From 3cd6dbe6feb9b32347e6c6f25a27f0cde9d50418 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Mon, 30 Mar 2009 14:02:43 -0400 Subject: [PATCH] reiserfs: cleanup path functions This patch cleans up some redundancies in the reiserfs tree path code. decrement_bcount() is essentially the same function as brelse(), so we use that instead. decrement_counters_in_path() is exactly the same function as pathrelse(), so we kill that and use pathrelse() instead. There's also a bit of cleanup that makes the code a bit more readable. Signed-off-by: Jeff Mahoney Signed-off-by: Linus Torvalds --- fs/reiserfs/fix_node.c | 58 +++++++++++++++++++++-------------------- fs/reiserfs/stree.c | 59 ++++++++++-------------------------------- 2 files changed, 43 insertions(+), 74 deletions(-) diff --git a/fs/reiserfs/fix_node.c b/fs/reiserfs/fix_node.c index bbb37b0589a..aee50c97988 100644 --- a/fs/reiserfs/fix_node.c +++ b/fs/reiserfs/fix_node.c @@ -753,20 +753,21 @@ static void free_buffers_in_tb(struct tree_balance *p_s_tb) { int n_counter; - decrement_counters_in_path(p_s_tb->tb_path); + pathrelse(p_s_tb->tb_path); for (n_counter = 0; n_counter < MAX_HEIGHT; n_counter++) { - decrement_bcount(p_s_tb->L[n_counter]); + brelse(p_s_tb->L[n_counter]); + brelse(p_s_tb->R[n_counter]); + brelse(p_s_tb->FL[n_counter]); + brelse(p_s_tb->FR[n_counter]); + brelse(p_s_tb->CFL[n_counter]); + brelse(p_s_tb->CFR[n_counter]); + p_s_tb->L[n_counter] = NULL; - decrement_bcount(p_s_tb->R[n_counter]); p_s_tb->R[n_counter] = NULL; - decrement_bcount(p_s_tb->FL[n_counter]); p_s_tb->FL[n_counter] = NULL; - decrement_bcount(p_s_tb->FR[n_counter]); p_s_tb->FR[n_counter] = NULL; - decrement_bcount(p_s_tb->CFL[n_counter]); p_s_tb->CFL[n_counter] = NULL; - decrement_bcount(p_s_tb->CFR[n_counter]); p_s_tb->CFR[n_counter] = NULL; } } @@ -1022,7 +1023,7 @@ static int get_far_parent(struct tree_balance *p_s_tb, if (buffer_locked(*pp_s_com_father)) { __wait_on_buffer(*pp_s_com_father); if (FILESYSTEM_CHANGED_TB(p_s_tb)) { - decrement_bcount(*pp_s_com_father); + brelse(*pp_s_com_father); return REPEAT_SEARCH; } } @@ -1050,8 +1051,8 @@ static int get_far_parent(struct tree_balance *p_s_tb, return IO_ERROR; if (FILESYSTEM_CHANGED_TB(p_s_tb)) { - decrement_counters_in_path(&s_path_to_neighbor_father); - decrement_bcount(*pp_s_com_father); + pathrelse(&s_path_to_neighbor_father); + brelse(*pp_s_com_father); return REPEAT_SEARCH; } @@ -1063,7 +1064,7 @@ static int get_far_parent(struct tree_balance *p_s_tb, FIRST_PATH_ELEMENT_OFFSET, "PAP-8192: path length is too small"); s_path_to_neighbor_father.path_length--; - decrement_counters_in_path(&s_path_to_neighbor_father); + pathrelse(&s_path_to_neighbor_father); return CARRY_ON; } @@ -1086,10 +1087,10 @@ static int get_parents(struct tree_balance *p_s_tb, int n_h) if (n_path_offset <= FIRST_PATH_ELEMENT_OFFSET) { /* The root can not have parents. Release nodes which previously were obtained as parents of the current node neighbors. */ - decrement_bcount(p_s_tb->FL[n_h]); - decrement_bcount(p_s_tb->CFL[n_h]); - decrement_bcount(p_s_tb->FR[n_h]); - decrement_bcount(p_s_tb->CFR[n_h]); + brelse(p_s_tb->FL[n_h]); + brelse(p_s_tb->CFL[n_h]); + brelse(p_s_tb->FR[n_h]); + brelse(p_s_tb->CFR[n_h]); p_s_tb->FL[n_h] = p_s_tb->CFL[n_h] = p_s_tb->FR[n_h] = p_s_tb->CFR[n_h] = NULL; return CARRY_ON; @@ -1115,9 +1116,9 @@ static int get_parents(struct tree_balance *p_s_tb, int n_h) return n_ret_value; } - decrement_bcount(p_s_tb->FL[n_h]); + brelse(p_s_tb->FL[n_h]); p_s_tb->FL[n_h] = p_s_curf; /* New initialization of FL[n_h]. */ - decrement_bcount(p_s_tb->CFL[n_h]); + brelse(p_s_tb->CFL[n_h]); p_s_tb->CFL[n_h] = p_s_curcf; /* New initialization of CFL[n_h]. */ RFALSE((p_s_curf && !B_IS_IN_TREE(p_s_curf)) || @@ -1145,10 +1146,10 @@ static int get_parents(struct tree_balance *p_s_tb, int n_h) p_s_tb->rkey[n_h] = n_position; } - decrement_bcount(p_s_tb->FR[n_h]); + brelse(p_s_tb->FR[n_h]); p_s_tb->FR[n_h] = p_s_curf; /* New initialization of FR[n_path_offset]. */ - decrement_bcount(p_s_tb->CFR[n_h]); + brelse(p_s_tb->CFR[n_h]); p_s_tb->CFR[n_h] = p_s_curcf; /* New initialization of CFR[n_path_offset]. */ RFALSE((p_s_curf && !B_IS_IN_TREE(p_s_curf)) || @@ -1964,7 +1965,7 @@ static int get_neighbors(struct tree_balance *p_s_tb, int n_h) if (!p_s_bh) return IO_ERROR; if (FILESYSTEM_CHANGED_TB(p_s_tb)) { - decrement_bcount(p_s_bh); + brelse(p_s_bh); PROC_INFO_INC(p_s_sb, get_neighbors_restart[n_h]); return REPEAT_SEARCH; } @@ -1980,7 +1981,7 @@ static int get_neighbors(struct tree_balance *p_s_tb, int n_h) dc_size(B_N_CHILD(p_s_tb->FL[0], n_child_position)), "PAP-8290: invalid child size of left neighbor"); - decrement_bcount(p_s_tb->L[n_h]); + brelse(p_s_tb->L[n_h]); p_s_tb->L[n_h] = p_s_bh; } @@ -2001,11 +2002,11 @@ static int get_neighbors(struct tree_balance *p_s_tb, int n_h) if (!p_s_bh) return IO_ERROR; if (FILESYSTEM_CHANGED_TB(p_s_tb)) { - decrement_bcount(p_s_bh); + brelse(p_s_bh); PROC_INFO_INC(p_s_sb, get_neighbors_restart[n_h]); return REPEAT_SEARCH; } - decrement_bcount(p_s_tb->R[n_h]); + brelse(p_s_tb->R[n_h]); p_s_tb->R[n_h] = p_s_bh; RFALSE(!n_h @@ -2511,16 +2512,17 @@ int fix_nodes(int n_op_mode, struct tree_balance *p_s_tb, struct item_head *p_s_ } brelse(p_s_tb->L[i]); - p_s_tb->L[i] = NULL; brelse(p_s_tb->R[i]); - p_s_tb->R[i] = NULL; brelse(p_s_tb->FL[i]); - p_s_tb->FL[i] = NULL; brelse(p_s_tb->FR[i]); - p_s_tb->FR[i] = NULL; brelse(p_s_tb->CFL[i]); - p_s_tb->CFL[i] = NULL; brelse(p_s_tb->CFR[i]); + + p_s_tb->L[i] = NULL; + p_s_tb->R[i] = NULL; + p_s_tb->FL[i] = NULL; + p_s_tb->FR[i] = NULL; + p_s_tb->CFL[i] = NULL; p_s_tb->CFR[i] = NULL; } diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c index ec837a250a4..b2eaa0c6b7b 100644 --- a/fs/reiserfs/stree.c +++ b/fs/reiserfs/stree.c @@ -23,7 +23,6 @@ * get_rkey * key_in_buffer * decrement_bcount - * decrement_counters_in_path * reiserfs_check_path * pathrelse_and_restore * pathrelse @@ -359,36 +358,6 @@ static inline int key_in_buffer(struct treepath *p_s_chk_path, /* Path which sho return 1; } -inline void decrement_bcount(struct buffer_head *p_s_bh) -{ - if (p_s_bh) { - if (atomic_read(&(p_s_bh->b_count))) { - put_bh(p_s_bh); - return; - } - reiserfs_panic(NULL, "PAP-5070", - "trying to free free buffer %b", p_s_bh); - } -} - -/* Decrement b_count field of the all buffers in the path. */ -void decrement_counters_in_path(struct treepath *p_s_search_path) -{ - int n_path_offset = p_s_search_path->path_length; - - RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET || - n_path_offset > EXTENDED_MAX_HEIGHT - 1, - "PAP-5080: invalid path offset of %d", n_path_offset); - - while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) { - struct buffer_head *bh; - - bh = PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--); - decrement_bcount(bh); - } - p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; -} - int reiserfs_check_path(struct treepath *p) { RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET, @@ -396,12 +365,11 @@ int reiserfs_check_path(struct treepath *p) return 0; } -/* Release all buffers in the path. Restore dirty bits clean -** when preparing the buffer for the log -** -** only called from fix_nodes() -*/ -void pathrelse_and_restore(struct super_block *s, struct treepath *p_s_search_path) +/* Drop the reference to each buffer in a path and restore + * dirty bits clean when preparing the buffer for the log. + * This version should only be called from fix_nodes() */ +void pathrelse_and_restore(struct super_block *sb, + struct treepath *p_s_search_path) { int n_path_offset = p_s_search_path->path_length; @@ -409,16 +377,15 @@ void pathrelse_and_restore(struct super_block *s, struct treepath *p_s_search_pa "clm-4000: invalid path offset"); while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) { - reiserfs_restore_prepared_buffer(s, - PATH_OFFSET_PBUFFER - (p_s_search_path, - n_path_offset)); - brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--)); + struct buffer_head *bh; + bh = PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--); + reiserfs_restore_prepared_buffer(sb, bh); + brelse(bh); } p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; } -/* Release all buffers in the path. */ +/* Drop the reference to each buffer in a path */ void pathrelse(struct treepath *p_s_search_path) { int n_path_offset = p_s_search_path->path_length; @@ -631,7 +598,7 @@ int search_by_key(struct super_block *p_s_sb, const struct cpu_key *p_s_key, /* we must be careful to release all nodes in a path before we either discard the path struct or re-use the path struct, as we do here. */ - decrement_counters_in_path(p_s_search_path); + pathrelse(p_s_search_path); right_neighbor_of_leaf_node = 0; @@ -691,7 +658,7 @@ int search_by_key(struct super_block *p_s_sb, const struct cpu_key *p_s_key, /* PROC_INFO_INC(p_s_sb, search_by_key_restarted); PROC_INFO_INC(p_s_sb, sbk_restarted[expected_level - 1]); - decrement_counters_in_path(p_s_search_path); + pathrelse(p_s_search_path); /* Get the root block number so that we can repeat the search starting from the root. */ @@ -1868,7 +1835,7 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, struct inode *p if (journal_transaction_should_end(th, 0) || reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) { int orig_len_alloc = th->t_blocks_allocated; - decrement_counters_in_path(&s_search_path); + pathrelse(&s_search_path); if (update_timestamps) { p_s_inode->i_mtime = p_s_inode->i_ctime = -- 2.41.1