f2fs: add core functions for rb-tree extent cache

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / f2fs / node.c

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 97bd9d3db88285e36a24c9d05b73c3a5c5e269f1..28423697e97acf4e940cec3535af15743d2b1391 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -41,7 +41,9 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
        /* only uses low memory */
        avail_ram = val.totalram - val.totalhigh;
 
-       /* give 25%, 25%, 50%, 50% memory for each components respectively */
+       /*
+        * give 25%, 25%, 50%, 50%, 50% memory for each components respectively
+        */
        if (type == FREE_NIDS) {
                mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >>
                                                        PAGE_CACHE_SHIFT;
@@ -62,6 +64,11 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
                        mem_size += (sbi->im[i].ino_num *
                                sizeof(struct ino_entry)) >> PAGE_CACHE_SHIFT;
                res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
+       } else if (type == EXTENT_CACHE) {
+               mem_size = (sbi->total_ext_tree * sizeof(struct extent_tree) +
+                               atomic_read(&sbi->total_ext_node) *
+                               sizeof(struct extent_node)) >> PAGE_CACHE_SHIFT;
+               res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
        } else {
                if (sbi->sb->s_bdi->dirty_exceeded)
                        return false;