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linux-user: Add support for two btrfs ioctls used for subvolume
This patch implements functionality for following ioctl: BTRFS_IOC_DEFAULT_SUBVOL - Setting a default subvolume Set a default subvolume for a btrfs filesystem. The third ioctl's argument is a '__u64' (unsigned long long) which represents the id of a subvolume that is to be set as the default. BTRFS_IOC_GET_SUBVOL_ROOTREF - Getting tree and directory id of subvolumes Read tree and directory id of subvolumes from a btrfs filesystem. The tree and directory id's are returned in the ioctl's third argument which represents a pointer to a following type: struct btrfs_ioctl_get_subvol_rootref_args { /* in/out, minimum id of rootref's treeid to be searched */ __u64 min_treeid; /* out */ struct { __u64 treeid; __u64 dirid; } rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM]; /* out, number of found items */ __u8 num_items; __u8 align[7]; }; Before calling this ioctl, 'min_treeid' field should be filled with value that represent the minimum value for the tree id. Implementation notes: Ioctl BTRFS_IOC_GET_SUBVOL_ROOTREF uses the above mentioned structure type as third argument. That is the reason why a aproppriate thunk structure definition is added in file 'syscall_types.h'. Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com> Tested-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20200823195014.116226-7-Filip.Bozuta@syrmia.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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0ff496a05f
commit
784c08c8c4
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@ -206,6 +206,9 @@
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IOCTL(BTRFS_IOC_INO_LOOKUP, IOC_RW,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_args)))
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#endif
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#ifdef BTRFS_IOC_DEFAULT_SUBVOL
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IOCTL(BTRFS_IOC_DEFAULT_SUBVOL, IOC_W, MK_PTR(TYPE_ULONGLONG))
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#endif
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#ifdef BTRFS_IOC_SUBVOL_GETFLAGS
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IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG))
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#endif
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@ -248,6 +251,10 @@
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IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args)))
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#endif
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#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF
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IOCTL(BTRFS_IOC_GET_SUBVOL_ROOTREF, IOC_RW,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_rootref_args)))
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#endif
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#ifdef BTRFS_IOC_INO_LOOKUP_USER
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IOCTL(BTRFS_IOC_INO_LOOKUP_USER, IOC_RW,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_user_args)))
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@ -1014,6 +1014,8 @@ struct target_rtc_pll_info {
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#define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14)
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#define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOWU(BTRFS_IOCTL_MAGIC, 15)
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#define TARGET_BTRFS_IOC_INO_LOOKUP TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 18)
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#define TARGET_BTRFS_IOC_DEFAULT_SUBVOL TARGET_IOW(BTRFS_IOCTL_MAGIC, 19,\
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abi_ullong)
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#define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\
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abi_ullong)
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#define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\
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@ -1027,6 +1029,7 @@ struct target_rtc_pll_info {
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#define TARGET_BTRFS_IOC_GET_SUPPORTED_FEATURES TARGET_IORU(BTRFS_IOCTL_MAGIC, 57)
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#define TARGET_BTRFS_IOC_LOGICAL_INO_V2 TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 59)
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#define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IORU(BTRFS_IOCTL_MAGIC, 60)
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#define TARGET_BTRFS_IOC_GET_SUBVOL_ROOTREF TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 61)
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#define TARGET_BTRFS_IOC_INO_LOOKUP_USER TARGET_IOWRU(BTRFS_IOCTL_MAGIC, 62)
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/* usb ioctls */
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@ -435,6 +435,19 @@ STRUCT(btrfs_ioctl_dev_info_args,
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MK_ARRAY(TYPE_CHAR, BTRFS_DEVICE_PATH_NAME_MAX)) /* path */
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#endif
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#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF
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STRUCT(rootref,
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TYPE_ULONGLONG, /* treeid */
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TYPE_ULONGLONG) /* dirid */
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STRUCT(btrfs_ioctl_get_subvol_rootref_args,
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TYPE_ULONGLONG, /* min_treeid */
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MK_ARRAY(MK_STRUCT(STRUCT_rootref),
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BTRFS_MAX_ROOTREF_BUFFER_NUM), /* rootref */
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TYPE_CHAR, /* num_items */
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MK_ARRAY(TYPE_CHAR, 7)) /* align */
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#endif
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#ifdef BTRFS_IOC_GET_DEV_STATS
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STRUCT(btrfs_ioctl_get_dev_stats,
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TYPE_ULONGLONG, /* devid */
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