mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-20 00:07:40 +07:00
ae98043f5f
Remove the verbose license text from NILFS2 files and replace them with SPDX tags. This does not change the license of any of the code. Link: http://lkml.kernel.org/r/1535624528-5982-1-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
192 lines
5.1 KiB
C
192 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* gcinode.c - dummy inodes to buffer blocks for garbage collection
|
|
*
|
|
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* Written by Seiji Kihara, Amagai Yoshiji, and Ryusuke Konishi.
|
|
* Revised by Ryusuke Konishi.
|
|
*
|
|
*/
|
|
/*
|
|
* This file adds the cache of on-disk blocks to be moved in garbage
|
|
* collection. The disk blocks are held with dummy inodes (called
|
|
* gcinodes), and this file provides lookup function of the dummy
|
|
* inodes and their buffer read function.
|
|
*
|
|
* Buffers and pages held by the dummy inodes will be released each
|
|
* time after they are copied to a new log. Dirty blocks made on the
|
|
* current generation and the blocks to be moved by GC never overlap
|
|
* because the dirty blocks make a new generation; they rather must be
|
|
* written individually.
|
|
*/
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/mpage.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/swap.h>
|
|
#include "nilfs.h"
|
|
#include "btree.h"
|
|
#include "btnode.h"
|
|
#include "page.h"
|
|
#include "mdt.h"
|
|
#include "dat.h"
|
|
#include "ifile.h"
|
|
|
|
/*
|
|
* nilfs_gccache_submit_read_data() - add data buffer and submit read request
|
|
* @inode - gc inode
|
|
* @blkoff - dummy offset treated as the key for the page cache
|
|
* @pbn - physical block number of the block
|
|
* @vbn - virtual block number of the block, 0 for non-virtual block
|
|
* @out_bh - indirect pointer to a buffer_head struct to receive the results
|
|
*
|
|
* Description: nilfs_gccache_submit_read_data() registers the data buffer
|
|
* specified by @pbn to the GC pagecache with the key @blkoff.
|
|
* This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the buffer.
|
|
*
|
|
* Return Value: On success, 0 is returned. On Error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EIO - I/O error.
|
|
*
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
|
*
|
|
* %-ENOENT - The block specified with @pbn does not exist.
|
|
*/
|
|
int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
|
|
sector_t pbn, __u64 vbn,
|
|
struct buffer_head **out_bh)
|
|
{
|
|
struct buffer_head *bh;
|
|
int err;
|
|
|
|
bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
|
|
if (unlikely(!bh))
|
|
return -ENOMEM;
|
|
|
|
if (buffer_uptodate(bh))
|
|
goto out;
|
|
|
|
if (pbn == 0) {
|
|
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
|
|
|
err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);
|
|
if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
|
|
brelse(bh);
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
lock_buffer(bh);
|
|
if (buffer_uptodate(bh)) {
|
|
unlock_buffer(bh);
|
|
goto out;
|
|
}
|
|
|
|
if (!buffer_mapped(bh)) {
|
|
bh->b_bdev = inode->i_sb->s_bdev;
|
|
set_buffer_mapped(bh);
|
|
}
|
|
bh->b_blocknr = pbn;
|
|
bh->b_end_io = end_buffer_read_sync;
|
|
get_bh(bh);
|
|
submit_bh(REQ_OP_READ, 0, bh);
|
|
if (vbn)
|
|
bh->b_blocknr = vbn;
|
|
out:
|
|
err = 0;
|
|
*out_bh = bh;
|
|
|
|
failed:
|
|
unlock_page(bh->b_page);
|
|
put_page(bh->b_page);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* nilfs_gccache_submit_read_node() - add node buffer and submit read request
|
|
* @inode - gc inode
|
|
* @pbn - physical block number for the block
|
|
* @vbn - virtual block number for the block
|
|
* @out_bh - indirect pointer to a buffer_head struct to receive the results
|
|
*
|
|
* Description: nilfs_gccache_submit_read_node() registers the node buffer
|
|
* specified by @vbn to the GC pagecache. @pbn can be supplied by the
|
|
* caller to avoid translation of the disk block address.
|
|
*
|
|
* Return Value: On success, 0 is returned. On Error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EIO - I/O error.
|
|
*
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
|
*/
|
|
int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
|
|
__u64 vbn, struct buffer_head **out_bh)
|
|
{
|
|
int ret;
|
|
|
|
ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
|
|
vbn ? : pbn, pbn, REQ_OP_READ, 0,
|
|
out_bh, &pbn);
|
|
if (ret == -EEXIST) /* internal code (cache hit) */
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
|
|
{
|
|
wait_on_buffer(bh);
|
|
if (!buffer_uptodate(bh)) {
|
|
struct inode *inode = bh->b_page->mapping->host;
|
|
|
|
nilfs_msg(inode->i_sb, KERN_ERR,
|
|
"I/O error reading %s block for GC (ino=%lu, vblocknr=%llu)",
|
|
buffer_nilfs_node(bh) ? "node" : "data",
|
|
inode->i_ino, (unsigned long long)bh->b_blocknr);
|
|
return -EIO;
|
|
}
|
|
if (buffer_dirty(bh))
|
|
return -EEXIST;
|
|
|
|
if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) {
|
|
clear_buffer_uptodate(bh);
|
|
return -EIO;
|
|
}
|
|
mark_buffer_dirty(bh);
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_init_gcinode(struct inode *inode)
|
|
{
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
|
|
inode->i_mode = S_IFREG;
|
|
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
|
|
inode->i_mapping->a_ops = &empty_aops;
|
|
|
|
ii->i_flags = 0;
|
|
nilfs_bmap_init_gc(ii->i_bmap);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
|
|
*/
|
|
void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs)
|
|
{
|
|
struct list_head *head = &nilfs->ns_gc_inodes;
|
|
struct nilfs_inode_info *ii;
|
|
|
|
while (!list_empty(head)) {
|
|
ii = list_first_entry(head, struct nilfs_inode_info, i_dirty);
|
|
list_del_init(&ii->i_dirty);
|
|
truncate_inode_pages(&ii->vfs_inode.i_data, 0);
|
|
nilfs_btnode_cache_clear(&ii->i_btnode_cache);
|
|
iput(&ii->vfs_inode);
|
|
}
|
|
}
|