--- /dev/null
+/*
+ * linux/fs/hfsplus/super.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/slab.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"
+#include "xattr.h"
+
+static int hfsplus_system_read_inode(struct inode *inode)
+{
+ struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
+
+ switch (inode->i_ino) {
+ 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:
+ return -EIO;
+ }
+
+ return 0;
+}
+
+struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
+{
+ struct hfs_find_data fd;
+ struct inode *inode;
+ int err;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
+ mutex_init(&HFSPLUS_I(inode)->extents_lock);
+ HFSPLUS_I(inode)->flags = 0;
+ HFSPLUS_I(inode)->extent_state = 0;
+ HFSPLUS_I(inode)->rsrc_inode = NULL;
+ atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
+
+ if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
+ inode->i_ino == HFSPLUS_ROOT_CNID) {
+ err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
+ if (!err) {
+ err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+ if (!err)
+ err = hfsplus_cat_read_inode(inode, &fd);
+ hfs_find_exit(&fd);
+ }
+ } else {
+ err = hfsplus_system_read_inode(inode);
+ }
+
+ if (err) {
+ iget_failed(inode);
+ return ERR_PTR(err);
+ }
+
+ unlock_new_inode(inode);
+ return inode;
+}
+
+static int hfsplus_system_write_inode(struct inode *inode)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
+ struct hfsplus_vh *vhdr = sbi->s_vhdr;
+ struct hfsplus_fork_raw *fork;
+ struct hfs_btree *tree = NULL;
+
+ switch (inode->i_ino) {
+ case HFSPLUS_EXT_CNID:
+ fork = &vhdr->ext_file;
+ tree = sbi->ext_tree;
+ break;
+ case HFSPLUS_CAT_CNID:
+ fork = &vhdr->cat_file;
+ tree = sbi->cat_tree;
+ break;
+ case HFSPLUS_ALLOC_CNID:
+ fork = &vhdr->alloc_file;
+ break;
+ case HFSPLUS_START_CNID:
+ fork = &vhdr->start_file;
+ break;
+ case HFSPLUS_ATTR_CNID:
+ fork = &vhdr->attr_file;
+ tree = sbi->attr_tree;
+ break;
+ default:
+ return -EIO;
+ }
+
+ if (fork->total_size != cpu_to_be64(inode->i_size)) {
+ set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
+ hfsplus_mark_mdb_dirty(inode->i_sb);
+ }
+ hfsplus_inode_write_fork(inode, fork);
+ if (tree) {
+ int err = hfs_btree_write(tree);
+
+ if (err) {
+ pr_err("b-tree write err: %d, ino %lu\n",
+ err, inode->i_ino);
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int hfsplus_write_inode(struct inode *inode,
+ struct writeback_control *wbc)
+{
+ int err;
+
+ hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
+
+ err = hfsplus_ext_write_extent(inode);
+ if (err)
+ return err;
+
+ if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
+ inode->i_ino == HFSPLUS_ROOT_CNID)
+ return hfsplus_cat_write_inode(inode);
+ else
+ return hfsplus_system_write_inode(inode);
+}
+
+static void hfsplus_evict_inode(struct inode *inode)
+{
+ hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
+ truncate_inode_pages_final(&inode->i_data);
+ clear_inode(inode);
+ if (HFSPLUS_IS_RSRC(inode)) {
+ HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
+ iput(HFSPLUS_I(inode)->rsrc_inode);
+ }
+}
+
+static int hfsplus_sync_fs(struct super_block *sb, int wait)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
+ struct hfsplus_vh *vhdr = sbi->s_vhdr;
+ int write_backup = 0;
+ int error, error2;
+
+ if (!wait)
+ return 0;
+
+ hfs_dbg(SUPER, "hfsplus_sync_fs\n");
+
+ /*
+ * Explicitly write out the special metadata inodes.
+ *
+ * While these special inodes are marked as hashed and written
+ * out peridocically by the flusher threads we redirty them
+ * during writeout of normal inodes, and thus the life lock
+ * prevents us from getting the latest state to disk.
+ */
+ error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
+ error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
+ if (!error)
+ error = error2;
+ if (sbi->attr_tree) {
+ error2 =
+ filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
+ if (!error)
+ error = error2;
+ }
+ error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
+ if (!error)
+ error = error2;
+
+ mutex_lock(&sbi->vh_mutex);
+ mutex_lock(&sbi->alloc_mutex);
+ vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
+ vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
+ vhdr->folder_count = cpu_to_be32(sbi->folder_count);
+ vhdr->file_count = cpu_to_be32(sbi->file_count);
+
+ if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
+ memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
+ write_backup = 1;
+ }
+
+ error2 = hfsplus_submit_bio(sb,
+ sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
+ sbi->s_vhdr_buf, NULL, WRITE_SYNC);
+ if (!error)
+ error = error2;
+ if (!write_backup)
+ goto out;
+
+ error2 = hfsplus_submit_bio(sb,
+ sbi->part_start + sbi->sect_count - 2,
+ sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
+ if (!error)
+ error2 = error;
+out:
+ mutex_unlock(&sbi->alloc_mutex);
+ mutex_unlock(&sbi->vh_mutex);
+
+ if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+ blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
+
+ return error;
+}
+
+static void delayed_sync_fs(struct work_struct *work)
+{
+ int err;
+ struct hfsplus_sb_info *sbi;
+
+ sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
+
+ spin_lock(&sbi->work_lock);
+ sbi->work_queued = 0;
+ spin_unlock(&sbi->work_lock);
+
+ err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
+ if (err)
+ pr_err("delayed sync fs err %d\n", err);
+}
+
+void hfsplus_mark_mdb_dirty(struct super_block *sb)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
+ unsigned long delay;
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ spin_lock(&sbi->work_lock);
+ if (!sbi->work_queued) {
+ delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+ queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
+ sbi->work_queued = 1;
+ }
+ spin_unlock(&sbi->work_lock);
+}
+
+static void hfsplus_put_super(struct super_block *sb)
+{
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
+
+ hfs_dbg(SUPER, "hfsplus_put_super\n");
+
+ cancel_delayed_work_sync(&sbi->sync_work);
+
+ if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
+ struct hfsplus_vh *vhdr = sbi->s_vhdr;
+
+ vhdr->modify_date = hfsp_now2mt();
+ vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
+ vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
+
+ hfsplus_sync_fs(sb, 1);
+ }
+
+ hfs_btree_close(sbi->attr_tree);
+ hfs_btree_close(sbi->cat_tree);
+ hfs_btree_close(sbi->ext_tree);
+ iput(sbi->alloc_file);
+ iput(sbi->hidden_dir);
+ kfree(sbi->s_vhdr_buf);
+ kfree(sbi->s_backup_vhdr_buf);
+ unload_nls(sbi->nls);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+}
+
+static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = HFSPLUS_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
+ buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
+ buf->f_bavail = buf->f_bfree;
+ buf->f_files = 0xFFFFFFFF;
+ buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+ buf->f_namelen = HFSPLUS_MAX_STRLEN;
+
+ return 0;
+}
+
+static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ return 0;
+ if (!(*flags & MS_RDONLY)) {
+ struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
+ int force = 0;
+
+ if (!hfsplus_parse_options_remount(data, &force))
+ return -EINVAL;
+
+ if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
+ pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ *flags |= MS_RDONLY;
+ } else if (force) {
+ /* nothing */
+ } else if (vhdr->attributes &
+ cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+ pr_warn("filesystem is marked locked, leaving read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ *flags |= MS_RDONLY;
+ } else if (vhdr->attributes &
+ cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
+ pr_warn("filesystem is marked journaled, leaving read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ *flags |= MS_RDONLY;
+ }
+ }
+ return 0;
+}
+
+static const struct super_operations hfsplus_sops = {
+ .alloc_inode = hfsplus_alloc_inode,
+ .destroy_inode = hfsplus_destroy_inode,
+ .write_inode = hfsplus_write_inode,
+ .evict_inode = hfsplus_evict_inode,
+ .put_super = hfsplus_put_super,
+ .sync_fs = hfsplus_sync_fs,
+ .statfs = hfsplus_statfs,
+ .remount_fs = hfsplus_remount,
+ .show_options = hfsplus_show_options,
+};
+
+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, *inode;
+ struct qstr str;
+ struct nls_table *nls = NULL;
+ u64 last_fs_block, last_fs_page;
+ int err;
+
+ err = -ENOMEM;
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi)
+ goto out;
+
+ sb->s_fs_info = sbi;
+ mutex_init(&sbi->alloc_mutex);
+ mutex_init(&sbi->vh_mutex);
+ spin_lock_init(&sbi->work_lock);
+ INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
+ hfsplus_fill_defaults(sbi);
+
+ err = -EINVAL;
+ if (!hfsplus_parse_options(data, sbi)) {
+ pr_err("unable to parse mount options\n");
+ goto out_unload_nls;
+ }
+
+ /* temporarily use utf8 to correctly find the hidden dir below */
+ nls = sbi->nls;
+ sbi->nls = load_nls("utf8");
+ if (!sbi->nls) {
+ pr_err("unable to load nls for utf8\n");
+ goto out_unload_nls;
+ }
+
+ /* Grab the volume header */
+ if (hfsplus_read_wrapper(sb)) {
+ if (!silent)
+ pr_warn("unable to find HFS+ superblock\n");
+ goto out_unload_nls;
+ }
+ vhdr = sbi->s_vhdr;
+
+ /* Copy parts of the volume header into the superblock */
+ sb->s_magic = HFSPLUS_VOLHEAD_SIG;
+ if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
+ be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
+ pr_err("wrong filesystem version\n");
+ goto out_free_vhdr;
+ }
+ sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
+ sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
+ sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
+ sbi->file_count = be32_to_cpu(vhdr->file_count);
+ sbi->folder_count = be32_to_cpu(vhdr->folder_count);
+ sbi->data_clump_blocks =
+ be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
+ if (!sbi->data_clump_blocks)
+ sbi->data_clump_blocks = 1;
+ sbi->rsrc_clump_blocks =
+ be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
+ if (!sbi->rsrc_clump_blocks)
+ sbi->rsrc_clump_blocks = 1;
+
+ err = -EFBIG;
+ last_fs_block = sbi->total_blocks - 1;
+ last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
+ PAGE_CACHE_SHIFT;
+
+ if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
+ (last_fs_page > (pgoff_t)(~0ULL))) {
+ pr_err("filesystem size too large\n");
+ goto out_free_vhdr;
+ }
+
+ /* 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))) {
+ pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
+ /* nothing */
+ } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
+ pr_warn("Filesystem is marked locked, mounting read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
+ !(sb->s_flags & MS_RDONLY)) {
+ pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ }
+
+ err = -EINVAL;
+
+ /* Load metadata objects (B*Trees) */
+ sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
+ if (!sbi->ext_tree) {
+ pr_err("failed to load extents file\n");
+ goto out_free_vhdr;
+ }
+ sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
+ if (!sbi->cat_tree) {
+ pr_err("failed to load catalog file\n");
+ goto out_close_ext_tree;
+ }
+ atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
+ if (vhdr->attr_file.total_blocks != 0) {
+ sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
+ if (!sbi->attr_tree) {
+ pr_err("failed to load attributes file\n");
+ goto out_close_cat_tree;
+ }
+ atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
+ }
+ sb->s_xattr = hfsplus_xattr_handlers;
+
+ inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
+ if (IS_ERR(inode)) {
+ pr_err("failed to load allocation file\n");
+ err = PTR_ERR(inode);
+ goto out_close_attr_tree;
+ }
+ sbi->alloc_file = inode;
+
+ /* Load the root directory */
+ root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
+ if (IS_ERR(root)) {
+ pr_err("failed to load root directory\n");
+ err = PTR_ERR(root);
+ goto out_put_alloc_file;
+ }
+
+ sb->s_d_op = &hfsplus_dentry_operations;
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ err = -ENOMEM;
+ goto out_put_alloc_file;
+ }
+
+ str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
+ str.name = HFSP_HIDDENDIR_NAME;
+ err = hfs_find_init(sbi->cat_tree, &fd);
+ if (err)
+ goto out_put_root;
+ err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
+ if (unlikely(err < 0))
+ goto out_put_root;
+ if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
+ hfs_find_exit(&fd);
+ if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
+ goto out_put_root;
+ inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto out_put_root;
+ }
+ sbi->hidden_dir = inode;
+ } else
+ hfs_find_exit(&fd);
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ /*
+ * 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();
+ be32_add_cpu(&vhdr->write_count, 1);
+ vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
+ vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
+ hfsplus_sync_fs(sb, 1);
+
+ if (!sbi->hidden_dir) {
+ mutex_lock(&sbi->vh_mutex);
+ sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
+ if (!sbi->hidden_dir) {
+ mutex_unlock(&sbi->vh_mutex);
+ err = -ENOMEM;
+ goto out_put_root;
+ }
+ err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
+ &str, sbi->hidden_dir);
+ if (err) {
+ mutex_unlock(&sbi->vh_mutex);
+ goto out_put_hidden_dir;
+ }
+
+ err = hfsplus_init_inode_security(sbi->hidden_dir,
+ root, &str);
+ if (err == -EOPNOTSUPP)
+ err = 0; /* Operation is not supported. */
+ else if (err) {
+ /*
+ * Try to delete anyway without
+ * error analysis.
+ */
+ hfsplus_delete_cat(sbi->hidden_dir->i_ino,
+ root, &str);
+ mutex_unlock(&sbi->vh_mutex);
+ goto out_put_hidden_dir;
+ }
+
+ mutex_unlock(&sbi->vh_mutex);
+ hfsplus_mark_inode_dirty(sbi->hidden_dir,
+ HFSPLUS_I_CAT_DIRTY);
+ }
+ }
+
+ unload_nls(sbi->nls);
+ sbi->nls = nls;
+ return 0;
+
+out_put_hidden_dir:
+ iput(sbi->hidden_dir);
+out_put_root:
+ dput(sb->s_root);
+ sb->s_root = NULL;
+out_put_alloc_file:
+ iput(sbi->alloc_file);
+out_close_attr_tree:
+ hfs_btree_close(sbi->attr_tree);
+out_close_cat_tree:
+ hfs_btree_close(sbi->cat_tree);
+out_close_ext_tree:
+ hfs_btree_close(sbi->ext_tree);
+out_free_vhdr:
+ kfree(sbi->s_vhdr_buf);
+ kfree(sbi->s_backup_vhdr_buf);
+out_unload_nls:
+ unload_nls(sbi->nls);
+ unload_nls(nls);
+ kfree(sbi);
+out:
+ return err;
+}
+
+MODULE_AUTHOR("Brad Boyer");
+MODULE_DESCRIPTION("Extended Macintosh Filesystem");
+MODULE_LICENSE("GPL");
+
+static struct kmem_cache *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, GFP_KERNEL);
+ return i ? &i->vfs_inode : NULL;
+}
+
+static void hfsplus_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+
+ kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
+}
+
+static void hfsplus_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hfsplus_i_callback);
+}
+
+#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
+
+static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
+}
+
+static struct file_system_type hfsplus_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "hfsplus",
+ .mount = hfsplus_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("hfsplus");
+
+static void hfsplus_init_once(void *p)
+{
+ struct hfsplus_inode_info *i = p;
+
+ 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);
+ if (!hfsplus_inode_cachep)
+ return -ENOMEM;
+ err = hfsplus_create_attr_tree_cache();
+ if (err)
+ goto destroy_inode_cache;
+ err = register_filesystem(&hfsplus_fs_type);
+ if (err)
+ goto destroy_attr_tree_cache;
+ return 0;
+
+destroy_attr_tree_cache:
+ hfsplus_destroy_attr_tree_cache();
+
+destroy_inode_cache:
+ kmem_cache_destroy(hfsplus_inode_cachep);
+
+ return err;
+}
+
+static void __exit exit_hfsplus_fs(void)
+{
+ unregister_filesystem(&hfsplus_fs_type);
+
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ hfsplus_destroy_attr_tree_cache();
+ kmem_cache_destroy(hfsplus_inode_cachep);
+}
+
+module_init(init_hfsplus_fs)
+module_exit(exit_hfsplus_fs)
Code Review / kvmfornfv.git / blobdiff