/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License v.2.
+ * of the GNU General Public License version 2.
*/
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
-#include <linux/vmalloc.h>
#include <linux/statfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/kthread.h>
#include <linux/delay.h>
-#include <asm/semaphore.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/lm_interface.h>
+#include <linux/time.h>
#include "gfs2.h"
+#include "incore.h"
#include "glock.h"
#include "inode.h"
-#include "lm.h"
#include "log.h"
#include "mount.h"
-#include "ops_super.h"
-#include "page.h"
#include "quota.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
+#include "util.h"
+#include "trans.h"
+#include "dir.h"
+#include "eattr.h"
+#include "bmap.h"
+#include "meta_io.h"
/**
* gfs2_write_inode - Make sure the inode is stable on the disk
static int gfs2_write_inode(struct inode *inode, int sync)
{
- struct gfs2_inode *ip = get_v2ip(inode);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct gfs2_holder gh;
+ struct buffer_head *bh;
+ struct timespec atime;
+ struct gfs2_dinode *di;
+ int ret = 0;
+
+ /* Check this is a "normal" inode, etc */
+ if (!test_bit(GIF_USER, &ip->i_flags) ||
+ (current->flags & PF_MEMALLOC))
+ return 0;
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (ret)
+ goto do_flush;
+ ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (ret)
+ goto do_unlock;
+ ret = gfs2_meta_inode_buffer(ip, &bh);
+ if (ret == 0) {
+ di = (struct gfs2_dinode *)bh->b_data;
+ atime.tv_sec = be64_to_cpu(di->di_atime);
+ atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
+ if (timespec_compare(&inode->i_atime, &atime) > 0) {
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_dinode_out(ip, bh->b_data);
+ }
+ brelse(bh);
+ }
+ gfs2_trans_end(sdp);
+do_unlock:
+ gfs2_glock_dq_uninit(&gh);
+do_flush:
+ if (sync != 0)
+ gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
+ return ret;
+}
- atomic_inc(&ip->i_sbd->sd_ops_super);
+/**
+ * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
+ * @sdp: the filesystem
+ *
+ * Returns: errno
+ */
- if (current->flags & PF_MEMALLOC)
- return 0;
- if (ip && sync)
- gfs2_log_flush_glock(ip->i_gl);
+static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
+{
+ struct gfs2_holder t_gh;
+ int error;
- return 0;
+ gfs2_quota_sync(sdp);
+ gfs2_statfs_sync(sdp);
+
+ error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
+ &t_gh);
+ if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
+ return error;
+
+ gfs2_meta_syncfs(sdp);
+ gfs2_log_shutdown(sdp);
+
+ clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
+
+ if (t_gh.gh_gl)
+ gfs2_glock_dq_uninit(&t_gh);
+
+ gfs2_quota_cleanup(sdp);
+
+ return error;
}
/**
static void gfs2_put_super(struct super_block *sb)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
+ struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
- if (!sdp)
- return;
-
- atomic_inc(&sdp->sd_ops_super);
-
/* Unfreeze the filesystem, if we need to */
mutex_lock(&sdp->sd_freeze_lock);
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
mutex_unlock(&sdp->sd_freeze_lock);
- kthread_stop(sdp->sd_inoded_process);
kthread_stop(sdp->sd_quotad_process);
kthread_stop(sdp->sd_logd_process);
kthread_stop(sdp->sd_recoverd_process);
- while (sdp->sd_glockd_num--)
- kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
- kthread_stop(sdp->sd_scand_process);
if (!(sb->s_flags & MS_RDONLY)) {
error = gfs2_make_fs_ro(sdp);
if (error)
gfs2_io_error(sdp);
}
-
/* At this point, we're through modifying the disk */
/* Release stuff */
- iput(sdp->sd_master_dir);
iput(sdp->sd_jindex);
iput(sdp->sd_inum_inode);
iput(sdp->sd_statfs_inode);
iput(sdp->sd_rindex);
iput(sdp->sd_quota_inode);
- iput(sdp->sd_root_dir);
gfs2_glock_put(sdp->sd_rename_gl);
gfs2_glock_put(sdp->sd_trans_gl);
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
- gfs2_glock_dq_uninit(&sdp->sd_ut_gh);
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
iput(sdp->sd_ir_inode);
iput(sdp->sd_sc_inode);
- iput(sdp->sd_ut_inode);
iput(sdp->sd_qc_inode);
}
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
-
gfs2_clear_rgrpd(sdp);
gfs2_jindex_free(sdp);
-
/* Take apart glock structures and buffer lists */
- gfs2_gl_hash_clear(sdp, WAIT);
-
+ gfs2_gl_hash_clear(sdp);
/* Unmount the locking protocol */
gfs2_lm_unmount(sdp);
/* At this point, we're through participating in the lockspace */
-
gfs2_sys_fs_del(sdp);
+}
- /* Get rid of any extra inodes */
- while (invalidate_inodes(sb))
- yield();
-
- vfree(sdp);
+/**
+ * gfs2_write_super
+ * @sb: the superblock
+ *
+ */
- set_v2sdp(sb, NULL);
+static void gfs2_write_super(struct super_block *sb)
+{
+ sb->s_dirt = 0;
}
/**
- * gfs2_write_super - disk commit all incore transactions
- * @sb: the filesystem
+ * gfs2_sync_fs - sync the filesystem
+ * @sb: the superblock
*
- * This function is called every time sync(2) is called.
- * After this exits, all dirty buffers and synced.
+ * Flushes the log to disk.
*/
-static void gfs2_write_super(struct super_block *sb)
+static int gfs2_sync_fs(struct super_block *sb, int wait)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
- atomic_inc(&sdp->sd_ops_super);
- gfs2_log_flush(sdp);
+ sb->s_dirt = 0;
+ if (wait && sb->s_fs_info)
+ gfs2_log_flush(sb->s_fs_info, NULL);
+ return 0;
}
/**
- * gfs2_write_super_lockfs - prevent further writes to the filesystem
+ * gfs2_freeze - prevent further writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
-static void gfs2_write_super_lockfs(struct super_block *sb)
+static int gfs2_freeze(struct super_block *sb)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
+ struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
- atomic_inc(&sdp->sd_ops_super);
+ if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
+ return -EINVAL;
for (;;) {
error = gfs2_freeze_fs(sdp);
fs_err(sdp, "retrying...\n");
msleep(1000);
}
+ return 0;
}
/**
- * gfs2_unlockfs - reallow writes to the filesystem
+ * gfs2_unfreeze - reallow writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
-static void gfs2_unlockfs(struct super_block *sb)
+static int gfs2_unfreeze(struct super_block *sb)
+{
+ gfs2_unfreeze_fs(sb->s_fs_info);
+ return 0;
+}
+
+/**
+ * statfs_fill - fill in the sg for a given RG
+ * @rgd: the RG
+ * @sc: the sc structure
+ *
+ * Returns: 0 on success, -ESTALE if the LVB is invalid
+ */
+
+static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
+ struct gfs2_statfs_change_host *sc)
+{
+ gfs2_rgrp_verify(rgd);
+ sc->sc_total += rgd->rd_data;
+ sc->sc_free += rgd->rd_free;
+ sc->sc_dinodes += rgd->rd_dinodes;
+ return 0;
+}
+
+/**
+ * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
+ * @sdp: the filesystem
+ * @sc: the sc info that will be returned
+ *
+ * Any error (other than a signal) will cause this routine to fall back
+ * to the synchronous version.
+ *
+ * FIXME: This really shouldn't busy wait like this.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
+{
+ struct gfs2_holder ri_gh;
+ struct gfs2_rgrpd *rgd_next;
+ struct gfs2_holder *gha, *gh;
+ unsigned int slots = 64;
+ unsigned int x;
+ int done;
+ int error = 0, err;
+
+ memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
+ gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
+ if (!gha)
+ return -ENOMEM;
+
+ error = gfs2_rindex_hold(sdp, &ri_gh);
+ if (error)
+ goto out;
+
+ rgd_next = gfs2_rgrpd_get_first(sdp);
+
+ for (;;) {
+ done = 1;
+
+ for (x = 0; x < slots; x++) {
+ gh = gha + x;
+
+ if (gh->gh_gl && gfs2_glock_poll(gh)) {
+ err = gfs2_glock_wait(gh);
+ if (err) {
+ gfs2_holder_uninit(gh);
+ error = err;
+ } else {
+ if (!error)
+ error = statfs_slow_fill(
+ gh->gh_gl->gl_object, sc);
+ gfs2_glock_dq_uninit(gh);
+ }
+ }
+
+ if (gh->gh_gl)
+ done = 0;
+ else if (rgd_next && !error) {
+ error = gfs2_glock_nq_init(rgd_next->rd_gl,
+ LM_ST_SHARED,
+ GL_ASYNC,
+ gh);
+ rgd_next = gfs2_rgrpd_get_next(rgd_next);
+ done = 0;
+ }
+
+ if (signal_pending(current))
+ error = -ERESTARTSYS;
+ }
+
+ if (done)
+ break;
+
+ yield();
+ }
+
+ gfs2_glock_dq_uninit(&ri_gh);
+
+out:
+ kfree(gha);
+ return error;
+}
+
+/**
+ * gfs2_statfs_i - Do a statfs
+ * @sdp: the filesystem
+ * @sg: the sg structure
+ *
+ * Returns: errno
+ */
+
+static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
+ struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
+ struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
+
+ spin_lock(&sdp->sd_statfs_spin);
- atomic_inc(&sdp->sd_ops_super);
- gfs2_unfreeze_fs(sdp);
+ *sc = *m_sc;
+ sc->sc_total += l_sc->sc_total;
+ sc->sc_free += l_sc->sc_free;
+ sc->sc_dinodes += l_sc->sc_dinodes;
+
+ spin_unlock(&sdp->sd_statfs_spin);
+
+ if (sc->sc_free < 0)
+ sc->sc_free = 0;
+ if (sc->sc_free > sc->sc_total)
+ sc->sc_free = sc->sc_total;
+ if (sc->sc_dinodes < 0)
+ sc->sc_dinodes = 0;
+
+ return 0;
}
/**
* Returns: 0 on success or error code
*/
-static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf)
+static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
- struct gfs2_statfs_change sc;
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_statfs_change_host sc;
int error;
- atomic_inc(&sdp->sd_ops_super);
-
if (gfs2_tune_get(sdp, gt_statfs_slow))
error = gfs2_statfs_slow(sdp, &sc);
else
if (error)
return error;
- memset(buf, 0, sizeof(struct kstatfs));
-
buf->f_type = GFS2_MAGIC;
buf->f_bsize = sdp->sd_sb.sb_bsize;
buf->f_blocks = sc.sc_total;
static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
- struct gfs2_sbd *sdp = get_v2sdp(sb);
+ struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
- atomic_inc(&sdp->sd_ops_super);
-
error = gfs2_mount_args(sdp, data, 1);
if (error)
return error;
}
}
- if (*flags & (MS_NOATIME | MS_NODIRATIME))
- set_bit(SDF_NOATIME, &sdp->sd_flags);
- else
- clear_bit(SDF_NOATIME, &sdp->sd_flags);
+ return error;
+}
- /* Don't let the VFS update atimes. GFS2 handles this itself. */
- *flags |= MS_NOATIME | MS_NODIRATIME;
+/**
+ * gfs2_drop_inode - Drop an inode (test for remote unlink)
+ * @inode: The inode to drop
+ *
+ * If we've received a callback on an iopen lock then its because a
+ * remote node tried to deallocate the inode but failed due to this node
+ * still having the inode open. Here we mark the link count zero
+ * since we know that it must have reached zero if the GLF_DEMOTE flag
+ * is set on the iopen glock. If we didn't do a disk read since the
+ * remote node removed the final link then we might otherwise miss
+ * this event. This check ensures that this node will deallocate the
+ * inode's blocks, or alternatively pass the baton on to another
+ * node for later deallocation.
+ */
- return error;
+static void gfs2_drop_inode(struct inode *inode)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+
+ if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
+ struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
+ if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
+ clear_nlink(inode);
+ }
+ generic_drop_inode(inode);
}
/**
static void gfs2_clear_inode(struct inode *inode)
{
- struct gfs2_inode *ip = get_v2ip(inode);
-
- atomic_inc(&get_v2sdp(inode->i_sb)->sd_ops_super);
-
- if (ip) {
- spin_lock(&ip->i_spin);
- ip->i_vnode = NULL;
- set_v2ip(inode, NULL);
- spin_unlock(&ip->i_spin);
-
- gfs2_glock_schedule_for_reclaim(ip->i_gl);
- gfs2_inode_put(ip);
+ struct gfs2_inode *ip = GFS2_I(inode);
+
+ /* This tells us its a "real" inode and not one which only
+ * serves to contain an address space (see rgrp.c, meta_io.c)
+ * which therefore doesn't have its own glocks.
+ */
+ if (test_bit(GIF_USER, &ip->i_flags)) {
+ ip->i_gl->gl_object = NULL;
+ gfs2_glock_put(ip->i_gl);
+ ip->i_gl = NULL;
+ if (ip->i_iopen_gh.gh_gl) {
+ ip->i_iopen_gh.gh_gl->gl_object = NULL;
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+ }
}
}
+static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
+{
+ do {
+ if (d1 == d2)
+ return 1;
+ d1 = d1->d_parent;
+ } while (!IS_ROOT(d1));
+ return 0;
+}
+
/**
* gfs2_show_options - Show mount options for /proc/mounts
* @s: seq_file structure
static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
- struct gfs2_sbd *sdp = get_v2sdp(mnt->mnt_sb);
+ struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
struct gfs2_args *args = &sdp->sd_args;
- atomic_inc(&sdp->sd_ops_super);
-
+ if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
+ seq_printf(s, ",meta");
if (args->ar_lockproto[0])
seq_printf(s, ",lockproto=%s", args->ar_lockproto);
if (args->ar_locktable[0])
seq_printf(s, ",debug");
if (args->ar_upgrade)
seq_printf(s, ",upgrade");
- if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
- seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
if (args->ar_posix_acl)
seq_printf(s, ",acl");
if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
return 0;
}
-struct super_operations gfs2_super_ops = {
- .write_inode = gfs2_write_inode,
- .put_super = gfs2_put_super,
- .write_super = gfs2_write_super,
- .write_super_lockfs = gfs2_write_super_lockfs,
- .unlockfs = gfs2_unlockfs,
- .statfs = gfs2_statfs,
- .remount_fs = gfs2_remount_fs,
- .clear_inode = gfs2_clear_inode,
- .show_options = gfs2_show_options,
+/*
+ * We have to (at the moment) hold the inodes main lock to cover
+ * the gap between unlocking the shared lock on the iopen lock and
+ * taking the exclusive lock. I'd rather do a shared -> exclusive
+ * conversion on the iopen lock, but we can change that later. This
+ * is safe, just less efficient.
+ */
+
+static void gfs2_delete_inode(struct inode *inode)
+{
+ struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int error;
+
+ if (!test_bit(GIF_USER, &ip->i_flags))
+ goto out;
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (unlikely(error)) {
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+ goto out;
+ }
+
+ gfs2_glock_dq_wait(&ip->i_iopen_gh);
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
+ error = gfs2_glock_nq(&ip->i_iopen_gh);
+ if (error)
+ goto out_truncate;
+
+ if (S_ISDIR(inode->i_mode) &&
+ (ip->i_diskflags & GFS2_DIF_EXHASH)) {
+ error = gfs2_dir_exhash_dealloc(ip);
+ if (error)
+ goto out_unlock;
+ }
+
+ if (ip->i_eattr) {
+ error = gfs2_ea_dealloc(ip);
+ if (error)
+ goto out_unlock;
+ }
+
+ if (!gfs2_is_stuffed(ip)) {
+ error = gfs2_file_dealloc(ip);
+ if (error)
+ goto out_unlock;
+ }
+
+ error = gfs2_dinode_dealloc(ip);
+ if (error)
+ goto out_unlock;
+
+out_truncate:
+ error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
+ if (error)
+ goto out_unlock;
+ /* Needs to be done before glock release & also in a transaction */
+ truncate_inode_pages(&inode->i_data, 0);
+ gfs2_trans_end(sdp);
+
+out_unlock:
+ if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
+ gfs2_glock_dq(&ip->i_iopen_gh);
+ gfs2_holder_uninit(&ip->i_iopen_gh);
+ gfs2_glock_dq_uninit(&gh);
+ if (error && error != GLR_TRYFAILED)
+ fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
+out:
+ truncate_inode_pages(&inode->i_data, 0);
+ clear_inode(inode);
+}
+
+static struct inode *gfs2_alloc_inode(struct super_block *sb)
+{
+ struct gfs2_inode *ip;
+
+ ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
+ if (ip) {
+ ip->i_flags = 0;
+ ip->i_gl = NULL;
+ }
+ return &ip->i_inode;
+}
+
+static void gfs2_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(gfs2_inode_cachep, inode);
+}
+
+const struct super_operations gfs2_super_ops = {
+ .alloc_inode = gfs2_alloc_inode,
+ .destroy_inode = gfs2_destroy_inode,
+ .write_inode = gfs2_write_inode,
+ .delete_inode = gfs2_delete_inode,
+ .put_super = gfs2_put_super,
+ .write_super = gfs2_write_super,
+ .sync_fs = gfs2_sync_fs,
+ .freeze_fs = gfs2_freeze,
+ .unfreeze_fs = gfs2_unfreeze,
+ .statfs = gfs2_statfs,
+ .remount_fs = gfs2_remount_fs,
+ .clear_inode = gfs2_clear_inode,
+ .drop_inode = gfs2_drop_inode,
+ .show_options = gfs2_show_options,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff