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[LogFS] Only write journal if dirty

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This prevents unnecessary journal writes.  More importantly it prevents
an oops due to a journal write on failed mount.
This commit is contained in:
Joern Engel
2010-03-04 21:36:19 +01:00
parent 9421502b4f
commit c6d3830140
6 changed files with 19 additions and 13 deletions
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7
fs/logfs/segment.c
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@@ -352,7 +352,8 @@ int logfs_segment_write(struct inode *inode, struct page *page,
int ret;
void *buf;
BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
super->s_flags |= LOGFS_SB_FLAG_DIRTY;
BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
do_compress = logfs_inode(inode)->li_flags & LOGFS_IF_COMPRESSED;
if (shadow->gc_level != 0) {
/* temporarily disable compression for indirect blocks */
@@ -653,11 +654,13 @@ int logfs_segment_read(struct inode *inode, struct page *page,
int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow)
{
struct super_block *sb = inode->i_sb;
struct logfs_super *super = logfs_super(sb);
struct logfs_object_header h;
u16 len;
int err;
BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
super->s_flags |= LOGFS_SB_FLAG_DIRTY;
BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
BUG_ON(shadow->old_ofs & LOGFS_FULLY_POPULATED);
if (!shadow->old_ofs)
return 0;