linux/fs/hfsplus/inode.c
Ernesto A. Fernández f168d9fd63 hfsplus: drop ACL support
The HFS+ Access Control Lists have not worked at all for the past five
years, and nobody seems to have noticed.  Besides, POSIX draft ACLs are
not compatible with MacOS.  Drop the feature entirely.

Link: http://lkml.kernel.org/r/20180714190608.wtnmmtjqeyladkut@eaf
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Viacheslav Dubeyko <slava@dubeyko.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-22 10:52:50 -07:00

607 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/hfsplus/inode.c
*
* Copyright (C) 2001
* Brad Boyer (flar@allandria.com)
* (C) 2003 Ardis Technologies <roman@ardistech.com>
*
* Inode handling routines
*/
#include <linux/blkdev.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/uio.h>
#include "hfsplus_fs.h"
#include "hfsplus_raw.h"
#include "xattr.h"
static int hfsplus_readpage(struct file *file, struct page *page)
{
return block_read_full_page(page, hfsplus_get_block);
}
static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page, hfsplus_get_block, wbc);
}
static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
{
struct inode *inode = mapping->host;
if (to > inode->i_size) {
truncate_pagecache(inode, inode->i_size);
hfsplus_file_truncate(inode);
}
}
static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
int ret;
*pagep = NULL;
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
hfsplus_get_block,
&HFSPLUS_I(mapping->host)->phys_size);
if (unlikely(ret))
hfsplus_write_failed(mapping, pos + len);
return ret;
}
static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping, block, hfsplus_get_block);
}
static int hfsplus_releasepage(struct page *page, gfp_t mask)
{
struct inode *inode = page->mapping->host;
struct super_block *sb = inode->i_sb;
struct hfs_btree *tree;
struct hfs_bnode *node;
u32 nidx;
int i, res = 1;
switch (inode->i_ino) {
case HFSPLUS_EXT_CNID:
tree = HFSPLUS_SB(sb)->ext_tree;
break;
case HFSPLUS_CAT_CNID:
tree = HFSPLUS_SB(sb)->cat_tree;
break;
case HFSPLUS_ATTR_CNID:
tree = HFSPLUS_SB(sb)->attr_tree;
break;
default:
BUG();
return 0;
}
if (!tree)
return 0;
if (tree->node_size >= PAGE_SIZE) {
nidx = page->index >>
(tree->node_size_shift - PAGE_SHIFT);
spin_lock(&tree->hash_lock);
node = hfs_bnode_findhash(tree, nidx);
if (!node)
;
else if (atomic_read(&node->refcnt))
res = 0;
if (res && node) {
hfs_bnode_unhash(node);
hfs_bnode_free(node);
}
spin_unlock(&tree->hash_lock);
} else {
nidx = page->index <<
(PAGE_SHIFT - tree->node_size_shift);
i = 1 << (PAGE_SHIFT - tree->node_size_shift);
spin_lock(&tree->hash_lock);
do {
node = hfs_bnode_findhash(tree, nidx++);
if (!node)
continue;
if (atomic_read(&node->refcnt)) {
res = 0;
break;
}
hfs_bnode_unhash(node);
hfs_bnode_free(node);
} while (--i && nidx < tree->node_count);
spin_unlock(&tree->hash_lock);
}
return res ? try_to_free_buffers(page) : 0;
}
static ssize_t hfsplus_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_iter_count(iter);
ssize_t ret;
ret = blockdev_direct_IO(iocb, inode, iter, hfsplus_get_block);
/*
* In case of error extending write may have instantiated a few
* blocks outside i_size. Trim these off again.
*/
if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
loff_t isize = i_size_read(inode);
loff_t end = iocb->ki_pos + count;
if (end > isize)
hfsplus_write_failed(mapping, end);
}
return ret;
}
static int hfsplus_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
return mpage_writepages(mapping, wbc, hfsplus_get_block);
}
const struct address_space_operations hfsplus_btree_aops = {
.readpage = hfsplus_readpage,
.writepage = hfsplus_writepage,
.write_begin = hfsplus_write_begin,
.write_end = generic_write_end,
.bmap = hfsplus_bmap,
.releasepage = hfsplus_releasepage,
};
const struct address_space_operations hfsplus_aops = {
.readpage = hfsplus_readpage,
.writepage = hfsplus_writepage,
.write_begin = hfsplus_write_begin,
.write_end = generic_write_end,
.bmap = hfsplus_bmap,
.direct_IO = hfsplus_direct_IO,
.writepages = hfsplus_writepages,
};
const struct dentry_operations hfsplus_dentry_operations = {
.d_hash = hfsplus_hash_dentry,
.d_compare = hfsplus_compare_dentry,
};
static void hfsplus_get_perms(struct inode *inode,
struct hfsplus_perm *perms, int dir)
{
struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
u16 mode;
mode = be16_to_cpu(perms->mode);
i_uid_write(inode, be32_to_cpu(perms->owner));
if (!i_uid_read(inode) && !mode)
inode->i_uid = sbi->uid;
i_gid_write(inode, be32_to_cpu(perms->group));
if (!i_gid_read(inode) && !mode)
inode->i_gid = sbi->gid;
if (dir) {
mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
mode |= S_IFDIR;
} else if (!mode)
mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
inode->i_mode = mode;
HFSPLUS_I(inode)->userflags = perms->userflags;
if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
inode->i_flags |= S_IMMUTABLE;
else
inode->i_flags &= ~S_IMMUTABLE;
if (perms->rootflags & HFSPLUS_FLG_APPEND)
inode->i_flags |= S_APPEND;
else
inode->i_flags &= ~S_APPEND;
}
static int hfsplus_file_open(struct inode *inode, struct file *file)
{
if (HFSPLUS_IS_RSRC(inode))
inode = HFSPLUS_I(inode)->rsrc_inode;
if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
return -EOVERFLOW;
atomic_inc(&HFSPLUS_I(inode)->opencnt);
return 0;
}
static int hfsplus_file_release(struct inode *inode, struct file *file)
{
struct super_block *sb = inode->i_sb;
if (HFSPLUS_IS_RSRC(inode))
inode = HFSPLUS_I(inode)->rsrc_inode;
if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
inode_lock(inode);
hfsplus_file_truncate(inode);
if (inode->i_flags & S_DEAD) {
hfsplus_delete_cat(inode->i_ino,
HFSPLUS_SB(sb)->hidden_dir, NULL);
hfsplus_delete_inode(inode);
}
inode_unlock(inode);
}
return 0;
}
static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
int error;
error = setattr_prepare(dentry, attr);
if (error)
return error;
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size != i_size_read(inode)) {
inode_dio_wait(inode);
if (attr->ia_size > inode->i_size) {
error = generic_cont_expand_simple(inode,
attr->ia_size);
if (error)
return error;
}
truncate_setsize(inode, attr->ia_size);
hfsplus_file_truncate(inode);
}
setattr_copy(inode, attr);
mark_inode_dirty(inode);
return 0;
}
int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
int datasync)
{
struct inode *inode = file->f_mapping->host;
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
int error = 0, error2;
error = file_write_and_wait_range(file, start, end);
if (error)
return error;
inode_lock(inode);
/*
* Sync inode metadata into the catalog and extent trees.
*/
sync_inode_metadata(inode, 1);
/*
* And explicitly write out the btrees.
*/
if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
error2 =
filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
if (!error)
error = error2;
}
if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
if (sbi->attr_tree) {
error2 =
filemap_write_and_wait(
sbi->attr_tree->inode->i_mapping);
if (!error)
error = error2;
} else {
pr_err("sync non-existent attributes tree\n");
}
}
if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
if (!error)
error = error2;
}
if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
inode_unlock(inode);
return error;
}
static const struct inode_operations hfsplus_file_inode_operations = {
.setattr = hfsplus_setattr,
.listxattr = hfsplus_listxattr,
};
static const struct file_operations hfsplus_file_operations = {
.llseek = generic_file_llseek,
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
.mmap = generic_file_mmap,
.splice_read = generic_file_splice_read,
.fsync = hfsplus_file_fsync,
.open = hfsplus_file_open,
.release = hfsplus_file_release,
.unlocked_ioctl = hfsplus_ioctl,
};
struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
umode_t mode)
{
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
struct inode *inode = new_inode(sb);
struct hfsplus_inode_info *hip;
if (!inode)
return NULL;
inode->i_ino = sbi->next_cnid++;
inode_init_owner(inode, dir, mode);
set_nlink(inode, 1);
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
hip = HFSPLUS_I(inode);
INIT_LIST_HEAD(&hip->open_dir_list);
spin_lock_init(&hip->open_dir_lock);
mutex_init(&hip->extents_lock);
atomic_set(&hip->opencnt, 0);
hip->extent_state = 0;
hip->flags = 0;
hip->userflags = 0;
hip->subfolders = 0;
memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
hip->alloc_blocks = 0;
hip->first_blocks = 0;
hip->cached_start = 0;
hip->cached_blocks = 0;
hip->phys_size = 0;
hip->fs_blocks = 0;
hip->rsrc_inode = NULL;
if (S_ISDIR(inode->i_mode)) {
inode->i_size = 2;
sbi->folder_count++;
inode->i_op = &hfsplus_dir_inode_operations;
inode->i_fop = &hfsplus_dir_operations;
} else if (S_ISREG(inode->i_mode)) {
sbi->file_count++;
inode->i_op = &hfsplus_file_inode_operations;
inode->i_fop = &hfsplus_file_operations;
inode->i_mapping->a_ops = &hfsplus_aops;
hip->clump_blocks = sbi->data_clump_blocks;
} else if (S_ISLNK(inode->i_mode)) {
sbi->file_count++;
inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &hfsplus_aops;
hip->clump_blocks = 1;
} else
sbi->file_count++;
insert_inode_hash(inode);
mark_inode_dirty(inode);
hfsplus_mark_mdb_dirty(sb);
return inode;
}
void hfsplus_delete_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
if (S_ISDIR(inode->i_mode)) {
HFSPLUS_SB(sb)->folder_count--;
hfsplus_mark_mdb_dirty(sb);
return;
}
HFSPLUS_SB(sb)->file_count--;
if (S_ISREG(inode->i_mode)) {
if (!inode->i_nlink) {
inode->i_size = 0;
hfsplus_file_truncate(inode);
}
} else if (S_ISLNK(inode->i_mode)) {
inode->i_size = 0;
hfsplus_file_truncate(inode);
}
hfsplus_mark_mdb_dirty(sb);
}
void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
{
struct super_block *sb = inode->i_sb;
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
u32 count;
int i;
memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
for (count = 0, i = 0; i < 8; i++)
count += be32_to_cpu(fork->extents[i].block_count);
hip->first_blocks = count;
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
hip->cached_start = 0;
hip->cached_blocks = 0;
hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
hip->fs_blocks =
(inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
hip->clump_blocks =
be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
if (!hip->clump_blocks) {
hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
sbi->rsrc_clump_blocks :
sbi->data_clump_blocks;
}
}
void hfsplus_inode_write_fork(struct inode *inode,
struct hfsplus_fork_raw *fork)
{
memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
sizeof(hfsplus_extent_rec));
fork->total_size = cpu_to_be64(inode->i_size);
fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
}
int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
{
hfsplus_cat_entry entry;
int res = 0;
u16 type;
type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
HFSPLUS_I(inode)->linkid = 0;
if (type == HFSPLUS_FOLDER) {
struct hfsplus_cat_folder *folder = &entry.folder;
if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
/* panic? */;
hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
sizeof(struct hfsplus_cat_folder));
hfsplus_get_perms(inode, &folder->permissions, 1);
set_nlink(inode, 1);
inode->i_size = 2 + be32_to_cpu(folder->valence);
inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(folder->access_date));
inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(folder->content_mod_date));
inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(folder->attribute_mod_date));
HFSPLUS_I(inode)->create_date = folder->create_date;
HFSPLUS_I(inode)->fs_blocks = 0;
if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
HFSPLUS_I(inode)->subfolders =
be32_to_cpu(folder->subfolders);
}
inode->i_op = &hfsplus_dir_inode_operations;
inode->i_fop = &hfsplus_dir_operations;
} else if (type == HFSPLUS_FILE) {
struct hfsplus_cat_file *file = &entry.file;
if (fd->entrylength < sizeof(struct hfsplus_cat_file))
/* panic? */;
hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
sizeof(struct hfsplus_cat_file));
hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
&file->rsrc_fork : &file->data_fork);
hfsplus_get_perms(inode, &file->permissions, 0);
set_nlink(inode, 1);
if (S_ISREG(inode->i_mode)) {
if (file->permissions.dev)
set_nlink(inode,
be32_to_cpu(file->permissions.dev));
inode->i_op = &hfsplus_file_inode_operations;
inode->i_fop = &hfsplus_file_operations;
inode->i_mapping->a_ops = &hfsplus_aops;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &hfsplus_aops;
} else {
init_special_inode(inode, inode->i_mode,
be32_to_cpu(file->permissions.dev));
}
inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(file->access_date));
inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(file->content_mod_date));
inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(file->attribute_mod_date));
HFSPLUS_I(inode)->create_date = file->create_date;
} else {
pr_err("bad catalog entry used to create inode\n");
res = -EIO;
}
return res;
}
int hfsplus_cat_write_inode(struct inode *inode)
{
struct inode *main_inode = inode;
struct hfs_find_data fd;
hfsplus_cat_entry entry;
if (HFSPLUS_IS_RSRC(inode))
main_inode = HFSPLUS_I(inode)->rsrc_inode;
if (!main_inode->i_nlink)
return 0;
if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
/* panic? */
return -EIO;
if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
/* panic? */
goto out;
if (S_ISDIR(main_inode->i_mode)) {
struct hfsplus_cat_folder *folder = &entry.folder;
if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
/* panic? */;
hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_folder));
/* simple node checks? */
hfsplus_cat_set_perms(inode, &folder->permissions);
folder->access_date = hfsp_ut2mt(inode->i_atime);
folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
folder->valence = cpu_to_be32(inode->i_size - 2);
if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
folder->subfolders =
cpu_to_be32(HFSPLUS_I(inode)->subfolders);
}
hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_folder));
} else if (HFSPLUS_IS_RSRC(inode)) {
struct hfsplus_cat_file *file = &entry.file;
hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_file));
hfsplus_inode_write_fork(inode, &file->rsrc_fork);
hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_file));
} else {
struct hfsplus_cat_file *file = &entry.file;
if (fd.entrylength < sizeof(struct hfsplus_cat_file))
/* panic? */;
hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_file));
hfsplus_inode_write_fork(inode, &file->data_fork);
hfsplus_cat_set_perms(inode, &file->permissions);
if (HFSPLUS_FLG_IMMUTABLE &
(file->permissions.rootflags |
file->permissions.userflags))
file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
else
file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
file->access_date = hfsp_ut2mt(inode->i_atime);
file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
sizeof(struct hfsplus_cat_file));
}
set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
out:
hfs_find_exit(&fd);
return 0;
}