X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=fs%2Fgfs2%2Flog.c;h=4752eadc7f6efda56c1e60bcea78900a895467f7;hb=6a76a6992341faab0ef31e7d97000e0cf336d0ba;hp=756fae9eaf8f1c724c288daf394458c05ec9cfad;hpb=5ed59af85077d28875a3a137b21933aaf1b4cd50;p=~andy%2Flinux diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index 756fae9eaf8..4752eadc7f6 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "gfs2.h" #include "incore.h" @@ -358,7 +359,7 @@ retry: return 0; } -static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) +u64 gfs2_log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) { struct gfs2_journal_extent *je; @@ -467,8 +468,8 @@ static unsigned int current_tail(struct gfs2_sbd *sdp) 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); + BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) && + (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; @@ -476,99 +477,6 @@ void gfs2_log_incr_head(struct gfs2_sbd *sdp) } } -/** - * 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); @@ -583,66 +491,8 @@ static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) 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); - 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; - get_bh(bh); - if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) - submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh); - else - submit_bh(WRITE_FLUSH_FUA | REQ_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) +static void log_flush_wait(struct gfs2_sbd *sdp) { DEFINE_WAIT(wait); @@ -655,8 +505,20 @@ static void log_flush_commit(struct gfs2_sbd *sdp) } while(atomic_read(&sdp->sd_log_in_flight)); finish_wait(&sdp->sd_log_flush_wait, &wait); } +} + +static int bd_cmp(void *priv, struct list_head *a, struct list_head *b) +{ + struct gfs2_bufdata *bda, *bdb; - log_write_header(sdp, 0, 0); + bda = list_entry(a, struct gfs2_bufdata, bd_le.le_list); + bdb = list_entry(b, struct gfs2_bufdata, bd_le.le_list); + + if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr) + return -1; + if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr) + return 1; + return 0; } static void gfs2_ordered_write(struct gfs2_sbd *sdp) @@ -666,6 +528,7 @@ static void gfs2_ordered_write(struct gfs2_sbd *sdp) LIST_HEAD(written); gfs2_log_lock(sdp); + list_sort(NULL, &sdp->sd_log_le_ordered, &bd_cmp); 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); @@ -710,6 +573,68 @@ static void gfs2_ordered_wait(struct gfs2_sbd *sdp) gfs2_log_unlock(sdp); } +/** + * 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 = gfs2_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); + 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; + get_bh(bh); + if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) { + gfs2_ordered_wait(sdp); + log_flush_wait(sdp); + submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh); + } else { + submit_bh(WRITE_FLUSH_FUA | REQ_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); +} + /** * gfs2_log_flush - flush incore transaction(s) * @sdp: the filesystem @@ -753,11 +678,10 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) 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){ + if (sdp->sd_log_head != sdp->sd_log_flush_head) { + log_write_header(sdp, 0, 0); + } 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);