linux-stable/fs/orangefs/super.c
Mike Marshall 1be21f865a Orangefs: don't use mount_nodev, use sget directly.
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
2015-10-03 11:44:37 -04:00

553 lines
14 KiB
C

/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"
#include <linux/parser.h>
/* a cache for pvfs2-inode objects (i.e. pvfs2 inode private data) */
static struct kmem_cache *pvfs2_inode_cache;
/* list for storing pvfs2 specific superblocks in use */
LIST_HEAD(pvfs2_superblocks);
DEFINE_SPINLOCK(pvfs2_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 pvfs2_sb_info_s *pvfs2_sb = PVFS2_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;
pvfs2_sb->flags &= ~PVFS2_OPT_INTR;
pvfs2_sb->flags &= ~PVFS2_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:
pvfs2_sb->flags |= PVFS2_OPT_INTR;
break;
case Opt_local_lock:
pvfs2_sb->flags |= PVFS2_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 pvfs2_inode_cache_ctor(void *req)
{
struct pvfs2_inode_s *pvfs2_inode = req;
inode_init_once(&pvfs2_inode->vfs_inode);
init_rwsem(&pvfs2_inode->xattr_sem);
pvfs2_inode->vfs_inode.i_version = 1;
}
static struct inode *pvfs2_alloc_inode(struct super_block *sb)
{
struct pvfs2_inode_s *pvfs2_inode;
pvfs2_inode = kmem_cache_alloc(pvfs2_inode_cache,
PVFS2_CACHE_ALLOC_FLAGS);
if (pvfs2_inode == NULL) {
gossip_err("Failed to allocate pvfs2_inode\n");
return NULL;
}
/*
* We want to clear everything except for rw_semaphore and the
* vfs_inode.
*/
memset(&pvfs2_inode->refn.khandle, 0, 16);
pvfs2_inode->refn.fs_id = PVFS_FS_ID_NULL;
pvfs2_inode->last_failed_block_index_read = 0;
memset(pvfs2_inode->link_target, 0, sizeof(pvfs2_inode->link_target));
pvfs2_inode->pinode_flags = 0;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_alloc_inode: allocated %p\n",
&pvfs2_inode->vfs_inode);
return &pvfs2_inode->vfs_inode;
}
static void pvfs2_destroy_inode(struct inode *inode)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"%s: deallocated %p destroying inode %pU\n",
__func__, pvfs2_inode, get_khandle_from_ino(inode));
kmem_cache_free(pvfs2_inode_cache, pvfs2_inode);
}
/*
* NOTE: information filled in here is typically reflected in the
* output of the system command 'df'
*/
static int pvfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int ret = -ENOMEM;
struct pvfs2_kernel_op_s *new_op = NULL;
int flags = 0;
struct super_block *sb = NULL;
sb = dentry->d_sb;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_statfs: called on sb %p (fs_id is %d)\n",
sb,
(int)(PVFS2_SB(sb)->fs_id));
new_op = op_alloc(PVFS2_VFS_OP_STATFS);
if (!new_op)
return ret;
new_op->upcall.req.statfs.fs_id = PVFS2_SB(sb)->fs_id;
if (PVFS2_SB(sb)->flags & PVFS2_OPT_INTR)
flags = PVFS2_OP_INTERRUPTIBLE;
ret = service_operation(new_op, "pvfs2_statfs", flags);
if (new_op->downcall.status < 0)
goto out_op_release;
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_statfs: got %ld blocks available | "
"%ld blocks total | %ld block size\n",
(long)new_op->downcall.resp.statfs.blocks_avail,
(long)new_op->downcall.resp.statfs.blocks_total,
(long)new_op->downcall.resp.statfs.block_size);
buf->f_type = sb->s_magic;
memcpy(&buf->f_fsid, &PVFS2_SB(sb)->fs_id, sizeof(buf->f_fsid));
buf->f_bsize = new_op->downcall.resp.statfs.block_size;
buf->f_namelen = PVFS2_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, "pvfs2_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 pvfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_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 pvfs2_remount(struct super_block *sb)
{
struct pvfs2_kernel_op_s *new_op;
int ret = -EINVAL;
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount: called\n");
new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
if (!new_op)
return -ENOMEM;
strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
PVFS2_SB(sb)->devname,
PVFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting PVFS2 Remount via host %s\n",
new_op->upcall.req.fs_mount.pvfs2_config_server);
/*
* we assume that the calling function has already acquire the
* request_mutex to prevent other operations from bypassing
* this one
*/
ret = service_operation(new_op, "pvfs2_remount",
PVFS2_OP_PRIORITY | PVFS2_OP_NO_SEMAPHORE);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_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
*/
PVFS2_SB(sb)->id = new_op->downcall.resp.fs_mount.id;
PVFS2_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 pvfs2_dirty_inode(struct inode *inode, int flags)
{
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_dirty_inode: %pU\n",
get_khandle_from_ino(inode));
SetAtimeFlag(pvfs2_inode);
}
static const struct super_operations pvfs2_s_ops = {
.alloc_inode = pvfs2_alloc_inode,
.destroy_inode = pvfs2_destroy_inode,
.dirty_inode = pvfs2_dirty_inode,
.drop_inode = generic_delete_inode,
.statfs = pvfs2_statfs,
.remount_fs = pvfs2_remount_fs,
.show_options = generic_show_options,
};
static struct dentry *pvfs2_fh_to_dentry(struct super_block *sb,
struct fid *fid,
int fh_len,
int fh_type)
{
struct pvfs2_object_kref refn;
if (fh_len < 5 || fh_type > 2)
return NULL;
PVFS_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(pvfs2_iget(sb, &refn));
}
static int pvfs2_encode_fh(struct inode *inode,
__u32 *fh,
int *max_len,
struct inode *parent)
{
int len = parent ? 10 : 5;
int type = 1;
struct pvfs2_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 = PVFS2_I(inode)->refn;
PVFS_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 = PVFS2_I(parent)->refn;
PVFS_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 struct export_operations pvfs2_export_ops = {
.encode_fh = pvfs2_encode_fh,
.fh_to_dentry = pvfs2_fh_to_dentry,
};
static int pvfs2_fill_sb(struct super_block *sb, void *data, int silent)
{
int ret = -EINVAL;
struct inode *root = NULL;
struct dentry *root_dentry = NULL;
struct pvfs2_mount_sb_info_s *mount_sb_info =
(struct pvfs2_mount_sb_info_s *) data;
struct pvfs2_object_kref root_object;
/* alloc and init our private pvfs2 sb info */
sb->s_fs_info =
kmalloc(sizeof(struct pvfs2_sb_info_s), PVFS2_GFP_FLAGS);
if (!PVFS2_SB(sb))
return -ENOMEM;
memset(sb->s_fs_info, 0, sizeof(struct pvfs2_sb_info_s));
PVFS2_SB(sb)->sb = sb;
PVFS2_SB(sb)->root_khandle = mount_sb_info->root_khandle;
PVFS2_SB(sb)->fs_id = mount_sb_info->fs_id;
PVFS2_SB(sb)->id = mount_sb_info->id;
if (mount_sb_info->data) {
ret = parse_mount_options(sb, mount_sb_info->data,
silent);
if (ret)
return ret;
}
/* Hang the xattr handlers off the superblock */
sb->s_xattr = pvfs2_xattr_handlers;
sb->s_magic = PVFS2_SUPER_MAGIC;
sb->s_op = &pvfs2_s_ops;
sb->s_d_op = &pvfs2_dentry_operations;
sb->s_blocksize = pvfs_bufmap_size_query();
sb->s_blocksize_bits = pvfs_bufmap_shift_query();
sb->s_maxbytes = MAX_LFS_FILESIZE;
root_object.khandle = PVFS2_SB(sb)->root_khandle;
root_object.fs_id = PVFS2_SB(sb)->fs_id;
gossip_debug(GOSSIP_SUPER_DEBUG,
"get inode %pU, fsid %d\n",
&root_object.khandle,
root_object.fs_id);
root = pvfs2_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) {
iput(root);
return -ENOMEM;
}
sb->s_export_op = &pvfs2_export_ops;
sb->s_root = root_dentry;
return 0;
}
struct dentry *pvfs2_mount(struct file_system_type *fst,
int flags,
const char *devname,
void *data)
{
int ret = -EINVAL;
struct super_block *sb = ERR_PTR(-EINVAL);
struct pvfs2_kernel_op_s *new_op;
struct pvfs2_mount_sb_info_s mount_sb_info;
struct dentry *d = ERR_PTR(-EINVAL);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_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(PVFS2_VFS_OP_FS_MOUNT);
if (!new_op)
return ERR_PTR(-ENOMEM);
strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
devname,
PVFS_MAX_SERVER_ADDR_LEN);
gossip_debug(GOSSIP_SUPER_DEBUG,
"Attempting PVFS2 Mount via host %s\n",
new_op->upcall.req.fs_mount.pvfs2_config_server);
ret = service_operation(new_op, "pvfs2_mount", 0);
gossip_debug(GOSSIP_SUPER_DEBUG,
"pvfs2_mount: mount got return value of %d\n", ret);
if (ret)
goto free_op;
if (new_op->downcall.resp.fs_mount.fs_id == PVFS_FS_ID_NULL) {
gossip_err("ERROR: Retrieved null fs_id\n");
ret = -EINVAL;
goto free_op;
}
/* fill in temporary structure passed to fill_sb method */
mount_sb_info.data = data;
mount_sb_info.root_khandle =
new_op->downcall.resp.fs_mount.root_khandle;
mount_sb_info.fs_id = new_op->downcall.resp.fs_mount.fs_id;
mount_sb_info.id = new_op->downcall.resp.fs_mount.id;
sb = sget(fst, NULL, set_anon_super, flags, NULL);
if (IS_ERR(sb)) {
d = ERR_CAST(sb);
goto free_op;
}
ret = pvfs2_fill_sb(sb,
(void *)&mount_sb_info,
flags & MS_SILENT ? 1 : 0);
if (ret) {
d = ERR_PTR(ret);
goto free_op;
}
/*
* on successful mount, store the devname and data
* used
*/
strncpy(PVFS2_SB(sb)->devname,
devname,
PVFS_MAX_SERVER_ADDR_LEN);
/* mount_pending must be cleared */
PVFS2_SB(sb)->mount_pending = 0;
/*
* finally, add this sb to our list of known pvfs2
* sb's
*/
add_pvfs2_sb(sb);
op_release(new_op);
return dget(sb->s_root);
free_op:
gossip_err("pvfs2_mount: mount request failed with %d\n", ret);
if (ret == -EINVAL) {
gossip_err("Ensure that all pvfs2-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 pvfs2_kill_sb(struct super_block *sb)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_kill_sb: called\n");
/*
* issue the unmount to userspace to tell it to remove the
* dynamic mount info it has for this superblock
*/
pvfs2_unmount_sb(sb);
/* remove the sb from our list of pvfs2 specific sb's */
remove_pvfs2_sb(sb);
/* provided sb cleanup */
kill_anon_super(sb);
/* free the pvfs2 superblock private data */
kfree(PVFS2_SB(sb));
}
int pvfs2_inode_cache_initialize(void)
{
pvfs2_inode_cache = kmem_cache_create("pvfs2_inode_cache",
sizeof(struct pvfs2_inode_s),
0,
PVFS2_CACHE_CREATE_FLAGS,
pvfs2_inode_cache_ctor);
if (!pvfs2_inode_cache) {
gossip_err("Cannot create pvfs2_inode_cache\n");
return -ENOMEM;
}
return 0;
}
int pvfs2_inode_cache_finalize(void)
{
kmem_cache_destroy(pvfs2_inode_cache);
return 0;
}