd;
struct list_head *pos;
int res, type;
dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
sb = dir->i_sb;
hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
res = hfs_brec_find(&fd);
if (res)
goto out;
type = hfs_bnode_read_u8(fd.bnode, fd.entryoffset);
if (type == HFS_CDR_FIL) {
struct hfs_cat_file file;
hfs_bnode_read(fd.bnode, &file, fd.entryoffset, sizeof(file));
if (be32_to_cpu(file.FlNum) == cnid) {
#if 0
hfs_free_fork(sb, &file, HFS_FK_DATA);
#endif
hfs_free_fork(sb, &file, HFS_FK_RSRC);
}
}
list_for_each(pos, &HFS_I(dir)->open_dir_list) {
struct hfs_readdir_data *rd =
list_entry(pos, struct hfs_readdir_data, list);
if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
rd->file->f_pos--;
}
res = hfs_brec_remove(&fd);
if (res)
goto out;
hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
res = hfs_brec_find(&fd);
if (!res) {
res = hfs_brec_remove(&fd);
if (res)
goto out;
}
dir->i_size--;
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
res = 0;
out:
hfs_find_exit(&fd);
return res;
}
/*
* hfs_cat_move()
*
* Rename a file or directory, possibly to a new directory.
* If the destination exists it is removed and a
* (struct hfs_cat_entry) for it is returned in '*result'.
*/
int hfs_cat_move(u32 cnid, struct inode *src_dir, struct qstr *src_name,
struct inode *dst_dir, struct qstr *dst_name)
{
struct super_block *sb;
struct hfs_find_data src_fd, dst_fd;
union hfs_cat_rec entry;
int entry_size, type;
int err;
dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
dst_dir->i_ino, dst_name->name);
sb = src_dir->i_sb;
hfs_find_init(HFS_SB(sb)->cat_tree, &src_fd);
dst_fd = src_fd;
/* find the old dir entry and read the data */
hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
err = hfs_brec_find(&src_fd);
if (err)
goto out;
hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
src_fd.entrylength);
/* create new dir entry with the data from the old entry */
hfs_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
err = hfs_brec_find(&dst_fd);
if (err != -ENOENT) {
if (!err)
err = -EEXIST;
goto out;
}
err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
if (err)
goto out;
dst_dir->i_size++;
dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dst_dir);
/* finally remove the old entry */
hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
err = hfs_brec_find(&src_fd);
if (err)
goto out;
err = hfs_brec_remove(&src_fd);
if (err)
goto out;
src_dir->i_size--;
src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(src_dir);
type = entry.type;
if (type == HFS_CDR_FIL && !(entry.file.Flags & HFS_FIL_THD))
goto out;
/* remove old thread entry */
hfs_cat_build_key(sb, src_fd.search_key, cnid, NULL);
err = hfs_brec_find(&src_fd);
if (err)
goto out;
err = hfs_brec_remove(&src_fd);
if (err)
goto out;
/* create new thread entry */
hfs_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
entry_size = hfs_cat_build_thread(sb, &entry, type == HFS_CDR_FIL ? HFS_CDR_FTH : HFS_CDR_THD,
dst_dir->i_ino, dst_name);
err = hfs_brec_find(&dst_fd);
if (err != -ENOENT) {
if (!err)
err = -EEXIST;
goto out;
}
err = hfs_brec_insert(&dst_fd, &entry, entry_size);
out:
hfs_bnode_put(dst_fd.bnode);
hfs_find_exit(&src_fd);
return err;
}