![Steven Whitehouse](/assets/img/avatar_default.png)
Prior to this patch, we have two ways of sending i/o to the log. One of those is used when we need to allocate both the data to be written itself and also a buffer head to submit it. This is done via sb_getblk and friends. This is used mostly for writing log headers. The other method is used when writing blocks which have some in-place counterpart. This is the case for all the metadata blocks which are journalled, and when journaled data is in use, for unescaped journalled data blocks. This patch replaces both of those two methods, and about half a dozen separate i/o submission points with a single i/o submission function. We also go direct to bio rather than using buffer heads, since this allows us to build i/o requests of the maximum size for the block device in question. It also reduces the memory required for flushing the log, which can be very useful in low memory situations. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
246 lines
5.5 KiB
C
246 lines
5.5 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist_bl.h>
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#include <linux/atomic.h>
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#include <linux/mempool.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "super.h"
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#include "sys.h"
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#include "util.h"
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#include "glock.h"
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#include "quota.h"
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#include "recovery.h"
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#include "dir.h"
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struct workqueue_struct *gfs2_control_wq;
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static struct shrinker qd_shrinker = {
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.shrink = gfs2_shrink_qd_memory,
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.seeks = DEFAULT_SEEKS,
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};
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static void gfs2_init_inode_once(void *foo)
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{
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struct gfs2_inode *ip = foo;
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inode_init_once(&ip->i_inode);
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init_rwsem(&ip->i_rw_mutex);
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INIT_LIST_HEAD(&ip->i_trunc_list);
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ip->i_qadata = NULL;
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ip->i_res = NULL;
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ip->i_hash_cache = NULL;
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}
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static void gfs2_init_glock_once(void *foo)
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{
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struct gfs2_glock *gl = foo;
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INIT_HLIST_BL_NODE(&gl->gl_list);
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spin_lock_init(&gl->gl_spin);
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INIT_LIST_HEAD(&gl->gl_holders);
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INIT_LIST_HEAD(&gl->gl_lru);
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INIT_LIST_HEAD(&gl->gl_ail_list);
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atomic_set(&gl->gl_ail_count, 0);
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atomic_set(&gl->gl_revokes, 0);
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}
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static void gfs2_init_gl_aspace_once(void *foo)
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{
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struct gfs2_glock *gl = foo;
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struct address_space *mapping = (struct address_space *)(gl + 1);
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gfs2_init_glock_once(gl);
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address_space_init_once(mapping);
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}
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/**
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* init_gfs2_fs - Register GFS2 as a filesystem
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*
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* Returns: 0 on success, error code on failure
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*/
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static int __init init_gfs2_fs(void)
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{
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int error;
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gfs2_str2qstr(&gfs2_qdot, ".");
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gfs2_str2qstr(&gfs2_qdotdot, "..");
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error = gfs2_sys_init();
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if (error)
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return error;
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error = gfs2_glock_init();
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if (error)
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goto fail;
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error = -ENOMEM;
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gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
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sizeof(struct gfs2_glock),
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0, 0,
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gfs2_init_glock_once);
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if (!gfs2_glock_cachep)
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goto fail;
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gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
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sizeof(struct gfs2_glock) +
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sizeof(struct address_space),
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0, 0, gfs2_init_gl_aspace_once);
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if (!gfs2_glock_aspace_cachep)
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goto fail;
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gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
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sizeof(struct gfs2_inode),
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0, SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD,
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gfs2_init_inode_once);
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if (!gfs2_inode_cachep)
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goto fail;
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gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
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sizeof(struct gfs2_bufdata),
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0, 0, NULL);
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if (!gfs2_bufdata_cachep)
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goto fail;
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gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
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sizeof(struct gfs2_rgrpd),
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0, 0, NULL);
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if (!gfs2_rgrpd_cachep)
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goto fail;
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gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
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sizeof(struct gfs2_quota_data),
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0, 0, NULL);
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if (!gfs2_quotad_cachep)
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goto fail;
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gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
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sizeof(struct gfs2_blkreserv),
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0, 0, NULL);
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if (!gfs2_rsrv_cachep)
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goto fail;
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register_shrinker(&qd_shrinker);
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error = register_filesystem(&gfs2_fs_type);
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if (error)
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goto fail;
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error = register_filesystem(&gfs2meta_fs_type);
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if (error)
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goto fail_unregister;
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error = -ENOMEM;
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gfs_recovery_wq = alloc_workqueue("gfs_recovery",
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WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
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if (!gfs_recovery_wq)
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goto fail_wq;
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gfs2_control_wq = alloc_workqueue("gfs2_control",
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WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
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if (!gfs2_control_wq)
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goto fail_recovery;
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gfs2_page_pool = mempool_create_page_pool(64, 0);
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if (!gfs2_page_pool)
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goto fail_control;
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gfs2_register_debugfs();
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printk("GFS2 installed\n");
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return 0;
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fail_control:
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destroy_workqueue(gfs2_control_wq);
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fail_recovery:
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destroy_workqueue(gfs_recovery_wq);
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fail_wq:
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unregister_filesystem(&gfs2meta_fs_type);
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fail_unregister:
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unregister_filesystem(&gfs2_fs_type);
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fail:
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unregister_shrinker(&qd_shrinker);
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gfs2_glock_exit();
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if (gfs2_rsrv_cachep)
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kmem_cache_destroy(gfs2_rsrv_cachep);
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if (gfs2_quotad_cachep)
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kmem_cache_destroy(gfs2_quotad_cachep);
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if (gfs2_rgrpd_cachep)
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kmem_cache_destroy(gfs2_rgrpd_cachep);
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if (gfs2_bufdata_cachep)
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kmem_cache_destroy(gfs2_bufdata_cachep);
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if (gfs2_inode_cachep)
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kmem_cache_destroy(gfs2_inode_cachep);
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if (gfs2_glock_aspace_cachep)
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kmem_cache_destroy(gfs2_glock_aspace_cachep);
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if (gfs2_glock_cachep)
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kmem_cache_destroy(gfs2_glock_cachep);
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gfs2_sys_uninit();
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return error;
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}
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/**
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* exit_gfs2_fs - Unregister the file system
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*
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*/
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static void __exit exit_gfs2_fs(void)
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{
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unregister_shrinker(&qd_shrinker);
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gfs2_glock_exit();
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gfs2_unregister_debugfs();
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unregister_filesystem(&gfs2_fs_type);
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unregister_filesystem(&gfs2meta_fs_type);
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destroy_workqueue(gfs_recovery_wq);
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destroy_workqueue(gfs2_control_wq);
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rcu_barrier();
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mempool_destroy(gfs2_page_pool);
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kmem_cache_destroy(gfs2_rsrv_cachep);
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kmem_cache_destroy(gfs2_quotad_cachep);
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kmem_cache_destroy(gfs2_rgrpd_cachep);
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kmem_cache_destroy(gfs2_bufdata_cachep);
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kmem_cache_destroy(gfs2_inode_cachep);
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kmem_cache_destroy(gfs2_glock_aspace_cachep);
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kmem_cache_destroy(gfs2_glock_cachep);
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gfs2_sys_uninit();
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}
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MODULE_DESCRIPTION("Global File System");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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module_init(init_gfs2_fs);
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module_exit(exit_gfs2_fs);
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