| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2006 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 "gfs2.h" |
| #include "lm_interface.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" |
| |
| #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; |
| } |
| |
| void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) |
| { |
| struct list_head *head = &sdp->sd_ail1_list; |
| u64 sync_gen; |
| struct list_head *first, *tmp; |
| struct gfs2_ail *first_ai, *ai; |
| |
| gfs2_log_lock(sdp); |
| if (list_empty(head)) { |
| gfs2_log_unlock(sdp); |
| return; |
| } |
| sync_gen = sdp->sd_ail_sync_gen++; |
| |
| first = head->prev; |
| first_ai = list_entry(first, struct gfs2_ail, ai_list); |
| first_ai->ai_sync_gen = sync_gen; |
| gfs2_ail1_start_one(sdp, first_ai); |
| |
| if (flags & DIO_ALL) |
| first = NULL; |
| |
| for (;;) { |
| if (first && (head->prev != first || |
| gfs2_ail1_empty_one(sdp, first_ai, 0))) |
| break; |
| |
| for (tmp = head->prev; tmp != head; tmp = tmp->prev) { |
| ai = list_entry(tmp, struct gfs2_ail, ai_list); |
| if (ai->ai_sync_gen >= sync_gen) |
| continue; |
| ai->ai_sync_gen = sync_gen; |
| gfs2_ail1_start_one(sdp, ai); |
| break; |
| } |
| |
| if (tmp == head) |
| break; |
| } |
| |
| gfs2_log_unlock(sdp); |
| } |
| |
| 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; |
| } |
| |
| 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 |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) |
| { |
| unsigned int try = 0; |
| |
| if (gfs2_assert_warn(sdp, blks) || |
| gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) |
| return -EINVAL; |
| |
| mutex_lock(&sdp->sd_log_reserve_mutex); |
| gfs2_log_lock(sdp); |
| while(sdp->sd_log_blks_free <= blks) { |
| gfs2_log_unlock(sdp); |
| gfs2_ail1_empty(sdp, 0); |
| gfs2_log_flush(sdp, NULL); |
| |
| if (try++) |
| gfs2_ail1_start(sdp, 0); |
| gfs2_log_lock(sdp); |
| } |
| sdp->sd_log_blks_free -= blks; |
| gfs2_log_unlock(sdp); |
| mutex_unlock(&sdp->sd_log_reserve_mutex); |
| |
| down_read(&sdp->sd_log_flush_lock); |
| |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| |
| gfs2_log_lock(sdp); |
| sdp->sd_log_blks_free += blks; |
| gfs2_assert_withdraw(sdp, |
| sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
| gfs2_log_unlock(sdp); |
| up_read(&sdp->sd_log_flush_lock); |
| } |
| |
| static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) |
| { |
| int new = 0; |
| u64 dbn; |
| int error; |
| int bdy; |
| |
| error = gfs2_block_map(sdp->sd_jdesc->jd_inode, lbn, &new, &dbn, &bdy); |
| if (error || !dbn) |
| printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, (unsigned long long)dbn, lbn); |
| gfs2_assert_withdraw(sdp, !error && dbn); |
| |
| return dbn; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| 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; |
| } |
| |
| static inline void log_incr_head(struct gfs2_sbd *sdp) |
| { |
| if (sdp->sd_log_flush_head == sdp->sd_log_tail) |
| gfs2_assert_withdraw(sdp, 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_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 gfs2_log_buf *lb; |
| struct buffer_head *bh; |
| |
| lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
| list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
| |
| bh = lb->lb_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); |
| unlock_buffer(bh); |
| |
| log_incr_head(sdp); |
| |
| return bh; |
| } |
| |
| /** |
| * 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 gfs2_log_buf *lb; |
| struct buffer_head *bh; |
| |
| lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); |
| list_add(&lb->lb_list, &sdp->sd_log_flush_list); |
| lb->lb_real = real; |
| |
| bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); |
| atomic_set(&bh->b_count, 1); |
| bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); |
| 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; |
| |
| log_incr_head(sdp); |
| |
| return bh; |
| } |
| |
| static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) |
| { |
| unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); |
| |
| ail2_empty(sdp, new_tail); |
| |
| gfs2_log_lock(sdp); |
| sdp->sd_log_blks_free += dist - (pull ? 1 : 0); |
| gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); |
| gfs2_log_unlock(sdp); |
| |
| 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); |
| unlock_buffer(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.mh_format = cpu_to_be32(GFS2_FORMAT_LH); |
| 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); |
| |
| set_buffer_dirty(bh); |
| if (sync_dirty_buffer(bh)) |
| gfs2_io_error_bh(sdp, bh); |
| brelse(bh); |
| |
| if (sdp->sd_log_tail != tail) |
| log_pull_tail(sdp, tail, pull); |
| else |
| gfs2_assert_withdraw(sdp, !pull); |
| |
| sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); |
| log_incr_head(sdp); |
| } |
| |
| static void log_flush_commit(struct gfs2_sbd *sdp) |
| { |
| struct list_head *head = &sdp->sd_log_flush_list; |
| struct gfs2_log_buf *lb; |
| struct buffer_head *bh; |
| |
| while (!list_empty(head)) { |
| lb = list_entry(head->next, struct gfs2_log_buf, lb_list); |
| list_del(&lb->lb_list); |
| bh = lb->lb_bh; |
| |
| wait_on_buffer(bh); |
| if (!buffer_uptodate(bh)) |
| gfs2_io_error_bh(sdp, bh); |
| if (lb->lb_real) { |
| while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ |
| schedule(); |
| free_buffer_head(bh); |
| } else |
| brelse(bh); |
| kfree(lb); |
| } |
| |
| log_write_header(sdp, 0, 0); |
| } |
| |
| /** |
| * 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); |
| |
| if (gl) { |
| gfs2_log_lock(sdp); |
| if (list_empty(&gl->gl_le.le_list)) { |
| gfs2_log_unlock(sdp); |
| up_write(&sdp->sd_log_flush_lock); |
| return; |
| } |
| gfs2_log_unlock(sdp); |
| } |
| |
| ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); |
| INIT_LIST_HEAD(&ai->ai_ail1_list); |
| INIT_LIST_HEAD(&ai->ai_ail2_list); |
| |
| gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf); |
| 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; |
| |
| lops_before_commit(sdp); |
| if (!list_empty(&sdp->sd_log_flush_list)) |
| log_flush_commit(sdp); |
| else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) |
| log_write_header(sdp, 0, PULL); |
| lops_after_commit(sdp, ai); |
| sdp->sd_log_head = sdp->sd_log_flush_head; |
| |
| sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs; |
| |
| sdp->sd_log_blks_reserved = 0; |
| sdp->sd_log_commited_buf = 0; |
| sdp->sd_log_num_hdrs = 0; |
| sdp->sd_log_commited_revoke = 0; |
| |
| gfs2_log_lock(sdp); |
| if (!list_empty(&ai->ai_ail1_list)) { |
| list_add(&ai->ai_list, &sdp->sd_ail1_list); |
| ai = NULL; |
| } |
| gfs2_log_unlock(sdp); |
| |
| sdp->sd_vfs->s_dirt = 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 = 0; |
| unsigned int old; |
| |
| gfs2_log_lock(sdp); |
| |
| sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; |
| gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); |
| sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; |
| gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); |
| |
| if (sdp->sd_log_commited_buf) |
| reserved += sdp->sd_log_commited_buf; |
| if (sdp->sd_log_commited_revoke) |
| reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, |
| sizeof(u64)); |
| if (reserved) |
| reserved++; |
| |
| old = sdp->sd_log_blks_free; |
| sdp->sd_log_blks_free += tr->tr_reserved - |
| (reserved - sdp->sd_log_blks_reserved); |
| |
| gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); |
| gfs2_assert_withdraw(sdp, |
| sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks + |
| sdp->sd_log_num_hdrs); |
| |
| 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 |
| * |
| * Returns: errno |
| */ |
| |
| void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) |
| { |
| log_refund(sdp, tr); |
| lops_incore_commit(sdp, tr); |
| |
| sdp->sd_vfs->s_dirt = 1; |
| up_read(&sdp->sd_log_flush_lock); |
| |
| gfs2_log_lock(sdp); |
| if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) { |
| gfs2_log_unlock(sdp); |
| gfs2_log_flush(sdp, NULL); |
| } else { |
| gfs2_log_unlock(sdp); |
| } |
| } |
| |
| /** |
| * 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_gl); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); |
| gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); |
| 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, !sdp->sd_log_num_hdrs); |
| 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, 0); |
| |
| gfs2_assert_warn(sdp, 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); |
| } |
| |