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linux-sg2042/fs/hfsplus/super.c

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/*
* linux/fs/hfsplus/super.c
*
* Copyright (C) 2001
* Brad Boyer (flar@allandria.com)
* (C) 2003 Ardis Technologies <roman@ardistech.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <linux/vfs.h>
#include <linux/nls.h>
static struct inode *hfsplus_alloc_inode(struct super_block *sb);
static void hfsplus_destroy_inode(struct inode *inode);
#include "hfsplus_fs.h"
void hfsplus_inode_check(struct super_block *sb)
{
#if 0
u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
if (cnt <= (last_cnt / 2) ||
cnt >= (last_cnt * 2)) {
HFSPLUS_SB(sb).last_inode_cnt = cnt;
printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
}
#endif
}
static void hfsplus_read_inode(struct inode *inode)
{
struct hfs_find_data fd;
struct hfsplus_vh *vhdr;
int err;
atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
hfsplus_inode_check(inode->i_sb);
INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
init_MUTEX(&HFSPLUS_I(inode).extents_lock);
HFSPLUS_I(inode).flags = 0;
HFSPLUS_I(inode).rsrc_inode = NULL;
if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
read_inode:
hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
if (!err)
err = hfsplus_cat_read_inode(inode, &fd);
hfs_find_exit(&fd);
if (err)
goto bad_inode;
return;
}
vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
switch(inode->i_ino) {
case HFSPLUS_ROOT_CNID:
goto read_inode;
case HFSPLUS_EXT_CNID:
hfsplus_inode_read_fork(inode, &vhdr->ext_file);
inode->i_mapping->a_ops = &hfsplus_btree_aops;
break;
case HFSPLUS_CAT_CNID:
hfsplus_inode_read_fork(inode, &vhdr->cat_file);
inode->i_mapping->a_ops = &hfsplus_btree_aops;
break;
case HFSPLUS_ALLOC_CNID:
hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
inode->i_mapping->a_ops = &hfsplus_aops;
break;
case HFSPLUS_START_CNID:
hfsplus_inode_read_fork(inode, &vhdr->start_file);
break;
case HFSPLUS_ATTR_CNID:
hfsplus_inode_read_fork(inode, &vhdr->attr_file);
inode->i_mapping->a_ops = &hfsplus_btree_aops;
break;
default:
goto bad_inode;
}
return;
bad_inode:
make_bad_inode(inode);
}
static int hfsplus_write_inode(struct inode *inode, int unused)
{
struct hfsplus_vh *vhdr;
int ret = 0;
dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
hfsplus_ext_write_extent(inode);
if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
return hfsplus_cat_write_inode(inode);
}
vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
switch (inode->i_ino) {
case HFSPLUS_ROOT_CNID:
ret = hfsplus_cat_write_inode(inode);
break;
case HFSPLUS_EXT_CNID:
if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, &vhdr->ext_file);
hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
break;
case HFSPLUS_CAT_CNID:
if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, &vhdr->cat_file);
hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
break;
case HFSPLUS_ALLOC_CNID:
if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
break;
case HFSPLUS_START_CNID:
if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, &vhdr->start_file);
break;
case HFSPLUS_ATTR_CNID:
if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, &vhdr->attr_file);
hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
break;
}
return ret;
}
static void hfsplus_clear_inode(struct inode *inode)
{
dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
if (HFSPLUS_IS_RSRC(inode)) {
HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
iput(HFSPLUS_I(inode).rsrc_inode);
}
hfsplus_inode_check(inode->i_sb);
}
static void hfsplus_write_super(struct super_block *sb)
{
struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
dprint(DBG_SUPER, "hfsplus_write_super\n");
sb->s_dirt = 0;
if (sb->s_flags & MS_RDONLY)
/* warn? */
return;
vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
if (HFSPLUS_SB(sb).sect_count) {
struct buffer_head *bh;
u32 block, offset;
block = HFSPLUS_SB(sb).blockoffset;
block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
HFSPLUS_SB(sb).sect_count, block, offset);
bh = sb_bread(sb, block);
if (bh) {
vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
mark_buffer_dirty(bh);
brelse(bh);
} else
printk("backup not found!\n");
}
}
HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
}
}
static void hfsplus_put_super(struct super_block *sb)
{
dprint(DBG_SUPER, "hfsplus_put_super\n");
if (!(sb->s_flags & MS_RDONLY)) {
struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
vhdr->modify_date = hfsp_now2mt();
vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
}
hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
iput(HFSPLUS_SB(sb).alloc_file);
iput(HFSPLUS_SB(sb).hidden_dir);
brelse(HFSPLUS_SB(sb).s_vhbh);
if (HFSPLUS_SB(sb).nls)
unload_nls(HFSPLUS_SB(sb).nls);
}
static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
{
buf->f_type = HFSPLUS_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
buf->f_bavail = buf->f_bfree;
buf->f_files = 0xFFFFFFFF;
buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
buf->f_namelen = HFSPLUS_MAX_STRLEN;
return 0;
}
static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
{
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
if (!(*flags & MS_RDONLY)) {
struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
"running fsck.hfsplus is recommended. leaving read-only.\n");
sb->s_flags |= MS_RDONLY;
*flags |= MS_RDONLY;
} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
sb->s_flags |= MS_RDONLY;
*flags |= MS_RDONLY;
}
}
return 0;
}
static struct super_operations hfsplus_sops = {
.alloc_inode = hfsplus_alloc_inode,
.destroy_inode = hfsplus_destroy_inode,
.read_inode = hfsplus_read_inode,
.write_inode = hfsplus_write_inode,
.clear_inode = hfsplus_clear_inode,
.put_super = hfsplus_put_super,
.write_super = hfsplus_write_super,
.statfs = hfsplus_statfs,
.remount_fs = hfsplus_remount,
};
static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
{
struct hfsplus_vh *vhdr;
struct hfsplus_sb_info *sbi;
hfsplus_cat_entry entry;
struct hfs_find_data fd;
struct inode *root;
struct qstr str;
struct nls_table *nls = NULL;
int err = -EINVAL;
sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
sb->s_fs_info = sbi;
INIT_HLIST_HEAD(&sbi->rsrc_inodes);
fill_defaults(sbi);
if (!parse_options(data, sbi)) {
if (!silent)
printk("HFS+-fs: unable to parse mount options\n");
err = -EINVAL;
goto cleanup;
}
/* temporarily use utf8 to correctly find the hidden dir below */
nls = sbi->nls;
sbi->nls = load_nls("utf8");
if (!nls) {
printk("HFS+: unable to load nls for utf8\n");
err = -EINVAL;
goto cleanup;
}
/* Grab the volume header */
if (hfsplus_read_wrapper(sb)) {
if (!silent)
printk("HFS+-fs: unable to find HFS+ superblock\n");
err = -EINVAL;
goto cleanup;
}
vhdr = HFSPLUS_SB(sb).s_vhdr;
/* Copy parts of the volume header into the superblock */
sb->s_magic = be16_to_cpu(vhdr->signature);
if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
if (!silent)
printk("HFS+-fs: wrong filesystem version\n");
goto cleanup;
}
HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
if (!HFSPLUS_SB(sb).data_clump_blocks)
HFSPLUS_SB(sb).data_clump_blocks = 1;
HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
/* Set up operations so we can load metadata */
sb->s_op = &hfsplus_sops;
sb->s_maxbytes = MAX_LFS_FILESIZE;
if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
if (!silent)
printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
"running fsck.hfsplus is recommended. mounting read-only.\n");
sb->s_flags |= MS_RDONLY;
} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
if (!silent)
printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
sb->s_flags |= MS_RDONLY;
}
/* Load metadata objects (B*Trees) */
HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
if (!HFSPLUS_SB(sb).ext_tree) {
if (!silent)
printk("HFS+-fs: failed to load extents file\n");
goto cleanup;
}
HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
if (!HFSPLUS_SB(sb).cat_tree) {
if (!silent)
printk("HFS+-fs: failed to load catalog file\n");
goto cleanup;
}
HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
if (!HFSPLUS_SB(sb).alloc_file) {
if (!silent)
printk("HFS+-fs: failed to load allocation file\n");
goto cleanup;
}
/* Load the root directory */
root = iget(sb, HFSPLUS_ROOT_CNID);
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
if (!silent)
printk("HFS+-fs: failed to load root directory\n");
iput(root);
goto cleanup;
}
str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
str.name = HFSP_HIDDENDIR_NAME;
hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
hfs_find_exit(&fd);
if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
goto cleanup;
HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
if (!HFSPLUS_SB(sb).hidden_dir)
goto cleanup;
} else
hfs_find_exit(&fd);
if (sb->s_flags & MS_RDONLY)
goto out;
/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
* all three are registered with Apple for our use
*/
vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
vhdr->modify_date = hfsp_now2mt();
vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
if (!HFSPLUS_SB(sb).hidden_dir) {
printk("HFS+: create hidden dir...\n");
HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
&str, HFSPLUS_SB(sb).hidden_dir);
mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
}
out:
unload_nls(sbi->nls);
sbi->nls = nls;
return 0;
cleanup:
hfsplus_put_super(sb);
if (nls)
unload_nls(nls);
return err;
}
MODULE_AUTHOR("Brad Boyer");
MODULE_DESCRIPTION("Extended Macintosh Filesystem");
MODULE_LICENSE("GPL");
static kmem_cache_t *hfsplus_inode_cachep;
static struct inode *hfsplus_alloc_inode(struct super_block *sb)
{
struct hfsplus_inode_info *i;
i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
return i ? &i->vfs_inode : NULL;
}
static void hfsplus_destroy_inode(struct inode *inode)
{
kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
}
#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
}
static struct file_system_type hfsplus_fs_type = {
.owner = THIS_MODULE,
.name = "hfsplus",
.get_sb = hfsplus_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
{
struct hfsplus_inode_info *i = p;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&i->vfs_inode);
}
static int __init init_hfsplus_fs(void)
{
int err;
hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
hfsplus_init_once, NULL);
if (!hfsplus_inode_cachep)
return -ENOMEM;
err = register_filesystem(&hfsplus_fs_type);
if (err)
kmem_cache_destroy(hfsplus_inode_cachep);
return err;
}
static void __exit exit_hfsplus_fs(void)
{
unregister_filesystem(&hfsplus_fs_type);
if (kmem_cache_destroy(hfsplus_inode_cachep))
printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
}
module_init(init_hfsplus_fs)
module_exit(exit_hfsplus_fs)
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