From 28a89567b8bd95f42c17822d276cccb5b085810d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Wed, 3 Aug 2016 11:10:55 +1000 Subject: [PATCH] xfs: refactor btree owner change into a separate visit-blocks function Refactor the btree_change_owner function into a more generic apparatus which visits all blocks in a btree. We'll use this in a subsequent patch for counting btree blocks for AG reservations. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster Reviewed-by: Christoph Hellwig Signed-off-by: Dave Chinner --- fs/xfs/libxfs/xfs_btree.c | 141 ++++++++++++++++++++++++-------------- fs/xfs/libxfs/xfs_btree.h | 5 ++ 2 files changed, 96 insertions(+), 50 deletions(-) diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index d79dcb08ed18..b5be7f41c856 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -4328,6 +4328,81 @@ xfs_btree_get_rec( return 0; } +/* Visit a block in a btree. */ +STATIC int +xfs_btree_visit_block( + struct xfs_btree_cur *cur, + int level, + xfs_btree_visit_blocks_fn fn, + void *data) +{ + struct xfs_btree_block *block; + struct xfs_buf *bp; + union xfs_btree_ptr rptr; + int error; + + /* do right sibling readahead */ + xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA); + block = xfs_btree_get_block(cur, level, &bp); + + /* process the block */ + error = fn(cur, level, data); + if (error) + return error; + + /* now read rh sibling block for next iteration */ + xfs_btree_get_sibling(cur, block, &rptr, XFS_BB_RIGHTSIB); + if (xfs_btree_ptr_is_null(cur, &rptr)) + return -ENOENT; + + return xfs_btree_lookup_get_block(cur, level, &rptr, &block); +} + + +/* Visit every block in a btree. */ +int +xfs_btree_visit_blocks( + struct xfs_btree_cur *cur, + xfs_btree_visit_blocks_fn fn, + void *data) +{ + union xfs_btree_ptr lptr; + int level; + struct xfs_btree_block *block = NULL; + int error = 0; + + cur->bc_ops->init_ptr_from_cur(cur, &lptr); + + /* for each level */ + for (level = cur->bc_nlevels - 1; level >= 0; level--) { + /* grab the left hand block */ + error = xfs_btree_lookup_get_block(cur, level, &lptr, &block); + if (error) + return error; + + /* readahead the left most block for the next level down */ + if (level > 0) { + union xfs_btree_ptr *ptr; + + ptr = xfs_btree_ptr_addr(cur, 1, block); + xfs_btree_readahead_ptr(cur, ptr, 1); + + /* save for the next iteration of the loop */ + lptr = *ptr; + } + + /* for each buffer in the level */ + do { + error = xfs_btree_visit_block(cur, level, fn, data); + } while (!error); + + if (error != -ENOENT) + return error; + } + + return 0; +} + /* * Change the owner of a btree. * @@ -4352,26 +4427,27 @@ xfs_btree_get_rec( * just queue the modified buffer as delayed write buffer so the transaction * recovery completion writes the changes to disk. */ +struct xfs_btree_block_change_owner_info { + __uint64_t new_owner; + struct list_head *buffer_list; +}; + static int xfs_btree_block_change_owner( struct xfs_btree_cur *cur, int level, - __uint64_t new_owner, - struct list_head *buffer_list) + void *data) { + struct xfs_btree_block_change_owner_info *bbcoi = data; struct xfs_btree_block *block; struct xfs_buf *bp; - union xfs_btree_ptr rptr; - - /* do right sibling readahead */ - xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA); /* modify the owner */ block = xfs_btree_get_block(cur, level, &bp); if (cur->bc_flags & XFS_BTREE_LONG_PTRS) - block->bb_u.l.bb_owner = cpu_to_be64(new_owner); + block->bb_u.l.bb_owner = cpu_to_be64(bbcoi->new_owner); else - block->bb_u.s.bb_owner = cpu_to_be32(new_owner); + block->bb_u.s.bb_owner = cpu_to_be32(bbcoi->new_owner); /* * If the block is a root block hosted in an inode, we might not have a @@ -4385,19 +4461,14 @@ xfs_btree_block_change_owner( xfs_trans_ordered_buf(cur->bc_tp, bp); xfs_btree_log_block(cur, bp, XFS_BB_OWNER); } else { - xfs_buf_delwri_queue(bp, buffer_list); + xfs_buf_delwri_queue(bp, bbcoi->buffer_list); } } else { ASSERT(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE); ASSERT(level == cur->bc_nlevels - 1); } - /* now read rh sibling block for next iteration */ - xfs_btree_get_sibling(cur, block, &rptr, XFS_BB_RIGHTSIB); - if (xfs_btree_ptr_is_null(cur, &rptr)) - return -ENOENT; - - return xfs_btree_lookup_get_block(cur, level, &rptr, &block); + return 0; } int @@ -4406,43 +4477,13 @@ xfs_btree_change_owner( __uint64_t new_owner, struct list_head *buffer_list) { - union xfs_btree_ptr lptr; - int level; - struct xfs_btree_block *block = NULL; - int error = 0; + struct xfs_btree_block_change_owner_info bbcoi; - cur->bc_ops->init_ptr_from_cur(cur, &lptr); + bbcoi.new_owner = new_owner; + bbcoi.buffer_list = buffer_list; - /* for each level */ - for (level = cur->bc_nlevels - 1; level >= 0; level--) { - /* grab the left hand block */ - error = xfs_btree_lookup_get_block(cur, level, &lptr, &block); - if (error) - return error; - - /* readahead the left most block for the next level down */ - if (level > 0) { - union xfs_btree_ptr *ptr; - - ptr = xfs_btree_ptr_addr(cur, 1, block); - xfs_btree_readahead_ptr(cur, ptr, 1); - - /* save for the next iteration of the loop */ - lptr = *ptr; - } - - /* for each buffer in the level */ - do { - error = xfs_btree_block_change_owner(cur, level, - new_owner, - buffer_list); - } while (!error); - - if (error != -ENOENT) - return error; - } - - return 0; + return xfs_btree_visit_blocks(cur, xfs_btree_block_change_owner, + &bbcoi); } /** diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h index 34c13616d255..69f564029f56 100644 --- a/fs/xfs/libxfs/xfs_btree.h +++ b/fs/xfs/libxfs/xfs_btree.h @@ -536,4 +536,9 @@ int xfs_btree_query_range(struct xfs_btree_cur *cur, union xfs_btree_irec *low_rec, union xfs_btree_irec *high_rec, xfs_btree_query_range_fn fn, void *priv); +typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level, + void *data); +int xfs_btree_visit_blocks(struct xfs_btree_cur *cur, + xfs_btree_visit_blocks_fn fn, void *data); + #endif /* __XFS_BTREE_H__ */ -- 2.20.1