xfs: reduce bmv_count in xfs_vn_fiemap

[linux/fpc-iii.git] / fs / xfs / linux-2.6 / xfs_iops.c

/*
 * Copyright (c) 2000-2005 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_fs.h"
#include "xfs_acl.h"
#include "xfs_bit.h"
#include "xfs_log.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_bmap.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_vnodeops.h"

#include <linux/capability.h>
#include <linux/xattr.h>
#include <linux/namei.h>
#include <linux/posix_acl.h>
#include <linux/security.h>
#include <linux/falloc.h>
#include <linux/fiemap.h>

/*
 * Bring the atime in the XFS inode uptodate.
 * Used before logging the inode to disk or when the Linux inode goes away.
 */
void
xfs_synchronize_atime(
        xfs_inode_t     *ip)
{
        struct inode    *inode = VFS_I(ip);

        if (!(inode->i_state & I_CLEAR)) {
                ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
                ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
        }
}

/*
 * If the linux inode is valid, mark it dirty.
 * Used when commiting a dirty inode into a transaction so that
 * the inode will get written back by the linux code
 */
void
xfs_mark_inode_dirty_sync(
        xfs_inode_t     *ip)
{
        struct inode    *inode = VFS_I(ip);

        if (!(inode->i_state & (I_WILL_FREE|I_FREEING|I_CLEAR)))
                mark_inode_dirty_sync(inode);
}

/*
 * Change the requested timestamp in the given inode.
 * We don't lock across timestamp updates, and we don't log them but
 * we do record the fact that there is dirty information in core.
 */
void
xfs_ichgtime(
        xfs_inode_t     *ip,
        int             flags)
{
        struct inode    *inode = VFS_I(ip);
        timespec_t      tv;
        int             sync_it = 0;

        tv = current_fs_time(inode->i_sb);

        if ((flags & XFS_ICHGTIME_MOD) &&
            !timespec_equal(&inode->i_mtime, &tv)) {
                inode->i_mtime = tv;
                ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
                ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
                sync_it = 1;
        }
        if ((flags & XFS_ICHGTIME_CHG) &&
            !timespec_equal(&inode->i_ctime, &tv)) {
                inode->i_ctime = tv;
                ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
                ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
                sync_it = 1;
        }

        /*
         * We update the i_update_core field _after_ changing
         * the timestamps in order to coordinate properly with
         * xfs_iflush() so that we don't lose timestamp updates.
         * This keeps us from having to hold the inode lock
         * while doing this.  We use the SYNCHRONIZE macro to
         * ensure that the compiler does not reorder the update
         * of i_update_core above the timestamp updates above.
         */
        if (sync_it) {
                SYNCHRONIZE();
                ip->i_update_core = 1;
                xfs_mark_inode_dirty_sync(ip);
        }
}

/*
 * Hook in SELinux.  This is not quite correct yet, what we really need
 * here (as we do for default ACLs) is a mechanism by which creation of
 * these attrs can be journalled at inode creation time (along with the
 * inode, of course, such that log replay can't cause these to be lost).
 */
STATIC int
xfs_init_security(
        struct inode    *inode,
        struct inode    *dir)
{
        struct xfs_inode *ip = XFS_I(inode);
        size_t          length;
        void            *value;
        char            *name;
        int             error;

        error = security_inode_init_security(inode, dir, &name,
                                             &value, &length);
        if (error) {
                if (error == -EOPNOTSUPP)
                        return 0;
                return -error;
        }

        error = xfs_attr_set(ip, name, value, length, ATTR_SECURE);

        kfree(name);
        kfree(value);
        return error;
}

static void
xfs_dentry_to_name(
        struct xfs_name *namep,
        struct dentry   *dentry)
{
        namep->name = dentry->d_name.name;
        namep->len = dentry->d_name.len;
}

STATIC void
xfs_cleanup_inode(
        struct inode    *dir,
        struct inode    *inode,
        struct dentry   *dentry)
{
        struct xfs_name teardown;

        /* Oh, the horror.
         * If we can't add the ACL or we fail in
         * xfs_init_security we must back out.
         * ENOSPC can hit here, among other things.
         */
        xfs_dentry_to_name(&teardown, dentry);

        xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
        iput(inode);
}

STATIC int
xfs_vn_mknod(
        struct inode    *dir,
        struct dentry   *dentry,
        int             mode,
        dev_t           rdev)
{
        struct inode    *inode;
        struct xfs_inode *ip = NULL;
        struct posix_acl *default_acl = NULL;
        struct xfs_name name;
        int             error;

        /*
         * Irix uses Missed'em'V split, but doesn't want to see
         * the upper 5 bits of (14bit) major.
         */
        if (S_ISCHR(mode) || S_ISBLK(mode)) {
                if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
                        return -EINVAL;
                rdev = sysv_encode_dev(rdev);
        } else {
                rdev = 0;
        }

        if (IS_POSIXACL(dir)) {
                default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT);
                if (IS_ERR(default_acl))
                        return -PTR_ERR(default_acl);

                if (!default_acl)
                        mode &= ~current_umask();
        }

        xfs_dentry_to_name(&name, dentry);
        error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip, NULL);
        if (unlikely(error))
                goto out_free_acl;

        inode = VFS_I(ip);

        error = xfs_init_security(inode, dir);
        if (unlikely(error))
                goto out_cleanup_inode;

        if (default_acl) {
                error = -xfs_inherit_acl(inode, default_acl);
                if (unlikely(error))
                        goto out_cleanup_inode;
                posix_acl_release(default_acl);
        }


        d_instantiate(dentry, inode);
        return -error;

 out_cleanup_inode:
        xfs_cleanup_inode(dir, inode, dentry);
 out_free_acl:
        posix_acl_release(default_acl);
        return -error;
}

STATIC int
xfs_vn_create(
        struct inode    *dir,
        struct dentry   *dentry,
        int             mode,
        struct nameidata *nd)
{
        return xfs_vn_mknod(dir, dentry, mode, 0);
}

STATIC int
xfs_vn_mkdir(
        struct inode    *dir,
        struct dentry   *dentry,
        int             mode)
{
        return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
}

STATIC struct dentry *
xfs_vn_lookup(
        struct inode    *dir,
        struct dentry   *dentry,
        struct nameidata *nd)
{
        struct xfs_inode *cip;
        struct xfs_name name;
        int             error;

        if (dentry->d_name.len >= MAXNAMELEN)
                return ERR_PTR(-ENAMETOOLONG);

        xfs_dentry_to_name(&name, dentry);
        error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
        if (unlikely(error)) {
                if (unlikely(error != ENOENT))
                        return ERR_PTR(-error);
                d_add(dentry, NULL);
                return NULL;
        }

        return d_splice_alias(VFS_I(cip), dentry);
}

STATIC struct dentry *
xfs_vn_ci_lookup(
        struct inode    *dir,
        struct dentry   *dentry,
        struct nameidata *nd)
{
        struct xfs_inode *ip;
        struct xfs_name xname;
        struct xfs_name ci_name;
        struct qstr     dname;
        int             error;

        if (dentry->d_name.len >= MAXNAMELEN)
                return ERR_PTR(-ENAMETOOLONG);

        xfs_dentry_to_name(&xname, dentry);
        error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
        if (unlikely(error)) {
                if (unlikely(error != ENOENT))
                        return ERR_PTR(-error);
                /*
                 * call d_add(dentry, NULL) here when d_drop_negative_children
                 * is called in xfs_vn_mknod (ie. allow negative dentries
                 * with CI filesystems).
                 */
                return NULL;
        }

        /* if exact match, just splice and exit */
        if (!ci_name.name)
                return d_splice_alias(VFS_I(ip), dentry);

        /* else case-insensitive match... */
        dname.name = ci_name.name;
        dname.len = ci_name.len;
        dentry = d_add_ci(dentry, VFS_I(ip), &dname);
        kmem_free(ci_name.name);
        return dentry;
}

STATIC int
xfs_vn_link(
        struct dentry   *old_dentry,
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct inode    *inode = old_dentry->d_inode;
        struct xfs_name name;
        int             error;

        xfs_dentry_to_name(&name, dentry);

        error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
        if (unlikely(error))
                return -error;

        atomic_inc(&inode->i_count);
        d_instantiate(dentry, inode);
        return 0;
}

STATIC int
xfs_vn_unlink(
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct xfs_name name;
        int             error;

        xfs_dentry_to_name(&name, dentry);

        error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
        if (error)
                return error;

        /*
         * With unlink, the VFS makes the dentry "negative": no inode,
         * but still hashed. This is incompatible with case-insensitive
         * mode, so invalidate (unhash) the dentry in CI-mode.
         */
        if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
                d_invalidate(dentry);
        return 0;
}

STATIC int
xfs_vn_symlink(
        struct inode    *dir,
        struct dentry   *dentry,
        const char      *symname)
{
        struct inode    *inode;
        struct xfs_inode *cip = NULL;
        struct xfs_name name;
        int             error;
        mode_t          mode;

        mode = S_IFLNK |
                (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
        xfs_dentry_to_name(&name, dentry);

        error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip, NULL);
        if (unlikely(error))
                goto out;

        inode = VFS_I(cip);

        error = xfs_init_security(inode, dir);
        if (unlikely(error))
                goto out_cleanup_inode;

        d_instantiate(dentry, inode);
        return 0;

 out_cleanup_inode:
        xfs_cleanup_inode(dir, inode, dentry);
 out:
        return -error;
}

STATIC int
xfs_vn_rename(
        struct inode    *odir,
        struct dentry   *odentry,
        struct inode    *ndir,
        struct dentry   *ndentry)
{
        struct inode    *new_inode = ndentry->d_inode;
        struct xfs_name oname;
        struct xfs_name nname;

        xfs_dentry_to_name(&oname, odentry);
        xfs_dentry_to_name(&nname, ndentry);

        return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
                           XFS_I(ndir), &nname, new_inode ?
                                                XFS_I(new_inode) : NULL);
}

/*
 * careful here - this function can get called recursively, so
 * we need to be very careful about how much stack we use.
 * uio is kmalloced for this reason...
 */
STATIC void *
xfs_vn_follow_link(
        struct dentry           *dentry,
        struct nameidata        *nd)
{
        char                    *link;
        int                     error = -ENOMEM;

        link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
        if (!link)
                goto out_err;

        error = -xfs_readlink(XFS_I(dentry->d_inode), link);
        if (unlikely(error))
                goto out_kfree;

        nd_set_link(nd, link);
        return NULL;

 out_kfree:
        kfree(link);
 out_err:
        nd_set_link(nd, ERR_PTR(error));
        return NULL;
}

STATIC void
xfs_vn_put_link(
        struct dentry   *dentry,
        struct nameidata *nd,
        void            *p)
{
        char            *s = nd_get_link(nd);

        if (!IS_ERR(s))
                kfree(s);
}

STATIC int
xfs_vn_permission(
        struct inode            *inode,
        int                     mask)
{
        return generic_permission(inode, mask, xfs_check_acl);
}

STATIC int
xfs_vn_getattr(
        struct vfsmount         *mnt,
        struct dentry           *dentry,
        struct kstat            *stat)
{
        struct inode            *inode = dentry->d_inode;
        struct xfs_inode        *ip = XFS_I(inode);
        struct xfs_mount        *mp = ip->i_mount;

        xfs_itrace_entry(ip);

        if (XFS_FORCED_SHUTDOWN(mp))
                return XFS_ERROR(EIO);

        stat->size = XFS_ISIZE(ip);
        stat->dev = inode->i_sb->s_dev;
        stat->mode = ip->i_d.di_mode;
        stat->nlink = ip->i_d.di_nlink;
        stat->uid = ip->i_d.di_uid;
        stat->gid = ip->i_d.di_gid;
        stat->ino = ip->i_ino;
        stat->atime = inode->i_atime;
        stat->mtime.tv_sec = ip->i_d.di_mtime.t_sec;
        stat->mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
        stat->ctime.tv_sec = ip->i_d.di_ctime.t_sec;
        stat->ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
        stat->blocks =
                XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);


        switch (inode->i_mode & S_IFMT) {
        case S_IFBLK:
        case S_IFCHR:
                stat->blksize = BLKDEV_IOSIZE;
                stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
                                   sysv_minor(ip->i_df.if_u2.if_rdev));
                break;
        default:
                if (XFS_IS_REALTIME_INODE(ip)) {
                        /*
                         * If the file blocks are being allocated from a
                         * realtime volume, then return the inode's realtime
                         * extent size or the realtime volume's extent size.
                         */
                        stat->blksize =
                                xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
                } else
                        stat->blksize = xfs_preferred_iosize(mp);
                stat->rdev = 0;
                break;
        }

        return 0;
}

STATIC int
xfs_vn_setattr(
        struct dentry   *dentry,
        struct iattr    *iattr)
{
        return -xfs_setattr(XFS_I(dentry->d_inode), iattr, 0);
}

/*
 * block_truncate_page can return an error, but we can't propagate it
 * at all here. Leave a complaint + stack trace in the syslog because
 * this could be bad. If it is bad, we need to propagate the error further.
 */
STATIC void
xfs_vn_truncate(
        struct inode    *inode)
{
        int     error;
        error = block_truncate_page(inode->i_mapping, inode->i_size,
                                                        xfs_get_blocks);
        WARN_ON(error);
}

STATIC long
xfs_vn_fallocate(
        struct inode    *inode,
        int             mode,
        loff_t          offset,
        loff_t          len)
{
        long            error;
        loff_t          new_size = 0;
        xfs_flock64_t   bf;
        xfs_inode_t     *ip = XFS_I(inode);

        /* preallocation on directories not yet supported */
        error = -ENODEV;
        if (S_ISDIR(inode->i_mode))
                goto out_error;

        bf.l_whence = 0;
        bf.l_start = offset;
        bf.l_len = len;

        xfs_ilock(ip, XFS_IOLOCK_EXCL);
        error = xfs_change_file_space(ip, XFS_IOC_RESVSP, &bf,
                                      0, XFS_ATTR_NOLOCK);
        if (!error && !(mode & FALLOC_FL_KEEP_SIZE) &&
            offset + len > i_size_read(inode))
                new_size = offset + len;

        /* Change file size if needed */
        if (new_size) {
                struct iattr iattr;

                iattr.ia_valid = ATTR_SIZE;
                iattr.ia_size = new_size;
                error = xfs_setattr(ip, &iattr, XFS_ATTR_NOLOCK);
        }

        xfs_iunlock(ip, XFS_IOLOCK_EXCL);
out_error:
        return error;
}

#define XFS_FIEMAP_FLAGS        (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)

/*
 * Call fiemap helper to fill in user data.
 * Returns positive errors to xfs_getbmap.
 */
STATIC int
xfs_fiemap_format(
        void                    **arg,
        struct getbmapx         *bmv,
        int                     *full)
{
        int                     error;
        struct fiemap_extent_info *fieinfo = *arg;
        u32                     fiemap_flags = 0;
        u64                     logical, physical, length;

        /* Do nothing for a hole */
        if (bmv->bmv_block == -1LL)
                return 0;

        logical = BBTOB(bmv->bmv_offset);
        physical = BBTOB(bmv->bmv_block);
        length = BBTOB(bmv->bmv_length);

        if (bmv->bmv_oflags & BMV_OF_PREALLOC)
                fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
        else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
                fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
                physical = 0;   /* no block yet */
        }
        if (bmv->bmv_oflags & BMV_OF_LAST)
                fiemap_flags |= FIEMAP_EXTENT_LAST;

        error = fiemap_fill_next_extent(fieinfo, logical, physical,
                                        length, fiemap_flags);
        if (error > 0) {
                error = 0;
                *full = 1;      /* user array now full */
        }

        return -error;
}

STATIC int
xfs_vn_fiemap(
        struct inode            *inode,
        struct fiemap_extent_info *fieinfo,
        u64                     start,
        u64                     length)
{
        xfs_inode_t             *ip = XFS_I(inode);
        struct getbmapx         bm;
        int                     error;

        error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
        if (error)
                return error;

        /* Set up bmap header for xfs internal routine */
        bm.bmv_offset = BTOBB(start);
        /* Special case for whole file */
        if (length == FIEMAP_MAX_OFFSET)
                bm.bmv_length = -1LL;
        else
                bm.bmv_length = BTOBB(length);

        /* We add one because in getbmap world count includes the header */
        bm.bmv_count = fieinfo->fi_extents_max + 1;
        bm.bmv_iflags = BMV_IF_PREALLOC;
        if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
                bm.bmv_iflags |= BMV_IF_ATTRFORK;
        if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
                bm.bmv_iflags |= BMV_IF_DELALLOC;

        error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
        if (error)
                return -error;

        return 0;
}

static const struct inode_operations xfs_inode_operations = {
        .permission             = xfs_vn_permission,
        .truncate               = xfs_vn_truncate,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = generic_setxattr,
        .getxattr               = generic_getxattr,
        .removexattr            = generic_removexattr,
        .listxattr              = xfs_vn_listxattr,
        .fallocate              = xfs_vn_fallocate,
        .fiemap                 = xfs_vn_fiemap,
};

static const struct inode_operations xfs_dir_inode_operations = {
        .create                 = xfs_vn_create,
        .lookup                 = xfs_vn_lookup,
        .link                   = xfs_vn_link,
        .unlink                 = xfs_vn_unlink,
        .symlink                = xfs_vn_symlink,
        .mkdir                  = xfs_vn_mkdir,
        /*
         * Yes, XFS uses the same method for rmdir and unlink.
         *
         * There are some subtile differences deeper in the code,
         * but we use S_ISDIR to check for those.
         */
        .rmdir                  = xfs_vn_unlink,
        .mknod                  = xfs_vn_mknod,
        .rename                 = xfs_vn_rename,
        .permission             = xfs_vn_permission,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = generic_setxattr,
        .getxattr               = generic_getxattr,
        .removexattr            = generic_removexattr,
        .listxattr              = xfs_vn_listxattr,
};

static const struct inode_operations xfs_dir_ci_inode_operations = {
        .create                 = xfs_vn_create,
        .lookup                 = xfs_vn_ci_lookup,
        .link                   = xfs_vn_link,
        .unlink                 = xfs_vn_unlink,
        .symlink                = xfs_vn_symlink,
        .mkdir                  = xfs_vn_mkdir,
        /*
         * Yes, XFS uses the same method for rmdir and unlink.
         *
         * There are some subtile differences deeper in the code,
         * but we use S_ISDIR to check for those.
         */
        .rmdir                  = xfs_vn_unlink,
        .mknod                  = xfs_vn_mknod,
        .rename                 = xfs_vn_rename,
        .permission             = xfs_vn_permission,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = generic_setxattr,
        .getxattr               = generic_getxattr,
        .removexattr            = generic_removexattr,
        .listxattr              = xfs_vn_listxattr,
};

static const struct inode_operations xfs_symlink_inode_operations = {
        .readlink               = generic_readlink,
        .follow_link            = xfs_vn_follow_link,
        .put_link               = xfs_vn_put_link,
        .permission             = xfs_vn_permission,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = generic_setxattr,
        .getxattr               = generic_getxattr,
        .removexattr            = generic_removexattr,
        .listxattr              = xfs_vn_listxattr,
};

STATIC void
xfs_diflags_to_iflags(
        struct inode            *inode,
        struct xfs_inode        *ip)
{
        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;
}

/*
 * Initialize the Linux inode, set up the operation vectors and
 * unlock the inode.
 *
 * When reading existing inodes from disk this is called directly
 * from xfs_iget, when creating a new inode it is called from
 * xfs_ialloc after setting up the inode.
 *
 * We are always called with an uninitialised linux inode here.
 * We need to initialise the necessary fields and take a reference
 * on it.
 */
void
xfs_setup_inode(
        struct xfs_inode        *ip)
{
        struct inode            *inode = &ip->i_vnode;

        inode->i_ino = ip->i_ino;
        inode->i_state = I_NEW|I_LOCK;
        inode_add_to_lists(ip->i_mount->m_super, inode);

        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_generation = ip->i_d.di_gen;
        i_size_write(inode, ip->i_d.di_size);
        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;
        xfs_diflags_to_iflags(inode, ip);

        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:
                if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
                        inode->i_op = &xfs_dir_ci_inode_operations;
                else
                        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 (!(ip->i_df.if_flags & XFS_IFINLINE))
                        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;
        }

        xfs_iflags_clear(ip, XFS_INEW);
        barrier();

        unlock_new_inode(inode);
}