mirror of https://gitee.com/openkylin/linux.git
816 lines
24 KiB
C
816 lines
24 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NFS internal definitions
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*/
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#include "nfs4_fs.h"
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#include <linux/fs_context.h>
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#include <linux/security.h>
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#include <linux/crc32.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/nfs_page.h>
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#include <linux/wait_bit.h>
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#define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
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extern const struct export_operations nfs_export_ops;
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struct nfs_string;
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struct nfs_pageio_descriptor;
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static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
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{
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if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
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fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
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}
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static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
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{
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if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
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(((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
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((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
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return 0;
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return 1;
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}
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static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
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{
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if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
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return false;
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if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
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return false;
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return true;
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}
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/*
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* Note: RFC 1813 doesn't limit the number of auth flavors that
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* a server can return, so make something up.
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*/
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#define NFS_MAX_SECFLAVORS (12)
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/*
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* Value used if the user did not specify a port value.
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*/
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#define NFS_UNSPEC_PORT (-1)
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#define NFS_UNSPEC_RETRANS (UINT_MAX)
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#define NFS_UNSPEC_TIMEO (UINT_MAX)
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/*
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* Maximum number of pages that readdir can use for creating
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* a vmapped array of pages.
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*/
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#define NFS_MAX_READDIR_PAGES 8
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struct nfs_client_initdata {
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unsigned long init_flags;
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const char *hostname; /* Hostname of the server */
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const struct sockaddr *addr; /* Address of the server */
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const char *nodename; /* Hostname of the client */
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const char *ip_addr; /* IP address of the client */
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size_t addrlen;
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struct nfs_subversion *nfs_mod;
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int proto;
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u32 minorversion;
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unsigned int nconnect;
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struct net *net;
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const struct rpc_timeout *timeparms;
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const struct cred *cred;
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};
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/*
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* In-kernel mount arguments
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*/
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struct nfs_fs_context {
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bool internal;
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bool skip_reconfig_option_check;
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bool need_mount;
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bool sloppy;
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unsigned int flags; /* NFS{,4}_MOUNT_* flags */
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unsigned int rsize, wsize;
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unsigned int timeo, retrans;
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unsigned int acregmin, acregmax;
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unsigned int acdirmin, acdirmax;
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unsigned int namlen;
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unsigned int options;
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unsigned int bsize;
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struct nfs_auth_info auth_info;
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rpc_authflavor_t selected_flavor;
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char *client_address;
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unsigned int version;
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unsigned int minorversion;
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char *fscache_uniq;
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unsigned short protofamily;
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unsigned short mountfamily;
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struct {
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union {
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struct sockaddr address;
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struct sockaddr_storage _address;
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};
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size_t addrlen;
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char *hostname;
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u32 version;
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int port;
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unsigned short protocol;
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} mount_server;
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struct {
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union {
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struct sockaddr address;
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struct sockaddr_storage _address;
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};
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size_t addrlen;
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char *hostname;
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char *export_path;
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int port;
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unsigned short protocol;
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unsigned short nconnect;
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unsigned short export_path_len;
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} nfs_server;
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struct nfs_fh *mntfh;
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struct nfs_server *server;
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struct nfs_subversion *nfs_mod;
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/* Information for a cloned mount. */
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struct nfs_clone_mount {
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struct super_block *sb;
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struct dentry *dentry;
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struct nfs_fattr *fattr;
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unsigned int inherited_bsize;
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} clone_data;
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};
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#define nfs_errorf(fc, fmt, ...) errorf(fc, fmt, ## __VA_ARGS__)
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#define nfs_invalf(fc, fmt, ...) invalf(fc, fmt, ## __VA_ARGS__)
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#define nfs_warnf(fc, fmt, ...) warnf(fc, fmt, ## __VA_ARGS__)
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static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
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{
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return fc->fs_private;
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}
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/* mount_clnt.c */
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struct nfs_mount_request {
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struct sockaddr *sap;
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size_t salen;
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char *hostname;
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char *dirpath;
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u32 version;
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unsigned short protocol;
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struct nfs_fh *fh;
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int noresvport;
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unsigned int *auth_flav_len;
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rpc_authflavor_t *auth_flavs;
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struct net *net;
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};
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extern int nfs_mount(struct nfs_mount_request *info);
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extern void nfs_umount(const struct nfs_mount_request *info);
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/* client.c */
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extern const struct rpc_program nfs_program;
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extern void nfs_clients_init(struct net *net);
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extern void nfs_clients_exit(struct net *net);
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extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
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int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
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struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
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int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
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void nfs_server_insert_lists(struct nfs_server *);
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void nfs_server_remove_lists(struct nfs_server *);
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void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
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int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
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rpc_authflavor_t);
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struct nfs_server *nfs_alloc_server(void);
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void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
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extern void nfs_put_client(struct nfs_client *);
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extern void nfs_free_client(struct nfs_client *);
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extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
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extern struct nfs_client *
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nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
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struct nfs4_sessionid *, u32);
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extern struct nfs_server *nfs_create_server(struct fs_context *);
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extern struct nfs_server *nfs4_create_server(struct fs_context *);
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extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
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extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
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struct sockaddr *sap, size_t salen,
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struct net *net);
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extern void nfs_free_server(struct nfs_server *server);
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extern struct nfs_server *nfs_clone_server(struct nfs_server *,
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struct nfs_fh *,
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struct nfs_fattr *,
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rpc_authflavor_t);
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extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
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extern int nfs_client_init_status(const struct nfs_client *clp);
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extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
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extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
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extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
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const struct sockaddr *ds_addr,
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int ds_addrlen, int ds_proto,
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unsigned int ds_timeo,
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unsigned int ds_retrans,
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u32 minor_version);
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extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
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struct inode *);
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extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
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const struct sockaddr *ds_addr, int ds_addrlen,
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int ds_proto, unsigned int ds_timeo,
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unsigned int ds_retrans);
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#ifdef CONFIG_PROC_FS
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extern int __init nfs_fs_proc_init(void);
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extern void nfs_fs_proc_exit(void);
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extern int nfs_fs_proc_net_init(struct net *net);
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extern void nfs_fs_proc_net_exit(struct net *net);
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#else
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static inline int nfs_fs_proc_net_init(struct net *net)
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{
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return 0;
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}
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static inline void nfs_fs_proc_net_exit(struct net *net)
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{
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}
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static inline int nfs_fs_proc_init(void)
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{
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return 0;
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}
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static inline void nfs_fs_proc_exit(void)
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{
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}
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#endif
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/* callback_xdr.c */
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extern const struct svc_version nfs4_callback_version1;
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extern const struct svc_version nfs4_callback_version4;
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/* fs_context.c */
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extern struct file_system_type nfs_fs_type;
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/* pagelist.c */
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extern int __init nfs_init_nfspagecache(void);
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extern void nfs_destroy_nfspagecache(void);
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extern int __init nfs_init_readpagecache(void);
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extern void nfs_destroy_readpagecache(void);
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extern int __init nfs_init_writepagecache(void);
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extern void nfs_destroy_writepagecache(void);
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extern int __init nfs_init_directcache(void);
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extern void nfs_destroy_directcache(void);
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extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
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struct nfs_pgio_header *hdr,
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void (*release)(struct nfs_pgio_header *hdr));
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void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
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int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
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extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
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struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
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void nfs_pgio_header_free(struct nfs_pgio_header *);
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int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
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int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
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const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
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const struct rpc_call_ops *call_ops, int how, int flags);
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void nfs_free_request(struct nfs_page *req);
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struct nfs_pgio_mirror *
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nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
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static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
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{
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WARN_ON_ONCE(desc->pg_mirror_count < 1);
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return desc->pg_mirror_count > 1;
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}
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static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
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const struct nfs_open_context *ctx2)
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{
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return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
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}
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/* nfs2xdr.c */
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extern const struct rpc_procinfo nfs_procedures[];
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extern int nfs2_decode_dirent(struct xdr_stream *,
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struct nfs_entry *, bool);
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/* nfs3xdr.c */
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extern const struct rpc_procinfo nfs3_procedures[];
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extern int nfs3_decode_dirent(struct xdr_stream *,
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struct nfs_entry *, bool);
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/* nfs4xdr.c */
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern int nfs4_decode_dirent(struct xdr_stream *,
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struct nfs_entry *, bool);
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#endif
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#ifdef CONFIG_NFS_V4_1
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extern const u32 nfs41_maxread_overhead;
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extern const u32 nfs41_maxwrite_overhead;
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extern const u32 nfs41_maxgetdevinfo_overhead;
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#endif
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/* nfs4proc.c */
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern const struct rpc_procinfo nfs4_procedures[];
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#endif
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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
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extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
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static inline struct nfs4_label *
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nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
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{
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if (!dst || !src)
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return NULL;
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if (src->len > NFS4_MAXLABELLEN)
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return NULL;
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dst->lfs = src->lfs;
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dst->pi = src->pi;
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dst->len = src->len;
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memcpy(dst->label, src->label, src->len);
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return dst;
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}
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static inline void nfs4_label_free(struct nfs4_label *label)
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{
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if (label) {
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kfree(label->label);
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kfree(label);
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}
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return;
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}
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static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
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{
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if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
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nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
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}
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#else
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static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
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static inline void nfs4_label_free(void *label) {}
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static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
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{
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}
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static inline struct nfs4_label *
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nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
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{
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return NULL;
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}
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#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
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/* proc.c */
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void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
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extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
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const struct nfs_client_initdata *);
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/* dir.c */
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extern void nfs_advise_use_readdirplus(struct inode *dir);
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extern void nfs_force_use_readdirplus(struct inode *dir);
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extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
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struct shrink_control *sc);
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extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
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struct shrink_control *sc);
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struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
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int nfs_create(struct inode *, struct dentry *, umode_t, bool);
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int nfs_mkdir(struct inode *, struct dentry *, umode_t);
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int nfs_rmdir(struct inode *, struct dentry *);
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int nfs_unlink(struct inode *, struct dentry *);
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int nfs_symlink(struct inode *, struct dentry *, const char *);
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int nfs_link(struct dentry *, struct inode *, struct dentry *);
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int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
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int nfs_rename(struct inode *, struct dentry *,
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struct inode *, struct dentry *, unsigned int);
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/* file.c */
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int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
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loff_t nfs_file_llseek(struct file *, loff_t, int);
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ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
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int nfs_file_mmap(struct file *, struct vm_area_struct *);
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ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
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int nfs_file_release(struct inode *, struct file *);
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int nfs_lock(struct file *, int, struct file_lock *);
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int nfs_flock(struct file *, int, struct file_lock *);
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int nfs_check_flags(int);
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/* inode.c */
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extern struct workqueue_struct *nfsiod_workqueue;
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extern struct inode *nfs_alloc_inode(struct super_block *sb);
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extern void nfs_free_inode(struct inode *);
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extern int nfs_write_inode(struct inode *, struct writeback_control *);
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extern int nfs_drop_inode(struct inode *);
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extern void nfs_clear_inode(struct inode *);
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extern void nfs_evict_inode(struct inode *);
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void nfs_zap_acl_cache(struct inode *inode);
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extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
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extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
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extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
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/* super.c */
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extern const struct super_operations nfs_sops;
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bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
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int nfs_try_get_tree(struct fs_context *);
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int nfs_get_tree_common(struct fs_context *);
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void nfs_kill_super(struct super_block *);
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extern struct rpc_stat nfs_rpcstat;
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extern int __init register_nfs_fs(void);
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extern void __exit unregister_nfs_fs(void);
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extern bool nfs_sb_active(struct super_block *sb);
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extern void nfs_sb_deactive(struct super_block *sb);
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extern int nfs_client_for_each_server(struct nfs_client *clp,
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int (*fn)(struct nfs_server *, void *),
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void *data);
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/* io.c */
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extern void nfs_start_io_read(struct inode *inode);
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extern void nfs_end_io_read(struct inode *inode);
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extern void nfs_start_io_write(struct inode *inode);
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extern void nfs_end_io_write(struct inode *inode);
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extern void nfs_start_io_direct(struct inode *inode);
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extern void nfs_end_io_direct(struct inode *inode);
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static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
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{
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return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
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}
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/* namespace.c */
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#define NFS_PATH_CANONICAL 1
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extern char *nfs_path(char **p, struct dentry *dentry,
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char *buffer, ssize_t buflen, unsigned flags);
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extern struct vfsmount *nfs_d_automount(struct path *path);
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int nfs_submount(struct fs_context *, struct nfs_server *);
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int nfs_do_submount(struct fs_context *);
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/* getroot.c */
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extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
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#endif
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struct nfs_pgio_completion_ops;
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/* read.c */
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extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
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struct inode *inode, bool force_mds,
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const struct nfs_pgio_completion_ops *compl_ops);
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extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
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extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
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/* super.c */
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void nfs_umount_begin(struct super_block *);
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int nfs_statfs(struct dentry *, struct kstatfs *);
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int nfs_show_options(struct seq_file *, struct dentry *);
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int nfs_show_devname(struct seq_file *, struct dentry *);
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int nfs_show_path(struct seq_file *, struct dentry *);
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int nfs_show_stats(struct seq_file *, struct dentry *);
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int nfs_reconfigure(struct fs_context *);
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/* write.c */
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extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
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struct inode *inode, int ioflags, bool force_mds,
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const struct nfs_pgio_completion_ops *compl_ops);
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extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
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extern void nfs_commit_free(struct nfs_commit_data *p);
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extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
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extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
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extern int nfs_initiate_commit(struct rpc_clnt *clnt,
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struct nfs_commit_data *data,
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const struct nfs_rpc_ops *nfs_ops,
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const struct rpc_call_ops *call_ops,
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int how, int flags);
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extern void nfs_init_commit(struct nfs_commit_data *data,
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struct list_head *head,
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struct pnfs_layout_segment *lseg,
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struct nfs_commit_info *cinfo);
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int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
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struct nfs_commit_info *cinfo, int max);
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unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
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int nfs_scan_commit(struct inode *inode, struct list_head *dst,
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struct nfs_commit_info *cinfo);
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void nfs_mark_request_commit(struct nfs_page *req,
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struct pnfs_layout_segment *lseg,
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struct nfs_commit_info *cinfo,
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u32 ds_commit_idx);
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int nfs_write_need_commit(struct nfs_pgio_header *);
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void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
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int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
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int how, struct nfs_commit_info *cinfo);
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void nfs_retry_commit(struct list_head *page_list,
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struct pnfs_layout_segment *lseg,
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struct nfs_commit_info *cinfo,
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u32 ds_commit_idx);
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void nfs_commitdata_release(struct nfs_commit_data *data);
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void nfs_request_add_commit_list(struct nfs_page *req,
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struct nfs_commit_info *cinfo);
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void nfs_request_add_commit_list_locked(struct nfs_page *req,
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struct list_head *dst,
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struct nfs_commit_info *cinfo);
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void nfs_request_remove_commit_list(struct nfs_page *req,
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struct nfs_commit_info *cinfo);
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void nfs_init_cinfo(struct nfs_commit_info *cinfo,
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struct inode *inode,
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struct nfs_direct_req *dreq);
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int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
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bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
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void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
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int nfs_filemap_write_and_wait_range(struct address_space *mapping,
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loff_t lstart, loff_t lend);
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#ifdef CONFIG_NFS_V4_1
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static inline void
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pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
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unsigned int nbuckets)
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{
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unsigned int i;
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for (i = 0; i < nbuckets; i++)
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buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
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}
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static inline
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void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
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{
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struct pnfs_commit_array *array;
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pnfs_bucket_clear_pnfs_ds_commit_verifiers(cinfo->buckets,
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cinfo->nbuckets);
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list_for_each_entry(array, &cinfo->commits, cinfo_list)
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pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
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array->nbuckets);
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}
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#else
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static inline
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void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
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{
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}
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#endif
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#ifdef CONFIG_MIGRATION
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extern int nfs_migrate_page(struct address_space *,
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struct page *, struct page *, enum migrate_mode);
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#endif
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static inline int
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nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
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const struct nfs_write_verifier *v2)
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{
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return memcmp(v1->data, v2->data, sizeof(v1->data));
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}
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static inline bool
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nfs_write_match_verf(const struct nfs_writeverf *verf,
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struct nfs_page *req)
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{
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return verf->committed > NFS_UNSTABLE &&
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!nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
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}
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/* unlink.c */
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extern struct rpc_task *
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nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
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struct dentry *old_dentry, struct dentry *new_dentry,
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void (*complete)(struct rpc_task *, struct nfs_renamedata *));
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extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
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/* direct.c */
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void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
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struct nfs_direct_req *dreq);
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extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
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/* nfs4proc.c */
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extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
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const struct nfs_client_initdata *);
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extern int nfs40_walk_client_list(struct nfs_client *clp,
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struct nfs_client **result,
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const struct cred *cred);
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extern int nfs41_walk_client_list(struct nfs_client *clp,
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struct nfs_client **result,
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const struct cred *cred);
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extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
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struct rpc_xprt *xprt,
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void *data);
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static inline struct inode *nfs_igrab_and_active(struct inode *inode)
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{
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inode = igrab(inode);
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if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
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iput(inode);
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inode = NULL;
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}
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return inode;
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}
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static inline void nfs_iput_and_deactive(struct inode *inode)
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{
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if (inode != NULL) {
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struct super_block *sb = inode->i_sb;
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iput(inode);
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nfs_sb_deactive(sb);
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}
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}
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/*
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* Determine the device name as a string
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*/
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static inline char *nfs_devname(struct dentry *dentry,
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char *buffer, ssize_t buflen)
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{
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char *dummy;
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return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
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}
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/*
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* Determine the actual block size (and log2 thereof)
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*/
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static inline
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unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
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{
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/* make sure blocksize is a power of two */
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if ((bsize & (bsize - 1)) || nrbitsp) {
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unsigned char nrbits;
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for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
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;
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bsize = 1 << nrbits;
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if (nrbitsp)
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*nrbitsp = nrbits;
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}
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return bsize;
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}
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/*
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* Calculate the number of 512byte blocks used.
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*/
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static inline blkcnt_t nfs_calc_block_size(u64 tsize)
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{
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blkcnt_t used = (tsize + 511) >> 9;
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return (used > ULONG_MAX) ? ULONG_MAX : used;
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}
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/*
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* Compute and set NFS server blocksize
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*/
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static inline
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unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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{
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if (bsize < NFS_MIN_FILE_IO_SIZE)
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bsize = NFS_DEF_FILE_IO_SIZE;
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else if (bsize >= NFS_MAX_FILE_IO_SIZE)
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bsize = NFS_MAX_FILE_IO_SIZE;
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return nfs_block_bits(bsize, nrbitsp);
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}
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/*
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* Determine the maximum file size for a superblock
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*/
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static inline
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void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
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{
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sb->s_maxbytes = (loff_t)maxfilesize;
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if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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}
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/*
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* Record the page as unstable and mark its inode as dirty.
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*/
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static inline
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void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
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{
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if (!cinfo->dreq) {
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struct inode *inode = page_file_mapping(page)->host;
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inc_node_page_state(page, NR_UNSTABLE_NFS);
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inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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}
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}
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/*
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* Determine the number of bytes of data the page contains
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*/
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static inline
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unsigned int nfs_page_length(struct page *page)
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{
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loff_t i_size = i_size_read(page_file_mapping(page)->host);
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if (i_size > 0) {
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pgoff_t index = page_index(page);
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pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
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if (index < end_index)
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return PAGE_SIZE;
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if (index == end_index)
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return ((i_size - 1) & ~PAGE_MASK) + 1;
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}
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return 0;
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}
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/*
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* Convert a umode to a dirent->d_type
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*/
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static inline
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unsigned char nfs_umode_to_dtype(umode_t mode)
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{
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return (mode >> 12) & 15;
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}
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/*
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* Determine the number of pages in an array of length 'len' and
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* with a base offset of 'base'
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*/
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static inline
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unsigned int nfs_page_array_len(unsigned int base, size_t len)
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{
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return ((unsigned long)len + (unsigned long)base +
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PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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/*
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* Convert a struct timespec64 into a 64-bit change attribute
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*
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* This does approximately the same thing as timespec64_to_ns(),
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* but for calculation efficiency, we multiply the seconds by
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* 1024*1024*1024.
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*/
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static inline
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u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
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{
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return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
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}
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#ifdef CONFIG_CRC32
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/**
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* nfs_fhandle_hash - calculate the crc32 hash for the filehandle
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* @fh - pointer to filehandle
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*
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* returns a crc32 hash for the filehandle that is compatible with
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* the one displayed by "wireshark".
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*/
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static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
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{
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return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
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}
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static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
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{
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return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
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NFS4_STATEID_OTHER_SIZE);
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}
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#else
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static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
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{
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return 0;
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}
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static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
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{
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return 0;
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}
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#endif
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static inline bool nfs_error_is_fatal(int err)
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{
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switch (err) {
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case -ERESTARTSYS:
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case -EINTR:
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case -EACCES:
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case -EDQUOT:
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case -EFBIG:
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case -EIO:
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case -ENOSPC:
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case -EROFS:
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case -ESTALE:
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case -E2BIG:
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case -ENOMEM:
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case -ETIMEDOUT:
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return true;
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default:
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return false;
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}
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}
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static inline bool nfs_error_is_fatal_on_server(int err)
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{
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switch (err) {
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case 0:
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case -ERESTARTSYS:
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case -EINTR:
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return false;
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}
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return nfs_error_is_fatal(err);
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}
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/*
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* Select between a default port value and a user-specified port value.
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* If a zero value is set, then autobind will be used.
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*/
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static inline void nfs_set_port(struct sockaddr *sap, int *port,
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const unsigned short default_port)
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{
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if (*port == NFS_UNSPEC_PORT)
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*port = default_port;
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rpc_set_port(sap, *port);
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}
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