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![David Howells](/assets/img/avatar_default.png)
Turn the afs_operation struct into the main way that most fileserver operations are managed. Various things are added to the struct, including the following: (1) All the parameters and results of the relevant operations are moved into it, removing corresponding fields from the afs_call struct. afs_call gets a pointer to the op. (2) The target volume is made the main focus of the operation, rather than the target vnode(s), and a bunch of op->vnode->volume are made op->volume instead. (3) Two vnode records are defined (op->file[]) for the vnode(s) involved in most operations. The vnode record (struct afs_vnode_param) contains: - The vnode pointer. - The fid of the vnode to be included in the parameters or that was returned in the reply (eg. FS.MakeDir). - The status and callback information that may be returned in the reply about the vnode. - Callback break and data version tracking for detecting simultaneous third-parth changes. (4) Pointers to dentries to be updated with new inodes. (5) An operations table pointer. The table includes pointers to functions for issuing AFS and YFS-variant RPCs, handling the success and abort of an operation and handling post-I/O-lock local editing of a directory. To make this work, the following function restructuring is made: (A) The rotation loop that issues calls to fileservers that can be found in each function that wants to issue an RPC (such as afs_mkdir()) is extracted out into common code, in a new file called fs_operation.c. (B) The rotation loops, such as the one in afs_mkdir(), are replaced with a much smaller piece of code that allocates an operation, sets the parameters and then calls out to the common code to do the actual work. (C) The code for handling the success and failure of an operation are moved into operation functions (as (5) above) and these are called from the core code at appropriate times. (D) The pseudo inode getting stuff used by the dynamic root code is moved over into dynroot.c. (E) struct afs_iget_data is absorbed into the operation struct and afs_iget() expects to be given an op pointer and a vnode record. (F) Point (E) doesn't work for the root dir of a volume, but we know the FID in advance (it's always vnode 1, unique 1), so a separate inode getter, afs_root_iget(), is provided to special-case that. (G) The inode status init/update functions now also take an op and a vnode record. (H) The RPC marshalling functions now, for the most part, just take an afs_operation struct as their only argument. All the data they need is held there. The result delivery functions write their answers there as well. (I) The call is attached to the operation and then the operation core does the waiting. And then the new operation code is, for the moment, made to just initialise the operation, get the appropriate vnode I/O locks and do the same rotation loop as before. This lays the foundation for the following changes in the future: (*) Overhauling the rotation (again). (*) Support for asynchronous I/O, where the fileserver rotation must be done asynchronously also. Signed-off-by: David Howells <dhowells@redhat.com>
686 lines
15 KiB
C
686 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS filesystem file handling
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*
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* Copyright (C) 2002, 2007 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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#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/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/gfp.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/mm.h>
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#include "internal.h"
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static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
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static int afs_readpage(struct file *file, struct page *page);
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static void afs_invalidatepage(struct page *page, unsigned int offset,
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unsigned int length);
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static int afs_releasepage(struct page *page, gfp_t gfp_flags);
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static int afs_readpages(struct file *filp, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages);
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const struct file_operations afs_file_operations = {
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.open = afs_open,
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.release = afs_release,
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.write_iter = afs_file_write,
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.mmap = afs_file_mmap,
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.splice_read = generic_file_splice_read,
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.fsync = afs_fsync,
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.lock = afs_lock,
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.flock = afs_flock,
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};
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const struct inode_operations afs_file_inode_operations = {
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.getattr = afs_getattr,
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.setattr = afs_setattr,
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.permission = afs_permission,
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.listxattr = afs_listxattr,
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};
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const struct address_space_operations afs_fs_aops = {
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.readpage = afs_readpage,
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.readpages = afs_readpages,
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.set_page_dirty = afs_set_page_dirty,
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.launder_page = afs_launder_page,
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.releasepage = afs_releasepage,
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.invalidatepage = afs_invalidatepage,
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.write_begin = afs_write_begin,
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.write_end = afs_write_end,
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.writepage = afs_writepage,
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.writepages = afs_writepages,
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};
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static const struct vm_operations_struct afs_vm_ops = {
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.fault = filemap_fault,
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.map_pages = filemap_map_pages,
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.page_mkwrite = afs_page_mkwrite,
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};
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/*
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* Discard a pin on a writeback key.
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*/
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void afs_put_wb_key(struct afs_wb_key *wbk)
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{
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if (wbk && refcount_dec_and_test(&wbk->usage)) {
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key_put(wbk->key);
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kfree(wbk);
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}
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}
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/*
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* Cache key for writeback.
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*/
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int afs_cache_wb_key(struct afs_vnode *vnode, struct afs_file *af)
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{
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struct afs_wb_key *wbk, *p;
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wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL);
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if (!wbk)
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return -ENOMEM;
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refcount_set(&wbk->usage, 2);
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wbk->key = af->key;
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spin_lock(&vnode->wb_lock);
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list_for_each_entry(p, &vnode->wb_keys, vnode_link) {
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if (p->key == wbk->key)
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goto found;
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}
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key_get(wbk->key);
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list_add_tail(&wbk->vnode_link, &vnode->wb_keys);
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spin_unlock(&vnode->wb_lock);
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af->wb = wbk;
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return 0;
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found:
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refcount_inc(&p->usage);
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spin_unlock(&vnode->wb_lock);
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af->wb = p;
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kfree(wbk);
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return 0;
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}
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/*
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* open an AFS file or directory and attach a key to it
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*/
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int afs_open(struct inode *inode, struct file *file)
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{
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struct afs_vnode *vnode = AFS_FS_I(inode);
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struct afs_file *af;
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struct key *key;
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int ret;
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_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
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key = afs_request_key(vnode->volume->cell);
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if (IS_ERR(key)) {
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ret = PTR_ERR(key);
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goto error;
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}
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af = kzalloc(sizeof(*af), GFP_KERNEL);
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if (!af) {
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ret = -ENOMEM;
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goto error_key;
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}
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af->key = key;
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ret = afs_validate(vnode, key);
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if (ret < 0)
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goto error_af;
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if (file->f_mode & FMODE_WRITE) {
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ret = afs_cache_wb_key(vnode, af);
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if (ret < 0)
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goto error_af;
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}
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if (file->f_flags & O_TRUNC)
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set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
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file->private_data = af;
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_leave(" = 0");
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return 0;
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error_af:
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kfree(af);
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error_key:
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key_put(key);
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error:
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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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* release an AFS file or directory and discard its key
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*/
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int afs_release(struct inode *inode, struct file *file)
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{
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struct afs_vnode *vnode = AFS_FS_I(inode);
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struct afs_file *af = file->private_data;
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int ret = 0;
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_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
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if ((file->f_mode & FMODE_WRITE))
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ret = vfs_fsync(file, 0);
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file->private_data = NULL;
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if (af->wb)
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afs_put_wb_key(af->wb);
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key_put(af->key);
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kfree(af);
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afs_prune_wb_keys(vnode);
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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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* Dispose of a ref to a read record.
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*/
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void afs_put_read(struct afs_read *req)
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{
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int i;
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if (refcount_dec_and_test(&req->usage)) {
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if (req->pages) {
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for (i = 0; i < req->nr_pages; i++)
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if (req->pages[i])
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put_page(req->pages[i]);
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if (req->pages != req->array)
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kfree(req->pages);
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}
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kfree(req);
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}
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}
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#ifdef CONFIG_AFS_FSCACHE
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/*
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* deal with notification that a page was read from the cache
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*/
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static void afs_file_readpage_read_complete(struct page *page,
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void *data,
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int error)
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{
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_enter("%p,%p,%d", page, data, error);
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/* if the read completes with an error, we just unlock the page and let
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* the VM reissue the readpage */
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if (!error)
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SetPageUptodate(page);
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unlock_page(page);
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}
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#endif
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static void afs_fetch_data_success(struct afs_operation *op)
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{
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struct afs_vnode *vnode = op->file[0].vnode;
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_enter("op=%08x", op->debug_id);
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afs_check_for_remote_deletion(op, vnode);
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afs_vnode_commit_status(op, &op->file[0]);
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afs_stat_v(vnode, n_fetches);
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atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes);
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}
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static void afs_fetch_data_put(struct afs_operation *op)
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{
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afs_put_read(op->fetch.req);
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}
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static const struct afs_operation_ops afs_fetch_data_operation = {
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.issue_afs_rpc = afs_fs_fetch_data,
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.issue_yfs_rpc = yfs_fs_fetch_data,
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.success = afs_fetch_data_success,
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.put = afs_fetch_data_put,
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};
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/*
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* Fetch file data from the volume.
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*/
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int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *req)
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{
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struct afs_operation *op;
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_enter("%s{%llx:%llu.%u},%x,,,",
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vnode->volume->name,
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vnode->fid.vid,
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vnode->fid.vnode,
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vnode->fid.unique,
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key_serial(key));
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op = afs_alloc_operation(key, vnode->volume);
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if (IS_ERR(op))
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return PTR_ERR(op);
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afs_op_set_vnode(op, 0, vnode);
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op->fetch.req = afs_get_read(req);
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op->ops = &afs_fetch_data_operation;
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return afs_do_sync_operation(op);
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}
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/*
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* read page from file, directory or symlink, given a key to use
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*/
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int afs_page_filler(void *data, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct afs_vnode *vnode = AFS_FS_I(inode);
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struct afs_read *req;
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struct key *key = data;
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int ret;
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_enter("{%x},{%lu},{%lu}", key_serial(key), inode->i_ino, page->index);
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BUG_ON(!PageLocked(page));
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ret = -ESTALE;
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if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
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goto error;
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/* is it cached? */
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#ifdef CONFIG_AFS_FSCACHE
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ret = fscache_read_or_alloc_page(vnode->cache,
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page,
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afs_file_readpage_read_complete,
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NULL,
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GFP_KERNEL);
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#else
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ret = -ENOBUFS;
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#endif
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switch (ret) {
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/* read BIO submitted (page in cache) */
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case 0:
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break;
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/* page not yet cached */
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case -ENODATA:
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_debug("cache said ENODATA");
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goto go_on;
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/* page will not be cached */
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case -ENOBUFS:
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_debug("cache said ENOBUFS");
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/* fall through */
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default:
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go_on:
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req = kzalloc(struct_size(req, array, 1), GFP_KERNEL);
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if (!req)
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goto enomem;
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/* We request a full page. If the page is a partial one at the
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* end of the file, the server will return a short read and the
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* unmarshalling code will clear the unfilled space.
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*/
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refcount_set(&req->usage, 1);
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req->pos = (loff_t)page->index << PAGE_SHIFT;
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req->len = PAGE_SIZE;
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req->nr_pages = 1;
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req->pages = req->array;
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req->pages[0] = page;
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get_page(page);
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/* read the contents of the file from the server into the
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* page */
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ret = afs_fetch_data(vnode, key, req);
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afs_put_read(req);
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if (ret < 0) {
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if (ret == -ENOENT) {
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_debug("got NOENT from server"
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" - marking file deleted and stale");
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set_bit(AFS_VNODE_DELETED, &vnode->flags);
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ret = -ESTALE;
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}
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#ifdef CONFIG_AFS_FSCACHE
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fscache_uncache_page(vnode->cache, page);
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#endif
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BUG_ON(PageFsCache(page));
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if (ret == -EINTR ||
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ret == -ENOMEM ||
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ret == -ERESTARTSYS ||
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ret == -EAGAIN)
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goto error;
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goto io_error;
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}
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SetPageUptodate(page);
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/* send the page to the cache */
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#ifdef CONFIG_AFS_FSCACHE
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if (PageFsCache(page) &&
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fscache_write_page(vnode->cache, page, vnode->status.size,
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GFP_KERNEL) != 0) {
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fscache_uncache_page(vnode->cache, page);
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BUG_ON(PageFsCache(page));
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}
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#endif
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unlock_page(page);
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}
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_leave(" = 0");
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return 0;
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io_error:
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SetPageError(page);
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goto error;
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enomem:
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ret = -ENOMEM;
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error:
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unlock_page(page);
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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 page from file, directory or symlink, given a file to nominate the key
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* to be used
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*/
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static int afs_readpage(struct file *file, struct page *page)
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{
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struct key *key;
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int ret;
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if (file) {
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key = afs_file_key(file);
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ASSERT(key != NULL);
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ret = afs_page_filler(key, page);
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} else {
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struct inode *inode = page->mapping->host;
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key = afs_request_key(AFS_FS_S(inode->i_sb)->cell);
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if (IS_ERR(key)) {
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ret = PTR_ERR(key);
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} else {
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ret = afs_page_filler(key, page);
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key_put(key);
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}
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}
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return ret;
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}
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/*
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* Make pages available as they're filled.
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*/
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static void afs_readpages_page_done(struct afs_read *req)
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{
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#ifdef CONFIG_AFS_FSCACHE
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struct afs_vnode *vnode = req->vnode;
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#endif
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struct page *page = req->pages[req->index];
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req->pages[req->index] = NULL;
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SetPageUptodate(page);
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/* send the page to the cache */
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#ifdef CONFIG_AFS_FSCACHE
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if (PageFsCache(page) &&
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fscache_write_page(vnode->cache, page, vnode->status.size,
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GFP_KERNEL) != 0) {
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fscache_uncache_page(vnode->cache, page);
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BUG_ON(PageFsCache(page));
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}
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#endif
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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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* Read a contiguous set of pages.
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*/
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static int afs_readpages_one(struct file *file, struct address_space *mapping,
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struct list_head *pages)
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{
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struct afs_vnode *vnode = AFS_FS_I(mapping->host);
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struct afs_read *req;
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struct list_head *p;
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struct page *first, *page;
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struct key *key = afs_file_key(file);
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pgoff_t index;
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int ret, n, i;
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/* Count the number of contiguous pages at the front of the list. Note
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* that the list goes prev-wards rather than next-wards.
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*/
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first = lru_to_page(pages);
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index = first->index + 1;
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n = 1;
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for (p = first->lru.prev; p != pages; p = p->prev) {
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page = list_entry(p, struct page, lru);
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if (page->index != index)
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break;
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index++;
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n++;
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}
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req = kzalloc(struct_size(req, array, n), GFP_NOFS);
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if (!req)
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return -ENOMEM;
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refcount_set(&req->usage, 1);
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req->vnode = vnode;
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req->page_done = afs_readpages_page_done;
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req->pos = first->index;
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req->pos <<= PAGE_SHIFT;
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req->pages = req->array;
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/* Transfer the pages to the request. We add them in until one fails
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* to add to the LRU and then we stop (as that'll make a hole in the
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* contiguous run.
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*
|
|
* Note that it's possible for the file size to change whilst we're
|
|
* doing this, but we rely on the server returning less than we asked
|
|
* for if the file shrank. We also rely on this to deal with a partial
|
|
* page at the end of the file.
|
|
*/
|
|
do {
|
|
page = lru_to_page(pages);
|
|
list_del(&page->lru);
|
|
index = page->index;
|
|
if (add_to_page_cache_lru(page, mapping, index,
|
|
readahead_gfp_mask(mapping))) {
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
fscache_uncache_page(vnode->cache, page);
|
|
#endif
|
|
put_page(page);
|
|
break;
|
|
}
|
|
|
|
req->pages[req->nr_pages++] = page;
|
|
req->len += PAGE_SIZE;
|
|
} while (req->nr_pages < n);
|
|
|
|
if (req->nr_pages == 0) {
|
|
kfree(req);
|
|
return 0;
|
|
}
|
|
|
|
ret = afs_fetch_data(vnode, key, req);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
task_io_account_read(PAGE_SIZE * req->nr_pages);
|
|
afs_put_read(req);
|
|
return 0;
|
|
|
|
error:
|
|
if (ret == -ENOENT) {
|
|
_debug("got NOENT from server"
|
|
" - marking file deleted and stale");
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
ret = -ESTALE;
|
|
}
|
|
|
|
for (i = 0; i < req->nr_pages; i++) {
|
|
page = req->pages[i];
|
|
if (page) {
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
fscache_uncache_page(vnode->cache, page);
|
|
#endif
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
}
|
|
}
|
|
|
|
afs_put_read(req);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* read a set of pages
|
|
*/
|
|
static int afs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
struct key *key = afs_file_key(file);
|
|
struct afs_vnode *vnode;
|
|
int ret = 0;
|
|
|
|
_enter("{%d},{%lu},,%d",
|
|
key_serial(key), mapping->host->i_ino, nr_pages);
|
|
|
|
ASSERT(key != NULL);
|
|
|
|
vnode = AFS_FS_I(mapping->host);
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
|
|
_leave(" = -ESTALE");
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* attempt to read as many of the pages as possible */
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
ret = fscache_read_or_alloc_pages(vnode->cache,
|
|
mapping,
|
|
pages,
|
|
&nr_pages,
|
|
afs_file_readpage_read_complete,
|
|
NULL,
|
|
mapping_gfp_mask(mapping));
|
|
#else
|
|
ret = -ENOBUFS;
|
|
#endif
|
|
|
|
switch (ret) {
|
|
/* all pages are being read from the cache */
|
|
case 0:
|
|
BUG_ON(!list_empty(pages));
|
|
BUG_ON(nr_pages != 0);
|
|
_leave(" = 0 [reading all]");
|
|
return 0;
|
|
|
|
/* there were pages that couldn't be read from the cache */
|
|
case -ENODATA:
|
|
case -ENOBUFS:
|
|
break;
|
|
|
|
/* other error */
|
|
default:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
while (!list_empty(pages)) {
|
|
ret = afs_readpages_one(file, mapping, pages);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
_leave(" = %d [netting]", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* invalidate part or all of a page
|
|
* - release a page and clean up its private data if offset is 0 (indicating
|
|
* the entire page)
|
|
*/
|
|
static void afs_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
|
|
unsigned long priv;
|
|
|
|
_enter("{%lu},%u,%u", page->index, offset, length);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
/* we clean up only if the entire page is being invalidated */
|
|
if (offset == 0 && length == PAGE_SIZE) {
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
if (PageFsCache(page)) {
|
|
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
|
|
fscache_wait_on_page_write(vnode->cache, page);
|
|
fscache_uncache_page(vnode->cache, page);
|
|
}
|
|
#endif
|
|
|
|
if (PagePrivate(page)) {
|
|
priv = page_private(page);
|
|
trace_afs_page_dirty(vnode, tracepoint_string("inval"),
|
|
page->index, priv);
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
}
|
|
}
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* release a page and clean up its private state if it's not busy
|
|
* - return true if the page can now be released, false if not
|
|
*/
|
|
static int afs_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
|
|
unsigned long priv;
|
|
|
|
_enter("{{%llx:%llu}[%lu],%lx},%x",
|
|
vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
|
|
gfp_flags);
|
|
|
|
/* deny if page is being written to the cache and the caller hasn't
|
|
* elected to wait */
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) {
|
|
_leave(" = F [cache busy]");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
if (PagePrivate(page)) {
|
|
priv = page_private(page);
|
|
trace_afs_page_dirty(vnode, tracepoint_string("rel"),
|
|
page->index, priv);
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
}
|
|
|
|
/* indicate that the page can be released */
|
|
_leave(" = T");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Handle setting up a memory mapping on an AFS file.
|
|
*/
|
|
static int afs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
ret = generic_file_mmap(file, vma);
|
|
if (ret == 0)
|
|
vma->vm_ops = &afs_vm_ops;
|
|
return ret;
|
|
}
|