From 3c5d785acfda7dffa63477951bb6864c6a49ed2e Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Mon, 14 Nov 2011 11:17:08 -0500 Subject: GFS2: combine gfs2_alloc_block and gfs2_alloc_di GFS2 functions gfs2_alloc_block and gfs2_alloc_di do basically the same things, with a few exceptions. This patch combines the two functions into a slightly more generic gfs2_alloc_block. Having one centralized block allocation function will reduce code redundancy and make it easier to implement multi-block reservations to reduce file fragmentation in the future. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse --- fs/gfs2/rgrp.c | 104 ++++++++++++++++++++------------------------------------- 1 file changed, 36 insertions(+), 68 deletions(-) (limited to 'fs/gfs2/rgrp.c') diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index a1a815b691c..995f4e67448 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -1304,19 +1304,24 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd) * @ip: the inode to allocate the block for * @bn: Used to return the starting block number * @n: requested number of blocks/extent length (value/result) + * dinode: 1 if we're allocating a dinode, 0 if it's a data block + * @generation: the generation number of the inode * * Returns: 0 or error */ -int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n) +int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n, + int dinode, u64 *generation) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct buffer_head *dibh; struct gfs2_alloc *al = ip->i_alloc; struct gfs2_rgrpd *rgd; - u32 goal, blk; - u64 block; + u32 goal, blk; /* block, within the rgrp scope */ + u64 block; /* block, within the file system scope */ + unsigned int extn = 1; int error; + unsigned char blk_type = dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED; /* Only happens if there is a bug in gfs2, return something distinctive * to ensure that it is noticed. @@ -1324,14 +1329,16 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n) if (al == NULL) return -ECANCELED; + if (n == NULL) + n = &extn; rgd = ip->i_rgd; - if (rgrp_contains_block(rgd, ip->i_goal)) + if (!dinode && rgrp_contains_block(rgd, ip->i_goal)) goal = ip->i_goal - rgd->rd_data0; else goal = rgd->rd_last_alloc; - blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n); + blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, blk_type, n); /* Since all blocks are reserved in advance, this shouldn't happen */ if (blk == BFITNOENT) @@ -1339,82 +1346,43 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n) rgd->rd_last_alloc = blk; block = rgd->rd_data0 + blk; - ip->i_goal = block + *n - 1; - error = gfs2_meta_inode_buffer(ip, &dibh); - if (error == 0) { - struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; - gfs2_trans_add_bh(ip->i_gl, dibh, 1); - di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal); - brelse(dibh); + if (!dinode) { + ip->i_goal = block + *n - 1; + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error == 0) { + struct gfs2_dinode *di = + (struct gfs2_dinode *)dibh->b_data; + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + di->di_goal_meta = di->di_goal_data = + cpu_to_be64(ip->i_goal); + brelse(dibh); + } } if (rgd->rd_free < *n) goto rgrp_error; rgd->rd_free -= *n; + if (dinode) { + rgd->rd_dinodes++; + *generation = rgd->rd_igeneration++; + if (*generation == 0) + *generation = rgd->rd_igeneration++; + } gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1); gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data); al->al_alloced += *n; - gfs2_statfs_change(sdp, 0, -(s64)*n, 0); - gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid); + gfs2_statfs_change(sdp, 0, -(s64)*n, dinode ? 1 : 0); + if (dinode) + gfs2_trans_add_unrevoke(sdp, block, 1); + else + gfs2_quota_change(ip, *n, ip->i_inode.i_uid, + ip->i_inode.i_gid); rgd->rd_free_clone -= *n; - trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED); - *bn = block; - return 0; - -rgrp_error: - gfs2_rgrp_error(rgd); - return -EIO; -} - -/** - * gfs2_alloc_di - Allocate a dinode - * @dip: the directory that the inode is going in - * @bn: the block number which is allocated - * @generation: the generation number of the inode - * - * Returns: 0 on success or error - */ - -int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation) -{ - struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); - struct gfs2_alloc *al = dip->i_alloc; - struct gfs2_rgrpd *rgd = dip->i_rgd; - u32 blk; - u64 block; - unsigned int n = 1; - - blk = rgblk_search(rgd, rgd->rd_last_alloc, - GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n); - - /* Since all blocks are reserved in advance, this shouldn't happen */ - if (blk == BFITNOENT) - goto rgrp_error; - - rgd->rd_last_alloc = blk; - block = rgd->rd_data0 + blk; - if (rgd->rd_free == 0) - goto rgrp_error; - - rgd->rd_free--; - rgd->rd_dinodes++; - *generation = rgd->rd_igeneration++; - if (*generation == 0) - *generation = rgd->rd_igeneration++; - gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1); - gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data); - - al->al_alloced++; - - gfs2_statfs_change(sdp, 0, -1, +1); - gfs2_trans_add_unrevoke(sdp, block, 1); - - rgd->rd_free_clone--; - trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE); + trace_gfs2_block_alloc(ip, block, *n, blk_type); *bn = block; return 0; -- cgit v1.2.3