diff options
Diffstat (limited to 'fs/nilfs2/segment.c')
-rw-r--r-- | fs/nilfs2/segment.c | 146 |
1 files changed, 77 insertions, 69 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c index 17584c52448..6a7dbd8451d 100644 --- a/fs/nilfs2/segment.c +++ b/fs/nilfs2/segment.c @@ -32,6 +32,7 @@ #include <linux/kthread.h> #include <linux/crc32.h> #include <linux/pagevec.h> +#include <linux/slab.h> #include "nilfs.h" #include "btnode.h" #include "page.h" @@ -141,7 +142,7 @@ 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 +202,7 @@ 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. @@ -1510,6 +1511,12 @@ static int nilfs_segctor_collect(struct nilfs_sc_info *sci, if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE) break; + nilfs_clear_logs(&sci->sc_segbufs); + + err = nilfs_segctor_extend_segments(sci, nilfs, nadd); + if (unlikely(err)) + return err; + if (sci->sc_stage.flags & NILFS_CF_SUFREED) { err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, sci->sc_freesegs, @@ -1517,12 +1524,6 @@ static int nilfs_segctor_collect(struct nilfs_sc_info *sci, NULL); WARN_ON(err); /* do not happen */ } - nilfs_clear_logs(&sci->sc_segbufs); - - err = nilfs_segctor_extend_segments(sci, nilfs, nadd); - if (unlikely(err)) - return err; - nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); sci->sc_stage = prev_stage; } @@ -1764,14 +1765,9 @@ 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; } @@ -1902,8 +1898,7 @@ static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, list_splice_tail_init(&sci->sc_write_logs, &logs); ret = nilfs_wait_on_logs(&logs); - if (ret) - nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret); + nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret ? : err); list_splice_tail_init(&sci->sc_segbufs, &logs); nilfs_cancel_segusage(&logs, nilfs->ns_sufile); @@ -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); @@ -2829,7 +2830,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) || sci->sc_seq_request != sci->sc_seq_done); spin_unlock(&sci->sc_state_lock); - if (flag || nilfs_segctor_confirm(sci)) + if (flag || !nilfs_segctor_confirm(sci)) nilfs_segctor_write_out(sci); WARN_ON(!list_empty(&sci->sc_copied_buffers)); @@ -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; |