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https://github.com/edk2-porting/linux-next.git
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e349470560
Avoid doing unessecary work in fsync. Do nothing unless the inode was marked dirty, and only write the various metadata inodes out if they contain any dirty state from this inode. This is archived by adding three new dirty bits to the hfsplus-specific inode which are set in the correct places. Signed-off-by: Christoph Hellwig <hch@tuxera.com>
608 lines
17 KiB
C
608 lines
17 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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int ret;
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*pagep = NULL;
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ret = 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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if (unlikely(ret)) {
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loff_t isize = mapping->host->i_size;
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if (pos + len > isize)
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vmtruncate(mapping->host, isize);
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}
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return ret;
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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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ssize_t ret;
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ret = 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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* In case of error extending write may have instantiated a few
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* blocks outside i_size. Trim these off again.
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*/
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if (unlikely((rw & WRITE) && ret < 0)) {
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loff_t isize = i_size_read(inode);
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loff_t end = offset + iov_length(iov, nr_segs);
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if (end > isize)
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vmtruncate(inode, isize);
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}
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return ret;
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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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struct hfsplus_inode_info *hip;
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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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hip = HFSPLUS_I(inode);
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inode->i_ino = dir->i_ino;
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INIT_LIST_HEAD(&hip->open_dir_list);
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mutex_init(&hip->extents_lock);
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hip->extent_state = 0;
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hip->flags = 0;
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set_bit(HFSPLUS_I_RSRC, &hip->flags);
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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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hip->rsrc_inode = dir;
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HFSPLUS_I(dir)->rsrc_inode = inode;
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igrab(dir);
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/*
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* __mark_inode_dirty expects inodes to be hashed. Since we don't
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* want resource fork inodes in the regular inode space, we make them
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* appear hashed, but do not put on any lists. hlist_del()
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* will work fine and require no locking.
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*/
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hlist_add_fake(&inode->i_hash);
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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 hfsplus_sb_info *sbi = HFSPLUS_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 = sbi->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 = sbi->gid;
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if (dir) {
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mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->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) & ~(sbi->umask));
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inode->i_mode = mode;
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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 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,
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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 int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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error = inode_change_ok(inode, attr);
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if (error)
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return error;
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if ((attr->ia_valid & ATTR_SIZE) &&
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attr->ia_size != i_size_read(inode)) {
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error = vmtruncate(inode, attr->ia_size);
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if (error)
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return error;
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}
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setattr_copy(inode, attr);
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mark_inode_dirty(inode);
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return 0;
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}
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int hfsplus_file_fsync(struct file *file, int datasync)
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{
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struct inode *inode = file->f_mapping->host;
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
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int error = 0, error2;
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/*
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* Sync inode metadata into the catalog and extent trees.
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*/
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sync_inode_metadata(inode, 1);
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/*
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* And explicitly write out the btrees.
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*/
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if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
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error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
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if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
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error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
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if (!error)
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error = error2;
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}
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if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
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error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
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if (!error)
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error = error2;
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}
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return error;
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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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.setattr = hfsplus_setattr,
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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 = hfsplus_file_fsync,
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.open = hfsplus_file_open,
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.release = hfsplus_file_release,
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.unlocked_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 hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
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struct inode *inode = new_inode(sb);
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struct hfsplus_inode_info *hip;
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if (!inode)
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return NULL;
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inode->i_ino = sbi->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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hip = HFSPLUS_I(inode);
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INIT_LIST_HEAD(&hip->open_dir_list);
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mutex_init(&hip->extents_lock);
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atomic_set(&hip->opencnt, 0);
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hip->extent_state = 0;
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hip->flags = 0;
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memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
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memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
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hip->alloc_blocks = 0;
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hip->first_blocks = 0;
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hip->cached_start = 0;
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hip->cached_blocks = 0;
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hip->phys_size = 0;
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hip->fs_blocks = 0;
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hip->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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sbi->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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sbi->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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hip->clump_blocks = sbi->data_clump_blocks;
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} else if (S_ISLNK(inode->i_mode)) {
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sbi->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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hip->clump_blocks = 1;
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} else
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sbi->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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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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u32 count;
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int i;
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memcpy(&hip->first_extents, &fork->extents, 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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hip->first_blocks = count;
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memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
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hip->cached_start = 0;
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hip->cached_blocks = 0;
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hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
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hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
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hip->fs_blocks =
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(inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
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inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
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hip->clump_blocks =
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be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
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if (!hip->clump_blocks) {
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hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
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sbi->rsrc_clump_blocks :
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sbi->data_clump_blocks;
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}
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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,
|
|
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);
|
|
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_RSRC(inode) ?
|
|
&file->rsrc_fork : &file->data_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_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);
|
|
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 ((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));
|
|
}
|
|
|
|
set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
|
|
out:
|
|
hfs_find_exit(&fd);
|
|
return 0;
|
|
}
|