--- /dev/null
+/*
+ * 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/uio.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+#include "xattr.h"
+#include "acl.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_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(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
+{
+ struct file *file = iocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *inode = file_inode(file)->i_mapping->host;
+ size_t count = iov_iter_count(iter);
+ ssize_t ret;
+
+ ret = blockdev_direct_IO(iocb, inode, iter, offset, 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 = offset + 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)) {
+ 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 int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ int error;
+
+ error = inode_change_ok(inode, 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);
+
+ if (attr->ia_valid & ATTR_MODE) {
+ error = posix_acl_chmod(inode, inode->i_mode);
+ if (unlikely(error))
+ return error;
+ }
+
+ 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 = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (error)
+ return error;
+ mutex_lock(&inode->i_mutex);
+
+ /*
+ * 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);
+
+ mutex_unlock(&inode->i_mutex);
+
+ return error;
+}
+
+static const struct inode_operations hfsplus_file_inode_operations = {
+ .setattr = hfsplus_setattr,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = hfsplus_listxattr,
+ .removexattr = generic_removexattr,
+#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
+ .get_acl = hfsplus_get_posix_acl,
+ .set_acl = hfsplus_set_posix_acl,
+#endif
+};
+
+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, 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->i_mode = mode;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
+ set_nlink(inode, 1);
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+
+ hip = HFSPLUS_I(inode);
+ INIT_LIST_HEAD(&hip->open_dir_list);
+ 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->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 = 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;
+ 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->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 {
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff