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- // 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;
- blks = 1;
- first = sdp->sd_ldptrs;
- if (nstruct > first) {
- 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
- * @mapping: The associated mapping (maybe NULL)
- * @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);
- }
- /**
- * gfs2_ail1_start_one - Start I/O on a part of the AIL
- * @sdp: the filesystem
- * @wbc: The writeback control structure
- * @ai: The ail structure
- *
- */
- static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
- struct writeback_control *wbc,
- struct gfs2_trans *tr)
- __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_page->mapping;
- if (!mapping)
- continue;
- spin_unlock(&sdp->sd_ail_lock);
- ret = generic_writepages(mapping, wbc);
- 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);
- 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 (generic_writepages) "
- "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);
- }
- /**
- * 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;
- }
- 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);
- }
- /**
- * gfs2_ail_empty_tr - empty one of the ail lists for 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);
- }
- }
- static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
- {
- struct gfs2_trans *tr, *safe;
- unsigned int old_tail = sdp->sd_log_tail;
- int wrap = (new_tail < old_tail);
- int a, b, rm;
- spin_lock(&sdp->sd_ail_lock);
- list_for_each_entry_safe(tr, safe, &sdp->sd_ail2_list, tr_list) {
- a = (old_tail <= tr->tr_first);
- b = (tr->tr_first < new_tail);
- rm = (wrap) ? (a || b) : (a && b);
- if (!rm)
- continue;
- 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);
- }
- spin_unlock(&sdp->sd_ail_lock);
- }
- /**
- * 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);
- up_read(&sdp->sd_log_flush_lock);
- }
- /**
- * gfs2_log_reserve - Make a log reservation
- * @sdp: The GFS2 superblock
- * @blks: The number of blocks to reserve
- *
- * Note that we never give out the last few blocks of the journal. Thats
- * due to the fact that there is a small number of header blocks
- * associated with each log flush. The exact number can't be known until
- * flush time, so we ensure that we have just enough free blocks at all
- * times to avoid running out during a log flush.
- *
- * 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.
- *
- * Returns: errno
- */
- int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
- {
- int ret = 0;
- unsigned reserved_blks = 7 * (4096 / sdp->sd_vfs->s_blocksize);
- unsigned wanted = blks + reserved_blks;
- DEFINE_WAIT(wait);
- int did_wait = 0;
- unsigned int free_blocks;
- if (gfs2_assert_warn(sdp, blks) ||
- gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
- return -EINVAL;
- atomic_add(blks, &sdp->sd_log_blks_needed);
- retry:
- free_blocks = atomic_read(&sdp->sd_log_blks_free);
- if (unlikely(free_blocks <= wanted)) {
- do {
- prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
- TASK_UNINTERRUPTIBLE);
- wake_up(&sdp->sd_logd_waitq);
- did_wait = 1;
- if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
- io_schedule();
- free_blocks = atomic_read(&sdp->sd_log_blks_free);
- } while(free_blocks <= wanted);
- finish_wait(&sdp->sd_log_waitq, &wait);
- }
- atomic_inc(&sdp->sd_reserving_log);
- if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
- free_blocks - blks) != free_blocks) {
- if (atomic_dec_and_test(&sdp->sd_reserving_log))
- wake_up(&sdp->sd_reserving_log_wait);
- goto retry;
- }
- atomic_sub(blks, &sdp->sd_log_blks_needed);
- trace_gfs2_log_blocks(sdp, -blks);
- /*
- * If we waited, then so might others, wake them up _after_ we get
- * our share of the log.
- */
- if (unlikely(did_wait))
- wake_up(&sdp->sd_log_waitq);
- down_read(&sdp->sd_log_flush_lock);
- if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
- gfs2_log_release(sdp, blks);
- ret = -EROFS;
- }
- if (atomic_dec_and_test(&sdp->sd_reserving_log))
- wake_up(&sdp->sd_reserving_log_wait);
- return ret;
- }
- /**
- * 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 reserve when
- * refunding a transaction's unused buffers.
- * @sdp: The GFS2 superblock
- *
- * This is complex. We need to reserve room for all our currently used
- * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
- * all our journaled data buffers 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, gfs2_log_refund and gfs2_log_flush
- * will count it as free space (sd_log_blks_free) and corruption will follow.
- *
- * We can have metadata bufs and jdata bufs in the same journal. So each
- * type gets its own log header, for which we need to reserve a block.
- * In fact, each type has the potential for needing more than one header
- * in cases where we have more buffers than will fit on a journal page.
- * Metadata journal entries take up half the space of journaled buffer entries.
- * Thus, metadata entries have buf_limit (502) and journaled buffers have
- * databuf_limit (251) before they cause a wrap around.
- *
- * 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 = 0;
- unsigned int mbuf;
- unsigned int dbuf;
- struct gfs2_trans *tr = sdp->sd_log_tr;
- if (tr) {
- mbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
- dbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
- reserved = mbuf + dbuf;
- /* Account for header blocks */
- reserved += DIV_ROUND_UP(mbuf, buf_limit(sdp));
- reserved += DIV_ROUND_UP(dbuf, databuf_limit(sdp));
- }
- if (sdp->sd_log_committed_revoke > 0)
- reserved += gfs2_struct2blk(sdp, sdp->sd_log_committed_revoke);
- /* One for the overall header */
- if (reserved)
- reserved++;
- return reserved;
- }
- static unsigned int current_tail(struct gfs2_sbd *sdp)
- {
- struct gfs2_trans *tr;
- unsigned int tail;
- spin_lock(&sdp->sd_ail_lock);
- if (list_empty(&sdp->sd_ail1_list)) {
- tail = sdp->sd_log_head;
- } else {
- tr = list_last_entry(&sdp->sd_ail1_list, struct gfs2_trans,
- tr_list);
- tail = tr->tr_first;
- }
- spin_unlock(&sdp->sd_ail_lock);
- return tail;
- }
- static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
- {
- unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
- ail2_empty(sdp, new_tail);
- atomic_add(dist, &sdp->sd_log_blks_free);
- trace_gfs2_log_blocks(sdp, dist);
- gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
- sdp->sd_jdesc->jd_blocks);
- 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, struct list_head *a, 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_write_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_write_revokes(struct gfs2_sbd *sdp)
- {
- /* number of revokes we still have room for */
- int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
- gfs2_log_lock(sdp);
- while (sdp->sd_log_num_revoke > max_revokes)
- max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
- max_revokes -= sdp->sd_log_num_revoke;
- if (!sdp->sd_log_num_revoke) {
- atomic_dec(&sdp->sd_log_blks_free);
- /* If no blocks have been reserved, we need to also
- * reserve a block for the header */
- if (!sdp->sd_log_blks_reserved) {
- atomic_dec(&sdp->sd_log_blks_free);
- trace_gfs2_log_blocks(sdp, -2);
- } else {
- trace_gfs2_log_blocks(sdp, -1);
- }
- }
- gfs2_ail1_empty(sdp, max_revokes);
- gfs2_log_unlock(sdp);
- if (!sdp->sd_log_num_revoke) {
- atomic_inc(&sdp->sd_log_blks_free);
- if (!sdp->sd_log_blks_reserved) {
- atomic_inc(&sdp->sd_log_blks_free);
- trace_gfs2_log_blocks(sdp, 2);
- } else {
- trace_gfs2_log_blocks(sdp, 1);
- }
- }
- }
- /**
- * 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,
- int 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))
- goto out;
- 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 {
- int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock);
- 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, page, sb->s_blocksize, 0, dblock);
- gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE | op_flags);
- out:
- log_flush_wait(sdp);
- }
- /**
- * 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)
- {
- unsigned int tail;
- int op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
- enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
- gfs2_assert_withdraw(sdp, (state != SFS_FROZEN));
- tail = current_tail(sdp);
- 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 = (tail == sdp->sd_log_flush_head);
- gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail,
- sdp->sd_log_flush_head, flags, op_flags);
- gfs2_log_incr_head(sdp);
- if (sdp->sd_log_tail != tail)
- log_pull_tail(sdp, tail);
- }
- /**
- * ail_drain - drain the ail lists after a withdraw
- * @sdp: Pointer to GFS2 superblock
- */
- static void 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);
- }
- 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;
- enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
- down_write(&sdp->sd_log_flush_lock);
- /*
- * 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))
- 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;
- trace_gfs2_log_flush(sdp, 1, flags);
- if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
- clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
- sdp->sd_log_flush_head = sdp->sd_log_head;
- tr = sdp->sd_log_tr;
- if (tr) {
- sdp->sd_log_tr = NULL;
- tr->tr_first = sdp->sd_log_flush_head;
- if (unlikely (state == SFS_FROZEN))
- if (gfs2_assert_withdraw_delayed(sdp,
- !tr->tr_num_buf_new && !tr->tr_num_databuf_new))
- goto out_withdraw;
- }
- if (unlikely(state == SFS_FROZEN))
- if (gfs2_assert_withdraw_delayed(sdp, !sdp->sd_log_num_revoke))
- goto out_withdraw;
- if (gfs2_assert_withdraw_delayed(sdp,
- sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke))
- 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_log_bio, REQ_OP_WRITE);
- if (gfs2_withdrawn(sdp))
- goto out_withdraw;
- if (sdp->sd_log_head != sdp->sd_log_flush_head) {
- log_flush_wait(sdp);
- log_write_header(sdp, flags);
- } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
- atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
- trace_gfs2_log_blocks(sdp, -1);
- log_write_header(sdp, flags);
- }
- if (gfs2_withdrawn(sdp))
- goto out_withdraw;
- lops_after_commit(sdp, tr);
- gfs2_log_lock(sdp);
- sdp->sd_log_head = sdp->sd_log_flush_head;
- sdp->sd_log_blks_reserved = 0;
- sdp->sd_log_committed_revoke = 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;
- atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
- trace_gfs2_log_blocks(sdp, -1);
- log_write_header(sdp, flags);
- sdp->sd_log_head = sdp->sd_log_flush_head;
- }
- if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
- GFS2_LOG_HEAD_FLUSH_FREEZE))
- gfs2_log_shutdown(sdp);
- if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE)
- atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
- }
- out_end:
- trace_gfs2_log_flush(sdp, 0, flags);
- out:
- up_write(&sdp->sd_log_flush_lock);
- gfs2_trans_free(sdp, tr);
- if (gfs2_withdrawing(sdp))
- gfs2_withdraw(sdp);
- 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);
- ail_drain(sdp); /* frees all transactions */
- tr = NULL;
- goto out_end;
- }
- /**
- * gfs2_merge_trans - Merge a new transaction into a cached transaction
- * @old: Original transaction to be expanded
- * @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_num_revoke += new->tr_num_revoke;
- old->tr_num_revoke_rm += new->tr_num_revoke_rm;
- 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_ALLOCED, &tr->tr_flags));
- sdp->sd_log_tr = tr;
- set_bit(TR_ATTACHED, &tr->tr_flags);
- }
- sdp->sd_log_committed_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
- reserved = calc_reserved(sdp);
- maxres = sdp->sd_log_blks_reserved + tr->tr_reserved;
- gfs2_assert_withdraw(sdp, maxres >= reserved);
- unused = maxres - reserved;
- atomic_add(unused, &sdp->sd_log_blks_free);
- trace_gfs2_log_blocks(sdp, unused);
- gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
- sdp->sd_jdesc->jd_blocks);
- sdp->sd_log_blks_reserved = reserved;
- gfs2_log_unlock(sdp);
- }
- /**
- * 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 (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
- ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
- atomic_read(&sdp->sd_log_thresh2)))
- 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));
- sdp->sd_log_flush_head = sdp->sd_log_head;
- log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN);
- gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
- gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
- sdp->sd_log_head = sdp->sd_log_flush_head;
- sdp->sd_log_tail = sdp->sd_log_head;
- }
- 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)
- {
- unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
- if (test_and_clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags))
- return 1;
- return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >=
- atomic_read(&sdp->sd_log_thresh2);
- }
- /**
- * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
- * @sdp: 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;
- DEFINE_WAIT(wait);
- bool did_flush;
- while (!kthread_should_stop()) {
- if (gfs2_withdrawn(sdp)) {
- msleep_interruptible(HZ);
- continue;
- }
- /* 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);
- continue;
- }
- did_flush = false;
- 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);
- did_flush = true;
- }
- if (gfs2_ail_flush_reqd(sdp)) {
- 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);
- did_flush = true;
- }
- if (!gfs2_ail_flush_reqd(sdp) || did_flush)
- wake_up(&sdp->sd_log_waitq);
- t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
- try_to_freeze();
- do {
- prepare_to_wait(&sdp->sd_logd_waitq, &wait,
- TASK_INTERRUPTIBLE);
- if (!gfs2_ail_flush_reqd(sdp) &&
- !gfs2_jrnl_flush_reqd(sdp) &&
- !kthread_should_stop())
- t = schedule_timeout(t);
- } while(t && !gfs2_ail_flush_reqd(sdp) &&
- !gfs2_jrnl_flush_reqd(sdp) &&
- !kthread_should_stop());
- finish_wait(&sdp->sd_logd_waitq, &wait);
- }
- return 0;
- }
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