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fs/nfs/blocklayout/blocklayout.h
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/* * linux/fs/nfs/blocklayout/blocklayout.h * * Module for the NFSv4.1 pNFS block layout driver. * * Copyright (c) 2006 The Regents of the University of Michigan. * All rights reserved. * * Andy Adamson <andros@citi.umich.edu> * Fred Isaman <iisaman@umich.edu> * * permission is granted to use, copy, create derivative works and * redistribute this software and such derivative works for any purpose, * so long as the name of the university of michigan is not used in * any advertising or publicity pertaining to the use or distribution * of this software without specific, written prior authorization. if * the above copyright notice or any other identification of the * university of michigan is included in any copy of any portion of * this software, then the disclaimer below must also be included. * * this software is provided as is, without representation from the * university of michigan as to its fitness for any purpose, and without * warranty by the university of michigan of any kind, either express * or implied, including without limitation the implied warranties of * merchantability and fitness for a particular purpose. the regents * of the university of michigan shall not be liable for any damages, * including special, indirect, incidental, or consequential damages, * with respect to any claim arising out or in connection with the use * of the software, even if it has been or is hereafter advised of the * possibility of such damages. */ #ifndef FS_NFS_NFS4BLOCKLAYOUT_H #define FS_NFS_NFS4BLOCKLAYOUT_H #include <linux/device-mapper.h> #include <linux/nfs_fs.h> |
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#include <linux/sunrpc/rpc_pipe_fs.h> |
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#include "../pnfs.h" |
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#define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT) #define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT) |
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struct block_mount_id { spinlock_t bm_lock; /* protects list */ struct list_head bm_devlist; /* holds pnfs_block_dev */ }; |
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struct pnfs_block_dev { struct list_head bm_node; struct nfs4_deviceid bm_mdevid; /* associated devid */ struct block_device *bm_mdev; /* meta device itself */ }; |
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enum exstate4 { PNFS_BLOCK_READWRITE_DATA = 0, PNFS_BLOCK_READ_DATA = 1, PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ }; |
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#define MY_MAX_TAGS (15) /* tag bitnums used must be less than this */ struct my_tree { sector_t mtt_step_size; /* Internal sector alignment */ struct list_head mtt_stub; /* Should be a radix tree */ }; |
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struct pnfs_inval_markings { |
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spinlock_t im_lock; struct my_tree im_tree; /* Sectors that need LAYOUTCOMMIT */ sector_t im_block_size; /* Server blocksize in sectors */ |
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struct list_head im_extents; /* Short extents for INVAL->RW conversion */ |
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}; struct pnfs_inval_tracking { struct list_head it_link; int it_sector; int it_tags; |
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}; /* sector_t fields are all in 512-byte sectors */ struct pnfs_block_extent { struct kref be_refcnt; struct list_head be_node; /* link into lseg list */ struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ struct block_device *be_mdev; sector_t be_f_offset; /* the starting offset in the file */ sector_t be_length; /* the size of the extent */ sector_t be_v_offset; /* the starting offset in the volume */ enum exstate4 be_state; /* the state of this extent */ struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ }; |
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/* Shortened extent used by LAYOUTCOMMIT */ struct pnfs_block_short_extent { struct list_head bse_node; struct nfs4_deviceid bse_devid; struct block_device *bse_mdev; sector_t bse_f_offset; /* the starting offset in the file */ sector_t bse_length; /* the size of the extent */ }; |
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static inline void BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) { |
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spin_lock_init(&marks->im_lock); INIT_LIST_HEAD(&marks->im_tree.mtt_stub); |
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INIT_LIST_HEAD(&marks->im_extents); |
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marks->im_block_size = blocksize; marks->im_tree.mtt_step_size = min((sector_t)PAGE_CACHE_SECTORS, blocksize); |
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} enum extentclass4 { RW_EXTENT = 0, /* READWRTE and INVAL */ RO_EXTENT = 1, /* READ and NONE */ EXTENT_LISTS = 2, }; |
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static inline int bl_choose_list(enum exstate4 state) { if (state == PNFS_BLOCK_READ_DATA || state == PNFS_BLOCK_NONE_DATA) return RO_EXTENT; else return RW_EXTENT; } |
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struct pnfs_block_layout { struct pnfs_layout_hdr bl_layout; struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ spinlock_t bl_ext_lock; /* Protects list manipulation */ struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ struct list_head bl_commit; /* Needs layout commit */ struct list_head bl_committing; /* Layout committing */ unsigned int bl_count; /* entries in bl_commit */ sector_t bl_blocksize; /* Server blocksize in sectors */ }; |
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#define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data)) static inline struct pnfs_block_layout * BLK_LO2EXT(struct pnfs_layout_hdr *lo) |
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{ return container_of(lo, struct pnfs_block_layout, bl_layout); } |
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static inline struct pnfs_block_layout * BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) { return BLK_LO2EXT(lseg->pls_layout); } |
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struct bl_dev_msg { |
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int32_t status; |
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uint32_t major, minor; }; struct bl_msg_hdr { u8 type; u16 totallen; /* length of entire message, including hdr itself */ }; extern struct dentry *bl_device_pipe; extern wait_queue_head_t bl_wq; #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ /* blocklayoutdev.c */ |
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ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t); void bl_pipe_destroy_msg(struct rpc_pipe_msg *); struct block_device *nfs4_blkdev_get(dev_t dev); int nfs4_blkdev_put(struct block_device *bdev); struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, |
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struct pnfs_device *dev); |
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int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); |
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/* blocklayoutdm.c */ void bl_free_block_dev(struct pnfs_block_dev *bdev); |
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/* extents.c */ |
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struct pnfs_block_extent * bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, struct pnfs_block_extent **cow_read); |
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int bl_mark_sectors_init(struct pnfs_inval_markings *marks, |
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sector_t offset, sector_t length); |
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void bl_put_extent(struct pnfs_block_extent *be); |
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struct pnfs_block_extent *bl_alloc_extent(void); |
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int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect); |
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int encode_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, struct xdr_stream *xdr, const struct nfs4_layoutcommit_args *arg); |
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void clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl, const struct nfs4_layoutcommit_args *arg, int status); |
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int bl_add_merge_extent(struct pnfs_block_layout *bl, struct pnfs_block_extent *new); |
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int bl_mark_for_commit(struct pnfs_block_extent *be, |
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sector_t offset, sector_t length, struct pnfs_block_short_extent *new); int bl_push_one_short_extent(struct pnfs_inval_markings *marks); struct pnfs_block_short_extent * bl_pop_one_short_extent(struct pnfs_inval_markings *marks); void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free); |
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#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |