From 22fd13fde5213cf8bdcf4c372da5fc739c69b1bd Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Thu, 31 May 2012 16:26:12 -0700 Subject: [PATCH] fat: mark superblock as dirty less often Preparation for further changes. It touches few functions in fatent.c and prevents them from marking the superblock as dirty unnecessarily often. Namely, instead of marking it as dirty in the internal tight loops - do it only once at the end of the functions. And instead of marking it as dirty while holding the FAT table lock, do it outside the lock. The reason for this patch is that marking the superblock as dirty will soon become a little bit heavier operation, so it is cleaner to do this only when it is necessary. Signed-off-by: Artem Bityutskiy Cc: OGAWA Hirofumi Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fat/fatent.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c index e49d27463b671..81815487e04d1 100644 --- a/fs/fat/fatent.c +++ b/fs/fat/fatent.c @@ -503,7 +503,6 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster) sbi->prev_free = entry; if (sbi->free_clusters != -1) sbi->free_clusters--; - mark_fsinfo_dirty(sb); cluster[idx_clus] = entry; idx_clus++; @@ -525,11 +524,11 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster) /* Couldn't allocate the free entries */ sbi->free_clusters = 0; sbi->free_clus_valid = 1; - mark_fsinfo_dirty(sb); err = -ENOSPC; out: unlock_fat(sbi); + mark_fsinfo_dirty(sb); fatent_brelse(&fatent); if (!err) { if (inode_needs_sync(inode)) @@ -554,7 +553,7 @@ int fat_free_clusters(struct inode *inode, int cluster) struct fat_entry fatent; struct buffer_head *bhs[MAX_BUF_PER_PAGE]; int i, err, nr_bhs; - int first_cl = cluster; + int first_cl = cluster, dirty_fsinfo = 0; nr_bhs = 0; fatent_init(&fatent); @@ -592,7 +591,7 @@ int fat_free_clusters(struct inode *inode, int cluster) ops->ent_put(&fatent, FAT_ENT_FREE); if (sbi->free_clusters != -1) { sbi->free_clusters++; - mark_fsinfo_dirty(sb); + dirty_fsinfo = 1; } if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) { @@ -622,6 +621,8 @@ error: for (i = 0; i < nr_bhs; i++) brelse(bhs[i]); unlock_fat(sbi); + if (dirty_fsinfo) + mark_fsinfo_dirty(sb); return err; } -- 2.39.5