// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/kthread.h>
#include <linux/export.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/quotaops.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/fs_parser.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "log.h"
#include "quota.h"
#include "dir.h"
#include "meta_io.h"
#include "trace_gfs2.h"
#include "lops.h"
#define DO 0
#define UNDO 1
/**
* gfs2_tune_init - Fill a gfs2_tune structure with default values
* @gt: tune
*
*/
static void gfs2_tune_init(struct gfs2_tune *gt)
{
spin_lock_init(>->gt_spin);
gt->gt_quota_warn_period = 10;
gt->gt_quota_scale_num = 1;
gt->gt_quota_scale_den = 1;
gt->gt_new_files_jdata = 0;
gt->gt_max_readahead = BIT(18);
gt->gt_complain_secs = 10;
}
void free_sbd(struct gfs2_sbd *sdp)
{
if (sdp->sd_lkstats)
free_percpu(sdp->sd_lkstats);
kfree(sdp);
}
static struct gfs2_sbd *init_sbd(struct super_block *sb)
{
struct gfs2_sbd *sdp;
struct address_space *mapping;
sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
if (!sdp)
return NULL;
sdp->sd_vfs = sb;
sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
if (!sdp->sd_lkstats)
goto fail;
sb->s_fs_info = sdp;
set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
gfs2_tune_init(&sdp->sd_tune);
init_waitqueue_head(&sdp->sd_kill_wait);
init_waitqueue_head(&sdp->sd_async_glock_wait);
atomic_set(&sdp->sd_glock_disposal, 0);
init_completion(&sdp->sd_locking_init);
init_completion(&sdp->sd_wdack);
spin_lock_init(&sdp->sd_statfs_spin);
spin_lock_init(&sdp->sd_rindex_spin);
sdp->sd_rindex_tree.rb_node = NULL;
INIT_LIST_HEAD(&sdp->sd_jindex_list);
spin_lock_init(&sdp->sd_jindex_spin);
mutex_init(&sdp->sd_jindex_mutex);
init_completion(&sdp->sd_journal_ready);
INIT_LIST_HEAD(&sdp->sd_quota_list);
mutex_init(&sdp->sd_quota_sync_mutex);
init_waitqueue_head(&sdp->sd_quota_wait);
spin_lock_init(&sdp->sd_bitmap_lock);
INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
mapping = &sdp->sd_aspace;
address_space_init_once(mapping);
mapping->a_ops = &gfs2_rgrp_aops;
mapping->host = sb->s_bdev->bd_mapping->host;
mapping->flags = 0;
mapping_set_gfp_mask(mapping, GFP_NOFS);
mapping->i_private_data = NULL;
mapping->writeback_index = 0;
spin_lock_init(&sdp->sd_log_lock);
atomic_set(&sdp->sd_log_pinned, 0);
INIT_LIST_HEAD(&sdp->sd_log_revokes);
INIT_LIST_HEAD(&sdp->sd_log_ordered);
spin_lock_init(&sdp->sd_ordered_lock);
init_waitqueue_head(&sdp->sd_log_waitq);
init_waitqueue_head(&sdp->sd_logd_waitq);
spin_lock_init(&sdp->sd_ail_lock);
INIT_LIST_HEAD(&sdp->sd_ail1_list);
INIT_LIST_HEAD(&sdp->sd_ail2_list);
init_rwsem(&sdp->sd_log_flush_lock);
atomic_set(&sdp->sd_log_in_flight, 0);
init_waitqueue_head(&sdp->sd_log_flush_wait);
mutex_init(&sdp->sd_freeze_mutex);
INIT_LIST_HEAD(&sdp->sd_dead_glocks);
return sdp;
fail:
free_sbd(sdp);
return NULL;
}
/**
* gfs2_check_sb - Check superblock
* @sdp: the filesystem
* @silent: Don't print a message if the check fails
*
* Checks the version code of the FS is one that we understand how to
* read and that the sizes of the various on-disk structures have not
* changed.
*/
static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
{
struct gfs2_sb_host *sb = &sdp->sd_sb;
if (sb->sb_magic != GFS2_MAGIC ||
sb->sb_type != GFS2_METATYPE_SB) {
if (!silent)
pr_warn("not a GFS2 filesystem\n");
return -EINVAL;
}
if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
return -EINVAL;
}
if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
(sb->sb_bsize & (sb->sb_bsize - 1))) {
pr_warn("Invalid block size\n");
return -EINVAL;
}
if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
pr_warn("Invalid block size shift\n");
return -EINVAL;
}
return 0;
}
static void gfs2_sb_in(struct gfs2_sbd *sdp, const struct gfs2_sb *str)
{
struct gfs2_sb_host *sb = &sdp->sd_sb;
struct super_block *s = sdp->sd_vfs;
sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
sb->sb_bsize = be32_to_cpu(str->sb_bsize);
sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
super_set_uuid(s, str->sb_uuid, 16);
}
/**
* gfs2_read_super - Read the gfs2 super block from disk
* @sdp: The GFS2 super block
* @sector: The location of the super block
* @silent: Don't print a message if the check fails
*
* This uses the bio functions to read the super block from disk
* because we want to be 100% sure that we never read cached data.
* A super block is read twice only during each GFS2 mount and is
* never written to by the filesystem. The first time its read no
* locks are held, and the only details which are looked at are those
* relating to the locking protocol. Once locking is up and working,
* the sb is read again under the lock to establish the location of
* the master directory (contains pointers to journals etc) and the
* root directory.
*
* Returns: 0 on success or error
*/
static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
{
struct super_block *sb = sdp->sd_vfs;
struct page *page;
struct bio_vec bvec;
struct bio bio;
int err;
page = alloc_page(GFP_KERNEL);
if (unlikely(!page))
return -ENOMEM;
bio_init(&bio, sb->s_bdev, &bvec, 1, REQ_OP_READ | REQ_META);
bio.bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
__bio_add_page(&bio, page, PAGE_SIZE, 0);
err = submit_bio_wait(&bio);
if (err) {
pr_warn("error %d reading superblock\n", err);
__free_page(page);
return err;
}
gfs2_sb_in(sdp, page_address(page));
__free_page(page);
return gfs2_check_sb(sdp, silent);
}
/**
* gfs2_read_sb - Read super block
* @sdp: The GFS2 superblock
* @silent: Don't print message if mount fails
*
*/
static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
{
u32 hash_blocks, ind_blocks, leaf_blocks;
u32 tmp_blocks;
unsigned int x;
int error;
error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
if (error) {
if (!silent)
fs_err(sdp, "can't read superblock\n");
return error;
}
sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_dinode)) / sizeof(u64);
sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_meta_header)) / sizeof(u64);
sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_meta_header)) /
sizeof(struct gfs2_quota_change);
sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_meta_header))
* GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
/*
* We always keep at least one block reserved for revokes in
* transactions. This greatly simplifies allocating additional
* revoke blocks.
*/
atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
/* Compute maximum reservation required to add a entry to a directory */
hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
sdp->sd_jbsize);
ind_blocks = 0;
for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
ind_blocks += tmp_blocks;
}
leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_dinode);
sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
for (x = 2;; x++) {
u64 space, d;
u32 m;
space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
d = space;
m = do_div(d, sdp->sd_inptrs);
if (d != sdp->sd_heightsize[x - 1] || m)
break;
sdp->sd_heightsize[x] = space;
}
sdp->sd_max_height = x;
sdp->sd_heightsize[x] = ~0;
gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_leaf)) /
GFS2_MIN_DIRENT_SIZE;
return 0;
}
static int init_names(struct gfs2_sbd *sdp, int silent)
{
char *proto, *table;
int error = 0;
proto = sdp->sd_args.ar_lockproto;
table = sdp->sd_args.ar_locktable;
/* Try to autodetect */
if (!proto[0] || !table[0]) {
error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
if (error)
return error;
if (!proto[0])
proto = sdp->sd_sb.sb_lockproto;
if (!table[0])
table = sdp->sd_sb.sb_locktable;
}
if (!table[0])
table = sdp->sd_vfs->s_id;
BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
table = sdp->sd_table_name;
while ((table = strchr(table, '/')))
*table = '_';
return error;
}
static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
int undo)
{
int error = 0;
if (undo)
goto fail_trans;
error = gfs2_glock_nq_num(sdp,
GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
LM_ST_EXCLUSIVE,
LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
mount_gh);
if (error) {
fs_err(sdp, "can't acquire mount glock: %d\n", error);
goto fail;
}
error = gfs2_glock_nq_num(sdp,
GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
LM_ST_SHARED,
LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
&sdp->sd_live_gh);
if (error) {
fs_err(sdp, "can't acquire live glock: %d\n", error);
goto fail_mount;
}
error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
CREATE, &sdp->sd_rename_gl);
if (error) {
fs_err(sdp, "can't create rename glock: %d\n", error);
goto fail_live;
}
error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
CREATE, &sdp->sd_freeze_gl);
if (error) {
fs_err(sdp, "can't create freeze glock: %d\n", error);
goto fail_rename;
}
return 0;
fail_trans:
gfs2_glock_put(sdp->sd_freeze_gl);
fail_rename:
gfs2_glock_put(sdp->sd_rename_gl);
fail_live:
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
fail_mount:
gfs2_glock_dq_uninit(mount_gh);
fail:
return error;
}
static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
u64 no_addr, const char *name)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct dentry *dentry;
struct inode *inode;
inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
GFS2_BLKST_FREE /* ignore */);
if (IS_ERR(inode)) {
fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
return PTR_ERR(inode);
}
dentry = d_make_root(inode);
if (!dentry) {
fs_err(sdp, "can't alloc %s dentry\n", name);
return -ENOMEM;
}
*dptr = dentry;
return 0;
}
static int init_sb(struct gfs2_sbd *sdp, int silent)
{
struct super_block *sb = sdp->sd_vfs;
struct gfs2_holder sb_gh;
u64 no_addr;
int ret;
ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
LM_ST_SHARED, 0, &sb_gh);
if (ret) {
fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
return ret;
}
ret = gfs2_read_sb(sdp, silent);
if (ret) {
fs_err(sdp, "can't read superblock: %d\n", ret);
goto out;
}
switch(sdp->sd_sb.sb_fs_format) {
case GFS2_FS_FORMAT_MAX:
sb->s_xattr = gfs2_xattr_handlers_max;
break;
case GFS2_FS_FORMAT_MIN:
sb->s_xattr = gfs2_xattr_handlers_min;
break;
default:
BUG();
}
/* Set up the buffer cache and SB for real */
if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
ret = -EINVAL;
fs_err(sdp, "FS block size (%u) is too small for device "
"block size (%u)\n",
sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
goto out;
}
if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
ret = -EINVAL;
fs_err(sdp, "FS block size (%u) is too big for machine "
"page size (%u)\n",
sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
goto out;
}
sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
/* Get the root inode */
no_addr = sdp->sd_sb.sb_root_dir.no_addr;
ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
if (ret)
goto out;
/* Get the master inode */
no_addr = sdp->sd_sb.sb_master_dir.no_addr;
ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
if (ret) {
dput(sdp->sd_root_dir);
goto out;
}
sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
out:
gfs2_glock_dq_uninit(&sb_gh);
return ret;
}
static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
{
char *message = "FIRSTMOUNT=Done";
char *envp[] = { message, NULL };
fs_info(sdp, "first mount done, others may mount\n");
if (sdp->sd_lockstruct.ls_ops->lm_first_done)
sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
}
/**
* gfs2_jindex_hold - Grab a lock on the jindex
* @sdp: The GFS2 superblock
* @ji_gh: the holder for the jindex glock
*
* Returns: errno
*/
static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
{
struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
struct qstr name;
char buf[20];
struct gfs2_jdesc *jd;
int error;
name.name = buf;
mutex_lock(&sdp->sd_jindex_mutex);
for (;;) {
struct gfs2_inode *jip;
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
if (error)
break;
name.len = sprintf(buf, "journal%u", sdp->sd_journals);
name.hash = gfs2_disk_hash(name.name, name.len);
error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
if (error == -ENOENT) {
error = 0;
break;
}
gfs2_glock_dq_uninit(ji_gh);
if (error)
break;
error = -ENOMEM;
jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
if (!jd)
break;
INIT_LIST_HEAD(&jd->extent_list);
INIT_LIST_HEAD(&jd->jd_revoke_list);
INIT_WORK(&jd->jd_work, gfs2_recover_func);
jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
if (IS_ERR_OR_NULL(jd->jd_inode)) {
if (!jd->jd_inode)
error = -ENOENT;
else
error = PTR_ERR(jd->jd_inode);
kfree(jd);
break;
}
d_mark_dontcache(jd->jd_inode);
spin_lock(&sdp->sd_jindex_spin);
jd->jd_jid = sdp->sd_journals++;
jip = GFS2_I(jd->jd_inode);
jd->jd_no_addr = jip->i_no_addr;
list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
spin_unlock(&sdp->sd_jindex_spin);
}
mutex_unlock(&sdp->sd_jindex_mutex);
return error;
}
/**
* init_statfs - look up and initialize master and local (per node) statfs inodes
* @sdp: The GFS2 superblock
*
* This should be called after the jindex is initialized in init_journal() and
* before gfs2_journal_recovery() is called because we need to be able to write
* to these inodes during recovery.
*
* Returns: errno
*/
static int init_statfs(struct gfs2_sbd *sdp)
{
int error = 0;
struct inode *master = d_inode(sdp->sd_master_dir);
struct inode *pn = NULL;
char buf[30];
struct gfs2_jdesc *jd;
struct gfs2_inode *ip;
sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs");
if (IS_ERR(sdp->sd_statfs_inode)) {
error = PTR_ERR(sdp->sd_statfs_inode);
fs_err(sdp, "can't read in statfs inode: %d\n", error);
goto out;
}
if (sdp->sd_args.ar_spectator)
goto out;
pn = gfs2_lookup_meta(master, "per_node");
if (IS_ERR(pn)) {
error = PTR_ERR(pn);
fs_err(sdp, "can't find per_node directory: %d\n", error);
goto put_statfs;
}
/* For each jid, lookup the corresponding local statfs inode in the
* per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
struct local_statfs_inode *lsi =
kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
if (!lsi) {
error = -ENOMEM;
goto free_local;
}
sprintf(buf, "statfs_change%u", jd->jd_jid);
lsi->si_sc_inode = gfs2_lookup_meta(pn, buf);
if (IS_ERR(lsi->si_sc_inode)) {
error = PTR_ERR(lsi->si_sc_inode);
fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
jd->jd_jid, error);
kfree(lsi);
goto free_local;
}
lsi->si_jid = jd->jd_jid;
if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
sdp->sd_sc_inode = lsi->si_sc_inode;
list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
}
iput(pn);
pn = NULL;
ip = GFS2_I(sdp->sd_sc_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
&sdp->sd_sc_gh);
if (error) {
fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
goto free_local;
}
/* read in the local statfs buffer - other nodes don't change it. */
error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
if (error) {
fs_err(sdp, "Cannot read in local statfs: %d\n", error);
goto unlock_sd_gh;
}
return 0;
unlock_sd_gh:
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
free_local:
free_local_statfs_inodes(sdp);
iput(pn);
put_statfs:
iput(sdp->sd_statfs_inode);
out:
return error;
}
/* Uninitialize and free up memory used by the list of statfs inodes */
static void uninit_statfs(struct gfs2_sbd *sdp)
{
if (!sdp->sd_args.ar_spectator) {
brelse(sdp->sd_sc_bh);
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
free_local_statfs_inodes(sdp);
}
iput(sdp->sd_statfs_inode);
}
static int init_journal(struct gfs2_sbd *sdp, int undo)
{
struct inode *master = d_inode(sdp->sd_master_dir);
struct gfs2_holder ji_gh;
struct gfs2_inode *ip;
int error = 0;
gfs2_holder_mark_uninitialized(&ji_gh);
if (undo)
goto fail_statfs;
sdp->sd_jindex = gfs2_lookup_meta(master, "jindex");
if (IS_ERR(sdp->sd_jindex)) {
fs_err(sdp, "can't lookup journal index: %d\n", error);
return PTR_ERR(sdp->sd_jindex);
}
/* Load in the journal index special file */
error = gfs2_jindex_hold(sdp, &ji_gh);
if (error) {
fs_err(sdp, "can't read journal index: %d\n", error);
goto fail;
}
error = -EUSERS;
if (!gfs2_jindex_size(sdp)) {
fs_err(sdp, "no journals!\n");
goto fail_jindex;
}
atomic_set(&sdp->sd_log_blks_needed, 0);
if (sdp->sd_args.ar_spectator) {
sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
} else {
if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
fs_err(sdp, "can't mount journal #%u\n",
sdp->sd_lockstruct.ls_jid);
fs_err(sdp, "there are only %u journals (0 - %u)\n",
gfs2_jindex_size(sdp),
gfs2_jindex_size(sdp) - 1);
goto fail_jindex;
}
sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
&gfs2_journal_glops,
LM_ST_EXCLUSIVE,
LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
&sdp->sd_journal_gh);
if (error) {
fs_err(sdp, "can't acquire journal glock: %d\n", error);
goto fail_jindex;
}
ip = GFS2_I(sdp->sd_jdesc->jd_inode);
sdp->sd_jinode_gl = ip->i_gl;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
LM_FLAG_NOEXP | GL_EXACT |
GL_NOCACHE | GL_NOPID,
&sdp->sd_jinode_gh);
if (error) {
fs_err(sdp, "can't acquire journal inode glock: %d\n",
error);
goto fail_journal_gh;
}
error = gfs2_jdesc_check(sdp->sd_jdesc);
if (error) {
fs_err(sdp, "my journal (%u) is bad: %d\n",
sdp->sd_jdesc->jd_jid, error);
goto fail_jinode_gh;
}
atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
/* Map the extents for this journal's blocks */
gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
}
trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
/* Lookup statfs inodes here so journal recovery can use them. */
error = init_statfs(sdp);
if (error)
goto fail_jinode_gh;
if (sdp->sd_lockstruct.ls_first) {
unsigned int x;
for (x = 0; x < sdp->sd_journals; x++) {
struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
if (sdp->sd_args.ar_spectator) {
error = check_journal_clean(sdp, jd, true);
if (error)
goto fail_statfs;
continue;
}
error = gfs2_recover_journal(jd, true);
if (error) {
fs_err(sdp, "error recovering journal %u: %d\n",
x, error);
goto fail_statfs;
}
}
gfs2_others_may_mount(sdp);
} else if (!sdp->sd_args.ar_spectator) {
error = gfs2_recover_journal(sdp->sd_jdesc, true);
if (error) {
fs_err(sdp, "error recovering my journal: %d\n", error);
goto fail_statfs;
}
}
sdp->sd_log_idle = 1;
set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
gfs2_glock_dq_uninit(&ji_gh);
INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
return 0;
fail_statfs:
uninit_statfs(sdp);
fail_jinode_gh:
/* A withdraw may have done dq/uninit so now we need to check it */
if (!sdp->sd_args.ar_spectator &&
gfs2_holder_initialized(&sdp->sd_jinode_gh))
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
fail_journal_gh:
if (!sdp->sd_args.ar_spectator &&
gfs2_holder_initialized(&sdp->sd_journal_gh))
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
fail_jindex:
gfs2_jindex_free(sdp);
if (gfs2_holder_initialized(&ji_gh))
gfs2_glock_dq_uninit(&ji_gh);
fail:
iput(sdp->sd_jindex);
return error;
}
static struct lock_class_key gfs2_quota_imutex_key;
static int init_inodes(struct gfs2_sbd *sdp, int undo)
{
int error = 0;
struct inode *master = d_inode(sdp->sd_master_dir);
if (undo)
goto fail_qinode;
error = init_journal(sdp, undo);
complete_all(&sdp->sd_journal_ready);
if (error)
goto fail;
/* Read in the resource index inode */
sdp->sd_rindex = gfs2_lookup_meta(master, "rindex");
if (IS_ERR(sdp->sd_rindex)) {
error = PTR_ERR(sdp->sd_rindex);
fs_err(sdp, "can't get resource index inode: %d\n", error);
goto fail_journal;
}
sdp->sd_rindex_uptodate = 0;
/* Read in the quota inode */
sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota");
if (IS_ERR(sdp->sd_quota_inode)) {
error = PTR_ERR(sdp->sd_quota_inode);
fs_err(sdp, "can't get quota file inode: %d\n", error);
goto fail_rindex;
}
/*
* i_rwsem on quota files is special. Since this inode is hidden system
* file, we are safe to define locking ourselves.
*/
lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
&gfs2_quota_imutex_key);
error = gfs2_rindex_update(sdp);
if (error)
goto fail_qinode;
return 0;
fail_qinode:
iput(sdp->sd_quota_inode);
fail_rindex:
gfs2_clear_rgrpd(sdp);
iput(sdp->sd_rindex);
fail_journal:
init_journal(sdp, UNDO);
fail:
return error;
}
static int init_per_node(struct gfs2_sbd *sdp, int undo)
{
struct inode *pn = NULL;
char buf[30];
int error = 0;
struct gfs2_inode *ip;
struct inode *master = d_inode(sdp->sd_master_dir);
if (sdp->sd_args.ar_spectator)
return 0;
if (undo)
goto fail_qc_gh;
pn = gfs2_lookup_meta(master, "per_node");
if (IS_ERR(pn)) {
error = PTR_ERR(pn);
fs_err(sdp, "can't find per_node directory: %d\n", error);
return error;
}
sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf);
if (IS_ERR(sdp->sd_qc_inode)) {
error = PTR_ERR(sdp->sd_qc_inode);
fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
goto fail_ut_i;
}
iput(pn);
pn = NULL;
ip = GFS2_I(sdp->sd_qc_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
&sdp->sd_qc_gh);
if (error) {
fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
goto fail_qc_i;
}
return 0;
fail_qc_gh:
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
fail_qc_i:
iput(sdp->sd_qc_inode);
fail_ut_i:
iput(pn);
return error;
}
static const match_table_t nolock_tokens = {
{ Opt_jid, "jid=%d", },
{ Opt_err, NULL },
};
static const struct lm_lockops nolock_ops = {
.lm_proto_name = "lock_nolock",
.lm_put_lock = gfs2_glock_free,
.lm_tokens = &nolock_tokens,
};
/**
* gfs2_lm_mount - mount a locking protocol
* @sdp: the filesystem
* @silent: if 1, don't complain if the FS isn't a GFS2 fs
*
* Returns: errno
*/
static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
{
const struct lm_lockops *lm;
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
struct gfs2_args *args = &sdp->sd_args;
const char *proto = sdp->sd_proto_name;
const char *table = sdp->sd_table_name;
char *o, *options;
int ret;
if (!strcmp("lock_nolock", proto)) {
lm = &nolock_ops;
sdp->sd_args.ar_localflocks = 1;
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
} else if (!strcmp("lock_dlm", proto)) {
lm = &gfs2_dlm_ops;
#endif
} else {
pr_info("can't find protocol %s\n", proto);
return -ENOENT;
}
fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
ls->ls_ops = lm;
ls->ls_first = 1;
for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
substring_t tmp[MAX_OPT_ARGS];
int token, option;
if (!o || !*o)
continue;
token = match_token(o, *lm->lm_tokens, tmp);
switch (token) {
case Opt_jid:
ret = match_int(&tmp[0], &option);
if (ret || option < 0)
goto hostdata_error;
if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
ls->ls_jid = option;
break;
case Opt_id:
case Opt_nodir:
/* Obsolete, but left for backward compat purposes */
break;
case Opt_first:
ret = match_int(&tmp[0], &option);
if (ret || (option != 0 && option != 1))
goto hostdata_error;
ls->ls_first = option;
break;
case Opt_err:
default:
hostdata_error:
fs_info(sdp, "unknown hostdata (%s)\n", o);
return -EINVAL;
}
}
if (lm->lm_mount == NULL) {
fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
complete_all(&sdp->sd_locking_init);
return 0;
}
ret = lm->lm_mount(sdp, table);
if (ret == 0)
fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
sdp->sd_sb.sb_fs_format);
complete_all(&sdp->sd_locking_init);
return ret;
}
void gfs2_lm_unmount(struct gfs2_sbd *sdp)
{
const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
lm->lm_unmount(sdp);
}
static int wait_on_journal(struct gfs2_sbd *sdp)
{
if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
return 0;
return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
? -EINTR : 0;
}
void gfs2_online_uevent(struct gfs2_sbd *sdp)
{
struct super_block *sb = sdp->sd_vfs;
char ro[20];
char spectator[20];
char *envp[] = { ro, spectator, NULL };
sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
}
static int init_threads(struct gfs2_sbd *sdp)
{
struct task_struct *p;
int error = 0;
p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
if (IS_ERR(p)) {
error = PTR_ERR(p);
fs_err(sdp, "can't create logd thread: %d\n", error);
return error;
}
get_task_struct(p);
sdp->sd_logd_process = p;
p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
if (IS_ERR(p)) {
error = PTR_ERR(p);
fs_err(sdp, "can't create quotad thread: %d\n", error);
goto fail;
}
get_task_struct(p);
sdp->sd_quotad_process = p;
wake_up_process(sdp->sd_logd_process);
wake_up_process(sdp->sd_quotad_process);
return 0;
fail:
kthread_stop_put(sdp->sd_logd_process);
sdp->sd_logd_process = NULL;
return error;
}
void gfs2_destroy_threads(struct gfs2_sbd *sdp)
{
if (sdp->sd_logd_process) {
kthread_stop_put(sdp->sd_logd_process);
sdp->sd_logd_process = NULL;
}
if (sdp->sd_quotad_process) {
kthread_stop_put(sdp->sd_quotad_process);
sdp->sd_quotad_process = NULL;
}
}
/**
* gfs2_fill_super - Read in superblock
* @sb: The VFS superblock
* @fc: Mount options and flags
*
* Returns: -errno
*/
static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct gfs2_args *args = fc->fs_private;
int silent = fc->sb_flags & SB_SILENT;
struct gfs2_sbd *sdp;
struct gfs2_holder mount_gh;
int error;
sdp = init_sbd(sb);
if (!sdp) {
pr_warn("can't alloc struct gfs2_sbd\n");
return -ENOMEM;
}
sdp->sd_args = *args;
if (sdp->sd_args.ar_spectator) {
sb->s_flags |= SB_RDONLY;
set_bit(SDF_RORECOVERY, &sdp->sd_flags);
}
if (sdp->sd_args.ar_posix_acl)
sb->s_flags |= SB_POSIXACL;
if (sdp->sd_args.ar_nobarrier)
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
sb->s_flags |= SB_NOSEC;
sb->s_magic = GFS2_MAGIC;
sb->s_op = &gfs2_super_ops;
sb->s_d_op = &gfs2_dops;
sb->s_export_op = &gfs2_export_ops;
sb->s_qcop = &gfs2_quotactl_ops;
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
sb->s_time_gran = 1;
sb->s_maxbytes = MAX_LFS_FILESIZE;
/* Set up the buffer cache and fill in some fake block size values
to allow us to read-in the on-disk superblock. */
sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, 512);
sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
if (sdp->sd_args.ar_statfs_quantum) {
sdp->sd_tune.gt_statfs_slow = 0;
sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
} else {
sdp->sd_tune.gt_statfs_slow = 1;
sdp->sd_tune.gt_statfs_quantum = 30;
}
error = init_names(sdp, silent);
if (error)
goto fail_free;
snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
error = -ENOMEM;
sdp->sd_glock_wq = alloc_workqueue("gfs2-glock/%s",
WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_FREEZABLE, 0,
sdp->sd_fsname);
if (!sdp->sd_glock_wq)
goto fail_free;
sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname);
if (!sdp->sd_delete_wq)
goto fail_glock_wq;
error = gfs2_sys_fs_add(sdp);
if (error)
goto fail_delete_wq;
gfs2_create_debugfs_file(sdp);
error = gfs2_lm_mount(sdp, silent);
if (error)
goto fail_debug;
error = init_locking(sdp, &mount_gh, DO);
if (error)
goto fail_lm;
error = init_sb(sdp, silent);
if (error)
goto fail_locking;
/* Turn rgrplvb on by default if fs format is recent enough */
if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
sdp->sd_args.ar_rgrplvb = 1;
error = wait_on_journal(sdp);
if (error)
goto fail_sb;
/*
* If user space has failed to join the cluster or some similar
* failure has occurred, then the journal id will contain a
* negative (error) number. This will then be returned to the
* caller (of the mount syscall). We do this even for spectator
* mounts (which just write a jid of 0 to indicate "ok" even though
* the jid is unused in the spectator case)
*/
if (sdp->sd_lockstruct.ls_jid < 0) {
error = sdp->sd_lockstruct.ls_jid;
sdp->sd_lockstruct.ls_jid = 0;
goto fail_sb;
}
if (sdp->sd_args.ar_spectator)
snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
sdp->sd_table_name);
else
snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
error = init_inodes(sdp, DO);
if (error)
goto fail_sb;
error = init_per_node(sdp, DO);
if (error)
goto fail_inodes;
error = gfs2_statfs_init(sdp);
if (error) {
fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
goto fail_per_node;
}
if (!sb_rdonly(sb)) {
error = init_threads(sdp);
if (error)
goto fail_per_node;
}
error = gfs2_freeze_lock_shared(sdp);
if (error)
goto fail_per_node;
if (!sb_rdonly(sb))
error = gfs2_make_fs_rw(sdp);
if (error) {
gfs2_freeze_unlock(sdp);
gfs2_destroy_threads(sdp);
fs_err(sdp, "can't make FS RW: %d\n", error);
goto fail_per_node;
}
gfs2_glock_dq_uninit(&mount_gh);
gfs2_online_uevent(sdp);
return 0;
fail_per_node:
init_per_node(sdp, UNDO);
fail_inodes:
init_inodes(sdp, UNDO);
fail_sb:
if (sdp->sd_root_dir)
dput(sdp->sd_root_dir);
if (sdp->sd_master_dir)
dput(sdp->sd_master_dir);
if (sb->s_root)
dput(sb->s_root);
sb->s_root = NULL;
fail_locking:
init_locking(sdp, &mount_gh, UNDO);
fail_lm:
complete_all(&sdp->sd_journal_ready);
gfs2_gl_hash_clear(sdp);
gfs2_lm_unmount(sdp);
fail_debug:
gfs2_delete_debugfs_file(sdp);
gfs2_sys_fs_del(sdp);
fail_delete_wq:
destroy_workqueue(sdp->sd_delete_wq);
fail_glock_wq:
if (sdp->sd_glock_wq)
destroy_workqueue(sdp->sd_glock_wq);
fail_free:
free_sbd(sdp);
sb->s_fs_info = NULL;
return error;
}
/**
* gfs2_get_tree - Get the GFS2 superblock and root directory
* @fc: The filesystem context
*
* Returns: 0 or -errno on error
*/
static int gfs2_get_tree(struct fs_context *fc)
{
struct gfs2_args *args = fc->fs_private;
struct gfs2_sbd *sdp;
int error;
error = get_tree_bdev(fc, gfs2_fill_super);
if (error)
return error;
sdp = fc->root->d_sb->s_fs_info;
dput(fc->root);
if (args->ar_meta)
fc->root = dget(sdp->sd_master_dir);
else
fc->root = dget(sdp->sd_root_dir);
return 0;
}
static void gfs2_fc_free(struct fs_context *fc)
{
struct gfs2_args *args = fc->fs_private;
kfree(args);
}
enum gfs2_param {
Opt_lockproto,
Opt_locktable,
Opt_hostdata,
Opt_spectator,
Opt_ignore_local_fs,
Opt_localflocks,
Opt_localcaching,
Opt_debug,
Opt_upgrade,
Opt_acl,
Opt_quota,
Opt_quota_flag,
Opt_suiddir,
Opt_data,
Opt_meta,
Opt_discard,
Opt_commit,
Opt_errors,
Opt_statfs_quantum,
Opt_statfs_percent,
Opt_quota_quantum,
Opt_barrier,
Opt_rgrplvb,
Opt_loccookie,
};
static const struct constant_table gfs2_param_quota[] = {
{"off", GFS2_QUOTA_OFF},
{"account", GFS2_QUOTA_ACCOUNT},
{"on", GFS2_QUOTA_ON},
{"quiet", GFS2_QUOTA_QUIET},
{}
};
enum opt_data {
Opt_data_writeback = GFS2_DATA_WRITEBACK,
Opt_data_ordered = GFS2_DATA_ORDERED,
};
static const struct constant_table gfs2_param_data[] = {
{"writeback", Opt_data_writeback },
{"ordered", Opt_data_ordered },
{}
};
enum opt_errors {
Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
Opt_errors_panic = GFS2_ERRORS_PANIC,
};
static const struct constant_table gfs2_param_errors[] = {
{"withdraw", Opt_errors_withdraw },
{"panic", Opt_errors_panic },
{}
};
static const struct fs_parameter_spec gfs2_fs_parameters[] = {
fsparam_string ("lockproto", Opt_lockproto),
fsparam_string ("locktable", Opt_locktable),
fsparam_string ("hostdata", Opt_hostdata),
fsparam_flag ("spectator", Opt_spectator),
fsparam_flag ("norecovery", Opt_spectator),
fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
fsparam_flag ("localflocks", Opt_localflocks),
fsparam_flag ("localcaching", Opt_localcaching),
fsparam_flag_no("debug", Opt_debug),
fsparam_flag ("upgrade", Opt_upgrade),
fsparam_flag_no("acl", Opt_acl),
fsparam_flag_no("suiddir", Opt_suiddir),
fsparam_enum ("data", Opt_data, gfs2_param_data),
fsparam_flag ("meta", Opt_meta),
fsparam_flag_no("discard", Opt_discard),
fsparam_s32 ("commit", Opt_commit),
fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
fsparam_s32 ("statfs_percent", Opt_statfs_percent),
fsparam_s32 ("quota_quantum", Opt_quota_quantum),
fsparam_flag_no("barrier", Opt_barrier),
fsparam_flag_no("rgrplvb", Opt_rgrplvb),
fsparam_flag_no("loccookie", Opt_loccookie),
/* quota can be a flag or an enum so it gets special treatment */
fsparam_flag_no("quota", Opt_quota_flag),
fsparam_enum("quota", Opt_quota, gfs2_param_quota),
{}
};
/* Parse a single mount parameter */
static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct gfs2_args *args = fc->fs_private;
struct fs_parse_result result;
int o;
o = fs_parse(fc, gfs2_fs_parameters, param, &result);
if (o < 0)
return o;
switch (o) {
case Opt_lockproto:
strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
break;
case Opt_locktable:
strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
break;
case Opt_hostdata:
strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
break;
case Opt_spectator:
args->ar_spectator = 1;
break;
case Opt_ignore_local_fs:
/* Retained for backwards compat only */
break;
case Opt_localflocks:
args->ar_localflocks = 1;
break;
case Opt_localcaching:
/* Retained for backwards compat only */
break;
case Opt_debug:
if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
args->ar_debug = result.boolean;
break;
case Opt_upgrade:
/* Retained for backwards compat only */
break;
case Opt_acl:
args->ar_posix_acl = result.boolean;
break;
case Opt_quota_flag:
args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
break;
case Opt_quota:
args->ar_quota = result.int_32;
break;
case Opt_suiddir:
args->ar_suiddir = result.boolean;
break;
case Opt_data:
/* The uint_32 result maps directly to GFS2_DATA_* */
args->ar_data = result.uint_32;
break;
case Opt_meta:
args->ar_meta = 1;
break;
case Opt_discard:
args->ar_discard = result.boolean;
break;
case Opt_commit:
if (result.int_32 <= 0)
return invalfc(fc, "commit mount option requires a positive numeric argument");
args->ar_commit = result.int_32;
break;
case Opt_statfs_quantum:
if (result.int_32 < 0)
return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
args->ar_statfs_quantum = result.int_32;
break;
case Opt_quota_quantum:
if (result.int_32 <= 0)
return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
args->ar_quota_quantum = result.int_32;
break;
case Opt_statfs_percent:
if (result.int_32 < 0 || result.int_32 > 100)
return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
args->ar_statfs_percent = result.int_32;
break;
case Opt_errors:
if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
args->ar_errors = result.uint_32;
break;
case Opt_barrier:
args->ar_nobarrier = result.boolean;
break;
case Opt_rgrplvb:
args->ar_rgrplvb = result.boolean;
args->ar_got_rgrplvb = 1;
break;
case Opt_loccookie:
args->ar_loccookie = result.boolean;
break;
default:
return invalfc(fc, "invalid mount option: %s", param->key);
}
return 0;
}
static int gfs2_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_args *oldargs = &sdp->sd_args;
struct gfs2_args *newargs = fc->fs_private;
struct gfs2_tune *gt = &sdp->sd_tune;
int error = 0;
sync_filesystem(sb);
spin_lock(>->gt_spin);
oldargs->ar_commit = gt->gt_logd_secs;
oldargs->ar_quota_quantum = gt->gt_quota_quantum;
if (gt->gt_statfs_slow)
oldargs->ar_statfs_quantum = 0;
else
oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
spin_unlock(>->gt_spin);
if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
errorfc(fc, "reconfiguration of locking protocol not allowed");
return -EINVAL;
}
if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
errorfc(fc, "reconfiguration of lock table not allowed");
return -EINVAL;
}
if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
errorfc(fc, "reconfiguration of host data not allowed");
return -EINVAL;
}
if (newargs->ar_spectator != oldargs->ar_spectator) {
errorfc(fc, "reconfiguration of spectator mode not allowed");
return -EINVAL;
}
if (newargs->ar_localflocks != oldargs->ar_localflocks) {
errorfc(fc, "reconfiguration of localflocks not allowed");
return -EINVAL;
}
if (newargs->ar_meta != oldargs->ar_meta) {
errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
return -EINVAL;
}
if (oldargs->ar_spectator)
fc->sb_flags |= SB_RDONLY;
if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
if (fc->sb_flags & SB_RDONLY) {
gfs2_make_fs_ro(sdp);
} else {
error = gfs2_make_fs_rw(sdp);
if (error)
errorfc(fc, "unable to remount read-write");
}
}
sdp->sd_args = *newargs;
if (sdp->sd_args.ar_posix_acl)
sb->s_flags |= SB_POSIXACL;
else
sb->s_flags &= ~SB_POSIXACL;
if (sdp->sd_args.ar_nobarrier)
set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
else
clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
spin_lock(>->gt_spin);
gt->gt_logd_secs = newargs->ar_commit;
gt->gt_quota_quantum = newargs->ar_quota_quantum;
if (newargs->ar_statfs_quantum) {
gt->gt_statfs_slow = 0;
gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
}
else {
gt->gt_statfs_slow = 1;
gt->gt_statfs_quantum = 30;
}
spin_unlock(>->gt_spin);
gfs2_online_uevent(sdp);
return error;
}
static const struct fs_context_operations gfs2_context_ops = {
.free = gfs2_fc_free,
.parse_param = gfs2_parse_param,
.get_tree = gfs2_get_tree,
.reconfigure = gfs2_reconfigure,
};
/* Set up the filesystem mount context */
static int gfs2_init_fs_context(struct fs_context *fc)
{
struct gfs2_args *args;
args = kmalloc(sizeof(*args), GFP_KERNEL);
if (args == NULL)
return -ENOMEM;
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
*args = sdp->sd_args;
} else {
memset(args, 0, sizeof(*args));
args->ar_quota = GFS2_QUOTA_DEFAULT;
args->ar_data = GFS2_DATA_DEFAULT;
args->ar_commit = 30;
args->ar_statfs_quantum = 30;
args->ar_quota_quantum = 60;
args->ar_errors = GFS2_ERRORS_DEFAULT;
}
fc->fs_private = args;
fc->ops = &gfs2_context_ops;
return 0;
}
static int set_meta_super(struct super_block *s, struct fs_context *fc)
{
return -EINVAL;
}
static int test_meta_super(struct super_block *s, struct fs_context *fc)
{
return (fc->sget_key == s->s_bdev);
}
static int gfs2_meta_get_tree(struct fs_context *fc)
{
struct super_block *s;
struct gfs2_sbd *sdp;
struct path path;
int error;
if (!fc->source || !*fc->source)
return -EINVAL;
error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
if (error) {
pr_warn("path_lookup on %s returned error %d\n",
fc->source, error);
return error;
}
fc->fs_type = &gfs2_fs_type;
fc->sget_key = path.dentry->d_sb->s_bdev;
s = sget_fc(fc, test_meta_super, set_meta_super);
path_put(&path);
if (IS_ERR(s)) {
pr_warn("gfs2 mount does not exist\n");
return PTR_ERR(s);
}
if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
deactivate_locked_super(s);
return -EBUSY;
}
sdp = s->s_fs_info;
fc->root = dget(sdp->sd_master_dir);
return 0;
}
static const struct fs_context_operations gfs2_meta_context_ops = {
.free = gfs2_fc_free,
.get_tree = gfs2_meta_get_tree,
};
static int gfs2_meta_init_fs_context(struct fs_context *fc)
{
int ret = gfs2_init_fs_context(fc);
if (ret)
return ret;
fc->ops = &gfs2_meta_context_ops;
return 0;
}
/**
* gfs2_evict_inodes - evict inodes cooperatively
* @sb: the superblock
*
* When evicting an inode with a zero link count, we are trying to upgrade the
* inode's iopen glock from SH to EX mode in order to determine if we can
* delete the inode. The other nodes are supposed to evict the inode from
* their caches if they can, and to poke the inode's inode glock if they cannot
* do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed
* quickly, but if the other nodes are not cooperating, the lock upgrading
* attempt will time out. Since inodes are evicted sequentially, this can add
* up quickly.
*
* Function evict_inodes() tries to keep the s_inode_list_lock list locked over
* a long time, which prevents other inodes from being evicted concurrently.
* This precludes the cooperative behavior we are looking for. This special
* version of evict_inodes() avoids that.
*
* Modeled after drop_pagecache_sb().
*/
static void gfs2_evict_inodes(struct super_block *sb)
{
struct inode *inode, *toput_inode = NULL;
struct gfs2_sbd *sdp = sb->s_fs_info;
set_bit(SDF_EVICTING, &sdp->sd_flags);
spin_lock(&sb->s_inode_list_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
spin_lock(&inode->i_lock);
if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
!need_resched()) {
spin_unlock(&inode->i_lock);
continue;
}
atomic_inc(&inode->i_count);
spin_unlock(&inode->i_lock);
spin_unlock(&sb->s_inode_list_lock);
iput(toput_inode);
toput_inode = inode;
cond_resched();
spin_lock(&sb->s_inode_list_lock);
}
spin_unlock(&sb->s_inode_list_lock);
iput(toput_inode);
}
static void gfs2_kill_sb(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
if (sdp == NULL) {
kill_block_super(sb);
return;
}
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
dput(sdp->sd_root_dir);
dput(sdp->sd_master_dir);
sdp->sd_root_dir = NULL;
sdp->sd_master_dir = NULL;
shrink_dcache_sb(sb);
gfs2_evict_inodes(sb);
/*
* Flush and then drain the delete workqueue here (via
* destroy_workqueue()) to ensure that any delete work that
* may be running will also see the SDF_KILL flag.
*/
set_bit(SDF_KILL, &sdp->sd_flags);
gfs2_flush_delete_work(sdp);
destroy_workqueue(sdp->sd_delete_wq);
kill_block_super(sb);
}
struct file_system_type gfs2_fs_type = {
.name = "gfs2",
.fs_flags = FS_REQUIRES_DEV,
.init_fs_context = gfs2_init_fs_context,
.parameters = gfs2_fs_parameters,
.kill_sb = gfs2_kill_sb,
.owner = THIS_MODULE,
};
MODULE_ALIAS_FS("gfs2");
struct file_system_type gfs2meta_fs_type = {
.name = "gfs2meta",
.fs_flags = FS_REQUIRES_DEV,
.init_fs_context = gfs2_meta_init_fs_context,
.owner = THIS_MODULE,
};
MODULE_ALIAS_FS("gfs2meta");