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nilfs2: get rid of nilfs_segctor_req struct 

This will clean up nilfs_segctor_req struct and the obscure request
argument passed among private methods of segment constructor.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-01-26 15:20:15 +09:00
parent 086d1764b2
commit dcd7618695
2 changed files with 40 additions and 41 deletions
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79
fs/nilfs2/segment.c
View File

@ -2425,43 +2425,43 @@ int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
return err;
}
struct nilfs_segctor_req {
int mode;
__u32 seq_accepted;
int sc_err; /* construction failure */
int sb_err; /* super block writeback failure */
};
#define FLUSH_FILE_BIT (0x1) /* data file only */
#define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */
static void nilfs_segctor_accept(struct nilfs_sc_info *sci,
struct nilfs_segctor_req *req)
/**
* nilfs_segctor_accept - record accepted sequence count of log-write requests
* @sci: segment constructor object
*/
static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
{
req->sc_err = req->sb_err = 0;
spin_lock(&sci->sc_state_lock);
req->seq_accepted = sci->sc_seq_request;
sci->sc_seq_accepted = sci->sc_seq_request;
spin_unlock(&sci->sc_state_lock);
if (sci->sc_timer)
del_timer_sync(sci->sc_timer);
}
static void nilfs_segctor_notify(struct nilfs_sc_info *sci,
struct nilfs_segctor_req *req)
/**
* nilfs_segctor_notify - notify the result of request to caller threads
* @sci: segment constructor object
* @mode: mode of log forming
* @err: error code to be notified
*/
static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
{
/* Clear requests (even when the construction failed) */
spin_lock(&sci->sc_state_lock);
if (req->mode == SC_LSEG_SR) {
if (mode == SC_LSEG_SR) {
sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
sci->sc_seq_done = req->seq_accepted;
nilfs_segctor_wakeup(sci, req->sc_err ? : req->sb_err);
sci->sc_seq_done = sci->sc_seq_accepted;
nilfs_segctor_wakeup(sci, err);
sci->sc_flush_request = 0;
} else {
if (req->mode == SC_FLUSH_FILE)
if (mode == SC_FLUSH_FILE)
sci->sc_flush_request &= ~FLUSH_FILE_BIT;
else if (req->mode == SC_FLUSH_DAT)
else if (mode == SC_FLUSH_DAT)
sci->sc_flush_request &= ~FLUSH_DAT_BIT;
/* re-enable timer if checkpoint creation was not done */
@ -2472,30 +2472,37 @@ static void nilfs_segctor_notify(struct nilfs_sc_info *sci,
spin_unlock(&sci->sc_state_lock);
}
static int nilfs_segctor_construct(struct nilfs_sc_info *sci,
struct nilfs_segctor_req *req)
/**
* nilfs_segctor_construct - form logs and write them to disk
* @sci: segment constructor object
* @mode: mode of log forming
*/
static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
{
struct nilfs_sb_info *sbi = sci->sc_sbi;
struct the_nilfs *nilfs = sbi->s_nilfs;
int err = 0;
nilfs_segctor_accept(sci);
if (nilfs_discontinued(nilfs))
req->mode = SC_LSEG_SR;
if (!nilfs_segctor_confirm(sci)) {
err = nilfs_segctor_do_construct(sci, req->mode);
req->sc_err = err;
}
mode = SC_LSEG_SR;
if (!nilfs_segctor_confirm(sci))
err = nilfs_segctor_do_construct(sci, mode);
if (likely(!err)) {
if (req->mode != SC_FLUSH_DAT)
if (mode != SC_FLUSH_DAT)
atomic_set(&nilfs->ns_ndirtyblks, 0);
if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
nilfs_discontinued(nilfs)) {
down_write(&nilfs->ns_sem);
req->sb_err = nilfs_commit_super(sbi,
nilfs_altsb_need_update(nilfs));
err = nilfs_commit_super(
sbi, nilfs_altsb_need_update(nilfs));
up_write(&nilfs->ns_sem);
}
}
nilfs_segctor_notify(sci, mode, err);
return err;
}
@ -2526,7 +2533,6 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
struct nilfs_sc_info *sci = NILFS_SC(sbi);
struct the_nilfs *nilfs = sbi->s_nilfs;
struct nilfs_transaction_info ti;
struct nilfs_segctor_req req = { .mode = SC_LSEG_SR };
int err;
if (unlikely(!sci))
@ -2547,10 +2553,8 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
for (;;) {
nilfs_segctor_accept(sci, &req);
err = nilfs_segctor_construct(sci, &req);
err = nilfs_segctor_construct(sci, SC_LSEG_SR);
nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
nilfs_segctor_notify(sci, &req);
if (likely(!err))
break;
@ -2583,13 +2587,9 @@ static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
{
struct nilfs_sb_info *sbi = sci->sc_sbi;
struct nilfs_transaction_info ti;
struct nilfs_segctor_req req = { .mode = mode };
nilfs_transaction_lock(sbi, &ti, 0);
nilfs_segctor_accept(sci, &req);
nilfs_segctor_construct(sci, &req);
nilfs_segctor_notify(sci, &req);
nilfs_segctor_construct(sci, mode);
/*
* Unclosed segment should be retried. We do this using sc_timer.
@ -2807,12 +2807,9 @@ static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
do {
struct nilfs_sb_info *sbi = sci->sc_sbi;
struct nilfs_transaction_info ti;
struct nilfs_segctor_req req = { .mode = SC_LSEG_SR };
nilfs_transaction_lock(sbi, &ti, 0);
nilfs_segctor_accept(sci, &req);
ret = nilfs_segctor_construct(sci, &req);
nilfs_segctor_notify(sci, &req);
ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
nilfs_transaction_unlock(sbi);
} while (ret && retrycount-- > 0);

2
fs/nilfs2/segment.h
View File

@ -116,6 +116,7 @@ struct nilfs_segsum_pointer {
* @sc_wait_daemon: Daemon wait queue
* @sc_wait_task: Start/end wait queue to control segctord task
* @sc_seq_request: Request counter
* @sc_seq_accept: Accepted request count
* @sc_seq_done: Completion counter
* @sc_sync: Request of explicit sync operation
* @sc_interval: Timeout value of background construction
@ -169,6 +170,7 @@ struct nilfs_sc_info {
wait_queue_head_t sc_wait_task;
__u32 sc_seq_request;
__u32 sc_seq_accepted;
__u32 sc_seq_done;
int sc_sync;