File: [Development] / xfs-linux / linux-2.4 / Attic / xfs_super.c (download)
Revision 1.318, Sat Dec 17 11:31:50 2005 UTC (11 years, 10 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.317: +5 -5
lines
Complete the pagebuf -> xfs_buf naming convention transition, finally.
Merge of xfs-linux-melb:xfs-kern:24866a by kenmcd.
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/*
* 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_bit.h"
#include "xfs_log.h"
#include "xfs_clnt.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.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_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir_sf.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_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_version.h"
#include "xfs_ioctl32.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 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;
if (sb->s_flags & MS_SYNCHRONOUS)
args->flags |= XFSMNT_WSYNC;
/* 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)
{
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &linvfs_file_inode_operations;
inode->i_fop = &linvfs_file_operations;
inode->i_mapping->a_ops = &linvfs_aops;
break;
case S_IFDIR:
inode->i_op = &linvfs_dir_inode_operations;
inode->i_fop = &linvfs_dir_operations;
break;
case S_IFLNK:
inode->i_op = &linvfs_symlink_inode_operations;
if (inode->i_blocks)
inode->i_mapping->a_ops = &linvfs_aops;
break;
default:
inode->i_op = &linvfs_file_inode_operations;
init_special_inode(inode, inode->i_mode,
kdev_t_to_nr(inode->i_rdev));
break;
}
}
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;
inode->i_nlink = ip->i_d.di_nlink;
inode->i_uid = ip->i_d.di_uid;
inode->i_gid = ip->i_d.di_gid;
switch (inode->i_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
inode->i_rdev = XFS_DEV_TO_KDEVT(ip->i_df.if_u2.if_rdev);
break;
default:
inode->i_rdev = NODEV;
break;
}
inode->i_blksize = xfs_preferred_iosize(mp);
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)) {
xfs_revalidate_inode(XFS_BHVTOM(bdp), vp, ip);
xfs_set_inodeops(inode);
ip->i_flags &= ~XFS_INEW;
barrier();
unlock_new_inode(inode);
}
}
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);
}
void
xfs_mountfs_check_barriers(xfs_mount_t *mp)
{
xfs_fs_cmn_err(CE_NOTE, mp,
"Write barriers not supported on Linux 2.4");
mp->m_flags &= ~XFS_MOUNT_BARRIER;
}
void
xfs_blkdev_issue_flush(
xfs_buftarg_t *buftarg)
{
}
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);
int error, cache;
vn_trace_entry(vp, "clear_inode", (inst_t *)__return_address);
XFS_STATS_INC(vn_rele);
XFS_STATS_INC(vn_remove);
XFS_STATS_INC(vn_reclaim);
XFS_STATS_DEC(vn_active);
/*
* This can happen because xfs_iget_core calls xfs_idestroy if we
* find an inode with di_mode == 0 but without IGET_CREATE set.
*/
if (vp->v_fbhv)
VOP_INACTIVE(vp, NULL, cache);
VN_LOCK(vp);
vp->v_flag &= ~VMODIFIED;
VN_UNLOCK(vp, 0);
if (vp->v_fbhv) {
VOP_RECLAIM(vp, error);
if (error)
panic("vn_purge: cannot reclaim");
}
ASSERT(vp->v_fbhv == NULL);
#ifdef XFS_VNODE_TRACE
ktrace_free(vp->v_trace);
#endif
}
/*
* 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);
/* Flush out everything to it's normal place */
VFS_SYNC(vfsp, SYNC_QUIESCE, 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);
if (!(vfs->vfs_flag & VFS_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_quotasync(
struct super_block *sb,
int type)
{
struct vfs *vfsp = LINVFS_GET_VFS(sb);
int error;
VFS_QUOTACTL(vfsp, Q_XQUOTASYNC, 0, (caddr_t)NULL, 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 == USRQUOTA) ? Q_XGETQUOTA :
((type == GRPQUOTA) ? Q_XGETGQUOTA : Q_XGETPQUOTA);
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 == USRQUOTA) ? Q_XSETQLIM :
((type == GRPQUOTA) ? Q_XSETGQLIM : Q_XSETPQLIM);
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 = {
.quota_sync = linvfs_quotasync,
.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 = xfs_buf_init();
if (error < 0)
goto undo_buffers;
vn_init();
xfs_init();
uuid_init();
error = xfs_register_ioctl_converters();
if (error)
goto undo_register;
error = register_filesystem(&xfs_fs_type);
if (error)
goto undo_register;
XFS_DM_INIT(&xfs_fs_type);
return 0;
undo_register:
xfs_unregister_ioctl_converters();
xfs_buf_terminate();
undo_buffers:
destroy_inodecache();
undo_inodecache:
return error;
}
STATIC void __exit
exit_xfs_fs( void )
{
XFS_DM_EXIT(&xfs_fs_type);
unregister_filesystem(&xfs_fs_type);
xfs_unregister_ioctl_converters();
xfs_cleanup();
xfs_buf_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");
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