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f2fs: fix conditions to remain recovery information in f2fs_sync_file 

This patch revisited whole the recovery information during the f2fs_sync_file.

In this patch, there are three information to make a decision.

a) IS_CHECKPOINTED,	/* is it checkpointed before? */
b) HAS_FSYNCED_INODE,	/* is the inode fsynced before? */
c) HAS_LAST_FSYNC,	/* has the latest node fsync mark? */

And, the scenarios for our rule are based on:

[Term] F: fsync_mark, D: dentry_mark

1. inode(x) | CP | inode(x) | dnode(F)
2. inode(x) | CP | inode(F) | dnode(F)
3. inode(x) | CP | dnode(F) | inode(x) | inode(F)
4. inode(x) | CP | dnode(F) | inode(F)
5. CP | inode(x) | dnode(F) | inode(DF)
6. CP | inode(DF) | dnode(F)
7. CP | dnode(F) | inode(DF)
8. CP | dnode(F) | inode(x) | inode(DF)

For example, #3, the three conditions should be changed as follows.

   inode(x) | CP | dnode(F) | inode(x) | inode(F)
a)    x       o      o          o          o
b)    x       x      x          x          o
c)    x       o      o          x          o

If f2fs_sync_file stops   ------^,
 it should write inode(F)    --------------^

So, the need_inode_block_update should return true, since
 c) get_nat_flag(e, HAS_LAST_FSYNC), is false.

For example, #8,
      CP | alloc | dnode(F) | inode(x) | inode(DF)
a)    o      x        x          x          x
b)    x               x          x          o
c)    o               o          x          o

If f2fs_sync_file stops   -------^,
 it should write inode(DF)    --------------^

Note that, the roll-forward policy should follow this rule, which means,
if there are any missing blocks, we doesn't need to recover that inode.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-09-15 14:50:48 -07:00
Родитель 7ef35e3b9e
Коммит 88bd02c947
5 изменённых файлов: 56 добавлений и 40 удалений
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3
fs/f2fs/data.c
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@ -1089,9 +1089,6 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
if (check_direct_IO(inode, rw, iter, offset))
return 0;
/* clear fsync mark to recover these blocks */
fsync_mark_clear(F2FS_I_SB(inode), inode->i_ino);
trace_f2fs_direct_IO_enter(inode, offset, count, rw);
err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block);

6
fs/f2fs/f2fs.h
Просмотреть файл

@ -1224,9 +1224,9 @@ struct dnode_of_data;
struct node_info;
bool available_free_memory(struct f2fs_sb_info *, int);
int is_checkpointed_node(struct f2fs_sb_info *, nid_t);
bool fsync_mark_done(struct f2fs_sb_info *, nid_t);
void fsync_mark_clear(struct f2fs_sb_info *, nid_t);
bool is_checkpointed_node(struct f2fs_sb_info *, nid_t);
bool has_fsynced_inode(struct f2fs_sb_info *, nid_t);
bool need_inode_block_update(struct f2fs_sb_info *, nid_t);
void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
int truncate_inode_blocks(struct inode *, pgoff_t);

10
fs/f2fs/file.c
Просмотреть файл

@ -207,15 +207,17 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
up_write(&fi->i_sem);
}
} else {
/* if there is no written node page, write its inode page */
while (!sync_node_pages(sbi, ino, &wbc)) {
if (fsync_mark_done(sbi, ino))
goto out;
sync_nodes:
sync_node_pages(sbi, ino, &wbc);
if (need_inode_block_update(sbi, ino)) {
mark_inode_dirty_sync(inode);
ret = f2fs_write_inode(inode, NULL);
if (ret)
goto out;
goto sync_nodes;
}
ret = wait_on_node_pages_writeback(sbi, ino);
if (ret)
goto out;

56
fs/f2fs/node.c
Просмотреть файл

@ -123,44 +123,48 @@ static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
kmem_cache_free(nat_entry_slab, e);
}
int is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
int is_cp = 1;
bool is_cp = true;
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e && !get_nat_flag(e, IS_CHECKPOINTED))
is_cp = 0;
is_cp = false;
read_unlock(&nm_i->nat_tree_lock);
return is_cp;
}
bool fsync_mark_done(struct f2fs_sb_info *sbi, nid_t nid)
bool has_fsynced_inode(struct f2fs_sb_info *sbi, nid_t ino)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
bool fsync_done = false;
bool fsynced = false;
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e)
fsync_done = get_nat_flag(e, HAS_FSYNC_MARK);
e = __lookup_nat_cache(nm_i, ino);
if (e && get_nat_flag(e, HAS_FSYNCED_INODE))
fsynced = true;
read_unlock(&nm_i->nat_tree_lock);
return fsync_done;
return fsynced;
}
void fsync_mark_clear(struct f2fs_sb_info *sbi, nid_t nid)
bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct nat_entry *e;
bool need_update = true;
write_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e)
set_nat_flag(e, HAS_FSYNC_MARK, false);
write_unlock(&nm_i->nat_tree_lock);
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, ino);
if (e && get_nat_flag(e, HAS_LAST_FSYNC) &&
(get_nat_flag(e, IS_CHECKPOINTED) ||
get_nat_flag(e, HAS_FSYNCED_INODE)))
need_update = false;
read_unlock(&nm_i->nat_tree_lock);
return need_update;
}
static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
@ -176,7 +180,7 @@ static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
}
memset(new, 0, sizeof(struct nat_entry));
nat_set_nid(new, nid);
set_nat_flag(new, IS_CHECKPOINTED, true);
nat_reset_flag(new);
list_add_tail(&new->list, &nm_i->nat_entries);
nm_i->nat_cnt++;
return new;
@ -244,12 +248,17 @@ retry:
/* change address */
nat_set_blkaddr(e, new_blkaddr);
if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
set_nat_flag(e, IS_CHECKPOINTED, false);
__set_nat_cache_dirty(nm_i, e);
/* update fsync_mark if its inode nat entry is still alive */
e = __lookup_nat_cache(nm_i, ni->ino);
if (e)
set_nat_flag(e, HAS_FSYNC_MARK, fsync_done);
if (e) {
if (fsync_done && ni->nid == ni->ino)
set_nat_flag(e, HAS_FSYNCED_INODE, true);
set_nat_flag(e, HAS_LAST_FSYNC, fsync_done);
}
write_unlock(&nm_i->nat_tree_lock);
}
@ -1121,10 +1130,14 @@ continue_unlock:
/* called by fsync() */
if (ino && IS_DNODE(page)) {
int mark = !is_checkpointed_node(sbi, ino);
set_fsync_mark(page, 1);
if (IS_INODE(page))
set_dentry_mark(page, mark);
if (IS_INODE(page)) {
if (!is_checkpointed_node(sbi, ino) &&
!has_fsynced_inode(sbi, ino))
set_dentry_mark(page, 1);
else
set_dentry_mark(page, 0);
}
nwritten++;
} else {
set_fsync_mark(page, 0);
@ -1912,6 +1925,7 @@ void flush_nat_entries(struct f2fs_sb_info *sbi)
write_unlock(&nm_i->nat_tree_lock);
} else {
write_lock(&nm_i->nat_tree_lock);
nat_reset_flag(ne);
__clear_nat_cache_dirty(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
}

21
fs/f2fs/node.h
Просмотреть файл

@ -41,7 +41,8 @@ struct node_info {
enum {
IS_CHECKPOINTED, /* is it checkpointed before? */
HAS_FSYNC_MARK, /* has the latest node fsync mark? */
HAS_FSYNCED_INODE, /* is the inode fsynced before? */
HAS_LAST_FSYNC, /* has the latest node fsync mark? */
};
struct nat_entry {
@ -60,15 +61,9 @@ struct nat_entry {
#define nat_set_version(nat, v) (nat->ni.version = v)
#define __set_nat_cache_dirty(nm_i, ne) \
do { \
set_nat_flag(ne, IS_CHECKPOINTED, false); \
list_move_tail(&ne->list, &nm_i->dirty_nat_entries); \
} while (0)
list_move_tail(&ne->list, &nm_i->dirty_nat_entries);
#define __clear_nat_cache_dirty(nm_i, ne) \
do { \
set_nat_flag(ne, IS_CHECKPOINTED, true); \
list_move_tail(&ne->list, &nm_i->nat_entries); \
} while (0)
list_move_tail(&ne->list, &nm_i->nat_entries);
#define inc_node_version(version) (++version)
static inline void set_nat_flag(struct nat_entry *ne,
@ -87,6 +82,14 @@ static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type)
return ne->flag & mask;
}
static inline void nat_reset_flag(struct nat_entry *ne)
{
/* these states can be set only after checkpoint was done */
set_nat_flag(ne, IS_CHECKPOINTED, true);
set_nat_flag(ne, HAS_FSYNCED_INODE, false);
set_nat_flag(ne, HAS_LAST_FSYNC, true);
}
static inline void node_info_from_raw_nat(struct node_info *ni,
struct f2fs_nat_entry *raw_ne)
{