This patch adds a slab cache entry for small discards.
Each entry consists of:
struct discard_entry {
struct list_head list; /* list head */
block_t blkaddr; /* block address to be discarded */
int len; /* # of consecutive blocks of the discard */
};
Signed-off-by: Jaegeuk Kim <jaegeuk....@samsung.com>
---
fs/f2fs/f2fs.h | 14 ++++++++++++++
fs/f2fs/segment.c | 20 ++++++++++++++++++++
fs/f2fs/super.c | 7 ++++++-
3 files changed, 40 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 89dc750..c73e3df 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -97,6 +97,13 @@ struct dir_inode_entry {
struct inode *inode; /* vfs inode pointer */
};
+/* for the list of blockaddresses to be discarded */
+struct discard_entry {
+ struct list_head list; /* list head */
+ block_t blkaddr; /* block address to be discarded */
+ int len; /* # of consecutive blocks of the discard */
+};
+
/* for the list of fsync inodes, used only during recovery */
struct fsync_inode_entry {
struct list_head list; /* list head */
@@ -308,6 +315,11 @@ struct f2fs_sm_info {
/* a threshold to reclaim prefree segments */
unsigned int rec_prefree_segments;
+
+ /* for small discard management */
+ struct list_head discard_list; /* 4KB discard list */
+ int nr_discards; /* # of discards in the list */
+ int max_discards; /* max. discards to be issued */
};
/*
@@ -1079,6 +1091,8 @@ int lookup_journal_in_cursum(struct f2fs_summary_block *,
void flush_sit_entries(struct f2fs_sb_info *);
int build_segment_manager(struct f2fs_sb_info *);
void destroy_segment_manager(struct f2fs_sb_info *);
+int __init create_segment_manager_caches(void);
+void destroy_segment_manager_caches(void);
/*
* checkpoint.c
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 67f1e5b..823526e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -22,6 +22,8 @@
#define __reverse_ffz(x) __reverse_ffs(~(x))
+static struct kmem_cache *discard_entry_slab;
+
/*
* __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
* MSB and LSB are reversed in a byte by f2fs_set_bit.
@@ -1798,6 +1800,10 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
+ INIT_LIST_HEAD(&sm_info->discard_list);
+ sm_info->nr_discards = 0;
+ sm_info->max_discards = 0;
+
err = build_sit_info(sbi);
if (err)
return err;
@@ -1913,3 +1919,17 @@ void destroy_segment_manager(struct f2fs_sb_info *sbi)
sbi->sm_info = NULL;
kfree(sm_info);
}
+
+int __init create_segment_manager_caches(void)
+{
+ discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
+ sizeof(struct discard_entry), NULL);
+ if (!discard_entry_slab)
+ return -ENOMEM;
+ return 0;
+}
+
+void destroy_segment_manager_caches(void)
+{
+ kmem_cache_destroy(discard_entry_slab);
+}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bafff72..e9aa3f7 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1078,9 +1078,12 @@ static int __init init_f2fs_fs(void)
err = create_node_manager_caches();
if (err)
goto free_inodecache;
- err = create_gc_caches();
+ err = create_segment_manager_caches();
if (err)
goto free_node_manager_caches;
+ err = create_gc_caches();
+ if (err)
+ goto free_segment_manager_caches;
err = create_checkpoint_caches();
if (err)
goto free_gc_caches;
@@ -1102,6 +1105,8 @@ free_checkpoint_caches:
destroy_checkpoint_caches();
free_gc_caches:
destroy_gc_caches();
+free_segment_manager_caches:
+ destroy_segment_manager_caches();
free_node_manager_caches:
destroy_node_manager_caches();
free_inodecache:
--
1.8.4.474.g128a96c
------------------------------------------------------------------------------
DreamFactory - Open Source REST & JSON Services for HTML5 & Native Apps
OAuth, Users, Roles, SQL, NoSQL, BLOB Storage and External API Access
Free app hosting. Or install the open source package on any LAMP server.
Sign up and see examples for AngularJS, jQuery, Sencha Touch and Native!
http://pubads.g.doubleclick.net/gampad/clk?id=63469471&iu=/4140/ostg.clktrk
_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
