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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-09-05 16:17:35 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-10-23 09:24:38 +0900
commit090fd5b10165033d7c30afde0a7e59141d820602 (patch)
treecbb3ec5b29719457cd45f72624d03d7e31af4a4c /fs/nilfs2/mdt.c
parentc6e071884aca360a14c21757d760e76ec34b4894 (diff)
downloadlinux-090fd5b10165033d7c30afde0a7e59141d820602.tar.gz
nilfs2: get rid of back pointer to writable sb instance
Nilfs object holds a back pointer to a writable super block instance in nilfs->ns_writer, and this became eliminable since sb is now made per device and all inodes have a valid pointer to it. This deletes the ns_writer pointer and a reader/writer semaphore protecting it. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/mdt.c')
-rw-r--r--fs/nilfs2/mdt.c33
1 files changed, 2 insertions, 31 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 32695f3c4b9..0a2ccfc0d6f 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -78,25 +78,11 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
struct buffer_head *,
void *))
{
- struct the_nilfs *nilfs = NILFS_I_NILFS(inode);
struct super_block *sb = inode->i_sb;
struct nilfs_transaction_info ti;
struct buffer_head *bh;
int err;
- if (!sb) {
- /*
- * Make sure this function is not called from any
- * read-only context.
- */
- if (!nilfs->ns_writer) {
- WARN_ON(1);
- err = -EROFS;
- goto out;
- }
- sb = nilfs->ns_writer->s_super;
- }
-
nilfs_transaction_begin(sb, &ti, 0);
err = -ENOMEM;
@@ -112,7 +98,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
if (buffer_uptodate(bh))
goto failed_bh;
- bh->b_bdev = nilfs->ns_bdev;
+ bh->b_bdev = sb->s_bdev;
err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
if (likely(!err)) {
get_bh(bh);
@@ -129,7 +115,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
err = nilfs_transaction_commit(sb);
else
nilfs_transaction_abort(sb);
- out:
+
return err;
}
@@ -398,8 +384,6 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
{
struct inode *inode;
struct super_block *sb;
- struct the_nilfs *nilfs;
- struct nilfs_sb_info *writer = NULL;
int err = 0;
redirty_page_for_writepage(wbc, page);
@@ -410,25 +394,12 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
return 0;
sb = inode->i_sb;
- nilfs = NILFS_SB(sb)->s_nilfs;
-
- if (!sb) {
- down_read(&nilfs->ns_writer_sem);
- writer = nilfs->ns_writer;
- if (!writer) {
- up_read(&nilfs->ns_writer_sem);
- return -EROFS;
- }
- sb = writer->s_super;
- }
if (wbc->sync_mode == WB_SYNC_ALL)
err = nilfs_construct_segment(sb);
else if (wbc->for_reclaim)
nilfs_flush_segment(sb, inode->i_ino);
- if (writer)
- up_read(&nilfs->ns_writer_sem);
return err;
}