Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * mdt.c - meta data file for NILFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Written by Ryusuke Konishi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/mpage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "nilfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "btnode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "segment.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "page.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "mdt.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "alloc.h"		/* nilfs_palloc_destroy_cache() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <trace/events/nilfs2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define NILFS_MDT_MAX_RA_BLOCKS		(16 - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			   struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			   void (*init_block)(struct inode *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 					      struct buffer_head *, void *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct nilfs_inode_info *ii = NILFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	void *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	/* Caller exclude read accesses using page lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	/* set_buffer_new(bh); */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	bh->b_blocknr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	set_buffer_mapped(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	kaddr = kmap_atomic(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	memset(kaddr + bh_offset(bh), 0, i_blocksize(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (init_block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		init_block(inode, bh, kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	flush_dcache_page(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	set_buffer_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	mark_buffer_dirty(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	nilfs_mdt_mark_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 				  struct buffer_head **out_bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 				  void (*init_block)(struct inode *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 						     struct buffer_head *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 						     void *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct nilfs_transaction_info ti;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	nilfs_transaction_begin(sb, &ti, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (unlikely(!bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		goto failed_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	err = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	if (buffer_uptodate(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		goto failed_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	wait_on_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (buffer_uptodate(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		goto failed_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	bh->b_bdev = sb->s_bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (likely(!err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		get_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		*out_bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  failed_bh:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	unlock_page(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	put_page(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  failed_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (likely(!err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		err = nilfs_transaction_commit(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		nilfs_transaction_abort(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		       int mode, int mode_flags, struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	__u64 blknum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	int ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (unlikely(!bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	ret = -EEXIST; /* internal code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (buffer_uptodate(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (mode_flags & REQ_RAHEAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (!trylock_buffer(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			goto failed_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	} else /* mode == READ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (buffer_uptodate(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (unlikely(ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		goto failed_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	map_bh(bh, inode->i_sb, (sector_t)blknum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	bh->b_end_io = end_buffer_read_sync;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	get_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	submit_bh(mode, mode_flags, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	get_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	*out_bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  failed_bh:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	unlock_page(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	put_page(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				int readahead, struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct buffer_head *first_bh, *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	unsigned long blkoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (err == -EEXIST) /* internal code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (readahead) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		blkoff = block + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 						     REQ_RAHEAD, &bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			if (likely(!err || err == -EEXIST))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 				brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			else if (err != -EBUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				/* abort readahead if bmap lookup failed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			if (!buffer_locked(first_bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 				goto out_no_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	wait_on_buffer(first_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  out_no_wait:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (!buffer_uptodate(first_bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		nilfs_err(inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			  "I/O error reading meta-data file (ino=%lu, block-offset=%lu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			  inode->i_ino, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		goto failed_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	*out_bh = first_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  failed_bh:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	brelse(first_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  * nilfs_mdt_get_block - read or create a buffer on meta data file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * @inode: inode of the meta data file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * @blkoff: block offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * @create: create flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  * @init_block: initializer used for newly allocated block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  * @out_bh: output of a pointer to the buffer_head
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * nilfs_mdt_get_block() looks up the specified buffer and tries to create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * a new buffer if @create is not zero.  On success, the returned buffer is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * assured to be either existing or formatted using a buffer lock on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * @out_bh is substituted only when zero is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * Return Value: On success, it returns 0. On error, the following negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * %-ENOMEM - Insufficient memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * %-EIO - I/O error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  * %-ENOENT - the specified block does not exist (hole block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * %-EROFS - Read only filesystem (for create mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			void (*init_block)(struct inode *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 					   struct buffer_head *, void *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* Should be rewritten with merging nilfs_mdt_read_block() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (!create || ret != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (unlikely(ret == -EEXIST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		/* create = 0; */  /* limit read-create loop retries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)  * nilfs_mdt_find_block - find and get a buffer on meta data file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)  * @inode: inode of the meta data file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)  * @start: start block offset (inclusive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)  * @end: end block offset (inclusive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)  * @blkoff: block offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  * @out_bh: place to store a pointer to buffer_head struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)  * nilfs_mdt_find_block() looks up an existing block in range of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * [@start, @end] and stores pointer to a buffer head of the block to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * @out_bh, and block offset to @blkoff, respectively.  @out_bh and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  * @blkoff are substituted only when zero is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * Return Value: On success, it returns 0. On error, the following negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * %-ENOMEM - Insufficient memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  * %-EIO - I/O error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)  * %-ENOENT - no block was found in the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			 unsigned long end, unsigned long *blkoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			 struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	__u64 next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (unlikely(start > end))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	ret = nilfs_mdt_read_block(inode, start, true, out_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		*blkoff = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (unlikely(ret != -ENOENT || start == ULONG_MAX))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		if (next <= end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			ret = nilfs_mdt_read_block(inode, next, true, out_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 				*blkoff = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  * nilfs_mdt_delete_block - make a hole on the meta data file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)  * @inode: inode of the meta data file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  * @block: block offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * Return Value: On success, zero is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  * On error, one of the following negative error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  * %-ENOMEM - Insufficient memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * %-EIO - I/O error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) int nilfs_mdt_delete_block(struct inode *inode, unsigned long block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	struct nilfs_inode_info *ii = NILFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	err = nilfs_bmap_delete(ii->i_bmap, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (!err || err == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		nilfs_mdt_mark_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		nilfs_mdt_forget_block(inode, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  * nilfs_mdt_forget_block - discard dirty state and try to remove the page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)  * @inode: inode of the meta data file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)  * @block: block offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)  * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)  * tries to release the page including the buffer from a page cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)  * Return Value: On success, 0 is returned. On error, one of the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)  * negative error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)  * %-EBUSY - page has an active buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)  * %-ENOENT - page cache has no page addressed by the offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int nilfs_mdt_forget_block(struct inode *inode, unsigned long block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	pgoff_t index = (pgoff_t)block >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		(PAGE_SHIFT - inode->i_blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	unsigned long first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	int still_dirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	page = find_lock_page(inode->i_mapping, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	wait_on_page_writeback(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	first_block = (unsigned long)index <<
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		(PAGE_SHIFT - inode->i_blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		bh = nilfs_page_get_nth_block(page, block - first_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		nilfs_forget_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	still_dirty = PageDirty(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	if (still_dirty ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	    invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) int nilfs_mdt_fetch_dirty(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	struct nilfs_inode_info *ii = NILFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		set_bit(NILFS_I_DIRTY, &ii->i_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	return test_bit(NILFS_I_DIRTY, &ii->i_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (inode && sb_rdonly(inode->i_sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		 * It means that filesystem was remounted in read-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		 * mode because of error or metadata corruption. But we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		 * have dirty pages that try to be flushed in background.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		 * So, here we simply discard this dirty page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		nilfs_clear_dirty_page(page, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	redirty_page_for_writepage(wbc, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	if (wbc->sync_mode == WB_SYNC_ALL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		err = nilfs_construct_segment(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	else if (wbc->for_reclaim)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		nilfs_flush_segment(sb, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) static const struct address_space_operations def_mdt_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	.writepage		= nilfs_mdt_write_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static const struct inode_operations def_mdt_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static const struct file_operations def_mdt_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	struct nilfs_mdt_info *mi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	if (!mi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	init_rwsem(&mi->mi_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	inode->i_private = mi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	inode->i_mode = S_IFREG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	inode->i_op = &def_mdt_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	inode->i_fop = &def_mdt_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	inode->i_mapping->a_ops = &def_mdt_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)  * nilfs_mdt_clear - do cleanup for the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) void nilfs_mdt_clear(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	if (mdi->mi_palloc_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 		nilfs_palloc_destroy_cache(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)  * nilfs_mdt_destroy - release resources used by the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) void nilfs_mdt_destroy(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 	kfree(mdi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 			      unsigned int header_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 	struct nilfs_mdt_info *mi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 	mi->mi_entry_size = entry_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 	mi->mi_entries_per_block = i_blocksize(inode) / entry_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 	mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)  * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)  * @shadow: shadow mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) int nilfs_mdt_setup_shadow_map(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 			       struct nilfs_shadow_map *shadow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 	struct nilfs_mdt_info *mi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 	INIT_LIST_HEAD(&shadow->frozen_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	address_space_init_once(&shadow->frozen_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 	nilfs_mapping_init(&shadow->frozen_data, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 	address_space_init_once(&shadow->frozen_btnodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 	nilfs_mapping_init(&shadow->frozen_btnodes, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 	mi->mi_shadow = shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)  * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) int nilfs_mdt_save_to_shadow_map(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	struct nilfs_mdt_info *mi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 	struct nilfs_inode_info *ii = NILFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 	struct nilfs_shadow_map *shadow = mi->mi_shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 	ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 				     &ii->i_btnode_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 	struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 	struct buffer_head *bh_frozen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 	int blkbits = inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 	page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 	if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 	if (!page_has_buffers(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 		create_empty_buffers(page, 1 << blkbits, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 	bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 	if (!buffer_uptodate(bh_frozen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) 		nilfs_copy_buffer(bh_frozen, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 	if (list_empty(&bh_frozen->b_assoc_buffers)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) 		list_add_tail(&bh_frozen->b_assoc_buffers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) 			      &shadow->frozen_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 		set_buffer_nilfs_redirected(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) 		brelse(bh_frozen); /* already frozen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) 	put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) struct buffer_head *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) 	struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) 	struct buffer_head *bh_frozen = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) 	page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) 	if (page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) 		if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) 			n = bh_offset(bh) >> inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) 			bh_frozen = nilfs_page_get_nth_block(page, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) 		unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) 		put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) 	return bh_frozen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) 	struct list_head *head = &shadow->frozen_buffers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) 	while (!list_empty(head)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) 		bh = list_first_entry(head, struct buffer_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) 				      b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) 		list_del_init(&bh->b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) 		brelse(bh); /* drop ref-count to make it releasable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)  * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) 	struct nilfs_mdt_info *mi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) 	struct nilfs_inode_info *ii = NILFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) 	struct nilfs_shadow_map *shadow = mi->mi_shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) 	down_write(&mi->mi_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) 	if (mi->mi_palloc_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) 		nilfs_palloc_clear_cache(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) 	nilfs_clear_dirty_pages(inode->i_mapping, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) 	nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) 	nilfs_clear_dirty_pages(&ii->i_btnode_cache, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) 	nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) 	nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) 	up_write(&mi->mi_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)  * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)  * @inode: inode of the metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) void nilfs_mdt_clear_shadow_map(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) 	struct nilfs_mdt_info *mi = NILFS_MDT(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) 	struct nilfs_shadow_map *shadow = mi->mi_shadow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) 	down_write(&mi->mi_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) 	nilfs_release_frozen_buffers(shadow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) 	truncate_inode_pages(&shadow->frozen_data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) 	truncate_inode_pages(&shadow->frozen_btnodes, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) 	up_write(&mi->mi_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) }