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Message-Id: <20180508221800.2642-3-kent.overstreet@gmail.com>
Date: Tue, 8 May 2018 18:18:00 -0400
From: Kent Overstreet <kent.overstreet@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-bcache@...r.kernel.org
Cc: Kent Overstreet <kent.overstreet@...il.com>,
Dave Chinner <dchinner@...hat.com>,
"Darrick J . Wong" <darrick.wong@...cle.com>, hare@...e.com
Subject: [PATCH 2/2] bcachefs: Ioctl interface
Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
fs/bcachefs/bcachefs_ioctl.h | 182 +++++++++++++++++++++++++++++++++++
1 file changed, 182 insertions(+)
create mode 100644 fs/bcachefs/bcachefs_ioctl.h
diff --git a/fs/bcachefs/bcachefs_ioctl.h b/fs/bcachefs/bcachefs_ioctl.h
new file mode 100644
index 0000000000..4442a02b5c
--- /dev/null
+++ b/fs/bcachefs/bcachefs_ioctl.h
@@ -0,0 +1,182 @@
+#ifndef _BCACHEFS_IOCTL_H
+#define _BCACHEFS_IOCTL_H
+
+#include <linux/uuid.h>
+#include <asm/ioctl.h>
+#include "bcachefs_format.h"
+
+/*
+ * Flags common to multiple ioctls:
+ */
+#define BCH_FORCE_IF_DATA_LOST (1 << 0)
+#define BCH_FORCE_IF_METADATA_LOST (1 << 1)
+#define BCH_FORCE_IF_DATA_DEGRADED (1 << 2)
+#define BCH_FORCE_IF_METADATA_DEGRADED (1 << 3)
+
+#define BCH_FORCE_IF_DEGRADED \
+ (BCH_FORCE_IF_DATA_DEGRADED| \
+ BCH_FORCE_IF_METADATA_DEGRADED)
+
+/*
+ * If cleared, ioctl that refer to a device pass it as a pointer to a pathname
+ * (e.g. /dev/sda1); if set, the dev field is the device's index within the
+ * filesystem:
+ */
+#define BCH_BY_INDEX (1 << 4)
+
+/*
+ * For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
+ * wide superblock:
+ */
+#define BCH_READ_DEV (1 << 5)
+
+/* global control dev: */
+
+/* These are currently broken, and probably unnecessary: */
+#if 0
+#define BCH_IOCTL_ASSEMBLE _IOW(0xbc, 1, struct bch_ioctl_assemble)
+#define BCH_IOCTL_INCREMENTAL _IOW(0xbc, 2, struct bch_ioctl_incremental)
+
+struct bch_ioctl_assemble {
+ __u32 flags;
+ __u32 nr_devs;
+ __u64 pad;
+ __u64 devs[];
+};
+
+struct bch_ioctl_incremental {
+ __u32 flags;
+ __u64 pad;
+ __u64 dev;
+};
+#endif
+
+/* filesystem ioctls: */
+
+#define BCH_IOCTL_QUERY_UUID _IOR(0xbc, 1, struct bch_ioctl_query_uuid)
+#define BCH_IOCTL_START _IOW(0xbc, 2, struct bch_ioctl_start)
+#define BCH_IOCTL_STOP _IO(0xbc, 3)
+#define BCH_IOCTL_DISK_ADD _IOW(0xbc, 4, struct bch_ioctl_disk)
+#define BCH_IOCTL_DISK_REMOVE _IOW(0xbc, 5, struct bch_ioctl_disk)
+#define BCH_IOCTL_DISK_ONLINE _IOW(0xbc, 6, struct bch_ioctl_disk)
+#define BCH_IOCTL_DISK_OFFLINE _IOW(0xbc, 7, struct bch_ioctl_disk)
+#define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc, 8, struct bch_ioctl_disk_set_state)
+#define BCH_IOCTL_DATA _IOW(0xbc, 10, struct bch_ioctl_data)
+#define BCH_IOCTL_USAGE _IOWR(0xbc, 11, struct bch_ioctl_usage)
+#define BCH_IOCTL_READ_SUPER _IOW(0xbc, 12, struct bch_ioctl_read_super)
+#define BCH_IOCTL_DISK_GET_IDX _IOW(0xbc, 13, struct bch_ioctl_disk_get_idx)
+#define BCH_IOCTL_DISK_RESIZE _IOW(0xbc, 13, struct bch_ioctl_disk_resize)
+
+struct bch_ioctl_query_uuid {
+ uuid_le uuid;
+};
+
+struct bch_ioctl_start {
+ __u32 flags;
+ __u32 pad;
+};
+
+struct bch_ioctl_disk {
+ __u32 flags;
+ __u32 pad;
+ __u64 dev;
+};
+
+struct bch_ioctl_disk_set_state {
+ __u32 flags;
+ __u8 new_state;
+ __u8 pad[3];
+ __u64 dev;
+};
+
+/*
+ * BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
+ * scrub, rereplicate, migrate).
+ *
+ * This ioctl kicks off a job in the background, and returns a file descriptor.
+ * Reading from the file descriptor returns a struct bch_ioctl_data_progress,
+ * indicating current progress, and closing the file descriptor will stop the
+ * job. The file descriptor is O_CLOEXEC.
+ */
+
+enum bch_data_ops {
+ BCH_DATA_OP_SCRUB = 0,
+ BCH_DATA_OP_REREPLICATE = 1,
+ BCH_DATA_OP_MIGRATE = 2,
+ BCH_DATA_OP_NR = 3,
+};
+
+struct bch_ioctl_data {
+ __u32 op;
+ __u32 flags;
+
+ struct bpos start;
+ struct bpos end;
+
+ union {
+ struct {
+ __u32 dev;
+ __u32 pad;
+ } migrate;
+ };
+} __attribute__((packed, aligned(8)));
+
+struct bch_ioctl_data_progress {
+ __u8 data_type;
+ __u8 btree_id;
+ __u8 pad[2];
+ struct bpos pos;
+
+ __u64 sectors_done;
+ __u64 sectors_total;
+} __attribute__((packed, aligned(8)));
+
+struct bch_ioctl_dev_usage {
+ __u8 state;
+ __u8 alive;
+ __u8 pad[6];
+ __u32 dev;
+
+ __u32 bucket_size;
+ __u64 nr_buckets;
+
+ __u64 buckets[BCH_DATA_NR];
+ __u64 sectors[BCH_DATA_NR];
+};
+
+struct bch_ioctl_fs_usage {
+ __u64 capacity;
+ __u64 used;
+ __u64 online_reserved;
+ __u64 persistent_reserved[BCH_REPLICAS_MAX];
+ __u64 sectors[BCH_DATA_NR][BCH_REPLICAS_MAX];
+};
+
+struct bch_ioctl_usage {
+ __u16 nr_devices;
+ __u16 pad[3];
+
+ struct bch_ioctl_fs_usage fs;
+ struct bch_ioctl_dev_usage devs[0];
+};
+
+struct bch_ioctl_read_super {
+ __u32 flags;
+ __u32 pad;
+ __u64 dev;
+ __u64 size;
+ __u64 sb;
+};
+
+struct bch_ioctl_disk_get_idx {
+ __u64 dev;
+};
+
+struct bch_ioctl_disk_resize {
+ __u32 flags;
+ __u32 pad;
+ __u64 dev;
+ __u64 nbuckets;
+};
+
+#endif /* _BCACHEFS_IOCTL_H */
--
2.17.0
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