| Message ID | 20200717144435.268166-3-Filip.Bozuta@syrmia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for a group of btrfs ioctls - 2 | expand |
Le 17/07/2020 à 16:44, Filip Bozuta a écrit : > 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> > --- > linux-user/ioctls.h | 7 +++++++ > linux-user/syscall_defs.h | 4 ++++ > linux-user/syscall_types.h | 11 +++++++++++ > 3 files changed, 22 insertions(+) > > diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h > index a7f5664487..2c553103e6 100644 > --- a/linux-user/ioctls.h > +++ b/linux-user/ioctls.h > @@ -206,6 +206,9 @@ > IOCTL(BTRFS_IOC_INO_LOOKUP, IOC_RW, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_args))) > #endif > +#ifdef BTRFS_IOC_DEFAULT_SUBVOL > + IOCTL(BTRFS_IOC_DEFAULT_SUBVOL, IOC_W, MK_PTR(TYPE_ULONGLONG)) > +#endif > #ifdef BTRFS_IOC_SUBVOL_GETFLAGS > IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG)) > #endif > @@ -248,6 +251,10 @@ > IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R, > MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args))) > #endif > +#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF > + IOCTL(BTRFS_IOC_GET_SUBVOL_ROOTREF, IOC_RW, > + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_rootref_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))) > diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h > index 7bb105428b..f4b4fc4a20 100644 > --- a/linux-user/syscall_defs.h > +++ b/linux-user/syscall_defs.h > @@ -984,6 +984,8 @@ struct target_rtc_pll_info { > 15, struct btrfs_ioctl_vol_args) > #define TARGET_BTRFS_IOC_INO_LOOKUP TARGET_IOWR(BTRFS_IOCTL_MAGIC,\ > 18, struct btrfs_ioctl_ino_lookup_args) > +#define TARGET_BTRFS_IOC_DEFAULT_SUBVOL TARGET_IOW(BTRFS_IOCTL_MAGIC, \ > + 19, abi_ullong) > #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, \ > @@ -1006,6 +1008,8 @@ struct target_rtc_pll_info { > 59, struct btrfs_ioctl_logical_ino_args) > #define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IOR(BTRFS_IOCTL_MAGIC, \ > 60, struct btrfs_ioctl_get_subvol_info_args) > +#define TARGET_BTRFS_IOC_GET_SUBVOL_ROOTREF TARGET_IOWR(BTRFS_IOCTL_MAGIC,\ > + 61, struct btrfs_ioctl_get_subvol_rootref_args) This one needs TARGET_IOWRU(), the first one can be kept as it uses abi_ullong. with that changed: Reviewed-by: Laurent Vivier <laurent@vivier.eu> Thanks, Laurent
diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h index a7f5664487..2c553103e6 100644 --- a/linux-user/ioctls.h +++ b/linux-user/ioctls.h @@ -206,6 +206,9 @@ IOCTL(BTRFS_IOC_INO_LOOKUP, IOC_RW, MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_ino_lookup_args))) #endif +#ifdef BTRFS_IOC_DEFAULT_SUBVOL + IOCTL(BTRFS_IOC_DEFAULT_SUBVOL, IOC_W, MK_PTR(TYPE_ULONGLONG)) +#endif #ifdef BTRFS_IOC_SUBVOL_GETFLAGS IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG)) #endif @@ -248,6 +251,10 @@ IOCTL(BTRFS_IOC_GET_SUBVOL_INFO, IOC_R, MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_info_args))) #endif +#ifdef BTRFS_IOC_GET_SUBVOL_ROOTREF + IOCTL(BTRFS_IOC_GET_SUBVOL_ROOTREF, IOC_RW, + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_get_subvol_rootref_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))) diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h index 7bb105428b..f4b4fc4a20 100644 --- a/linux-user/syscall_defs.h +++ b/linux-user/syscall_defs.h @@ -984,6 +984,8 @@ struct target_rtc_pll_info { 15, struct btrfs_ioctl_vol_args) #define TARGET_BTRFS_IOC_INO_LOOKUP TARGET_IOWR(BTRFS_IOCTL_MAGIC,\ 18, struct btrfs_ioctl_ino_lookup_args) +#define TARGET_BTRFS_IOC_DEFAULT_SUBVOL TARGET_IOW(BTRFS_IOCTL_MAGIC, \ + 19, abi_ullong) #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, \ @@ -1006,6 +1008,8 @@ struct target_rtc_pll_info { 59, struct btrfs_ioctl_logical_ino_args) #define TARGET_BTRFS_IOC_GET_SUBVOL_INFO TARGET_IOR(BTRFS_IOCTL_MAGIC, \ 60, struct btrfs_ioctl_get_subvol_info_args) +#define TARGET_BTRFS_IOC_GET_SUBVOL_ROOTREF TARGET_IOWR(BTRFS_IOCTL_MAGIC,\ + 61, struct btrfs_ioctl_get_subvol_rootref_args) #define TARGET_BTRFS_IOC_INO_LOOKUP_USER TARGET_IOWR(BTRFS_IOCTL_MAGIC,\ 62, struct btrfs_ioctl_ino_lookup_user_args) diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h index 980c29000a..d2f1b30ff3 100644 --- a/linux-user/syscall_types.h +++ b/linux-user/syscall_types.h @@ -381,6 +381,17 @@ STRUCT(btrfs_ioctl_dev_info_args, MK_ARRAY(TYPE_ULONGLONG, 379), /* unused */ MK_ARRAY(TYPE_CHAR, BTRFS_DEVICE_PATH_NAME_MAX)) /* path */ +STRUCT(rootref, + TYPE_ULONGLONG, /* treeid */ + TYPE_ULONGLONG) /* dirid */ + +STRUCT(btrfs_ioctl_get_subvol_rootref_args, + TYPE_ULONGLONG, /* min_treeid */ + MK_ARRAY(MK_STRUCT(STRUCT_rootref), + BTRFS_MAX_ROOTREF_BUFFER_NUM), /* rootref */ + TYPE_CHAR, /* num_items */ + MK_ARRAY(TYPE_CHAR, 7)) /* align */ + STRUCT(btrfs_ioctl_get_dev_stats, TYPE_ULONGLONG, /* devid */ TYPE_ULONGLONG, /* nr_items */
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> --- linux-user/ioctls.h | 7 +++++++ linux-user/syscall_defs.h | 4 ++++ linux-user/syscall_types.h | 11 +++++++++++ 3 files changed, 22 insertions(+)