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![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
666 lines
16 KiB
C
666 lines
16 KiB
C
/* dir.c: AFS filesystem directory handling
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include "vnode.h"
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#include "volume.h"
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#include <rxrpc/call.h>
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#include "super.h"
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#include "internal.h"
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static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd);
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static int afs_dir_open(struct inode *inode, struct file *file);
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static int afs_dir_readdir(struct file *file, void *dirent, filldir_t filldir);
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static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd);
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static int afs_d_delete(struct dentry *dentry);
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static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
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loff_t fpos, ino_t ino, unsigned dtype);
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struct file_operations afs_dir_file_operations = {
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.open = afs_dir_open,
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.readdir = afs_dir_readdir,
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};
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struct inode_operations afs_dir_inode_operations = {
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.lookup = afs_dir_lookup,
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.getattr = afs_inode_getattr,
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#if 0 /* TODO */
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.create = afs_dir_create,
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.link = afs_dir_link,
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.unlink = afs_dir_unlink,
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.symlink = afs_dir_symlink,
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.mkdir = afs_dir_mkdir,
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.rmdir = afs_dir_rmdir,
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.mknod = afs_dir_mknod,
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.rename = afs_dir_rename,
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#endif
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};
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static struct dentry_operations afs_fs_dentry_operations = {
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.d_revalidate = afs_d_revalidate,
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.d_delete = afs_d_delete,
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};
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#define AFS_DIR_HASHTBL_SIZE 128
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#define AFS_DIR_DIRENT_SIZE 32
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#define AFS_DIRENT_PER_BLOCK 64
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union afs_dirent {
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struct {
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uint8_t valid;
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uint8_t unused[1];
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__be16 hash_next;
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__be32 vnode;
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__be32 unique;
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uint8_t name[16];
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uint8_t overflow[4]; /* if any char of the name (inc
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* NUL) reaches here, consume
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* the next dirent too */
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} u;
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uint8_t extended_name[32];
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};
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/* AFS directory page header (one at the beginning of every 2048-byte chunk) */
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struct afs_dir_pagehdr {
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__be16 npages;
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__be16 magic;
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#define AFS_DIR_MAGIC htons(1234)
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uint8_t nentries;
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uint8_t bitmap[8];
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uint8_t pad[19];
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};
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/* directory block layout */
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union afs_dir_block {
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struct afs_dir_pagehdr pagehdr;
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struct {
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struct afs_dir_pagehdr pagehdr;
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uint8_t alloc_ctrs[128];
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/* dir hash table */
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uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
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} hdr;
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union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
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};
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/* layout on a linux VM page */
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struct afs_dir_page {
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union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
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};
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struct afs_dir_lookup_cookie {
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struct afs_fid fid;
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const char *name;
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size_t nlen;
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int found;
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};
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/*****************************************************************************/
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/*
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* check that a directory page is valid
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*/
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static inline void afs_dir_check_page(struct inode *dir, struct page *page)
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{
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struct afs_dir_page *dbuf;
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loff_t latter;
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int tmp, qty;
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#if 0
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/* check the page count */
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qty = desc.size / sizeof(dbuf->blocks[0]);
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if (qty == 0)
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goto error;
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if (page->index==0 && qty!=ntohs(dbuf->blocks[0].pagehdr.npages)) {
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printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
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__FUNCTION__,dir->i_ino,qty,ntohs(dbuf->blocks[0].pagehdr.npages));
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goto error;
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}
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#endif
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/* determine how many magic numbers there should be in this page */
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latter = dir->i_size - (page->index << PAGE_CACHE_SHIFT);
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if (latter >= PAGE_SIZE)
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qty = PAGE_SIZE;
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else
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qty = latter;
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qty /= sizeof(union afs_dir_block);
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/* check them */
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dbuf = page_address(page);
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for (tmp = 0; tmp < qty; tmp++) {
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if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
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printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
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__FUNCTION__, dir->i_ino, tmp, qty,
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ntohs(dbuf->blocks[tmp].pagehdr.magic));
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goto error;
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}
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}
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SetPageChecked(page);
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return;
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error:
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SetPageChecked(page);
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SetPageError(page);
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} /* end afs_dir_check_page() */
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/*****************************************************************************/
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/*
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* discard a page cached in the pagecache
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*/
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static inline void afs_dir_put_page(struct page *page)
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{
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kunmap(page);
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page_cache_release(page);
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} /* end afs_dir_put_page() */
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/*****************************************************************************/
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/*
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* get a page into the pagecache
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*/
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static struct page *afs_dir_get_page(struct inode *dir, unsigned long index)
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{
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struct page *page;
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_enter("{%lu},%lu", dir->i_ino, index);
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page = read_cache_page(dir->i_mapping,index,
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(filler_t *) dir->i_mapping->a_ops->readpage,
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NULL);
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if (!IS_ERR(page)) {
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wait_on_page_locked(page);
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kmap(page);
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if (!PageUptodate(page))
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goto fail;
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if (!PageChecked(page))
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afs_dir_check_page(dir, page);
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if (PageError(page))
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goto fail;
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}
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return page;
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fail:
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afs_dir_put_page(page);
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return ERR_PTR(-EIO);
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} /* end afs_dir_get_page() */
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/*****************************************************************************/
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/*
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* open an AFS directory file
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*/
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static int afs_dir_open(struct inode *inode, struct file *file)
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{
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_enter("{%lu}", inode->i_ino);
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BUG_ON(sizeof(union afs_dir_block) != 2048);
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BUG_ON(sizeof(union afs_dirent) != 32);
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if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED)
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return -ENOENT;
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_leave(" = 0");
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return 0;
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} /* end afs_dir_open() */
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/*****************************************************************************/
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/*
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* deal with one block in an AFS directory
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*/
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static int afs_dir_iterate_block(unsigned *fpos,
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union afs_dir_block *block,
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unsigned blkoff,
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void *cookie,
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filldir_t filldir)
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{
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union afs_dirent *dire;
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unsigned offset, next, curr;
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size_t nlen;
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int tmp, ret;
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_enter("%u,%x,%p,,",*fpos,blkoff,block);
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curr = (*fpos - blkoff) / sizeof(union afs_dirent);
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/* walk through the block, an entry at a time */
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for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
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offset < AFS_DIRENT_PER_BLOCK;
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offset = next
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) {
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next = offset + 1;
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/* skip entries marked unused in the bitmap */
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if (!(block->pagehdr.bitmap[offset / 8] &
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(1 << (offset % 8)))) {
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_debug("ENT[%Zu.%u]: unused\n",
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blkoff / sizeof(union afs_dir_block), offset);
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if (offset >= curr)
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*fpos = blkoff +
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next * sizeof(union afs_dirent);
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continue;
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}
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/* got a valid entry */
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dire = &block->dirents[offset];
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nlen = strnlen(dire->u.name,
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sizeof(*block) -
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offset * sizeof(union afs_dirent));
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_debug("ENT[%Zu.%u]: %s %Zu \"%s\"\n",
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blkoff / sizeof(union afs_dir_block), offset,
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(offset < curr ? "skip" : "fill"),
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nlen, dire->u.name);
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/* work out where the next possible entry is */
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for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
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if (next >= AFS_DIRENT_PER_BLOCK) {
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_debug("ENT[%Zu.%u]:"
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" %u travelled beyond end dir block"
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" (len %u/%Zu)\n",
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blkoff / sizeof(union afs_dir_block),
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offset, next, tmp, nlen);
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return -EIO;
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}
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if (!(block->pagehdr.bitmap[next / 8] &
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(1 << (next % 8)))) {
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_debug("ENT[%Zu.%u]:"
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" %u unmarked extension (len %u/%Zu)\n",
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blkoff / sizeof(union afs_dir_block),
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offset, next, tmp, nlen);
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return -EIO;
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}
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_debug("ENT[%Zu.%u]: ext %u/%Zu\n",
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blkoff / sizeof(union afs_dir_block),
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next, tmp, nlen);
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next++;
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}
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/* skip if starts before the current position */
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if (offset < curr)
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continue;
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/* found the next entry */
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ret = filldir(cookie,
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dire->u.name,
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nlen,
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blkoff + offset * sizeof(union afs_dirent),
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ntohl(dire->u.vnode),
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filldir == afs_dir_lookup_filldir ?
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ntohl(dire->u.unique) : DT_UNKNOWN);
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if (ret < 0) {
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_leave(" = 0 [full]");
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return 0;
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}
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*fpos = blkoff + next * sizeof(union afs_dirent);
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}
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_leave(" = 1 [more]");
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return 1;
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} /* end afs_dir_iterate_block() */
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/*****************************************************************************/
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/*
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* read an AFS directory
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*/
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static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
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filldir_t filldir)
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{
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union afs_dir_block *dblock;
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struct afs_dir_page *dbuf;
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struct page *page;
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unsigned blkoff, limit;
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int ret;
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_enter("{%lu},%u,,", dir->i_ino, *fpos);
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if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
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_leave(" = -ESTALE");
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return -ESTALE;
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}
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/* round the file position up to the next entry boundary */
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*fpos += sizeof(union afs_dirent) - 1;
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*fpos &= ~(sizeof(union afs_dirent) - 1);
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/* walk through the blocks in sequence */
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ret = 0;
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while (*fpos < dir->i_size) {
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blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1);
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/* fetch the appropriate page from the directory */
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page = afs_dir_get_page(dir, blkoff / PAGE_SIZE);
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if (IS_ERR(page)) {
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ret = PTR_ERR(page);
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break;
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}
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limit = blkoff & ~(PAGE_SIZE - 1);
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dbuf = page_address(page);
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/* deal with the individual blocks stashed on this page */
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do {
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dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
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sizeof(union afs_dir_block)];
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ret = afs_dir_iterate_block(fpos, dblock, blkoff,
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cookie, filldir);
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if (ret != 1) {
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afs_dir_put_page(page);
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goto out;
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}
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blkoff += sizeof(union afs_dir_block);
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} while (*fpos < dir->i_size && blkoff < limit);
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afs_dir_put_page(page);
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ret = 0;
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}
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out:
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_leave(" = %d", ret);
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return ret;
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} /* end afs_dir_iterate() */
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/*****************************************************************************/
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/*
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* read an AFS directory
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*/
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static int afs_dir_readdir(struct file *file, void *cookie, filldir_t filldir)
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{
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unsigned fpos;
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int ret;
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_enter("{%Ld,{%lu}}", file->f_pos, file->f_dentry->d_inode->i_ino);
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fpos = file->f_pos;
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ret = afs_dir_iterate(file->f_dentry->d_inode, &fpos, cookie, filldir);
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file->f_pos = fpos;
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_leave(" = %d", ret);
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return ret;
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} /* end afs_dir_readdir() */
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/*****************************************************************************/
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/*
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* search the directory for a name
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* - if afs_dir_iterate_block() spots this function, it'll pass the FID
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* uniquifier through dtype
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*/
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static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
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loff_t fpos, ino_t ino, unsigned dtype)
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{
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struct afs_dir_lookup_cookie *cookie = _cookie;
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_enter("{%s,%Zu},%s,%u,,%lu,%u",
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cookie->name, cookie->nlen, name, nlen, ino, dtype);
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if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) {
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_leave(" = 0 [no]");
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return 0;
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}
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cookie->fid.vnode = ino;
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cookie->fid.unique = dtype;
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cookie->found = 1;
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_leave(" = -1 [found]");
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return -1;
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} /* end afs_dir_lookup_filldir() */
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/*****************************************************************************/
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/*
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* look up an entry in a directory
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*/
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static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct afs_dir_lookup_cookie cookie;
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struct afs_super_info *as;
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struct afs_vnode *vnode;
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struct inode *inode;
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unsigned fpos;
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int ret;
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_enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
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/* insanity checks first */
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BUG_ON(sizeof(union afs_dir_block) != 2048);
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BUG_ON(sizeof(union afs_dirent) != 32);
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if (dentry->d_name.len > 255) {
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_leave(" = -ENAMETOOLONG");
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return ERR_PTR(-ENAMETOOLONG);
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}
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vnode = AFS_FS_I(dir);
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if (vnode->flags & AFS_VNODE_DELETED) {
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_leave(" = -ESTALE");
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return ERR_PTR(-ESTALE);
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}
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as = dir->i_sb->s_fs_info;
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/* search the directory */
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cookie.name = dentry->d_name.name;
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cookie.nlen = dentry->d_name.len;
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cookie.fid.vid = as->volume->vid;
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cookie.found = 0;
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fpos = 0;
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ret = afs_dir_iterate(dir, &fpos, &cookie, afs_dir_lookup_filldir);
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if (ret < 0) {
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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ret = -ENOENT;
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if (!cookie.found) {
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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/* instantiate the dentry */
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ret = afs_iget(dir->i_sb, &cookie.fid, &inode);
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if (ret < 0) {
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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dentry->d_op = &afs_fs_dentry_operations;
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dentry->d_fsdata = (void *) (unsigned long) vnode->status.version;
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d_add(dentry, inode);
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_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }",
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cookie.fid.vnode,
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cookie.fid.unique,
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dentry->d_inode->i_ino,
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dentry->d_inode->i_version);
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return NULL;
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} /* end afs_dir_lookup() */
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/*****************************************************************************/
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/*
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* check that a dentry lookup hit has found a valid entry
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* - NOTE! the hit can be a negative hit too, so we can't assume we have an
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* inode
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* (derived from nfs_lookup_revalidate)
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*/
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static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
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{
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struct afs_dir_lookup_cookie cookie;
|
|
struct dentry *parent;
|
|
struct inode *inode, *dir;
|
|
unsigned fpos;
|
|
int ret;
|
|
|
|
_enter("{sb=%p n=%s},", dentry->d_sb, dentry->d_name.name);
|
|
|
|
/* lock down the parent dentry so we can peer at it */
|
|
parent = dget_parent(dentry->d_parent);
|
|
|
|
dir = parent->d_inode;
|
|
inode = dentry->d_inode;
|
|
|
|
/* handle a negative dentry */
|
|
if (!inode)
|
|
goto out_bad;
|
|
|
|
/* handle a bad inode */
|
|
if (is_bad_inode(inode)) {
|
|
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
goto out_bad;
|
|
}
|
|
|
|
/* force a full look up if the parent directory changed since last the
|
|
* server was consulted
|
|
* - otherwise this inode must still exist, even if the inode details
|
|
* themselves have changed
|
|
*/
|
|
if (AFS_FS_I(dir)->flags & AFS_VNODE_CHANGED)
|
|
afs_vnode_fetch_status(AFS_FS_I(dir));
|
|
|
|
if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
|
|
_debug("%s: parent dir deleted", dentry->d_name.name);
|
|
goto out_bad;
|
|
}
|
|
|
|
if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) {
|
|
_debug("%s: file already deleted", dentry->d_name.name);
|
|
goto out_bad;
|
|
}
|
|
|
|
if ((unsigned long) dentry->d_fsdata !=
|
|
(unsigned long) AFS_FS_I(dir)->status.version) {
|
|
_debug("%s: parent changed %lu -> %u",
|
|
dentry->d_name.name,
|
|
(unsigned long) dentry->d_fsdata,
|
|
(unsigned) AFS_FS_I(dir)->status.version);
|
|
|
|
/* search the directory for this vnode */
|
|
cookie.name = dentry->d_name.name;
|
|
cookie.nlen = dentry->d_name.len;
|
|
cookie.fid.vid = AFS_FS_I(inode)->volume->vid;
|
|
cookie.found = 0;
|
|
|
|
fpos = 0;
|
|
ret = afs_dir_iterate(dir, &fpos, &cookie,
|
|
afs_dir_lookup_filldir);
|
|
if (ret < 0) {
|
|
_debug("failed to iterate dir %s: %d",
|
|
parent->d_name.name, ret);
|
|
goto out_bad;
|
|
}
|
|
|
|
if (!cookie.found) {
|
|
_debug("%s: dirent not found", dentry->d_name.name);
|
|
goto not_found;
|
|
}
|
|
|
|
/* if the vnode ID has changed, then the dirent points to a
|
|
* different file */
|
|
if (cookie.fid.vnode != AFS_FS_I(inode)->fid.vnode) {
|
|
_debug("%s: dirent changed", dentry->d_name.name);
|
|
goto not_found;
|
|
}
|
|
|
|
/* if the vnode ID uniqifier has changed, then the file has
|
|
* been deleted */
|
|
if (cookie.fid.unique != AFS_FS_I(inode)->fid.unique) {
|
|
_debug("%s: file deleted (uq %u -> %u I:%lu)",
|
|
dentry->d_name.name,
|
|
cookie.fid.unique,
|
|
AFS_FS_I(inode)->fid.unique,
|
|
inode->i_version);
|
|
spin_lock(&AFS_FS_I(inode)->lock);
|
|
AFS_FS_I(inode)->flags |= AFS_VNODE_DELETED;
|
|
spin_unlock(&AFS_FS_I(inode)->lock);
|
|
invalidate_remote_inode(inode);
|
|
goto out_bad;
|
|
}
|
|
|
|
dentry->d_fsdata =
|
|
(void *) (unsigned long) AFS_FS_I(dir)->status.version;
|
|
}
|
|
|
|
out_valid:
|
|
dput(parent);
|
|
_leave(" = 1 [valid]");
|
|
return 1;
|
|
|
|
/* the dirent, if it exists, now points to a different vnode */
|
|
not_found:
|
|
spin_lock(&dentry->d_lock);
|
|
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
out_bad:
|
|
if (inode) {
|
|
/* don't unhash if we have submounts */
|
|
if (have_submounts(dentry))
|
|
goto out_valid;
|
|
}
|
|
|
|
shrink_dcache_parent(dentry);
|
|
|
|
_debug("dropping dentry %s/%s",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
d_drop(dentry);
|
|
|
|
dput(parent);
|
|
|
|
_leave(" = 0 [bad]");
|
|
return 0;
|
|
} /* end afs_d_revalidate() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
|
|
* sleep)
|
|
* - called from dput() when d_count is going to 0.
|
|
* - return 1 to request dentry be unhashed, 0 otherwise
|
|
*/
|
|
static int afs_d_delete(struct dentry *dentry)
|
|
{
|
|
_enter("%s", dentry->d_name.name);
|
|
|
|
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
goto zap;
|
|
|
|
if (dentry->d_inode) {
|
|
if (AFS_FS_I(dentry->d_inode)->flags & AFS_VNODE_DELETED)
|
|
goto zap;
|
|
}
|
|
|
|
_leave(" = 0 [keep]");
|
|
return 0;
|
|
|
|
zap:
|
|
_leave(" = 1 [zap]");
|
|
return 1;
|
|
} /* end afs_d_delete() */
|