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From 1aecdcc5c805e5e2114dd14877e9e1771fb519bf Mon Sep 17 00:00:00 2001
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From: Theodore Ts'o <tytso@mit.edu>
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Date: Thu, 16 Jan 2020 19:17:26 -0500
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Subject: [PATCH 04/46] libext2fs: don't needlessly byte swap the group
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descriptors in ext2fs_flush
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Content-Type: text/plain
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If the EXT2_FLAG_SUPER_ONLY is set, there's no reason to allocate the
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shadow block group descriptors and byte swap the group descriptors.
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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---
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lib/ext2fs/closefs.c | 24 ++++++++++++++----------
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1 file changed, 14 insertions(+), 10 deletions(-)
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diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c
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index 6814cdc3..69cbdd8c 100644
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--- a/lib/ext2fs/closefs.c
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+++ b/lib/ext2fs/closefs.c
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@@ -331,20 +331,24 @@ errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
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#ifdef WORDS_BIGENDIAN
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retval = EXT2_ET_NO_MEMORY;
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retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
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- if (retval)
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- goto errout;
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- retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
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- &group_shadow);
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if (retval)
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goto errout;
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memcpy(super_shadow, fs->super, sizeof(struct ext2_super_block));
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- memcpy(group_shadow, fs->group_desc, (size_t) fs->blocksize *
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- fs->desc_blocks);
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-
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ext2fs_swap_super(super_shadow);
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- for (j = 0; j < fs->group_desc_count; j++) {
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- gdp = ext2fs_group_desc(fs, group_shadow, j);
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- ext2fs_swap_group_desc2(fs, gdp);
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+
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+ if (((fs->flags & EXT2_FLAG_SUPER_ONLY) == 0) &&
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+ !ext2fs_has_feature_journal_dev(fs->super)) {
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+ retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
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+ &group_shadow);
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+ if (retval)
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+ goto errout;
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+ memcpy(group_shadow, fs->group_desc, (size_t) fs->blocksize *
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+ fs->desc_blocks);
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+
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+ for (j = 0; j < fs->group_desc_count; j++) {
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+ gdp = ext2fs_group_desc(fs, group_shadow, j);
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+ ext2fs_swap_group_desc2(fs, gdp);
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+ }
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}
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#else
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super_shadow = fs->super;
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--
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2.35.1
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