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3427f2b2c5
linux/fs/gfs2/super.c
Bob Peterson 49462e2be1 gfs2: release iopen glock early in evict 
Before this patch, evict would clear the iopen glock's gl_object after
releasing the inode glock.  In the meantime, another process could reuse
the same block and thus glocks for a new inode.  It would lock the inode
glock (exclusively), and then the iopen glock (shared).  The shared
locking mode doesn't provide any ordering against the evict, so by the
time the iopen glock is reused, evict may not have gotten to setting
gl_object to NULL.

Fix that by releasing the iopen glock before the inode glock in
gfs2_evict_inode.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>gl_object
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2021-11-06 10:25:31 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bio.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/statfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/kernel.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "quota.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
#include "util.h"
#include "sys.h"
#include "xattr.h"
#include "lops.h"
enum dinode_demise {
SHOULD_DELETE_DINODE,
SHOULD_NOT_DELETE_DINODE,
SHOULD_DEFER_EVICTION,
};
/**
* gfs2_jindex_free - Clear all the journal index information
* @sdp: The GFS2 superblock
*
*/
void gfs2_jindex_free(struct gfs2_sbd *sdp)
{
struct list_head list;
struct gfs2_jdesc *jd;
spin_lock(&sdp->sd_jindex_spin);
list_add(&list, &sdp->sd_jindex_list);
list_del_init(&sdp->sd_jindex_list);
sdp->sd_journals = 0;
spin_unlock(&sdp->sd_jindex_spin);
sdp->sd_jdesc = NULL;
while (!list_empty(&list)) {
jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
gfs2_free_journal_extents(jd);
list_del(&jd->jd_list);
iput(jd->jd_inode);
jd->jd_inode = NULL;
kfree(jd);
}
}
static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
{
struct gfs2_jdesc *jd;
list_for_each_entry(jd, head, jd_list) {
if (jd->jd_jid == jid)
return jd;
}
return NULL;
}
struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
{
struct gfs2_jdesc *jd;
spin_lock(&sdp->sd_jindex_spin);
jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
spin_unlock(&sdp->sd_jindex_spin);
return jd;
}
int gfs2_jdesc_check(struct gfs2_jdesc *jd)
{
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
u64 size = i_size_read(jd->jd_inode);
if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
return -EIO;
jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
if (gfs2_write_alloc_required(ip, 0, size)) {
gfs2_consist_inode(ip);
return -EIO;
}
return 0;
}
/**
* gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
* @sdp: the filesystem
*
* Returns: errno
*/
int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
struct gfs2_glock *j_gl = ip->i_gl;
struct gfs2_log_header_host head;
int error;
j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
if (gfs2_withdrawn(sdp))
return -EIO;
error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
if (error || gfs2_withdrawn(sdp))
return error;
if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
gfs2_consist(sdp);
return -EIO;
}
/* Initialize some head of the log stuff */
sdp->sd_log_sequence = head.lh_sequence + 1;
gfs2_log_pointers_init(sdp, head.lh_blkno);
error = gfs2_quota_init(sdp);
if (!error && !gfs2_withdrawn(sdp))
set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
return error;
}
void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
{
const struct gfs2_statfs_change *str = buf;
sc->sc_total = be64_to_cpu(str->sc_total);
sc->sc_free = be64_to_cpu(str->sc_free);
sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
}
void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
{
struct gfs2_statfs_change *str = buf;
str->sc_total = cpu_to_be64(sc->sc_total);
str->sc_free = cpu_to_be64(sc->sc_free);
str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
}
int gfs2_statfs_init(struct gfs2_sbd *sdp)
{
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
struct buffer_head *m_bh;
struct gfs2_holder gh;
int error;
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
&gh);
if (error)
return error;
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
if (error)
goto out;
if (sdp->sd_args.ar_spectator) {
spin_lock(&sdp->sd_statfs_spin);
gfs2_statfs_change_in(m_sc, m_bh->b_data +
sizeof(struct gfs2_dinode));
spin_unlock(&sdp->sd_statfs_spin);
} else {
spin_lock(&sdp->sd_statfs_spin);
gfs2_statfs_change_in(m_sc, m_bh->b_data +
sizeof(struct gfs2_dinode));
gfs2_statfs_change_in(l_sc, sdp->sd_sc_bh->b_data +
sizeof(struct gfs2_dinode));
spin_unlock(&sdp->sd_statfs_spin);
}
brelse(m_bh);
out:
gfs2_glock_dq_uninit(&gh);
return 0;
}
void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
s64 dinodes)
{
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
s64 x, y;
int need_sync = 0;
gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
spin_lock(&sdp->sd_statfs_spin);
l_sc->sc_total += total;
l_sc->sc_free += free;
l_sc->sc_dinodes += dinodes;
gfs2_statfs_change_out(l_sc, sdp->sd_sc_bh->b_data +
sizeof(struct gfs2_dinode));
if (sdp->sd_args.ar_statfs_percent) {
x = 100 * l_sc->sc_free;
y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
if (x >= y || x <= -y)
need_sync = 1;
}
spin_unlock(&sdp->sd_statfs_spin);
if (need_sync)
gfs2_wake_up_statfs(sdp);
}
void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh)
{
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
gfs2_trans_add_meta(m_ip->i_gl, m_bh);
spin_lock(&sdp->sd_statfs_spin);
m_sc->sc_total += l_sc->sc_total;
m_sc->sc_free += l_sc->sc_free;
m_sc->sc_dinodes += l_sc->sc_dinodes;
memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
memset(sdp->sd_sc_bh->b_data + sizeof(struct gfs2_dinode),
0, sizeof(struct gfs2_statfs_change));
gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
spin_unlock(&sdp->sd_statfs_spin);
}
int gfs2_statfs_sync(struct super_block *sb, int type)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
struct gfs2_holder gh;
struct buffer_head *m_bh;
int error;
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
&gh);
if (error)
goto out;
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
if (error)
goto out_unlock;
spin_lock(&sdp->sd_statfs_spin);
gfs2_statfs_change_in(m_sc, m_bh->b_data +
sizeof(struct gfs2_dinode));
if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
spin_unlock(&sdp->sd_statfs_spin);
goto out_bh;
}
spin_unlock(&sdp->sd_statfs_spin);
error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
if (error)
goto out_bh;
update_statfs(sdp, m_bh);
sdp->sd_statfs_force_sync = 0;
gfs2_trans_end(sdp);
out_bh:
brelse(m_bh);
out_unlock:
gfs2_glock_dq_uninit(&gh);
out:
return error;
}
struct lfcc {
struct list_head list;
struct gfs2_holder gh;
};
/**
* gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
* journals are clean
* @sdp: the file system
*
* Returns: errno
*/
static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip;
struct gfs2_jdesc *jd;
struct lfcc *lfcc;
LIST_HEAD(list);
struct gfs2_log_header_host lh;
int error;
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
if (!lfcc) {
error = -ENOMEM;
goto out;
}
ip = GFS2_I(jd->jd_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
if (error) {
kfree(lfcc);
goto out;
}
list_add(&lfcc->list, &list);
}
error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
if (error)
goto out;
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
error = gfs2_jdesc_check(jd);
if (error)
break;
error = gfs2_find_jhead(jd, &lh, false);
if (error)
break;
if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
error = -EBUSY;
break;
}
}
if (error)
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
out:
while (!list_empty(&list)) {
lfcc = list_first_entry(&list, struct lfcc, list);
list_del(&lfcc->list);
gfs2_glock_dq_uninit(&lfcc->gh);
kfree(lfcc);
}
return error;
}
void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
{
struct gfs2_dinode *str = buf;
str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
str->di_goal_meta = cpu_to_be64(ip->i_goal);
str->di_goal_data = cpu_to_be64(ip->i_goal);
str->di_generation = cpu_to_be64(ip->i_generation);
str->di_flags = cpu_to_be32(ip->i_diskflags);
str->di_height = cpu_to_be16(ip->i_height);
str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
!(ip->i_diskflags & GFS2_DIF_EXHASH) ?
GFS2_FORMAT_DE : 0);
str->di_depth = cpu_to_be16(ip->i_depth);
str->di_entries = cpu_to_be32(ip->i_entries);
str->di_eattr = cpu_to_be64(ip->i_eattr);
str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
}
/**
* gfs2_write_inode - Make sure the inode is stable on the disk
* @inode: The inode
* @wbc: The writeback control structure
*
* Returns: errno
*/
static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
int ret = 0;
bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
if (flush_all)
gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_WRITE_INODE);
if (bdi->wb.dirty_exceeded)
gfs2_ail1_flush(sdp, wbc);
else
filemap_fdatawrite(metamapping);
if (flush_all)
ret = filemap_fdatawait(metamapping);
if (ret)
mark_inode_dirty_sync(inode);
else {
spin_lock(&inode->i_lock);
if (!(inode->i_flags & I_DIRTY))
gfs2_ordered_del_inode(ip);
spin_unlock(&inode->i_lock);
}
return ret;
}
/**
* gfs2_dirty_inode - check for atime updates
* @inode: The inode in question
* @flags: The type of dirty
*
* Unfortunately it can be called under any combination of inode
* glock and transaction lock, so we have to check carefully.
*
* At the moment this deals only with atime - it should be possible
* to expand that role in future, once a review of the locking has
* been carried out.
*/
static void gfs2_dirty_inode(struct inode *inode, int flags)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct buffer_head *bh;
struct gfs2_holder gh;
int need_unlock = 0;
int need_endtrans = 0;
int ret;
if (unlikely(gfs2_withdrawn(sdp)))
return;
if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (ret) {
fs_err(sdp, "dirty_inode: glock %d\n", ret);
gfs2_dump_glock(NULL, ip->i_gl, true);
return;
}
need_unlock = 1;
} else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
return;
if (current->journal_info == NULL) {
ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (ret) {
fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
goto out;
}
need_endtrans = 1;
}
ret = gfs2_meta_inode_buffer(ip, &bh);
if (ret == 0) {
gfs2_trans_add_meta(ip->i_gl, bh);
gfs2_dinode_out(ip, bh->b_data);
brelse(bh);
}
if (need_endtrans)
gfs2_trans_end(sdp);
out:
if (need_unlock)
gfs2_glock_dq_uninit(&gh);
}
/**
* gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
* @sdp: the filesystem
*
* Returns: errno
*/
void gfs2_make_fs_ro(struct gfs2_sbd *sdp)
{
int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
gfs2_flush_delete_work(sdp);
if (!log_write_allowed && current == sdp->sd_quotad_process)
fs_warn(sdp, "The quotad daemon is withdrawing.\n");
else if (sdp->sd_quotad_process)
kthread_stop(sdp->sd_quotad_process);
sdp->sd_quotad_process = NULL;
if (!log_write_allowed && current == sdp->sd_logd_process)
fs_warn(sdp, "The logd daemon is withdrawing.\n");
else if (sdp->sd_logd_process)
kthread_stop(sdp->sd_logd_process);
sdp->sd_logd_process = NULL;
if (log_write_allowed) {
gfs2_quota_sync(sdp->sd_vfs, 0);
gfs2_statfs_sync(sdp->sd_vfs, 0);
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
GFS2_LFC_MAKE_FS_RO);
wait_event_timeout(sdp->sd_log_waitq,
gfs2_log_is_empty(sdp),
HZ * 5);
gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp));
} else {
wait_event_timeout(sdp->sd_log_waitq,
gfs2_log_is_empty(sdp),
HZ * 5);
}
gfs2_quota_cleanup(sdp);
if (!log_write_allowed)
sdp->sd_vfs->s_flags |= SB_RDONLY;
}
/**
* gfs2_put_super - Unmount the filesystem
* @sb: The VFS superblock
*
*/
static void gfs2_put_super(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_jdesc *jd;
/* No more recovery requests */
set_bit(SDF_NORECOVERY, &sdp->sd_flags);
smp_mb();
/* Wait on outstanding recovery */
restart:
spin_lock(&sdp->sd_jindex_spin);
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
continue;
spin_unlock(&sdp->sd_jindex_spin);
wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
TASK_UNINTERRUPTIBLE);
goto restart;
}
spin_unlock(&sdp->sd_jindex_spin);
if (!sb_rdonly(sb)) {
gfs2_make_fs_ro(sdp);
}
WARN_ON(gfs2_withdrawing(sdp));
/* At this point, we're through modifying the disk */
/* Release stuff */
iput(sdp->sd_jindex);
iput(sdp->sd_statfs_inode);
iput(sdp->sd_rindex);
iput(sdp->sd_quota_inode);
gfs2_glock_put(sdp->sd_rename_gl);
gfs2_glock_put(sdp->sd_freeze_gl);
if (!sdp->sd_args.ar_spectator) {
if (gfs2_holder_initialized(&sdp->sd_journal_gh))
gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
brelse(sdp->sd_sc_bh);
gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
free_local_statfs_inodes(sdp);
iput(sdp->sd_qc_inode);
}
gfs2_glock_dq_uninit(&sdp->sd_live_gh);
gfs2_clear_rgrpd(sdp);
gfs2_jindex_free(sdp);
/* Take apart glock structures and buffer lists */
gfs2_gl_hash_clear(sdp);
truncate_inode_pages_final(&sdp->sd_aspace);
gfs2_delete_debugfs_file(sdp);
/* Unmount the locking protocol */
gfs2_lm_unmount(sdp);
/* At this point, we're through participating in the lockspace */
gfs2_sys_fs_del(sdp);
free_sbd(sdp);
}
/**
* gfs2_sync_fs - sync the filesystem
* @sb: the superblock
* @wait: true to wait for completion
*
* Flushes the log to disk.
*/
static int gfs2_sync_fs(struct super_block *sb, int wait)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
gfs2_quota_sync(sb, -1);
if (wait)
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_SYNC_FS);
return sdp->sd_log_error;
}
void gfs2_freeze_func(struct work_struct *work)
{
int error;
struct gfs2_holder freeze_gh;
struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
struct super_block *sb = sdp->sd_vfs;
atomic_inc(&sb->s_active);
error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
if (error) {
gfs2_assert_withdraw(sdp, 0);
} else {
atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
error = thaw_super(sb);
if (error) {
fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
error);
gfs2_assert_withdraw(sdp, 0);
}
gfs2_freeze_unlock(&freeze_gh);
}
deactivate_super(sb);
clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
return;
}
/**
* gfs2_freeze - prevent further writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
static int gfs2_freeze(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
int error;
mutex_lock(&sdp->sd_freeze_mutex);
if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) {
error = -EBUSY;
goto out;
}
for (;;) {
if (gfs2_withdrawn(sdp)) {
error = -EINVAL;
goto out;
}
error = gfs2_lock_fs_check_clean(sdp);
if (!error)
break;
if (error == -EBUSY)
fs_err(sdp, "waiting for recovery before freeze\n");
else if (error == -EIO) {
fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
"to recovery error.\n");
goto out;
} else {
fs_err(sdp, "error freezing FS: %d\n", error);
}
fs_err(sdp, "retrying...\n");
msleep(1000);
}
set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
out:
mutex_unlock(&sdp->sd_freeze_mutex);
return error;
}
/**
* gfs2_unfreeze - reallow writes to the filesystem
* @sb: the VFS structure for the filesystem
*
*/
static int gfs2_unfreeze(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
mutex_lock(&sdp->sd_freeze_mutex);
if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
!gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
mutex_unlock(&sdp->sd_freeze_mutex);
return -EINVAL;
}
gfs2_freeze_unlock(&sdp->sd_freeze_gh);
mutex_unlock(&sdp->sd_freeze_mutex);
return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
}
/**
* statfs_slow_fill - fill in the sg for a given RG
* @rgd: the RG
* @sc: the sc structure
*
* Returns: 0 on success, -ESTALE if the LVB is invalid
*/
static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
struct gfs2_statfs_change_host *sc)
{
gfs2_rgrp_verify(rgd);
sc->sc_total += rgd->rd_data;
sc->sc_free += rgd->rd_free;
sc->sc_dinodes += rgd->rd_dinodes;
return 0;
}
/**
* gfs2_statfs_slow - Stat a filesystem using asynchronous locking
* @sdp: the filesystem
* @sc: the sc info that will be returned
*
* Any error (other than a signal) will cause this routine to fall back
* to the synchronous version.
*
* FIXME: This really shouldn't busy wait like this.
*
* Returns: errno
*/
static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
{
struct gfs2_rgrpd *rgd_next;
struct gfs2_holder *gha, *gh;
unsigned int slots = 64;
unsigned int x;
int done;
int error = 0, err;
memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
if (!gha)
return -ENOMEM;
for (x = 0; x < slots; x++)
gfs2_holder_mark_uninitialized(gha + x);
rgd_next = gfs2_rgrpd_get_first(sdp);
for (;;) {
done = 1;
for (x = 0; x < slots; x++) {
gh = gha + x;
if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
err = gfs2_glock_wait(gh);
if (err) {
gfs2_holder_uninit(gh);
error = err;
} else {
if (!error) {
struct gfs2_rgrpd *rgd =
gfs2_glock2rgrp(gh->gh_gl);
error = statfs_slow_fill(rgd, sc);
}
gfs2_glock_dq_uninit(gh);
}
}
if (gfs2_holder_initialized(gh))
done = 0;
else if (rgd_next && !error) {
error = gfs2_glock_nq_init(rgd_next->rd_gl,
LM_ST_SHARED,
GL_ASYNC,
gh);
rgd_next = gfs2_rgrpd_get_next(rgd_next);
done = 0;
}
if (signal_pending(current))
error = -ERESTARTSYS;
}
if (done)
break;
yield();
}
kfree(gha);
return error;
}
/**
* gfs2_statfs_i - Do a statfs
* @sdp: the filesystem
* @sc: the sc structure
*
* Returns: errno
*/
static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
{
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
spin_lock(&sdp->sd_statfs_spin);
*sc = *m_sc;
sc->sc_total += l_sc->sc_total;
sc->sc_free += l_sc->sc_free;
sc->sc_dinodes += l_sc->sc_dinodes;
spin_unlock(&sdp->sd_statfs_spin);
if (sc->sc_free < 0)
sc->sc_free = 0;
if (sc->sc_free > sc->sc_total)
sc->sc_free = sc->sc_total;
if (sc->sc_dinodes < 0)
sc->sc_dinodes = 0;
return 0;
}
/**
* gfs2_statfs - Gather and return stats about the filesystem
* @dentry: The name of the link
* @buf: The buffer
*
* Returns: 0 on success or error code
*/
static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_statfs_change_host sc;
int error;
error = gfs2_rindex_update(sdp);
if (error)
return error;
if (gfs2_tune_get(sdp, gt_statfs_slow))
error = gfs2_statfs_slow(sdp, &sc);
else
error = gfs2_statfs_i(sdp, &sc);
if (error)
return error;
buf->f_type = GFS2_MAGIC;
buf->f_bsize = sdp->sd_sb.sb_bsize;
buf->f_blocks = sc.sc_total;
buf->f_bfree = sc.sc_free;
buf->f_bavail = sc.sc_free;
buf->f_files = sc.sc_dinodes + sc.sc_free;
buf->f_ffree = sc.sc_free;
buf->f_namelen = GFS2_FNAMESIZE;
return 0;
}
/**
* gfs2_drop_inode - Drop an inode (test for remote unlink)
* @inode: The inode to drop
*
* If we've received a callback on an iopen lock then it's because a
* remote node tried to deallocate the inode but failed due to this node
* still having the inode open. Here we mark the link count zero
* since we know that it must have reached zero if the GLF_DEMOTE flag
* is set on the iopen glock. If we didn't do a disk read since the
* remote node removed the final link then we might otherwise miss
* this event. This check ensures that this node will deallocate the
* inode's blocks, or alternatively pass the baton on to another
* node for later deallocation.
*/
static int gfs2_drop_inode(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
inode->i_nlink &&
gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
clear_nlink(inode);
}
/*
* When under memory pressure when an inode's link count has dropped to
* zero, defer deleting the inode to the delete workqueue. This avoids
* calling into DLM under memory pressure, which can deadlock.
*/
if (!inode->i_nlink &&
unlikely(current->flags & PF_MEMALLOC) &&
gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
gfs2_glock_hold(gl);
if (!gfs2_queue_delete_work(gl, 0))
gfs2_glock_queue_put(gl);
return 0;
}
return generic_drop_inode(inode);
}
static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
{
do {
if (d1 == d2)
return 1;
d1 = d1->d_parent;
} while (!IS_ROOT(d1));
return 0;
}
/**
* gfs2_show_options - Show mount options for /proc/mounts
* @s: seq_file structure
* @root: root of this (sub)tree
*
* Returns: 0 on success or error code
*/
static int gfs2_show_options(struct seq_file *s, struct dentry *root)
{
struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
struct gfs2_args *args = &sdp->sd_args;
int val;
if (is_ancestor(root, sdp->sd_master_dir))
seq_puts(s, ",meta");
if (args->ar_lockproto[0])
seq_show_option(s, "lockproto", args->ar_lockproto);
if (args->ar_locktable[0])
seq_show_option(s, "locktable", args->ar_locktable);
if (args->ar_hostdata[0])
seq_show_option(s, "hostdata", args->ar_hostdata);
if (args->ar_spectator)
seq_puts(s, ",spectator");
if (args->ar_localflocks)
seq_puts(s, ",localflocks");
if (args->ar_debug)
seq_puts(s, ",debug");
if (args->ar_posix_acl)
seq_puts(s, ",acl");
if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
char *state;
switch (args->ar_quota) {
case GFS2_QUOTA_OFF:
state = "off";
break;
case GFS2_QUOTA_ACCOUNT:
state = "account";
break;
case GFS2_QUOTA_ON:
state = "on";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",quota=%s", state);
}
if (args->ar_suiddir)
seq_puts(s, ",suiddir");
if (args->ar_data != GFS2_DATA_DEFAULT) {
char *state;
switch (args->ar_data) {
case GFS2_DATA_WRITEBACK:
state = "writeback";
break;
case GFS2_DATA_ORDERED:
state = "ordered";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",data=%s", state);
}
if (args->ar_discard)
seq_puts(s, ",discard");
val = sdp->sd_tune.gt_logd_secs;
if (val != 30)
seq_printf(s, ",commit=%d", val);
val = sdp->sd_tune.gt_statfs_quantum;
if (val != 30)
seq_printf(s, ",statfs_quantum=%d", val);
else if (sdp->sd_tune.gt_statfs_slow)
seq_puts(s, ",statfs_quantum=0");
val = sdp->sd_tune.gt_quota_quantum;
if (val != 60)
seq_printf(s, ",quota_quantum=%d", val);
if (args->ar_statfs_percent)
seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
const char *state;
switch (args->ar_errors) {
case GFS2_ERRORS_WITHDRAW:
state = "withdraw";
break;
case GFS2_ERRORS_PANIC:
state = "panic";
break;
default:
state = "unknown";
break;
}
seq_printf(s, ",errors=%s", state);
}
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
seq_puts(s, ",nobarrier");
if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
seq_puts(s, ",demote_interface_used");
if (args->ar_rgrplvb)
seq_puts(s, ",rgrplvb");
if (args->ar_loccookie)
seq_puts(s, ",loccookie");
return 0;
}
static void gfs2_final_release_pages(struct gfs2_inode *ip)
{
struct inode *inode = &ip->i_inode;
struct gfs2_glock *gl = ip->i_gl;
truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
truncate_inode_pages(&inode->i_data, 0);
if (atomic_read(&gl->gl_revokes) == 0) {
clear_bit(GLF_LFLUSH, &gl->gl_flags);
clear_bit(GLF_DIRTY, &gl->gl_flags);
}
}
static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *rgd;
struct gfs2_holder gh;
int error;
if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
gfs2_consist_inode(ip);
return -EIO;
}
error = gfs2_rindex_update(sdp);
if (error)
return error;
error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
if (error)
return error;
rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
if (!rgd) {
gfs2_consist_inode(ip);
error = -EIO;
goto out_qs;
}
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
LM_FLAG_NODE_SCOPE, &gh);
if (error)
goto out_qs;
error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
sdp->sd_jdesc->jd_blocks);
if (error)
goto out_rg_gunlock;
gfs2_free_di(rgd, ip);
gfs2_final_release_pages(ip);
gfs2_trans_end(sdp);
out_rg_gunlock:
gfs2_glock_dq_uninit(&gh);
out_qs:
gfs2_quota_unhold(ip);
return error;
}
/**
* gfs2_glock_put_eventually
* @gl: The glock to put
*
* When under memory pressure, trigger a deferred glock put to make sure we
* won't call into DLM and deadlock. Otherwise, put the glock directly.
*/
static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
{
if (current->flags & PF_MEMALLOC)
gfs2_glock_queue_put(gl);
else
gfs2_glock_put(gl);
}
static bool gfs2_upgrade_iopen_glock(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_holder *gh = &ip->i_iopen_gh;
long timeout = 5 * HZ;
int error;
gh->gh_flags |= GL_NOCACHE;
gfs2_glock_dq_wait(gh);
/*
* If there are no other lock holders, we'll get the lock immediately.
* Otherwise, the other nodes holding the lock will be notified about
* our locking request. If they don't have the inode open, they'll
* evict the cached inode and release the lock. Otherwise, if they
* poke the inode glock, we'll take this as an indication that they
* still need the iopen glock and that they'll take care of deleting
* the inode when they're done. As a last resort, if another node
* keeps holding the iopen glock without showing any activity on the
* inode glock, we'll eventually time out.
*
* Note that we're passing the LM_FLAG_TRY_1CB flag to the first
* locking request as an optimization to notify lock holders as soon as
* possible. Without that flag, they'd be notified implicitly by the
* second locking request.
*/
gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
error = gfs2_glock_nq(gh);
if (error != GLR_TRYFAILED)
return !error;
gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
error = gfs2_glock_nq(gh);
if (error)
return false;
timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
!test_bit(HIF_WAIT, &gh->gh_iflags) ||
test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
timeout);
if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
gfs2_glock_dq(gh);
return false;
}
return true;
}
/**
* evict_should_delete - determine whether the inode is eligible for deletion
* @inode: The inode to evict
* @gh: The glock holder structure
*
* This function determines whether the evicted inode is eligible to be deleted
* and locks the inode glock.
*
* Returns: the fate of the dinode
*/
static enum dinode_demise evict_should_delete(struct inode *inode,
struct gfs2_holder *gh)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct super_block *sb = inode->i_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
int ret;
if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
goto should_delete;
}
if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
return SHOULD_DEFER_EVICTION;
/* Deletes should never happen under memory pressure anymore. */
if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
return SHOULD_DEFER_EVICTION;
/* Must not read inode block until block type has been verified */
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
if (unlikely(ret)) {
glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
return SHOULD_DEFER_EVICTION;
}
if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
return SHOULD_NOT_DELETE_DINODE;
ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
if (ret)
return SHOULD_NOT_DELETE_DINODE;
if (test_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags)) {
ret = gfs2_instantiate(gh);
if (ret)
return SHOULD_NOT_DELETE_DINODE;
}
/*
* The inode may have been recreated in the meantime.
*/
if (inode->i_nlink)
return SHOULD_NOT_DELETE_DINODE;
should_delete:
if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
if (!gfs2_upgrade_iopen_glock(inode)) {
gfs2_holder_uninit(&ip->i_iopen_gh);
return SHOULD_NOT_DELETE_DINODE;
}
}
return SHOULD_DELETE_DINODE;
}
/**
* evict_unlinked_inode - delete the pieces of an unlinked evicted inode
* @inode: The inode to evict
*/
static int evict_unlinked_inode(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
int ret;
if (S_ISDIR(inode->i_mode) &&
(ip->i_diskflags & GFS2_DIF_EXHASH)) {
ret = gfs2_dir_exhash_dealloc(ip);
if (ret)
goto out;
}
if (ip->i_eattr) {
ret = gfs2_ea_dealloc(ip);
if (ret)
goto out;
}
if (!gfs2_is_stuffed(ip)) {
ret = gfs2_file_dealloc(ip);
if (ret)
goto out;
}
/* We're about to clear the bitmap for the dinode, but as soon as we
do, gfs2_create_inode can create another inode at the same block
location and try to set gl_object again. We clear gl_object here so
that subsequent inode creates don't see an old gl_object. */
glock_clear_object(ip->i_gl, ip);
ret = gfs2_dinode_dealloc(ip);
gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
out:
return ret;
}
/*
* evict_linked_inode - evict an inode whose dinode has not been unlinked
* @inode: The inode to evict
*/
static int evict_linked_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_inode *ip = GFS2_I(inode);
struct address_space *metamapping;
int ret;
gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_EVICT_INODE);
metamapping = gfs2_glock2aspace(ip->i_gl);
if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
filemap_fdatawrite(metamapping);
filemap_fdatawait(metamapping);
}
write_inode_now(inode, 1);
gfs2_ail_flush(ip->i_gl, 0);
ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
if (ret)
return ret;
/* Needs to be done before glock release & also in a transaction */
truncate_inode_pages(&inode->i_data, 0);
truncate_inode_pages(metamapping, 0);
gfs2_trans_end(sdp);
return 0;
}
/**
* gfs2_evict_inode - Remove an inode from cache
* @inode: The inode to evict
*
* There are three cases to consider:
* 1. i_nlink == 0, we are final opener (and must deallocate)
* 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
* 3. i_nlink > 0
*
* If the fs is read only, then we have to treat all cases as per #3
* since we are unable to do any deallocation. The inode will be
* deallocated by the next read/write node to attempt an allocation
* in the same resource group
*
* We have to (at the moment) hold the inodes main lock to cover
* the gap between unlocking the shared lock on the iopen lock and
* taking the exclusive lock. I'd rather do a shared -> exclusive
* conversion on the iopen lock, but we can change that later. This
* is safe, just less efficient.
*/
static void gfs2_evict_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int ret;
if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
clear_inode(inode);
return;
}
if (inode->i_nlink || sb_rdonly(sb))
goto out;
gfs2_holder_mark_uninitialized(&gh);
ret = evict_should_delete(inode, &gh);
if (ret == SHOULD_DEFER_EVICTION)
goto out;
if (ret == SHOULD_DELETE_DINODE)
ret = evict_unlinked_inode(inode);
else
ret = evict_linked_inode(inode);
if (gfs2_rs_active(&ip->i_res))
gfs2_rs_deltree(&ip->i_res);
if (gfs2_holder_initialized(&gh)) {
glock_clear_object(ip->i_gl, ip);
gfs2_glock_dq_uninit(&gh);
}
if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
out:
truncate_inode_pages_final(&inode->i_data);
if (ip->i_qadata)
gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
gfs2_rs_delete(ip, NULL);
gfs2_ordered_del_inode(ip);
clear_inode(inode);
gfs2_dir_hash_inval(ip);
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
glock_clear_object(gl, ip);
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
gfs2_glock_dq(&ip->i_iopen_gh);
}
gfs2_glock_hold(gl);
gfs2_holder_uninit(&ip->i_iopen_gh);
gfs2_glock_put_eventually(gl);
}
if (ip->i_gl) {
glock_clear_object(ip->i_gl, ip);
wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
gfs2_glock_add_to_lru(ip->i_gl);
gfs2_glock_put_eventually(ip->i_gl);
ip->i_gl = NULL;
}
}
static struct inode *gfs2_alloc_inode(struct super_block *sb)
{
struct gfs2_inode *ip;
ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
if (!ip)
return NULL;
ip->i_flags = 0;
ip->i_gl = NULL;
gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
memset(&ip->i_res, 0, sizeof(ip->i_res));
RB_CLEAR_NODE(&ip->i_res.rs_node);
ip->i_rahead = 0;
return &ip->i_inode;
}
static void gfs2_free_inode(struct inode *inode)
{
kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
}
extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
{
struct local_statfs_inode *lsi, *safe;
/* Run through the statfs inodes list to iput and free memory */
list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
sdp->sd_sc_inode = NULL; /* belongs to this node */
if (lsi->si_sc_inode)
iput(lsi->si_sc_inode);
list_del(&lsi->si_list);
kfree(lsi);
}
}
extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
unsigned int index)
{
struct local_statfs_inode *lsi;
/* Return the local (per node) statfs inode in the
* sdp->sd_sc_inodes_list corresponding to the 'index'. */
list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
if (lsi->si_jid == index)
return lsi->si_sc_inode;
}
return NULL;
}
const struct super_operations gfs2_super_ops = {
.alloc_inode = gfs2_alloc_inode,
.free_inode = gfs2_free_inode,
.write_inode = gfs2_write_inode,
.dirty_inode = gfs2_dirty_inode,
.evict_inode = gfs2_evict_inode,
.put_super = gfs2_put_super,
.sync_fs = gfs2_sync_fs,
.freeze_super = gfs2_freeze,
.thaw_super = gfs2_unfreeze,
.statfs = gfs2_statfs,
.drop_inode = gfs2_drop_inode,
.show_options = gfs2_show_options,
};
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