1 files changed, 471 insertions, 0 deletions

diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
new file mode 100644
index 00000000000..5f5fc3c4290
--- /dev/null
+++ b/fs/gfs2/ops_super.c
@@ -0,0 +1,471 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 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.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/statfs.h>
+#include <linux/vmalloc.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+
+#include "gfs2.h"
+#include "lm_interface.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"
+
+/**
+ * gfs2_write_inode - Make sure the inode is stable on the disk
+ * @inode: The inode
+ * @sync: synchronous write flag
+ *
+ * Returns: errno
+ */
+
+static int gfs2_write_inode(struct inode *inode, int sync)
+{
+        struct gfs2_inode *ip = GFS2_I(inode);
+
+        /* Check this is a "normal" inode */
+        if (inode->u.generic_ip) {
+                if (current->flags & PF_MEMALLOC)
+                        return 0;
+                if (sync)
+                        gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
+        }
+
+        return 0;
+}
+
+/**
+ * gfs2_put_super - Unmount the filesystem
+ * @sb: The VFS superblock
+ *
+ */
+
+static void gfs2_put_super(struct super_block *sb)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        int error;
+
+        if (!sdp)
+                return;
+
+        /*  Unfreeze the filesystem, if we need to  */
+
+        mutex_lock(&sdp->sd_freeze_lock);
+        if (sdp->sd_freeze_count)
+                gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
+        mutex_unlock(&sdp->sd_freeze_lock);
+
+        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);
+
+        gfs2_glock_put(sdp->sd_rename_gl);
+        gfs2_glock_put(sdp->sd_trans_gl);
+
+        if (!sdp->sd_args.ar_spectator) {
+                gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
+                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_qc_gh);
+                iput(sdp->sd_ir_inode);
+                iput(sdp->sd_sc_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);
+        /*  Unmount the locking protocol  */
+        gfs2_lm_unmount(sdp);
+
+        /*  At this point, we're through participating in the lockspace  */
+        gfs2_sys_fs_del(sdp);
+        vfree(sdp);
+        sb->s_fs_info = NULL;
+}
+
+/**
+ * gfs2_write_super - disk commit all incore transactions
+ * @sb: the filesystem
+ *
+ * This function is called every time sync(2) is called.
+ * After this exits, all dirty buffers are synced.
+ */
+
+static void gfs2_write_super(struct super_block *sb)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        gfs2_log_flush(sdp, NULL);
+}
+
+/**
+ * gfs2_write_super_lockfs - prevent further writes to the filesystem
+ * @sb: the VFS structure for the filesystem
+ *
+ */
+
+static void gfs2_write_super_lockfs(struct super_block *sb)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        int error;
+
+        for (;;) {
+                error = gfs2_freeze_fs(sdp);
+                if (!error)
+                        break;
+
+                switch (error) {
+                case -EBUSY:
+                        fs_err(sdp, "waiting for recovery before freeze\n");
+                        break;
+
+                default:
+                        fs_err(sdp, "error freezing FS: %d\n", error);
+                        break;
+                }
+
+                fs_err(sdp, "retrying...\n");
+                msleep(1000);
+        }
+}
+
+/**
+ * gfs2_unlockfs - reallow writes to the filesystem
+ * @sb: the VFS structure for the filesystem
+ *
+ */
+
+static void gfs2_unlockfs(struct super_block *sb)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        gfs2_unfreeze_fs(sdp);
+}
+
+/**
+ * gfs2_statfs - Gather and return stats about the filesystem
+ * @sb: The superblock
+ * @statfsbuf: The buffer
+ *
+ * Returns: 0 on success or error code
+ */
+
+static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        struct gfs2_statfs_change sc;
+        int error;
+
+        if (gfs2_tune_get(sdp, gt_statfs_slow))
+                error = gfs2_statfs_slow(sdp, &sc);
+        else
+                error = gfs2_statfs_i(sdp, &sc);
+
+        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;
+        buf->f_bfree = sc.sc_free;
+        buf->f_bavail = sc.sc_free;
+        buf->f_files = sc.sc_dinodes + sc.sc_free;
+        buf->f_ffree = sc.sc_free;
+        buf->f_namelen = GFS2_FNAMESIZE;
+
+        return 0;
+}
+
+/**
+ * gfs2_remount_fs - called when the FS is remounted
+ * @sb:  the filesystem
+ * @flags:  the remount flags
+ * @data:  extra data passed in (not used right now)
+ *
+ * Returns: errno
+ */
+
+static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+        struct gfs2_sbd *sdp = sb->s_fs_info;
+        int error;
+
+        error = gfs2_mount_args(sdp, data, 1);
+        if (error)
+                return error;
+
+        if (sdp->sd_args.ar_spectator)
+                *flags |= MS_RDONLY;
+        else {
+                if (*flags & MS_RDONLY) {
+                        if (!(sb->s_flags & MS_RDONLY))
+                                error = gfs2_make_fs_ro(sdp);
+                } else if (!(*flags & MS_RDONLY) &&
+                           (sb->s_flags & MS_RDONLY)) {
+                        error = gfs2_make_fs_rw(sdp);
+                }
+        }
+
+        if (*flags & (MS_NOATIME | MS_NODIRATIME))
+                set_bit(SDF_NOATIME, &sdp->sd_flags);
+        else
+                clear_bit(SDF_NOATIME, &sdp->sd_flags);
+
+        /* Don't let the VFS update atimes.  GFS2 handles this itself. */
+        *flags |= MS_NOATIME | MS_NODIRATIME;
+
+        return error;
+}
+
+/**
+ * gfs2_clear_inode - Deallocate an inode when VFS is done with it
+ * @inode: The VFS inode
+ *
+ */
+
+static void gfs2_clear_inode(struct inode *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 (inode->u.generic_ip) {
+                struct gfs2_inode *ip = GFS2_I(inode);
+                gfs2_glock_inode_squish(inode);
+                gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
+                ip->i_gl->gl_object = NULL;
+                gfs2_glock_schedule_for_reclaim(ip->i_gl);
+                gfs2_glock_put(ip->i_gl);
+                ip->i_gl = NULL;
+                if (ip->i_iopen_gh.gh_gl)
+                        gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+        }
+}
+
+/**
+ * gfs2_show_options - Show mount options for /proc/mounts
+ * @s: seq_file structure
+ * @mnt: vfsmount
+ *
+ * Returns: 0 on success or error code
+ */
+
+static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
+{
+        struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
+        struct gfs2_args *args = &sdp->sd_args;
+
+        if (args->ar_lockproto[0])
+                seq_printf(s, ",lockproto=%s", args->ar_lockproto);
+        if (args->ar_locktable[0])
+                seq_printf(s, ",locktable=%s", args->ar_locktable);
+        if (args->ar_hostdata[0])
+                seq_printf(s, ",hostdata=%s", args->ar_hostdata);
+        if (args->ar_spectator)
+                seq_printf(s, ",spectator");
+        if (args->ar_ignore_local_fs)
+                seq_printf(s, ",ignore_local_fs");
+        if (args->ar_localflocks)
+                seq_printf(s, ",localflocks");
+        if (args->ar_localcaching)
+                seq_printf(s, ",localcaching");
+        if (args->ar_debug)
+                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) {
+                char *state;
+                switch (args->ar_quota) {
+                case GFS2_QUOTA_OFF:
+                        state = "off";
+                        break;
+                case GFS2_QUOTA_ACCOUNT:
+                        state = "account";
+                        break;
+                case GFS2_QUOTA_ON:
+                        state = "on";
+                        break;
+                default:
+                        state = "unknown";
+                        break;
+                }
+                seq_printf(s, ",quota=%s", state);
+        }
+        if (args->ar_suiddir)
+                seq_printf(s, ",suiddir");
+        if (args->ar_data != GFS2_DATA_DEFAULT) {
+                char *state;
+                switch (args->ar_data) {
+                case GFS2_DATA_WRITEBACK:
+                        state = "writeback";
+                        break;
+                case GFS2_DATA_ORDERED:
+                        state = "ordered";
+                        break;
+                default:
+                        state = "unknown";
+                        break;
+                }
+                seq_printf(s, ",data=%s", state);
+        }
+
+        return 0;
+}
+
+/* 
+ * 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 (!inode->u.generic_ip)
+                goto out;
+
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
+        if (unlikely(error)) {
+                gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+                goto out;
+        }
+
+        gfs2_glock_dq(&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_uninit;
+
+        if (S_ISDIR(ip->i_di.di_mode) &&
+            (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
+                error = gfs2_dir_exhash_dealloc(ip);
+                if (error)
+                        goto out_unlock;
+        }
+
+        if (ip->i_di.di_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);
+
+out_unlock:
+        gfs2_glock_dq(&ip->i_iopen_gh);
+out_uninit:
+        gfs2_holder_uninit(&ip->i_iopen_gh);
+        gfs2_glock_dq_uninit(&gh);
+        if (error)
+                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_sbd *sdp = sb->s_fs_info;
+        struct gfs2_inode *ip;
+
+        ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
+        if (ip) {
+                ip->i_flags = 0;
+                ip->i_gl = NULL;
+                ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
+                ip->i_last_pfault = jiffies;
+        }
+        return &ip->i_inode;
+}
+
+static void gfs2_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(gfs2_inode_cachep, inode);
+}
+
+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,
+        .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,
+};
+