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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/hfsplus/inode.c

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15 KiB
C
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/*
* 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/mm.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/sched.h>
#include "hfsplus_fs.h"
#include "hfsplus_raw.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 int hfsplus_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
hfsplus_get_block,
&HFSPLUS_I(mapping->host).phys_size);
}
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_CACHE_SIZE) {
nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_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_CACHE_SHIFT - tree->node_size_shift);
i = 1 << (PAGE_CACHE_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(int rw, struct kiocb *iocb,
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs, hfsplus_get_block, NULL);
}
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,
.sync_page = block_sync_page,
.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,
.sync_page = block_sync_page,
.write_begin = hfsplus_write_begin,
.write_end = generic_write_end,
.bmap = hfsplus_bmap,
.direct_IO = hfsplus_direct_IO,
.writepages = hfsplus_writepages,
};
struct dentry_operations hfsplus_dentry_operations = {
.d_hash = hfsplus_hash_dentry,
.d_compare = hfsplus_compare_dentry,
};
static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct hfs_find_data fd;
struct super_block *sb = dir->i_sb;
struct inode *inode = NULL;
int err;
if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
goto out;
inode = HFSPLUS_I(dir).rsrc_inode;
if (inode)
goto out;
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = dir->i_ino;
INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
mutex_init(&HFSPLUS_I(inode).extents_lock);
HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
err = hfsplus_find_cat(sb, dir->i_ino, &fd);
if (!err)
err = hfsplus_cat_read_inode(inode, &fd);
hfs_find_exit(&fd);
if (err) {
iput(inode);
return ERR_PTR(err);
}
HFSPLUS_I(inode).rsrc_inode = dir;
HFSPLUS_I(dir).rsrc_inode = inode;
igrab(dir);
hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
mark_inode_dirty(inode);
out:
d_add(dentry, inode);
return NULL;
}
static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
{
struct super_block *sb = inode->i_sb;
u16 mode;
mode = be16_to_cpu(perms->mode);
inode->i_uid = be32_to_cpu(perms->owner);
if (!inode->i_uid && !mode)
inode->i_uid = HFSPLUS_SB(sb).uid;
inode->i_gid = be32_to_cpu(perms->group);
if (!inode->i_gid && !mode)
inode->i_gid = HFSPLUS_SB(sb).gid;
if (dir) {
mode = mode ? (mode & S_IALLUGO) :
(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
mode |= S_IFDIR;
} else if (!mode)
mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
~(HFSPLUS_SB(sb).umask));
inode->i_mode = mode;
HFSPLUS_I(inode).rootflags = perms->rootflags;
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 void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
{
if (inode->i_flags & S_IMMUTABLE)
perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
else
perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
if (inode->i_flags & S_APPEND)
perms->rootflags |= HFSPLUS_FLG_APPEND;
else
perms->rootflags &= ~HFSPLUS_FLG_APPEND;
perms->userflags = HFSPLUS_I(inode).userflags;
perms->mode = cpu_to_be16(inode->i_mode);
perms->owner = cpu_to_be32(inode->i_uid);
perms->group = cpu_to_be32(inode->i_gid);
perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
}
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)) {
mutex_lock(&inode->i_mutex);
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);
}
mutex_unlock(&inode->i_mutex);
}
return 0;
}
static const struct inode_operations hfsplus_file_inode_operations = {
.lookup = hfsplus_file_lookup,
.truncate = hfsplus_file_truncate,
.setxattr = hfsplus_setxattr,
.getxattr = hfsplus_getxattr,
.listxattr = hfsplus_listxattr,
};
static const struct file_operations hfsplus_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.splice_read = generic_file_splice_read,
.fsync = file_fsync,
.open = hfsplus_file_open,
.release = hfsplus_file_release,
.ioctl = hfsplus_ioctl,
};
struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
{
struct inode *inode = new_inode(sb);
if (!inode)
return NULL;
inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
mutex_init(&HFSPLUS_I(inode).extents_lock);
atomic_set(&HFSPLUS_I(inode).opencnt, 0);
HFSPLUS_I(inode).flags = 0;
memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
HFSPLUS_I(inode).alloc_blocks = 0;
HFSPLUS_I(inode).first_blocks = 0;
HFSPLUS_I(inode).cached_start = 0;
HFSPLUS_I(inode).cached_blocks = 0;
HFSPLUS_I(inode).phys_size = 0;
HFSPLUS_I(inode).fs_blocks = 0;
HFSPLUS_I(inode).rsrc_inode = NULL;
if (S_ISDIR(inode->i_mode)) {
inode->i_size = 2;
HFSPLUS_SB(sb).folder_count++;
inode->i_op = &hfsplus_dir_inode_operations;
inode->i_fop = &hfsplus_dir_operations;
} else if (S_ISREG(inode->i_mode)) {
HFSPLUS_SB(sb).file_count++;
inode->i_op = &hfsplus_file_inode_operations;
inode->i_fop = &hfsplus_file_operations;
inode->i_mapping->a_ops = &hfsplus_aops;
HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
} else if (S_ISLNK(inode->i_mode)) {
HFSPLUS_SB(sb).file_count++;
inode->i_op = &page_symlink_inode_operations;
inode->i_mapping->a_ops = &hfsplus_aops;
HFSPLUS_I(inode).clump_blocks = 1;
} else
HFSPLUS_SB(sb).file_count++;
insert_inode_hash(inode);
mark_inode_dirty(inode);
sb->s_dirt = 1;
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--;
sb->s_dirt = 1;
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);
}
sb->s_dirt = 1;
}
void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
{
struct super_block *sb = inode->i_sb;
u32 count;
int i;
memcpy(&HFSPLUS_I(inode).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);
HFSPLUS_I(inode).first_blocks = count;
memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
HFSPLUS_I(inode).cached_start = 0;
HFSPLUS_I(inode).cached_blocks = 0;
HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
if (!HFSPLUS_I(inode).clump_blocks)
HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
HFSPLUS_SB(sb).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).dev = 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);
inode->i_nlink = 1;
inode->i_size = 2 + be32_to_cpu(folder->valence);
inode->i_atime = hfsp_mt2ut(folder->access_date);
inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
HFSPLUS_I(inode).create_date = folder->create_date;
HFSPLUS_I(inode).fs_blocks = 0;
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_DATA(inode) ?
&file->data_fork : &file->rsrc_fork);
hfsplus_get_perms(inode, &file->permissions, 0);
inode->i_nlink = 1;
if (S_ISREG(inode->i_mode)) {
if (file->permissions.dev)
inode->i_nlink = 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->i_mapping->a_ops = &hfsplus_aops;
} else {
init_special_inode(inode, inode->i_mode,
be32_to_cpu(file->permissions.dev));
}
inode->i_atime = hfsp_mt2ut(file->access_date);
inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
HFSPLUS_I(inode).create_date = file->create_date;
} else {
printk(KERN_ERR "hfs: 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_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);
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);
if (S_ISREG(inode->i_mode))
HFSPLUS_I(inode).dev = inode->i_nlink;
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
hfsplus_set_perms(inode, &file->permissions);
if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
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));
}
out:
hfs_find_exit(&fd);
return 0;
}
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