/*
* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include <xfs.h>
#include <linux/bitops.h>
#include <linux/xfs_iops.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include "xfs_version.h"
/* xfs_vfs[ops].c */
extern int xfs_init(int fstype);
extern void xfs_cleanup(void);
/* For kernels which have the s_maxbytes field - set it */
#ifdef MAX_NON_LFS
# define set_max_bytes(sb) ((sb)->s_maxbytes = XFS_MAX_FILE_OFFSET)
#else
# define set_max_bytes(sb) do { } while (0)
#endif
#ifdef CONFIG_FS_POSIX_ACL
# define set_posix_acl(sb) ((sb)->s_flags |= MS_POSIXACL)
#else
# define set_posix_acl(sb) do { } while (0)
#endif
#ifdef CONFIG_XFS_QUOTA
static struct quotactl_ops linvfs_qops = {
.get_xstate = linvfs_getxstate,
.set_xstate = linvfs_setxstate,
.get_xquota = linvfs_getxquota,
.set_xquota = linvfs_setxquota,
};
# define set_quota_ops(sb) ((sb)->s_qcop = &linvfs_qops)
#else
# define set_quota_ops(sb) do { } while (0)
#endif
#ifdef CONFIG_XFS_DMAPI
int dmapi_init(void);
void dmapi_uninit(void);
#else
#define dmapi_init()
#define dmapi_uninit()
#endif
static struct super_operations linvfs_sops;
#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
#define MNTOPT_LOGDEV "logdev" /* log device */
#define MNTOPT_RTDEV "rtdev" /* realtime I/O device */
#define MNTOPT_DMAPI "dmapi" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_XDSM "xdsm" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */
#define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */
#define MNTOPT_INO64 "ino64" /* force inodes into 64-bit range */
#define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */
#define MNTOPT_SUNIT "sunit" /* data volume stripe unit */
#define MNTOPT_SWIDTH "swidth" /* data volume stripe width */
#define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */
#define MNTOPT_OSYNCISDSYNC "osyncisdsync" /* o_sync == o_dsync on this fs */
/* (this is now the default!) */
#define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
#define MNTOPT_QUOTA "quota" /* disk quotas */
#define MNTOPT_MRQUOTA "mrquota" /* don't turnoff if SB has quotas on */
#define MNTOPT_NOQUOTA "noquota" /* no quotas */
#define MNTOPT_UQUOTA "usrquota" /* user quota enabled */
#define MNTOPT_GQUOTA "grpquota" /* group quota enabled */
#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
#define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */
#define MNTOPT_NOUUID "nouuid" /* Ignore FS uuid */
#define MNTOPT_IRIXSGID "irixsgid" /* Irix-style sgid inheritance */
#define MNTOPT_NOLOGFLUSH "nologflush" /* Don't use hard flushes in
log writing */
#define MNTOPT_MTPT "mtpt" /* filesystem mount point */
STATIC int
xfs_parseargs(
char *options,
int flags,
struct xfs_mount_args *args)
{
char *this_char, *value, *eov;
int logbufs = -1;
int logbufsize = -1;
int dsunit, dswidth, vol_dsunit, vol_dswidth;
int iosize;
int rval = 1; /* failure is default */
iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;
memset(args, 0, sizeof(struct xfs_mount_args));
args->slcount = args->stimeout = args->ctimeout = -1;
args->mtpt[0] = '\0';
/* Copy the already-parsed mount(2) flags we're interested in */
if (flags & MS_NOATIME)
args->flags |= XFSMNT_NOATIME;
if (!options) {
args->logbufs = logbufs;
args->logbufsize = logbufsize;
return 0;
}
while ((this_char = strsep (&options, ",")) != NULL) {
if (!*this_char)
continue;
if ((value = strchr (this_char, '=')) != NULL)
*value++ = 0;
if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
logbufs = simple_strtoul(value, &eov, 10);
} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
int in_kilobytes = 0;
if (toupper(value[strlen(value)-1]) == 'K') {
in_kilobytes = 1;
value[strlen(value)-1] = '\0';
}
logbufsize = simple_strtoul(value, &eov, 10);
if (in_kilobytes)
logbufsize = logbufsize * 1024;
} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
strncpy(args->logname, value, MAXNAMELEN);
} else if (!strcmp(this_char, MNTOPT_MTPT)) {
strncpy(args->mtpt, value, MAXNAMELEN);
#if CONFIG_XFS_DMAPI
} else if (!strcmp(this_char, MNTOPT_DMAPI)) {
args->flags |= XFSMNT_DMAPI;
} else if (!strcmp(this_char, MNTOPT_XDSM)) {
args->flags |= XFSMNT_DMAPI;
#else
} else if (!strcmp(this_char, MNTOPT_DMAPI) ||
!strcmp(this_char, MNTOPT_XDSM)) {
printk("XFS: this kernel does not support dmapi/xdsm.\n");
return rval;
#endif
} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
strncpy(args->rtname, value, MAXNAMELEN);
} else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
iosize = simple_strtoul(value, &eov, 10);
args->flags |= XFSMNT_IOSIZE;
args->iosizelog = (uint8_t) iosize;
} else if (!strcmp(this_char, MNTOPT_WSYNC)) {
args->flags |= XFSMNT_WSYNC;
} else if (!strcmp(this_char, MNTOPT_OSYNCISDSYNC)) {
/* no-op, this is now the default */
printk("XFS: osyncisdsync is now the default, and will soon be deprecated.\n");
} else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
args->flags |= XFSMNT_OSYNCISOSYNC;
} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
args->flags |= XFSMNT_NORECOVERY;
} else if (!strcmp(this_char, MNTOPT_INO64)) {
#ifdef XFS_BIG_FILESYSTEMS
args->flags |= XFSMNT_INO64;
#else
printk("XFS: ino64 option not allowed on this system\n");
return rval;
#endif
} else if (!strcmp(this_char, MNTOPT_UQUOTA)) {
args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_QUOTA)) {
args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_UQUOTANOENF)) {
args->flags |= XFSMNT_UQUOTA;
args->flags &= ~XFSMNT_UQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_QUOTANOENF)) {
args->flags |= XFSMNT_UQUOTA;
args->flags &= ~XFSMNT_UQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_MRQUOTA)) {
args->flags |= XFSMNT_QUOTAMAYBE;
} else if (!strcmp(this_char, MNTOPT_GQUOTA)) {
args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
args->flags |= XFSMNT_GQUOTA;
args->flags &= ~XFSMNT_GQUOTAENF;
} else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
args->flags |= XFSMNT_NOALIGN;
} else if (!strcmp(this_char, MNTOPT_SUNIT)) {
dsunit = simple_strtoul(value, &eov, 10);
} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
dswidth = simple_strtoul(value, &eov, 10);
} else if (!strcmp(this_char, MNTOPT_NOUUID)) {
args->flags |= XFSMNT_NOUUID;
} else if (!strcmp(this_char, MNTOPT_IRIXSGID)) {
args->flags |= XFSMNT_IRIXSGID;
} else if (!strcmp(this_char, MNTOPT_NOLOGFLUSH)) {
args->flags |= XFSMNT_NOLOGFLUSH;
} else {
printk("XFS: unknown mount option [%s].\n", this_char);
return rval;
}
}
if (args->flags & XFSMNT_NORECOVERY) {
if ((flags & MS_RDONLY) == 0) {
printk("XFS: no-recovery mounts must be read-only.\n");
return rval;
}
}
if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
printk(
"XFS: sunit and swidth options incompatible with the noalign option\n");
return rval;
}
if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
printk("XFS: sunit and swidth must be specified together\n");
return rval;
}
if (dsunit && (dswidth % dsunit != 0)) {
printk(
"XFS: stripe width (%d) must be a multiple of the stripe unit (%d)\n",
dswidth, dsunit);
return rval;
}
if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
if (dsunit) {
args->sunit = dsunit;
args->flags |= XFSMNT_RETERR;
} else
args->sunit = vol_dsunit;
dswidth ? (args->swidth = dswidth) :
(args->swidth = vol_dswidth);
} else
args->sunit = args->swidth = 0;
args->logbufs = logbufs;
args->logbufsize = logbufsize;
return 0;
}
/*
* Convert one device special file to a dev_t.
* Helper routine, used only by spectodevs below.
*/
STATIC int
spectodev(
const char *name,
const char *id,
dev_t *dev)
{
struct nameidata nd;
int rval = 0;
if (path_init(name, LOOKUP_FOLLOW, &nd))
rval = path_walk(name, &nd);
/* Watch out for negative dentries */
if (!nd.dentry->d_inode)
rval = -ENOENT;
if (rval)
printk("XFS: Invalid %s device [%s], err=%d\n", id, name, rval);
else
*dev = nd.dentry->d_inode->i_rdev;
path_release(&nd);
return rval;
}
/*
* Convert device special files to dev_t for data, log, realtime.
*/
int
spectodevs(
struct super_block *sb,
struct xfs_mount_args *args,
dev_t *ddevp,
dev_t *logdevp,
dev_t *rtdevp)
{
int rval = 0;
*ddevp = sb->s_dev;
if (args->logname[0])
rval = spectodev(args->logname, "log", logdevp);
else
*logdevp = sb->s_dev;
if (args->rtname[0] && !rval)
rval = spectodev(args->rtname, "realtime", rtdevp);
else
*rtdevp = 0;
return rval;
}
static kmem_cache_t * linvfs_inode_cachep;
static __inline__ unsigned int gfp_mask(void)
{
/* If we're not in a transaction, FS activity is ok */
if (current->flags & PF_FSTRANS) return GFP_NOFS;
return GFP_KERNEL;
}
static struct inode *linvfs_alloc_inode(struct super_block *sb)
{
vnode_t *vp;
vp = (vnode_t *)kmem_cache_alloc(linvfs_inode_cachep, gfp_mask());
if (!vp)
return NULL;
return LINVFS_GET_IP(vp);
}
static void linvfs_destroy_inode(struct inode *inode)
{
kmem_cache_free(linvfs_inode_cachep, LINVFS_GET_VP(inode));
}
static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
vnode_t *vp = (vnode_t *)foo;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR)
inode_init_once(LINVFS_GET_IP(vp));
}
static int init_inodecache(void)
{
linvfs_inode_cachep = kmem_cache_create("linvfs_icache",
sizeof(vnode_t), 0, SLAB_HWCACHE_ALIGN,
init_once, NULL);
if (linvfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
if (kmem_cache_destroy(linvfs_inode_cachep))
printk(KERN_INFO "linvfs_inode_cache: not all structures were freed\n");
}
struct super_block *
linvfs_read_super(
struct super_block *sb,
void *data,
int silent)
{
vfs_t *vfsp;
vfsops_t *vfsops;
vnode_t *rootvp;
struct inode *ip;
struct xfs_mount_args *args;
struct statfs statvfs;
int error;
args = (struct xfs_mount_args *)kmalloc(sizeof(struct xfs_mount_args), GFP_KERNEL);
if (!args)
return NULL;
if (xfs_parseargs((char *)data, sb->s_flags, args))
goto out_null;
strncpy(args->fsname, bdevname(sb->s_dev), MAXNAMELEN);
/* args->rtdev and args->logdev done in xfs_parseargs */
/* Kludge in XFS until we have other VFS/VNODE FSs */
vfsops = &xfs_vfsops;
/* Set up the vfs_t structure */
vfsp = vfs_allocate();
if (!vfsp)
goto out_null;
if (sb->s_flags & MS_RDONLY)
vfsp->vfs_flag |= VFS_RDONLY;
vfsp->vfs_super = sb;
set_blocksize(sb->s_dev, BBSIZE);
set_max_bytes(sb);
set_quota_ops(sb);
sb->s_op = &linvfs_sops;
LINVFS_SET_VFS(sb, vfsp);
VFSOPS_MOUNT(vfsops, vfsp, args, NULL, error);
if (error)
goto fail_vfsop;
VFS_STATVFS(vfsp, &statvfs, NULL, error);
if (error)
goto fail_unmount;
sb->s_magic = XFS_SB_MAGIC;
sb->s_dirt = 1;
sb->s_blocksize = statvfs.f_bsize;
sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
VFS_ROOT(vfsp, &rootvp, error);
if (error)
goto fail_unmount;
ip = LINVFS_GET_IP(rootvp);
linvfs_revalidate_core(ip, ATTR_COMM);
sb->s_root = d_alloc_root(ip);
if (!sb->s_root)
goto fail_vnrele;
if (is_bad_inode(sb->s_root->d_inode))
goto fail_vnrele;
/* Don't set the VFS_DMI flag until here because we don't want
* to send events while replaying the log.
*/
if (args->flags & XFSMNT_DMAPI) {
vfsp->vfs_flag |= VFS_DMI;
VFSOPS_DMAPI_MOUNT(vfsops, vfsp, args->mtpt, args->fsname,
error);
if (error) {
if (atomic_read(&sb->s_active) == 1)
vfsp->vfs_flag &= ~VFS_DMI;
goto fail_vnrele;
}
}
set_posix_acl(sb);
vn_trace_exit(rootvp, "linvfs_read_super", (inst_t *)__return_address);
kfree(args);
return(sb);
fail_vnrele:
if (sb->s_root) {
dput(sb->s_root);
sb->s_root = NULL;
} else {
VN_RELE(rootvp);
}
fail_unmount:
VFS_UNMOUNT(vfsp, 0, NULL, error);
fail_vfsop:
vfs_deallocate(vfsp);
out_null:
kfree(args);
return(NULL);
}
void
linvfs_set_inode_ops(
struct inode *inode)
{
vnode_t *vp = LINVFS_GET_VP(inode);
inode->i_mode = VTTOIF(vp->v_type);
/* If this isn't a new inode, nothing to do */
if (!(inode->i_state & I_NEW))
return;
if (vp->v_type == VNON) {
make_bad_inode(inode);
} else if (S_ISREG(inode->i_mode)) {
inode->i_op = &linvfs_file_inode_operations;
inode->i_fop = &linvfs_file_operations;
inode->i_mapping->a_ops = &linvfs_aops;
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = &linvfs_dir_inode_operations;
inode->i_fop = &linvfs_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &linvfs_symlink_inode_operations;
if (inode->i_blocks)
inode->i_mapping->a_ops = &linvfs_aops;
} else {
inode->i_op = &linvfs_file_inode_operations;
init_special_inode(inode, inode->i_mode,
kdev_t_to_nr(inode->i_rdev));
}
unlock_new_inode(inode);
}
/*
* We do not actually write the inode here, just mark the
* super block dirty so that sync_supers calls us and
* forces the flush.
*/
void
linvfs_write_inode(
struct inode *inode,
int sync)
{
vnode_t *vp = LINVFS_GET_VP(inode);
int error;
if (vp) {
vn_trace_entry(vp, "linvfs_write_inode",
(inst_t *)__return_address);
VOP_IFLUSH(vp, error);
if (error == EAGAIN)
inode->i_sb->s_dirt = 1;
}
}
void
linvfs_clear_inode(
struct inode *inode)
{
vnode_t *vp = LINVFS_GET_VP(inode);
if (vp) {
vn_rele(vp);
vn_trace_entry(vp, "linvfs_clear_inode",
(inst_t *)__return_address);
/*
* Do all our cleanup, and remove this vnode.
*/
vp->v_flag |= VPURGE;
vn_remove(vp);
}
}
void
linvfs_put_inode(
struct inode *ip)
{
vnode_t *vp = LINVFS_GET_VP(ip);
int error;
if (vp && vp->v_fbhv && (atomic_read(&ip->i_count) == 1))
VOP_RELEASE(vp, error);
}
void
linvfs_put_super(
struct super_block *sb)
{
int error;
int sector_size = BBSIZE;
kdev_t dev = sb->s_dev;
vfs_t *vfsp = LINVFS_GET_VFS(sb);
VFS_DOUNMOUNT(vfsp, 0, NULL, NULL, error);
if (error) {
printk("XFS unmount got error %d\n", error);
printk("linvfs_put_super: vfsp/0x%p left dangling!\n", vfsp);
return;
}
vfs_deallocate(vfsp);
/* Reset device block size */
if (hardsect_size[MAJOR(dev)])
sector_size = hardsect_size[MAJOR(dev)][MINOR(dev)];
set_blocksize(dev, sector_size);
}
void
linvfs_write_super(
struct super_block *sb)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
sb->s_dirt = 0;
if (sb->s_flags & MS_RDONLY)
return;
VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_NOWAIT|SYNC_ATTR,
NULL, error);
}
int
linvfs_statfs(
struct super_block *sb,
struct statfs *statp)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
VFS_STATVFS(vfsp, statp, NULL, error);
return error;
}
int
linvfs_remount(
struct super_block *sb,
int *flags,
char *options)
{
struct xfs_mount_args *args;
vfs_t *vfsp;
xfs_mount_t *mp;
int error = 0;
args = (struct xfs_mount_args *)kmalloc(sizeof(struct xfs_mount_args), GFP_KERNEL);
if (!args)
return -ENOMEM;
vfsp = LINVFS_GET_VFS(sb);
mp = XFS_BHVTOM(vfsp->vfs_fbhv);
if (xfs_parseargs(options, *flags, args)) {
error = -EINVAL;
goto out;
}
set_posix_acl(sb);
if (args->flags & XFSMNT_NOATIME)
mp->m_flags |= XFS_MOUNT_NOATIME;
else
mp->m_flags &= ~XFS_MOUNT_NOATIME;
linvfs_write_super(sb);
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
goto out;
if (*flags & MS_RDONLY) {
sb->s_flags |= MS_RDONLY;
XFS_log_write_unmount_ro(vfsp->vfs_fbhv);
vfsp->vfs_flag |= VFS_RDONLY;
} else {
vfsp->vfs_flag &= ~VFS_RDONLY;
}
out:
kfree(args);
return error;
}
void
linvfs_freeze_fs(
struct super_block *sb)
{
vfs_t *vfsp;
vnode_t *vp;
int error;
vfsp = LINVFS_GET_VFS(sb);
if (sb->s_flags & MS_RDONLY)
return;
VFS_ROOT(vfsp, &vp, error);
VOP_IOCTL(vp, LINVFS_GET_IP(vp), NULL, XFS_IOC_FREEZE, 0, error);
VN_RELE(vp);
}
void
linvfs_unfreeze_fs(
struct super_block *sb)
{
vfs_t *vfsp;
vnode_t *vp;
int error;
vfsp = LINVFS_GET_VFS(sb);
VFS_ROOT(vfsp, &vp, error);
VOP_IOCTL(vp, LINVFS_GET_IP(vp), NULL, XFS_IOC_THAW, 0, error);
VN_RELE(vp);
}
STATIC int linvfs_dentry_to_fh(
struct dentry *dentry,
__u32 *data,
int *lenp,
int need_parent)
{
struct inode *inode = dentry->d_inode ;
vnode_t *vp = LINVFS_GET_VP(inode);
int maxlen = *lenp;
xfs_fid2_t fid;
int error;
if (maxlen < 3)
return 255 ;
VOP_FID2(vp, (struct fid *)&fid, error);
data[0] = (__u32)fid.fid_ino; /* 32 bits of inode is OK */
data[1] = fid.fid_gen;
*lenp = 2 ;
if (maxlen < 4 || ! need_parent)
return 2 ;
inode = dentry->d_parent->d_inode ;
vp = LINVFS_GET_VP(inode);
VOP_FID2(vp, (struct fid *)&fid, error);
data[2] = (__u32)fid.fid_ino; /* 32 bits of inode is OK */
*lenp = 3 ;
if (maxlen < 4)
return 3 ;
data[3] = fid.fid_gen;
*lenp = 4 ;
return 4 ;
}
STATIC struct dentry *linvfs_fh_to_dentry(
struct super_block *sb,
__u32 *data,
int len,
int fhtype,
int parent)
{
vnode_t *vp;
struct inode *inode = NULL;
struct list_head *lp;
struct dentry *result;
xfs_fid2_t xfid;
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
xfid.fid_len = sizeof(xfs_fid2_t) - sizeof(xfid.fid_len);
xfid.fid_pad = 0;
if (!parent) {
xfid.fid_gen = data[1];
xfid.fid_ino = (__u64)data[0];
} else {
if (fhtype == 4)
xfid.fid_gen = data[3];
else
xfid.fid_gen = 0;
xfid.fid_ino = (__u64)data[2];
}
VFS_VGET(vfsp, &vp, (fid_t *)&xfid, error);
if (error || vp == NULL)
return ERR_PTR(-ESTALE) ;
inode = LINVFS_GET_IP(vp);
spin_lock(&dcache_lock);
for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
result = list_entry(lp,struct dentry, d_alias);
if (! (result->d_flags & DCACHE_NFSD_DISCONNECTED)) {
dget_locked(result);
result->d_vfs_flags |= DCACHE_REFERENCED;
spin_unlock(&dcache_lock);
iput(inode);
return result;
}
}
spin_unlock(&dcache_lock);
result = d_alloc_root(inode);
if (result == NULL) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
result->d_flags |= DCACHE_NFSD_DISCONNECTED;
return result;
}
static struct super_operations linvfs_sops = {
.alloc_inode = linvfs_alloc_inode,
.destroy_inode = linvfs_destroy_inode,
.write_inode = linvfs_write_inode,
.put_inode = linvfs_put_inode,
.clear_inode = linvfs_clear_inode,
.put_super = linvfs_put_super,
.write_super = linvfs_write_super,
.write_super_lockfs = linvfs_freeze_fs,
.unlockfs = linvfs_unfreeze_fs,
.statfs = linvfs_statfs,
.remount_fs = linvfs_remount,
.fh_to_dentry = linvfs_fh_to_dentry,
.dentry_to_fh = linvfs_dentry_to_fh,
};
static struct file_system_type xfs_fs_type = {
.owner = THIS_MODULE,
.name = "xfs",
.read_super = linvfs_read_super,
.fs_flags = FS_REQUIRES_DEV,
};
static int __init init_xfs_fs(void)
{
int error;
struct sysinfo si;
static char message[] __initdata =
KERN_INFO "SGI XFS " XFS_VERSION_STRING " with "
XFS_BUILD_OPTIONS " enabled\n";
error = init_inodecache();
if (error < 0)
return error;
error = pagebuf_init();
if (error < 0)
goto out;
si_meminfo(&si);
xfs_physmem = si.totalram;
printk(message);
cred_init();
vn_init();
xfs_init(0);
dmapi_init();
error = register_filesystem(&xfs_fs_type);
if (error)
goto out;
return 0;
out:
destroy_inodecache();
return error;
}
static void __exit exit_xfs_fs(void)
{
dmapi_uninit();
xfs_cleanup();
unregister_filesystem(&xfs_fs_type);
pagebuf_terminate();
destroy_inodecache();
}
module_init(init_xfs_fs);
module_exit(exit_xfs_fs);
MODULE_AUTHOR("SGI <sgi.com>");
MODULE_DESCRIPTION("SGI XFS " XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
MODULE_LICENSE("GPL");
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