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spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:39914 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k2bEC-00044O-7t for qemu-devel@archiver.kernel.org; Mon, 03 Aug 2020 10:14:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:32834) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k2bCW-0001ub-AG for qemu-devel@nongnu.org; Mon, 03 Aug 2020 10:12:28 -0400 Received: from mout.kundenserver.de ([217.72.192.73]:49645) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k2bCS-0002EK-Ji for qemu-devel@nongnu.org; Mon, 03 Aug 2020 10:12:27 -0400 Received: from [192.168.100.1] ([78.238.229.36]) by mrelayeu.kundenserver.de (mreue106 [213.165.67.119]) with ESMTPSA (Nemesis) id 1MYvHa-1kFssN2PGy-00Utsx; Mon, 03 Aug 2020 16:12:11 +0200 Subject: Re: [PATCH v2 5/8] linux-user: Add support for a group of btrfs inode ioctls To: Filip Bozuta , qemu-devel@nongnu.org References: <20200803094629.21898-1-Filip.Bozuta@syrmia.com> <20200803094629.21898-6-Filip.Bozuta@syrmia.com> From: Laurent Vivier Autocrypt: addr=laurent@vivier.eu; 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envelope-from=laurent@vivier.eu; helo=mout.kundenserver.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/03 10:12:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Riku Voipio Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Le 03/08/2020 à 11:46, Filip Bozuta a écrit : > This patch implements functionality of following ioctls: > > BTRFS_IOC_INO_LOOKUP - Reading tree root id and path > > Read tree root id and path for a given file or directory. > The name and tree root id are returned in an ioctl's third > argument that represents a pointer to a following type: > > struct btrfs_ioctl_ino_lookup_args { > __u64 treeid; > __u64 objectid; > char name[BTRFS_INO_LOOKUP_PATH_MAX]; > }; > > Before calling this ioctl, field 'objectid' should be filled > with the object id value for which the tree id and path are > to be read. Value 'BTRFS_FIRST_FREE_OBJECTID' represents the > object id for the first available btrfs object (directory or > file). > > BTRFS_IOC_INO_PATHS - Reading paths to all files > > Read path to all files with a certain inode number. The paths > are returned in the ioctl's third argument which represents > a pointer to a following type: > > struct btrfs_ioctl_ino_path_args { > __u64 inum; /* in */ > __u64 size; /* in */ > __u64 reserved[4]; > /* struct btrfs_data_container *fspath; out */ > __u64 fspath; /* out */ > }; > > Before calling this ioctl, the 'inum' and 'size' field should > be filled with the aproppriate inode number and size of the > directory where file paths should be looked for. For now, the > paths are returned in an '__u64' (unsigned long long) value > 'fspath'. > > BTRFS_IOC_LOGICAL_INO - Reading inode numbers > > Read inode numbers for files on a certain logical adress. The > inode numbers are returned in the ioctl's third argument which > represents a pointer to a following type: > > struct btrfs_ioctl_logical_ino_args { > __u64 logical; /* in */ > __u64 size; /* in */ > __u64 reserved[3]; /* must be 0 for now */ > __u64 flags; /* in, v2 only */ > /* struct btrfs_data_container *inodes; out */ > __u64 inodes; > }; > > Before calling this ioctl, the 'logical' and 'size' field should > be filled with the aproppriate logical adress and size of where > the inode numbers of files should be looked for. For now, the > inode numbers are returned in an '__u64' (unsigned long long) > value 'inodes'. > > BTRFS_IOC_LOGICAL_INO_V2 - Reading inode numbers > > Same as the above mentioned ioctl except that it allows passing > a flags 'BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET'. > > BTRFS_IOC_INO_LOOKUP_USER - Reading subvolume name and path > > Read name and path of a subvolume. The tree root id and > path are read in an ioctl's third argument which represents a > pointer to a following type: > > struct btrfs_ioctl_ino_lookup_user_args { > /* in, inode number containing the subvolume of 'subvolid' */ > __u64 dirid; > /* in */ > __u64 treeid; > /* out, name of the subvolume of 'treeid' */ > 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]; > }; > > Before calling this ioctl, the 'dirid' and 'treeid' field should > be filled with aproppriate values which represent the inode number > of the directory that contains the subvolume and treeid of the > subvolume. > > Implementation notes: > > All of the ioctls in this patch use structure types as third arguments. > That is the reason why aproppriate thunk definitions were added in file > 'syscall_types.h'. > > Signed-off-by: Filip Bozuta > --- > linux-user/ioctls.h | 20 ++++++++++++++++++++ > linux-user/syscall_defs.h | 5 +++++ > linux-user/syscall_types.h | 24 ++++++++++++++++++++++++ > 3 files changed, 49 insertions(+) > > diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h > index c6303a0406..a7f5664487 100644 > --- a/linux-user/ioctls.h > +++ b/linux-user/ioctls.h > @@ -202,6 +202,10 @@ > IOCTL(BTRFS_IOC_SNAP_DESTROY, IOC_W, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args))) > #endif > +#ifdef BTRFS_IOC_INO_LOOKUP > + IOCTL(BTRFS_IOC_INO_LOOKUP, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_args))) > +#endif > #ifdef BTRFS_IOC_SUBVOL_GETFLAGS > IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG)) > #endif > @@ -212,6 +216,14 @@ > IOCTL(BTRFS_IOC_DEV_INFO, IOC_RW, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_dev_info_args))) > #endif > +#ifdef BTRFS_IOC_INO_PATHS > + IOCTL(BTRFS_IOC_INO_PATHS, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_path_args))) > +#endif > +#ifdef BTRFS_IOC_LOGICAL_INO > + IOCTL(BTRFS_IOC_LOGICAL_INO, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_logical_ino_args))) > +#endif > #ifdef BTRFS_IOC_GET_DEV_STATS > IOCTL(BTRFS_IOC_GET_DEV_STATS, IOC_RW, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_dev_stats))) > @@ -228,10 +240,18 @@ > IOCTL(BTRFS_IOC_GET_SUPPORTED_FEATURES, IOC_R, > MK_PTR(MK_ARRAY(MK_STRUCT(STRUCT_btrfs_ioctl_feature_flags), 3))) > #endif > +#ifdef BTRFS_IOC_LOGICAL_INO_V2 > + IOCTL(BTRFS_IOC_LOGICAL_INO_V2, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_logical_ino_args))) > +#endif > #ifdef BTRFS_IOC_GET_SUBVOL_INFO > IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args))) > #endif > +#ifdef BTRFS_IOC_INO_LOOKUP_USER > + IOCTL(BTRFS_IOC_INO_LOOKUP_USER, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_user_args))) > +#endif > > #ifdef CONFIG_USBFS > /* USB ioctls */ > diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h > index 13a444356b..538b884b8f 100644 > --- a/linux-user/syscall_defs.h > +++ b/linux-user/syscall_defs.h > @@ -975,16 +975,21 @@ struct target_rtc_pll_info { > #define TARGET_BTRFS_IOC_RM_DEV TARGET_IOWU(BTRFS_IOCTL_MAGIC, 11) > #define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14) > #define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOWU(BTRFS_IOCTL_MAGIC, 15) > +#define TARGET_BTRFS_IOC_INO_LOOKUP TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 18) > #define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\ > abi_ullong) > #define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\ > abi_ullong) > #define TARGET_BTRFS_IOC_DEV_INFO TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 30) > +#define TARGET_BTRFS_IOC_INO_PATHS TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 35) > +#define TARGET_BTRFS_IOC_LOGICAL_INO TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 36) > #define TARGET_BTRFS_IOC_GET_DEV_STATS TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 52) > #define TARGET_BTRFS_IOC_GET_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57) > #define TARGET_BTRFS_IOC_SET_FEATURES TARGET_IOWU(BTRFS_IOCTL_MAGIC, 57) > #define TARGET_BTRFS_IOC_GET_SUPPORTED_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57) > +#define TARGET_BTRFS_IOC_LOGICAL_INO_V2 TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 59) > #define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IORU(BTRFS_IOCTL_MAGIC, 60) > +#define TARGET_BTRFS_IOC_INO_LOOKUP_USER TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 62) > > /* usb ioctls */ > #define TARGET_USBDEVFS_CONTROL TARGET_IOWRU('U', 0) > diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h > index e26ab01e8f..978f2d682c 100644 > --- a/linux-user/syscall_types.h > +++ b/linux-user/syscall_types.h > @@ -349,6 +349,30 @@ STRUCT(btrfs_ioctl_get_subvol_info_args, > MK_STRUCT(STRUCT_btrfs_ioctl_timespec), /* rtime */ > MK_ARRAY(TYPE_ULONGLONG, 8)) /* reserved */ > > +STRUCT(btrfs_ioctl_ino_lookup_args, > + TYPE_ULONGLONG, /* treeid */ > + TYPE_ULONGLONG, /* objectid */ > + MK_ARRAY(TYPE_CHAR, BTRFS_INO_LOOKUP_PATH_MAX)) /* name */ > + > +STRUCT(btrfs_ioctl_ino_path_args, > + TYPE_ULONGLONG, /* inum */ > + TYPE_ULONGLONG, /* size */ > + MK_ARRAY(TYPE_ULONGLONG, 4), /* reserved */ > + TYPE_ULONGLONG) /* fspath */ > + > +STRUCT(btrfs_ioctl_logical_ino_args, > + TYPE_ULONGLONG, /* logical */ > + TYPE_ULONGLONG, /* size */ > + MK_ARRAY(TYPE_ULONGLONG, 3), /* reserved */ > + TYPE_ULONGLONG, /* flags */ > + TYPE_ULONGLONG) /* inodes */ > + > +STRUCT(btrfs_ioctl_ino_lookup_user_args, > + TYPE_ULONGLONG, /* dirid */ > + TYPE_ULONGLONG, /* treeid */ > + MK_ARRAY(TYPE_CHAR, BTRFS_VOL_NAME_MAX + 1), /* name */ > + MK_ARRAY(TYPE_CHAR, BTRFS_INO_LOOKUP_USER_PATH_MAX)) /* path */ > + > STRUCT(btrfs_ioctl_dev_info_args, > TYPE_ULONGLONG, /* devid */ > MK_ARRAY(TYPE_CHAR, BTRFS_UUID_SIZE), /* uuid */ > Reviewed-by: Laurent Vivier