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From: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
To: <linux-btrfs@vger.kernel.org>
Subject: [PATCH 01/11] btrfs-progs: ioctl/libbtrfsutil: Add 3 definitions of new unprivileged ioctl
Date: Fri, 11 May 2018 16:29:39 +0900	[thread overview]
Message-ID: <20180511072949.15269-2-misono.tomohiro@jp.fujitsu.com> (raw)
In-Reply-To: <20180511072949.15269-1-misono.tomohiro@jp.fujitsu.com>

Add 3 definitions of new unprivileged ioctl (BTRFS_IOC_GET_SUBVOL_INFO,
BTRFS_IOC_GET_SUBVOL_ROOTREF and BTRFS_IOC_INO_LOOKUP_USER). They will
be used to implement the user version of "btrfs subvolume list" etc.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
---
 ioctl.h              | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 libbtrfsutil/btrfs.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 170 insertions(+)

diff --git a/ioctl.h b/ioctl.h
index 709e996f..c6624352 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -320,6 +320,22 @@ struct btrfs_ioctl_ino_lookup_args {
 };
 BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096);
 
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4080-BTRFS_VOL_NAME_MAX-1)
+struct btrfs_ioctl_ino_lookup_user_args {
+	/* in, inode number containing the subvolume of 'subvolid' */
+	__u64 dirid;
+	/* in */
+	__u64 subvolid;
+	/* out, name of the subvolume of 'subvolid' */
+	char name[BTRFS_VOL_NAME_MAX + 1];
+	/*
+	 * out, constructed path from the directory with which
+	 * the ioctl is called to dirid
+	 */
+	char path[BTRFS_INO_LOOKUP_USER_PATH_MAX];
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_user_args) == 4096);
+
 struct btrfs_ioctl_search_key {
 	/* which root are we searching.  0 is the tree of tree roots */
 	__u64 tree_id;
@@ -672,6 +688,70 @@ BUILD_ASSERT(sizeof(struct btrfs_ioctl_send_args_64) == 72);
 
 #define BTRFS_IOC_SEND_64_COMPAT_DEFINED 1
 
+struct btrfs_ioctl_get_subvol_info_args {
+	/* All filed is out */
+	/* Id of this subvolume */
+	__u64 id;
+	/* Name of this subvolume, used to get the real name at mount point */
+	char name[BTRFS_VOL_NAME_MAX + 1];
+	/*
+	 * Id of the subvolume which contains this subvolume.
+	 * Zero for top-level subvolume or deleted subvolume
+	 */
+	__u64 parent_id;
+	/*
+	 * Inode number of the directory which contains this subvolume.
+	 * Zero for top-level subvolume or deleted subvolume
+	 */
+	__u64 dirid;
+
+	/* Latest transaction id of this subvolume */
+	__u64 generation;
+	/* Flags of this subvolume */
+	__u64 flags;
+
+	/* uuid of this subvolume */
+	__u8 uuid[BTRFS_UUID_SIZE];
+	/*
+	 * uuid of the subvolume of which this subvolume is a snapshot.
+	 * All zero for non-snapshot subvolume
+	 */
+	__u8 parent_uuid[BTRFS_UUID_SIZE];
+	/*
+	 * uuid of the subvolume from which this subvolume is received.
+	 * All zero for non-received subvolume
+	 */
+	__u8 received_uuid[BTRFS_UUID_SIZE];
+
+	/* Transaction id indicates when change/create/send/receive happens */
+	__u64 ctransid;
+	__u64 otransid;
+	__u64 stransid;
+	__u64 rtransid;
+	/* Time corresponds to c/o/s/rtransid */
+	struct btrfs_ioctl_timespec ctime;
+	struct btrfs_ioctl_timespec otime;
+	struct btrfs_ioctl_timespec stime;
+	struct btrfs_ioctl_timespec rtime;
+
+	__u64 reserved[8];
+};
+
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+struct btrfs_ioctl_get_subvol_rootref_args {
+		/* in/out, min id of rootref's subvolid to be searched */
+		__u64 min_id;
+		/* out */
+		struct {
+			__u64 subvolid;
+			__u64 dirid;
+		} rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+		/* out, number of found items */
+		__u8 num_items;
+		__u8 align[7];
+};
+BUILD_ASSERT(sizeof(struct btrfs_ioctl_get_subvol_rootref_args) == 4096);
+
 /* Error codes as returned by the kernel */
 enum btrfs_err_code {
 	notused,
@@ -828,6 +908,12 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
                                   struct btrfs_ioctl_feature_flags[3])
 #define BTRFS_IOC_RM_DEV_V2	_IOW(BTRFS_IOCTL_MAGIC, 58, \
 				   struct btrfs_ioctl_vol_args_v2)
+#define BTRFS_IOC_GET_SUBVOL_INFO _IOR(BTRFS_IOCTL_MAGIC, 60, \
+				struct btrfs_ioctl_get_subvol_info_args)
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF _IOWR(BTRFS_IOCTL_MAGIC, 61, \
+				struct btrfs_ioctl_get_subvol_rootref_args)
+#define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 62, \
+				struct btrfs_ioctl_ino_lookup_user_args)
 #ifdef __cplusplus
 }
 #endif
diff --git a/libbtrfsutil/btrfs.h b/libbtrfsutil/btrfs.h
index c293f6bf..451e227c 100644
--- a/libbtrfsutil/btrfs.h
+++ b/libbtrfsutil/btrfs.h
@@ -421,6 +421,21 @@ struct btrfs_ioctl_ino_lookup_args {
 	char name[BTRFS_INO_LOOKUP_PATH_MAX];
 };
 
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4080-BTRFS_VOL_NAME_MAX-1)
+struct btrfs_ioctl_ino_lookup_user_args {
+	/* in, inode number containing the subvolume of 'subvolid' */
+	__u64 dirid;
+	/* in */
+	__u64 subvolid;
+	/* out, name of the subvolume of 'subvolid' */
+	char name[BTRFS_VOL_NAME_MAX + 1];
+	/*
+	 * out, constructed path from the directory with which
+	 * the ioctl is called to dirid
+	 */
+	char path[BTRFS_INO_LOOKUP_USER_PATH_MAX];
+};
+
 /* Search criteria for the btrfs SEARCH ioctl family. */
 struct btrfs_ioctl_search_key {
 	/*
@@ -720,6 +735,69 @@ struct btrfs_ioctl_send_args {
 	__u64 reserved[4];		/* in */
 };
 
+struct btrfs_ioctl_get_subvol_info_args {
+	/* All filed is out */
+	/* Id of this subvolume */
+	__u64 id;
+	/* Name of this subvolume, used to get the real name at mount point */
+	char name[BTRFS_VOL_NAME_MAX + 1];
+	/*
+	 * Id of the subvolume which contains this subvolume.
+	 * Zero for top-level subvolume or deleted subvolume
+	 */
+	__u64 parent_id;
+	/*
+	 * Inode number of the directory which contains this subvolume.
+	 * Zero for top-level subvolume or deleted subvolume
+	 */
+	__u64 dirid;
+
+	/* Latest transaction id of this subvolume */
+	__u64 generation;
+	/* Flags of this subvolume */
+	__u64 flags;
+
+	/* uuid of this subvolume */
+	__u8 uuid[BTRFS_UUID_SIZE];
+	/*
+	 * uuid of the subvolume of which this subvolume is a snapshot.
+	 * All zero for non-snapshot subvolume
+	 */
+	__u8 parent_uuid[BTRFS_UUID_SIZE];
+	/*
+	 * uuid of the subvolume from which this subvolume is received.
+	 * All zero for non-received subvolume
+	 */
+	__u8 received_uuid[BTRFS_UUID_SIZE];
+
+	/* Transaction id indicates when change/create/send/receive happens */
+	__u64 ctransid;
+	__u64 otransid;
+	__u64 stransid;
+	__u64 rtransid;
+	/* Time corresponds to c/o/s/rtransid */
+	struct btrfs_ioctl_timespec ctime;
+	struct btrfs_ioctl_timespec otime;
+	struct btrfs_ioctl_timespec stime;
+	struct btrfs_ioctl_timespec rtime;
+
+	__u64 reserved[8];
+};
+
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+struct btrfs_ioctl_get_subvol_rootref_args {
+		/* in/out, min id of rootref's subvolid to be searched */
+		__u64 min_id;
+		/* out */
+		struct {
+			__u64 subvolid;
+			__u64 dirid;
+		} rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+		/* out, number of found items */
+		__u8 num_items;
+		__u8 align[7];
+};
+
 /* Error codes as returned by the kernel */
 enum btrfs_err_code {
 	BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET = 1,
@@ -836,5 +914,11 @@ enum btrfs_err_code {
 				   struct btrfs_ioctl_feature_flags[3])
 #define BTRFS_IOC_RM_DEV_V2 _IOW(BTRFS_IOCTL_MAGIC, 58, \
 				   struct btrfs_ioctl_vol_args_v2)
+#define BTRFS_IOC_GET_SUBVOL_INFO _IOR(BTRFS_IOCTL_MAGIC, 60, \
+				struct btrfs_ioctl_get_subvol_info_args)
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF _IOWR(BTRFS_IOCTL_MAGIC, 61, \
+				struct btrfs_ioctl_get_subvol_rootref_args)
+#define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 62, \
+				struct btrfs_ioctl_ino_lookup_user_args)
 
 #endif /* _LINUX_BTRFS_H */
-- 
2.14.3



  reply	other threads:[~2018-05-11  7:27 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11  7:29 [PATCH 00/11] btrfs-progs: Rework of "subvolume list/show" and relax the root privileges of them Tomohiro Misono
2018-05-11  7:29 ` Tomohiro Misono [this message]
2018-05-11  7:29 ` [PATCH 02/11] btrfs-progs: libbtrfsutil: Factor out btrfs_util_subvolume_info_fd() Tomohiro Misono
2018-05-11  7:29 ` [PATCH 03/11] btrfs-porgs: libbtrfsutil: Relax the privileges of util_subvolume_info() Tomohiro Misono
2018-05-11  7:29 ` [PATCH 04/11] btrfs-progs: libbtrfsuitl: Factor out btrfs_util_subvolume_iterator_next() Tomohiro Misono
2018-05-11  7:29 ` [PATCH 05/11] btrfs-progs: libbtrfsutil: Update the behavior of subvolume iterator and relax the privileges Tomohiro Misono
2018-05-11  7:29 ` [PATCH 06/11] btrfs-progs: sub list: Use libbtrfsuitl for subvolume list Tomohiro Misono
2018-05-11  7:29 ` [PATCH 07/11] btrfs-progs: sub list: Change the default behavior of "subvolume list" and allow non-privileged user to call it Tomohiro Misono
2018-05-11  7:29 ` [PATCH 08/11] btrfs-progs: utils: Fallback to open without O_NOATIME flag in find_mount_root(): Tomohiro Misono
2018-05-11  7:29 ` [PATCH 09/11] btrfs-progs: sub show: Allow non-privileged user to call "subvolume show" Tomohiro Misono
2018-05-11  7:29 ` [PATCH 10/11] btrfs-progs: test: Add helper function to check if test user exists Tomohiro Misono
2018-05-11  7:29 ` [PATCH 11/11] btrfs-porgs: test: Add cli-test/009 to check subvolume list for both root and normal user Tomohiro Misono

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