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)  * segbuf.c - NILFS segment buffer
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/crc32.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/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "page.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "segbuf.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) struct nilfs_write_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	struct the_nilfs       *nilfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct bio	       *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	int			start, end; /* The region to be submitted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	int			rest_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	int			max_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	int			nr_vecs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	sector_t		blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			      struct the_nilfs *nilfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct nilfs_segment_buffer *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (unlikely(!segbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	segbuf->sb_super = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	INIT_LIST_HEAD(&segbuf->sb_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	segbuf->sb_super_root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	init_completion(&segbuf->sb_bio_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	atomic_set(&segbuf->sb_err, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	segbuf->sb_nbio = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	return segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	kmem_cache_free(nilfs_segbuf_cachep, segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		     unsigned long offset, struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	segbuf->sb_segnum = segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 				&segbuf->sb_fseg_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	segbuf->sb_rest_blocks =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  * nilfs_segbuf_map_cont - map a new log behind a given log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * @segbuf: new segment buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * @prev: segment buffer containing a log to be continued
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			   struct nilfs_segment_buffer *prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	segbuf->sb_segnum = prev->sb_segnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	segbuf->sb_fseg_start = prev->sb_fseg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	segbuf->sb_fseg_end = prev->sb_fseg_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	segbuf->sb_rest_blocks =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 				  __u64 nextnum, struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	segbuf->sb_nextnum = nextnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	bh = sb_getblk(segbuf->sb_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		       segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (unlikely(!bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	nilfs_segbuf_add_segsum_buffer(segbuf, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 				struct buffer_head **bhp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	bh = sb_getblk(segbuf->sb_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		       segbuf->sb_pseg_start + segbuf->sb_sum.nblocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (unlikely(!bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	nilfs_segbuf_add_payload_buffer(segbuf, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	*bhp = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		       time64_t ctime, __u64 cno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	err = nilfs_segbuf_extend_segsum(segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	segbuf->sb_sum.flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	segbuf->sb_sum.ctime = ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	segbuf->sb_sum.cno = cno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^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)  * Setup segment summary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	struct nilfs_segment_summary *raw_sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	struct buffer_head *bh_sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	bh_sum = list_entry(segbuf->sb_segsum_buffers.next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			    struct buffer_head, b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	raw_sum->ss_magic    = cpu_to_le32(NILFS_SEGSUM_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	raw_sum->ss_bytes    = cpu_to_le16(sizeof(*raw_sum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	raw_sum->ss_flags    = cpu_to_le16(segbuf->sb_sum.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	raw_sum->ss_seq      = cpu_to_le64(segbuf->sb_sum.seg_seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	raw_sum->ss_create   = cpu_to_le64(segbuf->sb_sum.ctime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	raw_sum->ss_next     = cpu_to_le64(segbuf->sb_sum.next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	raw_sum->ss_nblocks  = cpu_to_le32(segbuf->sb_sum.nblocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	raw_sum->ss_nfinfo   = cpu_to_le32(segbuf->sb_sum.nfinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	raw_sum->ss_pad      = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	raw_sum->ss_cno      = cpu_to_le64(segbuf->sb_sum.cno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^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)  * CRC calculation routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct nilfs_segment_summary *raw_sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	unsigned long size, bytes = segbuf->sb_sum.sumbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	u32 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	raw_sum = (struct nilfs_segment_summary *)bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	size = min_t(unsigned long, bytes, bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	crc = crc32_le(seed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		       (unsigned char *)raw_sum +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		       sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		       size - (sizeof(raw_sum->ss_datasum) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			       sizeof(raw_sum->ss_sumsum)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				     b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		bytes -= size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		size = min_t(unsigned long, bytes, bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		crc = crc32_le(crc, bh->b_data, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	raw_sum->ss_sumsum = cpu_to_le32(crc);
^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) static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 					  u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct nilfs_segment_summary *raw_sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	void *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	u32 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	raw_sum = (struct nilfs_segment_summary *)bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	crc = crc32_le(seed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		       (unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		       bh->b_size - sizeof(raw_sum->ss_datasum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 				     b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		crc = crc32_le(crc, bh->b_data, bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		kaddr = kmap_atomic(bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	raw_sum->ss_datasum = cpu_to_le32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 				    u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	struct nilfs_super_root *raw_sr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	unsigned int srsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	u32 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	srsize = NILFS_SR_BYTES(nilfs->ns_inode_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	crc = crc32_le(seed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		       (unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		       srsize - sizeof(raw_sr->sr_sum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	raw_sr->sr_sum = cpu_to_le32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static void nilfs_release_buffers(struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct buffer_head *bh, *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	list_for_each_entry_safe(bh, n, list, b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		list_del_init(&bh->b_assoc_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	nilfs_release_buffers(&segbuf->sb_segsum_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	nilfs_release_buffers(&segbuf->sb_payload_buffers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	segbuf->sb_super_root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  * Iterators for segment buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) void nilfs_clear_logs(struct list_head *logs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct nilfs_segment_buffer *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	list_for_each_entry(segbuf, logs, sb_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		nilfs_segbuf_clear(segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) void nilfs_truncate_logs(struct list_head *logs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			 struct nilfs_segment_buffer *last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct nilfs_segment_buffer *n, *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	segbuf = list_prepare_entry(last, logs, sb_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		list_del_init(&segbuf->sb_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		nilfs_segbuf_clear(segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		nilfs_segbuf_free(segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct nilfs_segment_buffer *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	list_for_each_entry(segbuf, logs, sb_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		ret = nilfs_segbuf_write(segbuf, nilfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) int nilfs_wait_on_logs(struct list_head *logs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	struct nilfs_segment_buffer *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	int err, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	list_for_each_entry(segbuf, logs, sb_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		err = nilfs_segbuf_wait(segbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		if (err && !ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  * nilfs_add_checksums_on_logs - add checksums on the logs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)  * @logs: list of segment buffers storing target logs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)  * @seed: checksum seed value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	struct nilfs_segment_buffer *segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	list_for_each_entry(segbuf, logs, sb_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		if (segbuf->sb_super_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			nilfs_segbuf_fill_in_super_root_crc(segbuf, seed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		nilfs_segbuf_fill_in_data_crc(segbuf, seed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * BIO operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static void nilfs_end_bio_write(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	struct nilfs_segment_buffer *segbuf = bio->bi_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (bio->bi_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		atomic_inc(&segbuf->sb_err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	complete(&segbuf->sb_bio_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 				   struct nilfs_write_info *wi, int mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 				   int mode_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	struct bio *bio = wi->bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (segbuf->sb_nbio > 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	    bdi_write_congested(segbuf->sb_super->s_bdi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		wait_for_completion(&segbuf->sb_bio_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		segbuf->sb_nbio--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		if (unlikely(atomic_read(&segbuf->sb_err))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	bio->bi_end_io = nilfs_end_bio_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	bio->bi_private = segbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	bio_set_op_attrs(bio, mode, mode_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	submit_bio(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	segbuf->sb_nbio++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	wi->bio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	wi->rest_blocks -= wi->end - wi->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	wi->start = wi->end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)  failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	wi->bio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)  * nilfs_alloc_seg_bio - allocate a new bio for writing log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)  * @nilfs: nilfs object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)  * @start: start block number of the bio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)  * @nr_vecs: request size of page vector.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)  * Return Value: On success, pointer to the struct bio is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)  * On error, NULL is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 				       int nr_vecs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	bio = bio_alloc(GFP_NOIO, nr_vecs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (bio == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		while (!bio && (nr_vecs >>= 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 			bio = bio_alloc(GFP_NOIO, nr_vecs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (likely(bio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		bio_set_dev(bio, nilfs->ns_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		bio->bi_iter.bi_sector =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 			start << (nilfs->ns_blocksize_bits - 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	return bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 				       struct nilfs_write_info *wi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	wi->bio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	wi->rest_blocks = segbuf->sb_sum.nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	wi->max_pages = BIO_MAX_PAGES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	wi->start = wi->end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	wi->blocknr = segbuf->sb_pseg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 				  struct nilfs_write_info *wi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 				  struct buffer_head *bh, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	int len, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	BUG_ON(wi->nr_vecs <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)  repeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	if (!wi->bio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 					      wi->nr_vecs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		if (unlikely(!wi->bio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	if (len == bh->b_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		wi->end++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	/* bio is FULL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	err = nilfs_segbuf_submit_bio(segbuf, wi, mode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	/* never submit current bh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	if (likely(!err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		goto repeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	return err;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)  * nilfs_segbuf_write - submit write requests of a log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)  * @segbuf: buffer storing a log to be written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)  * @nilfs: nilfs object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)  * Return Value: On Success, 0 is returned. On Error, one of the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)  * negative error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)  * %-EIO - I/O error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)  * %-ENOMEM - Insufficient memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 			      struct the_nilfs *nilfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	struct nilfs_write_info wi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	int res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	wi.nilfs = nilfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	nilfs_segbuf_prepare_write(segbuf, &wi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 		if (unlikely(res))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 			goto failed_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 		if (unlikely(res))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 			goto failed_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	if (wi.bio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 		 * Last BIO is always sent through the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 		 * submission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 		res = nilfs_segbuf_submit_bio(segbuf, &wi, REQ_OP_WRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 					      REQ_SYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)  failed_bio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)  * nilfs_segbuf_wait - wait for completion of requested BIOs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)  * @segbuf: segment buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)  * Return Value: On Success, 0 is returned. On Error, one of the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)  * negative error code is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)  * %-EIO - I/O error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 	if (!segbuf->sb_nbio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 		wait_for_completion(&segbuf->sb_bio_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 	} while (--segbuf->sb_nbio > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 	if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 		nilfs_err(segbuf->sb_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 			  "I/O error writing log (start-blocknr=%llu, block-count=%lu) in segment %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 			  (unsigned long long)segbuf->sb_pseg_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 			  segbuf->sb_sum.nblocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 			  (unsigned long long)segbuf->sb_segnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 		err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }