mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
a75b9df9d3
Currently, writebacks may end up recursing back into the filesystem due to GFP_KERNEL direct reclaims in the pnfs subsystem. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/*
|
|
* NFSv4 file layout driver data structures.
|
|
*
|
|
* Copyright (c) 2002
|
|
* The Regents of the University of Michigan
|
|
* All Rights Reserved
|
|
*
|
|
* Dean Hildebrand <dhildebz@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 or warranty
|
|
* of any kind either express or implied, including without limitation
|
|
* the implied warranties of merchantability, fitness for a particular
|
|
* purpose, or noninfringement. 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 of 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_NFS4FILELAYOUT_H
|
|
#define FS_NFS_NFS4FILELAYOUT_H
|
|
|
|
#include "pnfs.h"
|
|
|
|
/*
|
|
* Field testing shows we need to support up to 4096 stripe indices.
|
|
* We store each index as a u8 (u32 on the wire) to keep the memory footprint
|
|
* reasonable. This in turn means we support a maximum of 256
|
|
* RFC 5661 multipath_list4 structures.
|
|
*/
|
|
#define NFS4_PNFS_MAX_STRIPE_CNT 4096
|
|
#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
|
|
|
|
enum stripetype4 {
|
|
STRIPE_SPARSE = 1,
|
|
STRIPE_DENSE = 2
|
|
};
|
|
|
|
/* Individual ip address */
|
|
struct nfs4_pnfs_ds {
|
|
struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
|
|
u32 ds_ip_addr;
|
|
u32 ds_port;
|
|
struct nfs_client *ds_clp;
|
|
atomic_t ds_count;
|
|
};
|
|
|
|
/* nfs4_file_layout_dsaddr flags */
|
|
#define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
|
|
|
|
struct nfs4_file_layout_dsaddr {
|
|
struct hlist_node node;
|
|
struct nfs4_deviceid deviceid;
|
|
atomic_t ref;
|
|
unsigned long flags;
|
|
u32 stripe_count;
|
|
u8 *stripe_indices;
|
|
u32 ds_num;
|
|
struct nfs4_pnfs_ds *ds_list[1];
|
|
};
|
|
|
|
struct nfs4_filelayout_segment {
|
|
struct pnfs_layout_segment generic_hdr;
|
|
u32 stripe_type;
|
|
u32 commit_through_mds;
|
|
u32 stripe_unit;
|
|
u32 first_stripe_index;
|
|
u64 pattern_offset;
|
|
struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
|
|
unsigned int num_fh;
|
|
struct nfs_fh **fh_array;
|
|
struct list_head *commit_buckets; /* Sort commits to ds */
|
|
int number_of_buckets;
|
|
};
|
|
|
|
static inline struct nfs4_filelayout_segment *
|
|
FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
|
|
{
|
|
return container_of(lseg,
|
|
struct nfs4_filelayout_segment,
|
|
generic_hdr);
|
|
}
|
|
|
|
extern struct nfs_fh *
|
|
nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
|
|
|
|
extern void print_ds(struct nfs4_pnfs_ds *ds);
|
|
extern void print_deviceid(struct nfs4_deviceid *dev_id);
|
|
u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
|
|
u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
|
|
struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
|
|
u32 ds_idx);
|
|
extern struct nfs4_file_layout_dsaddr *
|
|
nfs4_fl_find_get_deviceid(struct nfs4_deviceid *dev_id);
|
|
extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
|
|
struct nfs4_file_layout_dsaddr *
|
|
get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
|
|
|
|
#endif /* FS_NFS_NFS4FILELAYOUT_H */
|