[mirror_ubuntu-zesty-kernel.git] / fs / xfs / linux-2.6 / xfs_super.c

/*
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_clnt.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_version.h"

#include <linux/namei.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/mempool.h>
#include <linux/writeback.h>
#include <linux/kthread.h>

STATIC struct quotactl_ops xfs_quotactl_operations;
STATIC struct super_operations xfs_super_operations;
STATIC kmem_zone_t *xfs_vnode_zone;
STATIC kmem_zone_t *xfs_ioend_zone;
mempool_t *xfs_ioend_pool;

STATIC struct xfs_mount_args *
xfs_args_allocate(
        struct super_block      *sb,
        int                     silent)
{
        struct xfs_mount_args   *args;

        args = kmem_zalloc(sizeof(struct xfs_mount_args), KM_SLEEP);
        args->logbufs = args->logbufsize = -1;
        strncpy(args->fsname, sb->s_id, MAXNAMELEN);

        /* Copy the already-parsed mount(2) flags we're interested in */
        if (sb->s_flags & MS_DIRSYNC)
                args->flags |= XFSMNT_DIRSYNC;
        if (sb->s_flags & MS_SYNCHRONOUS)
                args->flags |= XFSMNT_WSYNC;
        if (silent)
                args->flags |= XFSMNT_QUIET;
        args->flags |= XFSMNT_32BITINODES;

        return args;
}

__uint64_t
xfs_max_file_offset(
        unsigned int            blockshift)
{
        unsigned int            pagefactor = 1;
        unsigned int            bitshift = BITS_PER_LONG - 1;

        /* Figure out maximum filesize, on Linux this can depend on
         * the filesystem blocksize (on 32 bit platforms).
         * __block_prepare_write does this in an [unsigned] long...
         *      page->index << (PAGE_CACHE_SHIFT - bbits)
         * So, for page sized blocks (4K on 32 bit platforms),
         * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
         *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
         * but for smaller blocksizes it is less (bbits = log2 bsize).
         * Note1: get_block_t takes a long (implicit cast from above)
         * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
         * can optionally convert the [unsigned] long from above into
         * an [unsigned] long long.
         */

#if BITS_PER_LONG == 32
# if defined(CONFIG_LBD)
        ASSERT(sizeof(sector_t) == 8);
        pagefactor = PAGE_CACHE_SIZE;
        bitshift = BITS_PER_LONG;
# else
        pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
# endif
#endif

        return (((__uint64_t)pagefactor) << bitshift) - 1;
}

STATIC __inline__ void
xfs_set_inodeops(
        struct inode            *inode)
{
        switch (inode->i_mode & S_IFMT) {
        case S_IFREG:
                inode->i_op = &xfs_inode_operations;
                inode->i_fop = &xfs_file_operations;
                inode->i_mapping->a_ops = &xfs_address_space_operations;
                break;
        case S_IFDIR:
                inode->i_op = &xfs_dir_inode_operations;
                inode->i_fop = &xfs_dir_file_operations;
                break;
        case S_IFLNK:
                inode->i_op = &xfs_symlink_inode_operations;
                if (inode->i_blocks)
                        inode->i_mapping->a_ops = &xfs_address_space_operations;
                break;
        default:
                inode->i_op = &xfs_inode_operations;
                init_special_inode(inode, inode->i_mode, inode->i_rdev);
                break;
        }
}

STATIC __inline__ void
xfs_revalidate_inode(
        xfs_mount_t             *mp,
        bhv_vnode_t             *vp,
        xfs_inode_t             *ip)
{
        struct inode            *inode = vn_to_inode(vp);

        inode->i_mode   = ip->i_d.di_mode;
        inode->i_nlink  = ip->i_d.di_nlink;
        inode->i_uid    = ip->i_d.di_uid;
        inode->i_gid    = ip->i_d.di_gid;

        switch (inode->i_mode & S_IFMT) {
        case S_IFBLK:
        case S_IFCHR:
                inode->i_rdev =
                        MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
                              sysv_minor(ip->i_df.if_u2.if_rdev));
                break;
        default:
                inode->i_rdev = 0;
                break;
        }

        inode->i_blksize = xfs_preferred_iosize(mp);
        inode->i_generation = ip->i_d.di_gen;
        i_size_write(inode, ip->i_d.di_size);
        inode->i_blocks =
                XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
        inode->i_atime.tv_sec   = ip->i_d.di_atime.t_sec;
        inode->i_atime.tv_nsec  = ip->i_d.di_atime.t_nsec;
        inode->i_mtime.tv_sec   = ip->i_d.di_mtime.t_sec;
        inode->i_mtime.tv_nsec  = ip->i_d.di_mtime.t_nsec;
        inode->i_ctime.tv_sec   = ip->i_d.di_ctime.t_sec;
        inode->i_ctime.tv_nsec  = ip->i_d.di_ctime.t_nsec;
        if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
                inode->i_flags |= S_IMMUTABLE;
        else
                inode->i_flags &= ~S_IMMUTABLE;
        if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
                inode->i_flags |= S_APPEND;
        else
                inode->i_flags &= ~S_APPEND;
        if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
                inode->i_flags |= S_SYNC;
        else
                inode->i_flags &= ~S_SYNC;
        if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
                inode->i_flags |= S_NOATIME;
        else
                inode->i_flags &= ~S_NOATIME;
        vp->v_flag &= ~VMODIFIED;
}

void
xfs_initialize_vnode(
        bhv_desc_t              *bdp,
        bhv_vnode_t             *vp,
        bhv_desc_t              *inode_bhv,
        int                     unlock)
{
        xfs_inode_t             *ip = XFS_BHVTOI(inode_bhv);
        struct inode            *inode = vn_to_inode(vp);

        if (!inode_bhv->bd_vobj) {
                vp->v_vfsp = bhvtovfs(bdp);
                bhv_desc_init(inode_bhv, ip, vp, &xfs_vnodeops);
                bhv_insert(VN_BHV_HEAD(vp), inode_bhv);
        }

        /*
         * We need to set the ops vectors, and unlock the inode, but if
         * we have been called during the new inode create process, it is
         * too early to fill in the Linux inode.  We will get called a
         * second time once the inode is properly set up, and then we can
         * finish our work.
         */
        if (ip->i_d.di_mode != 0 && unlock && (inode->i_state & I_NEW)) {
                xfs_revalidate_inode(XFS_BHVTOM(bdp), vp, ip);
                xfs_set_inodeops(inode);

                ip->i_flags &= ~XFS_INEW;
                barrier();

                unlock_new_inode(inode);
        }
}

int
xfs_blkdev_get(
        xfs_mount_t             *mp,
        const char              *name,
        struct block_device     **bdevp)
{
        int                     error = 0;

        *bdevp = open_bdev_excl(name, 0, mp);
        if (IS_ERR(*bdevp)) {
                error = PTR_ERR(*bdevp);
                printk("XFS: Invalid device [%s], error=%d\n", name, error);
        }

        return -error;
}

void
xfs_blkdev_put(
        struct block_device     *bdev)
{
        if (bdev)
                close_bdev_excl(bdev);
}

/*
 * Try to write out the superblock using barriers.
 */
STATIC int
xfs_barrier_test(
        xfs_mount_t     *mp)
{
        xfs_buf_t       *sbp = xfs_getsb(mp, 0);
        int             error;

        XFS_BUF_UNDONE(sbp);
        XFS_BUF_UNREAD(sbp);
        XFS_BUF_UNDELAYWRITE(sbp);
        XFS_BUF_WRITE(sbp);
        XFS_BUF_UNASYNC(sbp);
        XFS_BUF_ORDERED(sbp);

        xfsbdstrat(mp, sbp);
        error = xfs_iowait(sbp);

        /*
         * Clear all the flags we set and possible error state in the
         * buffer.  We only did the write to try out whether barriers
         * worked and shouldn't leave any traces in the superblock
         * buffer.
         */
        XFS_BUF_DONE(sbp);
        XFS_BUF_ERROR(sbp, 0);
        XFS_BUF_UNORDERED(sbp);

        xfs_buf_relse(sbp);
        return error;
}

void
xfs_mountfs_check_barriers(xfs_mount_t *mp)
{
        int error;

        if (mp->m_logdev_targp != mp->m_ddev_targp) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, not supported with external log device");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }

        if (mp->m_ddev_targp->bt_bdev->bd_disk->queue->ordered ==
                                        QUEUE_ORDERED_NONE) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, not supported by the underlying device");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }

        error = xfs_barrier_test(mp);
        if (error) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, trial barrier write failed");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }
}

void
xfs_blkdev_issue_flush(
        xfs_buftarg_t           *buftarg)
{
        blkdev_issue_flush(buftarg->bt_bdev, NULL);
}

STATIC struct inode *
xfs_fs_alloc_inode(
        struct super_block      *sb)
{
        bhv_vnode_t             *vp;

        vp = kmem_zone_alloc(xfs_vnode_zone, KM_SLEEP);
        if (unlikely(!vp))
                return NULL;
        return vn_to_inode(vp);
}

STATIC void
xfs_fs_destroy_inode(
        struct inode            *inode)
{
        kmem_zone_free(xfs_vnode_zone, vn_from_inode(inode));
}

STATIC void
xfs_fs_inode_init_once(
        void                    *vnode,
        kmem_zone_t             *zonep,
        unsigned long           flags)
{
        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
                      SLAB_CTOR_CONSTRUCTOR)
                inode_init_once(vn_to_inode((bhv_vnode_t *)vnode));
}

STATIC int
xfs_init_zones(void)
{
        xfs_vnode_zone = kmem_zone_init_flags(sizeof(bhv_vnode_t), "xfs_vnode",
                                        KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
                                        KM_ZONE_SPREAD,
                                        xfs_fs_inode_init_once);
        if (!xfs_vnode_zone)
                goto out;

        xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
        if (!xfs_ioend_zone)
                goto out_destroy_vnode_zone;

        xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
                                                  xfs_ioend_zone);
        if (!xfs_ioend_pool)
                goto out_free_ioend_zone;
        return 0;

 out_free_ioend_zone:
        kmem_zone_destroy(xfs_ioend_zone);
 out_destroy_vnode_zone:
        kmem_zone_destroy(xfs_vnode_zone);
 out:
        return -ENOMEM;
}

STATIC void
xfs_destroy_zones(void)
{
        mempool_destroy(xfs_ioend_pool);
        kmem_zone_destroy(xfs_vnode_zone);
        kmem_zone_destroy(xfs_ioend_zone);
}

/*
 * Attempt to flush the inode, this will actually fail
 * if the inode is pinned, but we dirty the inode again
 * at the point when it is unpinned after a log write,
 * since this is when the inode itself becomes flushable.
 */
STATIC int
xfs_fs_write_inode(
        struct inode            *inode,
        int                     sync)
{
        bhv_vnode_t             *vp = vn_from_inode(inode);
        int                     error = 0, flags = FLUSH_INODE;

        if (vp) {
                vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
                if (sync)
                        flags |= FLUSH_SYNC;
                error = bhv_vop_iflush(vp, flags);
                if (error == EAGAIN)
                        error = sync? bhv_vop_iflush(vp, flags | FLUSH_LOG) : 0;
        }
        return -error;
}

STATIC void
xfs_fs_clear_inode(
        struct inode            *inode)
{
        bhv_vnode_t             *vp = vn_from_inode(inode);

        vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);

        XFS_STATS_INC(vn_rele);
        XFS_STATS_INC(vn_remove);
        XFS_STATS_INC(vn_reclaim);
        XFS_STATS_DEC(vn_active);

        /*
         * This can happen because xfs_iget_core calls xfs_idestroy if we
         * find an inode with di_mode == 0 but without IGET_CREATE set.
         */
        if (VNHEAD(vp))
                bhv_vop_inactive(vp, NULL);

        VN_LOCK(vp);
        vp->v_flag &= ~VMODIFIED;
        VN_UNLOCK(vp, 0);

        if (VNHEAD(vp))
                if (bhv_vop_reclaim(vp))
                        panic("%s: cannot reclaim 0x%p\n", __FUNCTION__, vp);

        ASSERT(VNHEAD(vp) == NULL);

#ifdef XFS_VNODE_TRACE
        ktrace_free(vp->v_trace);
#endif
}

/*
 * Enqueue a work item to be picked up by the vfs xfssyncd thread.
 * Doing this has two advantages:
 * - It saves on stack space, which is tight in certain situations
 * - It can be used (with care) as a mechanism to avoid deadlocks.
 * Flushing while allocating in a full filesystem requires both.
 */
STATIC void
xfs_syncd_queue_work(
        struct bhv_vfs  *vfs,
        void            *data,
        void            (*syncer)(bhv_vfs_t *, void *))
{
        struct bhv_vfs_sync_work *work;

        work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP);
        INIT_LIST_HEAD(&work->w_list);
        work->w_syncer = syncer;
        work->w_data = data;
        work->w_vfs = vfs;
        spin_lock(&vfs->vfs_sync_lock);
        list_add_tail(&work->w_list, &vfs->vfs_sync_list);
        spin_unlock(&vfs->vfs_sync_lock);
        wake_up_process(vfs->vfs_sync_task);
}

/*
 * Flush delayed allocate data, attempting to free up reserved space
 * from existing allocations.  At this point a new allocation attempt
 * has failed with ENOSPC and we are in the process of scratching our
 * heads, looking about for more room...
 */
STATIC void
xfs_flush_inode_work(
        bhv_vfs_t       *vfs,
        void            *inode)
{
        filemap_flush(((struct inode *)inode)->i_mapping);
        iput((struct inode *)inode);
}

void
xfs_flush_inode(
        xfs_inode_t     *ip)
{
        struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
        struct bhv_vfs  *vfs = XFS_MTOVFS(ip->i_mount);

        igrab(inode);
        xfs_syncd_queue_work(vfs, inode, xfs_flush_inode_work);
        delay(msecs_to_jiffies(500));
}

/*
 * This is the "bigger hammer" version of xfs_flush_inode_work...
 * (IOW, "If at first you don't succeed, use a Bigger Hammer").
 */
STATIC void
xfs_flush_device_work(
        bhv_vfs_t       *vfs,
        void            *inode)
{
        sync_blockdev(vfs->vfs_super->s_bdev);
        iput((struct inode *)inode);
}

void
xfs_flush_device(
        xfs_inode_t     *ip)
{
        struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
        struct bhv_vfs  *vfs = XFS_MTOVFS(ip->i_mount);

        igrab(inode);
        xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);
        delay(msecs_to_jiffies(500));
        xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
}

STATIC void
vfs_sync_worker(
        bhv_vfs_t       *vfsp,
        void            *unused)
{
        int             error;

        if (!(vfsp->vfs_flag & VFS_RDONLY))
                error = bhv_vfs_sync(vfsp, SYNC_FSDATA | SYNC_BDFLUSH | \
                                        SYNC_ATTR | SYNC_REFCACHE, NULL);
        vfsp->vfs_sync_seq++;
        wmb();
        wake_up(&vfsp->vfs_wait_single_sync_task);
}

STATIC int
xfssyncd(
        void                    *arg)
{
        long                    timeleft;
        bhv_vfs_t               *vfsp = (bhv_vfs_t *) arg;
        bhv_vfs_sync_work_t     *work, *n;
        LIST_HEAD               (tmp);

        timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
        for (;;) {
                timeleft = schedule_timeout_interruptible(timeleft);
                /* swsusp */
                try_to_freeze();
                if (kthread_should_stop() && list_empty(&vfsp->vfs_sync_list))
                        break;

                spin_lock(&vfsp->vfs_sync_lock);
                /*
                 * We can get woken by laptop mode, to do a sync -
                 * that's the (only!) case where the list would be
                 * empty with time remaining.
                 */
                if (!timeleft || list_empty(&vfsp->vfs_sync_list)) {
                        if (!timeleft)
                                timeleft = xfs_syncd_centisecs *
                                                        msecs_to_jiffies(10);
                        INIT_LIST_HEAD(&vfsp->vfs_sync_work.w_list);
                        list_add_tail(&vfsp->vfs_sync_work.w_list,
                                        &vfsp->vfs_sync_list);
                }
                list_for_each_entry_safe(work, n, &vfsp->vfs_sync_list, w_list)
                        list_move(&work->w_list, &tmp);
                spin_unlock(&vfsp->vfs_sync_lock);

                list_for_each_entry_safe(work, n, &tmp, w_list) {
                        (*work->w_syncer)(vfsp, work->w_data);
                        list_del(&work->w_list);
                        if (work == &vfsp->vfs_sync_work)
                                continue;
                        kmem_free(work, sizeof(struct bhv_vfs_sync_work));
                }
        }

        return 0;
}

STATIC int
xfs_fs_start_syncd(
        bhv_vfs_t               *vfsp)
{
        vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
        vfsp->vfs_sync_work.w_vfs = vfsp;
        vfsp->vfs_sync_task = kthread_run(xfssyncd, vfsp, "xfssyncd");
        if (IS_ERR(vfsp->vfs_sync_task))
                return -PTR_ERR(vfsp->vfs_sync_task);
        return 0;
}

STATIC void
xfs_fs_stop_syncd(
        bhv_vfs_t               *vfsp)
{
        kthread_stop(vfsp->vfs_sync_task);
}

STATIC void
xfs_fs_put_super(
        struct super_block      *sb)
{
        bhv_vfs_t               *vfsp = vfs_from_sb(sb);
        int                     error;

        xfs_fs_stop_syncd(vfsp);
        bhv_vfs_sync(vfsp, SYNC_ATTR | SYNC_DELWRI, NULL);
        error = bhv_vfs_unmount(vfsp, 0, NULL);
        if (error) {
                printk("XFS: unmount got error=%d\n", error);
                printk("%s: vfs=0x%p left dangling!\n", __FUNCTION__, vfsp);
        } else {
                vfs_deallocate(vfsp);
        }
}

STATIC void
xfs_fs_write_super(
        struct super_block      *sb)
{
        if (!(sb->s_flags & MS_RDONLY))
                bhv_vfs_sync(vfs_from_sb(sb), SYNC_FSDATA, NULL);
        sb->s_dirt = 0;
}

STATIC int
xfs_fs_sync_super(
        struct super_block      *sb,
        int                     wait)
{
        bhv_vfs_t               *vfsp = vfs_from_sb(sb);
        int                     error;
        int                     flags;

        if (unlikely(sb->s_frozen == SB_FREEZE_WRITE))
                flags = SYNC_QUIESCE;
        else
                flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0);

        error = bhv_vfs_sync(vfsp, flags, NULL);
        sb->s_dirt = 0;

        if (unlikely(laptop_mode)) {
                int     prev_sync_seq = vfsp->vfs_sync_seq;

                /*
                 * The disk must be active because we're syncing.
                 * We schedule xfssyncd now (now that the disk is
                 * active) instead of later (when it might not be).
                 */
                wake_up_process(vfsp->vfs_sync_task);
                /*
                 * We have to wait for the sync iteration to complete.
                 * If we don't, the disk activity caused by the sync
                 * will come after the sync is completed, and that
                 * triggers another sync from laptop mode.
                 */
                wait_event(vfsp->vfs_wait_single_sync_task,
                                vfsp->vfs_sync_seq != prev_sync_seq);
        }

        return -error;
}

STATIC int
xfs_fs_statfs(
        struct dentry           *dentry,
        struct kstatfs          *statp)
{
        return -bhv_vfs_statvfs(vfs_from_sb(dentry->d_sb), statp, NULL);
}

STATIC int
xfs_fs_remount(
        struct super_block      *sb,
        int                     *flags,
        char                    *options)
{
        bhv_vfs_t               *vfsp = vfs_from_sb(sb);
        struct xfs_mount_args   *args = xfs_args_allocate(sb, 0);
        int                     error;

        error = bhv_vfs_parseargs(vfsp, options, args, 1);
        if (!error)
                error = bhv_vfs_mntupdate(vfsp, flags, args);
        kmem_free(args, sizeof(*args));
        return -error;
}

STATIC void
xfs_fs_lockfs(
        struct super_block      *sb)
{
        bhv_vfs_freeze(vfs_from_sb(sb));
}

STATIC int
xfs_fs_show_options(
        struct seq_file         *m,
        struct vfsmount         *mnt)
{
        return -bhv_vfs_showargs(vfs_from_sb(mnt->mnt_sb), m);
}

STATIC int
xfs_fs_quotasync(
        struct super_block      *sb,
        int                     type)
{
        return -bhv_vfs_quotactl(vfs_from_sb(sb), Q_XQUOTASYNC, 0, NULL);
}

STATIC int
xfs_fs_getxstate(
        struct super_block      *sb,
        struct fs_quota_stat    *fqs)
{
        return -bhv_vfs_quotactl(vfs_from_sb(sb), Q_XGETQSTAT, 0, (caddr_t)fqs);
}

STATIC int
xfs_fs_setxstate(
        struct super_block      *sb,
        unsigned int            flags,
        int                     op)
{
        return -bhv_vfs_quotactl(vfs_from_sb(sb), op, 0, (caddr_t)&flags);
}

STATIC int
xfs_fs_getxquota(
        struct super_block      *sb,
        int                     type,
        qid_t                   id,
        struct fs_disk_quota    *fdq)
{
        return -bhv_vfs_quotactl(vfs_from_sb(sb),
                                 (type == USRQUOTA) ? Q_XGETQUOTA :
                                  ((type == GRPQUOTA) ? Q_XGETGQUOTA :
                                   Q_XGETPQUOTA), id, (caddr_t)fdq);
}

STATIC int
xfs_fs_setxquota(
        struct super_block      *sb,
        int                     type,
        qid_t                   id,
        struct fs_disk_quota    *fdq)
{
        return -bhv_vfs_quotactl(vfs_from_sb(sb),
                                 (type == USRQUOTA) ? Q_XSETQLIM :
                                  ((type == GRPQUOTA) ? Q_XSETGQLIM :
                                   Q_XSETPQLIM), id, (caddr_t)fdq);
}

STATIC int
xfs_fs_fill_super(
        struct super_block      *sb,
        void                    *data,
        int                     silent)
{
        struct bhv_vnode        *rootvp;
        struct bhv_vfs          *vfsp = vfs_allocate(sb);
        struct xfs_mount_args   *args = xfs_args_allocate(sb, silent);
        struct kstatfs          statvfs;
        int                     error;

        bhv_insert_all_vfsops(vfsp);

        error = bhv_vfs_parseargs(vfsp, (char *)data, args, 0);
        if (error) {
                bhv_remove_all_vfsops(vfsp, 1);
                goto fail_vfsop;
        }

        sb_min_blocksize(sb, BBSIZE);
        sb->s_export_op = &xfs_export_operations;
        sb->s_qcop = &xfs_quotactl_operations;
        sb->s_op = &xfs_super_operations;

        error = bhv_vfs_mount(vfsp, args, NULL);
        if (error) {
                bhv_remove_all_vfsops(vfsp, 1);
                goto fail_vfsop;
        }

        error = bhv_vfs_statvfs(vfsp, &statvfs, NULL);
        if (error)
                goto fail_unmount;

        sb->s_dirt = 1;
        sb->s_magic = statvfs.f_type;
        sb->s_blocksize = statvfs.f_bsize;
        sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
        sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
        sb->s_time_gran = 1;
        set_posix_acl_flag(sb);

        error = bhv_vfs_root(vfsp, &rootvp);
        if (error)
                goto fail_unmount;

        sb->s_root = d_alloc_root(vn_to_inode(rootvp));
        if (!sb->s_root) {
                error = ENOMEM;
                goto fail_vnrele;
        }
        if (is_bad_inode(sb->s_root->d_inode)) {
                error = EINVAL;
                goto fail_vnrele;
        }
        if ((error = xfs_fs_start_syncd(vfsp)))
                goto fail_vnrele;
        vn_trace_exit(rootvp, __FUNCTION__, (inst_t *)__return_address);

        kmem_free(args, sizeof(*args));
        return 0;

fail_vnrele:
        if (sb->s_root) {
                dput(sb->s_root);
                sb->s_root = NULL;
        } else {
                VN_RELE(rootvp);
        }

fail_unmount:
        bhv_vfs_unmount(vfsp, 0, NULL);

fail_vfsop:
        vfs_deallocate(vfsp);
        kmem_free(args, sizeof(*args));
        return -error;
}

STATIC int
xfs_fs_get_sb(
        struct file_system_type *fs_type,
        int                     flags,
        const char              *dev_name,
        void                    *data,
        struct vfsmount         *mnt)
{
        return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super,
                           mnt);
}

STATIC struct super_operations xfs_super_operations = {
        .alloc_inode            = xfs_fs_alloc_inode,
        .destroy_inode          = xfs_fs_destroy_inode,
        .write_inode            = xfs_fs_write_inode,
        .clear_inode            = xfs_fs_clear_inode,
        .put_super              = xfs_fs_put_super,
        .write_super            = xfs_fs_write_super,
        .sync_fs                = xfs_fs_sync_super,
        .write_super_lockfs     = xfs_fs_lockfs,
        .statfs                 = xfs_fs_statfs,
        .remount_fs             = xfs_fs_remount,
        .show_options           = xfs_fs_show_options,
};

STATIC struct quotactl_ops xfs_quotactl_operations = {
        .quota_sync             = xfs_fs_quotasync,
        .get_xstate             = xfs_fs_getxstate,
        .set_xstate             = xfs_fs_setxstate,
        .get_xquota             = xfs_fs_getxquota,
        .set_xquota             = xfs_fs_setxquota,
};

STATIC struct file_system_type xfs_fs_type = {
        .owner                  = THIS_MODULE,
        .name                   = "xfs",
        .get_sb                 = xfs_fs_get_sb,
        .kill_sb                = kill_block_super,
        .fs_flags               = FS_REQUIRES_DEV,
};


STATIC int __init
init_xfs_fs( void )
{
        int                     error;
        struct sysinfo          si;
        static char             message[] __initdata = KERN_INFO \
                XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";

        printk(message);

        si_meminfo(&si);
        xfs_physmem = si.totalram;

        ktrace_init(64);

        error = xfs_init_zones();
        if (error < 0)
                goto undo_zones;

        error = xfs_buf_init();
        if (error < 0)
                goto undo_buffers;

        vn_init();
        xfs_init();
        uuid_init();
        vfs_initquota();

        error = register_filesystem(&xfs_fs_type);
        if (error)
                goto undo_register;
        return 0;

undo_register:
        xfs_buf_terminate();

undo_buffers:
        xfs_destroy_zones();

undo_zones:
        return error;
}

STATIC void __exit
exit_xfs_fs( void )
{
        vfs_exitquota();
        unregister_filesystem(&xfs_fs_type);
        xfs_cleanup();
        xfs_buf_terminate();
        xfs_destroy_zones();
        ktrace_uninit();
}

module_init(init_xfs_fs);
module_exit(exit_xfs_fs);

MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
MODULE_LICENSE("GPL");