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path: root/fs/gfs2/super.c
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Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c112
1 files changed, 75 insertions, 37 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index a346f56c4c6d..5b327f837de7 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -26,6 +26,7 @@
#include <linux/wait.h>
#include <linux/writeback.h>
#include <linux/backing-dev.h>
+#include <linux/kernel.h>
#include "gfs2.h"
#include "incore.h"
@@ -399,7 +400,7 @@ 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_holder thaw_gh;
+ struct gfs2_holder freeze_gh;
struct gfs2_log_header_host head;
int error;
@@ -408,7 +409,7 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
return error;
error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
- &thaw_gh);
+ &freeze_gh);
if (error)
goto fail_threads;
@@ -434,13 +435,13 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
- gfs2_glock_dq_uninit(&thaw_gh);
+ gfs2_glock_dq_uninit(&freeze_gh);
return 0;
fail:
- thaw_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&thaw_gh);
+ freeze_gh.gh_flags |= GL_NOCACHE;
+ gfs2_glock_dq_uninit(&freeze_gh);
fail_threads:
kthread_stop(sdp->sd_quotad_process);
kthread_stop(sdp->sd_logd_process);
@@ -580,14 +581,15 @@ int gfs2_statfs_sync(struct super_block *sb, int type)
struct buffer_head *m_bh, *l_bh;
int error;
+ sb_start_write(sb);
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
&gh);
if (error)
- return error;
+ goto out;
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
if (error)
- goto out;
+ goto out_unlock;
spin_lock(&sdp->sd_statfs_spin);
gfs2_statfs_change_in(m_sc, m_bh->b_data +
@@ -615,8 +617,10 @@ out_bh2:
brelse(l_bh);
out_bh:
brelse(m_bh);
-out:
+out_unlock:
gfs2_glock_dq_uninit(&gh);
+out:
+ sb_end_write(sb);
return error;
}
@@ -643,14 +647,8 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
struct lfcc *lfcc;
LIST_HEAD(list);
struct gfs2_log_header_host lh;
- struct gfs2_inode *dip = GFS2_I(sdp->sd_root_dir->d_inode);
int error;
- error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0,
- &sdp->sd_freeze_root_gh);
- if (error)
- return error;
- atomic_set(&sdp->sd_frozen_root, 1);
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
if (!lfcc) {
@@ -692,11 +690,6 @@ out:
gfs2_glock_dq_uninit(&lfcc->gh);
kfree(lfcc);
}
- if (error) {
- atomic_dec(&sdp->sd_frozen_root);
- wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
- gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
- }
return error;
}
@@ -834,18 +827,14 @@ out:
static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
{
- struct gfs2_holder thaw_gh;
+ struct gfs2_holder freeze_gh;
int error;
error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
- &thaw_gh);
+ &freeze_gh);
if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
return error;
- down_write(&sdp->sd_log_flush_lock);
- clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
- up_write(&sdp->sd_log_flush_lock);
-
kthread_stop(sdp->sd_quotad_process);
kthread_stop(sdp->sd_logd_process);
@@ -853,11 +842,16 @@ static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
gfs2_quota_sync(sdp->sd_vfs, 0);
gfs2_statfs_sync(sdp->sd_vfs, 0);
+ down_write(&sdp->sd_log_flush_lock);
+ clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
+ up_write(&sdp->sd_log_flush_lock);
+
gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
+ wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
- if (thaw_gh.gh_gl)
- gfs2_glock_dq_uninit(&thaw_gh);
+ if (freeze_gh.gh_gl)
+ gfs2_glock_dq_uninit(&freeze_gh);
gfs2_quota_cleanup(sdp);
@@ -943,11 +937,41 @@ 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 && sdp && !atomic_read(&sdp->sd_log_freeze))
+ if (wait && sdp)
gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
return 0;
}
+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_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
+ &freeze_gh);
+ if (error) {
+ printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
+ gfs2_assert_withdraw(sdp, 0);
+ }
+ else {
+ atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
+ error = thaw_super(sb);
+ if (error) {
+ printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
+ error);
+ gfs2_assert_withdraw(sdp, 0);
+ }
+ if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
+ freeze_gh.gh_flags |= GL_NOCACHE;
+ gfs2_glock_dq_uninit(&freeze_gh);
+ }
+ deactivate_super(sb);
+ return;
+}
+
/**
* gfs2_freeze - prevent further writes to the filesystem
* @sb: the VFS structure for the filesystem
@@ -957,10 +981,16 @@ static int gfs2_sync_fs(struct super_block *sb, int wait)
static int gfs2_freeze(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
- int error;
+ int error = 0;
- if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
- return -EINVAL;
+ mutex_lock(&sdp->sd_freeze_mutex);
+ if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
+ goto out;
+
+ if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
+ error = -EINVAL;
+ goto out;
+ }
for (;;) {
error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
@@ -980,7 +1010,10 @@ static int gfs2_freeze(struct super_block *sb)
fs_err(sdp, "retrying...\n");
msleep(1000);
}
- return 0;
+ error = 0;
+out:
+ mutex_unlock(&sdp->sd_freeze_mutex);
+ return error;
}
/**
@@ -993,10 +1026,15 @@ 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 ||
+ sdp->sd_freeze_gh.gh_gl == NULL) {
+ mutex_unlock(&sdp->sd_freeze_mutex);
+ return 0;
+ }
+
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
- atomic_dec(&sdp->sd_frozen_root);
- wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
- gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
+ mutex_unlock(&sdp->sd_freeze_mutex);
return 0;
}
@@ -1618,8 +1656,8 @@ const struct super_operations gfs2_super_ops = {
.evict_inode = gfs2_evict_inode,
.put_super = gfs2_put_super,
.sync_fs = gfs2_sync_fs,
- .freeze_fs = gfs2_freeze,
- .unfreeze_fs = gfs2_unfreeze,
+ .freeze_super = gfs2_freeze,
+ .thaw_super = gfs2_unfreeze,
.statfs = gfs2_statfs,
.remount_fs = gfs2_remount_fs,
.drop_inode = gfs2_drop_inode,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 20:26:50 +0000