Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ext4 / bitmap.c

diff --git a/kernel/fs/ext4/bitmap.c b/kernel/fs/ext4/bitmap.c
new file mode 100644 (file)
index 0000000..4a606af
--- /dev/null
+++ b/kernel/fs/ext4/bitmap.c
@@ -0,0 +1,97 @@
+/*
+ *  linux/fs/ext4/bitmap.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ */
+
+#include <linux/buffer_head.h>
+#include "ext4.h"
+
+unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
+{
+       return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
+}
+
+int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
+                                 struct ext4_group_desc *gdp,
+                                 struct buffer_head *bh, int sz)
+{
+       __u32 hi;
+       __u32 provided, calculated;
+       struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+       if (!ext4_has_metadata_csum(sb))
+               return 1;
+
+       provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
+       calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
+       if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
+               hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
+               provided |= (hi << 16);
+       } else
+               calculated &= 0xFFFF;
+
+       return provided == calculated;
+}
+
+void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
+                               struct ext4_group_desc *gdp,
+                               struct buffer_head *bh, int sz)
+{
+       __u32 csum;
+       struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+       if (!ext4_has_metadata_csum(sb))
+               return;
+
+       csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
+       gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
+       if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
+               gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
+}
+
+int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
+                                 struct ext4_group_desc *gdp,
+                                 struct buffer_head *bh)
+{
+       __u32 hi;
+       __u32 provided, calculated;
+       struct ext4_sb_info *sbi = EXT4_SB(sb);
+       int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
+
+       if (!ext4_has_metadata_csum(sb))
+               return 1;
+
+       provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
+       calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
+       if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
+               hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
+               provided |= (hi << 16);
+       } else
+               calculated &= 0xFFFF;
+
+       if (provided == calculated)
+               return 1;
+
+       return 0;
+}
+
+void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
+                               struct ext4_group_desc *gdp,
+                               struct buffer_head *bh)
+{
+       int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
+       __u32 csum;
+       struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+       if (!ext4_has_metadata_csum(sb))
+               return;
+
+       csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
+       gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
+       if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
+               gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
+}