From c1c1d7092072093ad960db2f6c08f06705c57fa4 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Sun, 29 Aug 2010 12:44:56 +0900 Subject: nilfs2: get rid of GCDAT inode This applies prepared rollback function and redirect function of metadata file to DAT file, and eliminates GCDAT inode. Signed-off-by: Ryusuke Konishi --- fs/nilfs2/dat.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) (limited to 'fs/nilfs2/dat.c') diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c index 0131467..7091c4e 100644 --- a/fs/nilfs2/dat.c +++ b/fs/nilfs2/dat.c @@ -36,6 +36,7 @@ struct nilfs_dat_info { struct nilfs_mdt_info mi; struct nilfs_palloc_cache palloc_cache; + struct nilfs_shadow_map shadow; }; static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat) @@ -327,6 +328,23 @@ int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr) ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); if (ret < 0) return ret; + + /* + * The given disk block number (blocknr) is not yet written to + * the device at this point. + * + * To prevent nilfs_dat_translate() from returning the + * uncommited block number, this makes a copy of the entry + * buffer and redirects nilfs_dat_translate() to the copy. + */ + if (!buffer_nilfs_redirected(entry_bh)) { + ret = nilfs_mdt_freeze_buffer(dat, entry_bh); + if (ret) { + brelse(entry_bh); + return ret; + } + } + kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); if (unlikely(entry->de_blocknr == cpu_to_le64(0))) { @@ -371,7 +389,7 @@ int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr) */ int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) { - struct buffer_head *entry_bh; + struct buffer_head *entry_bh, *bh; struct nilfs_dat_entry *entry; sector_t blocknr; void *kaddr; @@ -381,6 +399,15 @@ int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) if (ret < 0) return ret; + if (!nilfs_doing_gc() && buffer_nilfs_redirected(entry_bh)) { + bh = nilfs_mdt_get_frozen_buffer(dat, entry_bh); + if (bh) { + WARN_ON(!buffer_uptodate(bh)); + brelse(entry_bh); + entry_bh = bh; + } + } + kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); blocknr = le64_to_cpu(entry->de_blocknr); @@ -468,6 +495,7 @@ struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size) di = NILFS_DAT_I(dat); lockdep_set_class(&di->mi.mi_sem, &dat_lock_key); nilfs_palloc_setup_cache(dat, &di->palloc_cache); + nilfs_mdt_setup_shadow_map(dat, &di->shadow); } return dat; } -- cgit v1.1