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Btrfs: add basic restriper infrastructure

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Add basic restriper infrastructure: extended balancing ioctl and all
related ioctl data structures, add data structure for tracking
restriper's state to fs_info, etc.  The semantics of the old balancing
ioctl are fully preserved.

Explicitly disallow any volume operations when balance is in progress.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2012-01-16 22:04:47 +02:00
parent 10ea00f55a
commit c9e9f97bdf
6 changed files with 281 additions and 41 deletions
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43
fs/btrfs/ioctl.h
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@@ -109,6 +109,47 @@ struct btrfs_ioctl_fs_info_args {
__u64 reserved[124]; /* pad to 1k */
};
/*
* this is packed, because it should be exactly the same as its disk
* byte order counterpart (struct btrfs_disk_balance_args)
*/
struct btrfs_balance_args {
__u64 profiles;
__u64 usage;
__u64 devid;
__u64 pstart;
__u64 pend;
__u64 vstart;
__u64 vend;
__u64 target;
__u64 flags;
__u64 unused[8];
} __attribute__ ((__packed__));
/* report balance progress to userspace */
struct btrfs_balance_progress {
__u64 expected; /* estimated # of chunks that will be
* relocated to fulfill the request */
__u64 considered; /* # of chunks we have considered so far */
__u64 completed; /* # of chunks relocated so far */
};
struct btrfs_ioctl_balance_args {
__u64 flags; /* in/out */
__u64 state; /* out */
struct btrfs_balance_args data; /* in/out */
struct btrfs_balance_args meta; /* in/out */
struct btrfs_balance_args sys; /* in/out */
struct btrfs_balance_progress stat; /* out */
__u64 unused[72]; /* pad to 1k */
};
#define BTRFS_INO_LOOKUP_PATH_MAX 4080
struct btrfs_ioctl_ino_lookup_args {
__u64 treeid;
@@ -272,6 +313,8 @@ struct btrfs_ioctl_logical_ino_args {
struct btrfs_ioctl_dev_info_args)
#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
struct btrfs_ioctl_fs_info_args)
#define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
struct btrfs_ioctl_balance_args)
#define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
struct btrfs_ioctl_ino_path_args)
#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \