From: Bob Peterson rpeterso@redhat.com
[ Upstream commit c77b52c0a137994ad796f44544c802b0b766e496 ]
Many places in the gfs2 code queued and dequeued the freeze glock. Almost all of them acquire it in SHARED mode, and need to specify the same LM_FLAG_NOEXP and GL_EXACT flags.
This patch adds common helper functions gfs2_freeze_lock and gfs2_freeze_unlock to make the code more readable, and to prepare for the next patch.
Signed-off-by: Bob Peterson rpeterso@redhat.com Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/gfs2/ops_fstype.c | 6 ++---- fs/gfs2/recovery.c | 8 +++----- fs/gfs2/super.c | 42 ++++++++++++++---------------------------- fs/gfs2/util.c | 25 +++++++++++++++++++++++++ fs/gfs2/util.h | 3 +++ 5 files changed, 47 insertions(+), 37 deletions(-)
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 61fce59cb4d3..4ee56f5e93cb 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -1198,14 +1198,12 @@ static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) if (sb_rdonly(sb)) { struct gfs2_holder freeze_gh;
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, - LM_FLAG_NOEXP | GL_EXACT, - &freeze_gh); + error = gfs2_freeze_lock(sdp, &freeze_gh, 0); if (error) { fs_err(sdp, "can't make FS RO: %d\n", error); goto fail_per_node; } - gfs2_glock_dq_uninit(&freeze_gh); + gfs2_freeze_unlock(&freeze_gh); } else { error = gfs2_make_fs_rw(sdp); if (error) { diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c index a3c1911862f0..8f9c6480a5df 100644 --- a/fs/gfs2/recovery.c +++ b/fs/gfs2/recovery.c @@ -470,9 +470,7 @@ void gfs2_recover_func(struct work_struct *work)
/* Acquire a shared hold on the freeze lock */
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, - LM_FLAG_NOEXP | LM_FLAG_PRIORITY | - GL_EXACT, &thaw_gh); + error = gfs2_freeze_lock(sdp, &thaw_gh, LM_FLAG_PRIORITY); if (error) goto fail_gunlock_ji;
@@ -524,7 +522,7 @@ void gfs2_recover_func(struct work_struct *work) clean_journal(jd, &head); up_read(&sdp->sd_log_flush_lock);
- gfs2_glock_dq_uninit(&thaw_gh); + gfs2_freeze_unlock(&thaw_gh); t_rep = ktime_get(); fs_info(sdp, "jid=%u: Journal replayed in %lldms [jlck:%lldms, " "jhead:%lldms, tlck:%lldms, replay:%lldms]\n", @@ -546,7 +544,7 @@ void gfs2_recover_func(struct work_struct *work) goto done;
fail_gunlock_thaw: - gfs2_glock_dq_uninit(&thaw_gh); + gfs2_freeze_unlock(&thaw_gh); fail_gunlock_ji: if (jlocked) { gfs2_glock_dq_uninit(&ji_gh); diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 2f56acc41c04..ea312a94ce69 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -173,9 +173,7 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp) if (error) return error;
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, - LM_FLAG_NOEXP | GL_EXACT, - &freeze_gh); + error = gfs2_freeze_lock(sdp, &freeze_gh, 0); if (error) goto fail_threads;
@@ -205,12 +203,12 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
- gfs2_glock_dq_uninit(&freeze_gh); + gfs2_freeze_unlock(&freeze_gh);
return 0;
fail: - gfs2_glock_dq_uninit(&freeze_gh); + gfs2_freeze_unlock(&freeze_gh); fail_threads: if (sdp->sd_quotad_process) kthread_stop(sdp->sd_quotad_process); @@ -452,7 +450,7 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp) }
if (error) - gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); + gfs2_freeze_unlock(&sdp->sd_freeze_gh);
out: while (!list_empty(&list)) { @@ -616,21 +614,12 @@ int gfs2_make_fs_ro(struct gfs2_sbd *sdp) gfs2_holder_mark_uninitialized(&freeze_gh); if (sdp->sd_freeze_gl && !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) { - if (!log_write_allowed) { - error = gfs2_glock_nq_init(sdp->sd_freeze_gl, - LM_ST_SHARED, LM_FLAG_TRY | - LM_FLAG_NOEXP | GL_EXACT, - &freeze_gh); - if (error == GLR_TRYFAILED) - error = 0; - } else { - error = gfs2_glock_nq_init(sdp->sd_freeze_gl, - LM_ST_SHARED, - LM_FLAG_NOEXP | GL_EXACT, - &freeze_gh); - if (error && !gfs2_withdrawn(sdp)) - return error; - } + error = gfs2_freeze_lock(sdp, &freeze_gh, + log_write_allowed ? 0 : LM_FLAG_TRY); + if (error == GLR_TRYFAILED) + error = 0; + if (error && !gfs2_withdrawn(sdp)) + return error; }
gfs2_flush_delete_work(sdp); @@ -661,8 +650,7 @@ int gfs2_make_fs_ro(struct gfs2_sbd *sdp) atomic_read(&sdp->sd_reserving_log) == 0, HZ * 5); } - if (gfs2_holder_initialized(&freeze_gh)) - gfs2_glock_dq_uninit(&freeze_gh); + gfs2_freeze_unlock(&freeze_gh);
gfs2_quota_cleanup(sdp);
@@ -772,10 +760,8 @@ void gfs2_freeze_func(struct work_struct *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, - LM_FLAG_NOEXP | GL_EXACT, &freeze_gh); + error = gfs2_freeze_lock(sdp, &freeze_gh, 0); if (error) { - fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error); gfs2_assert_withdraw(sdp, 0); } else { atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); @@ -785,7 +771,7 @@ void gfs2_freeze_func(struct work_struct *work) error); gfs2_assert_withdraw(sdp, 0); } - gfs2_glock_dq_uninit(&freeze_gh); + gfs2_freeze_unlock(&freeze_gh); } deactivate_super(sb); clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); @@ -853,7 +839,7 @@ static int gfs2_unfreeze(struct super_block *sb) return 0; }
- gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); + 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); } diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c index 574bea29f21e..e6c93e811c3e 100644 --- a/fs/gfs2/util.c +++ b/fs/gfs2/util.c @@ -91,6 +91,31 @@ int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, return error; }
+/** + * gfs2_freeze_lock - hold the freeze glock + * @sdp: the superblock + * @freeze_gh: pointer to the requested holder + * @caller_flags: any additional flags needed by the caller + */ +int gfs2_freeze_lock(struct gfs2_sbd *sdp, struct gfs2_holder *freeze_gh, + int caller_flags) +{ + int flags = LM_FLAG_NOEXP | GL_EXACT | caller_flags; + int error; + + error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, flags, + freeze_gh); + if (error && error != GLR_TRYFAILED) + fs_err(sdp, "can't lock the freeze lock: %d\n", error); + return error; +} + +void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh) +{ + if (gfs2_holder_initialized(freeze_gh)) + gfs2_glock_dq_uninit(freeze_gh); +} + static void signal_our_withdraw(struct gfs2_sbd *sdp) { struct gfs2_glock *live_gl = sdp->sd_live_gh.gh_gl; diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h index a4443dd8a94b..69e1a0ae5a4d 100644 --- a/fs/gfs2/util.h +++ b/fs/gfs2/util.h @@ -149,6 +149,9 @@ int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function,
extern int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, bool verbose); +extern int gfs2_freeze_lock(struct gfs2_sbd *sdp, + struct gfs2_holder *freeze_gh, int caller_flags); +extern void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh);
#define gfs2_io_error(sdp) \ gfs2_io_error_i((sdp), __func__, __FILE__, __LINE__)