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 <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/Makefile b/fs/nilfs2/Makefile
index df3e62c..85c9873 100644
--- a/fs/nilfs2/Makefile
+++ b/fs/nilfs2/Makefile
@@ -2,4 +2,4 @@
nilfs2-y := inode.o file.o dir.o super.o namei.o page.o mdt.o \
btnode.o bmap.o btree.o direct.o dat.o recovery.o \
the_nilfs.o segbuf.o segment.o cpfile.o sufile.o \
- ifile.o alloc.o gcinode.o ioctl.o gcdat.o
+ ifile.o alloc.o gcinode.o ioctl.o
diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
index 0024440..8b782b0 100644
--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -533,22 +533,6 @@
nilfs_btree_init_gc(bmap);
}
-void nilfs_bmap_init_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
-{
- memcpy(gcbmap, bmap, sizeof(*bmap));
- init_rwsem(&gcbmap->b_sem);
- lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
- gcbmap->b_inode = &NILFS_BMAP_I(gcbmap)->vfs_inode;
-}
-
-void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
-{
- memcpy(bmap, gcbmap, sizeof(*bmap));
- init_rwsem(&bmap->b_sem);
- lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
- bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
-}
-
void nilfs_bmap_save(const struct nilfs_bmap *bmap,
struct nilfs_bmap_store *store)
{
diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h
index 5f3339e..bde1c0aa2 100644
--- a/fs/nilfs2/bmap.h
+++ b/fs/nilfs2/bmap.h
@@ -159,8 +159,6 @@
int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
void nilfs_bmap_init_gc(struct nilfs_bmap *);
-void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
-void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *);
void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *);
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 @@
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_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 @@
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 @@
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;
}
diff --git a/fs/nilfs2/gcdat.c b/fs/nilfs2/gcdat.c
deleted file mode 100644
index 84a45d1..0000000
--- a/fs/nilfs2/gcdat.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * gcdat.c - NILFS shadow DAT inode for GC
- *
- * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
- * and Ryusuke Konishi <ryusuke@osrg.net>.
- *
- */
-
-#include <linux/buffer_head.h>
-#include "nilfs.h"
-#include "page.h"
-#include "mdt.h"
-
-int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
-{
- struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
- struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
- int err;
-
- gcdat->i_state = 0;
- gcdat->i_blocks = dat->i_blocks;
- gii->i_flags = dii->i_flags;
- gii->i_state = dii->i_state | (1 << NILFS_I_GCDAT);
- gii->i_cno = 0;
- nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
- err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
- if (unlikely(err))
- return err;
-
- return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
- &dii->i_btnode_cache);
-}
-
-void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
-{
- struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
- struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
- struct address_space *mapping = dat->i_mapping;
- struct address_space *gmapping = gcdat->i_mapping;
-
- down_write(&NILFS_MDT(dat)->mi_sem);
- dat->i_blocks = gcdat->i_blocks;
- dii->i_flags = gii->i_flags;
- dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);
-
- nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
-
- nilfs_palloc_clear_cache(dat);
- nilfs_palloc_clear_cache(gcdat);
- nilfs_clear_dirty_pages(mapping);
- nilfs_copy_back_pages(mapping, gmapping);
- /* note: mdt dirty flags should be cleared by segctor. */
-
- nilfs_clear_dirty_pages(&dii->i_btnode_cache);
- nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);
-
- up_write(&NILFS_MDT(dat)->mi_sem);
-}
-
-void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
-{
- struct inode *gcdat = nilfs->ns_gc_dat;
- struct nilfs_inode_info *gii = NILFS_I(gcdat);
-
- gcdat->i_state = I_FREEING | I_CLEAR;
- gii->i_flags = 0;
-
- nilfs_palloc_clear_cache(gcdat);
- truncate_inode_pages(gcdat->i_mapping, 0);
- truncate_inode_pages(&gii->i_btnode_cache, 0);
-}
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 532f85a..3bbd340 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -414,8 +414,6 @@
sb = inode->i_sb;
nilfs = NILFS_MDT(inode)->mi_nilfs;
- if (page->mapping->assoc_mapping)
- return 0; /* Do not request flush for shadow page cache */
if (!sb) {
down_read(&nilfs->ns_writer_sem);
writer = nilfs->ns_writer;
@@ -566,13 +564,6 @@
mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
}
-void nilfs_mdt_set_shadow(struct inode *orig, struct inode *shadow)
-{
- shadow->i_mapping->assoc_mapping = orig->i_mapping;
- NILFS_I(shadow)->i_btnode_cache.assoc_mapping =
- &NILFS_I(orig)->i_btnode_cache;
-}
-
static const struct address_space_operations shadow_map_aops = {
.sync_page = block_sync_page,
};
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index e60bbfe..1e0901c 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -93,7 +93,6 @@
ino_t);
void nilfs_mdt_destroy(struct inode *);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
-void nilfs_mdt_set_shadow(struct inode *, struct inode *);
int nilfs_mdt_setup_shadow_map(struct inode *inode,
struct nilfs_shadow_map *shadow);
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index cf5507a..e9f4579 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -101,7 +101,6 @@
NILFS_I_INODE_DIRTY, /* write_inode is requested */
NILFS_I_BMAP, /* has bmap and btnode_cache */
NILFS_I_GCINODE, /* inode for GC, on memory only */
- NILFS_I_GCDAT, /* shadow DAT, on memory only */
};
/*
@@ -193,7 +192,7 @@
static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
{
- return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
+ return nilfs->ns_dat;
}
/*
@@ -294,11 +293,6 @@
int nilfs_init_gcinode(struct inode *inode);
void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
-/* gcdat.c */
-int nilfs_init_gcdat_inode(struct the_nilfs *);
-void nilfs_commit_gcdat_inode(struct the_nilfs *);
-void nilfs_clear_gcdat_inode(struct the_nilfs *);
-
/*
* Inodes and files operations
*/
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 7083344..a6c3c2e8 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -79,8 +79,8 @@
{
int blkbits = inode->i_blkbits;
pgoff_t index = blkoff >> (PAGE_CACHE_SHIFT - blkbits);
- struct page *page, *opage;
- struct buffer_head *bh, *obh;
+ struct page *page;
+ struct buffer_head *bh;
page = grab_cache_page(mapping, index);
if (unlikely(!page))
@@ -92,30 +92,6 @@
page_cache_release(page);
return NULL;
}
- if (!buffer_uptodate(bh) && mapping->assoc_mapping != NULL) {
- /*
- * Shadow page cache uses assoc_mapping to point its original
- * page cache. The following code tries the original cache
- * if the given cache is a shadow and it didn't hit.
- */
- opage = find_lock_page(mapping->assoc_mapping, index);
- if (!opage)
- return bh;
-
- obh = __nilfs_get_page_block(opage, blkoff, index, blkbits,
- b_state);
- if (buffer_uptodate(obh)) {
- nilfs_copy_buffer(bh, obh);
- if (buffer_dirty(obh)) {
- nilfs_mark_buffer_dirty(bh);
- if (!buffer_nilfs_node(bh) && NILFS_MDT(inode))
- nilfs_mdt_mark_dirty(inode);
- }
- }
- brelse(obh);
- unlock_page(opage);
- page_cache_release(opage);
- }
return bh;
}
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 91dc066..b0c5e08 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1945,11 +1945,9 @@
nilfs_drop_collected_inodes(&sci->sc_dirty_files);
- if (nilfs_doing_gc()) {
+ if (nilfs_doing_gc())
nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
- if (update_sr)
- nilfs_commit_gcdat_inode(nilfs);
- } else
+ else
nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
sci->sc_nblk_inc += sci->sc_nblk_this_inc;
@@ -2472,13 +2470,15 @@
nilfs_transaction_lock(sbi, &ti, 1);
- err = nilfs_init_gcdat_inode(nilfs);
+ err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
if (unlikely(err))
goto out_unlock;
err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
- if (unlikely(err))
+ if (unlikely(err)) {
+ nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
goto out_unlock;
+ }
sci->sc_freesegs = kbufs[4];
sci->sc_nfreesegs = argv[4].v_nmembs;
@@ -2510,7 +2510,7 @@
out_unlock:
sci->sc_freesegs = NULL;
sci->sc_nfreesegs = 0;
- nilfs_clear_gcdat_inode(nilfs);
+ nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
nilfs_transaction_unlock(sbi);
return err;
}
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 6eeb4f0..b7666bc 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -96,7 +96,6 @@
nilfs_mdt_destroy(nilfs->ns_sufile);
nilfs_mdt_destroy(nilfs->ns_cpfile);
nilfs_mdt_destroy(nilfs->ns_dat);
- nilfs_mdt_destroy(nilfs->ns_gc_dat);
}
if (nilfs_init(nilfs)) {
brelse(nilfs->ns_sbh[0]);
@@ -131,20 +130,14 @@
if (unlikely(!nilfs->ns_dat))
goto failed;
- nilfs->ns_gc_dat = nilfs_dat_new(nilfs, dat_entry_size);
- if (unlikely(!nilfs->ns_gc_dat))
- goto failed_dat;
-
nilfs->ns_cpfile = nilfs_cpfile_new(nilfs, checkpoint_size);
if (unlikely(!nilfs->ns_cpfile))
- goto failed_gc_dat;
+ goto failed_dat;
nilfs->ns_sufile = nilfs_sufile_new(nilfs, segment_usage_size);
if (unlikely(!nilfs->ns_sufile))
goto failed_cpfile;
- nilfs_mdt_set_shadow(nilfs->ns_dat, nilfs->ns_gc_dat);
-
err = nilfs_dat_read(nilfs->ns_dat, (void *)bh_sr->b_data +
NILFS_SR_DAT_OFFSET(inode_size));
if (unlikely(err))
@@ -173,9 +166,6 @@
failed_cpfile:
nilfs_mdt_destroy(nilfs->ns_cpfile);
- failed_gc_dat:
- nilfs_mdt_destroy(nilfs->ns_gc_dat);
-
failed_dat:
nilfs_mdt_destroy(nilfs->ns_dat);
goto failed;
@@ -371,7 +361,6 @@
nilfs_mdt_destroy(nilfs->ns_cpfile);
nilfs_mdt_destroy(nilfs->ns_sufile);
nilfs_mdt_destroy(nilfs->ns_dat);
- nilfs_mdt_destroy(nilfs->ns_gc_dat);
failed:
nilfs_clear_recovery_info(&ri);
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 1908dc7..a5178dc 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -74,7 +74,6 @@
* @ns_dat: DAT file inode
* @ns_cpfile: checkpoint file inode
* @ns_sufile: segusage file inode
- * @ns_gc_dat: shadow inode of the DAT file inode for GC
* @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)
* @ns_cptree_lock: lock protecting @ns_cptree
* @ns_gc_inodes: dummy inodes to keep live blocks
@@ -149,7 +148,6 @@
struct inode *ns_dat;
struct inode *ns_cpfile;
struct inode *ns_sufile;
- struct inode *ns_gc_dat;
/* Checkpoint tree */
struct rb_root ns_cptree;