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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /fs/nfs/internal.h | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nfs/internal.h')
-rw-r--r-- | fs/nfs/internal.h | 852 |
1 files changed, 852 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h new file mode 100644 index 000000000..a7e0970b5 --- /dev/null +++ b/fs/nfs/internal.h @@ -0,0 +1,852 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * NFS internal definitions + */ + +#include "nfs4_fs.h" +#include <linux/fs_context.h> +#include <linux/security.h> +#include <linux/crc32.h> +#include <linux/sunrpc/addr.h> +#include <linux/nfs_page.h> +#include <linux/wait_bit.h> + +#define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) + +extern const struct export_operations nfs_export_ops; + +struct nfs_string; +struct nfs_pageio_descriptor; + +static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) +{ + if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) + fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; +} + +static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) +{ + if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || + (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && + ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) + return 0; + return 1; +} + +static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry) +{ + if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL)) + return false; + if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size) + return false; + return true; +} + +static inline fmode_t flags_to_mode(int flags) +{ + fmode_t res = (__force fmode_t)flags & FMODE_EXEC; + if ((flags & O_ACCMODE) != O_WRONLY) + res |= FMODE_READ; + if ((flags & O_ACCMODE) != O_RDONLY) + res |= FMODE_WRITE; + return res; +} + +/* + * Note: RFC 1813 doesn't limit the number of auth flavors that + * a server can return, so make something up. + */ +#define NFS_MAX_SECFLAVORS (12) + +/* + * Value used if the user did not specify a port value. + */ +#define NFS_UNSPEC_PORT (-1) + +#define NFS_UNSPEC_RETRANS (UINT_MAX) +#define NFS_UNSPEC_TIMEO (UINT_MAX) + +/* + * Maximum number of pages that readdir can use for creating + * a vmapped array of pages. + */ +#define NFS_MAX_READDIR_PAGES 8 + +struct nfs_client_initdata { + unsigned long init_flags; + const char *hostname; /* Hostname of the server */ + const struct sockaddr *addr; /* Address of the server */ + const char *nodename; /* Hostname of the client */ + const char *ip_addr; /* IP address of the client */ + size_t addrlen; + struct nfs_subversion *nfs_mod; + int proto; + u32 minorversion; + unsigned int nconnect; + struct net *net; + const struct rpc_timeout *timeparms; + const struct cred *cred; +}; + +/* + * In-kernel mount arguments + */ +struct nfs_fs_context { + bool internal; + bool skip_reconfig_option_check; + bool need_mount; + bool sloppy; + unsigned int flags; /* NFS{,4}_MOUNT_* flags */ + unsigned int rsize, wsize; + unsigned int timeo, retrans; + unsigned int acregmin, acregmax; + unsigned int acdirmin, acdirmax; + unsigned int namlen; + unsigned int options; + unsigned int bsize; + struct nfs_auth_info auth_info; + rpc_authflavor_t selected_flavor; + char *client_address; + unsigned int version; + unsigned int minorversion; + char *fscache_uniq; + unsigned short protofamily; + unsigned short mountfamily; + + struct { + union { + struct sockaddr address; + struct sockaddr_storage _address; + }; + size_t addrlen; + char *hostname; + u32 version; + int port; + unsigned short protocol; + } mount_server; + + struct { + union { + struct sockaddr address; + struct sockaddr_storage _address; + }; + size_t addrlen; + char *hostname; + char *export_path; + int port; + unsigned short protocol; + unsigned short nconnect; + unsigned short export_path_len; + } nfs_server; + + struct nfs_fh *mntfh; + struct nfs_server *server; + struct nfs_subversion *nfs_mod; + + /* Information for a cloned mount. */ + struct nfs_clone_mount { + struct super_block *sb; + struct dentry *dentry; + struct nfs_fattr *fattr; + unsigned int inherited_bsize; + } clone_data; +}; + +#define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \ + errorf(fc, fmt, ## __VA_ARGS__) : \ + ({ dprintk(fmt "\n", ## __VA_ARGS__); })) + +#define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \ + errorf(fc, fmt, ## __VA_ARGS__) : \ + ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) + +#define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \ + invalf(fc, fmt, ## __VA_ARGS__) : \ + ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; })) + +#define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \ + invalf(fc, fmt, ## __VA_ARGS__) : \ + ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; })) + +#define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \ + warnf(fc, fmt, ## __VA_ARGS__) : \ + ({ dprintk(fmt "\n", ## __VA_ARGS__); })) + +#define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \ + warnf(fc, fmt, ## __VA_ARGS__) : \ + ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) + +static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) +{ + return fc->fs_private; +} + +/* mount_clnt.c */ +struct nfs_mount_request { + struct sockaddr *sap; + size_t salen; + char *hostname; + char *dirpath; + u32 version; + unsigned short protocol; + struct nfs_fh *fh; + int noresvport; + unsigned int *auth_flav_len; + rpc_authflavor_t *auth_flavs; + struct net *net; +}; + +extern int nfs_mount(struct nfs_mount_request *info); +extern void nfs_umount(const struct nfs_mount_request *info); + +/* client.c */ +extern const struct rpc_program nfs_program; +extern void nfs_clients_init(struct net *net); +extern void nfs_clients_exit(struct net *net); +extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); +int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); +struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); +int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); +void nfs_server_insert_lists(struct nfs_server *); +void nfs_server_remove_lists(struct nfs_server *); +void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); +int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, + rpc_authflavor_t); +struct nfs_server *nfs_alloc_server(void); +void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); + +extern void nfs_put_client(struct nfs_client *); +extern void nfs_free_client(struct nfs_client *); +extern struct nfs_client *nfs4_find_client_ident(struct net *, int); +extern struct nfs_client * +nfs4_find_client_sessionid(struct net *, const struct sockaddr *, + struct nfs4_sessionid *, u32); +extern struct nfs_server *nfs_create_server(struct fs_context *); +extern struct nfs_server *nfs4_create_server(struct fs_context *); +extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); +extern int nfs4_update_server(struct nfs_server *server, const char *hostname, + struct sockaddr *sap, size_t salen, + struct net *net); +extern void nfs_free_server(struct nfs_server *server); +extern struct nfs_server *nfs_clone_server(struct nfs_server *, + struct nfs_fh *, + struct nfs_fattr *, + rpc_authflavor_t); +extern bool nfs_client_init_is_complete(const struct nfs_client *clp); +extern int nfs_client_init_status(const struct nfs_client *clp); +extern int nfs_wait_client_init_complete(const struct nfs_client *clp); +extern void nfs_mark_client_ready(struct nfs_client *clp, int state); +extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, + const struct sockaddr *ds_addr, + int ds_addrlen, int ds_proto, + unsigned int ds_timeo, + unsigned int ds_retrans, + u32 minor_version); +extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, + struct inode *); +extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, + const struct sockaddr *ds_addr, int ds_addrlen, + int ds_proto, unsigned int ds_timeo, + unsigned int ds_retrans); +#ifdef CONFIG_PROC_FS +extern int __init nfs_fs_proc_init(void); +extern void nfs_fs_proc_exit(void); +extern int nfs_fs_proc_net_init(struct net *net); +extern void nfs_fs_proc_net_exit(struct net *net); +#else +static inline int nfs_fs_proc_net_init(struct net *net) +{ + return 0; +} +static inline void nfs_fs_proc_net_exit(struct net *net) +{ +} +static inline int nfs_fs_proc_init(void) +{ + return 0; +} +static inline void nfs_fs_proc_exit(void) +{ +} +#endif + +/* callback_xdr.c */ +extern const struct svc_version nfs4_callback_version1; +extern const struct svc_version nfs4_callback_version4; + +/* fs_context.c */ +extern struct file_system_type nfs_fs_type; + +/* pagelist.c */ +extern int __init nfs_init_nfspagecache(void); +extern void nfs_destroy_nfspagecache(void); +extern int __init nfs_init_readpagecache(void); +extern void nfs_destroy_readpagecache(void); +extern int __init nfs_init_writepagecache(void); +extern void nfs_destroy_writepagecache(void); + +extern int __init nfs_init_directcache(void); +extern void nfs_destroy_directcache(void); +extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, + struct nfs_pgio_header *hdr, + void (*release)(struct nfs_pgio_header *hdr)); +void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); +int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); + +extern const struct nfs_pageio_ops nfs_pgio_rw_ops; +struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); +void nfs_pgio_header_free(struct nfs_pgio_header *); +int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); +int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, + const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, + const struct rpc_call_ops *call_ops, int how, int flags); +void nfs_free_request(struct nfs_page *req); +struct nfs_pgio_mirror * +nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); + +static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, + const struct nfs_open_context *ctx2) +{ + return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; +} + +/* nfs2xdr.c */ +extern const struct rpc_procinfo nfs_procedures[]; +extern int nfs2_decode_dirent(struct xdr_stream *, + struct nfs_entry *, bool); + +/* nfs3xdr.c */ +extern const struct rpc_procinfo nfs3_procedures[]; +extern int nfs3_decode_dirent(struct xdr_stream *, + struct nfs_entry *, bool); + +/* nfs4xdr.c */ +#if IS_ENABLED(CONFIG_NFS_V4) +extern int nfs4_decode_dirent(struct xdr_stream *, + struct nfs_entry *, bool); +#endif +#ifdef CONFIG_NFS_V4_1 +extern const u32 nfs41_maxread_overhead; +extern const u32 nfs41_maxwrite_overhead; +extern const u32 nfs41_maxgetdevinfo_overhead; +#endif + +/* nfs4proc.c */ +#if IS_ENABLED(CONFIG_NFS_V4) +extern const struct rpc_procinfo nfs4_procedures[]; +#endif + +#ifdef CONFIG_NFS_V4_SECURITY_LABEL +extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); +static inline struct nfs4_label * +nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) +{ + if (!dst || !src) + return NULL; + + if (src->len > NFS4_MAXLABELLEN) + return NULL; + + dst->lfs = src->lfs; + dst->pi = src->pi; + dst->len = src->len; + memcpy(dst->label, src->label, src->len); + + return dst; +} +static inline void nfs4_label_free(struct nfs4_label *label) +{ + if (label) { + kfree(label->label); + kfree(label); + } + return; +} + +static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) +{ + if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) + nfsi->cache_validity |= NFS_INO_INVALID_LABEL; +} +#else +static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } +static inline void nfs4_label_free(void *label) {} +static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) +{ +} +static inline struct nfs4_label * +nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) +{ + return NULL; +} +#endif /* CONFIG_NFS_V4_SECURITY_LABEL */ + +/* proc.c */ +void nfs_close_context(struct nfs_open_context *ctx, int is_sync); +extern struct nfs_client *nfs_init_client(struct nfs_client *clp, + const struct nfs_client_initdata *); + +/* dir.c */ +extern void nfs_advise_use_readdirplus(struct inode *dir); +extern void nfs_force_use_readdirplus(struct inode *dir); +extern unsigned long nfs_access_cache_count(struct shrinker *shrink, + struct shrink_control *sc); +extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, + struct shrink_control *sc); +struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); +int nfs_create(struct inode *, struct dentry *, umode_t, bool); +int nfs_mkdir(struct inode *, struct dentry *, umode_t); +int nfs_rmdir(struct inode *, struct dentry *); +int nfs_unlink(struct inode *, struct dentry *); +int nfs_symlink(struct inode *, struct dentry *, const char *); +int nfs_link(struct dentry *, struct inode *, struct dentry *); +int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); +int nfs_rename(struct inode *, struct dentry *, + struct inode *, struct dentry *, unsigned int); + +/* file.c */ +int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); +loff_t nfs_file_llseek(struct file *, loff_t, int); +ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); +int nfs_file_mmap(struct file *, struct vm_area_struct *); +ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); +int nfs_file_release(struct inode *, struct file *); +int nfs_lock(struct file *, int, struct file_lock *); +int nfs_flock(struct file *, int, struct file_lock *); +int nfs_check_flags(int); + +/* inode.c */ +extern struct workqueue_struct *nfsiod_workqueue; +extern struct inode *nfs_alloc_inode(struct super_block *sb); +extern void nfs_free_inode(struct inode *); +extern int nfs_write_inode(struct inode *, struct writeback_control *); +extern int nfs_drop_inode(struct inode *); +extern void nfs_clear_inode(struct inode *); +extern void nfs_evict_inode(struct inode *); +void nfs_zap_acl_cache(struct inode *inode); +extern bool nfs_check_cache_invalid(struct inode *, unsigned long); +extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); +extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); + +/* super.c */ +extern const struct super_operations nfs_sops; +bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); +int nfs_try_get_tree(struct fs_context *); +int nfs_get_tree_common(struct fs_context *); +void nfs_kill_super(struct super_block *); + +extern struct rpc_stat nfs_rpcstat; + +extern int __init register_nfs_fs(void); +extern void __exit unregister_nfs_fs(void); +extern bool nfs_sb_active(struct super_block *sb); +extern void nfs_sb_deactive(struct super_block *sb); +extern int nfs_client_for_each_server(struct nfs_client *clp, + int (*fn)(struct nfs_server *, void *), + void *data); +/* io.c */ +extern void nfs_start_io_read(struct inode *inode); +extern void nfs_end_io_read(struct inode *inode); +extern void nfs_start_io_write(struct inode *inode); +extern void nfs_end_io_write(struct inode *inode); +extern void nfs_start_io_direct(struct inode *inode); +extern void nfs_end_io_direct(struct inode *inode); + +static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) +{ + return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; +} + +/* namespace.c */ +#define NFS_PATH_CANONICAL 1 +extern char *nfs_path(char **p, struct dentry *dentry, + char *buffer, ssize_t buflen, unsigned flags); +extern struct vfsmount *nfs_d_automount(struct path *path); +int nfs_submount(struct fs_context *, struct nfs_server *); +int nfs_do_submount(struct fs_context *); + +/* getroot.c */ +extern int nfs_get_root(struct super_block *s, struct fs_context *fc); +#if IS_ENABLED(CONFIG_NFS_V4) +extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); +#endif + +struct nfs_pgio_completion_ops; +/* read.c */ +extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, + struct inode *inode, bool force_mds, + const struct nfs_pgio_completion_ops *compl_ops); +extern void nfs_read_prepare(struct rpc_task *task, void *calldata); +extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); + +/* super.c */ +void nfs_umount_begin(struct super_block *); +int nfs_statfs(struct dentry *, struct kstatfs *); +int nfs_show_options(struct seq_file *, struct dentry *); +int nfs_show_devname(struct seq_file *, struct dentry *); +int nfs_show_path(struct seq_file *, struct dentry *); +int nfs_show_stats(struct seq_file *, struct dentry *); +int nfs_reconfigure(struct fs_context *); + +/* write.c */ +extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, + struct inode *inode, int ioflags, bool force_mds, + const struct nfs_pgio_completion_ops *compl_ops); +extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); +extern void nfs_commit_free(struct nfs_commit_data *p); +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 nfs_rpc_ops *nfs_ops, + 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); +unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); +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, + u32 ds_commit_idx); +int nfs_write_need_commit(struct nfs_pgio_header *); +void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); +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, + u32 ds_commit_idx); +void nfs_commitdata_release(struct nfs_commit_data *data); +void nfs_request_add_commit_list(struct nfs_page *req, + struct nfs_commit_info *cinfo); +void nfs_request_add_commit_list_locked(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, struct inode *inode); +void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); + +int nfs_filemap_write_and_wait_range(struct address_space *mapping, + loff_t lstart, loff_t lend); + +#ifdef CONFIG_NFS_V4_1 +static inline void +pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, + unsigned int nbuckets) +{ + unsigned int i; + + for (i = 0; i < nbuckets; i++) + buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; +} +static inline +void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) +{ + struct pnfs_commit_array *array; + + rcu_read_lock(); + list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) + pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, + array->nbuckets); + rcu_read_unlock(); +} +#else +static inline +void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) +{ +} +#endif + +#ifdef CONFIG_MIGRATION +extern int nfs_migrate_page(struct address_space *, + struct page *, struct page *, enum migrate_mode); +#endif + +static inline int +nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, + const struct nfs_write_verifier *v2) +{ + return memcmp(v1->data, v2->data, sizeof(v1->data)); +} + +static inline bool +nfs_write_match_verf(const struct nfs_writeverf *verf, + struct nfs_page *req) +{ + return verf->committed > NFS_UNSTABLE && + !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); +} + +static inline gfp_t nfs_io_gfp_mask(void) +{ + if (current->flags & PF_WQ_WORKER) + return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; + return GFP_KERNEL; +} + +/* 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); +extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); + +/* nfs4proc.c */ +extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, + const struct nfs_client_initdata *); +extern int nfs40_walk_client_list(struct nfs_client *clp, + struct nfs_client **result, + const struct cred *cred); +extern int nfs41_walk_client_list(struct nfs_client *clp, + struct nfs_client **result, + const struct cred *cred); +extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, + struct rpc_xprt *xprt, + void *data); + +static inline struct inode *nfs_igrab_and_active(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + + if (sb && nfs_sb_active(sb)) { + if (igrab(inode)) + return inode; + nfs_sb_deactive(sb); + } + return NULL; +} + +static inline void nfs_iput_and_deactive(struct inode *inode) +{ + if (inode != NULL) { + struct super_block *sb = inode->i_sb; + + iput(inode); + nfs_sb_deactive(sb); + } +} + +/* + * 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; +} + +/* + * Record the page as unstable (an extra writeback period) and mark its + * inode as dirty. + */ +static inline +void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) +{ + if (!cinfo->dreq) { + struct inode *inode = page_file_mapping(page)->host; + + /* This page is really still in write-back - just that the + * writeback is happening on the server now. + */ + inc_node_page_state(page, NR_WRITEBACK); + inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); + __mark_inode_dirty(inode, I_DIRTY_DATASYNC); + } +} + +/* + * 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 index = page_index(page); + pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; + if (index < end_index) + return PAGE_SIZE; + if (index == end_index) + return ((i_size - 1) & ~PAGE_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 timespec64 into a 64-bit change attribute + * + * This does approximately the same thing as timespec64_to_ns(), + * but for calculation efficiency, we multiply the seconds by + * 1024*1024*1024. + */ +static inline +u64 nfs_timespec_to_change_attr(const struct timespec64 *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); +} +static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) +{ + return ~crc32_le(0xFFFFFFFF, &stateid->other[0], + NFS4_STATEID_OTHER_SIZE); +} +#else +static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) +{ + return 0; +} +static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) +{ + return 0; +} +#endif + +static inline bool nfs_error_is_fatal(int err) +{ + switch (err) { + case -ERESTARTSYS: + case -EINTR: + case -EACCES: + case -EDQUOT: + case -EFBIG: + case -EIO: + case -ENOSPC: + case -EROFS: + case -ESTALE: + case -E2BIG: + case -ENOMEM: + case -ETIMEDOUT: + return true; + default: + return false; + } +} + +static inline bool nfs_error_is_fatal_on_server(int err) +{ + switch (err) { + case 0: + case -ERESTARTSYS: + case -EINTR: + case -ENOMEM: + return false; + } + return nfs_error_is_fatal(err); +} + +/* + * Select between a default port value and a user-specified port value. + * If a zero value is set, then autobind will be used. + */ +static inline void nfs_set_port(struct sockaddr *sap, int *port, + const unsigned short default_port) +{ + if (*port == NFS_UNSPEC_PORT) + *port = default_port; + + rpc_set_port(sap, *port); +} |