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md/r5cache: refactoring journal recovery code 

1. rename r5l_read_meta_block() as r5l_recovery_read_meta_block();
2. pull the code that initialize r5l_meta_block from
   r5l_log_write_empty_meta_block() to a separate function
   r5l_recovery_create_empty_meta_block(), so that we can reuse this
   piece of code.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2016-11-17 15:24:42 -08:00 committed by Shaohua Li
parent 2c7da14b90
commit 9ed988f5dc
1 changed files with 18 additions and 9 deletions
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25
drivers/md/raid5-cache.c
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@ -1356,7 +1356,7 @@ struct r5l_recovery_ctx {
u64 seq; /* recovery position seq */
};
static int r5l_read_meta_block(struct r5l_log *log,
static int r5l_recovery_read_meta_block(struct r5l_log *log,
struct r5l_recovery_ctx *ctx)
{
struct page *page = ctx->meta_page;
@ -1530,7 +1530,7 @@ static void r5l_recovery_flush_log(struct r5l_log *log,
struct r5l_recovery_ctx *ctx)
{
while (1) {
if (r5l_read_meta_block(log, ctx))
if (r5l_recovery_read_meta_block(log, ctx))
return;
if (r5l_recovery_flush_one_meta(log, ctx))
return;
@ -1539,17 +1539,16 @@ static void r5l_recovery_flush_log(struct r5l_log *log,
}
}
static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos,
u64 seq)
static void
r5l_recovery_create_empty_meta_block(struct r5l_log *log,
struct page *page,
sector_t pos, u64 seq)
{
struct page *page;
struct r5l_meta_block *mb;
u32 crc;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
return -ENOMEM;
mb = page_address(page);
clear_page(mb);
mb->magic = cpu_to_le32(R5LOG_MAGIC);
mb->version = R5LOG_VERSION;
mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block));
@ -1557,7 +1556,17 @@ static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos,
mb->position = cpu_to_le64(pos);
crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE);
mb->checksum = cpu_to_le32(crc);
}
static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos,
u64 seq)
{
struct page *page;
page = alloc_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
r5l_recovery_create_empty_meta_block(log, page, pos, seq);
if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, REQ_OP_WRITE,
WRITE_FUA, false)) {
__free_page(page);