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-rw-r--r--fs/hfsplus/dir.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
new file mode 100644
index 000000000..f37662675
--- /dev/null
+++ b/fs/hfsplus/dir.c
@@ -0,0 +1,578 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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/slab.h>
+#include <linux/random.h>
+#include <linux/nls.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+#include "xattr.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,
+ unsigned int flags)
+{
+ 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;
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return ERR_PTR(err);
+ err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
+ &dentry->d_name);
+ if (unlikely(err < 0))
+ goto fail;
+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) &&
+ HFSPLUS_SB(sb)->hidden_dir &&
+ (entry.file.create_date ==
+ HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
+ create_date ||
+ entry.file.create_date ==
+ HFSPLUS_I(d_inode(sb->s_root))->
+ create_date)) {
+ struct qstr str;
+ char name[32];
+
+ if (dentry->d_fsdata) {
+ /*
+ * We found a link pointing to another link,
+ * so ignore it and treat it as regular file.
+ */
+ cnid = (unsigned long)dentry->d_fsdata;
+ linkid = 0;
+ } else {
+ 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;
+ err = hfsplus_cat_build_key(sb, fd.search_key,
+ HFSPLUS_SB(sb)->hidden_dir->i_ino,
+ &str);
+ if (unlikely(err < 0))
+ goto fail;
+ goto again;
+ }
+ } else if (!dentry->d_fsdata)
+ dentry->d_fsdata = (void *)(unsigned long)cnid;
+ } else {
+ pr_err("invalid catalog entry type in lookup\n");
+ err = -EIO;
+ goto fail;
+ }
+ hfs_find_exit(&fd);
+ inode = hfsplus_iget(dir->i_sb, cnid);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (S_ISREG(inode->i_mode))
+ HFSPLUS_I(inode)->linkid = linkid;
+out:
+ return d_splice_alias(inode, dentry);
+fail:
+ hfs_find_exit(&fd);
+ return ERR_PTR(err);
+}
+
+static int hfsplus_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;
+ hfsplus_cat_entry entry;
+ struct hfs_find_data fd;
+ struct hfsplus_readdir_data *rd;
+ u16 type;
+
+ if (file->f_pos >= inode->i_size)
+ return 0;
+
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return err;
+ strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
+ if (!strbuf) {
+ err = -ENOMEM;
+ goto out;
+ }
+ hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
+ err = hfs_brec_find(&fd, hfs_find_rec_by_key);
+ 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 (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
+ pr_err("bad catalog folder thread\n");
+ err = -EIO;
+ goto out;
+ }
+ if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
+ pr_err("truncated catalog thread\n");
+ err = -EIO;
+ goto out;
+ }
+ if (!dir_emit(ctx, "..", 2,
+ be32_to_cpu(entry.thread.parentID), 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.parent) != 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 = be16_to_cpu(entry.type);
+ len = NLS_MAX_CHARSET_SIZE * 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)) {
+ pr_err("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 (!dir_emit(ctx, strbuf, len,
+ be32_to_cpu(entry.folder.id), DT_DIR))
+ break;
+ } else if (type == HFSPLUS_FILE) {
+ u16 mode;
+ unsigned type = DT_UNKNOWN;
+
+ if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
+ pr_err("small file entry\n");
+ err = -EIO;
+ goto out;
+ }
+
+ mode = be16_to_cpu(entry.file.permissions.mode);
+ if (S_ISREG(mode))
+ type = DT_REG;
+ else if (S_ISLNK(mode))
+ type = DT_LNK;
+ else if (S_ISFIFO(mode))
+ type = DT_FIFO;
+ else if (S_ISCHR(mode))
+ type = DT_CHR;
+ else if (S_ISBLK(mode))
+ type = DT_BLK;
+ else if (S_ISSOCK(mode))
+ type = DT_SOCK;
+
+ if (!dir_emit(ctx, strbuf, len,
+ be32_to_cpu(entry.file.id), type))
+ break;
+ } else {
+ pr_err("bad catalog entry type\n");
+ err = -EIO;
+ goto out;
+ }
+next:
+ 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 hfsplus_readdir_data), GFP_KERNEL);
+ if (!rd) {
+ err = -ENOMEM;
+ goto out;
+ }
+ file->private_data = rd;
+ rd->file = file;
+ spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
+ list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
+ spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
+ }
+ /*
+ * Can be done after the list insertion; exclusion with
+ * hfsplus_delete_cat() is provided by directory lock.
+ */
+ memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
+out:
+ kfree(strbuf);
+ 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) {
+ spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
+ list_del(&rd->list);
+ spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
+ kfree(rd);
+ }
+ return 0;
+}
+
+static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
+ struct dentry *dst_dentry)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
+ struct inode *inode = d_inode(src_dentry);
+ struct inode *src_dir = d_inode(src_dentry->d_parent);
+ struct qstr str;
+ char name[32];
+ u32 cnid, id;
+ int res;
+
+ if (HFSPLUS_IS_RSRC(inode))
+ return -EPERM;
+ if (!S_ISREG(inode->i_mode))
+ return -EPERM;
+
+ mutex_lock(&sbi->vh_mutex);
+ 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,
+ sbi->hidden_dir, &str);
+ if (!res)
+ break;
+ if (res != -EEXIST)
+ goto out;
+ }
+ HFSPLUS_I(inode)->linkid = id;
+ cnid = sbi->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? */
+ goto out;
+ sbi->file_count++;
+ }
+ cnid = sbi->next_cnid++;
+ res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
+ if (res)
+ goto out;
+
+ inc_nlink(inode);
+ hfsplus_instantiate(dst_dentry, inode, cnid);
+ ihold(inode);
+ inode->i_ctime = current_time(inode);
+ mark_inode_dirty(inode);
+ sbi->file_count++;
+ hfsplus_mark_mdb_dirty(dst_dir->i_sb);
+out:
+ mutex_unlock(&sbi->vh_mutex);
+ return res;
+}
+
+static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
+ struct inode *inode = d_inode(dentry);
+ struct qstr str;
+ char name[32];
+ u32 cnid;
+ int res;
+
+ if (HFSPLUS_IS_RSRC(inode))
+ return -EPERM;
+
+ mutex_lock(&sbi->vh_mutex);
+ 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,
+ sbi->hidden_dir, &str);
+ if (!res) {
+ inode->i_flags |= S_DEAD;
+ drop_nlink(inode);
+ }
+ goto out;
+ }
+ res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
+ if (res)
+ goto out;
+
+ if (inode->i_nlink > 0)
+ drop_nlink(inode);
+ if (inode->i_ino == cnid)
+ clear_nlink(inode);
+ if (!inode->i_nlink) {
+ if (inode->i_ino != cnid) {
+ sbi->file_count--;
+ if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
+ res = hfsplus_delete_cat(inode->i_ino,
+ sbi->hidden_dir,
+ NULL);
+ if (!res)
+ hfsplus_delete_inode(inode);
+ } else
+ inode->i_flags |= S_DEAD;
+ } else
+ hfsplus_delete_inode(inode);
+ } else
+ sbi->file_count--;
+ inode->i_ctime = current_time(inode);
+ mark_inode_dirty(inode);
+out:
+ mutex_unlock(&sbi->vh_mutex);
+ return res;
+}
+
+static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
+ struct inode *inode = d_inode(dentry);
+ int res;
+
+ if (inode->i_size != 2)
+ return -ENOTEMPTY;
+
+ mutex_lock(&sbi->vh_mutex);
+ res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
+ if (res)
+ goto out;
+ clear_nlink(inode);
+ inode->i_ctime = current_time(inode);
+ hfsplus_delete_inode(inode);
+ mark_inode_dirty(inode);
+out:
+ mutex_unlock(&sbi->vh_mutex);
+ return res;
+}
+
+static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
+ struct inode *inode;
+ int res = -ENOMEM;
+
+ mutex_lock(&sbi->vh_mutex);
+ inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO);
+ if (!inode)
+ goto out;
+
+ res = page_symlink(inode, symname, strlen(symname) + 1);
+ if (res)
+ goto out_err;
+
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res)
+ goto out_err;
+
+ res = hfsplus_init_security(inode, dir, &dentry->d_name);
+ if (res == -EOPNOTSUPP)
+ res = 0; /* Operation is not supported. */
+ else if (res) {
+ /* Try to delete anyway without error analysis. */
+ hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
+ goto out_err;
+ }
+
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+ goto out;
+
+out_err:
+ clear_nlink(inode);
+ hfsplus_delete_inode(inode);
+ iput(inode);
+out:
+ mutex_unlock(&sbi->vh_mutex);
+ return res;
+}
+
+static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
+ umode_t mode, dev_t rdev)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
+ struct inode *inode;
+ int res = -ENOMEM;
+
+ mutex_lock(&sbi->vh_mutex);
+ inode = hfsplus_new_inode(dir->i_sb, dir, mode);
+ if (!inode)
+ goto out;
+
+ if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
+ init_special_inode(inode, mode, rdev);
+
+ res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
+ if (res)
+ goto failed_mknod;
+
+ res = hfsplus_init_security(inode, dir, &dentry->d_name);
+ if (res == -EOPNOTSUPP)
+ res = 0; /* Operation is not supported. */
+ else if (res) {
+ /* Try to delete anyway without error analysis. */
+ hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
+ goto failed_mknod;
+ }
+
+ hfsplus_instantiate(dentry, inode, inode->i_ino);
+ mark_inode_dirty(inode);
+ goto out;
+
+failed_mknod:
+ clear_nlink(inode);
+ hfsplus_delete_inode(inode);
+ iput(inode);
+out:
+ mutex_unlock(&sbi->vh_mutex);
+ return res;
+}
+
+static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool excl)
+{
+ return hfsplus_mknod(dir, dentry, mode, 0);
+}
+
+static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
+}
+
+static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ int res;
+
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
+ /* Unlink destination if it already exists */
+ if (d_really_is_positive(new_dentry)) {
+ if (d_is_dir(new_dentry))
+ res = hfsplus_rmdir(new_dir, new_dentry);
+ else
+ 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;
+}
+
+const 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,
+ .listxattr = hfsplus_listxattr,
+};
+
+const struct file_operations hfsplus_dir_operations = {
+ .fsync = hfsplus_file_fsync,
+ .read = generic_read_dir,
+ .iterate_shared = hfsplus_readdir,
+ .unlocked_ioctl = hfsplus_ioctl,
+ .llseek = generic_file_llseek,
+ .release = hfsplus_dir_release,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 19:37:10 +0000