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-rw-r--r--fs/nilfs2/segment.c128
1 files changed, 68 insertions, 60 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 105b508b47a..69576a95e13 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -141,7 +141,7 @@ int nilfs_init_transaction_cache(void)
}
/**
- * nilfs_detroy_transaction_cache - destroy the cache for transaction info
+ * nilfs_destroy_transaction_cache - destroy the cache for transaction info
*
* nilfs_destroy_transaction_cache() frees the slab cache for the struct
* nilfs_transaction_info.
@@ -201,7 +201,7 @@ static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
* This function allocates a nilfs_transaction_info struct to keep context
* information on it. It is initialized and hooked onto the current task in
* the outermost call. If a pre-allocated struct is given to @ti, it is used
- * instead; othewise a new struct is assigned from a slab.
+ * instead; otherwise a new struct is assigned from a slab.
*
* When @vacancy_check flag is set, this function will check the amount of
* free space, and will wait for the GC to reclaim disk space if low capacity.
@@ -1764,14 +1764,9 @@ static int nilfs_segctor_prepare_write(struct nilfs_sc_info *sci,
static int nilfs_segctor_write(struct nilfs_sc_info *sci,
struct the_nilfs *nilfs)
{
- struct nilfs_segment_buffer *segbuf;
- int ret = 0;
+ int ret;
- list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_segbuf_write(segbuf, nilfs);
- if (ret)
- break;
- }
+ ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
return ret;
}
@@ -1937,8 +1932,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
{
struct nilfs_segment_buffer *segbuf;
struct page *bd_page = NULL, *fs_page = NULL;
- struct nilfs_sb_info *sbi = sci->sc_sbi;
- struct the_nilfs *nilfs = sbi->s_nilfs;
+ struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
int update_sr = (sci->sc_super_root != NULL);
list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
@@ -2020,7 +2014,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
if (update_sr) {
nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
- sbi->s_super->s_dirt = 1;
+ set_nilfs_sb_dirty(nilfs);
clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
@@ -2220,7 +2214,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
}
/**
- * nilfs_secgtor_start_timer - set timer of background write
+ * nilfs_segctor_start_timer - set timer of background write
* @sci: nilfs_sc_info
*
* If the timer has already been set, it ignores the new request.
@@ -2425,43 +2419,43 @@ 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 +2466,37 @@ 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 +2527,6 @@ 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 +2547,8 @@ 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;
@@ -2560,6 +2558,16 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(sci->sc_interval);
}
+ if (nilfs_test_opt(sbi, DISCARD)) {
+ int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
+ sci->sc_nfreesegs);
+ if (ret) {
+ printk(KERN_WARNING
+ "NILFS warning: error %d on discard request, "
+ "turning discards off for the device\n", ret);
+ nilfs_clear_opt(sbi, DISCARD);
+ }
+ }
out_unlock:
sci->sc_freesegs = NULL;
@@ -2573,13 +2581,9 @@ 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.
@@ -2635,6 +2639,7 @@ static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
static int nilfs_segctor_thread(void *arg)
{
struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
+ struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
struct timer_list timer;
int timeout = 0;
@@ -2680,7 +2685,6 @@ static int nilfs_segctor_thread(void *arg)
} else {
DEFINE_WAIT(wait);
int should_sleep = 1;
- struct the_nilfs *nilfs;
prepare_to_wait(&sci->sc_wait_daemon, &wait,
TASK_INTERRUPTIBLE);
@@ -2701,8 +2705,8 @@ static int nilfs_segctor_thread(void *arg)
finish_wait(&sci->sc_wait_daemon, &wait);
timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
time_after_eq(jiffies, sci->sc_timer->expires));
- nilfs = sci->sc_sbi->s_nilfs;
- if (sci->sc_super->s_dirt && nilfs_sb_need_update(nilfs))
+
+ if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
set_nilfs_discontinued(nilfs);
}
goto loop;
@@ -2797,12 +2801,9 @@ 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);
@@ -2853,7 +2854,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
* @sbi: nilfs_sb_info
*
* nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info,
- * initilizes it, and starts the segment constructor.
+ * initializes it, and starts the segment constructor.
*
* Return Value: On success, 0 is returned. On error, one of the following
* negative error code is returned.
@@ -2865,8 +2866,15 @@ int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
- /* Each field of nilfs_segctor is cleared through the initialization
- of super-block info */
+ if (NILFS_SC(sbi)) {
+ /*
+ * This happens if the filesystem was remounted
+ * read/write after nilfs_error degenerated it into a
+ * read-only mount.
+ */
+ nilfs_detach_segment_constructor(sbi);
+ }
+
sbi->s_sc_info = nilfs_segctor_new(sbi);
if (!sbi->s_sc_info)
return -ENOMEM;