diff options
Diffstat (limited to 'fs/nfs/blocklayout/blocklayout.h')
-rw-r--r-- | fs/nfs/blocklayout/blocklayout.h | 83 |
1 files changed, 77 insertions, 6 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h index c98d98a62664..92dca9e90d8d 100644 --- a/fs/nfs/blocklayout/blocklayout.h +++ b/fs/nfs/blocklayout/blocklayout.h @@ -44,9 +44,77 @@ #define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT) #define SECTOR_SIZE (1 << SECTOR_SHIFT) +struct pnfs_block_dev; + +enum pnfs_block_volume_type { + PNFS_BLOCK_VOLUME_SIMPLE = 0, + PNFS_BLOCK_VOLUME_SLICE = 1, + PNFS_BLOCK_VOLUME_CONCAT = 2, + PNFS_BLOCK_VOLUME_STRIPE = 3, +}; + +#define PNFS_BLOCK_MAX_UUIDS 4 +#define PNFS_BLOCK_MAX_DEVICES 64 + +/* + * Random upper cap for the uuid length to avoid unbounded allocation. + * Not actually limited by the protocol. + */ +#define PNFS_BLOCK_UUID_LEN 128 + + +struct pnfs_block_volume { + enum pnfs_block_volume_type type; + union { + struct { + int len; + int nr_sigs; + struct { + u64 offset; + u32 sig_len; + u8 sig[PNFS_BLOCK_UUID_LEN]; + } sigs[PNFS_BLOCK_MAX_UUIDS]; + } simple; + struct { + u64 start; + u64 len; + u32 volume; + } slice; + struct { + u32 volumes_count; + u32 volumes[PNFS_BLOCK_MAX_DEVICES]; + } concat; + struct { + u64 chunk_size; + u32 volumes_count; + u32 volumes[PNFS_BLOCK_MAX_DEVICES]; + } stripe; + }; +}; + +struct pnfs_block_dev_map { + sector_t start; + sector_t len; + + sector_t disk_offset; + struct block_device *bdev; +}; + struct pnfs_block_dev { - struct nfs4_deviceid_node d_node; - struct block_device *d_bdev; + struct nfs4_deviceid_node node; + + u64 start; + u64 len; + + u32 nr_children; + struct pnfs_block_dev *children; + u64 chunk_size; + + struct block_device *bdev; + u64 disk_offset; + + bool (*map)(struct pnfs_block_dev *dev, u64 offset, + struct pnfs_block_dev_map *map); }; enum exstate4 { @@ -110,6 +178,11 @@ struct bl_msg_hdr { #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ +/* dev.c */ +struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server, + struct pnfs_device *pdev, gfp_t gfp_mask); +void bl_free_deviceid_node(struct nfs4_deviceid_node *d); + /* extent_tree.c */ int ext_tree_insert(struct pnfs_block_layout *bl, struct pnfs_block_extent *new); @@ -123,10 +196,8 @@ int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg); void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status); /* rpc_pipefs.c */ -struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server, - struct pnfs_device *pdev, gfp_t gfp_mask); -void bl_free_deviceid_node(struct nfs4_deviceid_node *d); - +dev_t bl_resolve_deviceid(struct nfs_server *server, + struct pnfs_block_volume *b, gfp_t gfp_mask); int __init bl_init_pipefs(void); void __exit bl_cleanup_pipefs(void); |