/*
** looks up the dentry of the parent directory for child.
** taken from ext2_get_parent
*/
struct dentry *reiserfs_get_parent(struct dentry *child)
{
int retval;
struct inode * inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH (path_to_entry);
struct dentry *parent;
struct inode *dir = child->d_inode ;
if (dir->i_nlink == 0) {
return ERR_PTR(-ENOENT);
}
de.de_gen_number_bit_string = NULL;
reiserfs_write_lock(dir->i_sb);
retval = reiserfs_find_entry (dir, "..", 2, &path_to_entry, &de);
pathrelse (&path_to_entry);
if (retval != NAME_FOUND) {
reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-ENOENT);
}
inode = reiserfs_iget (dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
reiserfs_write_unlock(dir->i_sb);
if (!inode || IS_ERR(inode)) {
return ERR_PTR(-EACCES);
}
parent = d_alloc_anon(inode);
if (!parent) {
iput(inode);
parent = ERR_PTR(-ENOMEM);
}
return parent;
}
static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_inum_host *inum = inum_obj;
struct inode *inode;
struct dentry *dentry;
inode = gfs2_ilookup(sb, inum->no_addr);
if (inode) {
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
iput(inode);
return ERR_PTR(-ESTALE);
}
} else {
inode = gfs2_lookup_by_inum(sdp, inum->no_addr,
&inum->no_formal_ino,
GFS2_BLKST_DINODE);
if (inode == ERR_PTR(-ENOENT))
inode = gfs2_ilookup(sb, inum->no_addr);
}
if (IS_ERR(inode))
return ERR_CAST(inode);
dentry = d_alloc_anon(inode);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
dentry->d_op = &gfs2_dops;
return dentry;
}
struct dentry *jfs_get_parent(struct dentry *dentry)
{
struct super_block *sb = dentry->d_inode->i_sb;
struct dentry *parent = ERR_PTR(-ENOENT);
struct inode *inode;
unsigned long parent_ino;
parent_ino =
le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
inode = iget(sb, parent_ino);
if (inode) {
if (is_bad_inode(inode)) {
iput(inode);
parent = ERR_PTR(-EACCES);
} else {
parent = d_alloc_anon(inode);
if (!parent) {
parent = ERR_PTR(-ENOMEM);
iput(inode);
}
}
}
return parent;
}
STATIC struct dentry *
xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fileid_type)
{
struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
struct inode *inode = NULL;
struct dentry *result;
switch (fileid_type) {
case FILEID_INO32_GEN_PARENT:
inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
fid->i32.parent_gen);
break;
case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
fid64->parent_gen);
break;
}
if (!inode)
return NULL;
if (IS_ERR(inode))
return ERR_PTR(PTR_ERR(inode));
result = d_alloc_anon(inode);
if (!result) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
static struct dentry *ocfs2_get_dentry(struct super_block *sb,
struct ocfs2_inode_handle *handle)
{
struct inode *inode;
struct dentry *result;
mlog_entry("(0x%p, 0x%p)\n", sb, handle);
if (handle->ih_blkno == 0) {
mlog_errno(-ESTALE);
return ERR_PTR(-ESTALE);
}
inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);
if (IS_ERR(inode))
return (void *)inode;
if (handle->ih_generation != inode->i_generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
result = d_alloc_anon(inode);
if (!result) {
iput(inode);
mlog_errno(-ENOMEM);
return ERR_PTR(-ENOMEM);
}
result->d_op = &ocfs2_dentry_ops;
mlog_exit_ptr(result);
return result;
}
struct dentry *efs_get_parent(struct dentry *child)
{
struct dentry *parent;
struct inode *inode;
efs_ino_t ino;
int error;
lock_kernel();
error = -ENOENT;
ino = efs_find_entry(child->d_inode, "..", 2);
if (!ino)
goto fail;
error = -EACCES;
inode = iget(child->d_inode->i_sb, ino);
if (!inode)
goto fail;
error = -ENOMEM;
parent = d_alloc_anon(inode);
if (!parent)
goto fail_iput;
unlock_kernel();
return parent;
fail_iput:
iput(inode);
fail:
unlock_kernel();
return ERR_PTR(error);
}
static struct dentry *
isofs_export_iget(struct super_block *sb,
unsigned long block,
unsigned long offset,
__u32 generation)
{
struct inode *inode;
struct dentry *result;
if (block == 0)
return ERR_PTR(-ESTALE);
inode = isofs_iget(sb, block, offset);
if (inode == NULL)
return ERR_PTR(-ENOMEM);
if (is_bad_inode(inode)
|| (generation && inode->i_generation != generation))
{
iput(inode);
return ERR_PTR(-ESTALE);
}
result = d_alloc_anon(inode);
if (!result) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
static struct dentry *fuse_get_dentry(struct super_block *sb, void *vobjp)
{
__u32 *objp = vobjp;
unsigned long nodeid = objp[0];
__u32 generation = objp[1];
struct inode *inode;
struct dentry *entry;
if (nodeid == 0)
return ERR_PTR(-ESTALE);
inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
if (!inode)
return ERR_PTR(-ESTALE);
if (inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
entry = d_alloc_anon(inode);
if (!entry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return entry;
}
/**
* ntfs_get_dentry - find a dentry for the inode from a file handle sub-fragment
* @sb: super block identifying the mounted ntfs volume
* @fh: the file handle sub-fragment
*
* Find a dentry for the inode given a file handle sub-fragment. This function
* is called from fs/exportfs/expfs.c::find_exported_dentry() which in turn is
* called from the default ->decode_fh() which is export_decode_fh() in the
* same file. The code is closely based on the default ->get_dentry() helper
* fs/exportfs/expfs.c::get_object().
*
* The @fh contains two 32-bit unsigned values, the first one is the inode
* number and the second one is the inode generation.
*
* Return the dentry on success or the error code on error (IS_ERR() is true).
*/
static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
{
struct inode *vi;
struct dentry *dent;
unsigned long ino = ((u32 *)fh)[0];
u32 gen = ((u32 *)fh)[1];
ntfs_debug("Entering for inode 0x%lx, generation 0x%x.", ino, gen);
vi = ntfs_iget(sb, ino);
if (IS_ERR(vi)) {
ntfs_error(sb, "Failed to get inode 0x%lx.", ino);
return (struct dentry *)vi;
}
if (unlikely(is_bad_inode(vi) || vi->i_generation != gen)) {
/* We didn't find the right inode. */
ntfs_error(sb, "Inode 0x%lx, bad count: %d %d or version 0x%x "
"0x%x.", vi->i_ino, vi->i_nlink,
atomic_read(&vi->i_count), vi->i_generation,
gen);
iput(vi);
return ERR_PTR(-ESTALE);
}
/* Now find a dentry. If possible, get a well-connected one. */
dent = d_alloc_anon(vi);
if (unlikely(!dent)) {
iput(vi);
return ERR_PTR(-ENOMEM);
}
ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
return dent;
}
STATIC struct dentry *
linvfs_get_dentry(
struct super_block *sb,
void *data)
{
vnode_t *vp;
struct inode *inode;
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;
xfid.fid_gen = ((__u32 *)data)[1];
xfid.fid_ino = ((__u32 *)data)[0];
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 (!result) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
STATIC struct dentry *
linvfs_get_parent(
struct dentry *child)
{
int error;
vnode_t *vp, *cvp;
struct dentry *parent;
struct inode *ip = NULL;
struct dentry dotdot;
dotdot.d_name.name = "..";
dotdot.d_name.len = 2;
dotdot.d_inode = 0;
cvp = NULL;
vp = LINVFS_GET_VP(child->d_inode);
VOP_LOOKUP(vp, &dotdot, &cvp, 0, NULL, NULL, error);
if (!error) {
ASSERT(cvp);
ip = LINVFS_GET_IP(cvp);
if (!ip) {
VN_RELE(cvp);
return ERR_PTR(-EACCES);
}
}
if (error)
return ERR_PTR(-error);
parent = d_alloc_anon(ip);
if (!parent) {
VN_RELE(cvp);
parent = ERR_PTR(-ENOMEM);
}
return parent;
}
static struct dentry *gfs2_get_parent(struct dentry *child)
{
struct qstr dotdot;
struct inode *inode;
struct dentry *dentry;
gfs2_str2qstr(&dotdot, "..");
inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
if (!inode)
return ERR_PTR(-ENOENT);
/*
* In case of an error, @inode carries the error value, and we
* have to return that as a(n invalid) pointer to dentry.
*/
if (IS_ERR(inode))
return ERR_PTR(PTR_ERR(inode));
dentry = d_alloc_anon(inode);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
dentry->d_op = &gfs2_dops;
return dentry;
}
static struct dentry *ocfs2_get_parent(struct dentry *child)
{
int status;
u64 blkno;
struct dentry *parent;
struct inode *inode;
struct inode *dir = child->d_inode;
struct buffer_head *dirent_bh = NULL;
struct ocfs2_dir_entry *dirent;
mlog_entry("(0x%p, '%.*s')\n", child,
child->d_name.len, child->d_name.name);
mlog(0, "find parent of directory %llu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno);
status = ocfs2_meta_lock(dir, NULL, 0);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
parent = ERR_PTR(status);
goto bail;
}
status = ocfs2_find_files_on_disk("..", 2, &blkno, dir, &dirent_bh,
&dirent);
if (status < 0) {
parent = ERR_PTR(-ENOENT);
goto bail_unlock;
}
inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
if (IS_ERR(inode)) {
mlog(ML_ERROR, "Unable to create inode %llu\n",
(unsigned long long)blkno);
parent = ERR_PTR(-EACCES);
goto bail_unlock;
}
parent = d_alloc_anon(inode);
if (!parent) {
iput(inode);
parent = ERR_PTR(-ENOMEM);
}
parent->d_op = &ocfs2_dentry_ops;
bail_unlock:
ocfs2_meta_unlock(dir, 0);
if (dirent_bh)
brelse(dirent_bh);
bail:
mlog_exit_ptr(parent);
return parent;
}
static struct dentry *
zpl_dentry_obtain_alias(struct inode *ip)
{
struct dentry *result;
#ifdef HAVE_D_OBTAIN_ALIAS
result = d_obtain_alias(ip);
#else
result = d_alloc_anon(ip);
if (result == NULL) {
iput(ip);
result = ERR_PTR(-ENOMEM);
}
#endif /* HAVE_D_OBTAIN_ALIAS */
return result;
}
static struct dentry *export_iget(struct super_block *sb, unsigned long ino, __u32 generation)
{
/* iget isn't really right if the inode is currently unallocated!!
* This should really all be done inside each filesystem
*
* ext2fs' read_inode has been strengthed to return a bad_inode if
* the inode had been deleted.
*
* Currently we don't know the generation for parent directory, so
* a generation of 0 means "accept any"
*/
struct inode *inode;
struct dentry *result;
if (ino == 0)
return ERR_PTR(-ESTALE);
inode = iget(sb, ino);
if (inode == NULL)
return ERR_PTR(-ENOMEM);
if (is_bad_inode(inode)
|| (generation && inode->i_generation != generation)
) {
/* we didn't find the right inode.. */
dprintk("fh_verify: Inode %lu, Bad count: %d %d or version %u %u\n",
inode->i_ino,
inode->i_nlink, atomic_read(&inode->i_count),
inode->i_generation,
generation);
iput(inode);
return ERR_PTR(-ESTALE);
}
/* now to find a dentry.
* If possible, get a well-connected one
*/
result = d_alloc_anon(inode);
if (!result) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
STATIC struct dentry *
xfs_fs_get_parent(
struct dentry *child)
{
int error;
bhv_vnode_t *cvp;
struct dentry *parent;
cvp = NULL;
error = xfs_lookup(XFS_I(child->d_inode), &dotdot, &cvp);
if (unlikely(error))
return ERR_PTR(-error);
parent = d_alloc_anon(vn_to_inode(cvp));
if (unlikely(!parent)) {
VN_RELE(cvp);
return ERR_PTR(-ENOMEM);
}
return parent;
}
static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
{
__u32 *objp = vobjp;
unsigned long ino = objp[0];
__u32 generation = objp[1];
struct inode *inode;
struct dentry *result;
if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
return ERR_PTR(-ESTALE);
if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
return ERR_PTR(-ESTALE);
/* iget isn't really right if the inode is currently unallocated!!
* ext2_read_inode currently does appropriate checks, but
* it might be "neater" to call ext2_get_inode first and check
* if the inode is valid.....
*/
inode = iget(sb, ino);
if (inode == NULL)
return ERR_PTR(-ENOMEM);
if (is_bad_inode(inode) ||
(generation && inode->i_generation != generation)) {
/* we didn't find the right inode.. */
iput(inode);
return ERR_PTR(-ESTALE);
}
/* now to find a dentry.
* If possible, get a well-connected one
*/
result = d_alloc_anon(inode);
if (!result) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return result;
}
struct dentry *ext2_get_parent(struct dentry *child)
{
unsigned long ino;
struct dentry *parent;
struct inode *inode;
struct dentry dotdot;
dotdot.d_name.name = "..";
dotdot.d_name.len = 2;
ino = ext2_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
inode = iget(child->d_inode->i_sb, ino);
if (!inode)
return ERR_PTR(-EACCES);
parent = d_alloc_anon(inode);
if (!parent) {
iput(inode);
parent = ERR_PTR(-ENOMEM);
}
return parent;
}
STATIC int
xfs_open_by_handle(
xfs_mount_t *mp,
unsigned long arg,
struct file *parfilp,
struct inode *parinode)
{
int error;
int new_fd;
int permflag;
struct file *filp;
struct inode *inode;
struct dentry *dentry;
vnode_t *vp;
xfs_fsop_handlereq_t hreq;
error = xfs_vget_fsop_handlereq(mp, parinode, CAP_SYS_ADMIN, arg,
sizeof(xfs_fsop_handlereq_t),
&hreq, &vp, &inode);
if (error)
return -error;
/* Restrict xfs_open_by_handle to directories & regular files. */
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
iput(inode);
return -XFS_ERROR(EINVAL);
}
#if BITS_PER_LONG != 32
hreq.oflags |= O_LARGEFILE;
#endif
/* Put open permission in namei format. */
permflag = hreq.oflags;
if ((permflag+1) & O_ACCMODE)
permflag++;
if (permflag & O_TRUNC)
permflag |= 2;
if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
(permflag & FMODE_WRITE) && IS_APPEND(inode)) {
iput(inode);
return -XFS_ERROR(EPERM);
}
if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
iput(inode);
return -XFS_ERROR(EACCES);
}
/* Can't write directories. */
if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
iput(inode);
return -XFS_ERROR(EISDIR);
}
if ((new_fd = get_unused_fd()) < 0) {
iput(inode);
return new_fd;
}
dentry = d_alloc_anon(inode);
if (dentry == NULL) {
iput(inode);
put_unused_fd(new_fd);
return -XFS_ERROR(ENOMEM);
}
/* Ensure umount returns EBUSY on umounts while this file is open. */
mntget(parfilp->f_vfsmnt);
/* Create file pointer. */
filp = dentry_open(dentry, parfilp->f_vfsmnt, hreq.oflags);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
}
if (inode->i_mode & S_IFREG)
filp->f_op = &linvfs_invis_file_operations;
fd_install(new_fd, filp);
return new_fd;
}
/*
* get an NFS2/NFS3 root dentry from the root filehandle
*/
struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fsinfo fsinfo;
struct nfs_fattr fattr;
struct dentry *mntroot;
struct inode *inode;
int error;
/* create a dummy root dentry with dummy inode for this superblock */
if (!sb->s_root) {
struct nfs_fh dummyfh;
struct dentry *root;
struct inode *iroot;
memset(&dummyfh, 0, sizeof(dummyfh));
memset(&fattr, 0, sizeof(fattr));
nfs_fattr_init(&fattr);
fattr.valid = NFS_ATTR_FATTR;
fattr.type = NFDIR;
fattr.mode = S_IFDIR | S_IRUSR | S_IWUSR;
fattr.nlink = 2;
iroot = nfs_fhget(sb, &dummyfh, &fattr);
if (IS_ERR(iroot))
return ERR_PTR(PTR_ERR(iroot));
root = d_alloc_root(iroot);
if (!root) {
iput(iroot);
return ERR_PTR(-ENOMEM);
}
sb->s_root = root;
}
/* get the actual root for this mount */
fsinfo.fattr = &fattr;
error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
}
inode = nfs_fhget(sb, mntfh, fsinfo.fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
return ERR_PTR(PTR_ERR(inode));
}
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
mntroot = d_alloc_anon(inode);
if (!mntroot) {
iput(inode);
dprintk("nfs_get_root: get root dentry failed\n");
return ERR_PTR(-ENOMEM);
}
security_d_instantiate(mntroot, inode);
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
return mntroot;
}
static int
#ifdef HAVE_ENCODE_FH_WITH_INODE
zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent)
{
#else
zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable)
{
struct inode *ip = dentry->d_inode;
#endif /* HAVE_ENCODE_FH_WITH_INODE */
fid_t *fid = (fid_t *)fh;
int len_bytes, rc;
len_bytes = *max_len * sizeof (__u32);
if (len_bytes < offsetof(fid_t, fid_data))
return (255);
fid->fid_len = len_bytes - offsetof(fid_t, fid_data);
if (zfsctl_is_node(ip))
rc = zfsctl_fid(ip, fid);
else
rc = zfs_fid(ip, fid);
len_bytes = offsetof(fid_t, fid_data) + fid->fid_len;
*max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32);
return (rc == 0 ? FILEID_INO32_GEN : 255);
}
static struct dentry *
zpl_dentry_obtain_alias(struct inode *ip)
{
struct dentry *result;
#ifdef HAVE_D_OBTAIN_ALIAS
result = d_obtain_alias(ip);
#else
result = d_alloc_anon(ip);
if (result == NULL) {
VN_RELE(ip);
result = ERR_PTR(-ENOMEM);
}
#endif /* HAVE_D_OBTAIN_ALIAS */
return (result);
}
static struct dentry *
zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
fid_t *fid = (fid_t *)fh;
struct inode *ip;
int len_bytes, rc;
len_bytes = fh_len * sizeof (__u32);
if (fh_type != FILEID_INO32_GEN ||
len_bytes < offsetof(fid_t, fid_data) ||
len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
return (ERR_PTR(-EINVAL));
rc = zfs_vget(sb, &ip, fid);
if (rc != 0)
return (ERR_PTR(-rc));
ASSERT((ip != NULL) && !IS_ERR(ip));
return (zpl_dentry_obtain_alias(ip));
}
static struct dentry *gfs2_get_dentry(struct super_block *sb,
struct gfs2_inum_host *inum)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj;
struct gfs2_holder i_gh, ri_gh, rgd_gh;
struct gfs2_rgrpd *rgd;
struct inode *inode;
struct dentry *dentry;
int error;
/* System files? */
inode = gfs2_ilookup(sb, inum);
if (inode) {
if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) {
iput(inode);
return ERR_PTR(-ESTALE);
}
goto out_inode;
}
error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)
return ERR_PTR(error);
error = gfs2_rindex_hold(sdp, &ri_gh);
if (error)
goto fail;
error = -EINVAL;
rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
if (!rgd)
goto fail_rindex;
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
if (error)
goto fail_rindex;
error = -ESTALE;
if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
goto fail_rgd;
gfs2_glock_dq_uninit(&rgd_gh);
gfs2_glock_dq_uninit(&ri_gh);
inode = gfs2_inode_lookup(sb, inum, fh_obj->imode);
if (!inode)
goto fail;
if (IS_ERR(inode)) {
error = PTR_ERR(inode);
goto fail;
}
error = gfs2_inode_refresh(GFS2_I(inode));
if (error) {
iput(inode);
goto fail;
}
error = -EIO;
if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
iput(inode);
goto fail;
}
gfs2_glock_dq_uninit(&i_gh);
out_inode:
dentry = d_alloc_anon(inode);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
dentry->d_op = &gfs2_dops;
return dentry;
fail_rgd:
gfs2_glock_dq_uninit(&rgd_gh);
fail_rindex:
gfs2_glock_dq_uninit(&ri_gh);
fail:
gfs2_glock_dq_uninit(&i_gh);
return ERR_PTR(error);
}
static int
#ifdef HAVE_ENCODE_FH_WITH_INODE
zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent)
{
#else
zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable)
{
struct inode *ip = dentry->d_inode;
#endif /* HAVE_ENCODE_FH_WITH_INODE */
fstrans_cookie_t cookie;
fid_t *fid = (fid_t *)fh;
int len_bytes, rc;
len_bytes = *max_len * sizeof (__u32);
if (len_bytes < offsetof(fid_t, fid_data))
return (255);
fid->fid_len = len_bytes - offsetof(fid_t, fid_data);
cookie = spl_fstrans_mark();
if (zfsctl_is_node(ip))
rc = zfsctl_fid(ip, fid);
else
rc = zfs_fid(ip, fid);
spl_fstrans_unmark(cookie);
len_bytes = offsetof(fid_t, fid_data) + fid->fid_len;
*max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32);
return (rc == 0 ? FILEID_INO32_GEN : 255);
}
static struct dentry *
zpl_dentry_obtain_alias(struct inode *ip)
{
struct dentry *result;
#ifdef HAVE_D_OBTAIN_ALIAS
result = d_obtain_alias(ip);
#else
result = d_alloc_anon(ip);
if (result == NULL) {
VN_RELE(ip);
result = ERR_PTR(-ENOMEM);
}
#endif /* HAVE_D_OBTAIN_ALIAS */
return (result);
}
static struct dentry *
zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
fid_t *fid = (fid_t *)fh;
fstrans_cookie_t cookie;
struct inode *ip;
int len_bytes, rc;
len_bytes = fh_len * sizeof (__u32);
if (fh_type != FILEID_INO32_GEN ||
len_bytes < offsetof(fid_t, fid_data) ||
len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
return (ERR_PTR(-EINVAL));
cookie = spl_fstrans_mark();
rc = zfs_vget(sb, &ip, fid);
spl_fstrans_unmark(cookie);
if (rc) {
/*
* If we see ENOENT it might mean that an NFSv4 * client
* is using a cached inode value in a file handle and
* that the sought after file has had its inode changed
* by a third party. So change the error to ESTALE
* which will trigger a full lookup by the client and
* will find the new filename/inode pair if it still
* exists.
*/
if (rc == ENOENT)
rc = ESTALE;
return (ERR_PTR(-rc));
}
ASSERT((ip != NULL) && !IS_ERR(ip));
return (zpl_dentry_obtain_alias(ip));
}
osi_UFSOpen(afs_int32 ainode)
#endif
{
register struct osi_file *afile = NULL;
extern int cacheDiskType;
struct inode *tip = NULL;
struct dentry *dp = NULL;
struct file *filp = NULL;
#if !defined(HAVE_IGET) || defined(LINUX_USE_FH)
struct fid fid;
#endif
AFS_STATCNT(osi_UFSOpen);
if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
osi_Panic("UFSOpen called for non-UFS cache\n");
}
if (!afs_osicred_initialized) {
/* valid for alpha_osf, SunOS, Ultrix */
memset((char *)&afs_osi_cred, 0, sizeof(struct AFS_UCRED));
crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
afs_osicred_initialized = 1;
}
afile = (struct osi_file *)osi_AllocLargeSpace(sizeof(struct osi_file));
AFS_GUNLOCK();
if (!afile) {
osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
sizeof(struct osi_file));
}
memset(afile, 0, sizeof(struct osi_file));
#if defined(HAVE_IGET)
tip = iget(afs_cacheSBp, (u_long) ainode);
if (!tip)
osi_Panic("Can't get inode %d\n", ainode);
dp = d_alloc_anon(tip);
#else
#if defined(LINUX_USE_FH)
dp = afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, fh, sizeof(struct fid), fh_type);
#else
fid.i32.ino = ainode;
fid.i32.gen = 0;
dp = afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &fid, sizeof(fid), FILEID_INO32_GEN);
#endif
if (!dp)
osi_Panic("Can't get dentry\n");
tip = dp->d_inode;
#endif
tip->i_flags |= MS_NOATIME; /* Disable updating access times. */
#if defined(STRUCT_TASK_HAS_CRED)
filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR, current_cred());
#else
filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR);
#endif
if (IS_ERR(filp))
#if defined(LINUX_USE_FH)
osi_Panic("Can't open file\n");
#else
osi_Panic("Can't open inode %d\n", ainode);
#endif
afile->filp = filp;
afile->size = i_size_read(FILE_INODE(filp));
AFS_GLOCK();
afile->offset = 0;
afile->proc = (int (*)())0;
#if defined(LINUX_USE_FH)
afile->inum = tip->i_ino; /* for hint validity checking */
#else
afile->inum = ainode; /* for hint validity checking */
#endif
return (void *)afile;
}
/* This function is surprisingly simple. The trick is understanding
* that "child" is always a directory. So, to find its parent, you
* simply need to find its ".." entry, normalize its block and offset,
* and return the underlying inode. See the comments for
* isofs_normalize_block_and_offset(). */
static struct dentry *isofs_export_get_parent(struct dentry *child)
{
unsigned long parent_block = 0;
unsigned long parent_offset = 0;
struct inode *child_inode = child->d_inode;
struct iso_inode_info *e_child_inode = ISOFS_I(child_inode);
struct inode *parent_inode = NULL;
struct iso_directory_record *de = NULL;
struct buffer_head * bh = NULL;
struct dentry *rv = NULL;
/* "child" must always be a directory. */
if (!S_ISDIR(child_inode->i_mode)) {
printk(KERN_ERR "isofs: isofs_export_get_parent(): "
"child is not a directory!\n");
rv = ERR_PTR(-EACCES);
goto out;
}
/* It is an invariant that the directory offset is zero. If
* it is not zero, it means the directory failed to be
* normalized for some reason. */
if (e_child_inode->i_iget5_offset != 0) {
printk(KERN_ERR "isofs: isofs_export_get_parent(): "
"child directory not normalized!\n");
rv = ERR_PTR(-EACCES);
goto out;
}
/* The child inode has been normalized such that its
* i_iget5_block value points to the "." entry. Fortunately,
* the ".." entry is located in the same block. */
parent_block = e_child_inode->i_iget5_block;
/* Get the block in question. */
bh = sb_bread(child_inode->i_sb, parent_block);
if (bh == NULL) {
rv = ERR_PTR(-EACCES);
goto out;
}
/* This is the "." entry. */
de = (struct iso_directory_record*)bh->b_data;
/* The ".." entry is always the second entry. */
parent_offset = (unsigned long)isonum_711(de->length);
de = (struct iso_directory_record*)(bh->b_data + parent_offset);
/* Verify it is in fact the ".." entry. */
if ((isonum_711(de->name_len) != 1) || (de->name[0] != 1)) {
printk(KERN_ERR "isofs: Unable to find the \"..\" "
"directory for NFS.\n");
rv = ERR_PTR(-EACCES);
goto out;
}
/* Normalize */
isofs_normalize_block_and_offset(de, &parent_block, &parent_offset);
/* Get the inode. */
parent_inode = isofs_iget(child_inode->i_sb,
parent_block,
parent_offset);
if (IS_ERR(parent_inode)) {
rv = ERR_CAST(parent_inode);
if (rv != ERR_PTR(-ENOMEM))
rv = ERR_PTR(-EACCES);
goto out;
}
/* Allocate the dentry. */
rv = d_alloc_anon(parent_inode);
if (rv == NULL) {
rv = ERR_PTR(-ENOMEM);
goto out;
}
out:
if (bh) {
brelse(bh);
}
return rv;
}
/*
* Given a FID, obtain or construct a dentry, or return an error.
* This should be called with the BKL and AFS_GLOCK held.
*/
static struct dentry *get_dentry_from_fid(cred_t *credp, struct VenusFid *afid)
{
struct vrequest treq;
struct vcache *vcp;
struct vattr vattr;
struct inode *ip;
struct dentry *dp;
afs_int32 code;
code = afs_InitReq(&treq, credp);
if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_dentry_from_fid(0x%08x/%d/%d.%d): afs_InitReq: %d\n",
afid->Cell, afid->Fid.Volume, afid->Fid.Vnode, afid->Fid.Unique,
code);
#endif
return ERR_PTR(-afs_CheckCode(code, &treq, 101));
}
vcp = afs_GetVCache(afid, &treq, NULL, NULL);
if (vcp == NULL) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_dentry_from_fid(0x%08x/%d/%d.%d): no vcache\n",
afid->Cell, afid->Fid.Volume, afid->Fid.Vnode, afid->Fid.Unique);
#endif
return NULL;
}
/*
* Now, it might be that we just caused a directory vnode to
* spring into existence, in which case its parent FID is unset.
* We need to do something about that, but only because we care
* in our own get_parent(), below -- the common code never looks
* at parentVnode on directories, except for VIOCGETVCXSTATUS.
* So, if this fails, we don't really care very much.
*/
if (vType(vcp) == VDIR && vcp->mvstat != 2 && !vcp->f.parent.vnode)
update_dir_parent(&treq, vcp);
/*
* If this is a volume root directory and fakestat is enabled,
* we might need to replace the directory by a mount point.
*/
code = UnEvalFakeStat(&treq, &vcp);
if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_dentry_from_fid(0x%08x/%d/%d.%d): UnEvalFakeStat: %d\n",
afid->Cell, afid->Fid.Volume, afid->Fid.Vnode, afid->Fid.Unique,
code);
#endif
afs_PutVCache(vcp);
return ERR_PTR(-afs_CheckCode(code, &treq, 101));
}
ip = AFSTOV(vcp);
afs_getattr(vcp, &vattr, credp);
afs_fill_inode(ip, &vattr);
/* d_alloc_anon might block, so we shouldn't hold the glock */
AFS_GUNLOCK();
dp = d_alloc_anon(ip);
AFS_GLOCK();
if (!dp) {
iput(ip);
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_dentry_from_fid(0x%08x/%d/%d.%d): out of memory\n",
afid->Cell, afid->Fid.Volume, afid->Fid.Vnode, afid->Fid.Unique);
#endif
return ERR_PTR(-ENOMEM);
}
dp->d_op = &afs_dentry_operations;
return dp;
}
/**
* ntfs_get_parent - find the dentry of the parent of a given directory dentry
* @child_dent: dentry of the directory whose parent directory to find
*
* Find the dentry for the parent directory of the directory specified by the
* dentry @child_dent. This function is called from
* fs/exportfs/expfs.c::find_exported_dentry() which in turn is called from the
* default ->decode_fh() which is export_decode_fh() in the same file.
*
* The code is based on the ext3 ->get_parent() implementation found in
* fs/ext3/namei.c::ext3_get_parent().
*
* Note: ntfs_get_parent() is called with @child_dent->d_inode->i_mutex down.
*
* Return the dentry of the parent directory on success or the error code on
* error (IS_ERR() is true).
*/
static struct dentry *ntfs_get_parent(struct dentry *child_dent)
{
struct inode *vi = child_dent->d_inode;
ntfs_inode *ni = NTFS_I(vi);
MFT_RECORD *mrec;
ntfs_attr_search_ctx *ctx;
ATTR_RECORD *attr;
FILE_NAME_ATTR *fn;
struct inode *parent_vi;
struct dentry *parent_dent;
unsigned long parent_ino;
int err;
ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
/* Get the mft record of the inode belonging to the child dentry. */
mrec = map_mft_record(ni);
if (IS_ERR(mrec))
return (struct dentry *)mrec;
/* Find the first file name attribute in the mft record. */
ctx = ntfs_attr_get_search_ctx(ni, mrec);
if (unlikely(!ctx)) {
unmap_mft_record(ni);
return ERR_PTR(-ENOMEM);
}
try_next:
err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, CASE_SENSITIVE, 0, NULL,
0, ctx);
if (unlikely(err)) {
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(ni);
if (err == -ENOENT)
ntfs_error(vi->i_sb, "Inode 0x%lx does not have a "
"file name attribute. Run chkdsk.",
vi->i_ino);
return ERR_PTR(err);
}
attr = ctx->attr;
if (unlikely(attr->non_resident))
goto try_next;
fn = (FILE_NAME_ATTR *)((u8 *)attr +
le16_to_cpu(attr->data.resident.value_offset));
if (unlikely((u8 *)fn + le32_to_cpu(attr->data.resident.value_length) >
(u8*)attr + le32_to_cpu(attr->length)))
goto try_next;
/* Get the inode number of the parent directory. */
parent_ino = MREF_LE(fn->parent_directory);
/* Release the search context and the mft record of the child. */
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(ni);
/* Get the inode of the parent directory. */
parent_vi = ntfs_iget(vi->i_sb, parent_ino);
if (IS_ERR(parent_vi) || unlikely(is_bad_inode(parent_vi))) {
if (!IS_ERR(parent_vi))
iput(parent_vi);
ntfs_error(vi->i_sb, "Failed to get parent directory inode "
"0x%lx of child inode 0x%lx.", parent_ino,
vi->i_ino);
return ERR_PTR(-EACCES);
}
/* Finally get a dentry for the parent directory and return it. */
parent_dent = d_alloc_anon(parent_vi);
if (unlikely(!parent_dent)) {
iput(parent_vi);
return ERR_PTR(-ENOMEM);
}
ntfs_debug("Done for inode 0x%lx.", vi->i_ino);
return parent_dent;
}
