f2fs: add a slab cache entry for small discards
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.kim@samsung.com>
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 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 @@
/* 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 @@
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