allow coexistance of N build and AC build.

[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / 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 <linux/capability.h>
#include <linux/xattr.h>
#include <linux/namei.h>
#include <linux/security.h>

/*
 * Get a XFS inode from a given vnode.
 */
xfs_inode_t *
xfs_vtoi(
        bhv_vnode_t     *vp)
{
        bhv_desc_t      *bdp;

        bdp = bhv_lookup_range(VN_BHV_HEAD(vp),
                        VNODE_POSITION_XFS, VNODE_POSITION_XFS);
        if (unlikely(bdp == NULL))
                return NULL;
        return XFS_BHVTOI(bdp);
}

/*
 * 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)
{
        bhv_vnode_t     *vp;

        vp = XFS_ITOV_NULL(ip);
        if (vp) {
                struct inode *inode = &vp->v_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;
        }
}

/*
 * 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_LOCK))
                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);

        /*
         * We're not supposed to change timestamps in readonly-mounted
         * filesystems.  Throw it away if anyone asks us.
         */
        if (unlikely(IS_RDONLY(inode)))
                return;

        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_LOCK))
                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    *ip,
        bhv_vattr_t     *vattr)
{
        vattr->va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
        if (!bhv_vop_getattr(vn_from_inode(ip), vattr, ATTR_LAZY, NULL)) {
                ip->i_nlink = vattr->va_nlink;
                ip->i_blocks = vattr->va_nblocks;

                /* we're under i_sem so i_size can't change under us */
                if (i_size_read(ip) != vattr->va_size)
                        i_size_write(ip, vattr->va_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(
        bhv_vnode_t     *vp,
        struct inode    *dir)
{
        struct inode    *ip = vn_to_inode(vp);
        size_t          length;
        void            *value;
        char            *name;
        int             error;

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

        error = bhv_vop_attr_set(vp, name, value, length, ATTR_SECURE, NULL);
        if (!error)
                VMODIFY(vp);

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

/*
 * Determine whether a process has a valid fs_struct (kernel daemons
 * like knfsd don't have an fs_struct).
 *
 * XXX(hch):  nfsd is broken, better fix it instead.
 */
STATIC_INLINE int
xfs_has_fs_struct(struct task_struct *task)
{
        return (task->fs != init_task.fs);
}

STATIC void
xfs_cleanup_inode(
        bhv_vnode_t     *dvp,
        bhv_vnode_t     *vp,
        struct dentry   *dentry,
        int             mode)
{
        struct dentry   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.
         */
        teardown.d_inode = vn_to_inode(vp);
        teardown.d_name = dentry->d_name;

        if (S_ISDIR(mode))
                bhv_vop_rmdir(dvp, &teardown, NULL);
        else
                bhv_vop_remove(dvp, &teardown, NULL);
        VN_RELE(vp);
}

STATIC int
xfs_vn_mknod(
        struct inode    *dir,
        struct dentry   *dentry,
        int             mode,
        dev_t           rdev)
{
        struct inode    *ip;
        bhv_vattr_t     vattr = { 0 };
        bhv_vnode_t     *vp = NULL, *dvp = vn_from_inode(dir);
        xfs_acl_t       *default_acl = NULL;
        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 (unlikely(test_default_acl && test_default_acl(dvp))) {
                if (!_ACL_ALLOC(default_acl)) {
                        return -ENOMEM;
                }
                if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
                        _ACL_FREE(default_acl);
                        default_acl = NULL;
                }
        }

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

        vattr.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
        vattr.va_mode = mode;

        switch (mode & S_IFMT) {
        case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
                vattr.va_rdev = sysv_encode_dev(rdev);
                vattr.va_mask |= XFS_AT_RDEV;
                /*FALLTHROUGH*/
        case S_IFREG:
                error = bhv_vop_create(dvp, dentry, &vattr, &vp, NULL);
                break;
        case S_IFDIR:
                error = bhv_vop_mkdir(dvp, dentry, &vattr, &vp, NULL);
                break;
        default:
                error = EINVAL;
                break;
        }

        if (unlikely(!error)) {
                error = xfs_init_security(vp, dir);
                if (error)
                        xfs_cleanup_inode(dvp, vp, dentry, mode);
        }

        if (unlikely(default_acl)) {
                if (!error) {
                        error = _ACL_INHERIT(vp, &vattr, default_acl);
                        if (!error)
                                VMODIFY(vp);
                        else
                                xfs_cleanup_inode(dvp, vp, dentry, mode);
                }
                _ACL_FREE(default_acl);
        }

        if (likely(!error)) {
                ASSERT(vp);
                ip = vn_to_inode(vp);

                if (S_ISCHR(mode) || S_ISBLK(mode))
                        ip->i_rdev = rdev;
                else if (S_ISDIR(mode))
                        xfs_validate_fields(ip, &vattr);
                d_instantiate(dentry, ip);
                xfs_validate_fields(dir, &vattr);
        }
        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)
{
        bhv_vnode_t     *vp = vn_from_inode(dir), *cvp;
        int             error;

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

        error = bhv_vop_lookup(vp, dentry, &cvp, 0, NULL, NULL);
        if (unlikely(error)) {
                if (unlikely(error != ENOENT))
                        return ERR_PTR(-error);
                d_add(dentry, NULL);
                return NULL;
        }

        return d_splice_alias(vn_to_inode(cvp), dentry);
}

STATIC int
xfs_vn_link(
        struct dentry   *old_dentry,
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct inode    *ip;    /* inode of guy being linked to */
        bhv_vnode_t     *tdvp;  /* target directory for new name/link */
        bhv_vnode_t     *vp;    /* vp of name being linked */
        bhv_vattr_t     vattr;
        int             error;

        ip = old_dentry->d_inode;       /* inode being linked to */
        tdvp = vn_from_inode(dir);
        vp = vn_from_inode(ip);

        VN_HOLD(vp);
        error = bhv_vop_link(tdvp, vp, dentry, NULL);
        if (unlikely(error)) {
                VN_RELE(vp);
        } else {
                VMODIFY(tdvp);
                xfs_validate_fields(ip, &vattr);
                d_instantiate(dentry, ip);
        }
        return -error;
}

STATIC int
xfs_vn_unlink(
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct inode    *inode;
        bhv_vnode_t     *dvp;   /* directory containing name to remove */
        bhv_vattr_t     vattr;
        int             error;

        inode = dentry->d_inode;
        dvp = vn_from_inode(dir);

        error = bhv_vop_remove(dvp, dentry, NULL);
        if (likely(!error)) {
                xfs_validate_fields(dir, &vattr);       /* size needs update */
                xfs_validate_fields(inode, &vattr);
        }
        return -error;
}

STATIC int
xfs_vn_symlink(
        struct inode    *dir,
        struct dentry   *dentry,
        const char      *symname)
{
        struct inode    *ip;
        bhv_vattr_t     va = { 0 };
        bhv_vnode_t     *dvp;   /* directory containing name of symlink */
        bhv_vnode_t     *cvp;   /* used to lookup symlink to put in dentry */
        int             error;

        dvp = vn_from_inode(dir);
        cvp = NULL;

        va.va_mode = S_IFLNK |
                (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
        va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;

        error = bhv_vop_symlink(dvp, dentry, &va, (char *)symname, &cvp, NULL);
        if (likely(!error && cvp)) {
                error = xfs_init_security(cvp, dir);
                if (likely(!error)) {
                        ip = vn_to_inode(cvp);
                        d_instantiate(dentry, ip);
                        xfs_validate_fields(dir, &va);
                        xfs_validate_fields(ip, &va);
                } else {
                        xfs_cleanup_inode(dvp, cvp, dentry, 0);
                }
        }
        return -error;
}

STATIC int
xfs_vn_rmdir(
        struct inode    *dir,
        struct dentry   *dentry)
{
        struct inode    *inode = dentry->d_inode;
        bhv_vnode_t     *dvp = vn_from_inode(dir);
        bhv_vattr_t     vattr;
        int             error;

        error = bhv_vop_rmdir(dvp, dentry, NULL);
        if (likely(!error)) {
                xfs_validate_fields(inode, &vattr);
                xfs_validate_fields(dir, &vattr);
        }
        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;
        bhv_vnode_t     *fvp;   /* from directory */
        bhv_vnode_t     *tvp;   /* target directory */
        bhv_vattr_t     vattr;
        int             error;

        fvp = vn_from_inode(odir);
        tvp = vn_from_inode(ndir);

        error = bhv_vop_rename(fvp, odentry, tvp, ndentry, NULL);
        if (likely(!error)) {
                if (new_inode)
                        xfs_validate_fields(new_inode, &vattr);
                xfs_validate_fields(odir, &vattr);
                if (ndir != odir)
                        xfs_validate_fields(ndir, &vattr);
        }
        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)
{
        bhv_vnode_t             *vp;
        uio_t                   *uio;
        iovec_t                 iov;
        int                     error;
        char                    *link;

        ASSERT(dentry);
        ASSERT(nd);

        link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
        if (!link) {
                nd_set_link(nd, ERR_PTR(-ENOMEM));
                return NULL;
        }

        uio = kmalloc(sizeof(uio_t), GFP_KERNEL);
        if (!uio) {
                kfree(link);
                nd_set_link(nd, ERR_PTR(-ENOMEM));
                return NULL;
        }

        vp = vn_from_inode(dentry->d_inode);

        iov.iov_base = link;
        iov.iov_len = MAXPATHLEN;

        uio->uio_iov = &iov;
        uio->uio_offset = 0;
        uio->uio_segflg = UIO_SYSSPACE;
        uio->uio_resid = MAXPATHLEN;
        uio->uio_iovcnt = 1;

        error = bhv_vop_readlink(vp, uio, 0, NULL);
        if (unlikely(error)) {
                kfree(link);
                link = ERR_PTR(-error);
        } else {
                link[MAXPATHLEN - uio->uio_resid] = '\0';
        }
        kfree(uio);

        nd_set_link(nd, link);
        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_vn_permission(
        struct inode    *inode,
        int             mode,
        struct nameidata *nd)
{
        return -bhv_vop_access(vn_from_inode(inode), mode << 6, NULL);
}
#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;
        bhv_vnode_t     *vp = vn_from_inode(inode);
        bhv_vattr_t     vattr = { .va_mask = XFS_AT_STAT };
        int             error;

        error = bhv_vop_getattr(vp, &vattr, ATTR_LAZY, NULL);
        if (likely(!error)) {
                stat->size = i_size_read(inode);
                stat->dev = inode->i_sb->s_dev;
                stat->rdev = (vattr.va_rdev == 0) ? 0 :
                                MKDEV(sysv_major(vattr.va_rdev) & 0x1ff,
                                      sysv_minor(vattr.va_rdev));
                stat->mode = vattr.va_mode;
                stat->nlink = vattr.va_nlink;
                stat->uid = vattr.va_uid;
                stat->gid = vattr.va_gid;
                stat->ino = vattr.va_nodeid;
                stat->atime = vattr.va_atime;
                stat->mtime = vattr.va_mtime;
                stat->ctime = vattr.va_ctime;
                stat->blocks = vattr.va_nblocks;
                stat->blksize = vattr.va_blocksize;
        }
        return -error;
}

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_vnode_t     *vp = vn_from_inode(inode);
        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 = bhv_vop_setattr(vp, &vattr, flags, NULL);
        if (likely(!error))
                __vn_revalidate(vp, &vattr);
        return -error;
}

STATIC void
xfs_vn_truncate(
        struct inode    *inode)
{
        block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_blocks);
}

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);
}


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,
};

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,
};