From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/hfsplus/dir.c | 583 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 583 insertions(+) create mode 100644 fs/hfsplus/dir.c (limited to 'fs/hfsplus/dir.c') diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c new file mode 100644 index 000000000..84714bbcc --- /dev/null +++ b/fs/hfsplus/dir.c @@ -0,0 +1,583 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/hfsplus/dir.c + * + * Copyright (C) 2001 + * Brad Boyer (flar@allandria.com) + * (C) 2003 Ardis Technologies + * + * Handling of directories + */ + +#include +#include +#include +#include +#include + +#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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, bool excl) +{ + return hfsplus_mknod(&init_user_ns, dir, dentry, mode, 0); +} + +static int hfsplus_mkdir(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode) +{ + return hfsplus_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0); +} + +static int hfsplus_rename(struct user_namespace *mnt_userns, + 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, + .getattr = hfsplus_getattr, + .listxattr = hfsplus_listxattr, + .fileattr_get = hfsplus_fileattr_get, + .fileattr_set = hfsplus_fileattr_set, +}; + +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, +}; -- cgit v1.2.3