| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License version 2. |
| */ |
| |
| #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/delay.h> |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| #include <linux/bio.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" |
| |
| #define PULL 1 |
| |
| /** |
| * gfs2_struct2blk - compute stuff |
| * @sdp: the filesystem |
| * @nstruct: the number of structures |
| * @ssize: the size of the 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 ssize) |
| { |
| unsigned int blks; |
| unsigned int first, second; |
| |
| blks = 1; |
| first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize; |
| |
| if (nstruct > first) { |
| second = (sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_meta_header)) / ssize; |
| 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 log lock _must_ be held when calling this function |
| * |
| */ |
| |
| void gfs2_remove_from_ail(struct gfs2_bufdata *bd) |
| { |
| bd->bd_ail = 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 |
| * @tr: the part of the AIL |
| * |
| */ |
| |
| static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) |
| __releases(&sdp->sd_log_lock) |
| __acquires(&sdp->sd_log_lock) |
| { |
| struct gfs2_bufdata *bd, *s; |
| struct buffer_head *bh; |
| int retry; |
| |
| do { |
| retry = 0; |
| |
| list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, |
| bd_ail_st_list) { |
| bh = bd->bd_bh; |
| |
| gfs2_assert(sdp, bd->bd_ail == ai); |
| |
| if (!buffer_busy(bh)) { |
| if (!buffer_uptodate(bh)) |
| gfs2_io_error_bh(sdp, bh); |
| list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); |
| continue; |
| } |
| |
| if (!buffer_dirty(bh)) |
| continue; |
| |
| list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); |
| |
| get_bh(bh); |
| gfs2_log_unlock(sdp); |
| lock_buffer(bh); |
| if (test_clear_buffer_dirty(bh)) { |
| bh->b_end_io = end_buffer_write_sync; |
| submit_bh(WRITE_SYNC_PLUG, bh); |
| } else { |
| unlock_buffer(bh); |
| brelse(bh); |
| } |
| gfs2_log_lock(sdp); |
| |
| retry = 1; |
| break; |
| } |
| } while (retry); |
| } |
| |
| /** |
| * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced |
| * @sdp: the filesystem |
| * @ai: the AIL entry |
| * |
| */ |
| |
| static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) |
| { |
| struct gfs2_bufdata *bd, *s; |
| struct buffer_head *bh; |
| |
| list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, |
| bd_ail_st_list) { |
| bh = bd->bd_bh; |
| |
| gfs2_assert(sdp, bd->bd_ail == ai); |
| |
| if (buffer_busy(bh)) { |
| if (flags & DIO_ALL) |
| continue; |
| else |
| break; |
| } |
| |
| if (!buffer_uptodate(bh)) |
| gfs2_io_error_bh(sdp, bh); |
| |
| list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); |
| } |
| |
| return list_empty(&ai->ai_ail1_list); |
| } |
| |
| static void gfs2_ail1_start(struct gfs2_sbd *sdp) |
| { |
| struct list_head *head; |
| u64 sync_gen; |
| struct gfs2_ail *ai; |
| int done = 0; |
| |
| gfs2_log_lock(sdp); |
| head = &sdp->sd_ail1_list; |
| if (list_empty(head)) { |
| gfs2_log_unlock(sdp); |
| return; |
| } |
| sync_gen = sdp->sd_ail_sync_gen++; |
| |
| while(!done) { |
| done = 1; |
| list_for_each_entry_reverse(ai, head, ai_list) { |
| if (ai->ai_sync_gen >= sync_gen) |
| continue; |
| ai->ai_sync_gen = sync_gen; |
| gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ |
| done = 0; |
| break; |
| } |
| } |
| |
| gfs2_log_unlock(sdp); |
| } |
| |
| static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) |
| { |
| struct gfs2_ail *ai, *s; |
| int ret; |
| |
| gfs2_log_lock(sdp); |
| |
| list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { |
| if (gfs2_ail1_empty_one(sdp, ai, flags)) |
| list_move(&ai->ai_list, &sdp->sd_ail2_list); |
| else if (!(flags & DIO_ALL)) |
| break; |
| } |
| |
| ret = list_empty(&sdp->sd_ail1_list); |
| |
| gfs2_log_unlock(sdp); |
| |
| return ret; |
| } |
| |
| |
| /** |
| * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced |
| * @sdp: the filesystem |
| * @ai: the AIL entry |
| * |
| */ |
| |
| static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) |
| { |
| struct list_head *head = &ai->ai_ail2_list; |
| struct gfs2_bufdata *bd; |
| |
| while (!list_empty(head)) { |
| bd = list_entry(head->prev, struct gfs2_bufdata, |
| bd_ail_st_list); |
| gfs2_assert(sdp, bd->bd_ail == ai); |
| gfs2_remove_from_ail(bd); |
| } |
| } |
| |
| static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) |
| { |
| struct gfs2_ail *ai, *safe; |
| unsigned int old_tail = sdp->sd_log_tail; |
| int wrap = (new_tail < old_tail); |
| int a, b, rm; |
| |
| gfs2_log_lock(sdp); |
| |
| list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { |
| a = (old_tail <= ai->ai_first); |
| b = (ai->ai_first < new_tail); |
| rm = (wrap) ? (a || b) : (a && b); |
| if (!rm) |
| continue; |
| |
| gfs2_ail2_empty_one(sdp, ai); |
| list_del(&ai->ai_list); |
| gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); |
| gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); |
| kfree(ai); |
| } |
| |
| gfs2_log_unlock(sdp); |
| } |
| |
| /** |
| * 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) |
| { |
| unsigned reserved_blks = 6 * (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; |
| 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); |
| } |
| if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks, |
| free_blocks - blks) != free_blocks) |
| goto retry; |
| 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); |
| |
| return 0; |
| } |
| |
| static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
| { |
| struct gfs2_journal_extent *je; |
| |
| list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) { |
| if (lbn >= je->lblock && lbn < je->lblock + je->blocks) |
| return je->dblock + lbn - je->lblock; |
| } |
| |
| return -1; |
| } |
| |
| /** |
| * 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_limit, metabufhdrs_needed; |
| unsigned int dbuf_limit, databufhdrs_needed; |
| unsigned int revokes = 0; |
| |
| mbuf_limit = buf_limit(sdp); |
| metabufhdrs_needed = (sdp->sd_log_commited_buf + |
| (mbuf_limit - 1)) / mbuf_limit; |
| dbuf_limit = databuf_limit(sdp); |
| databufhdrs_needed = (sdp->sd_log_commited_databuf + |
| (dbuf_limit - 1)) / dbuf_limit; |
| |
| if (sdp->sd_log_commited_revoke > 0) |
| revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, |
| sizeof(u64)); |
| |
| reserved = sdp->sd_log_commited_buf + metabufhdrs_needed + |
| sdp->sd_log_commited_databuf + databufhdrs_needed + |
| revokes; |
| /* One for the overall header */ |
| if (reserved) |
| reserved++; |
| return reserved; |
| } |
| |
| static unsigned int current_tail(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_ail *ai; |
| unsigned int tail; |
| |
| gfs2_log_lock(sdp); |
| |
| if (list_empty(&sdp->sd_ail1_list)) { |
| tail = sdp->sd_log_head; |
| } else { |
| ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); |
| tail = ai->ai_first; |
| } |
| |
| gfs2_log_unlock(sdp); |
| |
| return tail; |
| } |
| |
| void gfs2_log_incr_head(struct gfs2_sbd *sdp) |
| { |
| if (sdp->sd_log_flush_head == sdp->sd_log_tail) |
| BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head); |
| |
| if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { |
| sdp->sd_log_flush_head = 0; |
| sdp->sd_log_flush_wrapped = 1; |
| } |
| } |
| |
| /** |
| * gfs2_log_write_endio - End of I/O for a log buffer |
| * @bh: The buffer head |
| * @uptodate: I/O Status |
| * |
| */ |
| |
| static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate) |
| { |
| struct gfs2_sbd *sdp = bh->b_private; |
| bh->b_private = NULL; |
| |
| end_buffer_write_sync(bh, uptodate); |
| if (atomic_dec_and_test(&sdp->sd_log_in_flight)) |
| wake_up(&sdp->sd_log_flush_wait); |
| } |
| |
| /** |
| * gfs2_log_get_buf - Get and initialize a buffer to use for log control data |
| * @sdp: The GFS2 superblock |
| * |
| * Returns: the buffer_head |
| */ |
| |
| struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) |
| { |
| u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
| struct buffer_head *bh; |
| |
| bh = sb_getblk(sdp->sd_vfs, blkno); |
| lock_buffer(bh); |
| memset(bh->b_data, 0, bh->b_size); |
| set_buffer_uptodate(bh); |
| clear_buffer_dirty(bh); |
| gfs2_log_incr_head(sdp); |
| atomic_inc(&sdp->sd_log_in_flight); |
| bh->b_private = sdp; |
| bh->b_end_io = gfs2_log_write_endio; |
| |
| return bh; |
| } |
| |
| /** |
| * gfs2_fake_write_endio - |
| * @bh: The buffer head |
| * @uptodate: The I/O Status |
| * |
| */ |
| |
| static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate) |
| { |
| struct buffer_head *real_bh = bh->b_private; |
| struct gfs2_bufdata *bd = real_bh->b_private; |
| struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd; |
| |
| end_buffer_write_sync(bh, uptodate); |
| free_buffer_head(bh); |
| unlock_buffer(real_bh); |
| brelse(real_bh); |
| if (atomic_dec_and_test(&sdp->sd_log_in_flight)) |
| wake_up(&sdp->sd_log_flush_wait); |
| } |
| |
| /** |
| * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log |
| * @sdp: the filesystem |
| * @data: the data the buffer_head should point to |
| * |
| * Returns: the log buffer descriptor |
| */ |
| |
| struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, |
| struct buffer_head *real) |
| { |
| u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
| struct buffer_head *bh; |
| |
| bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); |
| atomic_set(&bh->b_count, 1); |
| bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock); |
| set_bh_page(bh, real->b_page, bh_offset(real)); |
| bh->b_blocknr = blkno; |
| bh->b_size = sdp->sd_sb.sb_bsize; |
| bh->b_bdev = sdp->sd_vfs->s_bdev; |
| bh->b_private = real; |
| bh->b_end_io = gfs2_fake_write_endio; |
| |
| gfs2_log_incr_head(sdp); |
| atomic_inc(&sdp->sd_log_in_flight); |
| |
| return bh; |
| } |
| |
| 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; |
| } |
| |
| /** |
| * log_write_header - Get and initialize a journal header buffer |
| * @sdp: The GFS2 superblock |
| * |
| * Returns: the initialized log buffer descriptor |
| */ |
| |
| static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) |
| { |
| u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); |
| struct buffer_head *bh; |
| struct gfs2_log_header *lh; |
| unsigned int tail; |
| u32 hash; |
| |
| bh = sb_getblk(sdp->sd_vfs, blkno); |
| lock_buffer(bh); |
| memset(bh->b_data, 0, bh->b_size); |
| set_buffer_uptodate(bh); |
| clear_buffer_dirty(bh); |
| |
| gfs2_ail1_empty(sdp, 0); |
| tail = current_tail(sdp); |
| |
| lh = (struct gfs2_log_header *)bh->b_data; |
| memset(lh, 0, sizeof(struct gfs2_log_header)); |
| 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(sdp->sd_log_sequence++); |
| lh->lh_flags = cpu_to_be32(flags); |
| lh->lh_tail = cpu_to_be32(tail); |
| lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); |
| hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); |
| lh->lh_hash = cpu_to_be32(hash); |
| |
| bh->b_end_io = end_buffer_write_sync; |
| if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) |
| goto skip_barrier; |
| get_bh(bh); |
| submit_bh(WRITE_SYNC | (1 << BIO_RW_BARRIER) | (1 << BIO_RW_META), bh); |
| wait_on_buffer(bh); |
| if (buffer_eopnotsupp(bh)) { |
| clear_buffer_eopnotsupp(bh); |
| set_buffer_uptodate(bh); |
| fs_info(sdp, "barrier sync failed - disabling barriers\n"); |
| set_bit(SDF_NOBARRIERS, &sdp->sd_flags); |
| lock_buffer(bh); |
| skip_barrier: |
| get_bh(bh); |
| submit_bh(WRITE_SYNC | (1 << BIO_RW_META), bh); |
| wait_on_buffer(bh); |
| } |
| if (!buffer_uptodate(bh)) |
| gfs2_io_error_bh(sdp, bh); |
| brelse(bh); |
| |
| if (sdp->sd_log_tail != tail) |
| log_pull_tail(sdp, tail); |
| else |
| gfs2_assert_withdraw(sdp, !pull); |
| |
| sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); |
| gfs2_log_incr_head(sdp); |
| } |
| |
| static void log_flush_commit(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); |
| } |
| |
| log_write_header(sdp, 0, 0); |
| } |
| |
| static void gfs2_ordered_write(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_bufdata *bd; |
| struct buffer_head *bh; |
| LIST_HEAD(written); |
| |
| gfs2_log_lock(sdp); |
| while (!list_empty(&sdp->sd_log_le_ordered)) { |
| bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list); |
| list_move(&bd->bd_le.le_list, &written); |
| bh = bd->bd_bh; |
| if (!buffer_dirty(bh)) |
| continue; |
| get_bh(bh); |
| gfs2_log_unlock(sdp); |
| lock_buffer(bh); |
| if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) { |
| bh->b_end_io = end_buffer_write_sync; |
| submit_bh(WRITE_SYNC_PLUG, bh); |
| } else { |
| unlock_buffer(bh); |
| brelse(bh); |
| } |
| gfs2_log_lock(sdp); |
| } |
| list_splice(&written, &sdp->sd_log_le_ordered); |
| gfs2_log_unlock(sdp); |
| } |
| |
| static void gfs2_ordered_wait(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_bufdata *bd; |
| struct buffer_head *bh; |
| |
| gfs2_log_lock(sdp); |
| while (!list_empty(&sdp->sd_log_le_ordered)) { |
| bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list); |
| bh = bd->bd_bh; |
| if (buffer_locked(bh)) { |
| get_bh(bh); |
| gfs2_log_unlock(sdp); |
| wait_on_buffer(bh); |
| brelse(bh); |
| gfs2_log_lock(sdp); |
| continue; |
| } |
| list_del_init(&bd->bd_le.le_list); |
| } |
| gfs2_log_unlock(sdp); |
| } |
| |
| /** |
| * gfs2_log_flush - flush incore transaction(s) |
| * @sdp: the filesystem |
| * @gl: The glock structure to flush. If NULL, flush the whole incore log |
| * |
| */ |
| |
| void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) |
| { |
| struct gfs2_ail *ai; |
| |
| down_write(&sdp->sd_log_flush_lock); |
| |
| /* Log might have been flushed while we waited for the flush lock */ |
| if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) { |
| up_write(&sdp->sd_log_flush_lock); |
| return; |
| } |
| trace_gfs2_log_flush(sdp, 1); |
| |
| ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
| INIT_LIST_HEAD(&ai->ai_ail1_list); |
| INIT_LIST_HEAD(&ai->ai_ail2_list); |
| |
| if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) { |
| printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf, |
| sdp->sd_log_commited_buf); |
| gfs2_assert_withdraw(sdp, 0); |
| } |
| if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) { |
| printk(KERN_INFO "GFS2: log databuf %u %u\n", |
| sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf); |
| gfs2_assert_withdraw(sdp, 0); |
| } |
| gfs2_assert_withdraw(sdp, |
| sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); |
| |
| sdp->sd_log_flush_head = sdp->sd_log_head; |
| sdp->sd_log_flush_wrapped = 0; |
| ai->ai_first = sdp->sd_log_flush_head; |
| |
| gfs2_ordered_write(sdp); |
| lops_before_commit(sdp); |
| gfs2_ordered_wait(sdp); |
| |
| if (sdp->sd_log_head != sdp->sd_log_flush_head) |
| log_flush_commit(sdp); |
| else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ |
| gfs2_log_lock(sdp); |
| atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ |
| trace_gfs2_log_blocks(sdp, -1); |
| gfs2_log_unlock(sdp); |
| log_write_header(sdp, 0, PULL); |
| } |
| lops_after_commit(sdp, ai); |
| |
| gfs2_log_lock(sdp); |
| sdp->sd_log_head = sdp->sd_log_flush_head; |
| sdp->sd_log_blks_reserved = 0; |
| sdp->sd_log_commited_buf = 0; |
| sdp->sd_log_commited_databuf = 0; |
| sdp->sd_log_commited_revoke = 0; |
| |
| if (!list_empty(&ai->ai_ail1_list)) { |
| list_add(&ai->ai_list, &sdp->sd_ail1_list); |
| ai = NULL; |
| } |
| gfs2_log_unlock(sdp); |
| trace_gfs2_log_flush(sdp, 0); |
| up_write(&sdp->sd_log_flush_lock); |
| |
| kfree(ai); |
| } |
| |
| static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) |
| { |
| unsigned int reserved; |
| unsigned int unused; |
| |
| gfs2_log_lock(sdp); |
| |
| sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; |
| sdp->sd_log_commited_databuf += tr->tr_num_databuf_new - |
| tr->tr_num_databuf_rm; |
| gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) || |
| (((int)sdp->sd_log_commited_databuf) >= 0)); |
| sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; |
| reserved = calc_reserved(sdp); |
| gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved); |
| unused = sdp->sd_log_blks_reserved - reserved + tr->tr_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); |
| } |
| |
| static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) |
| { |
| struct list_head *head = &tr->tr_list_buf; |
| struct gfs2_bufdata *bd; |
| |
| gfs2_log_lock(sdp); |
| while (!list_empty(head)) { |
| bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr); |
| list_del_init(&bd->bd_list_tr); |
| tr->tr_num_buf--; |
| } |
| gfs2_log_unlock(sdp); |
| gfs2_assert_warn(sdp, !tr->tr_num_buf); |
| } |
| |
| /** |
| * 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 1/3rd of journal size, thresh2 is 2/3rd of |
| * journal size. |
| * |
| * Returns: errno |
| */ |
| |
| void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) |
| { |
| log_refund(sdp, tr); |
| buf_lo_incore_commit(sdp, tr); |
| |
| up_read(&sdp->sd_log_flush_lock); |
| |
| 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 |
| * |
| */ |
| |
| void gfs2_log_shutdown(struct gfs2_sbd *sdp) |
| { |
| down_write(&sdp->sd_log_flush_lock); |
| |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); |
| gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); |
| |
| sdp->sd_log_flush_head = sdp->sd_log_head; |
| sdp->sd_log_flush_wrapped = 0; |
| |
| log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, |
| (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL); |
| |
| gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks); |
| 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; |
| |
| up_write(&sdp->sd_log_flush_lock); |
| } |
| |
| |
| /** |
| * gfs2_meta_syncfs - sync all the buffers in a filesystem |
| * @sdp: the filesystem |
| * |
| */ |
| |
| void gfs2_meta_syncfs(struct gfs2_sbd *sdp) |
| { |
| gfs2_log_flush(sdp, NULL); |
| for (;;) { |
| gfs2_ail1_start(sdp); |
| if (gfs2_ail1_empty(sdp, DIO_ALL)) |
| break; |
| msleep(10); |
| } |
| } |
| |
| static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp) |
| { |
| return (atomic_read(&sdp->sd_log_pinned) >= 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); |
| return used_blocks >= 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); |
| unsigned preflush; |
| |
| while (!kthread_should_stop()) { |
| |
| preflush = atomic_read(&sdp->sd_log_pinned); |
| if (gfs2_jrnl_flush_reqd(sdp) || t == 0) { |
| gfs2_ail1_empty(sdp, DIO_ALL); |
| gfs2_log_flush(sdp, NULL); |
| gfs2_ail1_empty(sdp, DIO_ALL); |
| } |
| |
| if (gfs2_ail_flush_reqd(sdp)) { |
| gfs2_ail1_start(sdp); |
| io_schedule(); |
| gfs2_ail1_empty(sdp, 0); |
| gfs2_log_flush(sdp, NULL); |
| gfs2_ail1_empty(sdp, DIO_ALL); |
| } |
| |
| wake_up(&sdp->sd_log_waitq); |
| t = gfs2_tune_get(sdp, gt_logd_secs) * HZ; |
| if (freezing(current)) |
| refrigerator(); |
| |
| 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; |
| } |
| |