struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
int type,
u32 slot)
{
struct inode *inode = NULL;
struct inode **arr = NULL;
/* avoid the lookup if cached in local system file array */
if (is_in_system_inode_array(osb, type, slot))
arr = &(osb->system_inodes[type]);
if (arr && ((inode = *arr) != NULL)) {
/* get a ref in addition to the array ref */
inode = igrab(inode);
BUG_ON(!inode);
return inode;
}
/* this gets one ref thru iget */
inode = _ocfs2_get_system_file_inode(osb, type, slot);
/* add one more if putting into array for first time */
if (arr && inode) {
*arr = igrab(inode);
BUG_ON(!*arr);
}
return inode;
}
/*
* If we're not journaling and this is a just-created file, we have to
* sync our parent directory (if it was freshly created) since
* otherwise it will only be written by writeback, leaving a huge
* window during which a crash may lose the file. This may apply for
* the parent directory's parent as well, and so on recursively, if
* they are also freshly created.
*/
static int ext4_sync_parent(struct inode *inode)
{
struct writeback_control wbc;
struct dentry *dentry = NULL;
struct inode *next;
int ret = 0;
if (!ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
return 0;
inode = igrab(inode);
while (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
dentry = d_find_any_alias(inode);
if (!dentry)
break;
next = igrab(dentry->d_parent->d_inode);
dput(dentry);
if (!next)
break;
iput(inode);
inode = next;
ret = sync_mapping_buffers(inode->i_mapping);
if (ret)
break;
memset(&wbc, 0, sizeof(wbc));
wbc.sync_mode = WB_SYNC_ALL;
wbc.nr_to_write = 0; /* only write out the inode */
ret = sync_inode(inode, &wbc);
if (ret)
break;
}
iput(inode);
return ret;
}
/*
* If we're not journaling and this is a just-created file, we have to
* sync our parent directory (if it was freshly created) since
* otherwise it will only be written by writeback, leaving a huge
* window during which a crash may lose the file. This may apply for
* the parent directory's parent as well, and so on recursively, if
* they are also freshly created.
*/
static int ext4_sync_parent(struct inode *inode)
{
struct dentry *dentry = NULL;
struct inode *next;
int ret = 0;
if (!ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
return 0;
inode = igrab(inode);
while (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
dentry = d_find_any_alias(inode);
if (!dentry)
break;
next = igrab(dentry->d_parent->d_inode);
dput(dentry);
if (!next)
break;
iput(inode);
inode = next;
ret = sync_mapping_buffers(inode->i_mapping);
if (ret)
break;
ret = sync_inode_metadata(inode, 1);
if (ret)
break;
}
iput(inode);
return ret;
}
/* like interpose above, but for an already existing dentry */
void unionfs_reinterpose(struct dentry *dentry)
{
struct dentry *lower_dentry;
struct inode *inode;
int bindex, bstart, bend;
verify_locked(dentry);
/* This is pre-allocated inode */
inode = dentry->d_inode;
bstart = dbstart(dentry);
bend = dbend(dentry);
for (bindex = bstart; bindex <= bend; bindex++) {
lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
if (!lower_dentry)
continue;
if (!lower_dentry->d_inode)
continue;
if (unionfs_lower_inode_idx(inode, bindex))
continue;
unionfs_set_lower_inode_idx(inode, bindex,
igrab(lower_dentry->d_inode));
}
ibstart(inode) = dbstart(dentry);
ibend(inode) = dbend(dentry);
}
STATIC int
xfs_vn_link(
struct dentry *old_dentry,
struct inode *dir,
struct dentry *dentry)
{
struct inode *inode; /* inode of guy being linked to */
struct xfs_name name;
int error;
inode = old_dentry->d_inode;
xfs_dentry_to_name(&name, dentry);
igrab(inode);
error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
if (unlikely(error)) {
iput(inode);
return -error;
}
xfs_iflags_set(XFS_I(dir), XFS_IMODIFIED);
xfs_validate_fields(inode);
d_instantiate(dentry, inode);
return 0;
}
int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
return 0;
spin_lock(&nilfs->ns_inode_lock);
if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
!test_bit(NILFS_I_BUSY, &ii->i_state)) {
if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
nilfs_warning(inode->i_sb, __func__,
"cannot get inode (ino=%lu)\n",
inode->i_ino);
spin_unlock(&nilfs->ns_inode_lock);
return -EINVAL;
}
list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
set_bit(NILFS_I_QUEUED, &ii->i_state);
}
spin_unlock(&nilfs->ns_inode_lock);
return 0;
}
/* must be called with pag_ici_lock held and releases it */
int
xfs_sync_inode_valid(
struct xfs_inode *ip,
struct xfs_perag *pag)
{
struct inode *inode = VFS_I(ip);
int error = EFSCORRUPTED;
/* nothing to sync during shutdown */
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
goto out_unlock;
/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
error = ENOENT;
if (xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
goto out_unlock;
/* If we can't grab the inode, it must on it's way to reclaim. */
if (!igrab(inode))
goto out_unlock;
if (is_bad_inode(inode)) {
IRELE(ip);
goto out_unlock;
}
/* inode is valid */
error = 0;
out_unlock:
read_unlock(&pag->pag_ici_lock);
return error;
}
static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
{
struct inode *inode;
inode = user_dlm_inode_from_user_lockres(lockres);
if (!igrab(inode))
BUG();
}
int
dm_path_to_fshdl(
char *path, /* any path name */
void *hanp, /* user's data buffer */
size_t *hlenp) /* set to size of data copied */
{
/* REFERENCED */
dm_fsreg_t *fsrp;
xfs_handle_t handle;
vnode_t *vp;
size_t hlen;
int error;
int lc; /* lock cookie */
struct nameidata nd;
struct inode *inode;
size_t len;
char *name;
/* XXX get things straightened out so getname() works here? */
len = strnlen_user(path, 2000);
name = kmem_alloc(len, KM_SLEEP);
if (copy_from_user(name, path, len))
return(EFAULT);
error = 0;
if (path_init(name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &nd))
error = path_walk(name, &nd);
if (error)
return error;
kmem_free(name, len);
ASSERT(nd.dentry);
ASSERT(nd.dentry->d_inode);
inode = igrab(nd.dentry->d_inode);
path_release(&nd);
/* we need the vnode */
vp = LINVFS_GET_VP(inode);
if (!vp || !vp->v_vfsp->vfs_altfsid) {
/* we're not in XFS anymore, Toto */
iput(inode);
return EINVAL;
}
error = dm_vp_to_handle(vp, &handle);
iput(inode);/*was VN_RELE(vp);*/
if (error)
return(error);
if ((fsrp = dm_find_fsreg_and_lock((fsid_t*)&handle.ha_fsid, &lc)) == NULL)
return(EBADF);
mutex_spinunlock(&fsrp->fr_lock, lc);
hlen = FSHSIZE;
if(copy_to_user(hanp, &handle, (int)hlen))
return(EFAULT);
return(put_user(hlen,hlenp));
}
/*
* Insert a write request into an inode
*/
static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
{
struct nfs_inode *nfsi = NFS_I(inode);
int error;
error = radix_tree_preload(GFP_NOFS);
if (error != 0)
goto out;
/* Lock the request! */
nfs_lock_request_dontget(req);
spin_lock(&inode->i_lock);
error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
BUG_ON(error);
if (!nfsi->npages) {
igrab(inode);
if (nfs_have_delegation(inode, FMODE_WRITE))
nfsi->change_attr++;
}
SetPagePrivate(req->wb_page);
set_page_private(req->wb_page, (unsigned long)req);
nfsi->npages++;
kref_get(&req->wb_kref);
radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
NFS_PAGE_TAG_LOCKED);
spin_unlock(&inode->i_lock);
radix_tree_preload_end();
out:
return error;
}
/*
* Look up an entry in a directory.
*
* NOTE: '.' and '..' are handled as special cases because
* no directory entries are actually stored for them. If this is
* the root of a filesystem, then '.zfs' is also treated as a
* special pseudo-directory.
*/
int
zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags,
int *deflg, pathname_t *rpnp)
{
zfs_dirlock_t *dl;
znode_t *zp;
int error = 0;
uint64_t parent;
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
*ipp = ZTOI(dzp);
igrab(*ipp);
} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
zfs_sb_t *zsb = ZTOZSB(dzp);
/*
* If we are a snapshot mounted under .zfs, return
* the vp for the snapshot directory.
*/
if ((error = sa_lookup(dzp->z_sa_hdl,
SA_ZPL_PARENT(zsb), &parent, sizeof (parent))) != 0)
return (error);
#ifdef HAVE_SNAPSHOT
if (parent == dzp->z_id && zsb->z_parent != zsb) {
error = zfsctl_root_lookup(zsb->z_parent->z_ctldir,
"snapshot", ipp, NULL, 0, NULL, kcred,
NULL, NULL, NULL);
return (error);
}
#endif /* HAVE_SNAPSHOT */
rw_enter(&dzp->z_parent_lock, RW_READER);
error = zfs_zget(zsb, parent, &zp);
if (error == 0)
*ipp = ZTOI(zp);
rw_exit(&dzp->z_parent_lock);
#ifdef HAVE_SNAPSHOT
} else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
*ipp = zfsctl_root(dzp);
#endif /* HAVE_SNAPSHOT */
} else {
int zf;
zf = ZEXISTS | ZSHARED;
if (flags & FIGNORECASE)
zf |= ZCILOOK;
error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
if (error == 0) {
*ipp = ZTOI(zp);
zfs_dirent_unlock(dl);
dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
}
rpnp = NULL;
}
if ((flags & FIGNORECASE) && rpnp && !error)
(void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
return (error);
}
static struct inode *dlmfs_get_inode(struct inode *parent,
struct dentry *dentry,
int mode)
{
struct super_block *sb = parent->i_sb;
struct inode * inode = new_inode(sb);
struct dlmfs_inode_private *ip;
if (!inode)
return NULL;
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
ip = DLMFS_I(inode);
ip->ip_conn = DLMFS_I(parent)->ip_conn;
switch (mode & S_IFMT) {
default:
/* for now we don't support anything other than
* directories and regular files. */
BUG();
break;
case S_IFREG:
inode->i_op = &dlmfs_file_inode_operations;
inode->i_fop = &dlmfs_file_operations;
i_size_write(inode, DLM_LVB_LEN);
user_dlm_lock_res_init(&ip->ip_lockres, dentry);
/* released at clear_inode time, this insures that we
* get to drop the dlm reference on each lock *before*
* we call the unregister code for releasing parent
* directories. */
ip->ip_parent = igrab(parent);
BUG_ON(!ip->ip_parent);
break;
case S_IFDIR:
inode->i_op = &dlmfs_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink ==
* 2 (for "." entry) */
inc_nlink(inode);
break;
}
if (parent->i_mode & S_ISGID) {
inode->i_gid = parent->i_gid;
if (S_ISDIR(mode))
inode->i_mode |= S_ISGID;
}
return inode;
}
/*
* Given a root znode, retrieve the associated .zfs directory.
* Add a hold to the vnode and return it.
*/
struct inode *
zfsctl_root(znode_t *zp)
{
ASSERT(zfs_has_ctldir(zp));
igrab(ZTOZSB(zp)->z_ctldir);
return (ZTOZSB(zp)->z_ctldir);
}
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
struct inode *ip = old_dentry->d_inode;
int error;
if (ip->i_nlink >= ZFS_LINK_MAX)
return -EMLINK;
crhold(cr);
ip->i_ctime = CURRENT_TIME_SEC;
igrab(ip); /* Use ihold() if available */
error = -zfs_link(dir, ip, dname(dentry), cr);
if (error) {
iput(ip);
goto out;
}
d_instantiate(dentry, ip);
out:
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
return 0;
spin_lock(&nilfs->ns_inode_lock);
if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
!test_bit(NILFS_I_BUSY, &ii->i_state)) {
/* Because this routine may race with nilfs_dispose_list(),
we have to check NILFS_I_QUEUED here, too. */
if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
/* This will happen when somebody is freeing
this inode. */
nilfs_warning(inode->i_sb, __func__,
"cannot get inode (ino=%lu)\n",
inode->i_ino);
spin_unlock(&nilfs->ns_inode_lock);
return -EINVAL; /* NILFS_I_DIRTY may remain for
freeing inode */
}
list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
set_bit(NILFS_I_QUEUED, &ii->i_state);
}
spin_unlock(&nilfs->ns_inode_lock);
return 0;
}
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
struct inode *ip = old_dentry->d_inode;
int error;
fstrans_cookie_t cookie;
if (ip->i_nlink >= ZFS_LINK_MAX)
return (-EMLINK);
crhold(cr);
ip->i_ctime = CURRENT_TIME_SEC;
igrab(ip); /* Use ihold() if available */
cookie = spl_fstrans_mark();
error = -zfs_link(dir, ip, dname(dentry), cr);
if (error) {
VN_RELE(ip);
goto out;
}
d_instantiate(dentry, ip);
out:
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
/**
* write_page_by_ent - ask entd thread to flush this page as part of slum
* @page: page to be written
* @wbc: writeback control passed to reiser4_writepage
*
* Creates a request, puts it on entd list of requests, wakeups entd if
* necessary, waits until entd completes with the request.
*/
int write_page_by_ent(struct page *page, struct writeback_control *wbc)
{
struct super_block *sb;
struct inode *inode;
entd_context *ent;
struct wbq rq;
assert("", PageLocked(page));
assert("", page->mapping != NULL);
sb = page->mapping->host->i_sb;
ent = get_entd_context(sb);
assert("", ent && ent->done == 0);
/*
* we are going to unlock page and ask ent thread to write the
* page. Re-dirty page before unlocking so that if ent thread fails to
* write it - it will remain dirty
*/
set_page_dirty_notag(page);
/*
* pin inode in memory, unlock page, entd_flush will iput. We can not
* iput here becasue we can not allow delete_inode to be called here
*/
inode = igrab(page->mapping->host);
unlock_page(page);
if (inode == NULL)
/* inode is getting freed */
return 0;
/* init wbq */
INIT_LIST_HEAD(&rq.link);
rq.magic = WBQ_MAGIC;
rq.wbc = wbc;
rq.page = page;
rq.mapping = inode->i_mapping;
rq.node = NULL;
rq.written = 0;
init_completion(&rq.completion);
/* add request to entd's list of writepage requests */
spin_lock(&ent->guard);
ent->nr_todo_reqs++;
list_add_tail(&rq.link, &ent->todo_list);
if (ent->nr_todo_reqs == 1)
wake_up_process(ent->tsk);
spin_unlock(&ent->guard);
/* wait until entd finishes */
wait_for_completion(&rq.completion);
if (rq.written)
/* Eventually ENTD has written the page to disk. */
return 0;
return 0;
}
struct inode *unionfs_igrab(struct inode *inode, int line, char *file)
{
atomic_inc(&unionfs_iget_counter);
if (inode)
atomic_inc(&unionfs_igets_outstanding);
printk("IR:%d:%d:%d:%p:%d:%s\n", atomic_read(&unionfs_iget_counter),
atomic_read(&unionfs_igets_outstanding),
inode ? atomic_read(&inode->i_count) : 0, inode, line, file);
return igrab(inode);
}
static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
{
struct inode *inode = file->f_dentry->d_inode;
struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_mds_request *req;
struct ceph_ioctl_layout l;
int err, i;
/* copy and validate */
if (copy_from_user(&l, arg, sizeof(l)))
return -EFAULT;
if ((l.object_size & ~PAGE_MASK) ||
(l.stripe_unit & ~PAGE_MASK) ||
!l.stripe_unit ||
(l.object_size &&
(unsigned)l.object_size % (unsigned)l.stripe_unit))
return -EINVAL;
/* make sure it's a valid data pool */
if (l.data_pool > 0) {
mutex_lock(&mdsc->mutex);
err = -EINVAL;
for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
err = 0;
break;
}
mutex_unlock(&mdsc->mutex);
if (err)
return err;
}
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = igrab(inode);
req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
req->r_args.setlayout.layout.fl_stripe_unit =
cpu_to_le32(l.stripe_unit);
req->r_args.setlayout.layout.fl_stripe_count =
cpu_to_le32(l.stripe_count);
req->r_args.setlayout.layout.fl_object_size =
cpu_to_le32(l.object_size);
req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
req->r_args.setlayout.layout.fl_pg_preferred =
cpu_to_le32(l.preferred_osd);
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
ceph_mdsc_put_request(req);
return err;
}
/* set lower inode ptr and update bstart & bend if necessary */
static void __set_inode(struct dentry *upper, struct dentry *lower,
int bindex)
{
unionfs_set_lower_inode_idx(upper->d_inode, bindex,
igrab(lower->d_inode));
if (likely(ibstart(upper->d_inode) > bindex))
ibstart(upper->d_inode) = bindex;
if (likely(ibend(upper->d_inode) < bindex))
ibend(upper->d_inode) = bindex;
}
int filter_log_sz_change(struct llog_handle *cathandle,
struct ll_fid *mds_fid,
__u32 ioepoch,
struct llog_cookie *logcookie,
struct inode *inode)
{
struct llog_size_change_rec *lsc;
int rc;
struct ost_filterdata *ofd;
ENTRY;
LOCK_INODE_MUTEX(inode);
ofd = INODE_PRIVATE_DATA(inode);
if (ofd && ofd->ofd_epoch >= ioepoch) {
if (ofd->ofd_epoch > ioepoch)
CERROR("client sent old epoch %d for obj ino %ld\n",
ioepoch, inode->i_ino);
UNLOCK_INODE_MUTEX(inode);
RETURN(0);
}
if (ofd && ofd->ofd_epoch < ioepoch) {
ofd->ofd_epoch = ioepoch;
} else if (!ofd) {
OBD_ALLOC(ofd, sizeof(*ofd));
if (!ofd)
GOTO(out, rc = -ENOMEM);
igrab(inode);
INODE_PRIVATE_DATA(inode) = ofd;
ofd->ofd_epoch = ioepoch;
}
/* the decision to write a record is now made, unlock */
UNLOCK_INODE_MUTEX(inode);
OBD_ALLOC(lsc, sizeof(*lsc));
if (lsc == NULL)
RETURN(-ENOMEM);
lsc->lsc_hdr.lrh_len = lsc->lsc_tail.lrt_len = sizeof(*lsc);
lsc->lsc_hdr.lrh_type = OST_SZ_REC;
lsc->lsc_fid = *mds_fid;
lsc->lsc_ioepoch = ioepoch;
rc = llog_cat_add_rec(cathandle, &lsc->lsc_hdr, logcookie, NULL);
OBD_FREE(lsc, sizeof(*lsc));
if (rc > 0) {
LASSERT(rc == sizeof(*logcookie));
rc = 0;
}
out:
RETURN(rc);
}
/*
* convert connectable fh to dentry
*/
static struct dentry *__cfh_to_dentry(struct super_block *sb,
struct ceph_nfs_confh *cfh)
{
struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
struct inode *inode;
struct dentry *dentry;
struct ceph_vino vino;
int err;
dout("__cfh_to_dentry %llx (%llx/%x)\n",
cfh->ino, cfh->parent_ino, cfh->parent_name_hash);
vino.ino = cfh->ino;
vino.snap = CEPH_NOSNAP;
inode = ceph_find_inode(sb, vino);
if (!inode) {
struct ceph_mds_request *req;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPHASH,
USE_ANY_MDS);
if (IS_ERR(req))
return ERR_CAST(req);
req->r_ino1 = vino;
req->r_ino2.ino = cfh->parent_ino;
req->r_ino2.snap = CEPH_NOSNAP;
req->r_path2 = kmalloc(16, GFP_NOFS);
snprintf(req->r_path2, 16, "%d", cfh->parent_name_hash);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
inode = req->r_target_inode;
if (inode)
igrab(inode);
ceph_mdsc_put_request(req);
if (!inode)
return ERR_PTR(err ? err : -ESTALE);
}
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
pr_err("cfh_to_dentry %llx -- inode %p but ENOMEM\n",
cfh->ino, inode);
iput(inode);
return dentry;
}
err = ceph_init_dentry(dentry);
if (err < 0) {
iput(inode);
return ERR_PTR(err);
}
dout("__cfh_to_dentry %llx %p dentry %p\n", cfh->ino, inode, dentry);
return dentry;
}
/*
* Write an mmapped page to the server.
*/
int
nfs_writepage(struct page *page)
{
struct inode *inode = page->mapping->host;
unsigned long end_index;
unsigned offset = PAGE_CACHE_SIZE;
int inode_referenced = 0;
int err;
/*
* Note: We need to ensure that we have a reference to the inode
* if we are to do asynchronous writes. If not, waiting
* in nfs_wait_on_request() may deadlock with clear_inode().
*
* If igrab() fails here, then it is in any case safe to
* call nfs_wb_page(), since there will be no pending writes.
*/
if (igrab(inode) != 0)
inode_referenced = 1;
end_index = inode->i_size >> PAGE_CACHE_SHIFT;
/* Ensure we've flushed out any previous writes */
nfs_wb_page(inode,page);
/* easy case */
if (page->index < end_index)
goto do_it;
/* things got complicated... */
offset = inode->i_size & (PAGE_CACHE_SIZE-1);
/* OK, are we completely out? */
err = -EIO;
if (page->index >= end_index+1 || !offset)
goto out;
do_it:
lock_kernel();
if (NFS_SERVER(inode)->wsize >= PAGE_CACHE_SIZE && !IS_SYNC(inode) &&
inode_referenced) {
err = nfs_writepage_async(NULL, inode, page, 0, offset);
if (err >= 0)
err = 0;
} else {
err = nfs_writepage_sync(NULL, inode, page, 0, offset);
if (err == offset)
err = 0;
}
unlock_kernel();
out:
UnlockPage(page);
if (inode_referenced)
iput(inode);
return err;
}
struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
{
struct sysfs_dirent *parent_sd = kobj->sd->s_parent;
struct dentry *dir, *parent, *shadow;
struct inode *inode;
struct sysfs_dirent *sd;
struct sysfs_addrm_cxt acxt;
dir = sysfs_get_dentry(kobj->sd);
if (IS_ERR(dir)) {
sd = (void *)dir;
goto out;
}
parent = dir->d_parent;
inode = dir->d_inode;
sd = ERR_PTR(-EINVAL);
if (!sysfs_is_shadowed_inode(inode))
goto out_dput;
shadow = d_alloc(parent, &dir->d_name);
if (!shadow)
goto nomem;
sd = sysfs_new_dirent("_SHADOW_", inode->i_mode, SYSFS_DIR);
if (!sd)
goto nomem;
sd->s_elem.dir.kobj = kobj;
sysfs_addrm_start(&acxt, parent_sd);
/* add but don't link into children list */
sysfs_add_one(&acxt, sd);
/* attach and instantiate dentry */
sysfs_attach_dentry(sd, shadow);
d_instantiate(shadow, igrab(inode));
inc_nlink(inode); /* tj: synchronization? */
sysfs_addrm_finish(&acxt);
dget(shadow); /* Extra count - pin the dentry in core */
goto out_dput;
nomem:
dput(shadow);
sd = ERR_PTR(-ENOMEM);
out_dput:
dput(dir);
out:
return sd;
}
/*
* When called with struct file pointer set to NULL, there is no way we could
* update file->private_data, but getting it stuck on openFileList provides a
* way to access it from cifs_fill_filedata and thereby set file->private_data
* from cifs_open.
*/
struct cifsFileInfo *
cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
struct file *file, struct vfsmount *mnt, unsigned int oflags)
{
int oplock = 0;
struct cifsFileInfo *pCifsFile;
struct cifsInodeInfo *pCifsInode;
struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
if (pCifsFile == NULL)
return pCifsFile;
if (oplockEnabled)
oplock = REQ_OPLOCK;
pCifsFile->netfid = fileHandle;
pCifsFile->pid = current->tgid;
pCifsFile->pInode = igrab(newinode);
pCifsFile->mnt = mnt;
pCifsFile->pfile = file;
pCifsFile->invalidHandle = false;
pCifsFile->closePend = false;
mutex_init(&pCifsFile->fh_mutex);
mutex_init(&pCifsFile->lock_mutex);
INIT_LIST_HEAD(&pCifsFile->llist);
atomic_set(&pCifsFile->count, 1);
slow_work_init(&pCifsFile->oplock_break, &cifs_oplock_break_ops);
write_lock(&GlobalSMBSeslock);
list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList);
pCifsInode = CIFS_I(newinode);
if (pCifsInode) {
/* if readable file instance put first in list*/
if (oflags & FMODE_READ)
list_add(&pCifsFile->flist, &pCifsInode->openFileList);
else
list_add_tail(&pCifsFile->flist,
&pCifsInode->openFileList);
if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
pCifsInode->clientCanCacheAll = true;
pCifsInode->clientCanCacheRead = true;
cFYI(1, "Exclusive Oplock inode %p", newinode);
} else if ((oplock & 0xF) == OPLOCK_READ)
pCifsInode->clientCanCacheRead = true;
}
write_unlock(&GlobalSMBSeslock);
file->private_data = pCifsFile;
return pCifsFile;
}
/*
* Add a reference to a referenced vnode.
*/
bhv_vnode_t *
vn_hold(
bhv_vnode_t *vp)
{
struct inode *inode;
XFS_STATS_INC(vn_hold);
inode = igrab(vn_to_inode(vp));
ASSERT(inode);
return vp;
}
static void unionfs_fill_inode(struct dentry *dentry,
struct inode *inode)
{
struct inode *lower_inode;
struct dentry *lower_dentry;
int bindex, bstart, bend;
bstart = dbstart(dentry);
bend = dbend(dentry);
for (bindex = bstart; bindex <= bend; bindex++) {
lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
if (!lower_dentry) {
unionfs_set_lower_inode_idx(inode, bindex, NULL);
continue;
}
/* Initialize the lower inode to the new lower inode. */
if (!lower_dentry->d_inode)
continue;
unionfs_set_lower_inode_idx(inode, bindex,
igrab(lower_dentry->d_inode));
}
ibstart(inode) = dbstart(dentry);
ibend(inode) = dbend(dentry);
/* Use attributes from the first branch. */
lower_inode = unionfs_lower_inode(inode);
/* Use different set of inode ops for symlinks & directories */
if (S_ISLNK(lower_inode->i_mode))
inode->i_op = &unionfs_symlink_iops;
else if (S_ISDIR(lower_inode->i_mode))
inode->i_op = &unionfs_dir_iops;
/* Use different set of file ops for directories */
if (S_ISDIR(lower_inode->i_mode))
inode->i_fop = &unionfs_dir_fops;
/* properly initialize special inodes */
if (S_ISBLK(lower_inode->i_mode) || S_ISCHR(lower_inode->i_mode) ||
S_ISFIFO(lower_inode->i_mode) || S_ISSOCK(lower_inode->i_mode))
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
/* all well, copy inode attributes */
unionfs_copy_attr_all(inode, lower_inode);
fsstack_copy_inode_size(inode, lower_inode);
}
static int get_parent_ino(struct inode *inode, nid_t *pino)
{
struct dentry *dentry;
inode = igrab(inode);
/* Alex - the following is equivalent to: dentry = d_find_any_alias(inode); */
dentry = NULL;
spin_lock(&inode->i_lock);
if (!list_empty(&inode->i_dentry)) {
dentry = list_first_entry(&inode->i_dentry,
struct dentry, d_alias);
dget(dentry);
}
/*
* If we're not journaling and this is a just-created file, we have to
* sync our parent directory (if it was freshly created) since
* otherwise it will only be written by writeback, leaving a huge
* window during which a crash may lose the file. This may apply for
* the parent directory's parent as well, and so on recursively, if
* they are also freshly created.
*/
static int ext4_sync_parent(struct inode *inode)
{
struct dentry *dentry = NULL;
struct inode *next;
int ret = 0;
if (!ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
return 0;
inode = igrab(inode);
while (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
dentry = d_find_any_alias(inode);
if (!dentry)
break;
next = igrab(d_inode(dentry->d_parent));
dput(dentry);
if (!next)
break;
iput(inode);
inode = next;
/*
* The directory inode may have gone through rmdir by now. But
* the inode itself and its blocks are still allocated (we hold
* a reference to the inode so it didn't go through
* ext4_evict_inode()) and so we are safe to flush metadata
* blocks and the inode.
*/
ret = sync_mapping_buffers(inode->i_mapping);
if (ret)
break;
ret = sync_inode_metadata(inode, 1);
if (ret)
break;
}
iput(inode);
return ret;
}
/*
* Add a reference to a referenced vnode.
*/
struct vnode *
vn_hold(
struct vnode *vp)
{
struct inode *inode;
XFS_STATS_INC(vn_hold);
VN_LOCK(vp);
inode = igrab(LINVFS_GET_IP(vp));
ASSERT(inode);
VN_UNLOCK(vp, 0);
return vp;
}
