File: [Development] / xfs-linux / linux-2.4 / Attic / xfs_super.c (download)
Revision 1.301, Wed Mar 2 00:47:52 2005 UTC (12 years, 7 months ago) by gnb.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.300: +73 -43
lines
Make XFS provide encoding and decoding callbacks from knfsd which encode
the fileid portion of the NFS filehandle differently than the default
functions. The new fileid formats allow filesystems mounted with "inode64"
to be exported over NFSv3 (and NFSv2 if you also use the "no_subtree_check"
export option). For filesystems without "inode64", the file handles are
binary compatible with the old ones, so it should be possible to upgrade a
server without unmounting clients.
Merge of xfs-linux-melb:xfs-kern:21686a by kenmcd.
Fix interaction between XFS with 64 bit inodes enabled and NFS.
|
/*
* Copyright (c) 2000-2004 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 "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_clnt.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_export.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_version.h"
#include <linux/init.h>
STATIC struct quotactl_ops linvfs_qops;
STATIC struct super_operations linvfs_sops;
STATIC kmem_zone_t *linvfs_inode_zone;
STATIC kmem_shaker_t xfs_inode_shaker;
STATIC struct xfs_mount_args *
xfs_args_allocate(
struct super_block *sb)
{
struct xfs_mount_args *args;
args = kmem_zalloc(sizeof(struct xfs_mount_args), KM_SLEEP);
args->logbufs = args->logbufsize = -1;
strncpy(args->fsname, bdevname(sb->s_dev), MAXNAMELEN);
/* Copy the already-parsed mount(2) flags we're interested in */
if (sb->s_flags & MS_NOATIME)
args->flags |= XFSMNT_NOATIME;
/* Default to 32 bit inodes on Linux all the time */
args->flags |= XFSMNT_32BITINODES;
return args;
}
__uint64_t
xfs_max_file_offset(
unsigned int blockshift)
{
unsigned int pagefactor = 1;
unsigned int bitshift = BITS_PER_LONG - 1;
/* Figure out maximum filesize, on Linux this can depend on
* the filesystem blocksize (on 32 bit platforms).
* __block_prepare_write does this in an [unsigned] long...
* page->index << (PAGE_CACHE_SHIFT - bbits)
* So, for page sized blocks (4K on 32 bit platforms),
* this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
* (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
* but for smaller blocksizes it is less (bbits = log2 bsize).
* Note1: get_block_t takes a long (implicit cast from above)
* Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
* can optionally convert the [unsigned] long from above into
* an [unsigned] long long.
*/
#if BITS_PER_LONG == 32
# if defined(CONFIG_LBD)
ASSERT(sizeof(sector_t) == 8);
pagefactor = PAGE_CACHE_SIZE;
bitshift = BITS_PER_LONG;
# else
pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
# endif
#endif
return (((__uint64_t)pagefactor) << bitshift) - 1;
}
STATIC __inline__ void
xfs_set_inodeops(
struct inode *inode)
{
vnode_t *vp = LINVFS_GET_VP(inode);
if (vp->v_type == VNON) {
vn_mark_bad(vp);
} 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));
}
}
STATIC __inline__ void
xfs_revalidate_inode(
xfs_mount_t *mp,
vnode_t *vp,
xfs_inode_t *ip)
{
struct inode *inode = LINVFS_GET_IP(vp);
inode->i_mode = (ip->i_d.di_mode & MODEMASK) | VTTOIF(vp->v_type);
inode->i_nlink = ip->i_d.di_nlink;
inode->i_uid = ip->i_d.di_uid;
inode->i_gid = ip->i_d.di_gid;
if (((1 << vp->v_type) & ((1<<VBLK) | (1<<VCHR))) == 0) {
inode->i_rdev = NODEV;
} else {
xfs_dev_t dev = ip->i_df.if_u2.if_rdev;
inode->i_rdev = XFS_DEV_TO_KDEVT(dev);
}
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_generation = ip->i_d.di_gen;
i_size_write(inode, ip->i_d.di_size);
inode->i_blocks =
XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
inode->i_atime = ip->i_d.di_atime.t_sec;
inode->i_mtime = ip->i_d.di_mtime.t_sec;
inode->i_ctime = ip->i_d.di_ctime.t_sec;
if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
inode->i_flags |= S_IMMUTABLE;
else
inode->i_flags &= ~S_IMMUTABLE;
if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
inode->i_flags |= S_APPEND;
else
inode->i_flags &= ~S_APPEND;
if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
inode->i_flags |= S_SYNC;
else
inode->i_flags &= ~S_SYNC;
if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
inode->i_flags |= S_NOATIME;
else
inode->i_flags &= ~S_NOATIME;
vp->v_flag &= ~VMODIFIED;
}
void
xfs_initialize_vnode(
bhv_desc_t *bdp,
vnode_t *vp,
bhv_desc_t *inode_bhv,
int unlock)
{
xfs_inode_t *ip = XFS_BHVTOI(inode_bhv);
struct inode *inode = LINVFS_GET_IP(vp);
if (!inode_bhv->bd_vobj) {
vp->v_vfsp = bhvtovfs(bdp);
bhv_desc_init(inode_bhv, ip, vp, &xfs_vnodeops);
bhv_insert(VN_BHV_HEAD(vp), inode_bhv);
}
/*
* We need to set the ops vectors, and unlock the inode, but if
* we have been called during the new inode create process, it is
* too early to fill in the Linux inode. We will get called a
* second time once the inode is properly set up, and then we can
* finish our work.
*/
if (ip->i_d.di_mode != 0 && unlock && (inode->i_state & I_NEW)) {
vp->v_type = IFTOVT(ip->i_d.di_mode);
xfs_revalidate_inode(XFS_BHVTOM(bdp), vp, ip);
xfs_set_inodeops(inode);
ip->i_flags &= ~XFS_INEW;
barrier();
unlock_new_inode(inode);
}
}
int
xfs_inode_shake(
int priority,
unsigned int gfp_mask)
{
int pages;
pages = kmem_zone_shrink(linvfs_inode_zone);
pages += kmem_zone_shrink(xfs_inode_zone);
return pages;
}
struct inode *
xfs_get_inode(
bhv_desc_t *bdp,
xfs_ino_t ino,
int flags)
{
struct vfs *vfsp = bhvtovfs(bdp);
return iget_locked(vfsp->vfs_super, ino);
}
struct dentry *
d_alloc_anon(struct inode *inode)
{
struct dentry *dentry;
spin_lock(&dcache_lock);
list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
if (!(dentry->d_flags & DCACHE_NFSD_DISCONNECTED))
goto found;
}
spin_unlock(&dcache_lock);
dentry = d_alloc_root(inode);
if (likely(dentry != NULL))
dentry->d_flags |= DCACHE_NFSD_DISCONNECTED;
return dentry;
found:
dget_locked(dentry);
dentry->d_vfs_flags |= DCACHE_REFERENCED;
spin_unlock(&dcache_lock);
iput(inode);
return dentry;
}
/*ARGSUSED*/
int
xfs_blkdev_get(
xfs_mount_t *mp,
const char *name,
struct block_device **bdevp)
{
struct nameidata nd;
int error;
error = path_lookup(name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &nd);
if (error) {
printk("XFS: Invalid device [%s], error=%d\n", name, error);
return -error;
}
/* I think we actually want bd_acquire here.. --hch */
*bdevp = bdget(kdev_t_to_nr(nd.dentry->d_inode->i_rdev));
if (*bdevp)
error = blkdev_get(*bdevp, FMODE_READ|FMODE_WRITE, 0, BDEV_FS);
else
error = -ENOMEM;
path_release(&nd);
return -error;
}
void
xfs_blkdev_put(
struct block_device *bdev)
{
if (bdev)
blkdev_put(bdev, BDEV_FS);
}
STATIC struct inode *
linvfs_alloc_inode(
struct super_block *sb)
{
vnode_t *vp;
vp = (vnode_t *)kmem_cache_alloc(linvfs_inode_zone,
kmem_flags_convert(KM_SLEEP));
if (!vp)
return NULL;
return LINVFS_GET_IP(vp);
}
STATIC void
linvfs_destroy_inode(
struct inode *inode)
{
kmem_cache_free(linvfs_inode_zone, LINVFS_GET_VP(inode));
}
#define VNODE_SIZE \
(sizeof(vnode_t) - sizeof(struct inode) + offsetof(struct inode, u))
STATIC void
init_once(
void *data,
kmem_cache_t *cachep,
unsigned long flags)
{
vnode_t *vp = (vnode_t *)data;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
struct inode *inode = LINVFS_GET_IP(vp);
memset(vp, 0, VNODE_SIZE);
__inode_init_once(inode);
}
}
STATIC int
init_inodecache( void )
{
linvfs_inode_zone = kmem_cache_create("linvfs_icache",
VNODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
init_once, NULL);
if (linvfs_inode_zone == NULL)
return -ENOMEM;
return 0;
}
STATIC void
destroy_inodecache( void )
{
if (kmem_cache_destroy(linvfs_inode_zone))
printk(KERN_WARNING "%s: cache still in use!\n", __FUNCTION__);
}
/*
* Attempt to flush the inode, this will actually fail
* if the inode is pinned, but we dirty the inode again
* at the point when it is unpinned after a log write,
* since this is when the inode itself becomes flushable.
*/
STATIC void
linvfs_write_inode(
struct inode *inode,
int sync)
{
vnode_t *vp = LINVFS_GET_VP(inode);
int error, flags = FLUSH_INODE;
if (vp) {
vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
if (sync)
flags |= FLUSH_SYNC;
VOP_IFLUSH(vp, flags, error);
if (error == EAGAIN) {
if (sync)
VOP_IFLUSH(vp, flags | FLUSH_LOG, error);
else
error = 0;
}
}
}
STATIC void
linvfs_clear_inode(
struct inode *inode)
{
vnode_t *vp = LINVFS_GET_VP(inode);
if (vp) {
vn_rele(vp);
vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
/*
* Do all our cleanup, and remove this vnode.
*/
vn_remove(vp);
}
}
/*
* Enqueue a work item to be picked up by the vfs xfssyncd thread.
* Doing this has two advantages:
* - It saves on stack space, which is tight in certain situations
* - It can be used (with care) as a mechanism to avoid deadlocks.
* Flushing while allocating in a full filesystem requires both.
*/
STATIC void
xfs_syncd_queue_work(
struct vfs *vfs,
void *data,
void (*syncer)(vfs_t *, void *))
{
vfs_sync_work_t *work;
work = kmem_alloc(sizeof(struct vfs_sync_work), KM_SLEEP);
INIT_LIST_HEAD(&work->w_list);
work->w_syncer = syncer;
work->w_data = data;
work->w_vfs = vfs;
spin_lock(&vfs->vfs_sync_lock);
list_add_tail(&work->w_list, &vfs->vfs_sync_list);
spin_unlock(&vfs->vfs_sync_lock);
wake_up_process(vfs->vfs_sync_task);
}
/*
* Flush delayed allocate data, attempting to free up reserved space
* from existing allocations. At this point a new allocation attempt
* has failed with ENOSPC and we are in the process of scratching our
* heads, looking about for more room...
*/
STATIC void
xfs_flush_inode_work(
vfs_t *vfs,
void *inode)
{
filemap_fdatawrite(((struct inode *)inode)->i_mapping);
iput((struct inode *)inode);
}
void
xfs_flush_inode(
xfs_inode_t *ip)
{
struct inode *inode = LINVFS_GET_IP(XFS_ITOV(ip));
struct vfs *vfs = XFS_MTOVFS(ip->i_mount);
igrab(inode);
xfs_syncd_queue_work(vfs, inode, xfs_flush_inode_work);
delay(HZ/2);
}
/*
* This is the "bigger hammer" version of xfs_flush_inode_work...
* (IOW, "If at first you don't succeed, use a Bigger Hammer").
*/
STATIC void
xfs_flush_device_work(
vfs_t *vfs,
void *inode)
{
fsync_no_super(((struct inode *)inode)->i_dev);
iput((struct inode *)inode);
}
void
xfs_flush_device(
xfs_inode_t *ip)
{
struct inode *inode = LINVFS_GET_IP(XFS_ITOV(ip));
struct vfs *vfs = XFS_MTOVFS(ip->i_mount);
igrab(inode);
xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);
delay(HZ/2);
xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
}
#define SYNCD_FLAGS (SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR|SYNC_REFCACHE)
STATIC void
vfs_sync_worker(
vfs_t *vfsp,
void *unused)
{
int error;
if (!(vfsp->vfs_flag & VFS_RDONLY))
VFS_SYNC(vfsp, SYNCD_FLAGS, NULL, error);
}
STATIC int
xfssyncd(
void *arg)
{
long timeleft;
vfs_t *vfsp = (vfs_t *) arg;
struct list_head tmp;
struct vfs_sync_work *work, *n;
daemonize();
reparent_to_init();
sigmask_lock();
sigfillset(¤t->blocked);
__recalc_sigpending(current);
sigmask_unlock();
sprintf(current->comm, "xfssyncd");
vfsp->vfs_sync_work.w_vfs = vfsp;
vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
vfsp->vfs_sync_task = current;
wmb();
wake_up(&vfsp->vfs_wait_sync_task);
INIT_LIST_HEAD(&tmp);
timeleft = (xfs_syncd_centisecs * HZ) / 100;
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
timeleft = schedule_timeout(timeleft);
if (vfsp->vfs_flag & VFS_UMOUNT)
break;
spin_lock(&vfsp->vfs_sync_lock);
if (!timeleft) {
timeleft = (xfs_syncd_centisecs * HZ) / 100;
INIT_LIST_HEAD(&vfsp->vfs_sync_work.w_list);
list_add_tail(&vfsp->vfs_sync_work.w_list,
&vfsp->vfs_sync_list);
}
list_for_each_entry_safe(work, n, &vfsp->vfs_sync_list, w_list)
list_move(&work->w_list, &tmp);
spin_unlock(&vfsp->vfs_sync_lock);
list_for_each_entry_safe(work, n, &tmp, w_list) {
(*work->w_syncer)(vfsp, work->w_data);
list_del(&work->w_list);
if (work == &vfsp->vfs_sync_work)
continue;
kmem_free(work, sizeof(struct vfs_sync_work));
}
}
vfsp->vfs_sync_task = NULL;
wmb();
wake_up(&vfsp->vfs_wait_sync_task);
return 0;
}
STATIC int
linvfs_start_syncd(
vfs_t *vfsp)
{
int pid;
pid = kernel_thread(xfssyncd, (void *) vfsp,
CLONE_VM | CLONE_FS | CLONE_FILES);
if (pid < 0)
return pid;
wait_event(vfsp->vfs_wait_sync_task, vfsp->vfs_sync_task);
return 0;
}
STATIC void
linvfs_stop_syncd(
vfs_t *vfsp)
{
vfsp->vfs_flag |= VFS_UMOUNT;
wmb();
wake_up_process(vfsp->vfs_sync_task);
wait_event(vfsp->vfs_wait_sync_task, !vfsp->vfs_sync_task);
}
STATIC void
linvfs_put_super(
struct super_block *sb)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
linvfs_stop_syncd(vfsp);
VFS_SYNC(vfsp, SYNC_ATTR|SYNC_DELWRI, NULL, error);
if (!error)
VFS_UNMOUNT(vfsp, 0, NULL, error);
if (error) {
printk("XFS unmount got error %d\n", error);
printk("%s: vfsp/0x%p left dangling!\n", __FUNCTION__, vfsp);
return;
}
vfs_deallocate(vfsp);
}
STATIC void
linvfs_write_super(
struct super_block *sb)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
if (sb->s_flags & MS_RDONLY) {
sb->s_dirt = 0; /* paranoia */
return;
}
/* Push the log and superblock a little */
VFS_SYNC(vfsp, SYNC_FSDATA, NULL, error);
sb->s_dirt = 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21)
STATIC int
linvfs_sync_super(
struct super_block *sb)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_WAIT, NULL, error);
sb->s_dirt = 0;
return -error;
}
#endif
STATIC 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;
}
STATIC int
linvfs_remount(
struct super_block *sb,
int *flags,
char *options)
{
vfs_t *vfsp = LINVFS_GET_VFS(sb);
struct xfs_mount_args *args = xfs_args_allocate(sb);
int error;
VFS_PARSEARGS(vfsp, options, args, 1, error);
if (!error)
VFS_MNTUPDATE(vfsp, flags, args, error);
kmem_free(args, sizeof(*args));
return -error;
}
struct super_block *freeze_bdev(struct block_device *bdev)
{
struct super_block *sb;
struct vfs *vfsp;
int error;
sb = get_super(to_kdev_t(bdev->bd_dev));
if (sb && !(sb->s_flags & MS_RDONLY)) {
vfsp = LINVFS_GET_VFS(sb);
/* Stop new writers */
vfsp->vfs_frozen = SB_FREEZE_WRITE;
wmb();
/* Flush the refcache */
VFS_SYNC(vfsp, SYNC_REFCACHE|SYNC_WAIT, NULL, error);
/* Flush delalloc and delwri data */
VFS_SYNC(vfsp, SYNC_DELWRI|SYNC_WAIT, NULL, error);
/* Pause transaction subsystem */
vfsp->vfs_frozen = SB_FREEZE_TRANS;
wmb();
/* Flush any remaining inodes into buffers */
VFS_SYNC(vfsp, SYNC_ATTR|SYNC_WAIT, NULL, error);
/* Push all buffers out to disk */
sync_buffers(sb->s_dev, 1);
/* Push the superblock and write an unmount record */
VFS_FREEZE(vfsp);
}
sync_buffers(to_kdev_t(bdev->bd_dev), 1);
return sb; /* thaw_bdev releases sb->s_umount */
}
void thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
if (sb) {
struct vfs *vfsp = LINVFS_GET_VFS(sb);
BUG_ON(sb->s_bdev != bdev);
vfsp->vfs_frozen = SB_UNFROZEN;
wmb();
wake_up(&vfsp->vfs_wait_unfrozen);
drop_super(sb);
}
}
STATIC void
linvfs_freeze_fs(
struct super_block *sb)
{
if (sb->s_flags & MS_RDONLY)
return;
freeze_bdev(sb->s_bdev);
}
STATIC void
linvfs_unfreeze_fs(
struct super_block *sb)
{
thaw_bdev(sb->s_bdev, sb);
}
/*
* XFS encodes and decodes the fileid portion of NFS filehandles
* itself instead of letting the generic NFS code do it. This
* was previously the case but now we use new fileid formats which
* allow filesystems with 64 bit inode numbers to be exported.
*
* Note a side effect of the new formats is that xfs_vget() won't
* be passed a zero inode/generation pair under normal circumstances.
* As however a malicious client could send us such data, the check
* remains in that code.
*/
STATIC int
linvfs_dentry_to_fh(
struct dentry *dentry,
__u32 *data,
int *lenp,
int need_parent)
{
struct inode *inode = dentry->d_inode;
int type = 2;
__u32 *p = data;
int len;
int is64 = 0;
#if XFS_BIG_INUMS
vfs_t *vfs = LINVFS_GET_VFS(inode->i_sb);
xfs_mount_t *mp = XFS_VFSTOM(vfs);
if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT)) {
/* filesystem may contain 64bit inode numbers */
is64 = XFS_FILEID_TYPE_64FLAG;
}
#endif
/*
* Only encode if there is enough space given. In practice
* this means we can't export a filesystem with 64bit inodes
* over NFSv2 with the subtree_check export option; the other
* seven combinations work. The real answer is "don't use v2".
*/
len = xfs_fileid_length(need_parent, is64);
if (*lenp < len)
return 255;
*lenp = len;
p = xfs_fileid_encode_inode(p, inode, is64);
if (need_parent) {
#ifdef HAVE_DPARENT_LOCK
read_lock(&dparent_lock);
#endif
p = xfs_fileid_encode_inode(p, dentry->d_parent->d_inode, is64);
#ifdef HAVE_DPARENT_LOCK
read_unlock(&dparent_lock);
#endif
type = 4;
}
if ((p - data) != len)
BUG();
return type | is64;
}
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 dentry *result;
xfs_fid2_t xfid;
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
int is64 = 0;
#if XFS_BIG_INUMS
is64 = (fhtype & XFS_FILEID_TYPE_64FLAG);
fhtype &= ~XFS_FILEID_TYPE_64FLAG;
#endif
/*
* Note that we only accept fileids which are long enough
* rather than allow the parent generation number to default
* to zero. XFS considers zero a valid generation number not
* an invalid/wildcard value. There's little point printk'ing
* a warning here as we don't have the client information
* which would make such a warning useful.
*/
if (fhtype > 2 ||
len < xfs_fileid_length((fhtype == 2), is64) ||
(parent && fhtype != 2))
return ERR_PTR(-ESTALE);
data = xfs_fileid_decode_fid2(data, &xfid, is64);
if (parent)
data = xfs_fileid_decode_fid2(data, &xfid, is64);
VFS_VGET(vfsp, &vp, (fid_t *)&xfid, error);
if (error || vp == NULL)
return ERR_PTR(-ESTALE) ;
inode = LINVFS_GET_IP(vp);
result = d_alloc_anon(inode);
if (unlikely(result == NULL)) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
STATIC int
linvfs_show_options(
struct seq_file *m,
struct vfsmount *mnt)
{
struct vfs *vfsp = LINVFS_GET_VFS(mnt->mnt_sb);
int error;
VFS_SHOWARGS(vfsp, m, error);
return error;
}
STATIC int
linvfs_getxstate(
struct super_block *sb,
struct fs_quota_stat *fqs)
{
struct vfs *vfsp = LINVFS_GET_VFS(sb);
int error;
VFS_QUOTACTL(vfsp, Q_XGETQSTAT, 0, (caddr_t)fqs, error);
return -error;
}
STATIC int
linvfs_setxstate(
struct super_block *sb,
unsigned int flags,
int op)
{
struct vfs *vfsp = LINVFS_GET_VFS(sb);
int error;
VFS_QUOTACTL(vfsp, op, 0, (caddr_t)&flags, error);
return -error;
}
STATIC int
linvfs_getxquota(
struct super_block *sb,
int type,
qid_t id,
struct fs_disk_quota *fdq)
{
struct vfs *vfsp = LINVFS_GET_VFS(sb);
int error, getmode;
getmode = (type == GRPQUOTA) ? Q_XGETGQUOTA : Q_XGETQUOTA;
VFS_QUOTACTL(vfsp, getmode, id, (caddr_t)fdq, error);
return -error;
}
STATIC int
linvfs_setxquota(
struct super_block *sb,
int type,
qid_t id,
struct fs_disk_quota *fdq)
{
struct vfs *vfsp = LINVFS_GET_VFS(sb);
int error, setmode;
setmode = (type == GRPQUOTA) ? Q_XSETGQLIM : Q_XSETQLIM;
VFS_QUOTACTL(vfsp, setmode, id, (caddr_t)fdq, error);
return -error;
}
STATIC struct super_block *
linvfs_read_super(
struct super_block *sb,
void *data,
int silent)
{
vnode_t *rootvp;
struct vfs *vfsp = vfs_allocate();
struct xfs_mount_args *args = xfs_args_allocate(sb);
struct statfs statvfs;
int error;
vfsp->vfs_super = sb;
LINVFS_SET_VFS(sb, vfsp);
if (sb->s_flags & MS_RDONLY)
vfsp->vfs_flag |= VFS_RDONLY;
bhv_insert_all_vfsops(vfsp);
VFS_PARSEARGS(vfsp, (char *)data, args, 0, error);
if (error) {
bhv_remove_all_vfsops(vfsp, 1);
goto fail_vfsop;
}
sb_min_blocksize(sb, BBSIZE);
sb->s_qcop = &linvfs_qops;
sb->s_op = &linvfs_sops;
VFS_MOUNT(vfsp, args, NULL, error);
if (error) {
bhv_remove_all_vfsops(vfsp, 1);
goto fail_vfsop;
}
VFS_STATVFS(vfsp, &statvfs, NULL, error);
if (error)
goto fail_unmount;
sb->s_dirt = 1;
sb->s_magic = statvfs.f_type;
sb->s_blocksize = statvfs.f_bsize;
sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
set_posix_acl_flag(sb);
VFS_ROOT(vfsp, &rootvp, error);
if (error)
goto fail_unmount;
sb->s_root = d_alloc_root(LINVFS_GET_IP(rootvp));
if (!sb->s_root)
goto fail_vnrele;
if (is_bad_inode(sb->s_root->d_inode))
goto fail_vnrele;
if (linvfs_start_syncd(vfsp))
goto fail_vnrele;
vn_trace_exit(rootvp, __FUNCTION__, (inst_t *)__return_address);
kmem_free(args, sizeof(*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);
kmem_free(args, sizeof(*args));
return NULL;
}
STATIC struct super_operations linvfs_sops = {
.alloc_inode = linvfs_alloc_inode,
.destroy_inode = linvfs_destroy_inode,
.write_inode = linvfs_write_inode,
.clear_inode = linvfs_clear_inode,
.put_super = linvfs_put_super,
.write_super = linvfs_write_super,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21)
.sync_fs = linvfs_sync_super,
#endif
.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,
.show_options = linvfs_show_options,
};
STATIC struct quotactl_ops linvfs_qops = {
.get_xstate = linvfs_getxstate,
.set_xstate = linvfs_setxstate,
.get_xquota = linvfs_getxquota,
.set_xquota = linvfs_setxquota,
};
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 \
XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";
printk(message);
si_meminfo(&si);
xfs_physmem = si.totalram;
ktrace_init(64);
error = init_inodecache();
if (error < 0)
goto undo_inodecache;
error = pagebuf_init();
if (error < 0)
goto undo_pagebuf;
vn_init();
xfs_init();
uuid_init();
xfs_inode_shaker = kmem_shake_register(xfs_inode_shake);
if (!xfs_inode_shaker) {
error = -ENOMEM;
goto undo_shaker;
}
error = register_filesystem(&xfs_fs_type);
if (error)
goto undo_register;
XFS_DM_INIT(&xfs_fs_type);
return 0;
undo_register:
kmem_shake_deregister(xfs_inode_shaker);
undo_shaker:
pagebuf_terminate();
undo_pagebuf:
destroy_inodecache();
undo_inodecache:
return error;
}
STATIC void __exit
exit_xfs_fs( void )
{
XFS_DM_EXIT(&xfs_fs_type);
unregister_filesystem(&xfs_fs_type);
kmem_shake_deregister(xfs_inode_shaker);
xfs_cleanup();
pagebuf_terminate();
destroy_inodecache();
ktrace_uninit();
}
module_init(init_xfs_fs);
module_exit(exit_xfs_fs);
MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
MODULE_LICENSE("GPL");
![[BACK]](/icons/back.gif){kind=icon}
Return to xfs_super.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / xfs-linux / linux-2.4