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640 lines
21 KiB
C
640 lines
21 KiB
C
/*
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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/mount.h>
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#include <linux/security.h>
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#include <linux/crc32.h>
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#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
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struct nfs_string;
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/* Maximum number of readahead requests
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* FIXME: this should really be a sysctl so that users may tune it to suit
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* their needs. People that do NFS over a slow network, might for
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* instance want to reduce it to something closer to 1 for improved
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* interactive response.
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*/
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#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
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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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fattr->fileid = fattr->mounted_on_fileid;
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return 1;
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}
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struct nfs_clone_mount {
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const struct super_block *sb;
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const struct dentry *dentry;
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struct nfs_fh *fh;
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struct nfs_fattr *fattr;
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char *hostname;
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char *mnt_path;
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struct sockaddr *addr;
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size_t addrlen;
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rpc_authflavor_t authflavor;
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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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/*
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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;
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const struct sockaddr *addr;
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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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struct net *net;
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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_parsed_mount_data {
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int 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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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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bool need_mount;
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struct {
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struct sockaddr_storage address;
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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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struct sockaddr_storage address;
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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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} nfs_server;
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struct security_mnt_opts lsm_opts;
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struct net *net;
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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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struct nfs_mount_info {
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void (*fill_super)(struct super_block *, struct nfs_mount_info *);
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int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
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struct nfs_parsed_mount_data *parsed;
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struct nfs_clone_mount *cloned;
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struct nfs_fh *mntfh;
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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 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 rpc_timeout *, rpc_authflavor_t);
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struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
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const struct rpc_timeout *, const char *,
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rpc_authflavor_t);
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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 *, int, unsigned int, unsigned int);
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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_cleanup_cb_ident_idr(struct net *);
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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 nfs_mount_info *,
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struct nfs_subversion *);
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extern struct nfs_server *nfs4_create_server(
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struct nfs_mount_info *,
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struct nfs_subversion *);
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extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
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struct nfs_fh *);
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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 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_client* mds_clp,
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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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extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
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struct inode *);
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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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#else
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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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#ifdef CONFIG_NFS_V4_1
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int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
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#endif
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/* nfs3client.c */
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#if IS_ENABLED(CONFIG_NFS_V3)
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struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
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struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
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struct nfs_fattr *, rpc_authflavor_t);
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#endif
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/* callback_xdr.c */
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extern struct svc_version nfs4_callback_version1;
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extern struct svc_version nfs4_callback_version4;
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struct nfs_pageio_descriptor;
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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 bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
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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_io_counter *c);
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static inline void nfs_iocounter_init(struct nfs_io_counter *c)
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{
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c->flags = 0;
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atomic_set(&c->io_count, 0);
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}
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/* nfs2xdr.c */
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extern struct rpc_procinfo nfs_procedures[];
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extern int nfs2_decode_dirent(struct xdr_stream *,
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struct nfs_entry *, int);
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/* nfs3xdr.c */
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extern struct rpc_procinfo nfs3_procedures[];
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extern int nfs3_decode_dirent(struct xdr_stream *,
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struct nfs_entry *, int);
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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 *, int);
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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 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 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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#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 rpc_timeout *timeparms,
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const char *ip_addr);
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/* dir.c */
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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 *, struct inode *, struct dentry *);
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/* file.c */
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int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
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loff_t nfs_file_llseek(struct file *, loff_t, int);
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int nfs_file_flush(struct file *, fl_owner_t);
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ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
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ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
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size_t, unsigned int);
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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 *, const struct iovec *, unsigned long, loff_t);
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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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ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
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size_t, unsigned int);
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int nfs_check_flags(int);
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int nfs_setlease(struct file *, long, struct file_lock **);
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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_destroy_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 int nfs_wait_bit_killable(void *word);
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/* super.c */
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extern const struct super_operations nfs_sops;
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extern struct file_system_type nfs_fs_type;
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extern struct file_system_type nfs_xdev_fs_type;
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern struct file_system_type nfs4_xdev_fs_type;
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extern struct file_system_type nfs4_referral_fs_type;
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#endif
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bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
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struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
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struct nfs_subversion *);
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void nfs_initialise_sb(struct super_block *);
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int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
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int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
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struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
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struct nfs_mount_info *, struct nfs_subversion *);
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struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
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struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
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const char *, struct nfs_mount_info *);
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void nfs_kill_super(struct super_block *);
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void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
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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 void nfs_sb_active(struct super_block *sb);
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extern void nfs_sb_deactive(struct super_block *sb);
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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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struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
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struct nfs_fh *, struct nfs_fattr *);
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struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
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struct nfs_fattr *, rpc_authflavor_t);
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/* getroot.c */
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extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
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const char *);
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#if IS_ENABLED(CONFIG_NFS_V4)
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extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
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const char *);
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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 struct nfs_read_header *nfs_readhdr_alloc(void);
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extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
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extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
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struct inode *inode,
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const struct nfs_pgio_completion_ops *compl_ops);
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extern int nfs_initiate_read(struct rpc_clnt *clnt,
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struct nfs_read_data *data,
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const struct rpc_call_ops *call_ops, int flags);
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extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
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extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
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struct nfs_pgio_header *hdr);
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extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
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extern void nfs_readdata_release(struct nfs_read_data *rdata);
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/* super.c */
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void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
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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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void nfs_put_super(struct super_block *);
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int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
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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,
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const struct nfs_pgio_completion_ops *compl_ops);
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extern struct nfs_write_header *nfs_writehdr_alloc(void);
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extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
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extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
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struct nfs_pgio_header *hdr);
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extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
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extern void nfs_writedata_release(struct nfs_write_data *wdata);
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extern void nfs_commit_free(struct nfs_commit_data *p);
|
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extern int nfs_initiate_write(struct rpc_clnt *clnt,
|
|
struct nfs_write_data *data,
|
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const struct rpc_call_ops *call_ops,
|
|
int how, int flags);
|
|
extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
|
|
extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
|
|
extern int nfs_initiate_commit(struct rpc_clnt *clnt,
|
|
struct nfs_commit_data *data,
|
|
const struct rpc_call_ops *call_ops,
|
|
int how, int flags);
|
|
extern void nfs_init_commit(struct nfs_commit_data *data,
|
|
struct list_head *head,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo);
|
|
int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo, int max);
|
|
int nfs_scan_commit(struct inode *inode, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo);
|
|
void nfs_mark_request_commit(struct nfs_page *req,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo);
|
|
int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
|
|
int how, struct nfs_commit_info *cinfo);
|
|
void nfs_retry_commit(struct list_head *page_list,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo);
|
|
void nfs_commitdata_release(struct nfs_commit_data *data);
|
|
void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo);
|
|
void nfs_request_remove_commit_list(struct nfs_page *req,
|
|
struct nfs_commit_info *cinfo);
|
|
void nfs_init_cinfo(struct nfs_commit_info *cinfo,
|
|
struct inode *inode,
|
|
struct nfs_direct_req *dreq);
|
|
int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
|
|
bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
extern int nfs_migrate_page(struct address_space *,
|
|
struct page *, struct page *, enum migrate_mode);
|
|
#else
|
|
#define nfs_migrate_page NULL
|
|
#endif
|
|
|
|
/* unlink.c */
|
|
extern struct rpc_task *
|
|
nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
|
|
struct dentry *old_dentry, struct dentry *new_dentry,
|
|
void (*complete)(struct rpc_task *, struct nfs_renamedata *));
|
|
extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
|
|
|
|
/* direct.c */
|
|
void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
|
|
struct nfs_direct_req *dreq);
|
|
static inline void nfs_inode_dio_wait(struct inode *inode)
|
|
{
|
|
inode_dio_wait(inode);
|
|
}
|
|
extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
|
|
|
|
/* nfs4proc.c */
|
|
extern void __nfs4_read_done_cb(struct nfs_read_data *);
|
|
extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
|
|
const struct rpc_timeout *timeparms,
|
|
const char *ip_addr);
|
|
extern int nfs40_walk_client_list(struct nfs_client *clp,
|
|
struct nfs_client **result,
|
|
struct rpc_cred *cred);
|
|
extern int nfs41_walk_client_list(struct nfs_client *clp,
|
|
struct nfs_client **result,
|
|
struct rpc_cred *cred);
|
|
|
|
/*
|
|
* Determine the device name as a string
|
|
*/
|
|
static inline char *nfs_devname(struct dentry *dentry,
|
|
char *buffer, ssize_t buflen)
|
|
{
|
|
char *dummy;
|
|
return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
|
|
}
|
|
|
|
/*
|
|
* Determine the actual block size (and log2 thereof)
|
|
*/
|
|
static inline
|
|
unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
|
|
{
|
|
/* make sure blocksize is a power of two */
|
|
if ((bsize & (bsize - 1)) || nrbitsp) {
|
|
unsigned char nrbits;
|
|
|
|
for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
|
|
;
|
|
bsize = 1 << nrbits;
|
|
if (nrbitsp)
|
|
*nrbitsp = nrbits;
|
|
}
|
|
|
|
return bsize;
|
|
}
|
|
|
|
/*
|
|
* Calculate the number of 512byte blocks used.
|
|
*/
|
|
static inline blkcnt_t nfs_calc_block_size(u64 tsize)
|
|
{
|
|
blkcnt_t used = (tsize + 511) >> 9;
|
|
return (used > ULONG_MAX) ? ULONG_MAX : used;
|
|
}
|
|
|
|
/*
|
|
* Compute and set NFS server blocksize
|
|
*/
|
|
static inline
|
|
unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
|
|
{
|
|
if (bsize < NFS_MIN_FILE_IO_SIZE)
|
|
bsize = NFS_DEF_FILE_IO_SIZE;
|
|
else if (bsize >= NFS_MAX_FILE_IO_SIZE)
|
|
bsize = NFS_MAX_FILE_IO_SIZE;
|
|
|
|
return nfs_block_bits(bsize, nrbitsp);
|
|
}
|
|
|
|
/*
|
|
* Determine the maximum file size for a superblock
|
|
*/
|
|
static inline
|
|
void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
|
|
{
|
|
sb->s_maxbytes = (loff_t)maxfilesize;
|
|
if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
}
|
|
|
|
/*
|
|
* Determine the number of bytes of data the page contains
|
|
*/
|
|
static inline
|
|
unsigned int nfs_page_length(struct page *page)
|
|
{
|
|
loff_t i_size = i_size_read(page_file_mapping(page)->host);
|
|
|
|
if (i_size > 0) {
|
|
pgoff_t page_index = page_file_index(page);
|
|
pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
|
|
if (page_index < end_index)
|
|
return PAGE_CACHE_SIZE;
|
|
if (page_index == end_index)
|
|
return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Convert a umode to a dirent->d_type
|
|
*/
|
|
static inline
|
|
unsigned char nfs_umode_to_dtype(umode_t mode)
|
|
{
|
|
return (mode >> 12) & 15;
|
|
}
|
|
|
|
/*
|
|
* Determine the number of pages in an array of length 'len' and
|
|
* with a base offset of 'base'
|
|
*/
|
|
static inline
|
|
unsigned int nfs_page_array_len(unsigned int base, size_t len)
|
|
{
|
|
return ((unsigned long)len + (unsigned long)base +
|
|
PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
}
|
|
|
|
/*
|
|
* Convert a struct timespec into a 64-bit change attribute
|
|
*
|
|
* This does approximately the same thing as timespec_to_ns(),
|
|
* but for calculation efficiency, we multiply the seconds by
|
|
* 1024*1024*1024.
|
|
*/
|
|
static inline
|
|
u64 nfs_timespec_to_change_attr(const struct timespec *ts)
|
|
{
|
|
return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
|
|
}
|
|
|
|
#ifdef CONFIG_CRC32
|
|
/**
|
|
* nfs_fhandle_hash - calculate the crc32 hash for the filehandle
|
|
* @fh - pointer to filehandle
|
|
*
|
|
* returns a crc32 hash for the filehandle that is compatible with
|
|
* the one displayed by "wireshark".
|
|
*/
|
|
static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
|
|
{
|
|
return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
|
|
}
|
|
#else
|
|
static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|