static int orangefs_fill_sb(struct super_block *sb,
struct orangefs_fs_mount_response *fs_mount,
void *data, int silent)
{
int ret = -EINVAL;
struct inode *root = NULL;
struct dentry *root_dentry = NULL;
struct orangefs_object_kref root_object;
/* alloc and init our private orangefs sb info */
sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
if (!ORANGEFS_SB(sb))
return -ENOMEM;
ORANGEFS_SB(sb)->sb = sb;
ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
ORANGEFS_SB(sb)->id = fs_mount->id;
if (data) {
ret = parse_mount_options(sb, data, silent);
if (ret)
return ret;
}
/* Hang the xattr handlers off the superblock */
sb->s_xattr = orangefs_xattr_handlers;
sb->s_magic = ORANGEFS_SUPER_MAGIC;
sb->s_op = &orangefs_s_ops;
sb->s_d_op = &orangefs_dentry_operations;
sb->s_blocksize = orangefs_bufmap_size_query();
sb->s_blocksize_bits = orangefs_bufmap_shift_query();
sb->s_maxbytes = MAX_LFS_FILESIZE;
root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
gossip_debug(GOSSIP_SUPER_DEBUG,
"get inode %pU, fsid %d\n",
&root_object.khandle,
root_object.fs_id);
root = orangefs_iget(sb, &root_object);
if (IS_ERR(root))
return PTR_ERR(root);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Allocated root inode [%p] with mode %x\n",
root,
root->i_mode);
/* allocates and places root dentry in dcache */
root_dentry = d_make_root(root);
if (!root_dentry)
return -ENOMEM;
sb->s_export_op = &orangefs_export_ops;
sb->s_root = root_dentry;
return 0;
}
static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
struct fid *fid,
int fh_len,
int fh_type)
{
struct orangefs_object_kref refn;
if (fh_len < 5 || fh_type > 2)
return NULL;
ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
refn.fs_id = (u32) fid->raw[4];
gossip_debug(GOSSIP_SUPER_DEBUG,
"fh_to_dentry: handle %pU, fs_id %d\n",
&refn.khandle,
refn.fs_id);
return d_obtain_alias(orangefs_iget(sb, &refn));
}
/*
* Attempt to resolve an object name (dentry->d_name), parent handle, and
* fsid into a handle for the object.
*/
static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct orangefs_inode_s *parent = ORANGEFS_I(dir);
struct orangefs_kernel_op_s *new_op;
struct inode *inode;
struct dentry *res;
int ret = -EINVAL;
/*
* in theory we could skip a lookup here (if the intent is to
* create) in order to avoid a potentially failed lookup, but
* leaving it in can skip a valid lookup and try to create a file
* that already exists (e.g. the vfs already handles checking for
* -EEXIST on O_EXCL opens, which is broken if we skip this lookup
* in the create path)
*/
gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %s\n",
__func__, dentry->d_name.name);
if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
return ERR_PTR(-ENAMETOOLONG);
new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
if (!new_op)
return ERR_PTR(-ENOMEM);
new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
__FILE__,
__func__,
__LINE__,
&parent->refn.khandle);
new_op->upcall.req.lookup.parent_refn = parent->refn;
strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
ORANGEFS_NAME_MAX);
gossip_debug(GOSSIP_NAME_DEBUG,
"%s: doing lookup on %s under %pU,%d\n",
__func__,
new_op->upcall.req.lookup.d_name,
&new_op->upcall.req.lookup.parent_refn.khandle,
new_op->upcall.req.lookup.parent_refn.fs_id);
ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
gossip_debug(GOSSIP_NAME_DEBUG,
"Lookup Got %pU, fsid %d (ret=%d)\n",
&new_op->downcall.resp.lookup.refn.khandle,
new_op->downcall.resp.lookup.refn.fs_id,
ret);
if (ret < 0) {
if (ret == -ENOENT) {
/*
* if no inode was found, add a negative dentry to
* dcache anyway; if we don't, we don't hold expected
* lookup semantics and we most noticeably break
* during directory renames.
*
* however, if the operation failed or exited, do not
* add the dentry (e.g. in the case that a touch is
* issued on a file that already exists that was
* interrupted during this lookup -- no need to add
* another negative dentry for an existing file)
*/
gossip_debug(GOSSIP_NAME_DEBUG,
"orangefs_lookup: Adding *negative* dentry "
"%p for %s\n",
dentry,
dentry->d_name.name);
d_add(dentry, NULL);
res = NULL;
goto out;
}
/* must be a non-recoverable error */
res = ERR_PTR(ret);
goto out;
}
dentry->d_time = jiffies + dcache_timeout_msecs*HZ/1000;
inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
if (IS_ERR(inode)) {
gossip_debug(GOSSIP_NAME_DEBUG,
"error %ld from iget\n", PTR_ERR(inode));
res = ERR_CAST(inode);
goto out;
}
ORANGEFS_I(inode)->getattr_time = jiffies - 1;
gossip_debug(GOSSIP_NAME_DEBUG,
"%s:%s:%d "
"Found good inode [%lu] with count [%d]\n",
__FILE__,
__func__,
__LINE__,
inode->i_ino,
(int)atomic_read(&inode->i_count));
/* update dentry/inode pair into dcache */
res = d_splice_alias(inode, dentry);
gossip_debug(GOSSIP_NAME_DEBUG,
"Lookup success (inode ct = %d)\n",
(int)atomic_read(&inode->i_count));
out:
op_release(new_op);
return res;
}
