#include "ext4_types.h"
#include "ext4_ialloc.h"
#include "ext4_super.h"
+#include "ext4_crc32c.h"
#include "ext4_fs.h"
#include "ext4_blockdev.h"
#include "ext4_block_group.h"
* @param inode I-node number to be converted
* @return Index of the i-node in the block group
*/
-static uint32_t ext4_ialloc_inode2index_in_group(struct ext4_sblock *sb,
- uint32_t inode)
+static uint32_t ext4_ialloc_inode_to_bgidx(struct ext4_sblock *sb,
+ uint32_t inode)
{
uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
return (inode - 1) % inodes_per_group;
* @return Absolute number of the i-node
*
*/
-static uint32_t ext4_ialloc_index_in_group2inode(struct ext4_sblock *sb,
- uint32_t index, uint32_t bgid)
+static uint32_t ext4_ialloc_bgidx_to_inode(struct ext4_sblock *sb,
+ uint32_t index, uint32_t bgid)
{
uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
return bgid * inodes_per_group + (index + 1);
return (inode - 1) / inodes_per_group;
}
+#if CONFIG_META_CSUM_ENABLE
+static uint32_t ext4_ialloc_bitmap_csum(struct ext4_sblock *sb, void *bitmap)
+{
+ uint32_t csum = 0;
+ if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ uint32_t inodes_per_group =
+ ext4_get32(sb, inodes_per_group);
+
+ /* First calculate crc32 checksum against fs uuid */
+ csum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid, sizeof(sb->uuid));
+ /* Then calculate crc32 checksum against inode bitmap */
+ csum = ext4_crc32c(csum, bitmap, (inodes_per_group + 7) / 8);
+ }
+ return csum;
+}
+#else
+#define ext4_ialloc_bitmap_csum(...) 0
+#endif
+
+void ext4_ialloc_set_bitmap_csum(struct ext4_sblock *sb, struct ext4_bgroup *bg,
+ void *bitmap __unused)
+{
+ int desc_size = ext4_sb_get_desc_size(sb);
+ uint32_t csum = ext4_ialloc_bitmap_csum(sb, bitmap);
+ uint16_t lo_csum = to_le16(csum & 0xFFFF),
+ hi_csum = to_le16(csum >> 16);
+
+ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
+ return;
+
+ /* See if we need to assign a 32bit checksum */
+ bg->inode_bitmap_csum_lo = lo_csum;
+ if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
+ bg->inode_bitmap_csum_hi = hi_csum;
+
+}
+
+#if CONFIG_META_CSUM_ENABLE
+static bool
+ext4_ialloc_verify_bitmap_csum(struct ext4_sblock *sb, struct ext4_bgroup *bg,
+ void *bitmap __unused)
+{
+
+ int desc_size = ext4_sb_get_desc_size(sb);
+ uint32_t csum = ext4_ialloc_bitmap_csum(sb, bitmap);
+ uint16_t lo_csum = to_le16(csum & 0xFFFF),
+ hi_csum = to_le16(csum >> 16);
+
+ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
+ return true;
+
+ if (bg->inode_bitmap_csum_lo != lo_csum)
+ return false;
+
+ if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
+ if (bg->inode_bitmap_csum_hi != hi_csum)
+ return false;
+
+ return true;
+}
+#else
+#define ext4_ialloc_verify_bitmap_csum(...) true
+#endif
+
int ext4_ialloc_free_inode(struct ext4_fs *fs, uint32_t index, bool is_dir)
{
struct ext4_sblock *sb = &fs->sb;
if (rc != EOK)
return rc;
+ struct ext4_bgroup *bg = bg_ref.block_group;
+
/* Load i-node bitmap */
uint32_t bitmap_block_addr =
- ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);
+ ext4_bg_get_inode_bitmap(bg, sb);
- struct ext4_block bitmap_block;
- rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
+ struct ext4_block b;
+ rc = ext4_block_get(fs->bdev, &b, bitmap_block_addr);
if (rc != EOK)
return rc;
+ if (!ext4_ialloc_verify_bitmap_csum(sb, bg, b.data)) {
+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
+ }
+
/* Free i-node in the bitmap */
- uint32_t index_in_group = ext4_ialloc_inode2index_in_group(sb, index);
- ext4_bmap_bit_clr(bitmap_block.data, index_in_group);
- bitmap_block.dirty = true;
+ uint32_t index_in_group = ext4_ialloc_inode_to_bgidx(sb, index);
+ ext4_bmap_bit_clr(b.data, index_in_group);
+ ext4_ialloc_set_bitmap_csum(sb, bg, b.data);
+ ext4_bcache_set_dirty(b.buf);
/* Put back the block with bitmap */
- rc = ext4_block_set(fs->bdev, &bitmap_block);
+ rc = ext4_block_set(fs->bdev, &b);
if (rc != EOK) {
/* Error in saving bitmap */
ext4_fs_put_block_group_ref(&bg_ref);
/* If released i-node is a directory, decrement used directories count
*/
if (is_dir) {
- uint32_t bg_used_dirs =
- ext4_bg_get_used_dirs_count(bg_ref.block_group, sb);
+ uint32_t bg_used_dirs = ext4_bg_get_used_dirs_count(bg, sb);
bg_used_dirs--;
- ext4_bg_set_used_dirs_count(bg_ref.block_group, sb,
- bg_used_dirs);
+ ext4_bg_set_used_dirs_count(bg, sb, bg_used_dirs);
}
/* Update block group free inodes count */
- uint32_t free_inodes =
- ext4_bg_get_free_inodes_count(bg_ref.block_group, sb);
+ uint32_t free_inodes = ext4_bg_get_free_inodes_count(bg, sb);
free_inodes++;
- ext4_bg_set_free_inodes_count(bg_ref.block_group, sb, free_inodes);
+ ext4_bg_set_free_inodes_count(bg, sb, free_inodes);
bg_ref.dirty = true;
return EOK;
}
-int ext4_ialloc_alloc_inode(struct ext4_fs *fs, uint32_t *index, bool is_dir)
+int ext4_ialloc_alloc_inode(struct ext4_fs *fs, uint32_t *idx, bool is_dir)
{
struct ext4_sblock *sb = &fs->sb;
/* Check if this block group is good candidate for allocation */
if (free_inodes > 0) {
/* Load block with bitmap */
- uint32_t bitmap_block_addr =
- ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);
+ uint32_t bmp_blk_add = ext4_bg_get_inode_bitmap(bg, sb);
- struct ext4_block bitmap_block;
- rc = ext4_block_get(fs->bdev, &bitmap_block,
- bitmap_block_addr);
+ struct ext4_block b;
+ rc = ext4_block_get(fs->bdev, &b, bmp_blk_add);
if (rc != EOK) {
ext4_fs_put_block_group_ref(&bg_ref);
return rc;
}
+ if (!ext4_ialloc_verify_bitmap_csum(sb, bg, b.data)) {
+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
+ }
+
/* Try to allocate i-node in the bitmap */
- uint32_t inodes_in_group =
- ext4_inodes_in_group_cnt(sb, bgid);
- uint32_t index_in_group;
+ uint32_t inodes_in_bg;
+ uint32_t idx_in_bg;
- rc = ext4_bmap_bit_find_clr(bitmap_block.data, 0,
- inodes_in_group,
- &index_in_group);
+ inodes_in_bg = ext4_inodes_in_group_cnt(sb, bgid);
+ rc = ext4_bmap_bit_find_clr(b.data, 0, inodes_in_bg,
+ &idx_in_bg);
/* Block group has not any free i-node */
if (rc == ENOSPC) {
- rc = ext4_block_set(fs->bdev, &bitmap_block);
+ rc = ext4_block_set(fs->bdev, &b);
if (rc != EOK) {
ext4_fs_put_block_group_ref(&bg_ref);
return rc;
continue;
}
- ext4_bmap_bit_set(bitmap_block.data, index_in_group);
+ ext4_bmap_bit_set(b.data, idx_in_bg);
/* Free i-node found, save the bitmap */
- bitmap_block.dirty = true;
+ ext4_ialloc_set_bitmap_csum(sb,bg,
+ b.data);
+ ext4_bcache_set_dirty(b.buf);
- ext4_block_set(fs->bdev, &bitmap_block);
+ ext4_block_set(fs->bdev, &b);
if (rc != EOK) {
ext4_fs_put_block_group_ref(&bg_ref);
return rc;
}
/* Decrease unused inodes count */
- if (ext4_bg_has_flag(bg,
- EXT4_BLOCK_GROUP_ITABLE_ZEROED)) {
- uint32_t unused =
- ext4_bg_get_itable_unused(bg, sb);
-
- uint32_t inodes_in_group =
- ext4_inodes_in_group_cnt(sb, bgid);
+ uint32_t unused =
+ ext4_bg_get_itable_unused(bg, sb);
- uint32_t free = inodes_in_group - unused;
+ uint32_t free = inodes_in_bg - unused;
- if (index_in_group >= free) {
- unused = inodes_in_group -
- (index_in_group + 1);
- ext4_bg_set_itable_unused(bg, sb,
- unused);
- }
+ if (idx_in_bg >= free) {
+ unused = inodes_in_bg - (idx_in_bg + 1);
+ ext4_bg_set_itable_unused(bg, sb, unused);
}
/* Save modified block group */
ext4_set32(sb, free_inodes_count, sb_free_inodes);
/* Compute the absolute i-nodex number */
- *index = ext4_ialloc_index_in_group2inode(
- sb, index_in_group, bgid);
+ *idx = ext4_ialloc_bgidx_to_inode(sb, idx_in_bg, bgid);
fs->last_inode_bg_id = bgid;
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