f2fs: avoid variable length array

Instead of using variable length array, this patch let preallocate memory for
them.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index ac2bd8e..e671373 100644 (file)
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -142,6 +142,7 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
        si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
        si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
        si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
+       si->base_mem += SIT_VBLOCK_MAP_SIZE;
        if (sbi->segs_per_sec > 1)
                si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
        si->base_mem += __bitmap_size(sbi, SIT_BITMAP);

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 877a272..c9d314f 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -505,7 +505,7 @@ static void add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc)
        struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
        unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
        unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
-       unsigned long dmap[entries];
+       unsigned long *dmap = SIT_I(sbi)->tmp_map;
        unsigned int start = 0, end = -1;
        bool force = (cpc->reason == CP_DISCARD);
        int i;
@@ -924,7 +924,7 @@ static void __next_free_blkoff(struct f2fs_sb_info *sbi,
 {
        struct seg_entry *se = get_seg_entry(sbi, seg->segno);
        int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
-       unsigned long target_map[entries];
+       unsigned long *target_map = SIT_I(sbi)->tmp_map;
        unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
        unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
        int i, pos;
@@ -1855,6 +1855,10 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
                        return -ENOMEM;
        }
 
+       sit_i->tmp_map = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+       if (!sit_i->tmp_map)
+               return -ENOMEM;
+
        if (sbi->segs_per_sec > 1) {
                sit_i->sec_entries = vzalloc(MAIN_SECS(sbi) *
                                        sizeof(struct sec_entry));
@@ -2236,6 +2240,8 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
                        kfree(sit_i->sentries[start].ckpt_valid_map);
                }
        }
+       kfree(sit_i->tmp_map);
+
        vfree(sit_i->sentries);
        vfree(sit_i->sec_entries);
        kfree(sit_i->dirty_sentries_bitmap);

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 421d579..ba858ca 100644 (file)
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -189,6 +189,7 @@ struct sit_info {
        char *sit_bitmap;               /* SIT bitmap pointer */
        unsigned int bitmap_size;       /* SIT bitmap size */
 
+       unsigned long *tmp_map;                 /* bitmap for temporal use */
        unsigned long *dirty_sentries_bitmap;   /* bitmap for dirty sentries */
        unsigned int dirty_sentries;            /* # of dirty sentries */
        unsigned int sents_per_block;           /* # of SIT entries per block */