summaryrefslogtreecommitdiffstats
path: root/fs/hfsplus/dir.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/hfsplus/dir.c')
-rw-r--r--fs/hfsplus/dir.c484
1 files changed, 484 insertions, 0 deletions
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
new file mode 100644
index 000000000000..7bda76667a4a
--- /dev/null
+++ b/fs/hfsplus/dir.c
@@ -0,0 +1,484 @@
+/*
+ * linux/fs/hfsplus/dir.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of directories
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/version.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+static inline void hfsplus_instantiate(struct dentry *dentry,
+ struct inode *inode, u32 cnid)
+{
+ dentry->d_fsdata = (void *)(unsigned long)cnid;
+ d_instantiate(dentry, inode);
+}
+
+/* Find the entry inside dir named dentry->d_name */
+static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct inode *inode = NULL;
+ struct hfs_find_data fd;
+ struct super_block *sb;
+ hfsplus_cat_entry entry;
+ int err;
+ u32 cnid, linkid = 0;
+ u16 type;
+
+ sb = dir->i_sb;
+ dentry->d_fsdata = NULL;
+ hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+ hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
+again:
+ err = hfs_brec_read(&fd, &entry, sizeof(entry));
+ if (err) {
+ if (err == -ENOENT) {
+ hfs_find_exit(&fd);
+ /* No such entry */
+ inode = NULL;
+ goto out;
+ }
+ goto fail;
+ }
+ type = be16_to_cpu(entry.type);
+ if (type == HFSPLUS_FOLDER) {
+ if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
+ err = -EIO;
+ goto fail;
+ }
+ cnid = be32_to_cpu(entry.folder.id);
+ dentry->d_fsdata = (void *)(unsigned long)cnid;
+ } else if (type == HFSPLUS_FILE) {
+ if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
+ err = -EIO;
+ goto fail;
+ }
+ cnid = be32_to_cpu(entry.file.id);
+ if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
+ entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR)) {
+ struct qstr str;
+ char name[32];
+
+ if (dentry->d_fsdata) {
+ err = -ENOENT;
+ inode = NULL;
+ goto out;
+ }
+ dentry->d_fsdata = (void *)(unsigned long)cnid;
+ linkid = be32_to_cpu(entry.file.permissions.dev);
+ str.len = sprintf(name, "iNode%d", linkid);
+ str.name = name;
+ hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str);
+ goto again;
+ } else if (!dentry->d_fsdata)
+ dentry->d_fsdata = (void *)(unsigned long)cnid;
+ } else {
+ printk("HFS+-fs: Illegal catalog entry type in lookup\n");
+ err = -EIO;
+ goto fail;
+ }
+ hfs_find_exit(&fd);
+ inode = iget(dir->i_sb, cnid);
+ if (!inode)
+ return ERR_PTR(-EACCES);
+ if (S_ISREG(inode->i_mode))
+ HFSPLUS_I(inode).dev = linkid;
+out:
+ d_add(dentry, inode);
+ return NULL;
+fail:
+ hfs_find_exit(&fd);
+ return ERR_PTR(err);
+}
+
+static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct super_block *sb = inode->i_sb;
+ int len, err;
+ char strbuf[HFSPLUS_MAX_STRLEN + 1];
+ hfsplus_cat_entry entry;
+ struct hfs_find_data fd;
+ struct hfsplus_readdir_data *rd;
+ u16 type;
+
+ if (filp->f_pos >= inode->i_size)
+ return 0;
+
+ hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
+ hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
+ err = hfs_brec_find(&fd);
+ if (err)
+ goto out;
+
+ switch ((u32)filp->f_pos) {
+ case 0:
+ /* This is completely artificial... */
+ if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
+ goto out;
+ filp->f_pos++;
+ /* fall through */
+ case 1:
+ hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+ if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
+ printk("HFS+-fs: bad catalog folder thread\n");
+ err = -EIO;
+ goto out;
+ }
+ if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
+ printk("HFS+-fs: truncated catalog thread\n");
+ err = -EIO;
+ goto out;
+ }
+ if (filldir(dirent, "..", 2, 1,
+ be32_to_cpu(entry.thread.parentID), DT_DIR))
+ goto out;
+ filp->f_pos++;
+ /* fall through */
+ default:
+ if (filp->f_pos >= inode->i_size)
+ goto out;
+ err = hfs_brec_goto(&fd, filp->f_pos - 1);
+ if (err)
+ goto out;
+ }
+
+ for (;;) {
+ if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
+ printk("HFS+-fs: walked past end of dir\n");
+ err = -EIO;
+ goto out;
+ }
+ hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
+ type = be16_to_cpu(entry.type);
+ len = HFSPLUS_MAX_STRLEN;
+ err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
+ if (err)
+ goto out;
+ if (type == HFSPLUS_FOLDER) {
+ if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
+ printk("HFS+-fs: small dir entry\n");
+ err = -EIO;
+ goto out;
+ }
+ if (HFSPLUS_SB(sb).hidden_dir &&
+ HFSPLUS_SB(sb).hidden_dir->i_ino == be32_to_cpu(entry.folder.id))
+ goto next;
+ if (filldir(dirent, strbuf, len, filp->f_pos,
+ be32_to_cpu(entry.folder.id), DT_DIR))
+ break;
+ } else if (type == HFSPLUS_FILE) {
+ if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
+ printk("HFS+-fs: small file entry\n");
+ err = -EIO;
+ goto out;
+ }
+ if (filldir(dirent, strbuf, len, filp->f_pos,
+ be32_to_cpu(entry.file.id), DT_REG))
+ break;
+ } else {
+ printk("HFS+-fs: bad catalog entry type\n");
+ err = -EIO;
+ goto out;
+ }
+ next:
+ filp->f_pos++;
+ if (filp->f_pos >= inode->i_size)
+ goto out;
+ err = hfs_brec_goto(&fd, 1);
+ if (err)
+ goto out;
+ }
+ rd = filp->private_data;
+ if (!rd) {
+ rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
+ if (!rd) {
+ err = -ENOMEM;
+ goto out;
+ }
+ filp->private_data = rd;
+ rd->file = filp;
+ list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list);
+ }
+ memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
+out:
+ hfs_find_exit(&fd);
+ return err;
+}
+
+static int hfsplus_dir_release(struct inode *inode, struct file *file)
+{
+ struct hfsplus_readdir_data *rd = file->private_data;
+ if (rd) {
+ list_del(&rd->list);
+ kfree(rd);
+ }
+ return 0;
+}
+
+static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd)
+{
+ struct inode *inode;
+ int res;
+
+ inode = hfsplus_new_inode(dir->i_sb, mode);
+ if (!inode)
+ return -ENOSPC;
+
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res) {
+ inode->i_nlink = 0;
+ hfsplus_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
+ struct dentry *dst_dentry)
+{
+ struct super_block *sb = dst_dir->i_sb;
+ struct inode *inode = src_dentry->d_inode;
+ struct inode *src_dir = src_dentry->d_parent->d_inode;
+ struct qstr str;
+ char name[32];
+ u32 cnid, id;
+ int res;
+
+ if (HFSPLUS_IS_RSRC(inode))
+ return -EPERM;
+
+ if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
+ for (;;) {
+ get_random_bytes(&id, sizeof(cnid));
+ id &= 0x3fffffff;
+ str.name = name;
+ str.len = sprintf(name, "iNode%d", id);
+ res = hfsplus_rename_cat(inode->i_ino,
+ src_dir, &src_dentry->d_name,
+ HFSPLUS_SB(sb).hidden_dir, &str);
+ if (!res)
+ break;
+ if (res != -EEXIST)
+ return res;
+ }
+ HFSPLUS_I(inode).dev = id;
+ cnid = HFSPLUS_SB(sb).next_cnid++;
+ src_dentry->d_fsdata = (void *)(unsigned long)cnid;
+ res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
+ if (res)
+ /* panic? */
+ return res;
+ HFSPLUS_SB(sb).file_count++;
+ }
+ cnid = HFSPLUS_SB(sb).next_cnid++;
+ res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
+ if (res)
+ return res;
+
+ inode->i_nlink++;
+ hfsplus_instantiate(dst_dentry, inode, cnid);
+ atomic_inc(&inode->i_count);
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ HFSPLUS_SB(sb).file_count++;
+ sb->s_dirt = 1;
+
+ return 0;
+}
+
+static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct super_block *sb = dir->i_sb;
+ struct inode *inode = dentry->d_inode;
+ struct qstr str;
+ char name[32];
+ u32 cnid;
+ int res;
+
+ if (HFSPLUS_IS_RSRC(inode))
+ return -EPERM;
+
+ cnid = (u32)(unsigned long)dentry->d_fsdata;
+ if (inode->i_ino == cnid &&
+ atomic_read(&HFSPLUS_I(inode).opencnt)) {
+ str.name = name;
+ str.len = sprintf(name, "temp%lu", inode->i_ino);
+ res = hfsplus_rename_cat(inode->i_ino,
+ dir, &dentry->d_name,
+ HFSPLUS_SB(sb).hidden_dir, &str);
+ if (!res)
+ inode->i_flags |= S_DEAD;
+ return res;
+ }
+ res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
+ if (res)
+ return res;
+
+ inode->i_nlink--;
+ hfsplus_delete_inode(inode);
+ if (inode->i_ino != cnid && !inode->i_nlink) {
+ if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
+ res = hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
+ if (!res)
+ hfsplus_delete_inode(inode);
+ } else
+ inode->i_flags |= S_DEAD;
+ }
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+
+ return res;
+}
+
+static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ struct inode *inode;
+ int res;
+
+ inode = hfsplus_new_inode(dir->i_sb, S_IFDIR | mode);
+ if (!inode)
+ return -ENOSPC;
+
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res) {
+ inode->i_nlink = 0;
+ hfsplus_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode;
+ int res;
+
+ inode = dentry->d_inode;
+ if (inode->i_size != 2)
+ return -ENOTEMPTY;
+ res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
+ if (res)
+ return res;
+ inode->i_nlink = 0;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ hfsplus_delete_inode(inode);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct super_block *sb;
+ struct inode *inode;
+ int res;
+
+ sb = dir->i_sb;
+ inode = hfsplus_new_inode(sb, S_IFLNK | S_IRWXUGO);
+ if (!inode)
+ return -ENOSPC;
+
+ res = page_symlink(inode, symname, strlen(symname) + 1);
+ if (res) {
+ inode->i_nlink = 0;
+ hfsplus_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+
+ mark_inode_dirty(inode);
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+
+ if (!res) {
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+ }
+
+ return res;
+}
+
+static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t rdev)
+{
+ struct super_block *sb;
+ struct inode *inode;
+ int res;
+
+ sb = dir->i_sb;
+ inode = hfsplus_new_inode(sb, mode);
+ if (!inode)
+ return -ENOSPC;
+
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res) {
+ inode->i_nlink = 0;
+ hfsplus_delete_inode(inode);
+ iput(inode);
+ return res;
+ }
+ init_special_inode(inode, mode, rdev);
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+
+ return 0;
+}
+
+static int hfsplus_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 (new_dentry->d_inode) {
+ res = hfsplus_unlink(new_dir, new_dentry);
+ if (res)
+ return res;
+ }
+
+ res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
+ old_dir, &old_dentry->d_name,
+ new_dir, &new_dentry->d_name);
+ if (!res)
+ new_dentry->d_fsdata = old_dentry->d_fsdata;
+ return res;
+}
+
+struct inode_operations hfsplus_dir_inode_operations = {
+ .lookup = hfsplus_lookup,
+ .create = hfsplus_create,
+ .link = hfsplus_link,
+ .unlink = hfsplus_unlink,
+ .mkdir = hfsplus_mkdir,
+ .rmdir = hfsplus_rmdir,
+ .symlink = hfsplus_symlink,
+ .mknod = hfsplus_mknod,
+ .rename = hfsplus_rename,
+};
+
+struct file_operations hfsplus_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = hfsplus_readdir,
+ .ioctl = hfsplus_ioctl,
+ .llseek = generic_file_llseek,
+ .release = hfsplus_dir_release,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 22:17:36 +0000