From 8d8291ae93ecb4a246e87e452d55cca412373300 Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Thu, 27 Aug 2009 15:51:07 +0100 Subject: GFS2: Remove no_formal_ino generating code The inum structure used throughout GFS2 has two fields. One no_addr is the disk block number of the inode in question and is used everywhere as the inode number. The other, no_formal_ino, is used only as the generation number for NFS. Historically the no_formal_ino field was set using a complicated system of one global and one per-node file containing inode numbers in order to ensure that each no_formal_ino was unique. Also this code made no provision for what would happen when eventually the (64 bit) numbers ran out. Now I know that is pretty unlikely to happen given the large space of numbers, but it is possible nevertheless. The only guarantee required for no_formal_ino is that, for any single inode, the same number doesn't get reused too quickly. We already have a generation number which is kept in the inode and initialised from a counter in the resource group (almost no overhead, since we have to touch the resource group anyway in order to allocate an inode in the first place). Aside from ensuring that we never use the value 0 in the no_formal_ino field, we can use that counter directly. As a result of that change, we lose about 200 lines of code and also gain about 10 creates/sec on the postmark benchmark (on my test machine). Signed-off-by: Steven Whitehouse --- fs/gfs2/inode.c | 143 ++------------------------------------------------------ 1 file changed, 3 insertions(+), 140 deletions(-) (limited to 'fs/gfs2/inode.c') diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 4f5e442d60d8..fb15d3b1f409 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -519,139 +519,6 @@ out: return inode ? inode : ERR_PTR(error); } -static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf) -{ - const struct gfs2_inum_range *str = buf; - - ir->ir_start = be64_to_cpu(str->ir_start); - ir->ir_length = be64_to_cpu(str->ir_length); -} - -static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf) -{ - struct gfs2_inum_range *str = buf; - - str->ir_start = cpu_to_be64(ir->ir_start); - str->ir_length = cpu_to_be64(ir->ir_length); -} - -static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) -{ - struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); - struct buffer_head *bh; - struct gfs2_inum_range_host ir; - int error; - - error = gfs2_trans_begin(sdp, RES_DINODE, 0); - if (error) - return error; - mutex_lock(&sdp->sd_inum_mutex); - - error = gfs2_meta_inode_buffer(ip, &bh); - if (error) { - mutex_unlock(&sdp->sd_inum_mutex); - gfs2_trans_end(sdp); - return error; - } - - gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); - - if (ir.ir_length) { - *formal_ino = ir.ir_start++; - ir.ir_length--; - gfs2_trans_add_bh(ip->i_gl, bh, 1); - gfs2_inum_range_out(&ir, - bh->b_data + sizeof(struct gfs2_dinode)); - brelse(bh); - mutex_unlock(&sdp->sd_inum_mutex); - gfs2_trans_end(sdp); - return 0; - } - - brelse(bh); - - mutex_unlock(&sdp->sd_inum_mutex); - gfs2_trans_end(sdp); - - return 1; -} - -static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) -{ - struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); - struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); - struct gfs2_holder gh; - struct buffer_head *bh; - struct gfs2_inum_range_host ir; - int error; - - error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); - if (error) - return error; - - error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); - if (error) - goto out; - mutex_lock(&sdp->sd_inum_mutex); - - error = gfs2_meta_inode_buffer(ip, &bh); - if (error) - goto out_end_trans; - - gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); - - if (!ir.ir_length) { - struct buffer_head *m_bh; - u64 x, y; - __be64 z; - - error = gfs2_meta_inode_buffer(m_ip, &m_bh); - if (error) - goto out_brelse; - - z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); - x = y = be64_to_cpu(z); - ir.ir_start = x; - ir.ir_length = GFS2_INUM_QUANTUM; - x += GFS2_INUM_QUANTUM; - if (x < y) - gfs2_consist_inode(m_ip); - z = cpu_to_be64(x); - gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); - *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; - - brelse(m_bh); - } - - *formal_ino = ir.ir_start++; - ir.ir_length--; - - gfs2_trans_add_bh(ip->i_gl, bh, 1); - gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); - -out_brelse: - brelse(bh); -out_end_trans: - mutex_unlock(&sdp->sd_inum_mutex); - gfs2_trans_end(sdp); -out: - gfs2_glock_dq_uninit(&gh); - return error; -} - -static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) -{ - int error; - - error = pick_formal_ino_1(sdp, inum); - if (error <= 0) - return error; - - error = pick_formal_ino_2(sdp, inum); - - return error; -} - /** * create_ok - OK to create a new on-disk inode here? * @dip: Directory in which dinode is to be created @@ -981,13 +848,10 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, if (error) goto fail_gunlock; - error = pick_formal_ino(sdp, &inum.no_formal_ino); - if (error) - goto fail_gunlock; - error = alloc_dinode(dip, &inum.no_addr, &generation); if (error) goto fail_gunlock; + inum.no_formal_ino = generation; error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); @@ -998,9 +862,8 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, if (error) goto fail_gunlock2; - inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), - inum.no_addr, - inum.no_formal_ino, 0); + inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, + inum.no_formal_ino, 0); if (IS_ERR(inode)) goto fail_gunlock2; -- cgit v1.2.3