return EOK;
}
+/**@brief Determine whether the block is inside the group.
+ * @param baddr block address
+ * @param bgid block group id
+ * @return Error code
+ */
+static int ext4_block_in_group(struct ext4_sblock *s,
+ uint32_t baddr,
+ uint32_t bgid)
+{
+ uint32_t actual_bgid;
+ actual_bgid = ext4_balloc_get_bgid_of_block(s, baddr);
+ if (actual_bgid == bgid)
+ return 1;
+ return 0;
+}
+
+/**@brief To avoid calling the atomic setbit hundreds or thousands of times, we only
+ * need to use it within a single byte (to ensure we get endianness right).
+ * We can use memset for the rest of the bitmap as there are no other users.
+ */
+static void ext4_fs_mark_bitmap_end(int start_bit, int end_bit, void *bitmap)
+{
+ int i;
+
+ if (start_bit >= end_bit)
+ return;
+
+ for (i = start_bit; (unsigned)i < ((start_bit + 7) & ~7UL); i++)
+ ext4_bmap_bit_set(bitmap, i);
+
+ if (i < end_bit)
+ memset((char *)bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
+}
+
/**@brief Initialize block bitmap in block group.
* @param bg_ref Reference to block group
* @return Error code
*/
static int ext4_fs_init_block_bitmap(struct ext4_block_group_ref *bg_ref)
{
- uint32_t i;
+ uint32_t i, bit, bit_max;
+ uint32_t group_blocks;
+ uint16_t inode_size = ext4_get16(&bg_ref->fs->sb, inode_size);
+ uint32_t block_size = ext4_sb_get_block_size(&bg_ref->fs->sb);
+ uint32_t inodes_per_group = ext4_get32(&bg_ref->fs->sb, inodes_per_group);
uint32_t bitmap_block_addr =
ext4_bg_get_block_bitmap(bg_ref->block_group, &bg_ref->fs->sb);
+ uint32_t bitmap_inode_addr =
+ ext4_bg_get_inode_bitmap(bg_ref->block_group, &bg_ref->fs->sb);
+ uint32_t inode_table_addr =
+ ext4_bg_get_inode_table_first_block(bg_ref->block_group,
+ &bg_ref->fs->sb);
+ uint32_t first_group_addr =
+ ext4_balloc_get_block_of_bgid(&bg_ref->fs->sb, bg_ref->index);
+
+ uint32_t dsc_per_block =
+ ext4_sb_get_block_size(&bg_ref->fs->sb) /
+ ext4_sb_get_desc_size(&bg_ref->fs->sb);
+
+ bool flex_bg =
+ ext4_sb_has_feature_incompatible(&bg_ref->fs->sb,
+ EXT4_FEATURE_INCOMPAT_FLEX_BG);
+
+ uint32_t inode_table_bcnt = inodes_per_group * inode_size / block_size;
struct ext4_block block_bitmap;
int rc =
if (rc != EOK)
return rc;
- memset(block_bitmap.data, 0, ext4_sb_get_block_size(&bg_ref->fs->sb));
-
- /* Determine first block and first data block in group */
- uint32_t first_idx = 0;
-
- uint32_t first_data =
- ext4_balloc_get_first_data_block_in_group(&bg_ref->fs->sb, bg_ref);
- uint32_t first_data_idx =
- ext4_fs_baddr2_index_in_group(&bg_ref->fs->sb, first_data);
+ memset(block_bitmap.data, 0, block_size);
- /*Set bits from to first block to first data block - 1 to one
- * (allocated)*/
- /*TODO: Optimize it*/
- for (i = first_idx; i < first_data_idx; ++i)
- ext4_bmap_bit_set(block_bitmap.data, i);
+ bit_max = ext4_sb_is_super_in_bg(&bg_ref->fs->sb, bg_ref->index);
+ if (!ext4_sb_has_feature_incompatible(&bg_ref->fs->sb,
+ EXT4_FEATURE_INCOMPAT_META_BG) ||
+ bg_ref->index < ext4_sb_first_meta_bg(&bg_ref->fs->sb) *
+ dsc_per_block) {
+ if (bit_max) {
+ bit_max += ext4_bg_num_gdb(&bg_ref->fs->sb,
+ bg_ref->index);
+ bit_max +=
+ ext4_get16(&bg_ref->fs->sb,
+ s_reserved_gdt_blocks);
+ }
+ } else { /* For META_BG_BLOCK_GROUPS */
+ bit_max += ext4_bg_num_gdb(&bg_ref->fs->sb,
+ bg_ref->index);
+ }
+ for (bit = 0; bit < bit_max; bit++)
+ ext4_bmap_bit_set(block_bitmap.data, bit);
+ if (bg_ref->index == ext4_block_group_cnt(&bg_ref->fs->sb) - 1) {
+ /*
+ * Even though mke2fs always initialize first and last group
+ * if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need
+ * to make sure we calculate the right free blocks
+ */
+ group_blocks = (ext4_sb_get_blocks_cnt(&bg_ref->fs->sb) -
+ ext4_get32(&bg_ref->fs->sb, first_data_block) -
+ (ext4_get32(&bg_ref->fs->sb, blocks_per_group) *
+ (ext4_block_group_cnt(&bg_ref->fs->sb) - 1)));
+ } else {
+ group_blocks = ext4_get32(&bg_ref->fs->sb, blocks_per_group);
+ }
+ if (!flex_bg ||
+ ext4_block_in_group(&bg_ref->fs->sb,
+ bitmap_block_addr, bg_ref->index))
+ ext4_bmap_bit_set(block_bitmap.data,
+ bitmap_block_addr - first_group_addr);
+
+ if (!flex_bg ||
+ ext4_block_in_group(&bg_ref->fs->sb,
+ bitmap_inode_addr, bg_ref->index))
+ ext4_bmap_bit_set(block_bitmap.data,
+ bitmap_inode_addr - first_group_addr);
+
+ for (i = inode_table_addr;
+ i < inode_table_addr + inode_table_bcnt; i++) {
+ if (!flex_bg ||
+ ext4_block_in_group(&bg_ref->fs->sb,
+ i,
+ bg_ref->index))
+ ext4_bmap_bit_set(block_bitmap.data,
+ i - first_group_addr);
+ }
+ /*
+ * Also if the number of blocks within the group is
+ * less than the blocksize * 8 ( which is the size
+ * of bitmap ), set rest of the block bitmap to 1
+ */
+ ext4_fs_mark_bitmap_end(group_blocks, block_size * 8, block_bitmap.data);
block_bitmap.dirty = true;
/* Save bitmap */
static uint32_t ext4_fs_correspond_inode_mode(int filetype)
{
switch (filetype) {
- case EXT4_DIRECTORY_FILETYPE_DIR:
+ case EXT4_DIRENTRY_DIR:
return EXT4_INODE_MODE_DIRECTORY;
- case EXT4_DIRECTORY_FILETYPE_REG_FILE:
+ case EXT4_DIRENTRY_REG_FILE:
return EXT4_INODE_MODE_FILE;
- case EXT4_DIRECTORY_FILETYPE_SYMLINK:
+ case EXT4_DIRENTRY_SYMLINK:
return EXT4_INODE_MODE_SOFTLINK;
default:
/* FIXME: right now we only support 3 file type. */
/* Check if newly allocated i-node will be a directory */
bool is_dir;
- is_dir = (filetype == EXT4_DIRECTORY_FILETYPE_DIR);
+ is_dir = (filetype == EXT4_DIRENTRY_DIR);
/* Allocate inode by allocation algorithm */
uint32_t index;
{
struct ext4_fs *fs = inode_ref->fs;
uint32_t offset;
- uint32_t suboffset;
+ uint32_t suboff;
+ int rc;
#if CONFIG_EXTENT_ENABLE
/* For extents must be data block destroyed by other way */
if ((ext4_sb_has_feature_incompatible(&fs->sb,
for (offset = 0; offset < count; ++offset) {
ind_block = to_le32(((uint32_t *)block.data)[offset]);
- if (ind_block != 0) {
- rc = ext4_balloc_free_block(inode_ref,
- ind_block);
- if (rc != EOK) {
- ext4_block_set(fs->bdev, &block);
- return rc;
- }
+ if (ind_block == 0)
+ continue;
+ rc = ext4_balloc_free_block(inode_ref, ind_block);
+ if (rc != EOK) {
+ ext4_block_set(fs->bdev, &block);
+ return rc;
}
+
}
ext4_block_set(fs->bdev, &block);
/* 3) Tripple indirect */
struct ext4_block subblock;
fblock = ext4_inode_get_indirect_block(inode_ref->inode, 2);
- if (fblock != 0) {
- int rc = ext4_block_get(fs->bdev, &block, fblock);
- if (rc != EOK)
- return rc;
+ if (fblock == 0)
+ goto finish;
+ rc = ext4_block_get(fs->bdev, &block, fblock);
+ if (rc != EOK)
+ return rc;
- uint32_t ind_block;
- for (offset = 0; offset < count; ++offset) {
- ind_block = to_le32(((uint32_t *)block.data)[offset]);
+ uint32_t ind_block;
+ for (offset = 0; offset < count; ++offset) {
+ ind_block = to_le32(((uint32_t *)block.data)[offset]);
- if (ind_block != 0) {
- rc = ext4_block_get(fs->bdev, &subblock,
- ind_block);
- if (rc != EOK) {
- ext4_block_set(fs->bdev, &block);
- return rc;
- }
-
- uint32_t ind_subblock;
- for (suboffset = 0; suboffset < count;
- ++suboffset) {
- ind_subblock = to_le32(
- ((uint32_t *)
- subblock.data)[suboffset]);
-
- if (ind_subblock != 0) {
- rc = ext4_balloc_free_block(
- inode_ref, ind_subblock);
- if (rc != EOK) {
- ext4_block_set(
- fs->bdev,
- &subblock);
- ext4_block_set(fs->bdev,
- &block);
- return rc;
- }
- }
- }
+ if (ind_block == 0)
+ continue;
+ rc = ext4_block_get(fs->bdev, &subblock,
+ ind_block);
+ if (rc != EOK) {
+ ext4_block_set(fs->bdev, &block);
+ return rc;
+ }
- ext4_block_set(fs->bdev, &subblock);
+ uint32_t ind_subblk;
+ for (suboff = 0; suboff < count; ++suboff) {
+ ind_subblk = to_le32(((uint32_t *)subblock.data)[suboff]);
- rc = ext4_balloc_free_block(inode_ref,
- ind_block);
- if (rc != EOK) {
- ext4_block_set(fs->bdev, &block);
- return rc;
- }
+ if (ind_subblk == 0)
+ continue;
+ rc = ext4_balloc_free_block(inode_ref, ind_subblk);
+ if (rc != EOK) {
+ ext4_block_set(fs->bdev, &subblock);
+ ext4_block_set(fs->bdev, &block);
+ return rc;
}
+
}
- ext4_block_set(fs->bdev, &block);
- rc = ext4_balloc_free_block(inode_ref, fblock);
- if (rc != EOK)
+ ext4_block_set(fs->bdev, &subblock);
+
+ rc = ext4_balloc_free_block(inode_ref,
+ ind_block);
+ if (rc != EOK) {
+ ext4_block_set(fs->bdev, &block);
return rc;
+ }
- ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
}
-#if CONFIG_EXTENT_ENABLE
+
+ ext4_block_set(fs->bdev, &block);
+ rc = ext4_balloc_free_block(inode_ref, fblock);
+ if (rc != EOK)
+ return rc;
+
+ ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
finish:
-#endif
/* Mark inode dirty for writing to the physical device */
inode_ref->dirty = true;
}
/* Free inode by allocator */
- int rc;
if (ext4_inode_is_type(&fs->sb, inode_ref->inode,
EXT4_INODE_MODE_DIRECTORY))
rc = ext4_ialloc_free_inode(fs, inode_ref->index, true);
}
/* Compute how many blocks will be released */
- uint64_t size_diff = old_size - new_size;
uint32_t block_size = ext4_sb_get_block_size(sb);
- uint32_t diff_blocks_count = size_diff / block_size;
- if (size_diff % block_size != 0)
- diff_blocks_count++;
-
- uint32_t old_blocks_count = old_size / block_size;
- if (old_size % block_size != 0)
- old_blocks_count++;
+ uint32_t new_blocks_count = (new_size + block_size - 1) /
+ block_size;
+ uint32_t old_blocks_count = (old_size + block_size - 1) /
+ block_size;
+ uint32_t diff_blocks_count = old_blocks_count - new_blocks_count;
#if CONFIG_EXTENT_ENABLE
if ((ext4_sb_has_feature_incompatible(sb,
EXT4_FEATURE_INCOMPAT_EXTENTS)) &&
(ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
/* Extents require special operation */
- int rc = ext4_extent_release_blocks_from(
- inode_ref, old_blocks_count - diff_blocks_count);
- if (rc != EOK)
- return rc;
+ if (diff_blocks_count) {
+ int rc = ext4_extent_release_blocks_from(
+ inode_ref,
+ new_blocks_count);
+ if (rc != EOK)
+ return rc;
+
+ }
} else
#endif
{
/* Starting from 1 because of logical blocks are numbered from 0
*/
- for (i = 1; i <= diff_blocks_count; ++i) {
+ for (i = 0; i < diff_blocks_count; ++i) {
int rc = ext4_fs_release_inode_block(
- inode_ref, old_blocks_count - i);
+ inode_ref, new_blocks_count + i);
if (rc != EOK)
return rc;
}
projects / lwext4.git / blobdiff