Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

[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_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/security.h>
#include <linux/falloc.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 = ip->i_vnode;

        if (inode) {
                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 exists, 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 = ip->i_vnode;

        if (inode)
                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.
 *
 * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
 *              with XFS_ICHGTIME_ACC to be sure that access time
 *              update will take.  Calling first with XFS_ICHGTIME_ACC
 *              and then XFS_ICHGTIME_MOD may fail to modify the access
 *              timestamp if the filesystem is mounted noacctm.
 */
void
xfs_ichgtime(
        xfs_inode_t     *ip,
        int             flags)
{
        struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
        timespec_t      tv;

        nanotime(&tv);
        if (flags & XFS_ICHGTIME_MOD) {
                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;
        }
        if (flags & XFS_ICHGTIME_ACC) {
                inode->i_atime = tv;
                ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
                ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
        }
        if (flags & XFS_ICHGTIME_CHG) {
                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;
        }

        /*
         * 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.
         */
        SYNCHRONIZE();
        ip->i_update_core = 1;
        if (!(inode->i_state & I_NEW))
                mark_inode_dirty_sync(inode);
}

/*
 * Variant on the above which avoids querying the system clock
 * in situations where we know the Linux inode timestamps have
 * just been updated (and so we can update our inode cheaply).
 */
void
xfs_ichgtime_fast(
        xfs_inode_t     *ip,
        struct inode    *inode,
        int             flags)
{
        timespec_t      *tvp;

        /*
         * Atime updates for read() & friends are handled lazily now, and
         * explicit updates must go through xfs_ichgtime()
         */
        ASSERT((flags & XFS_ICHGTIME_ACC) == 0);

        if (flags & XFS_ICHGTIME_MOD) {
                tvp = &inode->i_mtime;
                ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
                ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
        }
        if (flags & XFS_ICHGTIME_CHG) {
                tvp = &inode->i_ctime;
                ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
                ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec;
        }

        /*
         * 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.
         */
        SYNCHRONIZE();
        ip->i_update_core = 1;
        if (!(inode->i_state & I_NEW))
                mark_inode_dirty_sync(inode);
}


/*
 * Pull the link count and size up from the xfs inode to the linux inode
 */
STATIC void
xfs_validate_fields(
        struct inode            *inode)
{
        struct xfs_inode        *ip = XFS_I(inode);
        loff_t size;

        /* we're under i_sem so i_size can't change under us */
        size = XFS_ISIZE(ip);
        if (i_size_read(inode) != size)
                i_size_write(inode, size);
}

/*
 * 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);
        if (!error)
                xfs_iflags_set(ip, XFS_IMODIFIED);

        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,
        int             mode)
{
        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);

        if (S_ISDIR(mode))
                xfs_rmdir(XFS_I(dir), &teardown, XFS_I(inode));
        else
                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;
        xfs_acl_t       *default_acl = NULL;
        struct xfs_name name;
        attrexists_t    test_default_acl = _ACL_DEFAULT_EXISTS;
        int             error;

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

        if (test_default_acl && test_default_acl(dir)) {
                if (!_ACL_ALLOC(default_acl)) {
                        return -ENOMEM;
                }
                if (!_ACL_GET_DEFAULT(dir, default_acl)) {
                        _ACL_FREE(default_acl);
                        default_acl = NULL;
                }
        }

        xfs_dentry_to_name(&name, dentry);

        if (IS_POSIXACL(dir) && !default_acl)
                mode &= ~current->fs->umask;

        switch (mode & S_IFMT) {
        case S_IFCHR:
        case S_IFBLK:
        case S_IFIFO:
        case S_IFSOCK:
                rdev = sysv_encode_dev(rdev);
        case S_IFREG:
                error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip, NULL);
                break;
        case S_IFDIR:
                error = xfs_mkdir(XFS_I(dir), &name, mode, &ip, NULL);
                break;
        default:
                error = EINVAL;
                break;
        }

        if (unlikely(error))
                goto out_free_acl;

        inode = ip->i_vnode;

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

        if (default_acl) {
                error = _ACL_INHERIT(inode, mode, default_acl);
                if (unlikely(error))
                        goto out_cleanup_inode;
                xfs_iflags_set(ip, XFS_IMODIFIED);
                _ACL_FREE(default_acl);
        }


        if (S_ISDIR(mode))
                xfs_validate_fields(inode);
        d_instantiate(dentry, inode);
        xfs_validate_fields(dir);
        return -error;

 out_cleanup_inode:
        xfs_cleanup_inode(dir, inode, dentry, mode);
 out_free_acl:
        if (default_acl)
                _ACL_FREE(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);
        if (unlikely(error)) {
                if (unlikely(error != ENOENT))
                        return ERR_PTR(-error);
                d_add(dentry, NULL);
                return NULL;
        }

        return d_splice_alias(cip->i_vnode, dentry);
}

STATIC int
xfs_vn_link(
        struct dentry   *old_dentry,
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct inode    *inode; /* inode of guy being linked to */
        struct xfs_name name;
        int             error;

        inode = old_dentry->d_inode;
        xfs_dentry_to_name(&name, dentry);

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

        xfs_iflags_set(XFS_I(dir), XFS_IMODIFIED);
        xfs_validate_fields(inode);
        d_instantiate(dentry, inode);
        return 0;
}

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

        inode = dentry->d_inode;
        xfs_dentry_to_name(&name, dentry);

        error = xfs_remove(XFS_I(dir), &name, XFS_I(inode));
        if (likely(!error)) {
                xfs_validate_fields(dir);       /* size needs update */
                xfs_validate_fields(inode);
        }
        return -error;
}

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->fs->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 = cip->i_vnode;

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

        d_instantiate(dentry, inode);
        xfs_validate_fields(dir);
        xfs_validate_fields(inode);
        return 0;

 out_cleanup_inode:
        xfs_cleanup_inode(dir, inode, dentry, 0);
 out:
        return -error;
}

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

        xfs_dentry_to_name(&name, dentry);

        error = xfs_rmdir(XFS_I(dir), &name, XFS_I(inode));
        if (likely(!error)) {
                xfs_validate_fields(inode);
                xfs_validate_fields(dir);
        }
        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;
        int             error;

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

        error = xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
                           XFS_I(ndir), &nname, new_inode ?
                                                XFS_I(new_inode) : NULL);
        if (likely(!error)) {
                if (new_inode)
                        xfs_validate_fields(new_inode);
                xfs_validate_fields(odir);
                if (ndir != odir)
                        xfs_validate_fields(ndir);
        }
        return -error;
}

/*
 * 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);
}

#ifdef CONFIG_XFS_POSIX_ACL
STATIC int
xfs_check_acl(
        struct inode            *inode,
        int                     mask)
{
        struct xfs_inode        *ip = XFS_I(inode);
        int                     error;

        xfs_itrace_entry(ip);

        if (XFS_IFORK_Q(ip)) {
                error = xfs_acl_iaccess(ip, mask, NULL);
                if (error != -1)
                        return -error;
        }

        return -EAGAIN;
}

STATIC int
xfs_vn_permission(
        struct inode            *inode,
        int                     mask,
        struct nameidata        *nd)
{
        return generic_permission(inode, mask, xfs_check_acl);
}
#else
#define xfs_vn_permission NULL
#endif

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;
#if XFS_BIG_INUMS
        stat->ino += mp->m_inoadd;
#endif
        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    *attr)
{
        struct inode    *inode = dentry->d_inode;
        unsigned int    ia_valid = attr->ia_valid;
        bhv_vattr_t     vattr = { 0 };
        int             flags = 0;
        int             error;

        if (ia_valid & ATTR_UID) {
                vattr.va_mask |= XFS_AT_UID;
                vattr.va_uid = attr->ia_uid;
        }
        if (ia_valid & ATTR_GID) {
                vattr.va_mask |= XFS_AT_GID;
                vattr.va_gid = attr->ia_gid;
        }
        if (ia_valid & ATTR_SIZE) {
                vattr.va_mask |= XFS_AT_SIZE;
                vattr.va_size = attr->ia_size;
        }
        if (ia_valid & ATTR_ATIME) {
                vattr.va_mask |= XFS_AT_ATIME;
                vattr.va_atime = attr->ia_atime;
                inode->i_atime = attr->ia_atime;
        }
        if (ia_valid & ATTR_MTIME) {
                vattr.va_mask |= XFS_AT_MTIME;
                vattr.va_mtime = attr->ia_mtime;
        }
        if (ia_valid & ATTR_CTIME) {
                vattr.va_mask |= XFS_AT_CTIME;
                vattr.va_ctime = attr->ia_ctime;
        }
        if (ia_valid & ATTR_MODE) {
                vattr.va_mask |= XFS_AT_MODE;
                vattr.va_mode = attr->ia_mode;
                if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
                        inode->i_mode &= ~S_ISGID;
        }

        if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
                flags |= ATTR_UTIME;
#ifdef ATTR_NO_BLOCK
        if ((ia_valid & ATTR_NO_BLOCK))
                flags |= ATTR_NONBLOCK;
#endif

        error = xfs_setattr(XFS_I(inode), &vattr, flags, NULL);
        if (likely(!error))
                vn_revalidate(vn_from_inode(inode));
        return -error;
}

/*
 * 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 int
xfs_vn_setxattr(
        struct dentry   *dentry,
        const char      *name,
        const void      *data,
        size_t          size,
        int             flags)
{
        bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
        char            *attr = (char *)name;
        attrnames_t     *namesp;
        int             xflags = 0;
        int             error;

        namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
        if (!namesp)
                return -EOPNOTSUPP;
        attr += namesp->attr_namelen;
        error = namesp->attr_capable(vp, NULL);
        if (error)
                return error;

        /* Convert Linux syscall to XFS internal ATTR flags */
        if (flags & XATTR_CREATE)
                xflags |= ATTR_CREATE;
        if (flags & XATTR_REPLACE)
                xflags |= ATTR_REPLACE;
        xflags |= namesp->attr_flag;
        return namesp->attr_set(vp, attr, (void *)data, size, xflags);
}

STATIC ssize_t
xfs_vn_getxattr(
        struct dentry   *dentry,
        const char      *name,
        void            *data,
        size_t          size)
{
        bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
        char            *attr = (char *)name;
        attrnames_t     *namesp;
        int             xflags = 0;
        ssize_t         error;

        namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
        if (!namesp)
                return -EOPNOTSUPP;
        attr += namesp->attr_namelen;
        error = namesp->attr_capable(vp, NULL);
        if (error)
                return error;

        /* Convert Linux syscall to XFS internal ATTR flags */
        if (!size) {
                xflags |= ATTR_KERNOVAL;
                data = NULL;
        }
        xflags |= namesp->attr_flag;
        return namesp->attr_get(vp, attr, (void *)data, size, xflags);
}

STATIC ssize_t
xfs_vn_listxattr(
        struct dentry           *dentry,
        char                    *data,
        size_t                  size)
{
        bhv_vnode_t             *vp = vn_from_inode(dentry->d_inode);
        int                     error, xflags = ATTR_KERNAMELS;
        ssize_t                 result;

        if (!size)
                xflags |= ATTR_KERNOVAL;
        xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;

        error = attr_generic_list(vp, data, size, xflags, &result);
        if (error < 0)
                return error;
        return result;
}

STATIC int
xfs_vn_removexattr(
        struct dentry   *dentry,
        const char      *name)
{
        bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
        char            *attr = (char *)name;
        attrnames_t     *namesp;
        int             xflags = 0;
        int             error;

        namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
        if (!namesp)
                return -EOPNOTSUPP;
        attr += namesp->attr_namelen;
        error = namesp->attr_capable(vp, NULL);
        if (error)
                return error;
        xflags |= namesp->attr_flag;
        return namesp->attr_remove(vp, attr, xflags);
}

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, NULL, 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) {
                bhv_vattr_t     va;

                va.va_mask = XFS_AT_SIZE;
                va.va_size = new_size;
                error = xfs_setattr(ip, &va, ATTR_NOLOCK, NULL);
        }

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

const struct inode_operations xfs_inode_operations = {
        .permission             = xfs_vn_permission,
        .truncate               = xfs_vn_truncate,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = xfs_vn_setxattr,
        .getxattr               = xfs_vn_getxattr,
        .listxattr              = xfs_vn_listxattr,
        .removexattr            = xfs_vn_removexattr,
        .fallocate              = xfs_vn_fallocate,
};

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,
        .rmdir                  = xfs_vn_rmdir,
        .mknod                  = xfs_vn_mknod,
        .rename                 = xfs_vn_rename,
        .permission             = xfs_vn_permission,
        .getattr                = xfs_vn_getattr,
        .setattr                = xfs_vn_setattr,
        .setxattr               = xfs_vn_setxattr,
        .getxattr               = xfs_vn_getxattr,
        .listxattr              = xfs_vn_listxattr,
        .removexattr            = xfs_vn_removexattr,
};

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               = xfs_vn_setxattr,
        .getxattr               = xfs_vn_getxattr,
        .listxattr              = xfs_vn_listxattr,
        .removexattr            = xfs_vn_removexattr,
};