kernel_optimize_test/fs/orangefs/super.c
Mike Marshall adcf34a289 Orangefs: code sanitation
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
2016-02-24 16:54:27 -05:00

545 lines
14 KiB
C

/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
#include "protocol.h"
#include "orangefs-kernel.h"
#include "orangefs-bufmap.h"
#include <linux/parser.h>
/* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
static struct kmem_cache *orangefs_inode_cache;
/* list for storing orangefs specific superblocks in use */
LIST_HEAD(orangefs_superblocks);
DEFINE_SPINLOCK(orangefs_superblocks_lock);
enum {
Opt_intr,
Opt_acl,
Opt_local_lock,
Opt_err
};
static const match_table_t tokens = {
{ Opt_acl, "acl" },
{ Opt_intr, "intr" },
{ Opt_local_lock, "local_lock" },
{ Opt_err, NULL }
};
static int parse_mount_options(struct super_block *sb, char *options,
int silent)
{
struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
substring_t args[MAX_OPT_ARGS];
char *p;
/*
* Force any potential flags that might be set from the mount
* to zero, ie, initialize to unset.
*/
sb->s_flags &= ~MS_POSIXACL;
orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_acl:
sb->s_flags |= MS_POSIXACL;
break;
case Opt_intr:
orangefs_sb->flags |= ORANGEFS_OPT_INTR;
break;
case Opt_local_lock:
orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
break;
default:
goto fail;
}
}
return 0;
fail:
if (!silent)
gossip_err("Error: mount option [%s] is not supported.\n", p);
return -EINVAL;
}
static void orangefs_inode_cache_ctor(void *req)
{
struct orangefs_inode_s *orangefs_inode = req;
inode_init_once(&orangefs_inode->vfs_inode);
init_rwsem(&orangefs_inode->xattr_sem);
orangefs_inode->vfs_inode.i_version = 1;
}
static struct inode *orangefs_alloc_inode(struct super_block *sb)
{
struct orangefs_inode_s *orangefs_inode;
orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
if (orangefs_inode == NULL) {
gossip_err("Failed to allocate orangefs_inode\n");
return NULL;
}
/*
* We want to clear everything except for rw_semaphore and the
* vfs_inode.
*/
memset(&orangefs_inode->refn.khandle, 0, 16);
orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
orangefs_inode->last_failed_block_index_read = 0;
memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
orangefs_inode->pinode_flags = 0;
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_alloc_inode: allocated %p\n",
&orangefs_inode->vfs_inode);
return &orangefs_inode->vfs_inode;
}
static void orangefs_destroy_inode(struct inode *inode)
{
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"%s: deallocated %p destroying inode %pU\n",
__func__, orangefs_inode, get_khandle_from_ino(inode));
kmem_cache_free(orangefs_inode_cache, orangefs_inode);
}
/*
* NOTE: information filled in here is typically reflected in the
* output of the system command 'df'
*/
static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int ret = -ENOMEM;
struct orangefs_kernel_op_s *new_op = NULL;
int flags = 0;
struct super_block *sb = NULL;
sb = dentry->d_sb;
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_statfs: called on sb %p (fs_id is %d)\n",
sb,
(int)(ORANGEFS_SB(sb)->fs_id));
new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
if (!new_op)
return ret;
new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
flags = ORANGEFS_OP_INTERRUPTIBLE;
ret = service_operation(new_op, "orangefs_statfs", flags);
if (new_op->downcall.status < 0)
goto out_op_release;
gossip_debug(GOSSIP_SUPER_DEBUG,
"%s: got %ld blocks available | "
"%ld blocks total | %ld block size | "
"%ld files total | %ld files avail\n",
__func__,
(long)new_op->downcall.resp.statfs.blocks_avail,
(long)new_op->downcall.resp.statfs.blocks_total,
(long)new_op->downcall.resp.statfs.block_size,
(long)new_op->downcall.resp.statfs.files_total,
(long)new_op->downcall.resp.statfs.files_avail);
buf->f_type = sb->s_magic;
memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
buf->f_bsize = new_op->downcall.resp.statfs.block_size;
buf->f_namelen = ORANGEFS_NAME_LEN;
buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
buf->f_frsize = sb->s_blocksize;
out_op_release:
op_release(new_op);
gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
return ret;
}
/*
* Remount as initiated by VFS layer. We just need to reparse the mount
* options, no need to signal pvfs2-client-core about it.
*/
static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
return parse_mount_options(sb, data, 1);
}
/*
* Remount as initiated by pvfs2-client-core on restart. This is used to
* repopulate mount information left from previous pvfs2-client-core.
*
* the idea here is that given a valid superblock, we're
* re-initializing the user space client with the initial mount
* information specified when the super block was first initialized.
* this is very different than the first initialization/creation of a
* superblock. we use the special service_priority_operation to make
* sure that the mount gets ahead of any other pending operation that
* is waiting for servicing. this means that the pvfs2-client won't
* fail to start several times for all other pending operations before
* the client regains all of the mount information from us.
* NOTE: this function assumes that the request_mutex is already acquired!
*/
int orangefs_remount(struct super_block *sb)
{
struct orangefs_kernel_op_s *new_op;
int ret = -EINVAL;
gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
if (!new_op)
return -ENOMEM;
strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
ORANGEFS_SB(sb)->devname,
ORANGEFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting ORANGEFS Remount via host %s\n",
new_op->upcall.req.fs_mount.orangefs_config_server);
/*
* we assume that the calling function has already acquired the
* request_mutex to prevent other operations from bypassing
* this one
*/
ret = service_operation(new_op, "orangefs_remount",
ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_remount: mount got return value of %d\n",
ret);
if (ret == 0) {
/*
* store the id assigned to this sb -- it's just a
* short-lived mapping that the system interface uses
* to map this superblock to a particular mount entry
*/
ORANGEFS_SB(sb)->id = new_op->downcall.resp.fs_mount.id;
ORANGEFS_SB(sb)->mount_pending = 0;
}
op_release(new_op);
return ret;
}
int fsid_key_table_initialize(void)
{
return 0;
}
void fsid_key_table_finalize(void)
{
}
/* Called whenever the VFS dirties the inode in response to atime updates */
static void orangefs_dirty_inode(struct inode *inode, int flags)
{
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_dirty_inode: %pU\n",
get_khandle_from_ino(inode));
SetAtimeFlag(orangefs_inode);
}
static const struct super_operations orangefs_s_ops = {
.alloc_inode = orangefs_alloc_inode,
.destroy_inode = orangefs_destroy_inode,
.dirty_inode = orangefs_dirty_inode,
.drop_inode = generic_delete_inode,
.statfs = orangefs_statfs,
.remount_fs = orangefs_remount_fs,
.show_options = generic_show_options,
};
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));
}
static int orangefs_encode_fh(struct inode *inode,
__u32 *fh,
int *max_len,
struct inode *parent)
{
int len = parent ? 10 : 5;
int type = 1;
struct orangefs_object_kref refn;
if (*max_len < len) {
gossip_lerr("fh buffer is too small for encoding\n");
*max_len = len;
type = 255;
goto out;
}
refn = ORANGEFS_I(inode)->refn;
ORANGEFS_khandle_to(&refn.khandle, fh, 16);
fh[4] = refn.fs_id;
gossip_debug(GOSSIP_SUPER_DEBUG,
"Encoding fh: handle %pU, fsid %u\n",
&refn.khandle,
refn.fs_id);
if (parent) {
refn = ORANGEFS_I(parent)->refn;
ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
fh[9] = refn.fs_id;
type = 2;
gossip_debug(GOSSIP_SUPER_DEBUG,
"Encoding parent: handle %pU, fsid %u\n",
&refn.khandle,
refn.fs_id);
}
*max_len = len;
out:
return type;
}
static const struct export_operations orangefs_export_ops = {
.encode_fh = orangefs_encode_fh,
.fh_to_dentry = orangefs_fh_to_dentry,
};
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), ORANGEFS_GFP_FLAGS);
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;
}
struct dentry *orangefs_mount(struct file_system_type *fst,
int flags,
const char *devname,
void *data)
{
int ret = -EINVAL;
struct super_block *sb = ERR_PTR(-EINVAL);
struct orangefs_kernel_op_s *new_op;
struct dentry *d = ERR_PTR(-EINVAL);
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_mount: called with devname %s\n",
devname);
if (!devname) {
gossip_err("ERROR: device name not specified.\n");
return ERR_PTR(-EINVAL);
}
new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
if (!new_op)
return ERR_PTR(-ENOMEM);
strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
devname,
ORANGEFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting ORANGEFS Mount via host %s\n",
new_op->upcall.req.fs_mount.orangefs_config_server);
ret = service_operation(new_op, "orangefs_mount", 0);
gossip_debug(GOSSIP_SUPER_DEBUG,
"orangefs_mount: mount got return value of %d\n", ret);
if (ret)
goto free_op;
if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
gossip_err("ERROR: Retrieved null fs_id\n");
ret = -EINVAL;
goto free_op;
}
sb = sget(fst, NULL, set_anon_super, flags, NULL);
if (IS_ERR(sb)) {
d = ERR_CAST(sb);
goto free_op;
}
ret = orangefs_fill_sb(sb,
&new_op->downcall.resp.fs_mount, data,
flags & MS_SILENT ? 1 : 0);
if (ret) {
d = ERR_PTR(ret);
goto free_op;
}
/*
* on successful mount, store the devname and data
* used
*/
strncpy(ORANGEFS_SB(sb)->devname,
devname,
ORANGEFS_MAX_SERVER_ADDR_LEN);
/* mount_pending must be cleared */
ORANGEFS_SB(sb)->mount_pending = 0;
/*
* finally, add this sb to our list of known orangefs
* sb's
*/
add_orangefs_sb(sb);
op_release(new_op);
return dget(sb->s_root);
free_op:
gossip_err("orangefs_mount: mount request failed with %d\n", ret);
if (ret == -EINVAL) {
gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
}
op_release(new_op);
return d;
}
void orangefs_kill_sb(struct super_block *sb)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
/*
* issue the unmount to userspace to tell it to remove the
* dynamic mount info it has for this superblock
*/
orangefs_unmount_sb(sb);
/* remove the sb from our list of orangefs specific sb's */
remove_orangefs_sb(sb);
/* provided sb cleanup */
kill_anon_super(sb);
/* free the orangefs superblock private data */
kfree(ORANGEFS_SB(sb));
}
int orangefs_inode_cache_initialize(void)
{
orangefs_inode_cache = kmem_cache_create("orangefs_inode_cache",
sizeof(struct orangefs_inode_s),
0,
ORANGEFS_CACHE_CREATE_FLAGS,
orangefs_inode_cache_ctor);
if (!orangefs_inode_cache) {
gossip_err("Cannot create orangefs_inode_cache\n");
return -ENOMEM;
}
return 0;
}
int orangefs_inode_cache_finalize(void)
{
kmem_cache_destroy(orangefs_inode_cache);
return 0;
}