diff options
Diffstat (limited to 'fs/gfs2/log.c')
| -rw-r--r-- | fs/gfs2/log.c | 1347 |
1 files changed, 1347 insertions, 0 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c new file mode 100644 index 0000000000..e5271ae87d --- /dev/null +++ b/fs/gfs2/log.c @@ -0,0 +1,1347 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. + */ + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> +#include <linux/gfs2_ondisk.h> +#include <linux/crc32.h> +#include <linux/crc32c.h> +#include <linux/delay.h> +#include <linux/kthread.h> +#include <linux/freezer.h> +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/writeback.h> +#include <linux/list_sort.h> + +#include "gfs2.h" +#include "incore.h" +#include "bmap.h" +#include "glock.h" +#include "log.h" +#include "lops.h" +#include "meta_io.h" +#include "util.h" +#include "dir.h" +#include "trace_gfs2.h" +#include "trans.h" + +static void gfs2_log_shutdown(struct gfs2_sbd *sdp); + +/** + * gfs2_struct2blk - compute stuff + * @sdp: the filesystem + * @nstruct: the number of structures + * + * Compute the number of log descriptor blocks needed to hold a certain number + * of structures of a certain size. + * + * Returns: the number of blocks needed (minimum is always 1) + */ + +unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct) +{ + unsigned int blks; + unsigned int first, second; + + /* The initial struct gfs2_log_descriptor block */ + blks = 1; + first = sdp->sd_ldptrs; + + if (nstruct > first) { + /* Subsequent struct gfs2_meta_header blocks */ + second = sdp->sd_inptrs; + blks += DIV_ROUND_UP(nstruct - first, second); + } + + return blks; +} + +/** + * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters + * @bd: The gfs2_bufdata to remove + * + * The ail lock _must_ be held when calling this function + * + */ + +void gfs2_remove_from_ail(struct gfs2_bufdata *bd) +{ + bd->bd_tr = NULL; + list_del_init(&bd->bd_ail_st_list); + list_del_init(&bd->bd_ail_gl_list); + atomic_dec(&bd->bd_gl->gl_ail_count); + brelse(bd->bd_bh); +} + +static int __gfs2_writepage(struct folio *folio, struct writeback_control *wbc, + void *data) +{ + struct address_space *mapping = data; + int ret = mapping->a_ops->writepage(&folio->page, wbc); + mapping_set_error(mapping, ret); + return ret; +} + +/** + * gfs2_ail1_start_one - Start I/O on a transaction + * @sdp: The superblock + * @wbc: The writeback control structure + * @tr: The transaction to start I/O on + * @plug: The block plug currently active + */ + +static int gfs2_ail1_start_one(struct gfs2_sbd *sdp, + struct writeback_control *wbc, + struct gfs2_trans *tr, struct blk_plug *plug) +__releases(&sdp->sd_ail_lock) +__acquires(&sdp->sd_ail_lock) +{ + struct gfs2_glock *gl = NULL; + struct address_space *mapping; + struct gfs2_bufdata *bd, *s; + struct buffer_head *bh; + int ret = 0; + + list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, bd_ail_st_list) { + bh = bd->bd_bh; + + gfs2_assert(sdp, bd->bd_tr == tr); + + if (!buffer_busy(bh)) { + if (buffer_uptodate(bh)) { + list_move(&bd->bd_ail_st_list, + &tr->tr_ail2_list); + continue; + } + if (!cmpxchg(&sdp->sd_log_error, 0, -EIO)) { + gfs2_io_error_bh(sdp, bh); + gfs2_withdraw_delayed(sdp); + } + } + + if (gfs2_withdrawn(sdp)) { + gfs2_remove_from_ail(bd); + continue; + } + if (!buffer_dirty(bh)) + continue; + if (gl == bd->bd_gl) + continue; + gl = bd->bd_gl; + list_move(&bd->bd_ail_st_list, &tr->tr_ail1_list); + mapping = bh->b_folio->mapping; + if (!mapping) + continue; + spin_unlock(&sdp->sd_ail_lock); + ret = write_cache_pages(mapping, wbc, __gfs2_writepage, mapping); + if (need_resched()) { + blk_finish_plug(plug); + cond_resched(); + blk_start_plug(plug); + } + spin_lock(&sdp->sd_ail_lock); + if (ret == -ENODATA) /* if a jdata write into a new hole */ + ret = 0; /* ignore it */ + if (ret || wbc->nr_to_write <= 0) + break; + return -EBUSY; + } + + return ret; +} + +static void dump_ail_list(struct gfs2_sbd *sdp) +{ + struct gfs2_trans *tr; + struct gfs2_bufdata *bd; + struct buffer_head *bh; + + list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { + list_for_each_entry_reverse(bd, &tr->tr_ail1_list, + bd_ail_st_list) { + bh = bd->bd_bh; + fs_err(sdp, "bd %p: blk:0x%llx bh=%p ", bd, + (unsigned long long)bd->bd_blkno, bh); + if (!bh) { + fs_err(sdp, "\n"); + continue; + } + fs_err(sdp, "0x%llx up2:%d dirt:%d lkd:%d req:%d " + "map:%d new:%d ar:%d aw:%d delay:%d " + "io err:%d unwritten:%d dfr:%d pin:%d esc:%d\n", + (unsigned long long)bh->b_blocknr, + buffer_uptodate(bh), buffer_dirty(bh), + buffer_locked(bh), buffer_req(bh), + buffer_mapped(bh), buffer_new(bh), + buffer_async_read(bh), buffer_async_write(bh), + buffer_delay(bh), buffer_write_io_error(bh), + buffer_unwritten(bh), + buffer_defer_completion(bh), + buffer_pinned(bh), buffer_escaped(bh)); + } + } +} + +/** + * gfs2_ail1_flush - start writeback of some ail1 entries + * @sdp: The super block + * @wbc: The writeback control structure + * + * Writes back some ail1 entries, according to the limits in the + * writeback control structure + */ + +void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc) +{ + struct list_head *head = &sdp->sd_ail1_list; + struct gfs2_trans *tr; + struct blk_plug plug; + int ret; + unsigned long flush_start = jiffies; + + trace_gfs2_ail_flush(sdp, wbc, 1); + blk_start_plug(&plug); + spin_lock(&sdp->sd_ail_lock); +restart: + ret = 0; + if (time_after(jiffies, flush_start + (HZ * 600))) { + fs_err(sdp, "Error: In %s for ten minutes! t=%d\n", + __func__, current->journal_info ? 1 : 0); + dump_ail_list(sdp); + goto out; + } + list_for_each_entry_reverse(tr, head, tr_list) { + if (wbc->nr_to_write <= 0) + break; + ret = gfs2_ail1_start_one(sdp, wbc, tr, &plug); + if (ret) { + if (ret == -EBUSY) + goto restart; + break; + } + } +out: + spin_unlock(&sdp->sd_ail_lock); + blk_finish_plug(&plug); + if (ret) { + gfs2_lm(sdp, "gfs2_ail1_start_one returned: %d\n", ret); + gfs2_withdraw(sdp); + } + trace_gfs2_ail_flush(sdp, wbc, 0); +} + +/** + * gfs2_ail1_start - start writeback of all ail1 entries + * @sdp: The superblock + */ + +static void gfs2_ail1_start(struct gfs2_sbd *sdp) +{ + struct writeback_control wbc = { + .sync_mode = WB_SYNC_NONE, + .nr_to_write = LONG_MAX, + .range_start = 0, + .range_end = LLONG_MAX, + }; + + return gfs2_ail1_flush(sdp, &wbc); +} + +static void gfs2_log_update_flush_tail(struct gfs2_sbd *sdp) +{ + unsigned int new_flush_tail = sdp->sd_log_head; + struct gfs2_trans *tr; + + if (!list_empty(&sdp->sd_ail1_list)) { + tr = list_last_entry(&sdp->sd_ail1_list, + struct gfs2_trans, tr_list); + new_flush_tail = tr->tr_first; + } + sdp->sd_log_flush_tail = new_flush_tail; +} + +static void gfs2_log_update_head(struct gfs2_sbd *sdp) +{ + unsigned int new_head = sdp->sd_log_flush_head; + + if (sdp->sd_log_flush_tail == sdp->sd_log_head) + sdp->sd_log_flush_tail = new_head; + sdp->sd_log_head = new_head; +} + +/* + * gfs2_ail_empty_tr - empty one of the ail lists of a transaction + */ + +static void gfs2_ail_empty_tr(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + struct list_head *head) +{ + struct gfs2_bufdata *bd; + + while (!list_empty(head)) { + bd = list_first_entry(head, struct gfs2_bufdata, + bd_ail_st_list); + gfs2_assert(sdp, bd->bd_tr == tr); + gfs2_remove_from_ail(bd); + } +} + +/** + * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced + * @sdp: the filesystem + * @tr: the transaction + * @max_revokes: If nonzero, issue revokes for the bd items for written buffers + * + * returns: the transaction's count of remaining active items + */ + +static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + int *max_revokes) +{ + struct gfs2_bufdata *bd, *s; + struct buffer_head *bh; + int active_count = 0; + + list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, + bd_ail_st_list) { + bh = bd->bd_bh; + gfs2_assert(sdp, bd->bd_tr == tr); + /* + * If another process flagged an io error, e.g. writing to the + * journal, error all other bhs and move them off the ail1 to + * prevent a tight loop when unmount tries to flush ail1, + * regardless of whether they're still busy. If no outside + * errors were found and the buffer is busy, move to the next. + * If the ail buffer is not busy and caught an error, flag it + * for others. + */ + if (!sdp->sd_log_error && buffer_busy(bh)) { + active_count++; + continue; + } + if (!buffer_uptodate(bh) && + !cmpxchg(&sdp->sd_log_error, 0, -EIO)) { + gfs2_io_error_bh(sdp, bh); + gfs2_withdraw_delayed(sdp); + } + /* + * If we have space for revokes and the bd is no longer on any + * buf list, we can just add a revoke for it immediately and + * avoid having to put it on the ail2 list, where it would need + * to be revoked later. + */ + if (*max_revokes && list_empty(&bd->bd_list)) { + gfs2_add_revoke(sdp, bd); + (*max_revokes)--; + continue; + } + list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list); + } + return active_count; +} + +/** + * gfs2_ail1_empty - Try to empty the ail1 lists + * @sdp: The superblock + * @max_revokes: If non-zero, add revokes where appropriate + * + * Tries to empty the ail1 lists, starting with the oldest first + */ + +static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int max_revokes) +{ + struct gfs2_trans *tr, *s; + int oldest_tr = 1; + int ret; + + spin_lock(&sdp->sd_ail_lock); + list_for_each_entry_safe_reverse(tr, s, &sdp->sd_ail1_list, tr_list) { + if (!gfs2_ail1_empty_one(sdp, tr, &max_revokes) && oldest_tr) + list_move(&tr->tr_list, &sdp->sd_ail2_list); + else + oldest_tr = 0; + } + gfs2_log_update_flush_tail(sdp); + ret = list_empty(&sdp->sd_ail1_list); + spin_unlock(&sdp->sd_ail_lock); + + if (test_bit(SDF_WITHDRAWING, &sdp->sd_flags)) { + gfs2_lm(sdp, "fatal: I/O error(s)\n"); + gfs2_withdraw(sdp); + } + + return ret; +} + +static void gfs2_ail1_wait(struct gfs2_sbd *sdp) +{ + struct gfs2_trans *tr; + struct gfs2_bufdata *bd; + struct buffer_head *bh; + + spin_lock(&sdp->sd_ail_lock); + list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) { + list_for_each_entry(bd, &tr->tr_ail1_list, bd_ail_st_list) { + bh = bd->bd_bh; + if (!buffer_locked(bh)) + continue; + get_bh(bh); + spin_unlock(&sdp->sd_ail_lock); + wait_on_buffer(bh); + brelse(bh); + return; + } + } + spin_unlock(&sdp->sd_ail_lock); +} + +static void __ail2_empty(struct gfs2_sbd *sdp, struct gfs2_trans *tr) +{ + gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list); + list_del(&tr->tr_list); + gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); + gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list)); + gfs2_trans_free(sdp, tr); +} + +static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) +{ + struct list_head *ail2_list = &sdp->sd_ail2_list; + unsigned int old_tail = sdp->sd_log_tail; + struct gfs2_trans *tr, *safe; + + spin_lock(&sdp->sd_ail_lock); + if (old_tail <= new_tail) { + list_for_each_entry_safe(tr, safe, ail2_list, tr_list) { + if (old_tail <= tr->tr_first && tr->tr_first < new_tail) + __ail2_empty(sdp, tr); + } + } else { + list_for_each_entry_safe(tr, safe, ail2_list, tr_list) { + if (old_tail <= tr->tr_first || tr->tr_first < new_tail) + __ail2_empty(sdp, tr); + } + } + spin_unlock(&sdp->sd_ail_lock); +} + +/** + * gfs2_log_is_empty - Check if the log is empty + * @sdp: The GFS2 superblock + */ + +bool gfs2_log_is_empty(struct gfs2_sbd *sdp) { + return atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks; +} + +static bool __gfs2_log_try_reserve_revokes(struct gfs2_sbd *sdp, unsigned int revokes) +{ + unsigned int available; + + available = atomic_read(&sdp->sd_log_revokes_available); + while (available >= revokes) { + if (atomic_try_cmpxchg(&sdp->sd_log_revokes_available, + &available, available - revokes)) + return true; + } + return false; +} + +/** + * gfs2_log_release_revokes - Release a given number of revokes + * @sdp: The GFS2 superblock + * @revokes: The number of revokes to release + * + * sdp->sd_log_flush_lock must be held. + */ +void gfs2_log_release_revokes(struct gfs2_sbd *sdp, unsigned int revokes) +{ + if (revokes) + atomic_add(revokes, &sdp->sd_log_revokes_available); +} + +/** + * gfs2_log_release - Release a given number of log blocks + * @sdp: The GFS2 superblock + * @blks: The number of blocks + * + */ + +void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) +{ + atomic_add(blks, &sdp->sd_log_blks_free); + trace_gfs2_log_blocks(sdp, blks); + gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= + sdp->sd_jdesc->jd_blocks); + if (atomic_read(&sdp->sd_log_blks_needed)) + wake_up(&sdp->sd_log_waitq); +} + +/** + * __gfs2_log_try_reserve - Try to make a log reservation + * @sdp: The GFS2 superblock + * @blks: The number of blocks to reserve + * @taboo_blks: The number of blocks to leave free + * + * Try to do the same as __gfs2_log_reserve(), but fail if no more log + * space is immediately available. + */ +static bool __gfs2_log_try_reserve(struct gfs2_sbd *sdp, unsigned int blks, + unsigned int taboo_blks) +{ + unsigned wanted = blks + taboo_blks; + unsigned int free_blocks; + + free_blocks = atomic_read(&sdp->sd_log_blks_free); + while (free_blocks >= wanted) { + if (atomic_try_cmpxchg(&sdp->sd_log_blks_free, &free_blocks, + free_blocks - blks)) { + trace_gfs2_log_blocks(sdp, -blks); + return true; + } + } + return false; +} + +/** + * __gfs2_log_reserve - Make a log reservation + * @sdp: The GFS2 superblock + * @blks: The number of blocks to reserve + * @taboo_blks: The number of blocks to leave free + * + * @taboo_blks is set to 0 for logd, and to GFS2_LOG_FLUSH_MIN_BLOCKS + * for all other processes. This ensures that when the log is almost full, + * logd will still be able to call gfs2_log_flush one more time without + * blocking, which will advance the tail and make some more log space + * available. + * + * We no longer flush the log here, instead we wake up logd to do that + * for us. To avoid the thundering herd and to ensure that we deal fairly + * with queued waiters, we use an exclusive wait. This means that when we + * get woken with enough journal space to get our reservation, we need to + * wake the next waiter on the list. + */ + +static void __gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks, + unsigned int taboo_blks) +{ + unsigned wanted = blks + taboo_blks; + unsigned int free_blocks; + + atomic_add(blks, &sdp->sd_log_blks_needed); + for (;;) { + if (current != sdp->sd_logd_process) + wake_up(&sdp->sd_logd_waitq); + io_wait_event(sdp->sd_log_waitq, + (free_blocks = atomic_read(&sdp->sd_log_blks_free), + free_blocks >= wanted)); + do { + if (atomic_try_cmpxchg(&sdp->sd_log_blks_free, + &free_blocks, + free_blocks - blks)) + goto reserved; + } while (free_blocks >= wanted); + } + +reserved: + trace_gfs2_log_blocks(sdp, -blks); + if (atomic_sub_return(blks, &sdp->sd_log_blks_needed)) + wake_up(&sdp->sd_log_waitq); +} + +/** + * gfs2_log_try_reserve - Try to make a log reservation + * @sdp: The GFS2 superblock + * @tr: The transaction + * @extra_revokes: The number of additional revokes reserved (output) + * + * This is similar to gfs2_log_reserve, but sdp->sd_log_flush_lock must be + * held for correct revoke accounting. + */ + +bool gfs2_log_try_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + unsigned int *extra_revokes) +{ + unsigned int blks = tr->tr_reserved; + unsigned int revokes = tr->tr_revokes; + unsigned int revoke_blks = 0; + + *extra_revokes = 0; + if (revokes && !__gfs2_log_try_reserve_revokes(sdp, revokes)) { + revoke_blks = DIV_ROUND_UP(revokes, sdp->sd_inptrs); + *extra_revokes = revoke_blks * sdp->sd_inptrs - revokes; + blks += revoke_blks; + } + if (!blks) + return true; + if (__gfs2_log_try_reserve(sdp, blks, GFS2_LOG_FLUSH_MIN_BLOCKS)) + return true; + if (!revoke_blks) + gfs2_log_release_revokes(sdp, revokes); + return false; +} + +/** + * gfs2_log_reserve - Make a log reservation + * @sdp: The GFS2 superblock + * @tr: The transaction + * @extra_revokes: The number of additional revokes reserved (output) + * + * sdp->sd_log_flush_lock must not be held. + */ + +void gfs2_log_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + unsigned int *extra_revokes) +{ + unsigned int blks = tr->tr_reserved; + unsigned int revokes = tr->tr_revokes; + unsigned int revoke_blks; + + *extra_revokes = 0; + if (revokes) { + revoke_blks = DIV_ROUND_UP(revokes, sdp->sd_inptrs); + *extra_revokes = revoke_blks * sdp->sd_inptrs - revokes; + blks += revoke_blks; + } + __gfs2_log_reserve(sdp, blks, GFS2_LOG_FLUSH_MIN_BLOCKS); +} + +/** + * log_distance - Compute distance between two journal blocks + * @sdp: The GFS2 superblock + * @newer: The most recent journal block of the pair + * @older: The older journal block of the pair + * + * Compute the distance (in the journal direction) between two + * blocks in the journal + * + * Returns: the distance in blocks + */ + +static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, + unsigned int older) +{ + int dist; + + dist = newer - older; + if (dist < 0) + dist += sdp->sd_jdesc->jd_blocks; + + return dist; +} + +/** + * calc_reserved - Calculate the number of blocks to keep reserved + * @sdp: The GFS2 superblock + * + * This is complex. We need to reserve room for all our currently used + * metadata blocks (e.g. normal file I/O rewriting file time stamps) and + * all our journaled data blocks for journaled files (e.g. files in the + * meta_fs like rindex, or files for which chattr +j was done.) + * If we don't reserve enough space, corruption will follow. + * + * We can have metadata blocks and jdata blocks in the same journal. Each + * type gets its own log descriptor, for which we need to reserve a block. + * In fact, each type has the potential for needing more than one log descriptor + * in cases where we have more blocks than will fit in a log descriptor. + * Metadata journal entries take up half the space of journaled buffer entries. + * + * Also, we need to reserve blocks for revoke journal entries and one for an + * overall header for the lot. + * + * Returns: the number of blocks reserved + */ +static unsigned int calc_reserved(struct gfs2_sbd *sdp) +{ + unsigned int reserved = GFS2_LOG_FLUSH_MIN_BLOCKS; + unsigned int blocks; + struct gfs2_trans *tr = sdp->sd_log_tr; + + if (tr) { + blocks = tr->tr_num_buf_new - tr->tr_num_buf_rm; + reserved += blocks + DIV_ROUND_UP(blocks, buf_limit(sdp)); + blocks = tr->tr_num_databuf_new - tr->tr_num_databuf_rm; + reserved += blocks + DIV_ROUND_UP(blocks, databuf_limit(sdp)); + } + return reserved; +} + +static void log_pull_tail(struct gfs2_sbd *sdp) +{ + unsigned int new_tail = sdp->sd_log_flush_tail; + unsigned int dist; + + if (new_tail == sdp->sd_log_tail) + return; + dist = log_distance(sdp, new_tail, sdp->sd_log_tail); + ail2_empty(sdp, new_tail); + gfs2_log_release(sdp, dist); + sdp->sd_log_tail = new_tail; +} + + +void log_flush_wait(struct gfs2_sbd *sdp) +{ + DEFINE_WAIT(wait); + + if (atomic_read(&sdp->sd_log_in_flight)) { + do { + prepare_to_wait(&sdp->sd_log_flush_wait, &wait, + TASK_UNINTERRUPTIBLE); + if (atomic_read(&sdp->sd_log_in_flight)) + io_schedule(); + } while(atomic_read(&sdp->sd_log_in_flight)); + finish_wait(&sdp->sd_log_flush_wait, &wait); + } +} + +static int ip_cmp(void *priv, const struct list_head *a, const struct list_head *b) +{ + struct gfs2_inode *ipa, *ipb; + + ipa = list_entry(a, struct gfs2_inode, i_ordered); + ipb = list_entry(b, struct gfs2_inode, i_ordered); + + if (ipa->i_no_addr < ipb->i_no_addr) + return -1; + if (ipa->i_no_addr > ipb->i_no_addr) + return 1; + return 0; +} + +static void __ordered_del_inode(struct gfs2_inode *ip) +{ + if (!list_empty(&ip->i_ordered)) + list_del_init(&ip->i_ordered); +} + +static void gfs2_ordered_write(struct gfs2_sbd *sdp) +{ + struct gfs2_inode *ip; + LIST_HEAD(written); + + spin_lock(&sdp->sd_ordered_lock); + list_sort(NULL, &sdp->sd_log_ordered, &ip_cmp); + while (!list_empty(&sdp->sd_log_ordered)) { + ip = list_first_entry(&sdp->sd_log_ordered, struct gfs2_inode, i_ordered); + if (ip->i_inode.i_mapping->nrpages == 0) { + __ordered_del_inode(ip); + continue; + } + list_move(&ip->i_ordered, &written); + spin_unlock(&sdp->sd_ordered_lock); + filemap_fdatawrite(ip->i_inode.i_mapping); + spin_lock(&sdp->sd_ordered_lock); + } + list_splice(&written, &sdp->sd_log_ordered); + spin_unlock(&sdp->sd_ordered_lock); +} + +static void gfs2_ordered_wait(struct gfs2_sbd *sdp) +{ + struct gfs2_inode *ip; + + spin_lock(&sdp->sd_ordered_lock); + while (!list_empty(&sdp->sd_log_ordered)) { + ip = list_first_entry(&sdp->sd_log_ordered, struct gfs2_inode, i_ordered); + __ordered_del_inode(ip); + if (ip->i_inode.i_mapping->nrpages == 0) + continue; + spin_unlock(&sdp->sd_ordered_lock); + filemap_fdatawait(ip->i_inode.i_mapping); + spin_lock(&sdp->sd_ordered_lock); + } + spin_unlock(&sdp->sd_ordered_lock); +} + +void gfs2_ordered_del_inode(struct gfs2_inode *ip) +{ + struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); + + spin_lock(&sdp->sd_ordered_lock); + __ordered_del_inode(ip); + spin_unlock(&sdp->sd_ordered_lock); +} + +void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) +{ + struct buffer_head *bh = bd->bd_bh; + struct gfs2_glock *gl = bd->bd_gl; + + sdp->sd_log_num_revoke++; + if (atomic_inc_return(&gl->gl_revokes) == 1) + gfs2_glock_hold(gl); + bh->b_private = NULL; + bd->bd_blkno = bh->b_blocknr; + gfs2_remove_from_ail(bd); /* drops ref on bh */ + bd->bd_bh = NULL; + set_bit(GLF_LFLUSH, &gl->gl_flags); + list_add(&bd->bd_list, &sdp->sd_log_revokes); +} + +void gfs2_glock_remove_revoke(struct gfs2_glock *gl) +{ + if (atomic_dec_return(&gl->gl_revokes) == 0) { + clear_bit(GLF_LFLUSH, &gl->gl_flags); + gfs2_glock_queue_put(gl); + } +} + +/** + * gfs2_flush_revokes - Add as many revokes to the system transaction as we can + * @sdp: The GFS2 superblock + * + * Our usual strategy is to defer writing revokes as much as we can in the hope + * that we'll eventually overwrite the journal, which will make those revokes + * go away. This changes when we flush the log: at that point, there will + * likely be some left-over space in the last revoke block of that transaction. + * We can fill that space with additional revokes for blocks that have already + * been written back. This will basically come at no cost now, and will save + * us from having to keep track of those blocks on the AIL2 list later. + */ +void gfs2_flush_revokes(struct gfs2_sbd *sdp) +{ + /* number of revokes we still have room for */ + unsigned int max_revokes = atomic_read(&sdp->sd_log_revokes_available); + + gfs2_log_lock(sdp); + gfs2_ail1_empty(sdp, max_revokes); + gfs2_log_unlock(sdp); +} + +/** + * gfs2_write_log_header - Write a journal log header buffer at lblock + * @sdp: The GFS2 superblock + * @jd: journal descriptor of the journal to which we are writing + * @seq: sequence number + * @tail: tail of the log + * @lblock: value for lh_blkno (block number relative to start of journal) + * @flags: log header flags GFS2_LOG_HEAD_* + * @op_flags: flags to pass to the bio + * + * Returns: the initialized log buffer descriptor + */ + +void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, + u64 seq, u32 tail, u32 lblock, u32 flags, + blk_opf_t op_flags) +{ + struct gfs2_log_header *lh; + u32 hash, crc; + struct page *page; + struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; + struct timespec64 tv; + struct super_block *sb = sdp->sd_vfs; + u64 dblock; + + if (gfs2_withdrawn(sdp)) + return; + + page = mempool_alloc(gfs2_page_pool, GFP_NOIO); + lh = page_address(page); + clear_page(lh); + + lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); + lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); + lh->lh_header.__pad0 = cpu_to_be64(0); + lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); + lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); + lh->lh_sequence = cpu_to_be64(seq); + lh->lh_flags = cpu_to_be32(flags); + lh->lh_tail = cpu_to_be32(tail); + lh->lh_blkno = cpu_to_be32(lblock); + hash = ~crc32(~0, lh, LH_V1_SIZE); + lh->lh_hash = cpu_to_be32(hash); + + ktime_get_coarse_real_ts64(&tv); + lh->lh_nsec = cpu_to_be32(tv.tv_nsec); + lh->lh_sec = cpu_to_be64(tv.tv_sec); + if (!list_empty(&jd->extent_list)) + dblock = gfs2_log_bmap(jd, lblock); + else { + unsigned int extlen; + int ret; + + extlen = 1; + ret = gfs2_get_extent(jd->jd_inode, lblock, &dblock, &extlen); + if (gfs2_assert_withdraw(sdp, ret == 0)) + return; + } + lh->lh_addr = cpu_to_be64(dblock); + lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr); + + /* We may only write local statfs, quota, etc., when writing to our + own journal. The values are left 0 when recovering a journal + different from our own. */ + if (!(flags & GFS2_LOG_HEAD_RECOVERY)) { + lh->lh_statfs_addr = + cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr); + lh->lh_quota_addr = + cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr); + + spin_lock(&sdp->sd_statfs_spin); + lh->lh_local_total = cpu_to_be64(l_sc->sc_total); + lh->lh_local_free = cpu_to_be64(l_sc->sc_free); + lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes); + spin_unlock(&sdp->sd_statfs_spin); + } + + BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE); + + crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4, + sb->s_blocksize - LH_V1_SIZE - 4); + lh->lh_crc = cpu_to_be32(crc); + + gfs2_log_write(sdp, jd, page, sb->s_blocksize, 0, dblock); + gfs2_log_submit_bio(&jd->jd_log_bio, REQ_OP_WRITE | op_flags); +} + +/** + * log_write_header - Get and initialize a journal header buffer + * @sdp: The GFS2 superblock + * @flags: The log header flags, including log header origin + * + * Returns: the initialized log buffer descriptor + */ + +static void log_write_header(struct gfs2_sbd *sdp, u32 flags) +{ + blk_opf_t op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC; + + gfs2_assert_withdraw(sdp, !test_bit(SDF_FROZEN, &sdp->sd_flags)); + + if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) { + gfs2_ordered_wait(sdp); + log_flush_wait(sdp); + op_flags = REQ_SYNC | REQ_META | REQ_PRIO; + } + sdp->sd_log_idle = (sdp->sd_log_flush_tail == sdp->sd_log_flush_head); + gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, + sdp->sd_log_flush_tail, sdp->sd_log_flush_head, + flags, op_flags); + gfs2_log_incr_head(sdp); + log_flush_wait(sdp); + log_pull_tail(sdp); + gfs2_log_update_head(sdp); +} + +/** + * gfs2_ail_drain - drain the ail lists after a withdraw + * @sdp: Pointer to GFS2 superblock + */ +void gfs2_ail_drain(struct gfs2_sbd *sdp) +{ + struct gfs2_trans *tr; + + spin_lock(&sdp->sd_ail_lock); + /* + * For transactions on the sd_ail1_list we need to drain both the + * ail1 and ail2 lists. That's because function gfs2_ail1_start_one + * (temporarily) moves items from its tr_ail1 list to tr_ail2 list + * before revokes are sent for that block. Items on the sd_ail2_list + * should have already gotten beyond that point, so no need. + */ + while (!list_empty(&sdp->sd_ail1_list)) { + tr = list_first_entry(&sdp->sd_ail1_list, struct gfs2_trans, + tr_list); + gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail1_list); + gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list); + list_del(&tr->tr_list); + gfs2_trans_free(sdp, tr); + } + while (!list_empty(&sdp->sd_ail2_list)) { + tr = list_first_entry(&sdp->sd_ail2_list, struct gfs2_trans, + tr_list); + gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list); + list_del(&tr->tr_list); + gfs2_trans_free(sdp, tr); + } + gfs2_drain_revokes(sdp); + spin_unlock(&sdp->sd_ail_lock); +} + +/** + * empty_ail1_list - try to start IO and empty the ail1 list + * @sdp: Pointer to GFS2 superblock + */ +static void empty_ail1_list(struct gfs2_sbd *sdp) +{ + unsigned long start = jiffies; + + for (;;) { + if (time_after(jiffies, start + (HZ * 600))) { + fs_err(sdp, "Error: In %s for 10 minutes! t=%d\n", + __func__, current->journal_info ? 1 : 0); + dump_ail_list(sdp); + return; + } + gfs2_ail1_start(sdp); + gfs2_ail1_wait(sdp); + if (gfs2_ail1_empty(sdp, 0)) + return; + } +} + +/** + * trans_drain - drain the buf and databuf queue for a failed transaction + * @tr: the transaction to drain + * + * When this is called, we're taking an error exit for a log write that failed + * but since we bypassed the after_commit functions, we need to remove the + * items from the buf and databuf queue. + */ +static void trans_drain(struct gfs2_trans *tr) +{ + struct gfs2_bufdata *bd; + struct list_head *head; + + if (!tr) + return; + + head = &tr->tr_buf; + while (!list_empty(head)) { + bd = list_first_entry(head, struct gfs2_bufdata, bd_list); + list_del_init(&bd->bd_list); + if (!list_empty(&bd->bd_ail_st_list)) + gfs2_remove_from_ail(bd); + kmem_cache_free(gfs2_bufdata_cachep, bd); + } + head = &tr->tr_databuf; + while (!list_empty(head)) { + bd = list_first_entry(head, struct gfs2_bufdata, bd_list); + list_del_init(&bd->bd_list); + if (!list_empty(&bd->bd_ail_st_list)) + gfs2_remove_from_ail(bd); + kmem_cache_free(gfs2_bufdata_cachep, bd); + } +} + +/** + * gfs2_log_flush - flush incore transaction(s) + * @sdp: The filesystem + * @gl: The glock structure to flush. If NULL, flush the whole incore log + * @flags: The log header flags: GFS2_LOG_HEAD_FLUSH_* and debug flags + * + */ + +void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags) +{ + struct gfs2_trans *tr = NULL; + unsigned int reserved_blocks = 0, used_blocks = 0; + bool frozen = test_bit(SDF_FROZEN, &sdp->sd_flags); + unsigned int first_log_head; + unsigned int reserved_revokes = 0; + + down_write(&sdp->sd_log_flush_lock); + trace_gfs2_log_flush(sdp, 1, flags); + +repeat: + /* + * Do this check while holding the log_flush_lock to prevent new + * buffers from being added to the ail via gfs2_pin() + */ + if (gfs2_withdrawn(sdp) || !test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) + goto out; + + /* Log might have been flushed while we waited for the flush lock */ + if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) + goto out; + + first_log_head = sdp->sd_log_head; + sdp->sd_log_flush_head = first_log_head; + + tr = sdp->sd_log_tr; + if (tr || sdp->sd_log_num_revoke) { + if (reserved_blocks) + gfs2_log_release(sdp, reserved_blocks); + reserved_blocks = sdp->sd_log_blks_reserved; + reserved_revokes = sdp->sd_log_num_revoke; + if (tr) { + sdp->sd_log_tr = NULL; + tr->tr_first = first_log_head; + if (unlikely(frozen)) { + if (gfs2_assert_withdraw_delayed(sdp, + !tr->tr_num_buf_new && !tr->tr_num_databuf_new)) + goto out_withdraw; + } + } + } else if (!reserved_blocks) { + unsigned int taboo_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS; + + reserved_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS; + if (current == sdp->sd_logd_process) + taboo_blocks = 0; + + if (!__gfs2_log_try_reserve(sdp, reserved_blocks, taboo_blocks)) { + up_write(&sdp->sd_log_flush_lock); + __gfs2_log_reserve(sdp, reserved_blocks, taboo_blocks); + down_write(&sdp->sd_log_flush_lock); + goto repeat; + } + BUG_ON(sdp->sd_log_num_revoke); + } + + if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN) + clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); + + if (unlikely(frozen)) + if (gfs2_assert_withdraw_delayed(sdp, !reserved_revokes)) + goto out_withdraw; + + gfs2_ordered_write(sdp); + if (gfs2_withdrawn(sdp)) + goto out_withdraw; + lops_before_commit(sdp, tr); + if (gfs2_withdrawn(sdp)) + goto out_withdraw; + gfs2_log_submit_bio(&sdp->sd_jdesc->jd_log_bio, REQ_OP_WRITE); + if (gfs2_withdrawn(sdp)) + goto out_withdraw; + + if (sdp->sd_log_head != sdp->sd_log_flush_head) { + log_write_header(sdp, flags); + } else if (sdp->sd_log_tail != sdp->sd_log_flush_tail && !sdp->sd_log_idle) { + log_write_header(sdp, flags); + } + if (gfs2_withdrawn(sdp)) + goto out_withdraw; + lops_after_commit(sdp, tr); + + gfs2_log_lock(sdp); + sdp->sd_log_blks_reserved = 0; + + spin_lock(&sdp->sd_ail_lock); + if (tr && !list_empty(&tr->tr_ail1_list)) { + list_add(&tr->tr_list, &sdp->sd_ail1_list); + tr = NULL; + } + spin_unlock(&sdp->sd_ail_lock); + gfs2_log_unlock(sdp); + + if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) { + if (!sdp->sd_log_idle) { + empty_ail1_list(sdp); + if (gfs2_withdrawn(sdp)) + goto out_withdraw; + log_write_header(sdp, flags); + } + if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN | + GFS2_LOG_HEAD_FLUSH_FREEZE)) + gfs2_log_shutdown(sdp); + } + +out_end: + used_blocks = log_distance(sdp, sdp->sd_log_flush_head, first_log_head); + reserved_revokes += atomic_read(&sdp->sd_log_revokes_available); + atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); + gfs2_assert_withdraw(sdp, reserved_revokes % sdp->sd_inptrs == sdp->sd_ldptrs); + if (reserved_revokes > sdp->sd_ldptrs) + reserved_blocks += (reserved_revokes - sdp->sd_ldptrs) / sdp->sd_inptrs; +out: + if (used_blocks != reserved_blocks) { + gfs2_assert_withdraw_delayed(sdp, used_blocks < reserved_blocks); + gfs2_log_release(sdp, reserved_blocks - used_blocks); + } + up_write(&sdp->sd_log_flush_lock); + gfs2_trans_free(sdp, tr); + if (gfs2_withdrawing(sdp)) + gfs2_withdraw(sdp); + trace_gfs2_log_flush(sdp, 0, flags); + return; + +out_withdraw: + trans_drain(tr); + /** + * If the tr_list is empty, we're withdrawing during a log + * flush that targets a transaction, but the transaction was + * never queued onto any of the ail lists. Here we add it to + * ail1 just so that ail_drain() will find and free it. + */ + spin_lock(&sdp->sd_ail_lock); + if (tr && list_empty(&tr->tr_list)) + list_add(&tr->tr_list, &sdp->sd_ail1_list); + spin_unlock(&sdp->sd_ail_lock); + tr = NULL; + goto out_end; +} + +/** + * gfs2_merge_trans - Merge a new transaction into a cached transaction + * @sdp: the filesystem + * @new: New transaction to be merged + */ + +static void gfs2_merge_trans(struct gfs2_sbd *sdp, struct gfs2_trans *new) +{ + struct gfs2_trans *old = sdp->sd_log_tr; + + WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags)); + + old->tr_num_buf_new += new->tr_num_buf_new; + old->tr_num_databuf_new += new->tr_num_databuf_new; + old->tr_num_buf_rm += new->tr_num_buf_rm; + old->tr_num_databuf_rm += new->tr_num_databuf_rm; + old->tr_revokes += new->tr_revokes; + old->tr_num_revoke += new->tr_num_revoke; + + list_splice_tail_init(&new->tr_databuf, &old->tr_databuf); + list_splice_tail_init(&new->tr_buf, &old->tr_buf); + + spin_lock(&sdp->sd_ail_lock); + list_splice_tail_init(&new->tr_ail1_list, &old->tr_ail1_list); + list_splice_tail_init(&new->tr_ail2_list, &old->tr_ail2_list); + spin_unlock(&sdp->sd_ail_lock); +} + +static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) +{ + unsigned int reserved; + unsigned int unused; + unsigned int maxres; + + gfs2_log_lock(sdp); + + if (sdp->sd_log_tr) { + gfs2_merge_trans(sdp, tr); + } else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) { + gfs2_assert_withdraw(sdp, !test_bit(TR_ONSTACK, &tr->tr_flags)); + sdp->sd_log_tr = tr; + set_bit(TR_ATTACHED, &tr->tr_flags); + } + + reserved = calc_reserved(sdp); + maxres = sdp->sd_log_blks_reserved + tr->tr_reserved; + gfs2_assert_withdraw(sdp, maxres >= reserved); + unused = maxres - reserved; + if (unused) + gfs2_log_release(sdp, unused); + sdp->sd_log_blks_reserved = reserved; + + gfs2_log_unlock(sdp); +} + +static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp) +{ + return atomic_read(&sdp->sd_log_pinned) + + atomic_read(&sdp->sd_log_blks_needed) >= + atomic_read(&sdp->sd_log_thresh1); +} + +static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp) +{ + return sdp->sd_jdesc->jd_blocks - + atomic_read(&sdp->sd_log_blks_free) + + atomic_read(&sdp->sd_log_blks_needed) >= + atomic_read(&sdp->sd_log_thresh2); +} + +/** + * gfs2_log_commit - Commit a transaction to the log + * @sdp: the filesystem + * @tr: the transaction + * + * We wake up gfs2_logd if the number of pinned blocks exceed thresh1 + * or the total number of used blocks (pinned blocks plus AIL blocks) + * is greater than thresh2. + * + * At mount time thresh1 is 2/5ths of journal size, thresh2 is 4/5ths of + * journal size. + * + * Returns: errno + */ + +void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) +{ + log_refund(sdp, tr); + + if (gfs2_ail_flush_reqd(sdp) || gfs2_jrnl_flush_reqd(sdp)) + wake_up(&sdp->sd_logd_waitq); +} + +/** + * gfs2_log_shutdown - write a shutdown header into a journal + * @sdp: the filesystem + * + */ + +static void gfs2_log_shutdown(struct gfs2_sbd *sdp) +{ + gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); + gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); + gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); + + log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN); + log_pull_tail(sdp); + + gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); + gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); +} + +/** + * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks + * @data: Pointer to GFS2 superblock + * + * Also, periodically check to make sure that we're using the most recent + * journal index. + */ + +int gfs2_logd(void *data) +{ + struct gfs2_sbd *sdp = data; + unsigned long t = 1; + + while (!kthread_should_stop()) { + if (gfs2_withdrawn(sdp)) + break; + + /* Check for errors writing to the journal */ + if (sdp->sd_log_error) { + gfs2_lm(sdp, + "GFS2: fsid=%s: error %d: " + "withdrawing the file system to " + "prevent further damage.\n", + sdp->sd_fsname, sdp->sd_log_error); + gfs2_withdraw(sdp); + break; + } + + if (gfs2_jrnl_flush_reqd(sdp) || t == 0) { + gfs2_ail1_empty(sdp, 0); + gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | + GFS2_LFC_LOGD_JFLUSH_REQD); + } + + if (test_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags) || + gfs2_ail_flush_reqd(sdp)) { + clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); + gfs2_ail1_start(sdp); + gfs2_ail1_wait(sdp); + gfs2_ail1_empty(sdp, 0); + gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | + GFS2_LFC_LOGD_AIL_FLUSH_REQD); + } + + t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; + + try_to_freeze(); + + t = wait_event_interruptible_timeout(sdp->sd_logd_waitq, + test_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags) || + gfs2_ail_flush_reqd(sdp) || + gfs2_jrnl_flush_reqd(sdp) || + sdp->sd_log_error || + gfs2_withdrawn(sdp) || + kthread_should_stop(), + t); + } + + return 0; +} + |