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ext4: implemet new ioctls to set and get superblock parameters

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Implement the EXT4_IOC_GET_TUNE_SB_PARAM and
EXT4_IOC_SET_TUNE_SB_PARAM ioctls, which allow certains superblock
parameters to be set while the file system is mounted, without needing
write access to the block device.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Message-ID: <20250916-tune2fs-v2-3-d594dc7486f0@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2025-09-16 23:22:49 -04:00
parent 12c84dd4d3
commit 04a91570ac
2 changed files with 358 additions and 7 deletions
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include/uapi/linux/ext4.h
+53
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@@ -33,6 +33,8 @@
#define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
#define EXT4_IOC_GETFSUUID _IOR('f', 44, struct fsuuid)
#define EXT4_IOC_SETFSUUID _IOW('f', 44, struct fsuuid)
#define EXT4_IOC_GET_TUNE_SB_PARAM _IOR('f', 45, struct ext4_tune_sb_params)
#define EXT4_IOC_SET_TUNE_SB_PARAM _IOW('f', 46, struct ext4_tune_sb_params)
#define EXT4_IOC_SHUTDOWN _IOR('X', 125, __u32)
@@ -108,6 +110,57 @@ struct ext4_new_group_input {
__u16 unused;
};
struct ext4_tune_sb_params {
__u32 set_flags;
__u32 checkinterval;
__u16 errors_behavior;
__u16 mnt_count;
__u16 max_mnt_count;
__u16 raid_stride;
__u64 last_check_time;
__u64 reserved_blocks;
__u64 blocks_count;
__u32 default_mnt_opts;
__u32 reserved_uid;
__u32 reserved_gid;
__u32 raid_stripe_width;
__u16 encoding;
__u16 encoding_flags;
__u8 def_hash_alg;
__u8 pad_1;
__u16 pad_2;
__u32 feature_compat;
__u32 feature_incompat;
__u32 feature_ro_compat;
__u32 set_feature_compat_mask;
__u32 set_feature_incompat_mask;
__u32 set_feature_ro_compat_mask;
__u32 clear_feature_compat_mask;
__u32 clear_feature_incompat_mask;
__u32 clear_feature_ro_compat_mask;
__u8 mount_opts[64];
__u8 pad[64];
};
#define EXT4_TUNE_FL_ERRORS_BEHAVIOR 0x00000001
#define EXT4_TUNE_FL_MNT_COUNT 0x00000002
#define EXT4_TUNE_FL_MAX_MNT_COUNT 0x00000004
#define EXT4_TUNE_FL_CHECKINTRVAL 0x00000008
#define EXT4_TUNE_FL_LAST_CHECK_TIME 0x00000010
#define EXT4_TUNE_FL_RESERVED_BLOCKS 0x00000020
#define EXT4_TUNE_FL_RESERVED_UID 0x00000040
#define EXT4_TUNE_FL_RESERVED_GID 0x00000080
#define EXT4_TUNE_FL_DEFAULT_MNT_OPTS 0x00000100
#define EXT4_TUNE_FL_DEF_HASH_ALG 0x00000200
#define EXT4_TUNE_FL_RAID_STRIDE 0x00000400
#define EXT4_TUNE_FL_RAID_STRIPE_WIDTH 0x00000800
#define EXT4_TUNE_FL_MOUNT_OPTS 0x00001000
#define EXT4_TUNE_FL_FEATURES 0x00002000
#define EXT4_TUNE_FL_EDIT_FEATURES 0x00004000
#define EXT4_TUNE_FL_FORCE_FSCK 0x00008000
#define EXT4_TUNE_FL_ENCODING 0x00010000
#define EXT4_TUNE_FL_ENCODING_FLAGS 0x00020000
/*
* Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
* It indicates that the entry in extent status cache is for a hole.