From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [PATCH 15/24] nilfs2: implement buffer management subsystem debugging output
This patch adds debugging output by means of nilfs2_debug() method
into modules that are grouped by buffer management subsystem debugging
output option (CONFIG_NILFS2_DEBUG_BUFFER_MANAGEMENT).
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/page.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 0ba6798..330f172 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -47,6 +47,12 @@ __nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
unsigned long first_block;
struct buffer_head *bh;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu, block %lu, index %lu, "
+ "blkbits %d, b_state %#lx\n",
+ page->mapping->host->i_ino,
+ block, index, blkbits, b_state);
+
if (!page_has_buffers(page))
create_empty_buffers(page, 1 << blkbits, b_state);
@@ -68,6 +74,10 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
struct page *page;
struct buffer_head *bh;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu, blkoff %lu, b_state %#lx\n",
+ inode->i_ino, blkoff, b_state);
+
page = grab_cache_page(mapping, index);
if (unlikely(!page))
return NULL;
@@ -90,6 +100,10 @@ void nilfs_forget_buffer(struct buffer_head *bh)
{
struct page *page = bh->b_page;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu, bh->b_blocknr %lu, bh->b_size %lu\n",
+ page->mapping->host->i_ino, bh->b_blocknr, bh->b_size);
+
lock_buffer(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_checked(bh);
@@ -119,6 +133,10 @@ void nilfs_copy_buffer(struct buffer_head *dbh, struct buffer_head *sbh)
struct page *spage = sbh->b_page, *dpage = dbh->b_page;
struct buffer_head *bh;
+ nilfs2_debug(DBG_PAGE,
+ "dbh->b_blocknr %lu, sbh->b_blocknr %lu\n",
+ dbh->b_blocknr, sbh->b_blocknr);
+
kaddr0 = kmap_atomic(spage);
kaddr1 = kmap_atomic(dpage);
memcpy(kaddr1 + bh_offset(dbh), kaddr0 + bh_offset(sbh), sbh->b_size);
@@ -157,6 +175,9 @@ int nilfs_page_buffers_clean(struct page *page)
{
struct buffer_head *bh, *head;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu\n", page->mapping->host->i_ino);
+
bh = head = page_buffers(page);
do {
if (buffer_dirty(bh))
@@ -214,6 +235,13 @@ static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
struct buffer_head *dbh, *dbufs, *sbh, *sbufs;
unsigned long mask = NILFS_BUFFER_INHERENT_BITS;
+ nilfs2_debug(DBG_PAGE,
+ "ino %lu, dst offset %llu, "
+ "src offset %llu, copy_dirty %d\n",
+ src->mapping->host->i_ino,
+ page_offset(dst), page_offset(src),
+ copy_dirty);
+
BUG_ON(PageWriteback(dst));
sbh = sbufs = page_buffers(src);
@@ -261,6 +289,9 @@ int nilfs_copy_dirty_pages(struct address_space *dmap,
pgoff_t index = 0;
int err = 0;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu\n", smap->host->i_ino);
+
pagevec_init(&pvec, 0);
repeat:
if (!pagevec_lookup_tag(&pvec, smap, &index, PAGECACHE_TAG_DIRTY,
@@ -316,6 +347,9 @@ void nilfs_copy_back_pages(struct address_space *dmap,
pgoff_t index = 0;
int err;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu\n", smap->host->i_ino);
+
pagevec_init(&pvec, 0);
repeat:
n = pagevec_lookup(&pvec, smap, index, PAGEVEC_SIZE);
@@ -381,6 +415,9 @@ void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
unsigned int i;
pgoff_t index = 0;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu\n", mapping->host->i_ino);
+
pagevec_init(&pvec, 0);
while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
@@ -449,6 +486,10 @@ unsigned nilfs_page_count_clean_buffers(struct page *page,
struct buffer_head *bh, *head;
unsigned nc = 0;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu, from %u, to %u\n",
+ page->mapping->host->i_ino, from, to);
+
for (bh = head = page_buffers(page), block_start = 0;
bh != head || !block_start;
block_start = block_end, bh = bh->b_this_page) {
@@ -462,6 +503,8 @@ unsigned nilfs_page_count_clean_buffers(struct page *page,
void nilfs_mapping_init(struct address_space *mapping, struct inode *inode,
struct backing_dev_info *bdi)
{
+ nilfs2_debug(DBG_PAGE, "i_ino %lu\n", inode->i_ino);
+
mapping->host = inode;
mapping->flags = 0;
mapping_set_gfp_mask(mapping, GFP_NOFS);
@@ -485,6 +528,9 @@ int __nilfs_clear_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu\n", page->mapping->host->i_ino);
+
if (mapping) {
spin_lock_irq(&mapping->tree_lock);
if (test_bit(PG_dirty, &page->flags)) {
@@ -524,6 +570,10 @@ unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
struct pagevec pvec;
struct page *page;
+ nilfs2_debug(DBG_PAGE,
+ "i_ino %lu, start_blk %lu, blkoff %p\n",
+ inode->i_ino, start_blk, blkoff);
+
if (inode->i_mapping->nrpages == 0)
return 0;
--
1.7.9.5
--
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