catalog.c

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/*
 *  linux/fs/hfsplus/catalog.c
 *
 * Copyright (C) 2001
 * Brad Boyer ([email protected])
 * (C) 2003 Ardis Technologies <[email protected]>
 *
 * Handling of catalog records
 */


#include "hfsplus_fs.h"
#include "hfsplus_raw.h"

int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
                 const hfsplus_btree_key *k2)
{
    __be32 k1p, k2p;

    k1p = k1->cat.parent;
    k2p = k2->cat.parent;
    if (k1p != k2p)
        return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;

    return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
}

int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
                const hfsplus_btree_key *k2)
{
    __be32 k1p, k2p;

    k1p = k1->cat.parent;
    k2p = k2->cat.parent;
    if (k1p != k2p)
        return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;

    return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
}

void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
               u32 parent, struct qstr *str)
{
    int len;

    key->cat.parent = cpu_to_be32(parent);
    if (str) {
        hfsplus_asc2uni(sb, &key->cat.name, str->name, str->len);
        len = be16_to_cpu(key->cat.name.length);
    } else {
        key->cat.name.length = 0;
        len = 0;
    }
    key->key_len = cpu_to_be16(6 + 2 * len);
}

static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
                      struct hfsplus_unistr *name)
{
    int ustrlen;

    ustrlen = be16_to_cpu(name->length);
    key->cat.parent = cpu_to_be32(parent);
    key->cat.name.length = cpu_to_be16(ustrlen);
    ustrlen *= 2;
    memcpy(key->cat.name.unicode, name->unicode, ustrlen);
    key->key_len = cpu_to_be16(6 + ustrlen);
}

void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
{
    if (inode->i_flags & S_IMMUTABLE)
        perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
    else
        perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
    if (inode->i_flags & S_APPEND)
        perms->rootflags |= HFSPLUS_FLG_APPEND;
    else
        perms->rootflags &= ~HFSPLUS_FLG_APPEND;

    perms->userflags = HFSPLUS_I(inode)->userflags;
    perms->mode = cpu_to_be16(inode->i_mode);
    perms->owner = cpu_to_be32(i_uid_read(inode));
    perms->group = cpu_to_be32(i_gid_read(inode));

    if (S_ISREG(inode->i_mode))
        perms->dev = cpu_to_be32(inode->i_nlink);
    else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
        perms->dev = cpu_to_be32(inode->i_rdev);
    else
        perms->dev = 0;
}

static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
        u32 cnid, struct inode *inode)
{
    struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);

    if (S_ISDIR(inode->i_mode)) {
        struct hfsplus_cat_folder *folder;

        folder = &entry->folder;
        memset(folder, 0, sizeof(*folder));
        folder->type = cpu_to_be16(HFSPLUS_FOLDER);
        folder->id = cpu_to_be32(inode->i_ino);
        HFSPLUS_I(inode)->create_date =
            folder->create_date =
            folder->content_mod_date =
            folder->attribute_mod_date =
            folder->access_date = hfsp_now2mt();
        hfsplus_cat_set_perms(inode, &folder->permissions);
        if (inode == sbi->hidden_dir)
            /* invisible and namelocked */
            folder->user_info.frFlags = cpu_to_be16(0x5000);
        return sizeof(*folder);
    } else {
        struct hfsplus_cat_file *file;

        file = &entry->file;
        memset(file, 0, sizeof(*file));
        file->type = cpu_to_be16(HFSPLUS_FILE);
        file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
        file->id = cpu_to_be32(cnid);
        HFSPLUS_I(inode)->create_date =
            file->create_date =
            file->content_mod_date =
            file->attribute_mod_date =
            file->access_date = hfsp_now2mt();
        if (cnid == inode->i_ino) {
            hfsplus_cat_set_perms(inode, &file->permissions);
            if (S_ISLNK(inode->i_mode)) {
                file->user_info.fdType =
                    cpu_to_be32(HFSP_SYMLINK_TYPE);
                file->user_info.fdCreator =
                    cpu_to_be32(HFSP_SYMLINK_CREATOR);
            } else {
                file->user_info.fdType =
                    cpu_to_be32(sbi->type);
                file->user_info.fdCreator =
                    cpu_to_be32(sbi->creator);
            }
            if (HFSPLUS_FLG_IMMUTABLE &
                    (file->permissions.rootflags |
                    file->permissions.userflags))
                file->flags |=
                    cpu_to_be16(HFSPLUS_FILE_LOCKED);
        } else {
            file->user_info.fdType =
                cpu_to_be32(HFSP_HARDLINK_TYPE);
            file->user_info.fdCreator =
                cpu_to_be32(HFSP_HFSPLUS_CREATOR);
            file->user_info.fdFlags =
                cpu_to_be16(0x100);
            file->create_date =
                HFSPLUS_I(sbi->hidden_dir)->create_date;
            file->permissions.dev =
                cpu_to_be32(HFSPLUS_I(inode)->linkid);
        }
        return sizeof(*file);
    }
}

static int hfsplus_fill_cat_thread(struct super_block *sb,
                   hfsplus_cat_entry *entry, int type,
                   u32 parentid, struct qstr *str)
{
    entry->type = cpu_to_be16(type);
    entry->thread.reserved = 0;
    entry->thread.parentID = cpu_to_be32(parentid);
    hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
    return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
}

/* Try to get a catalog entry for given catalog id */
int hfsplus_find_cat(struct super_block *sb, u32 cnid,
             struct hfs_find_data *fd)
{
    hfsplus_cat_entry tmp;
    int err;
    u16 type;

    hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
    err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
    if (err)
        return err;

    type = be16_to_cpu(tmp.type);
    if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
        printk(KERN_ERR "hfs: found bad thread record in catalog\n");
        return -EIO;
    }

    if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
        printk(KERN_ERR "hfs: catalog name length corrupted\n");
        return -EIO;
    }

    hfsplus_cat_build_key_uni(fd->search_key,
        be32_to_cpu(tmp.thread.parentID),
        &tmp.thread.nodeName);
    return hfs_brec_find(fd);
}

int hfsplus_create_cat(u32 cnid, struct inode *dir,
        struct qstr *str, struct inode *inode)
{
    struct super_block *sb = dir->i_sb;
    struct hfs_find_data fd;
    hfsplus_cat_entry entry;
    int entry_size;
    int err;

    dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n",
        str->name, cnid, inode->i_nlink);
    err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
    if (err)
        return err;

    hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
    entry_size = hfsplus_fill_cat_thread(sb, &entry,
        S_ISDIR(inode->i_mode) ?
            HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
        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;

    hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
    entry_size = hfsplus_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;
    hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);

    hfs_find_exit(&fd);
    return 0;

err1:
    hfsplus_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;
}

int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
{
    struct super_block *sb = dir->i_sb;
    struct hfs_find_data fd;
    struct hfsplus_fork_raw fork;
    struct list_head *pos;
    int err, off;
    u16 type;

    dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n",
        str ? str->name : NULL, cnid);
    err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
    if (err)
        return err;

    if (!str) {
        int len;

        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
        err = hfs_brec_find(&fd);
        if (err)
            goto out;

        off = fd.entryoffset +
            offsetof(struct hfsplus_cat_thread, nodeName);
        fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
        hfs_bnode_read(fd.bnode,
            &fd.search_key->cat.name.length, off, 2);
        len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
        hfs_bnode_read(fd.bnode,
            &fd.search_key->cat.name.unicode,
            off + 2, len);
        fd.search_key->key_len = cpu_to_be16(6 + len);
    } else
        hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);

    err = hfs_brec_find(&fd);
    if (err)
        goto out;

    type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
    if (type == HFSPLUS_FILE) {
#if 0
        off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
        hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
        hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
#endif

        off = fd.entryoffset +
            offsetof(struct hfsplus_cat_file, rsrc_fork);
        hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
        hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
    }

    list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
        struct hfsplus_readdir_data *rd =
            list_entry(pos, struct hfsplus_readdir_data, list);
        if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
            rd->file->f_pos--;
    }

    err = hfs_brec_remove(&fd);
    if (err)
        goto out;

    hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
    err = hfs_brec_find(&fd);
    if (err)
        goto out;

    err = hfs_brec_remove(&fd);
    if (err)
        goto out;

    dir->i_size--;
    dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
    hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
out:
    hfs_find_exit(&fd);

    return err;
}

int hfsplus_rename_cat(u32 cnid,
               struct inode *src_dir, struct qstr *src_name,
               struct inode *dst_dir, struct qstr *dst_name)
{
    struct super_block *sb = src_dir->i_sb;
    struct hfs_find_data src_fd, dst_fd;
    hfsplus_cat_entry 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);
    err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
    if (err)
        return err;
    dst_fd = src_fd;

    /* find the old dir entry and read the data */
    hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
    err = hfs_brec_find(&src_fd);
    if (err)
        goto out;
    if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
        err = -EIO;
        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 */
    hfsplus_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;

    /* finally remove the old entry */
    hfsplus_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;

    /* remove old thread entry */
    hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
    err = hfs_brec_find(&src_fd);
    if (err)
        goto out;
    type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
    err = hfs_brec_remove(&src_fd);
    if (err)
        goto out;

    /* create new thread entry */
    hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
    entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
        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);

    hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
    hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
out:
    hfs_bnode_put(dst_fd.bnode);
    hfs_find_exit(&src_fd);
    return err;
}