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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/hfs/dir.c
Initial import
Diffstat (limited to 'fs/hfs/dir.c')
-rw-r--r--fs/hfs/dir.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
new file mode 100644
index 000000000..70788e038
--- /dev/null
+++ b/fs/hfs/dir.c
@@ -0,0 +1,319 @@
+/*
+ * linux/fs/hfs/dir.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 directory-related functions independent of which
+ * scheme is being used to represent forks.
+ *
+ * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
+ */
+
+#include "hfs_fs.h"
+#include "btree.h"
+
+/*
+ * hfs_lookup()
+ */
+static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int flags)
+{
+ hfs_cat_rec rec;
+ struct hfs_find_data fd;
+ struct inode *inode = NULL;
+ int res;
+
+ res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
+ if (res)
+ return ERR_PTR(res);
+ hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
+ res = hfs_brec_read(&fd, &rec, sizeof(rec));
+ if (res) {
+ hfs_find_exit(&fd);
+ if (res == -ENOENT) {
+ /* No such entry */
+ inode = NULL;
+ goto done;
+ }
+ return ERR_PTR(res);
+ }
+ inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
+ hfs_find_exit(&fd);
+ if (!inode)
+ return ERR_PTR(-EACCES);
+done:
+ d_add(dentry, inode);
+ return NULL;
+}
+
+/*
+ * hfs_readdir
+ */
+static int hfs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ struct super_block *sb = inode->i_sb;
+ int len, err;
+ char strbuf[HFS_MAX_NAMELEN];
+ union hfs_cat_rec entry;
+ struct hfs_find_data fd;
+ struct hfs_readdir_data *rd;
+ u16 type;
+
+ if (ctx->pos >= inode->i_size)
+ return 0;
+
+ err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return err;
+ hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
+ err = hfs_brec_find(&fd);
+ if (err)
+ goto out;
+
+ if (ctx->pos == 0) {
+ /* This is completely artificial... */
+ if (!dir_emit_dot(file, ctx))
+ goto out;
+ ctx->pos = 1;
+ }
+ if (ctx->pos == 1) {
+ if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
+ err = -EIO;
+ goto out;
+ }
+
+ hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+ if (entry.type != HFS_CDR_THD) {
+ pr_err("bad catalog folder thread\n");
+ err = -EIO;
+ goto out;
+ }
+ //if (fd.entrylength < HFS_MIN_THREAD_SZ) {
+ // pr_err("truncated catalog thread\n");
+ // err = -EIO;
+ // goto out;
+ //}
+ if (!dir_emit(ctx, "..", 2,
+ be32_to_cpu(entry.thread.ParID), DT_DIR))
+ goto out;
+ ctx->pos = 2;
+ }
+ if (ctx->pos >= inode->i_size)
+ goto out;
+ err = hfs_brec_goto(&fd, ctx->pos - 1);
+ if (err)
+ goto out;
+
+ for (;;) {
+ if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
+ pr_err("walked past end of dir\n");
+ err = -EIO;
+ goto out;
+ }
+
+ if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
+ err = -EIO;
+ goto out;
+ }
+
+ hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+ type = entry.type;
+ len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
+ if (type == HFS_CDR_DIR) {
+ if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
+ pr_err("small dir entry\n");
+ err = -EIO;
+ goto out;
+ }
+ if (!dir_emit(ctx, strbuf, len,
+ be32_to_cpu(entry.dir.DirID), DT_DIR))
+ break;
+ } else if (type == HFS_CDR_FIL) {
+ if (fd.entrylength < sizeof(struct hfs_cat_file)) {
+ pr_err("small file entry\n");
+ err = -EIO;
+ goto out;
+ }
+ if (!dir_emit(ctx, strbuf, len,
+ be32_to_cpu(entry.file.FlNum), DT_REG))
+ break;
+ } else {
+ pr_err("bad catalog entry type %d\n", type);
+ err = -EIO;
+ goto out;
+ }
+ ctx->pos++;
+ if (ctx->pos >= inode->i_size)
+ goto out;
+ err = hfs_brec_goto(&fd, 1);
+ if (err)
+ goto out;
+ }
+ rd = file->private_data;
+ if (!rd) {
+ rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
+ if (!rd) {
+ err = -ENOMEM;
+ goto out;
+ }
+ file->private_data = rd;
+ rd->file = file;
+ list_add(&rd->list, &HFS_I(inode)->open_dir_list);
+ }
+ memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
+out:
+ hfs_find_exit(&fd);
+ return err;
+}
+
+static int hfs_dir_release(struct inode *inode, struct file *file)
+{
+ struct hfs_readdir_data *rd = file->private_data;
+ if (rd) {
+ mutex_lock(&inode->i_mutex);
+ list_del(&rd->list);
+ mutex_unlock(&inode->i_mutex);
+ kfree(rd);
+ }
+ return 0;
+}
+
+/*
+ * hfs_create()
+ *
+ * This is the create() entry in the inode_operations structure for
+ * regular HFS directories. The purpose is to create a new file in
+ * a directory and return a corresponding inode, given the inode for
+ * the directory and the name (and its length) of the new file.
+ */
+static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool excl)
+{
+ struct inode *inode;
+ int res;
+
+ inode = hfs_new_inode(dir, &dentry->d_name, mode);
+ if (!inode)
+ return -ENOMEM;
+
+ res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res) {
+ clear_nlink(inode);
+ hfs_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+/*
+ * hfs_mkdir()
+ *
+ * This is the mkdir() entry in the inode_operations structure for
+ * regular HFS directories. The purpose is to create a new directory
+ * in a directory, given the inode for the parent directory and the
+ * name (and its length) of the new directory.
+ */
+static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode;
+ int res;
+
+ inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
+ if (!inode)
+ return -ENOMEM;
+
+ res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res) {
+ clear_nlink(inode);
+ hfs_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+/*
+ * hfs_remove()
+ *
+ * This serves as both unlink() and rmdir() in the inode_operations
+ * structure for regular HFS directories. The purpose is to delete
+ * an existing child, given the inode for the parent directory and
+ * the name (and its length) of the existing directory.
+ *
+ * HFS does not have hardlinks, so both rmdir and unlink set the
+ * link count to 0. The only difference is the emptiness check.
+ */
+static int hfs_remove(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = d_inode(dentry);
+ int res;
+
+ if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
+ return -ENOTEMPTY;
+ res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
+ if (res)
+ return res;
+ clear_nlink(inode);
+ inode->i_ctime = CURRENT_TIME_SEC;
+ hfs_delete_inode(inode);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+/*
+ * hfs_rename()
+ *
+ * This is the rename() entry in the inode_operations structure for
+ * regular HFS directories. The purpose is to rename an existing
+ * file or directory, given the inode for the current directory and
+ * the name (and its length) of the existing file/directory and the
+ * inode for the new directory and the name (and its length) of the
+ * new file/directory.
+ * XXX: how do you handle must_be dir?
+ */
+static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ int res;
+
+ /* Unlink destination if it already exists */
+ if (d_really_is_positive(new_dentry)) {
+ res = hfs_remove(new_dir, new_dentry);
+ if (res)
+ return res;
+ }
+
+ res = hfs_cat_move(d_inode(old_dentry)->i_ino,
+ old_dir, &old_dentry->d_name,
+ new_dir, &new_dentry->d_name);
+ if (!res)
+ hfs_cat_build_key(old_dir->i_sb,
+ (btree_key *)&HFS_I(d_inode(old_dentry))->cat_key,
+ new_dir->i_ino, &new_dentry->d_name);
+ return res;
+}
+
+const struct file_operations hfs_dir_operations = {
+ .read = generic_read_dir,
+ .iterate = hfs_readdir,
+ .llseek = generic_file_llseek,
+ .release = hfs_dir_release,
+};
+
+const struct inode_operations hfs_dir_inode_operations = {
+ .create = hfs_create,
+ .lookup = hfs_lookup,
+ .unlink = hfs_remove,
+ .mkdir = hfs_mkdir,
+ .rmdir = hfs_remove,
+ .rename = hfs_rename,
+ .setattr = hfs_inode_setattr,
+};