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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-btrfs@vger.kernel.org
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 2/3] btrfs: export currently executing exclusive operation via sysfs
Date: Mon, 27 Jul 2020 17:04:50 -0500	[thread overview]
Message-ID: <20200727220451.30680-3-rgoldwyn@suse.de> (raw)
In-Reply-To: <20200727220451.30680-1-rgoldwyn@suse.de>

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

/sys/fs/<fsid>/exclusive_operation contains the currently executing
exclusive operation. Add a sysfs_notify() when operation end, so
userspace can be notified of exclusive operation is finished.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/ioctl.c |  2 ++
 fs/btrfs/sysfs.c | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2f45b88d7eed..a00d6d5c42c1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -373,6 +373,8 @@ bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, int type)
 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
 {
 	atomic_set(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
+	sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL,
+			"exclusive_operation");
 }
 
 /*
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index a39bff64ff24..71950c121588 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -808,6 +808,30 @@ static ssize_t btrfs_checksum_show(struct kobject *kobj,
 
 BTRFS_ATTR(, checksum, btrfs_checksum_show);
 
+static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
+		struct kobj_attribute *a, char *buf)
+{
+	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
+	switch (atomic_read(&fs_info->exclusive_operation)) {
+		case  BTRFS_EXCLOP_NONE:
+			return scnprintf(buf, PAGE_SIZE, "none\n");
+		case BTRFS_EXCLOP_BALANCE:
+			return scnprintf(buf, PAGE_SIZE, "balance\n");
+		case BTRFS_EXCLOP_DEV_ADD:
+			return scnprintf(buf, PAGE_SIZE, "device add\n");
+		case BTRFS_EXCLOP_DEV_REPLACE:
+			return scnprintf(buf, PAGE_SIZE, "device replace\n");
+		case BTRFS_EXCLOP_DEV_REMOVE:
+			return scnprintf(buf, PAGE_SIZE, "device remove\n");
+		case BTRFS_EXCLOP_SWAP_ACTIVATE:
+			return scnprintf(buf, PAGE_SIZE, "swap activate\n");
+		case BTRFS_EXCLOP_RESIZE:
+			return scnprintf(buf, PAGE_SIZE, "resize\n");
+	}
+	return 0;
+}
+BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
+
 static const struct attribute *btrfs_attrs[] = {
 	BTRFS_ATTR_PTR(, label),
 	BTRFS_ATTR_PTR(, nodesize),
@@ -816,6 +840,7 @@ static const struct attribute *btrfs_attrs[] = {
 	BTRFS_ATTR_PTR(, quota_override),
 	BTRFS_ATTR_PTR(, metadata_uuid),
 	BTRFS_ATTR_PTR(, checksum),
+	BTRFS_ATTR_PTR(, exclusive_operation),
 	NULL,
 };
 
-- 
2.26.2


  parent reply	other threads:[~2020-07-27 22:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-27 22:04 [PATCH 0/3] btrfs: Enumerate and export exclusive operations Goldwyn Rodrigues
2020-07-27 22:04 ` [PATCH 1/3] btrfs: enumerate the type of exclusive operation in progress Goldwyn Rodrigues
2020-07-28  8:45   ` Johannes Thumshirn
2020-07-27 22:04 ` Goldwyn Rodrigues [this message]
2020-07-27 22:04 ` [PATCH 3/3] btrfs: add more information for balance Goldwyn Rodrigues
2020-07-27 22:08 ` [PATCH 1/4] btrfs-progs: get_fsid_fd() for getting fsid using fd Goldwyn Rodrigues
2020-07-27 22:08   ` [PATCH 2/4] btrfs-progs: add sysfs file reading functions Goldwyn Rodrigues
2020-07-27 22:08   ` [PATCH 3/4] btrfs-progs: Check for exclusive operation before issuing ioctl Goldwyn Rodrigues
2020-07-27 22:08   ` [PATCH 4/4] btrfs-progs: Enqueue command if it can't be performed immediately Goldwyn Rodrigues
2020-07-28  8:38   ` [PATCH 1/4] btrfs-progs: get_fsid_fd() for getting fsid using fd Johannes Thumshirn
2020-08-03 20:29 [PATCH v2 0/3] btrfs: Enumerate and export exclusive operations Goldwyn Rodrigues
2020-08-03 20:29 ` [PATCH 2/3] btrfs: export currently executing exclusive operation via sysfs Goldwyn Rodrigues
2020-08-05  9:04   ` Nikolay Borisov

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