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Optimize g_journal's superblock update by noting that the summary

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information is neither read nor written so it need not be written
out when updating the superblock.

PR:           247425
Sponsored by: Netflix
This commit is contained in:
Kirk McKusick 2020-06-23 21:44:00 +00:00
parent d7fcdf5d48
commit 9407f25df2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362561
1 changed files with 8 additions and 6 deletions
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14
sys/geom/journal/g_journal_ufs.c
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@ -68,7 +68,6 @@ g_journal_ufs_clean(struct mount *mp)
static void
g_journal_ufs_dirty(struct g_consumer *cp)
{
struct fs_summary_info *fs_si;
struct fs *fs;
int error;
@ -81,15 +80,18 @@ g_journal_ufs_dirty(struct g_consumer *cp)
("g_journal_ufs_dirty: non-NULL fs %p\n", fs));
return;
}
/*
* Do not use or change summary information, so free it now
* to avoid unnecessarily writing it back out in ffs_sbput().
*/
g_free(fs->fs_csp);
g_free(fs->fs_si);
fs->fs_si = NULL;
GJ_DEBUG(0, "clean=%d flags=0x%x", fs->fs_clean, fs->fs_flags);
fs->fs_clean = 0;
fs->fs_flags |= FS_NEEDSFSCK | FS_UNCLEAN;
fs_si = fs->fs_si;
fs->fs_si = NULL;
error = ffs_sbput(cp, fs, fs->fs_sblockloc, g_use_g_write_data);
fs->fs_si = fs_si;
g_free(fs->fs_csp);
g_free(fs->fs_si);
g_free(fs);
if (error != 0) {
GJ_DEBUG(0, "Cannot mark file system %s as dirty "