526 lines
16 KiB
C
526 lines
16 KiB
C
/*
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* linux/fs/hfsplus/inode.c
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*
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* Copyright (C) 2001
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* Brad Boyer (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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*
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* Inode handling routines
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*/
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/mpage.h>
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#include <linux/sched.h>
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#include "hfsplus_fs.h"
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#include "hfsplus_raw.h"
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static int hfsplus_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page, hfsplus_get_block);
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}
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static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page, hfsplus_get_block, wbc);
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}
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static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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*pagep = NULL;
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return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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hfsplus_get_block,
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&HFSPLUS_I(mapping->host).phys_size);
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}
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static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, hfsplus_get_block);
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}
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static int hfsplus_releasepage(struct page *page, gfp_t mask)
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{
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struct inode *inode = page->mapping->host;
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struct super_block *sb = inode->i_sb;
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struct hfs_btree *tree;
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struct hfs_bnode *node;
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u32 nidx;
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int i, res = 1;
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switch (inode->i_ino) {
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case HFSPLUS_EXT_CNID:
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tree = HFSPLUS_SB(sb).ext_tree;
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break;
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case HFSPLUS_CAT_CNID:
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tree = HFSPLUS_SB(sb).cat_tree;
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break;
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case HFSPLUS_ATTR_CNID:
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tree = HFSPLUS_SB(sb).attr_tree;
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break;
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default:
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BUG();
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return 0;
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}
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if (!tree)
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return 0;
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if (tree->node_size >= PAGE_CACHE_SIZE) {
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nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
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spin_lock(&tree->hash_lock);
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node = hfs_bnode_findhash(tree, nidx);
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if (!node)
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;
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else if (atomic_read(&node->refcnt))
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res = 0;
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if (res && node) {
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hfs_bnode_unhash(node);
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hfs_bnode_free(node);
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}
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spin_unlock(&tree->hash_lock);
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} else {
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nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
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i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
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spin_lock(&tree->hash_lock);
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do {
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node = hfs_bnode_findhash(tree, nidx++);
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if (!node)
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continue;
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if (atomic_read(&node->refcnt)) {
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res = 0;
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break;
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}
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hfs_bnode_unhash(node);
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hfs_bnode_free(node);
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} while (--i && nidx < tree->node_count);
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spin_unlock(&tree->hash_lock);
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}
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return res ? try_to_free_buffers(page) : 0;
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}
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static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
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const struct iovec *iov, loff_t offset, unsigned long nr_segs)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
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return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
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offset, nr_segs, hfsplus_get_block, NULL);
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}
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static int hfsplus_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, hfsplus_get_block);
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}
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const struct address_space_operations hfsplus_btree_aops = {
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.readpage = hfsplus_readpage,
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.writepage = hfsplus_writepage,
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.sync_page = block_sync_page,
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.write_begin = hfsplus_write_begin,
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.write_end = generic_write_end,
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.bmap = hfsplus_bmap,
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.releasepage = hfsplus_releasepage,
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};
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const struct address_space_operations hfsplus_aops = {
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.readpage = hfsplus_readpage,
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.writepage = hfsplus_writepage,
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.sync_page = block_sync_page,
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.write_begin = hfsplus_write_begin,
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.write_end = generic_write_end,
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.bmap = hfsplus_bmap,
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.direct_IO = hfsplus_direct_IO,
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.writepages = hfsplus_writepages,
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};
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const struct dentry_operations hfsplus_dentry_operations = {
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.d_hash = hfsplus_hash_dentry,
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.d_compare = hfsplus_compare_dentry,
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};
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static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct hfs_find_data fd;
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struct super_block *sb = dir->i_sb;
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struct inode *inode = NULL;
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int err;
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if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
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goto out;
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inode = HFSPLUS_I(dir).rsrc_inode;
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if (inode)
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goto out;
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inode = new_inode(sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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inode->i_ino = dir->i_ino;
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INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
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mutex_init(&HFSPLUS_I(inode).extents_lock);
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HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
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hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
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err = hfsplus_find_cat(sb, dir->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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if (err) {
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iput(inode);
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return ERR_PTR(err);
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}
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HFSPLUS_I(inode).rsrc_inode = dir;
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HFSPLUS_I(dir).rsrc_inode = inode;
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igrab(dir);
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hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
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mark_inode_dirty(inode);
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out:
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d_add(dentry, inode);
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return NULL;
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}
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static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
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{
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struct super_block *sb = inode->i_sb;
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u16 mode;
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mode = be16_to_cpu(perms->mode);
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inode->i_uid = be32_to_cpu(perms->owner);
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if (!inode->i_uid && !mode)
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inode->i_uid = HFSPLUS_SB(sb).uid;
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inode->i_gid = be32_to_cpu(perms->group);
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if (!inode->i_gid && !mode)
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inode->i_gid = HFSPLUS_SB(sb).gid;
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if (dir) {
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mode = mode ? (mode & S_IALLUGO) :
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(S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
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mode |= S_IFDIR;
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} else if (!mode)
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mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
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~(HFSPLUS_SB(sb).umask));
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inode->i_mode = mode;
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HFSPLUS_I(inode).rootflags = perms->rootflags;
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HFSPLUS_I(inode).userflags = perms->userflags;
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if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
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inode->i_flags |= S_IMMUTABLE;
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else
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inode->i_flags &= ~S_IMMUTABLE;
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if (perms->rootflags & HFSPLUS_FLG_APPEND)
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inode->i_flags |= S_APPEND;
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else
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inode->i_flags &= ~S_APPEND;
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}
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static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
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{
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if (inode->i_flags & S_IMMUTABLE)
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perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
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else
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perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
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if (inode->i_flags & S_APPEND)
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perms->rootflags |= HFSPLUS_FLG_APPEND;
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else
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perms->rootflags &= ~HFSPLUS_FLG_APPEND;
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perms->userflags = HFSPLUS_I(inode).userflags;
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perms->mode = cpu_to_be16(inode->i_mode);
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perms->owner = cpu_to_be32(inode->i_uid);
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perms->group = cpu_to_be32(inode->i_gid);
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perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
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}
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static int hfsplus_file_open(struct inode *inode, struct file *file)
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{
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if (HFSPLUS_IS_RSRC(inode))
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inode = HFSPLUS_I(inode).rsrc_inode;
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if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
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return -EOVERFLOW;
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atomic_inc(&HFSPLUS_I(inode).opencnt);
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return 0;
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}
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static int hfsplus_file_release(struct inode *inode, struct file *file)
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{
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struct super_block *sb = inode->i_sb;
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if (HFSPLUS_IS_RSRC(inode))
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inode = HFSPLUS_I(inode).rsrc_inode;
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if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
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mutex_lock(&inode->i_mutex);
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hfsplus_file_truncate(inode);
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if (inode->i_flags & S_DEAD) {
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hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
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hfsplus_delete_inode(inode);
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}
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mutex_unlock(&inode->i_mutex);
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}
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return 0;
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}
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static const struct inode_operations hfsplus_file_inode_operations = {
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.lookup = hfsplus_file_lookup,
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.truncate = hfsplus_file_truncate,
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.setxattr = hfsplus_setxattr,
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.getxattr = hfsplus_getxattr,
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.listxattr = hfsplus_listxattr,
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};
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static const struct file_operations hfsplus_file_operations = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.write = do_sync_write,
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.aio_write = generic_file_aio_write,
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.mmap = generic_file_mmap,
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.splice_read = generic_file_splice_read,
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.fsync = file_fsync,
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.open = hfsplus_file_open,
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.release = hfsplus_file_release,
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.ioctl = hfsplus_ioctl,
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};
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struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
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{
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struct inode *inode = new_inode(sb);
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if (!inode)
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return NULL;
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inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
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inode->i_mode = mode;
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inode->i_uid = current_fsuid();
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inode->i_gid = current_fsgid();
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inode->i_nlink = 1;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
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INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
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mutex_init(&HFSPLUS_I(inode).extents_lock);
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atomic_set(&HFSPLUS_I(inode).opencnt, 0);
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HFSPLUS_I(inode).flags = 0;
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memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
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memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
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HFSPLUS_I(inode).alloc_blocks = 0;
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HFSPLUS_I(inode).first_blocks = 0;
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HFSPLUS_I(inode).cached_start = 0;
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HFSPLUS_I(inode).cached_blocks = 0;
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HFSPLUS_I(inode).phys_size = 0;
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HFSPLUS_I(inode).fs_blocks = 0;
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HFSPLUS_I(inode).rsrc_inode = NULL;
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if (S_ISDIR(inode->i_mode)) {
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inode->i_size = 2;
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HFSPLUS_SB(sb).folder_count++;
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inode->i_op = &hfsplus_dir_inode_operations;
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inode->i_fop = &hfsplus_dir_operations;
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} else if (S_ISREG(inode->i_mode)) {
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HFSPLUS_SB(sb).file_count++;
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inode->i_op = &hfsplus_file_inode_operations;
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inode->i_fop = &hfsplus_file_operations;
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inode->i_mapping->a_ops = &hfsplus_aops;
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HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
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} else if (S_ISLNK(inode->i_mode)) {
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HFSPLUS_SB(sb).file_count++;
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inode->i_op = &page_symlink_inode_operations;
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inode->i_mapping->a_ops = &hfsplus_aops;
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HFSPLUS_I(inode).clump_blocks = 1;
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} else
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HFSPLUS_SB(sb).file_count++;
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insert_inode_hash(inode);
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mark_inode_dirty(inode);
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sb->s_dirt = 1;
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return inode;
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}
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void hfsplus_delete_inode(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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if (S_ISDIR(inode->i_mode)) {
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HFSPLUS_SB(sb).folder_count--;
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sb->s_dirt = 1;
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return;
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}
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HFSPLUS_SB(sb).file_count--;
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if (S_ISREG(inode->i_mode)) {
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if (!inode->i_nlink) {
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inode->i_size = 0;
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hfsplus_file_truncate(inode);
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}
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} else if (S_ISLNK(inode->i_mode)) {
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inode->i_size = 0;
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hfsplus_file_truncate(inode);
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}
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sb->s_dirt = 1;
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}
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void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
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{
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struct super_block *sb = inode->i_sb;
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u32 count;
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int i;
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memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
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sizeof(hfsplus_extent_rec));
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for (count = 0, i = 0; i < 8; i++)
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count += be32_to_cpu(fork->extents[i].block_count);
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HFSPLUS_I(inode).first_blocks = count;
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memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
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HFSPLUS_I(inode).cached_start = 0;
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HFSPLUS_I(inode).cached_blocks = 0;
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HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
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inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
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HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
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inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
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HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
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if (!HFSPLUS_I(inode).clump_blocks)
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HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
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HFSPLUS_SB(sb).data_clump_blocks;
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}
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void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
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{
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memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
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sizeof(hfsplus_extent_rec));
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fork->total_size = cpu_to_be64(inode->i_size);
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fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
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}
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int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
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{
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hfsplus_cat_entry entry;
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int res = 0;
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u16 type;
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type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
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HFSPLUS_I(inode).dev = 0;
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if (type == HFSPLUS_FOLDER) {
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struct hfsplus_cat_folder *folder = &entry.folder;
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if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
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/* panic? */;
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hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
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sizeof(struct hfsplus_cat_folder));
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hfsplus_get_perms(inode, &folder->permissions, 1);
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inode->i_nlink = 1;
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inode->i_size = 2 + be32_to_cpu(folder->valence);
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inode->i_atime = hfsp_mt2ut(folder->access_date);
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inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
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inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
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HFSPLUS_I(inode).create_date = folder->create_date;
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HFSPLUS_I(inode).fs_blocks = 0;
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inode->i_op = &hfsplus_dir_inode_operations;
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inode->i_fop = &hfsplus_dir_operations;
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} else if (type == HFSPLUS_FILE) {
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struct hfsplus_cat_file *file = &entry.file;
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if (fd->entrylength < sizeof(struct hfsplus_cat_file))
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/* panic? */;
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hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
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sizeof(struct hfsplus_cat_file));
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hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
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&file->data_fork : &file->rsrc_fork);
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hfsplus_get_perms(inode, &file->permissions, 0);
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inode->i_nlink = 1;
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if (S_ISREG(inode->i_mode)) {
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if (file->permissions.dev)
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inode->i_nlink = be32_to_cpu(file->permissions.dev);
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inode->i_op = &hfsplus_file_inode_operations;
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inode->i_fop = &hfsplus_file_operations;
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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;
|
|
}
|