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f2fs: introduce a flag to represent each nat entry information

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This patch introduces a flag in the nat entry structure to merge various
information such as checkpointed and fsync_done marks.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-09-15 12:07:13 -07:00
parent 4c521f493b
commit 7ef35e3b9e
2 changed files with 31 additions and 10 deletions
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13
fs/f2fs/node.c
View File

@ -131,7 +131,7 @@ int is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e && !e->checkpointed)
if (e && !get_nat_flag(e, IS_CHECKPOINTED))
is_cp = 0;
read_unlock(&nm_i->nat_tree_lock);
return is_cp;
@ -146,7 +146,7 @@ bool fsync_mark_done(struct f2fs_sb_info *sbi, nid_t nid)
read_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e)
fsync_done = e->fsync_done;
fsync_done = get_nat_flag(e, HAS_FSYNC_MARK);
read_unlock(&nm_i->nat_tree_lock);
return fsync_done;
}
@ -159,7 +159,7 @@ void fsync_mark_clear(struct f2fs_sb_info *sbi, nid_t nid)
write_lock(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, nid);
if (e)
e->fsync_done = false;
set_nat_flag(e, HAS_FSYNC_MARK, false);
write_unlock(&nm_i->nat_tree_lock);
}
@ -176,7 +176,7 @@ 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);
new->checkpointed = true;
set_nat_flag(new, IS_CHECKPOINTED, true);
list_add_tail(&new->list, &nm_i->nat_entries);
nm_i->nat_cnt++;
return new;
@ -249,7 +249,7 @@ retry:
/* update fsync_mark if its inode nat entry is still alive */
e = __lookup_nat_cache(nm_i, ni->ino);
if (e)
e->fsync_done = fsync_done;
set_nat_flag(e, HAS_FSYNC_MARK, fsync_done);
write_unlock(&nm_i->nat_tree_lock);
}
@ -1349,7 +1349,8 @@ static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
read_lock(&nm_i->nat_tree_lock);
ne = __lookup_nat_cache(nm_i, nid);
if (ne &&
(!ne->checkpointed || nat_get_blkaddr(ne) != NULL_ADDR))
(!get_nat_flag(ne, IS_CHECKPOINTED) ||
nat_get_blkaddr(ne) != NULL_ADDR))
allocated = true;
read_unlock(&nm_i->nat_tree_lock);
if (allocated)

28
fs/f2fs/node.h
View File

@ -39,10 +39,14 @@ struct node_info {
unsigned char version; /* version of the node */
};
enum {
IS_CHECKPOINTED, /* is it checkpointed before? */
HAS_FSYNC_MARK, /* has the latest node fsync mark? */
};
struct nat_entry {
struct list_head list; /* for clean or dirty nat list */
bool checkpointed; /* whether it is checkpointed or not */
bool fsync_done; /* whether the latest node has fsync mark */
unsigned char flag; /* for node information bits */
struct node_info ni; /* in-memory node information */
};
@ -57,16 +61,32 @@ struct nat_entry {
#define __set_nat_cache_dirty(nm_i, ne) \
do { \
ne->checkpointed = false; \
set_nat_flag(ne, IS_CHECKPOINTED, false); \
list_move_tail(&ne->list, &nm_i->dirty_nat_entries); \
} while (0)
#define __clear_nat_cache_dirty(nm_i, ne) \
do { \
ne->checkpointed = true; \
set_nat_flag(ne, IS_CHECKPOINTED, true); \
list_move_tail(&ne->list, &nm_i->nat_entries); \
} while (0)
#define inc_node_version(version) (++version)
static inline void set_nat_flag(struct nat_entry *ne,
unsigned int type, bool set)
{
unsigned char mask = 0x01 << type;
if (set)
ne->flag |= mask;
else
ne->flag &= ~mask;
}
static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type)
{
unsigned char mask = 0x01 << type;
return ne->flag & mask;
}
static inline void node_info_from_raw_nat(struct node_info *ni,
struct f2fs_nat_entry *raw_ne)
{