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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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6
fs/logfs/gc.c
View File

@ -469,7 +469,7 @@ static void __logfs_gc_pass(struct super_block *sb, int target)
/* Sync in-memory state with on-medium state in case they
* diverged */
logfs_write_anchor(super->s_master_inode);
logfs_write_anchor(sb);
round += logfs_scan_some(sb);
if (no_free_segments(sb) >= target)
goto write_alias;
@ -613,8 +613,8 @@ void logfs_gc_pass(struct super_block *sb)
*/
if (super->s_dirty_used_bytes + super->s_dirty_free_bytes
+ LOGFS_MAX_OBJECTSIZE >= super->s_free_bytes)
logfs_write_anchor(super->s_master_inode);
__logfs_gc_pass(sb, logfs_super(sb)->s_total_levels);
logfs_write_anchor(sb);
__logfs_gc_pass(sb, super->s_total_levels);
logfs_wl_pass(sb);
logfs_journal_wl_pass(sb);
}

11
fs/logfs/journal.c
View File

@ -724,14 +724,17 @@ static int logfs_write_obj_aliases(struct super_block *sb)
* bit wasteful, but robustness is more important. With this we can *always*
* erase all journal segments except the one containing the most recent commit.
*/
void logfs_write_anchor(struct inode *inode)
void logfs_write_anchor(struct super_block *sb)
{
struct super_block *sb = inode->i_sb;
struct logfs_super *super = logfs_super(sb);
struct logfs_area *area = super->s_journal_area;
int i, err;
BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
if (!(super->s_flags & LOGFS_SB_FLAG_DIRTY))
return;
super->s_flags &= ~LOGFS_SB_FLAG_DIRTY;
BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
mutex_lock(&super->s_journal_mutex);
/* Do this first or suffer corruption */
@ -821,7 +824,7 @@ void do_logfs_journal_wl_pass(struct super_block *sb)
area->a_is_open = 0;
area->a_used_bytes = 0;
/* Write journal */
logfs_write_anchor(super->s_master_inode);
logfs_write_anchor(sb);
/* Write superblocks */
err = logfs_write_sb(sb);
BUG_ON(err);

4
fs/logfs/logfs.h
View File

@ -82,7 +82,7 @@
/* Read-only filesystem */
#define LOGFS_SB_FLAG_RO 0x0001
#define LOGFS_SB_FLAG_SEG_ALIAS 0x0002
#define LOGFS_SB_FLAG_DIRTY 0x0002
#define LOGFS_SB_FLAG_OBJ_ALIAS 0x0004
#define LOGFS_SB_FLAG_SHUTDOWN 0x0008
@ -526,7 +526,7 @@ void logfs_delete_inode(struct inode *inode);
void logfs_clear_inode(struct inode *inode);
/* journal.c */
void logfs_write_anchor(struct inode *inode);
void logfs_write_anchor(struct super_block *sb);
int logfs_init_journal(struct super_block *sb);
void logfs_cleanup_journal(struct super_block *sb);
int write_alias_journal(struct super_block *sb, u64 ino, u64 bix,

2
fs/logfs/readwrite.c
View File

@ -421,7 +421,7 @@ static void inode_write_block(struct logfs_block *block)
inode = block->inode;
if (inode->i_ino == LOGFS_INO_MASTER)
logfs_write_anchor(inode);
logfs_write_anchor(inode->i_sb);
else {
ret = __logfs_write_inode(inode, 0);
/* see indirect_write_block comment */

7
fs/logfs/segment.c
View File

@ -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;

2
fs/logfs/super.c
View File

@ -490,7 +490,7 @@ static void logfs_kill_sb(struct super_block *sb)
log_super("LogFS: Start unmounting\n");
/* Alias entries slow down mount, so evict as many as possible */
sync_filesystem(sb);
logfs_write_anchor(super->s_master_inode);
logfs_write_anchor(sb);
/*
* From this point on alias entries are simply dropped - and any