linux/fs/gfs2/glops.c
Linus Torvalds f2c80837e2 Changes in gfs2:
- Fix some compiler and kernel-doc warnings.
 
 - Various minor cleanups and optimizations.
 
 - Add a new sysfs gfs2 status file with some filesystem wide
   information.
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Merge tag 'gfs2-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 updates from Andreas Gruenbacher:

 - Fix some compiler and kernel-doc warnings

 - Various minor cleanups and optimizations

 - Add a new sysfs gfs2 status file with some filesystem wide
   information

* tag 'gfs2-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Fix fall-through warnings for Clang
  gfs2: Fix a number of kernel-doc warnings
  gfs2: Make gfs2_setattr_simple static
  gfs2: Add new sysfs file for gfs2 status
  gfs2: Silence possible null pointer dereference warning
  gfs2: Turn gfs2_meta_indirect_buffer into gfs2_meta_buffer
  gfs2: Replace gfs2_lblk_to_dblk with gfs2_get_extent
  gfs2: Turn gfs2_extent_map into gfs2_{get,alloc}_extent
  gfs2: Add new gfs2_iomap_get helper
  gfs2: Remove unused variable sb_format
  gfs2: Fix dir.c function parameter descriptions
  gfs2: Eliminate gh parameter from go_xmote_bh func
  gfs2: don't create empty buffers for NO_CREATE
2021-04-29 10:33:35 -07:00

808 lines
21 KiB
C

// 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.
*/
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/posix_acl.h>
#include <linux/security.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "recovery.h"
#include "rgrp.h"
#include "util.h"
#include "trans.h"
#include "dir.h"
#include "lops.h"
struct workqueue_struct *gfs2_freeze_wq;
extern struct workqueue_struct *gfs2_control_wq;
static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
{
fs_err(gl->gl_name.ln_sbd,
"AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
"state 0x%lx\n",
bh, (unsigned long long)bh->b_blocknr, bh->b_state,
bh->b_page->mapping, bh->b_page->flags);
fs_err(gl->gl_name.ln_sbd, "AIL glock %u:%llu mapping %p\n",
gl->gl_name.ln_type, gl->gl_name.ln_number,
gfs2_glock2aspace(gl));
gfs2_lm(gl->gl_name.ln_sbd, "AIL error\n");
gfs2_withdraw(gl->gl_name.ln_sbd);
}
/**
* __gfs2_ail_flush - remove all buffers for a given lock from the AIL
* @gl: the glock
* @fsync: set when called from fsync (not all buffers will be clean)
* @nr_revokes: Number of buffers to revoke
*
* None of the buffers should be dirty, locked, or pinned.
*/
static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
unsigned int nr_revokes)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct list_head *head = &gl->gl_ail_list;
struct gfs2_bufdata *bd, *tmp;
struct buffer_head *bh;
const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
gfs2_log_lock(sdp);
spin_lock(&sdp->sd_ail_lock);
list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
if (nr_revokes == 0)
break;
bh = bd->bd_bh;
if (bh->b_state & b_state) {
if (fsync)
continue;
gfs2_ail_error(gl, bh);
}
gfs2_trans_add_revoke(sdp, bd);
nr_revokes--;
}
GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
spin_unlock(&sdp->sd_ail_lock);
gfs2_log_unlock(sdp);
}
static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_trans tr;
unsigned int revokes;
int ret;
revokes = atomic_read(&gl->gl_ail_count);
if (!revokes) {
bool have_revokes;
bool log_in_flight;
/*
* We have nothing on the ail, but there could be revokes on
* the sdp revoke queue, in which case, we still want to flush
* the log and wait for it to finish.
*
* If the sdp revoke list is empty too, we might still have an
* io outstanding for writing revokes, so we should wait for
* it before returning.
*
* If none of these conditions are true, our revokes are all
* flushed and we can return.
*/
gfs2_log_lock(sdp);
have_revokes = !list_empty(&sdp->sd_log_revokes);
log_in_flight = atomic_read(&sdp->sd_log_in_flight);
gfs2_log_unlock(sdp);
if (have_revokes)
goto flush;
if (log_in_flight)
log_flush_wait(sdp);
return 0;
}
memset(&tr, 0, sizeof(tr));
set_bit(TR_ONSTACK, &tr.tr_flags);
ret = __gfs2_trans_begin(&tr, sdp, 0, revokes, _RET_IP_);
if (ret)
goto flush;
__gfs2_ail_flush(gl, 0, revokes);
gfs2_trans_end(sdp);
flush:
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_AIL_EMPTY_GL);
return 0;
}
void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
unsigned int revokes = atomic_read(&gl->gl_ail_count);
int ret;
if (!revokes)
return;
ret = gfs2_trans_begin(sdp, 0, revokes);
if (ret)
return;
__gfs2_ail_flush(gl, fsync, revokes);
gfs2_trans_end(sdp);
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_AIL_FLUSH);
}
/**
* gfs2_rgrp_metasync - sync out the metadata of a resource group
* @gl: the glock protecting the resource group
*
*/
static int gfs2_rgrp_metasync(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct address_space *metamapping = &sdp->sd_aspace;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
const unsigned bsize = sdp->sd_sb.sb_bsize;
loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
int error;
filemap_fdatawrite_range(metamapping, start, end);
error = filemap_fdatawait_range(metamapping, start, end);
WARN_ON_ONCE(error && !gfs2_withdrawn(sdp));
mapping_set_error(metamapping, error);
if (error)
gfs2_io_error(sdp);
return error;
}
/**
* rgrp_go_sync - sync out the metadata for this glock
* @gl: the glock
*
* Called when demoting or unlocking an EX glock. We must flush
* to disk all dirty buffers/pages relating to this glock, and must not
* return to caller to demote/unlock the glock until I/O is complete.
*/
static int rgrp_go_sync(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
int error;
if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
return 0;
GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_RGRP_GO_SYNC);
error = gfs2_rgrp_metasync(gl);
if (!error)
error = gfs2_ail_empty_gl(gl);
gfs2_free_clones(rgd);
return error;
}
/**
* rgrp_go_inval - invalidate the metadata for this glock
* @gl: the glock
* @flags:
*
* We never used LM_ST_DEFERRED with resource groups, so that we
* should always see the metadata flag set here.
*
*/
static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct address_space *mapping = &sdp->sd_aspace;
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
const unsigned bsize = sdp->sd_sb.sb_bsize;
loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
gfs2_rgrp_brelse(rgd);
WARN_ON_ONCE(!(flags & DIO_METADATA));
truncate_inode_pages_range(mapping, start, end);
rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
}
static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
const char *fs_id_buf)
{
struct gfs2_rgrpd *rgd = gl->gl_object;
if (rgd)
gfs2_rgrp_dump(seq, rgd, fs_id_buf);
}
static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
{
struct gfs2_inode *ip;
spin_lock(&gl->gl_lockref.lock);
ip = gl->gl_object;
if (ip)
set_bit(GIF_GLOP_PENDING, &ip->i_flags);
spin_unlock(&gl->gl_lockref.lock);
return ip;
}
struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
{
struct gfs2_rgrpd *rgd;
spin_lock(&gl->gl_lockref.lock);
rgd = gl->gl_object;
spin_unlock(&gl->gl_lockref.lock);
return rgd;
}
static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
{
if (!ip)
return;
clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
}
/**
* gfs2_inode_metasync - sync out the metadata of an inode
* @gl: the glock protecting the inode
*
*/
int gfs2_inode_metasync(struct gfs2_glock *gl)
{
struct address_space *metamapping = gfs2_glock2aspace(gl);
int error;
filemap_fdatawrite(metamapping);
error = filemap_fdatawait(metamapping);
if (error)
gfs2_io_error(gl->gl_name.ln_sbd);
return error;
}
/**
* inode_go_sync - Sync the dirty metadata of an inode
* @gl: the glock protecting the inode
*
*/
static int inode_go_sync(struct gfs2_glock *gl)
{
struct gfs2_inode *ip = gfs2_glock2inode(gl);
int isreg = ip && S_ISREG(ip->i_inode.i_mode);
struct address_space *metamapping = gfs2_glock2aspace(gl);
int error = 0, ret;
if (isreg) {
if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
inode_dio_wait(&ip->i_inode);
}
if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
goto out;
GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_INODE_GO_SYNC);
filemap_fdatawrite(metamapping);
if (isreg) {
struct address_space *mapping = ip->i_inode.i_mapping;
filemap_fdatawrite(mapping);
error = filemap_fdatawait(mapping);
mapping_set_error(mapping, error);
}
ret = gfs2_inode_metasync(gl);
if (!error)
error = ret;
gfs2_ail_empty_gl(gl);
/*
* Writeback of the data mapping may cause the dirty flag to be set
* so we have to clear it again here.
*/
smp_mb__before_atomic();
clear_bit(GLF_DIRTY, &gl->gl_flags);
out:
gfs2_clear_glop_pending(ip);
return error;
}
/**
* inode_go_inval - prepare a inode glock to be released
* @gl: the glock
* @flags:
*
* Normally we invalidate everything, but if we are moving into
* LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
* can keep hold of the metadata, since it won't have changed.
*
*/
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_inode *ip = gfs2_glock2inode(gl);
if (flags & DIO_METADATA) {
struct address_space *mapping = gfs2_glock2aspace(gl);
truncate_inode_pages(mapping, 0);
if (ip) {
set_bit(GIF_INVALID, &ip->i_flags);
forget_all_cached_acls(&ip->i_inode);
security_inode_invalidate_secctx(&ip->i_inode);
gfs2_dir_hash_inval(ip);
}
}
if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_INODE_GO_INVAL);
gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
}
if (ip && S_ISREG(ip->i_inode.i_mode))
truncate_inode_pages(ip->i_inode.i_mapping, 0);
gfs2_clear_glop_pending(ip);
}
/**
* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int inode_go_demote_ok(const struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
return 0;
return 1;
}
static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
{
const struct gfs2_dinode *str = buf;
struct timespec64 atime;
u16 height, depth;
umode_t mode = be32_to_cpu(str->di_mode);
bool is_new = ip->i_inode.i_flags & I_NEW;
if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
goto corrupt;
if (unlikely(!is_new && inode_wrong_type(&ip->i_inode, mode)))
goto corrupt;
ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
ip->i_inode.i_mode = mode;
if (is_new) {
ip->i_inode.i_rdev = 0;
switch (mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
be32_to_cpu(str->di_minor));
break;
}
}
i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
atime.tv_sec = be64_to_cpu(str->di_atime);
atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
if (timespec64_compare(&ip->i_inode.i_atime, &atime) < 0)
ip->i_inode.i_atime = atime;
ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
ip->i_goal = be64_to_cpu(str->di_goal_meta);
ip->i_generation = be64_to_cpu(str->di_generation);
ip->i_diskflags = be32_to_cpu(str->di_flags);
ip->i_eattr = be64_to_cpu(str->di_eattr);
/* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
gfs2_set_inode_flags(&ip->i_inode);
height = be16_to_cpu(str->di_height);
if (unlikely(height > GFS2_MAX_META_HEIGHT))
goto corrupt;
ip->i_height = (u8)height;
depth = be16_to_cpu(str->di_depth);
if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
goto corrupt;
ip->i_depth = (u8)depth;
ip->i_entries = be32_to_cpu(str->di_entries);
if (S_ISREG(ip->i_inode.i_mode))
gfs2_set_aops(&ip->i_inode);
return 0;
corrupt:
gfs2_consist_inode(ip);
return -EIO;
}
/**
* gfs2_inode_refresh - Refresh the incore copy of the dinode
* @ip: The GFS2 inode
*
* Returns: errno
*/
int gfs2_inode_refresh(struct gfs2_inode *ip)
{
struct buffer_head *dibh;
int error;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
error = gfs2_dinode_in(ip, dibh->b_data);
brelse(dibh);
clear_bit(GIF_INVALID, &ip->i_flags);
return error;
}
/**
* inode_go_lock - operation done after an inode lock is locked by a process
* @gh: The glock holder
*
* Returns: errno
*/
static int inode_go_lock(struct gfs2_holder *gh)
{
struct gfs2_glock *gl = gh->gh_gl;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_inode *ip = gl->gl_object;
int error = 0;
if (!ip || (gh->gh_flags & GL_SKIP))
return 0;
if (test_bit(GIF_INVALID, &ip->i_flags)) {
error = gfs2_inode_refresh(ip);
if (error)
return error;
}
if (gh->gh_state != LM_ST_DEFERRED)
inode_dio_wait(&ip->i_inode);
if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
(gl->gl_state == LM_ST_EXCLUSIVE) &&
(gh->gh_state == LM_ST_EXCLUSIVE)) {
spin_lock(&sdp->sd_trunc_lock);
if (list_empty(&ip->i_trunc_list))
list_add(&ip->i_trunc_list, &sdp->sd_trunc_list);
spin_unlock(&sdp->sd_trunc_lock);
wake_up(&sdp->sd_quota_wait);
return 1;
}
return error;
}
/**
* inode_go_dump - print information about an inode
* @seq: The iterator
* @gl: The glock
* @fs_id_buf: file system id (may be empty)
*
*/
static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
const char *fs_id_buf)
{
struct gfs2_inode *ip = gl->gl_object;
struct inode *inode = &ip->i_inode;
unsigned long nrpages;
if (ip == NULL)
return;
xa_lock_irq(&inode->i_data.i_pages);
nrpages = inode->i_data.nrpages;
xa_unlock_irq(&inode->i_data.i_pages);
gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
"p:%lu\n", fs_id_buf,
(unsigned long long)ip->i_no_formal_ino,
(unsigned long long)ip->i_no_addr,
IF2DT(ip->i_inode.i_mode), ip->i_flags,
(unsigned int)ip->i_diskflags,
(unsigned long long)i_size_read(inode), nrpages);
}
/**
* freeze_go_sync - promote/demote the freeze glock
* @gl: the glock
*/
static int freeze_go_sync(struct gfs2_glock *gl)
{
int error = 0;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
/*
* We need to check gl_state == LM_ST_SHARED here and not gl_req ==
* LM_ST_EXCLUSIVE. That's because when any node does a freeze,
* all the nodes should have the freeze glock in SH mode and they all
* call do_xmote: One for EX and the others for UN. They ALL must
* freeze locally, and they ALL must queue freeze work. The freeze_work
* calls freeze_func, which tries to reacquire the freeze glock in SH,
* effectively waiting for the thaw on the node who holds it in EX.
* Once thawed, the work func acquires the freeze glock in
* SH and everybody goes back to thawed.
*/
if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
!test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
error = freeze_super(sdp->sd_vfs);
if (error) {
fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
error);
if (gfs2_withdrawn(sdp)) {
atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
return 0;
}
gfs2_assert_withdraw(sdp, 0);
}
queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
GFS2_LFC_FREEZE_GO_SYNC);
else /* read-only mounts */
atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
}
return 0;
}
/**
* freeze_go_xmote_bh - After promoting/demoting the freeze glock
* @gl: the glock
*/
static int freeze_go_xmote_bh(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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;
if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
if (error)
gfs2_consist(sdp);
if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
gfs2_consist(sdp);
/* Initialize some head of the log stuff */
if (!gfs2_withdrawn(sdp)) {
sdp->sd_log_sequence = head.lh_sequence + 1;
gfs2_log_pointers_init(sdp, head.lh_blkno);
}
}
return 0;
}
/**
* freeze_go_demote_ok
* @gl: the glock
*
* Always returns 0
*/
static int freeze_go_demote_ok(const struct gfs2_glock *gl)
{
return 0;
}
/**
* iopen_go_callback - schedule the dcache entry for the inode to be deleted
* @gl: the glock
* @remote: true if this came from a different cluster node
*
* gl_lockref.lock lock is held while calling this
*/
static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
{
struct gfs2_inode *ip = gl->gl_object;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
if (!remote || sb_rdonly(sdp->sd_vfs))
return;
if (gl->gl_demote_state == LM_ST_UNLOCKED &&
gl->gl_state == LM_ST_SHARED && ip) {
gl->gl_lockref.count++;
if (!queue_delayed_work(gfs2_delete_workqueue,
&gl->gl_delete, 0))
gl->gl_lockref.count--;
}
}
static int iopen_go_demote_ok(const struct gfs2_glock *gl)
{
return !gfs2_delete_work_queued(gl);
}
/**
* inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
* @gl: glock being freed
*
* For now, this is only used for the journal inode glock. In withdraw
* situations, we need to wait for the glock to be freed so that we know
* other nodes may proceed with recovery / journal replay.
*/
static void inode_go_free(struct gfs2_glock *gl)
{
/* Note that we cannot reference gl_object because it's already set
* to NULL by this point in its lifecycle. */
if (!test_bit(GLF_FREEING, &gl->gl_flags))
return;
clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
wake_up_bit(&gl->gl_flags, GLF_FREEING);
}
/**
* nondisk_go_callback - used to signal when a node did a withdraw
* @gl: the nondisk glock
* @remote: true if this came from a different cluster node
*
*/
static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
/* Ignore the callback unless it's from another node, and it's the
live lock. */
if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
return;
/* First order of business is to cancel the demote request. We don't
* really want to demote a nondisk glock. At best it's just to inform
* us of another node's withdraw. We'll keep it in SH mode. */
clear_bit(GLF_DEMOTE, &gl->gl_flags);
clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
/* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
return;
/* We only care when a node wants us to unlock, because that means
* they want a journal recovered. */
if (gl->gl_demote_state != LM_ST_UNLOCKED)
return;
if (sdp->sd_args.ar_spectator) {
fs_warn(sdp, "Spectator node cannot recover journals.\n");
return;
}
fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
/*
* We can't call remote_withdraw directly here or gfs2_recover_journal
* because this is called from the glock unlock function and the
* remote_withdraw needs to enqueue and dequeue the same "live" glock
* we were called from. So we queue it to the control work queue in
* lock_dlm.
*/
queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
}
const struct gfs2_glock_operations gfs2_meta_glops = {
.go_type = LM_TYPE_META,
.go_flags = GLOF_NONDISK,
};
const struct gfs2_glock_operations gfs2_inode_glops = {
.go_sync = inode_go_sync,
.go_inval = inode_go_inval,
.go_demote_ok = inode_go_demote_ok,
.go_lock = inode_go_lock,
.go_dump = inode_go_dump,
.go_type = LM_TYPE_INODE,
.go_flags = GLOF_ASPACE | GLOF_LRU | GLOF_LVB,
.go_free = inode_go_free,
};
const struct gfs2_glock_operations gfs2_rgrp_glops = {
.go_sync = rgrp_go_sync,
.go_inval = rgrp_go_inval,
.go_lock = gfs2_rgrp_go_lock,
.go_dump = gfs2_rgrp_go_dump,
.go_type = LM_TYPE_RGRP,
.go_flags = GLOF_LVB,
};
const struct gfs2_glock_operations gfs2_freeze_glops = {
.go_sync = freeze_go_sync,
.go_xmote_bh = freeze_go_xmote_bh,
.go_demote_ok = freeze_go_demote_ok,
.go_type = LM_TYPE_NONDISK,
.go_flags = GLOF_NONDISK,
};
const struct gfs2_glock_operations gfs2_iopen_glops = {
.go_type = LM_TYPE_IOPEN,
.go_callback = iopen_go_callback,
.go_demote_ok = iopen_go_demote_ok,
.go_flags = GLOF_LRU | GLOF_NONDISK,
.go_subclass = 1,
};
const struct gfs2_glock_operations gfs2_flock_glops = {
.go_type = LM_TYPE_FLOCK,
.go_flags = GLOF_LRU | GLOF_NONDISK,
};
const struct gfs2_glock_operations gfs2_nondisk_glops = {
.go_type = LM_TYPE_NONDISK,
.go_flags = GLOF_NONDISK,
.go_callback = nondisk_go_callback,
};
const struct gfs2_glock_operations gfs2_quota_glops = {
.go_type = LM_TYPE_QUOTA,
.go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
};
const struct gfs2_glock_operations gfs2_journal_glops = {
.go_type = LM_TYPE_JOURNAL,
.go_flags = GLOF_NONDISK,
};
const struct gfs2_glock_operations *gfs2_glops_list[] = {
[LM_TYPE_META] = &gfs2_meta_glops,
[LM_TYPE_INODE] = &gfs2_inode_glops,
[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
[LM_TYPE_FLOCK] = &gfs2_flock_glops,
[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
[LM_TYPE_QUOTA] = &gfs2_quota_glops,
[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
};