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Date: Fri, 25 Feb 2011 21:50:24 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH] Add basic BIGALLOC support for cluster-based allocation
This adds the superblock fields needed so that dumpe2fs works and the
code points and renames the superblock fields from describing
fragments to clusters.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
debugfs/set_fields.c | 4 ++--
e2fsck/super.c | 23 ++++++++---------------
lib/e2p/feature.c | 2 ++
lib/e2p/ls.c | 14 ++++++++++++--
lib/ext2fs/ext2_fs.h | 25 +++++++++++--------------
lib/ext2fs/ext2fs.h | 4 ++--
lib/ext2fs/initialize.c | 11 ++++-------
lib/ext2fs/openfs.c | 2 +-
lib/ext2fs/swapfs.c | 4 ++--
lib/ext2fs/tst_super_size.c | 4 ++--
misc/mke2fs.c | 24 ++++++++++++++++--------
11 files changed, 62 insertions(+), 55 deletions(-)
diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
index 3b40117..9d7099b 100644
--- a/debugfs/set_fields.c
+++ b/debugfs/set_fields.c
@@ -74,9 +74,9 @@ static struct field_set_info super_fields[] = {
{ "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
{ "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
{ "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
- { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
+ { "log_cluster_size", &set_sb.s_log_cluster_size, 4, parse_int },
{ "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
- { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
+ { "clusters_per_group", &set_sb.s_clusters_per_group, 4, parse_uint },
{ "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
{ "mtime", &set_sb.s_mtime, 4, parse_time },
{ "wtime", &set_sb.s_wtime, 4, parse_time },
diff --git a/e2fsck/super.c b/e2fsck/super.c
index accc2f1..82c07b2 100644
--- a/e2fsck/super.c
+++ b/e2fsck/super.c
@@ -501,9 +501,12 @@ void check_super_block(e2fsck_t ctx)
check_super_value(ctx, "log_block_size", sb->s_log_block_size,
MIN_CHECK | MAX_CHECK, 0,
EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
- check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
- MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size);
- check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
+ check_super_value(ctx, "log_cluster_size",
+ sb->s_log_cluster_size,
+ MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
+ (EXT2_MAX_CLUSTER_LOG_SIZE -
+ EXT2_MIN_CLUSTER_LOG_SIZE));
+ check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group,
MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group,
bpg_max);
check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
@@ -541,24 +544,14 @@ void check_super_block(e2fsck_t ctx)
}
}
- if (sb->s_log_block_size != (__u32) sb->s_log_frag_size) {
+ if (sb->s_log_block_size != (__u32) sb->s_log_cluster_size) {
pctx.blk = EXT2_BLOCK_SIZE(sb);
- pctx.blk2 = EXT2_FRAG_SIZE(sb);
+ pctx.blk2 = EXT2_CLUSTER_SIZE(sb);
fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
- should_be = sb->s_frags_per_group >>
- (sb->s_log_block_size - sb->s_log_frag_size);
- if (sb->s_blocks_per_group != should_be) {
- pctx.blk = sb->s_blocks_per_group;
- pctx.blk2 = should_be;
- fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
- ctx->flags |= E2F_FLAG_ABORT;
- return;
- }
-
should_be = (sb->s_log_block_size == 0) ? 1 : 0;
if (sb->s_first_data_block != should_be) {
pctx.blk = sb->s_first_data_block;
diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
index 9324199..16fba53 100644
--- a/lib/e2p/feature.c
+++ b/lib/e2p/feature.c
@@ -57,6 +57,8 @@ static struct feature feature_list[] = {
"extra_isize" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
"quota" },
+ { E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
+ "bigalloc"},
{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
"compression" },
diff --git a/lib/e2p/ls.c b/lib/e2p/ls.c
index 8b8360a..04a2c71 100644
--- a/lib/e2p/ls.c
+++ b/lib/e2p/ls.c
@@ -229,12 +229,22 @@ void list_super2(struct ext2_super_block * sb, FILE *f)
fprintf(f, "Free inodes: %u\n", sb->s_free_inodes_count);
fprintf(f, "First block: %u\n", sb->s_first_data_block);
fprintf(f, "Block size: %u\n", EXT2_BLOCK_SIZE(sb));
- fprintf(f, "Fragment size: %u\n", EXT2_FRAG_SIZE(sb));
+ if (sb->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_BIGALLOC)
+ fprintf(f, "Cluster size: %u\n",
+ EXT2_CLUSTER_SIZE(sb));
+ else
+ fprintf(f, "Fragment size: %u\n",
+ EXT2_CLUSTER_SIZE(sb));
if (sb->s_reserved_gdt_blocks)
fprintf(f, "Reserved GDT blocks: %u\n",
sb->s_reserved_gdt_blocks);
fprintf(f, "Blocks per group: %u\n", sb->s_blocks_per_group);
- fprintf(f, "Fragments per group: %u\n", sb->s_frags_per_group);
+ if (sb->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_BIGALLOC)
+ fprintf(f, "Clusters per group: %u\n",
+ sb->s_clusters_per_group);
+ else
+ fprintf(f, "Fragments per group: %u\n",
+ sb->s_clusters_per_group);
fprintf(f, "Inodes per group: %u\n", sb->s_inodes_per_group);
fprintf(f, "Inode blocks per group: %u\n", inode_blocks_per_group);
if (sb->s_raid_stride)
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index f396a10..b4fc6d9 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -98,18 +98,15 @@
#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
/*
- * Macro-instructions used to manage fragments
+ * Macro-instructions used to manage allocation clusters
*/
-#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
-#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
-#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
-#ifdef __KERNEL__
-# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
-# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
-#else
-# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
-# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
-#endif
+#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
+#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */
+#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE
+#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE)
+#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \
+ (s)->s_log_cluster_size)
+#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10)
/*
* ACL structures
@@ -518,9 +515,9 @@ struct ext2_super_block {
__u32 s_free_inodes_count; /* Free inodes count */
__u32 s_first_data_block; /* First Data Block */
__u32 s_log_block_size; /* Block size */
- __s32 s_log_frag_size; /* Fragment size */
+ __s32 s_log_cluster_size; /* Allocation cluster size */
__u32 s_blocks_per_group; /* # Blocks per group */
- __u32 s_frags_per_group; /* # Fragments per group */
+ __u32 s_clusters_per_group; /* # Fragments per group */
__u32 s_inodes_per_group; /* # Inodes per group */
__u32 s_mtime; /* Mount time */
__u32 s_wtime; /* Write time */
@@ -675,6 +672,7 @@ struct ext2_super_block {
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
+#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
@@ -688,7 +686,6 @@ struct ext2_super_block {
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
-
#define EXT2_FEATURE_COMPAT_SUPP 0
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index cf76562..516eb1a 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -195,7 +195,7 @@ struct struct_ext2_filsys {
char * device_name;
struct ext2_super_block * super;
unsigned int blocksize;
- int fragsize;
+ int clustersize;
dgrp_t group_desc_count;
unsigned long desc_blocks;
struct ext2_group_desc * group_desc;
@@ -545,7 +545,7 @@ typedef struct ext2_icount *ext2_icount_t;
* to ext2fs_openfs()
*/
#define EXT2_LIB_SOFTSUPP_INCOMPAT (0)
-#define EXT2_LIB_SOFTSUPP_RO_COMPAT (0)
+#define EXT2_LIB_SOFTSUPP_RO_COMPAT (EXT4_FEATURE_RO_COMPAT_BIGALLOC)
/*
* function prototypes
diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index cba2453..c109d08 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -83,7 +83,6 @@ errcode_t ext2fs_initialize(const char *name, int flags,
ext2_filsys fs;
errcode_t retval;
struct ext2_super_block *super;
- int frags_per_block;
unsigned int rem;
unsigned int overhead = 0;
unsigned int ipg;
@@ -136,7 +135,7 @@ errcode_t ext2fs_initialize(const char *name, int flags,
super->s_state = EXT2_VALID_FS;
set_field(s_log_block_size, 0); /* default blocksize: 1024 bytes */
- set_field(s_log_frag_size, 0); /* default fragsize: 1024 bytes */
+ set_field(s_log_cluster_size, 0);
set_field(s_first_data_block, super->s_log_block_size ? 0 : 1);
set_field(s_max_mnt_count, 0);
set_field(s_errors, EXT2_ERRORS_DEFAULT);
@@ -179,14 +178,13 @@ errcode_t ext2fs_initialize(const char *name, int flags,
super->s_creator_os = CREATOR_OS;
fs->blocksize = EXT2_BLOCK_SIZE(super);
- fs->fragsize = EXT2_FRAG_SIZE(super);
- frags_per_block = fs->blocksize / fs->fragsize;
+ fs->clustersize = EXT2_CLUSTER_SIZE(super);
/* default: (fs->blocksize*8) blocks/group, up to 2^16 (GDT limit) */
set_field(s_blocks_per_group, fs->blocksize * 8);
if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
- super->s_frags_per_group = super->s_blocks_per_group * frags_per_block;
+ super->s_clusters_per_group = super->s_blocks_per_group;
super->s_blocks_count = param->s_blocks_count;
super->s_r_blocks_count = param->s_r_blocks_count;
@@ -239,8 +237,7 @@ retry:
/* Try again with slightly different parameters */
super->s_blocks_per_group -= 8;
super->s_blocks_count = param->s_blocks_count;
- super->s_frags_per_group = super->s_blocks_per_group *
- frags_per_block;
+ super->s_clusters_per_group = super->s_blocks_per_group;
goto retry;
} else {
retval = EXT2_ET_TOO_MANY_INODES;
diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
index d638da0..a20b923 100644
--- a/lib/ext2fs/openfs.c
+++ b/lib/ext2fs/openfs.c
@@ -244,7 +244,7 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
- fs->fragsize = EXT2_FRAG_SIZE(fs->super);
+ fs->clustersize = EXT2_CLUSTER_SIZE(fs->super);
fs->inode_blocks_per_group = ((EXT2_INODES_PER_GROUP(fs->super) *
EXT2_INODE_SIZE(fs->super) +
EXT2_BLOCK_SIZE(fs->super) - 1) /
diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
index 15ff6fc..52b0fa9 100644
--- a/lib/ext2fs/swapfs.c
+++ b/lib/ext2fs/swapfs.c
@@ -31,9 +31,9 @@ void ext2fs_swap_super(struct ext2_super_block * sb)
sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
- sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
+ sb->s_log_cluster_size = ext2fs_swab32(sb->s_log_cluster_size);
sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
- sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
+ sb->s_clusters_per_group = ext2fs_swab32(sb->s_clusters_per_group);
sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
sb->s_mtime = ext2fs_swab32(sb->s_mtime);
sb->s_wtime = ext2fs_swab32(sb->s_wtime);
diff --git a/lib/ext2fs/tst_super_size.c b/lib/ext2fs/tst_super_size.c
index a3a5b44..6fffcfd 100644
--- a/lib/ext2fs/tst_super_size.c
+++ b/lib/ext2fs/tst_super_size.c
@@ -50,9 +50,9 @@ void check_superblock_fields()
check_field(s_free_inodes_count);
check_field(s_first_data_block);
check_field(s_log_block_size);
- check_field(s_log_frag_size);
+ check_field(s_log_cluster_size);
check_field(s_blocks_per_group);
- check_field(s_frags_per_group);
+ check_field(s_clusters_per_group);
check_field(s_inodes_per_group);
check_field(s_mtime);
check_field(s_wtime);
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index a5cf16b..eace0d3 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -616,8 +616,13 @@ static void show_stats(ext2_filsys fs)
printf("\n");
printf(_("Block size=%u (log=%u)\n"), fs->blocksize,
s->s_log_block_size);
- printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize,
- s->s_log_frag_size);
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+ printf(_("Cluster size=%u (log=%u)\n"),
+ fs->clustersize, s->s_log_cluster_size);
+ else
+ printf(_("Fragment size=%u (log=%u)\n"), fs->clustersize,
+ s->s_log_cluster_size);
printf(_("Stride=%u blocks, Stripe width=%u blocks\n"),
s->s_raid_stride, s->s_raid_stripe_width);
printf(_("%u inodes, %u blocks\n"), s->s_inodes_count,
@@ -634,8 +639,13 @@ static void show_stats(ext2_filsys fs)
printf(_("%u block groups\n"), fs->group_desc_count);
else
printf(_("%u block group\n"), fs->group_desc_count);
- printf(_("%u blocks per group, %u fragments per group\n"),
- s->s_blocks_per_group, s->s_frags_per_group);
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+ printf(_("%u blocks per group, %u clusters per group\n"),
+ s->s_blocks_per_group, s->s_clusters_per_group);
+ else
+ printf(_("%u blocks per group, %u fragments per group\n"),
+ s->s_blocks_per_group, s->s_clusters_per_group);
printf(_("%u inodes per group\n"), s->s_inodes_per_group);
if (fs->group_desc_count == 1) {
@@ -1309,8 +1319,6 @@ static void PRS(int argc, char *argv[])
optarg);
exit(1);
}
- fs_param.s_log_frag_size =
- int_log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
fprintf(stderr, _("Warning: fragments not supported. "
"Ignoring -f option\n"));
break;
@@ -1542,7 +1550,7 @@ static void PRS(int argc, char *argv[])
check_plausibility(device_name);
check_mount(device_name, force, _("filesystem"));
- fs_param.s_log_frag_size = fs_param.s_log_block_size;
+ fs_param.s_log_cluster_size = fs_param.s_log_block_size;
if (noaction && fs_param.s_blocks_count) {
dev_size = fs_param.s_blocks_count;
@@ -1780,7 +1788,7 @@ got_size:
inode_ratio = blocksize;
}
- fs_param.s_log_frag_size = fs_param.s_log_block_size =
+ fs_param.s_log_cluster_size = fs_param.s_log_block_size =
int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
#ifdef HAVE_BLKID_PROBE_GET_TOPOLOGY
--
1.7.3.1
--
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