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583 lines
14 KiB
583 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* linux/fs/hfsplus/dir.c |
|
* |
|
* Copyright (C) 2001 |
|
* Brad Boyer ([email protected]) |
|
* (C) 2003 Ardis Technologies <[email protected]> |
|
* |
|
* 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 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, |
|
};
|
|
|