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Date: Tue, 20 Dec 2022 00:05:44 +1100
From: Li Dongyang <dongyangli@....com>
To: linux-ext4@...r.kernel.org
Cc: adilger@...ger.ca
Subject: [PATCH] e2fsck: optimize clone_file on large devices
When cloning multiply-claimed blocks for an inode,
clone_file() uses ext2fs_block_iterate3() to iterate
every block calling clone_file_block().
clone_file_block() calls check_if_fs_cluster(), even
the block is not on the block_dup_map, which could take
a long time on a large device.
Only check if it's metadata block when we need to clone
it.
Test block_metadata_map in check_if_fs_block()
and check_if_fs_cluster(), so we don't need to go over
each bg every time. The metadata blocks are already
marked in the bitmap.
Before this patch on a 500TB device with 3 files having
3 multiply-claimed blocks between them, pass1b is stuck
for more than 48 hours without progressing,
before e2fsck was terminated.
After this patch pass1b could finish in 180 seconds.
Signed-off-by: Li Dongyang <dongyangli@....com>
---
e2fsck/pass1b.c | 73 ++++++-------------------------------
tests/f_dup_resize/expect.1 | 3 +-
2 files changed, 13 insertions(+), 63 deletions(-)
diff --git a/e2fsck/pass1b.c b/e2fsck/pass1b.c
index 92c746c1d..950af5be0 100644
--- a/e2fsck/pass1b.c
+++ b/e2fsck/pass1b.c
@@ -90,7 +90,7 @@ static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
struct dup_inode *dp, char *block_buf);
static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
struct dup_inode *dp, char* block_buf);
-static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block);
+static int check_if_fs_block(e2fsck_t ctx, blk64_t block);
static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster);
static void pass1b(e2fsck_t ctx, char *block_buf);
@@ -815,8 +815,6 @@ static int clone_file_block(ext2_filsys fs,
should_write = 0;
c = EXT2FS_B2C(fs, blockcnt);
- if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
- is_meta = 1;
if (c == cs->dup_cluster && cs->alloc_block) {
new_block = cs->alloc_block;
@@ -894,6 +892,8 @@ cluster_alloc_ok:
return BLOCK_ABORT;
}
}
+ if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
+ is_meta = 1;
cs->save_dup_cluster = (is_meta ? NULL : p);
cs->save_blocknr = *block_nr;
*block_nr = new_block;
@@ -1021,37 +1021,9 @@ errout:
* This routine returns 1 if a block overlaps with one of the superblocks,
* group descriptors, inode bitmaps, or block bitmaps.
*/
-static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
+static int check_if_fs_block(e2fsck_t ctx, blk64_t block)
{
- ext2_filsys fs = ctx->fs;
- blk64_t first_block;
- dgrp_t i;
-
- first_block = fs->super->s_first_data_block;
- for (i = 0; i < fs->group_desc_count; i++) {
-
- /* Check superblocks/block group descriptors */
- if (ext2fs_bg_has_super(fs, i)) {
- if (test_block >= first_block &&
- (test_block <= first_block + fs->desc_blocks))
- return 1;
- }
-
- /* Check the inode table */
- if ((ext2fs_inode_table_loc(fs, i)) &&
- (test_block >= ext2fs_inode_table_loc(fs, i)) &&
- (test_block < (ext2fs_inode_table_loc(fs, i) +
- fs->inode_blocks_per_group)))
- return 1;
-
- /* Check the bitmap blocks */
- if ((test_block == ext2fs_block_bitmap_loc(fs, i)) ||
- (test_block == ext2fs_inode_bitmap_loc(fs, i)))
- return 1;
-
- first_block += fs->super->s_blocks_per_group;
- }
- return 0;
+ return ext2fs_test_block_bitmap2(ctx->block_metadata_map, block);
}
/*
@@ -1061,37 +1033,14 @@ static int check_if_fs_block(e2fsck_t ctx, blk64_t test_block)
static int check_if_fs_cluster(e2fsck_t ctx, blk64_t cluster)
{
ext2_filsys fs = ctx->fs;
- blk64_t first_block;
- dgrp_t i;
-
- first_block = fs->super->s_first_data_block;
- for (i = 0; i < fs->group_desc_count; i++) {
-
- /* Check superblocks/block group descriptors */
- if (ext2fs_bg_has_super(fs, i)) {
- if (cluster >= EXT2FS_B2C(fs, first_block) &&
- (cluster <= EXT2FS_B2C(fs, first_block +
- fs->desc_blocks)))
- return 1;
- }
+ blk64_t block = EXT2FS_C2B(fs, cluster);
+ int i;
- /* Check the inode table */
- if ((ext2fs_inode_table_loc(fs, i)) &&
- (cluster >= EXT2FS_B2C(fs,
- ext2fs_inode_table_loc(fs, i))) &&
- (cluster <= EXT2FS_B2C(fs,
- ext2fs_inode_table_loc(fs, i) +
- fs->inode_blocks_per_group - 1)))
+ for (i = 0; i < EXT2FS_CLUSTER_RATIO(fs); i++) {
+ if (ext2fs_test_block_bitmap2(ctx->block_metadata_map,
+ block + i))
return 1;
-
- /* Check the bitmap blocks */
- if ((cluster == EXT2FS_B2C(fs,
- ext2fs_block_bitmap_loc(fs, i))) ||
- (cluster == EXT2FS_B2C(fs,
- ext2fs_inode_bitmap_loc(fs, i))))
- return 1;
-
- first_block += fs->super->s_blocks_per_group;
}
+
return 0;
}
diff --git a/tests/f_dup_resize/expect.1 b/tests/f_dup_resize/expect.1
index e0d869795..8a2764d32 100644
--- a/tests/f_dup_resize/expect.1
+++ b/tests/f_dup_resize/expect.1
@@ -11,7 +11,8 @@ Pass 1D: Reconciling multiply-claimed blocks
(There are 1 inodes containing multiply-claimed blocks.)
File /debugfs (inode #12, mod time Mon Apr 11 00:00:00 2005)
- has 4 multiply-claimed block(s), shared with 1 file(s):
+ has 4 multiply-claimed block(s), shared with 2 file(s):
+ <filesystem metadata>
<The group descriptor inode> (inode #7, mod time Mon Apr 11 06:13:20 2005)
Clone multiply-claimed blocks? yes
--
2.37.3
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