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Message-ID: <63ADC13FD55D6546B7DECE290D39E373F290E6DD@H3CMLB12-EX.srv.huawei-3com.com>
Date: Wed, 10 Jan 2018 06:40:22 +0000
From: Changwei Ge <ge.changwei@....com>
To: Gang He <ghe@...e.com>,
"mfasheh@...sity.com" <mfasheh@...sity.com>,
"jlbec@...lplan.org" <jlbec@...lplan.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>
Subject: Re: [Ocfs2-devel] [PATCH v2 1/2] ocfs2: add trimfs dlm lock resource
Hi Gang,
On 2017/12/14 13:16, Gang He wrote:
> Introduce a new dlm lock resource, which will be used to
> communicate during fstrim a ocfs2 device from cluster nodes.
>
> Signed-off-by: Gang He <ghe@...e.com>
> ---
> fs/ocfs2/dlmglue.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
> fs/ocfs2/dlmglue.h | 29 +++++++++++++++++
> fs/ocfs2/ocfs2.h | 1 +
> fs/ocfs2/ocfs2_lockid.h | 5 +++
> 4 files changed, 121 insertions(+)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 4689940..5615747 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -259,6 +259,10 @@ struct ocfs2_lock_res_ops {
> .flags = 0,
> };
>
> +static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = {
> + .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
Um, I don't think it is proper to add flag LOCK_TYPE_REQUIRES_REFRESH.
Because it seems that trimfs procedure doesn't have to persist stuff into disk.
Thanks,
Changwei
> +};
> +
> static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
> .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
> };
> @@ -676,6 +680,24 @@ static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res,
> &ocfs2_nfs_sync_lops, osb);
> }
>
> +void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb)
> +{
> + struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres;
> +
> + ocfs2_lock_res_init_once(lockres);
> + ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name);
> + ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS,
> + &ocfs2_trim_fs_lops, osb);
> +}
> +
> +void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb)
> +{
> + struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres;
> +
> + ocfs2_simple_drop_lockres(osb, lockres);
> + ocfs2_lock_res_free(lockres);
> +}
> +
> static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res,
> struct ocfs2_super *osb)
> {
> @@ -2745,6 +2767,70 @@ void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex)
> ex ? LKM_EXMODE : LKM_PRMODE);
> }
>
> +int ocfs2_trim_fs_lock(struct ocfs2_super *osb,
> + struct ocfs2_trim_fs_info *info, int trylock)
> +{
> + int status;
> + struct ocfs2_trim_fs_lvb *lvb;
> + struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres;
> +
> + if (info)
> + info->tf_valid = 0;
> +
> + if (ocfs2_is_hard_readonly(osb))
> + return -EROFS;
> +
> + if (ocfs2_mount_local(osb))
> + return 0;
> +
> + status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX,
> + trylock ? DLM_LKF_NOQUEUE : 0, 0);
> + if (status < 0) {
> + if (status != -EAGAIN)
> + mlog_errno(status);
> + return status;
> + }
> +
> + if (info) {
> + lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
> + if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
> + lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) {
> + info->tf_valid = 1;
> + info->tf_success = lvb->lvb_success;
> + info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum);
> + info->tf_start = be64_to_cpu(lvb->lvb_start);
> + info->tf_len = be64_to_cpu(lvb->lvb_len);
> + info->tf_minlen = be64_to_cpu(lvb->lvb_minlen);
> + info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen);
> + }
> + }
> +
> + return status;
> +}
> +
> +void ocfs2_trim_fs_unlock(struct ocfs2_super *osb,
> + struct ocfs2_trim_fs_info *info)
> +{
> + struct ocfs2_trim_fs_lvb *lvb;
> + struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres;
> +
> + if (ocfs2_mount_local(osb))
> + return;
> +
> + if (info) {
> + lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
> + lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION;
> + lvb->lvb_success = info->tf_success;
> + lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum);
> + lvb->lvb_start = cpu_to_be64(info->tf_start);
> + lvb->lvb_len = cpu_to_be64(info->tf_len);
> + lvb->lvb_minlen = cpu_to_be64(info->tf_minlen);
> + lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen);
> + }
> +
> + ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
> +}
> +
> int ocfs2_dentry_lock(struct dentry *dentry, int ex)
> {
> int ret;
> diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
> index a7fc18b..2253688 100644
> --- a/fs/ocfs2/dlmglue.h
> +++ b/fs/ocfs2/dlmglue.h
> @@ -70,6 +70,29 @@ struct ocfs2_orphan_scan_lvb {
> __be32 lvb_os_seqno;
> };
>
> +#define OCFS2_TRIMFS_LVB_VERSION 1
> +
> +struct ocfs2_trim_fs_lvb {
> + __u8 lvb_version;
> + __u8 lvb_success;
> + __u8 lvb_reserved[2];
> + __be32 lvb_nodenum;
> + __be64 lvb_start;
> + __be64 lvb_len;
> + __be64 lvb_minlen;
> + __be64 lvb_trimlen;
> +};
> +
> +struct ocfs2_trim_fs_info {
> + u8 tf_valid; /* lvb is valid, or not */
> + u8 tf_success; /* trim is successful, or not */
> + u32 tf_nodenum; /* osb node number */
> + u64 tf_start; /* trim start offset in clusters */
> + u64 tf_len; /* trim end offset in clusters */
> + u64 tf_minlen; /* trim minimum contiguous free clusters */
> + u64 tf_trimlen; /* trimmed length in bytes */
> +};
> +
> struct ocfs2_lock_holder {
> struct list_head oh_list;
> struct pid *oh_owner_pid;
> @@ -153,6 +176,12 @@ void ocfs2_super_unlock(struct ocfs2_super *osb,
> void ocfs2_rename_unlock(struct ocfs2_super *osb);
> int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
> void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
> +void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb);
> +void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb);
> +int ocfs2_trim_fs_lock(struct ocfs2_super *osb,
> + struct ocfs2_trim_fs_info *info, int trylock);
> +void ocfs2_trim_fs_unlock(struct ocfs2_super *osb,
> + struct ocfs2_trim_fs_info *info);
> int ocfs2_dentry_lock(struct dentry *dentry, int ex);
> void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
> int ocfs2_file_lock(struct file *file, int ex, int trylock);
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index 9a50f22..6867eef 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -404,6 +404,7 @@ struct ocfs2_super
> struct ocfs2_lock_res osb_super_lockres;
> struct ocfs2_lock_res osb_rename_lockres;
> struct ocfs2_lock_res osb_nfs_sync_lockres;
> + struct ocfs2_lock_res osb_trim_fs_lockres;
> struct ocfs2_dlm_debug *osb_dlm_debug;
>
> struct dentry *osb_debug_root;
> diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
> index d277aab..7051b99 100644
> --- a/fs/ocfs2/ocfs2_lockid.h
> +++ b/fs/ocfs2/ocfs2_lockid.h
> @@ -50,6 +50,7 @@ enum ocfs2_lock_type {
> OCFS2_LOCK_TYPE_NFS_SYNC,
> OCFS2_LOCK_TYPE_ORPHAN_SCAN,
> OCFS2_LOCK_TYPE_REFCOUNT,
> + OCFS2_LOCK_TYPE_TRIM_FS,
> OCFS2_NUM_LOCK_TYPES
> };
>
> @@ -93,6 +94,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
> case OCFS2_LOCK_TYPE_REFCOUNT:
> c = 'T';
> break;
> + case OCFS2_LOCK_TYPE_TRIM_FS:
> + c = 'I';
> + break;
> default:
> c = '\0';
> }
> @@ -115,6 +119,7 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
> [OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
> [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
> [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
> + [OCFS2_LOCK_TYPE_TRIM_FS] = "TrimFs",
> };
>
> static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
>
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