![David Howells](/assets/img/avatar_default.png)
Support the AFS dynamic root which is a pseudo-volume that doesn't connect to any server resource, but rather is just a root directory that dynamically creates mountpoint directories where the name of such a directory is the name of the cell. Such a mount can be created thus: mount -t afs none /afs -o dyn Dynamic root superblocks aren't shared except by bind mounts and propagation. Cell root volumes can then be mounted by referring to them by name, e.g.: ls /afs/grand.central.org/ ls /afs/.grand.central.org/ The kernel will upcall to consult the DNS if the address wasn't supplied directly. Signed-off-by: David Howells <dhowells@redhat.com>
1331 lines
31 KiB
C
1331 lines
31 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/fs.h>
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#include <linux/namei.h>
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#include <linux/pagemap.h>
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#include <linux/ctype.h>
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#include <linux/sched.h>
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#include <linux/dns_resolver.h>
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#include "internal.h"
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static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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static int afs_dir_open(struct inode *inode, struct file *file);
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static int afs_readdir(struct file *file, struct dir_context *ctx);
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static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
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static int afs_d_delete(const struct dentry *dentry);
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static void afs_d_release(struct dentry *dentry);
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static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
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loff_t fpos, u64 ino, unsigned dtype);
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static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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bool excl);
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static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
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static int afs_rmdir(struct inode *dir, struct dentry *dentry);
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static int afs_unlink(struct inode *dir, struct dentry *dentry);
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static int afs_link(struct dentry *from, struct inode *dir,
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struct dentry *dentry);
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static int afs_symlink(struct inode *dir, struct dentry *dentry,
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const char *content);
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static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags);
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const struct file_operations afs_dir_file_operations = {
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.open = afs_dir_open,
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.release = afs_release,
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.iterate_shared = afs_readdir,
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.lock = afs_lock,
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.llseek = generic_file_llseek,
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};
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const struct inode_operations afs_dir_inode_operations = {
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.create = afs_create,
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.lookup = afs_lookup,
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.link = afs_link,
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.unlink = afs_unlink,
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.symlink = afs_symlink,
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.mkdir = afs_mkdir,
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.rmdir = afs_rmdir,
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.rename = afs_rename,
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.permission = afs_permission,
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.getattr = afs_getattr,
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.setattr = afs_setattr,
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.listxattr = afs_listxattr,
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};
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const struct file_operations afs_dynroot_file_operations = {
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.open = dcache_dir_open,
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.release = dcache_dir_close,
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.iterate_shared = dcache_readdir,
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.llseek = dcache_dir_lseek,
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};
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const struct inode_operations afs_dynroot_inode_operations = {
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.lookup = afs_dynroot_lookup,
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};
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const 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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.d_release = afs_d_release,
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.d_automount = afs_d_automount,
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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_lookup_cookie {
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struct dir_context ctx;
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struct afs_fid fid;
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struct qstr name;
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int found;
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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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bool 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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struct afs_vnode *vnode = AFS_FS_I(dir);
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loff_t latter, i_size, off;
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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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__func__, dir->i_ino, qty,
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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, but
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* we must take care because the directory may change size under us.
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*/
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off = page_offset(page);
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i_size = i_size_read(dir);
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if (i_size <= off)
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goto checked;
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latter = i_size - off;
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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(%lx): bad magic %d/%d is %04hx\n",
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__func__, dir->i_ino, tmp, qty,
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ntohs(dbuf->blocks[tmp].pagehdr.magic));
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trace_afs_dir_check_failed(vnode, off, i_size);
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goto error;
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}
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}
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checked:
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SetPageChecked(page);
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return true;
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error:
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SetPageError(page);
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return false;
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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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unlock_page(page);
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put_page(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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struct key *key)
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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, afs_page_filler, key);
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if (!IS_ERR(page)) {
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lock_page(page);
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kmap(page);
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if (unlikely(!PageChecked(page))) {
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if (PageError(page))
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goto fail;
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}
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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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_leave(" = -EIO");
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return ERR_PTR(-EIO);
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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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BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
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BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
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return -ENOENT;
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return afs_open(inode, file);
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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(struct dir_context *ctx,
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union afs_dir_block *block,
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unsigned blkoff)
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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;
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_enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
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curr = (ctx->pos - 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",
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blkoff / sizeof(union afs_dir_block), offset);
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if (offset >= curr)
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ctx->pos = 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\"",
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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)",
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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)",
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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",
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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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if (!dir_emit(ctx, dire->u.name, nlen,
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ntohl(dire->u.vnode),
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ctx->actor == afs_lookup_filldir ?
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ntohl(dire->u.unique) : DT_UNKNOWN)) {
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_leave(" = 0 [full]");
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return 0;
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}
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ctx->pos = 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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}
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/*
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* iterate through the data blob that lists the contents of an AFS directory
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*/
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static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
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struct key *key)
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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, (unsigned)ctx->pos);
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
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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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ctx->pos += sizeof(union afs_dirent) - 1;
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ctx->pos &= ~(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 (ctx->pos < dir->i_size) {
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blkoff = ctx->pos & ~(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, key);
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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(ctx, dblock, blkoff);
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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 (ctx->pos < 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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}
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/*
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* read an AFS directory
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*/
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static int afs_readdir(struct file *file, struct dir_context *ctx)
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{
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return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file));
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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_lookup_filldir(struct dir_context *ctx, const char *name,
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int nlen, loff_t fpos, u64 ino, unsigned dtype)
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{
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struct afs_lookup_cookie *cookie =
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container_of(ctx, struct afs_lookup_cookie, ctx);
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_enter("{%s,%u},%s,%u,,%llu,%u",
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cookie->name.name, cookie->name.len, name, nlen,
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(unsigned long long) ino, dtype);
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/* insanity checks first */
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BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
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BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
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if (cookie->name.len != nlen ||
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memcmp(cookie->name.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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}
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|
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/*
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* do a lookup in a directory
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* - just returns the FID the dentry name maps to if found
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*/
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static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
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struct afs_fid *fid, struct key *key)
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{
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struct afs_super_info *as = dir->i_sb->s_fs_info;
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struct afs_lookup_cookie cookie = {
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.ctx.actor = afs_lookup_filldir,
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.name = dentry->d_name,
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.fid.vid = as->volume->vid
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};
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int ret;
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_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
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/* search the directory */
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ret = afs_dir_iterate(dir, &cookie.ctx, key);
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if (ret < 0) {
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_leave(" = %d [iter]", ret);
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return ret;
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}
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ret = -ENOENT;
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if (!cookie.found) {
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_leave(" = -ENOENT [not found]");
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return -ENOENT;
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}
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*fid = cookie.fid;
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_leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
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return 0;
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}
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/*
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* Probe to see if a cell may exist. This prevents positive dentries from
|
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* being created unnecessarily.
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*/
|
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static int afs_probe_cell_name(struct dentry *dentry)
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{
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struct afs_cell *cell;
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const char *name = dentry->d_name.name;
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size_t len = dentry->d_name.len;
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int ret;
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/* Names prefixed with a dot are R/W mounts. */
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if (name[0] == '.') {
|
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if (len == 1)
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return -EINVAL;
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name++;
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len--;
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}
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|
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cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len);
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if (!IS_ERR(cell)) {
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afs_put_cell(afs_d2net(dentry), cell);
|
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return 0;
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}
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|
|
ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL);
|
|
if (ret == -ENODATA)
|
|
ret = -EDESTADDRREQ;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Try to auto mount the mountpoint with pseudo directory, if the autocell
|
|
* operation is setted.
|
|
*/
|
|
static struct inode *afs_try_auto_mntpt(struct dentry *dentry,
|
|
struct inode *dir, struct afs_fid *fid)
|
|
{
|
|
struct afs_vnode *vnode = AFS_FS_I(dir);
|
|
struct inode *inode;
|
|
int ret = -ENOENT;
|
|
|
|
_enter("%p{%pd}, {%x:%u}",
|
|
dentry, dentry, vnode->fid.vid, vnode->fid.vnode);
|
|
|
|
if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
|
|
goto out;
|
|
|
|
ret = afs_probe_cell_name(dentry);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
inode = afs_iget_pseudo_dir(dir->i_sb, false);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
goto out;
|
|
}
|
|
|
|
*fid = AFS_FS_I(inode)->fid;
|
|
_leave("= %p", inode);
|
|
return inode;
|
|
|
|
out:
|
|
_leave("= %d", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* look up an entry in a directory
|
|
*/
|
|
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},%p{%pd},",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry, dentry);
|
|
|
|
ASSERTCMP(d_inode(dentry), ==, NULL);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX) {
|
|
_leave(" = -ENAMETOOLONG");
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
|
|
_leave(" = -ESTALE");
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
key = afs_request_key(vnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
_leave(" = %ld [key]", PTR_ERR(key));
|
|
return ERR_CAST(key);
|
|
}
|
|
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
_leave(" = %d [val]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ret = afs_do_lookup(dir, dentry, &fid, key);
|
|
if (ret < 0) {
|
|
if (ret == -ENOENT) {
|
|
inode = afs_try_auto_mntpt(dentry, dir, &fid);
|
|
if (!IS_ERR(inode)) {
|
|
key_put(key);
|
|
goto success;
|
|
}
|
|
|
|
ret = PTR_ERR(inode);
|
|
}
|
|
|
|
key_put(key);
|
|
if (ret == -ENOENT) {
|
|
d_add(dentry, NULL);
|
|
_leave(" = NULL [negative]");
|
|
return NULL;
|
|
}
|
|
_leave(" = %d [do]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
|
|
|
|
/* instantiate the dentry */
|
|
inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL, NULL);
|
|
key_put(key);
|
|
if (IS_ERR(inode)) {
|
|
_leave(" = %ld", PTR_ERR(inode));
|
|
return ERR_CAST(inode);
|
|
}
|
|
|
|
success:
|
|
d_add(dentry, inode);
|
|
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
|
|
fid.vnode,
|
|
fid.unique,
|
|
d_inode(dentry)->i_ino,
|
|
d_inode(dentry)->i_generation);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Look up an entry in a dynroot directory.
|
|
*/
|
|
static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(dir);
|
|
|
|
_enter("%pd", dentry);
|
|
|
|
ASSERTCMP(d_inode(dentry), ==, NULL);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX) {
|
|
_leave(" = -ENAMETOOLONG");
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
}
|
|
|
|
inode = afs_try_auto_mntpt(dentry, dir, &fid);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
if (ret == -ENOENT) {
|
|
d_add(dentry, NULL);
|
|
_leave(" = NULL [negative]");
|
|
return NULL;
|
|
}
|
|
_leave(" = %d [do]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
d_add(dentry, inode);
|
|
_leave(" = 0 { ino=%lu v=%u }",
|
|
d_inode(dentry)->i_ino, d_inode(dentry)->i_generation);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* check that a dentry lookup hit has found a valid entry
|
|
* - NOTE! the hit can be a negative hit too, so we can't assume we have an
|
|
* inode
|
|
*/
|
|
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct afs_super_info *as = dentry->d_sb->s_fs_info;
|
|
struct afs_vnode *vnode, *dir;
|
|
struct afs_fid uninitialized_var(fid);
|
|
struct dentry *parent;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
void *dir_version;
|
|
int ret;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
if (as->dyn_root)
|
|
return 1;
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
vnode = AFS_FS_I(d_inode(dentry));
|
|
_enter("{v={%x:%u} n=%pd fl=%lx},",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry,
|
|
vnode->flags);
|
|
} else {
|
|
_enter("{neg n=%pd}", dentry);
|
|
}
|
|
|
|
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
|
|
if (IS_ERR(key))
|
|
key = NULL;
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
inode = d_inode(dentry);
|
|
if (inode) {
|
|
vnode = AFS_FS_I(inode);
|
|
afs_validate(vnode, key);
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
goto out_bad;
|
|
}
|
|
}
|
|
|
|
/* lock down the parent dentry so we can peer at it */
|
|
parent = dget_parent(dentry);
|
|
dir = AFS_FS_I(d_inode(parent));
|
|
|
|
/* validate the parent directory */
|
|
afs_validate(dir, key);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
|
|
_debug("%pd: parent dir deleted", dentry);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
dir_version = (void *) (unsigned long) dir->status.data_version;
|
|
if (dentry->d_fsdata == dir_version)
|
|
goto out_valid; /* the dir contents are unchanged */
|
|
|
|
_debug("dir modified");
|
|
|
|
/* search the directory for this vnode */
|
|
ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
|
|
switch (ret) {
|
|
case 0:
|
|
/* the filename maps to something */
|
|
if (d_really_is_negative(dentry))
|
|
goto out_bad_parent;
|
|
inode = d_inode(dentry);
|
|
if (is_bad_inode(inode)) {
|
|
printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
|
|
dentry);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
/* if the vnode ID has changed, then the dirent points to a
|
|
* different file */
|
|
if (fid.vnode != vnode->fid.vnode) {
|
|
_debug("%pd: dirent changed [%u != %u]",
|
|
dentry, fid.vnode,
|
|
vnode->fid.vnode);
|
|
goto not_found;
|
|
}
|
|
|
|
/* if the vnode ID uniqifier has changed, then the file has
|
|
* been deleted and replaced, and the original vnode ID has
|
|
* been reused */
|
|
if (fid.unique != vnode->fid.unique) {
|
|
_debug("%pd: file deleted (uq %u -> %u I:%u)",
|
|
dentry, fid.unique,
|
|
vnode->fid.unique,
|
|
vnode->vfs_inode.i_generation);
|
|
write_seqlock(&vnode->cb_lock);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
write_sequnlock(&vnode->cb_lock);
|
|
goto not_found;
|
|
}
|
|
goto out_valid;
|
|
|
|
case -ENOENT:
|
|
/* the filename is unknown */
|
|
_debug("%pd: dirent not found", dentry);
|
|
if (d_really_is_positive(dentry))
|
|
goto not_found;
|
|
goto out_valid;
|
|
|
|
default:
|
|
_debug("failed to iterate dir %pd: %d",
|
|
parent, ret);
|
|
goto out_bad_parent;
|
|
}
|
|
|
|
out_valid:
|
|
dentry->d_fsdata = dir_version;
|
|
dput(parent);
|
|
key_put(key);
|
|
_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_parent:
|
|
_debug("dropping dentry %pd2", dentry);
|
|
dput(parent);
|
|
out_bad:
|
|
key_put(key);
|
|
|
|
_leave(" = 0 [bad]");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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(const struct dentry *dentry)
|
|
{
|
|
_enter("%pd", dentry);
|
|
|
|
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
goto zap;
|
|
|
|
if (d_really_is_positive(dentry) &&
|
|
(test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
|
|
test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
|
|
goto zap;
|
|
|
|
_leave(" = 0 [keep]");
|
|
return 0;
|
|
|
|
zap:
|
|
_leave(" = 1 [zap]");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* handle dentry release
|
|
*/
|
|
static void afs_d_release(struct dentry *dentry)
|
|
{
|
|
_enter("%pd", dentry);
|
|
}
|
|
|
|
/*
|
|
* Create a new inode for create/mkdir/symlink
|
|
*/
|
|
static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
|
|
struct dentry *new_dentry,
|
|
struct afs_fid *newfid,
|
|
struct afs_file_status *newstatus,
|
|
struct afs_callback *newcb)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (fc->ac.error < 0)
|
|
return;
|
|
|
|
d_drop(new_dentry);
|
|
|
|
inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
|
|
newfid, newstatus, newcb, fc->cbi);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM or EINTR at a really inconvenient time - just abandon
|
|
* the new directory on the server.
|
|
*/
|
|
fc->ac.error = PTR_ERR(inode);
|
|
return;
|
|
}
|
|
|
|
d_add(new_dentry, inode);
|
|
}
|
|
|
|
/*
|
|
* create a directory on an AFS filesystem
|
|
*/
|
|
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct afs_file_status newstatus;
|
|
struct afs_fs_cursor fc;
|
|
struct afs_callback newcb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_fid newfid;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
mode |= S_IFDIR;
|
|
|
|
_enter("{%x:%u},{%pd},%ho",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
afs_fs_create(&fc, dentry->d_name.name, mode,
|
|
&newfid, &newstatus, &newcb);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, fc.vnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a subdir from a directory.
|
|
*/
|
|
static void afs_dir_remove_subdir(struct dentry *dentry)
|
|
{
|
|
if (d_really_is_positive(dentry)) {
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
|
|
clear_nlink(&vnode->vfs_inode);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* remove a directory from an AFS filesystem
|
|
*/
|
|
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%x:%u},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
afs_fs_remove(&fc, dentry->d_name.name, true);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret == 0)
|
|
afs_dir_remove_subdir(dentry);
|
|
}
|
|
|
|
key_put(key);
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a link to a file or symlink from a directory.
|
|
*
|
|
* If the file was not deleted due to excess hard links, the fileserver will
|
|
* break the callback promise on the file - if it had one - before it returns
|
|
* to us, and if it was deleted, it won't
|
|
*
|
|
* However, if we didn't have a callback promise outstanding, or it was
|
|
* outstanding on a different server, then it won't break it either...
|
|
*/
|
|
static int afs_dir_remove_link(struct dentry *dentry, struct key *key,
|
|
unsigned long d_version_before,
|
|
unsigned long d_version_after)
|
|
{
|
|
bool dir_valid;
|
|
int ret = 0;
|
|
|
|
/* There were no intervening changes on the server if the version
|
|
* number we got back was incremented by exactly 1.
|
|
*/
|
|
dir_valid = (d_version_after == d_version_before + 1);
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
|
|
if (dir_valid) {
|
|
drop_nlink(&vnode->vfs_inode);
|
|
if (vnode->vfs_inode.i_nlink == 0) {
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
|
}
|
|
ret = 0;
|
|
} else {
|
|
clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
kdebug("AFS_VNODE_DELETED");
|
|
|
|
ret = afs_validate(vnode, key);
|
|
if (ret == -ESTALE)
|
|
ret = 0;
|
|
}
|
|
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove a file or symlink from an AFS filesystem.
|
|
*/
|
|
static int afs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
|
|
struct key *key;
|
|
unsigned long d_version = (unsigned long)dentry->d_fsdata;
|
|
int ret;
|
|
|
|
_enter("{%x:%u},{%pd}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
return -ENAMETOOLONG;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
/* Try to make sure we have a callback promise on the victim. */
|
|
if (d_really_is_positive(dentry)) {
|
|
vnode = AFS_FS_I(d_inode(dentry));
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
afs_fs_remove(&fc, dentry->d_name.name, false);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret == 0)
|
|
ret = afs_dir_remove_link(
|
|
dentry, key, d_version,
|
|
(unsigned long)dvnode->status.data_version);
|
|
}
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a regular file on an AFS filesystem
|
|
*/
|
|
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_file_status newstatus;
|
|
struct afs_callback newcb;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_fid newfid;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
mode |= S_IFREG;
|
|
|
|
_enter("{%x:%u},{%pd},%ho,",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
afs_fs_create(&fc, dentry->d_name.name, mode,
|
|
&newfid, &newstatus, &newcb);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, fc.vnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a hard link between files in an AFS filesystem
|
|
*/
|
|
static int afs_link(struct dentry *from, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(d_inode(from));
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%x:%u},{%pd}",
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
dvnode->fid.vid, dvnode->fid.vnode,
|
|
dentry);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
|
|
afs_end_vnode_operation(&fc);
|
|
goto error_key;
|
|
}
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break;
|
|
afs_fs_link(&fc, vnode, dentry->d_name.name);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
|
|
ihold(&vnode->vfs_inode);
|
|
d_instantiate(dentry, &vnode->vfs_inode);
|
|
|
|
mutex_unlock(&vnode->io_lock);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a symlink in an AFS filesystem
|
|
*/
|
|
static int afs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *content)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_file_status newstatus;
|
|
struct afs_vnode *dvnode = AFS_FS_I(dir);
|
|
struct afs_fid newfid;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
_enter("{%x:%u},{%pd},%s",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry,
|
|
content);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
ret = -EINVAL;
|
|
if (strlen(content) >= AFSPATHMAX)
|
|
goto error;
|
|
|
|
key = afs_request_key(dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, dvnode, key)) {
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
|
|
afs_fs_symlink(&fc, dentry->d_name.name, content,
|
|
&newfid, &newstatus);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, fc.vnode);
|
|
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
|
|
afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
} else {
|
|
goto error_key;
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* rename a file in an AFS filesystem and/or move it between directories
|
|
*/
|
|
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
vnode = AFS_FS_I(d_inode(old_dentry));
|
|
orig_dvnode = AFS_FS_I(old_dir);
|
|
new_dvnode = AFS_FS_I(new_dir);
|
|
|
|
_enter("{%x:%u},{%x:%u},{%x:%u},{%pd}",
|
|
orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
new_dvnode->fid.vid, new_dvnode->fid.vnode,
|
|
new_dentry);
|
|
|
|
key = afs_request_key(orig_dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
|
|
if (orig_dvnode != new_dvnode) {
|
|
if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
|
|
afs_end_vnode_operation(&fc);
|
|
goto error_key;
|
|
}
|
|
}
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break;
|
|
fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break;
|
|
afs_fs_rename(&fc, old_dentry->d_name.name,
|
|
new_dvnode, new_dentry->d_name.name);
|
|
}
|
|
|
|
afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
|
|
afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
|
|
if (orig_dvnode != new_dvnode)
|
|
mutex_unlock(&new_dvnode->io_lock);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
if (ret < 0)
|
|
goto error_key;
|
|
}
|
|
|
|
error_key:
|
|
key_put(key);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|