From 6dbd822487d0a9f14432cb4680415b80656b63a2 Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Thu, 10 Jan 2008 15:18:55 +0000 Subject: [GFS2] Reduce inode size by moving i_alloc out of line It is possible to reduce the size of GFS2 inodes by taking the i_alloc structure out of the gfs2_inode. This patch allocates the i_alloc structure whenever its needed, and frees it afterward. This decreases the amount of low memory we use at the expense of requiring a memory allocation for each page or partial page that we write. A quick test with postmark shows that the overhead is not measurable and I also note that OCFS2 use the same approach. In the future I'd like to solve the problem by shrinking down the size of the members of the i_alloc structure, but for now, this reduces the immediate problem of using too much low-memory on x86 and doesn't add too much overhead. Signed-off-by: Steven Whitehouse --- fs/gfs2/bmap.c | 4 ++-- fs/gfs2/dir.c | 4 ++-- fs/gfs2/eattr.c | 2 +- fs/gfs2/incore.h | 2 +- fs/gfs2/inode.c | 7 ++++--- fs/gfs2/main.c | 1 + fs/gfs2/ops_address.c | 5 ++--- fs/gfs2/ops_file.c | 6 ++++-- fs/gfs2/ops_inode.c | 8 ++++---- fs/gfs2/quota.c | 12 ++++++------ fs/gfs2/rgrp.c | 20 +++++++++----------- fs/gfs2/rgrp.h | 4 +++- 12 files changed, 39 insertions(+), 36 deletions(-) (limited to 'fs') diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 22411416652..73dfad70de6 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -683,7 +683,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, if (metadata) revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; - error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); + error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh); if (error) return error; @@ -785,7 +785,7 @@ out_rg_gunlock: out_rlist: gfs2_rlist_free(&rlist); out: - gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); + gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh); return error; } diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index 9949bb746a5..57e2ed932ad 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -1876,7 +1876,7 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len, if (error) goto out; - error = gfs2_rindex_hold(sdp, &dip->i_alloc.al_ri_gh); + error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh); if (error) goto out_qs; @@ -1949,7 +1949,7 @@ out_rg_gunlock: gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); out_rlist: gfs2_rlist_free(&rlist); - gfs2_glock_dq_uninit(&dip->i_alloc.al_ri_gh); + gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh); out_qs: gfs2_quota_unhold(dip); out: diff --git a/fs/gfs2/eattr.c b/fs/gfs2/eattr.c index 2a7435b5c4d..bee99704ea1 100644 --- a/fs/gfs2/eattr.c +++ b/fs/gfs2/eattr.c @@ -1418,7 +1418,7 @@ out: static int ea_dealloc_block(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_rgrpd *rgd; struct buffer_head *dibh; int error; diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 745dada4085..4cdda1a3e12 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -264,7 +264,7 @@ struct gfs2_inode { struct gfs2_glock *i_gl; /* Move into i_gh? */ struct gfs2_holder i_iopen_gh; struct gfs2_holder i_gh; /* for prepare/commit_write only */ - struct gfs2_alloc i_alloc; + struct gfs2_alloc *i_alloc; u64 i_last_rg_alloc; spinlock_t i_spin; diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 53bca9978fb..c84764ad82b 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -711,9 +711,10 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); int error; - gfs2_alloc_get(dip); + if (gfs2_alloc_get(dip) == NULL) + return -ENOMEM; - dip->i_alloc.al_requested = RES_DINODE; + dip->i_alloc->al_requested = RES_DINODE; error = gfs2_inplace_reserve(dip); if (error) goto out; @@ -900,7 +901,7 @@ fail_end_trans: gfs2_trans_end(sdp); fail_ipreserv: - if (dip->i_alloc.al_rgd) + if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); fail_quota_locks: diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c index 653fd5a6203..88686fcdfb1 100644 --- a/fs/gfs2/main.c +++ b/fs/gfs2/main.c @@ -31,6 +31,7 @@ static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo) inode_init_once(&ip->i_inode); spin_lock_init(&ip->i_spin); init_rwsem(&ip->i_rw_mutex); + ip->i_alloc = NULL; } static void gfs2_init_glock_once(struct kmem_cache *cachep, void *foo) diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c index 37406a379e7..38dbe99a30e 100644 --- a/fs/gfs2/ops_address.c +++ b/fs/gfs2/ops_address.c @@ -646,7 +646,6 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping, if (error) goto out_unlock; - ip->i_alloc.al_requested = 0; if (alloc_required) { al = gfs2_alloc_get(ip); @@ -823,7 +822,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping, struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct buffer_head *dibh; - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_dinode *di; unsigned int from = pos & (PAGE_CACHE_SIZE - 1); unsigned int to = from + len; @@ -861,7 +860,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping, brelse(dibh); gfs2_trans_end(sdp); failed: - if (al->al_requested) { + if (al) { gfs2_inplace_release(ip); gfs2_quota_unlock(ip); gfs2_alloc_put(ip); diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c index 597f7ff2bc1..d7f4726ae0c 100644 --- a/fs/gfs2/ops_file.c +++ b/fs/gfs2/ops_file.c @@ -364,9 +364,11 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); if (ret || !alloc_required) goto out_unlock; - - ip->i_alloc.al_requested = 0; + ret = -ENOMEM; al = gfs2_alloc_get(ip); + if (al == NULL) + goto out_unlock; + ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (ret) goto out_alloc_put; diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c index 8386ab323e3..9f71372c175 100644 --- a/fs/gfs2/ops_inode.c +++ b/fs/gfs2/ops_inode.c @@ -61,7 +61,7 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry, inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); if (!IS_ERR(inode)) { gfs2_trans_end(sdp); - if (dip->i_alloc.al_rgd) + if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); @@ -376,7 +376,7 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry, } gfs2_trans_end(sdp); - if (dip->i_alloc.al_rgd) + if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); @@ -452,7 +452,7 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ gfs2_trans_end(sdp); - if (dip->i_alloc.al_rgd) + if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); @@ -558,7 +558,7 @@ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, } gfs2_trans_end(sdp); - if (dip->i_alloc.al_rgd) + if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c index 60cc50fe15b..a08dabd6ce9 100644 --- a/fs/gfs2/quota.c +++ b/fs/gfs2/quota.c @@ -453,7 +453,7 @@ static void qdsb_put(struct gfs2_quota_data *qd) int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data **qd = al->al_qd; int error; @@ -501,7 +501,7 @@ out: void gfs2_quota_unhold(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; unsigned int x; gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); @@ -853,7 +853,7 @@ fail: int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; unsigned int x; int error = 0; @@ -921,7 +921,7 @@ static int need_sync(struct gfs2_quota_data *qd) void gfs2_quota_unlock(struct gfs2_inode *ip) { - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qda[4]; unsigned int count = 0; unsigned int x; @@ -969,7 +969,7 @@ static int print_message(struct gfs2_quota_data *qd, char *type) int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qd; s64 value; unsigned int x; @@ -1013,7 +1013,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) void gfs2_quota_change(struct gfs2_inode *ip, s64 change, u32 uid, u32 gid) { - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qd; unsigned int x; diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 68c4bf363c4..3552110b2e5 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -819,11 +819,9 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd) struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip) { - struct gfs2_alloc *al = &ip->i_alloc; - - /* FIXME: Should assert that the correct locks are held here... */ - memset(al, 0, sizeof(*al)); - return al; + BUG_ON(ip->i_alloc != NULL); + ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_KERNEL); + return ip->i_alloc; } /** @@ -1061,7 +1059,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked) struct inode *inode = NULL; struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct gfs2_rgrpd *rgd, *begin = NULL; - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; int flags = LM_FLAG_TRY; int skipped = 0; int loops = 0; @@ -1176,7 +1174,7 @@ out: int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct inode *inode; int error = 0; u64 last_unlinked = NO_BLOCK; @@ -1222,7 +1220,7 @@ try_again: void gfs2_inplace_release(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1) fs_warn(sdp, "al_alloced = %u, al_requested = %u " @@ -1412,7 +1410,7 @@ static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart, u64 gfs2_alloc_data(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_rgrpd *rgd = al->al_rgd; u32 goal, blk; u64 block; @@ -1457,7 +1455,7 @@ u64 gfs2_alloc_data(struct gfs2_inode *ip) u64 gfs2_alloc_meta(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_rgrpd *rgd = al->al_rgd; u32 goal, blk; u64 block; @@ -1503,7 +1501,7 @@ u64 gfs2_alloc_meta(struct gfs2_inode *ip) u64 gfs2_alloc_di(struct gfs2_inode *dip, u64 *generation) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); - struct gfs2_alloc *al = &dip->i_alloc; + struct gfs2_alloc *al = dip->i_alloc; struct gfs2_rgrpd *rgd = al->al_rgd; u32 blk; u64 block; diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h index b4c6adfc6f2..149bb161f4b 100644 --- a/fs/gfs2/rgrp.h +++ b/fs/gfs2/rgrp.h @@ -32,7 +32,9 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd); struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip); static inline void gfs2_alloc_put(struct gfs2_inode *ip) { - return; /* So we can see where ip->i_alloc is used */ + BUG_ON(ip->i_alloc == NULL); + kfree(ip->i_alloc); + ip->i_alloc = NULL; } int gfs2_inplace_reserve_i(struct gfs2_inode *ip, -- cgit v1.2.3-70-g09d2