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-rw-r--r--lib/ext2fs/alloc_tables.c122
-rw-r--r--lib/ext2fs/closefs.c5
-rw-r--r--lib/ext2fs/ext2_fs.h6
-rw-r--r--lib/ext2fs/initialize.c6
4 files changed, 133 insertions, 6 deletions
diff --git a/lib/ext2fs/alloc_tables.c b/lib/ext2fs/alloc_tables.c
index 290e54b2..bee02f31 100644
--- a/lib/ext2fs/alloc_tables.c
+++ b/lib/ext2fs/alloc_tables.c
@@ -27,18 +27,88 @@
#include "ext2_fs.h"
#include "ext2fs.h"
+void ext2fs_bgd_set_flex_meta_flag(ext2_filsys fs, blk_t block)
+{
+ dgrp_t group;
+
+ group = ext2fs_group_of_blk(fs, block);
+ if (!(fs->group_desc[group].bg_flags & EXT2_BG_FLEX_METADATA))
+ fs->group_desc[group].bg_flags |= EXT2_BG_FLEX_METADATA;
+}
+
+/*
+ * This routine searches for free blocks that can allocate a full
+ * group of bitmaps or inode tables for a flexbg group. Returns the
+ * block number with a correct offset were the bitmaps and inode
+ * tables can be allocated continously and in order.
+ */
+blk_t ext2fs_flexbg_offset(ext2_filsys fs, dgrp_t group, blk_t start_blk,
+ ext2fs_block_bitmap bmap, int offset, int size)
+{
+ int flexbg, flexbg_size, elem_size;
+ blk_t last_blk, first_free = 0;
+ dgrp_t last_grp;
+
+ flexbg_size = 1 << fs->super->s_log_groups_per_flex;
+ flexbg = group / flexbg_size;
+
+ if (size > fs->super->s_blocks_per_group / 8)
+ size = fs->super->s_blocks_per_group / 8;
+
+ /*
+ * Dont do a long search if the previous block
+ * search is still valid.
+ */
+ if (start_blk && group % flexbg_size) {
+ if (size > flexbg_size)
+ elem_size = fs->inode_blocks_per_group;
+ else
+ elem_size = 1;
+ if (ext2fs_test_block_bitmap_range(bmap, start_blk + elem_size,
+ size))
+ return start_blk + elem_size;
+ }
+
+ start_blk = ext2fs_group_first_block(fs, flexbg_size * flexbg);
+ last_grp = group | (flexbg_size - 1);
+ if (last_grp > fs->group_desc_count)
+ last_grp = fs->group_desc_count;
+ last_blk = ext2fs_group_last_block(fs, last_grp);
+
+ /* Find the first available block */
+ if (ext2fs_get_free_blocks(fs, start_blk, last_blk, 1, bmap,
+ &first_free))
+ return first_free;
+
+ if (ext2fs_get_free_blocks(fs, first_free + offset, last_blk, size,
+ bmap, &first_free))
+ return first_free;
+
+ return first_free;
+}
+
errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
ext2fs_block_bitmap bmap)
{
errcode_t retval;
blk_t group_blk, start_blk, last_blk, new_blk, blk;
- int j;
+ dgrp_t last_grp;
+ int j, rem_grps, flexbg_size = 0;
group_blk = ext2fs_group_first_block(fs, group);
last_blk = ext2fs_group_last_block(fs, group);
if (!bmap)
bmap = fs->block_map;
+
+ if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
+ flexbg_size = 1 << fs->super->s_log_groups_per_flex;
+ last_grp = group | (flexbg_size - 1);
+ rem_grps = last_grp - group;
+ if (last_grp > fs->group_desc_count)
+ last_grp = fs->group_desc_count;
+ }
/*
* Allocate the block and inode bitmaps, if necessary
@@ -56,6 +126,15 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
} else
start_blk = group_blk;
+ if (flexbg_size) {
+ int prev_block = 0;
+ if (group && fs->group_desc[group-1].bg_block_bitmap)
+ prev_block = fs->group_desc[group-1].bg_block_bitmap;
+ start_blk = ext2fs_flexbg_offset(fs, group, prev_block, bmap,
+ 0, rem_grps);
+ last_blk = ext2fs_group_last_block(fs, last_grp);
+ }
+
if (!fs->group_desc[group].bg_block_bitmap) {
retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
1, bmap, &new_blk);
@@ -66,6 +145,21 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
return retval;
ext2fs_mark_block_bitmap(bmap, new_blk);
fs->group_desc[group].bg_block_bitmap = new_blk;
+ if (flexbg_size) {
+ dgrp_t tmp = ext2fs_group_of_blk(fs, new_blk);
+ ext2fs_bgd_set_flex_meta_flag(fs, new_blk);
+ fs->group_desc[tmp].bg_free_blocks_count--;
+ fs->super->s_free_blocks_count--;
+ }
+ }
+
+ if (flexbg_size) {
+ int prev_block = 0;
+ if (group && fs->group_desc[group-1].bg_inode_bitmap)
+ prev_block = fs->group_desc[group-1].bg_inode_bitmap;
+ start_blk = ext2fs_flexbg_offset(fs, group, prev_block, bmap,
+ flexbg_size, rem_grps);
+ last_blk = ext2fs_group_last_block(fs, last_grp);
}
if (!fs->group_desc[group].bg_inode_bitmap) {
@@ -78,11 +172,28 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
return retval;
ext2fs_mark_block_bitmap(bmap, new_blk);
fs->group_desc[group].bg_inode_bitmap = new_blk;
+ if (flexbg_size) {
+ dgrp_t tmp = ext2fs_group_of_blk(fs, new_blk);
+ ext2fs_bgd_set_flex_meta_flag(fs, new_blk);
+ fs->group_desc[tmp].bg_free_blocks_count--;
+ fs->super->s_free_blocks_count--;
+ }
}
/*
* Allocate the inode table
*/
+ if (flexbg_size) {
+ int prev_block = 0;
+ if (group && fs->group_desc[group-1].bg_inode_table)
+ prev_block = fs->group_desc[group-1].bg_inode_table;
+ group_blk = ext2fs_flexbg_offset(fs, group, prev_block, bmap,
+ flexbg_size * 2,
+ fs->inode_blocks_per_group *
+ rem_grps);
+ last_blk = ext2fs_group_last_block(fs, last_grp);
+ }
+
if (!fs->group_desc[group].bg_inode_table) {
retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
fs->inode_blocks_per_group,
@@ -91,8 +202,15 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
return retval;
for (j=0, blk = new_blk;
j < fs->inode_blocks_per_group;
- j++, blk++)
+ j++, blk++) {
ext2fs_mark_block_bitmap(bmap, blk);
+ if (flexbg_size) {
+ dgrp_t tmp = ext2fs_group_of_blk(fs, blk);
+ ext2fs_bgd_set_flex_meta_flag(fs, blk);
+ fs->group_desc[tmp].bg_free_blocks_count--;
+ fs->super->s_free_blocks_count--;
+ }
+ }
fs->group_desc[group].bg_inode_table = new_blk;
}
fs->group_desc[group].bg_checksum =
diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c
index 659ee27f..86ef29af 100644
--- a/lib/ext2fs/closefs.c
+++ b/lib/ext2fs/closefs.c
@@ -100,8 +100,9 @@ int ext2fs_super_and_bgd_loc(ext2_filsys fs,
numblocks--;
}
}
-
- numblocks -= 2 + fs->inode_blocks_per_group;
+
+ if (!fs->super->s_log_groups_per_flex)
+ numblocks -= 2 + fs->inode_blocks_per_group;
if (ret_super_blk)
*ret_super_blk = super_blk;
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 412b49b7..caaeba27 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -174,6 +174,7 @@ struct ext4_group_desc
#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
+#define EXT2_BG_FLEX_METADATA 0x0008 /* FLEX_BG block group contains meta-data */
/*
* Data structures used by the directory indexing feature
@@ -598,7 +599,10 @@ struct ext2_super_block {
__u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
__u64 s_mmp_block; /* Block for multi-mount protection */
__u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
- __u32 s_reserved[163]; /* Padding to the end of the block */
+ __u8 s_log_groups_per_flex; /* FLEX_BG group size */
+ __u8 s_reserved_char_pad;
+ __u16 s_reserved_pad; /* Padding to next 32bits */
+ __u32 s_reserved[162]; /* Padding to the end of the block */
};
/*
diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index 1916655b..c3939e5e 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -159,6 +159,7 @@ errcode_t ext2fs_initialize(const char *name, int flags,
set_field(s_raid_stride, 0); /* default stride size: 0 */
set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */
set_field(s_flags, 0);
+ set_field(s_log_groups_per_flex, 0);
if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
retval = EXT2_ET_UNSUPP_FEATURE;
goto cleanup;
@@ -366,7 +367,10 @@ ipg_retry:
* group, and fill in the correct group statistics for group.
* Note that although the block bitmap, inode bitmap, and
* inode table have not been allocated (and in fact won't be
- * by this routine), they are accounted for nevertheless.
+ * by this routine), they are accounted for nevertheless. If
+ * FLEX_BG meta-data grouping is used, only account for the
+ * superblock and group descriptors (the inode tables and
+ * bitmaps will be accounted for when allocated).
*/
super->s_free_blocks_count = 0;
for (i = 0; i < fs->group_desc_count; i++) {
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