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-rw-r--r--fs/nilfs2/mdt.c67
-rw-r--r--fs/nilfs2/mdt.h3
-rw-r--r--fs/nilfs2/page.c2
-rw-r--r--fs/nilfs2/page.h2
-rw-r--r--fs/nilfs2/segment.c1
5 files changed, 75 insertions, 0 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 00664686..532f85a 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -622,6 +622,72 @@ int nilfs_mdt_save_to_shadow_map(struct inode *inode)
return ret;
}
+int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
+{
+ struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
+ struct buffer_head *bh_frozen;
+ struct page *page;
+ int blkbits = inode->i_blkbits;
+ int ret = -ENOMEM;
+
+ page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
+ if (!page)
+ return ret;
+
+ if (!page_has_buffers(page))
+ create_empty_buffers(page, 1 << blkbits, 0);
+
+ bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
+ if (bh_frozen) {
+ if (!buffer_uptodate(bh_frozen))
+ nilfs_copy_buffer(bh_frozen, bh);
+ if (list_empty(&bh_frozen->b_assoc_buffers)) {
+ list_add_tail(&bh_frozen->b_assoc_buffers,
+ &shadow->frozen_buffers);
+ set_buffer_nilfs_redirected(bh);
+ } else {
+ brelse(bh_frozen); /* already frozen */
+ }
+ ret = 0;
+ }
+ unlock_page(page);
+ page_cache_release(page);
+ return ret;
+}
+
+struct buffer_head *
+nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
+{
+ struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
+ struct buffer_head *bh_frozen = NULL;
+ struct page *page;
+ int n;
+
+ page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
+ if (page) {
+ if (page_has_buffers(page)) {
+ n = bh_offset(bh) >> inode->i_blkbits;
+ bh_frozen = nilfs_page_get_nth_block(page, n);
+ }
+ unlock_page(page);
+ page_cache_release(page);
+ }
+ return bh_frozen;
+}
+
+static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
+{
+ struct list_head *head = &shadow->frozen_buffers;
+ struct buffer_head *bh;
+
+ while (!list_empty(head)) {
+ bh = list_first_entry(head, struct buffer_head,
+ b_assoc_buffers);
+ list_del_init(&bh->b_assoc_buffers);
+ brelse(bh); /* drop ref-count to make it releasable */
+ }
+}
+
/**
* nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
* @inode: inode of the metadata file
@@ -658,6 +724,7 @@ void nilfs_mdt_clear_shadow_map(struct inode *inode)
struct nilfs_shadow_map *shadow = mi->mi_shadow;
down_write(&mi->mi_sem);
+ nilfs_release_frozen_buffers(shadow);
truncate_inode_pages(&shadow->frozen_data, 0);
truncate_inode_pages(&shadow->frozen_btnodes, 0);
up_write(&mi->mi_sem);
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index e7f0d15..e60bbfe 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -100,6 +100,9 @@ int nilfs_mdt_setup_shadow_map(struct inode *inode,
int nilfs_mdt_save_to_shadow_map(struct inode *inode);
void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
void nilfs_mdt_clear_shadow_map(struct inode *inode);
+int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
+struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
+ struct buffer_head *bh);
#define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 6384ac1..7083344 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -131,6 +131,7 @@ void nilfs_forget_buffer(struct buffer_head *bh)
lock_buffer(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_checked(bh);
+ clear_buffer_nilfs_redirected(bh);
clear_buffer_dirty(bh);
if (nilfs_page_buffers_clean(page))
__nilfs_clear_page_dirty(page);
@@ -483,6 +484,7 @@ void nilfs_clear_dirty_pages(struct address_space *mapping)
clear_buffer_dirty(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_checked(bh);
+ clear_buffer_nilfs_redirected(bh);
clear_buffer_uptodate(bh);
clear_buffer_mapped(bh);
unlock_buffer(bh);
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index 6ec4f49..fb9e8a8 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -35,12 +35,14 @@ enum {
BH_NILFS_Node,
BH_NILFS_Volatile,
BH_NILFS_Checked,
+ BH_NILFS_Redirected,
};
BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */
BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
+BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
void nilfs_mark_buffer_dirty(struct buffer_head *bh);
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index b75306d..91dc066 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1908,6 +1908,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
set_buffer_uptodate(bh);
clear_buffer_dirty(bh);
clear_buffer_nilfs_volatile(bh);
+ clear_buffer_nilfs_redirected(bh);
if (bh == segbuf->sb_super_root) {
if (bh->b_page != bd_page) {
end_page_writeback(bd_page);
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