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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/hfs/catalog.c
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/hfs/catalog.c')
-rw-r--r--fs/hfs/catalog.c347
1 files changed, 347 insertions, 0 deletions
diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
new file mode 100644
index 00000000000..65dedefcabf
--- /dev/null
+++ b/fs/hfs/catalog.c
@@ -0,0 +1,347 @@
+/*
+ * 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(btree_key *key, u32 parent, struct qstr *name)
+{
+ key->cat.reserved = 0;
+ key->cat.ParID = cpu_to_be32(parent);
+ if (name) {
+ hfs_triv2mac(&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(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_triv2mac(&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(fd.search_key, cnid, NULL);
+ entry_size = hfs_cat_build_thread(&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(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(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(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("HFS-fs: 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(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(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(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(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(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(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(dst_fd.search_key, cnid, NULL);
+ entry_size = hfs_cat_build_thread(&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;
+}