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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <uapi/linux/nfs_fs.h>
/* * Enable dprintk() debugging support for nfs client. */#ifdef CONFIG_NFS_DEBUG# define NFS_DEBUG#endif
#include <linux/in.h>#include <linux/mm.h>#include <linux/pagemap.h>#include <linux/rbtree.h>#include <linux/refcount.h>#include <linux/rwsem.h>#include <linux/wait.h>
#include <linux/sunrpc/debug.h>#include <linux/sunrpc/auth.h>#include <linux/sunrpc/clnt.h>
#ifdef CONFIG_NFS_FSCACHE#include <linux/netfs.h>#endif
#include <linux/nfs.h>#include <linux/nfs2.h>#include <linux/nfs3.h>#include <linux/nfs4.h>#include <linux/nfs_xdr.h>#include <linux/nfs_fs_sb.h>
#include <linux/mempool.h>
/* * These are the default for number of transports to different server IPs */#define NFS_MAX_TRANSPORTS 16
/* * Size of the NFS directory verifier */#define NFS_DIR_VERIFIER_SIZE 2
/* * NFSv3/v4 Access mode cache entry */struct nfs_access_entry { struct rb_node rb_node; struct list_head lru; kuid_t fsuid; kgid_t fsgid; struct group_info *group_info; u64 timestamp; __u32 mask; struct rcu_head rcu_head;};
struct nfs_lock_context { refcount_t count; struct list_head list; struct nfs_open_context *open_context; fl_owner_t lockowner; atomic_t io_count; struct rcu_head rcu_head;};
struct nfs_file_localio { struct nfsd_file __rcu *ro_file; struct nfsd_file __rcu *rw_file; struct list_head list; void __rcu *nfs_uuid; /* opaque pointer to 'nfs_uuid_t' */};
static inline void nfs_localio_file_init(struct nfs_file_localio *nfl){#if IS_ENABLED(CONFIG_NFS_LOCALIO) nfl->ro_file = NULL; nfl->rw_file = NULL; INIT_LIST_HEAD(&nfl->list); nfl->nfs_uuid = NULL;#endif}
struct nfs4_state;struct nfs_open_context { struct nfs_lock_context lock_context; fl_owner_t flock_owner; struct dentry *dentry; const struct cred *cred; struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */ struct nfs4_state *state; fmode_t mode;
int error; unsigned long flags;#define NFS_CONTEXT_BAD (2)#define NFS_CONTEXT_UNLOCK (3)#define NFS_CONTEXT_FILE_OPEN (4)#define NFS_CONTEXT_WRITE_SYNC (5)#define NFS_CONTEXT_O_DIRECT (6)
struct nfs4_threshold *mdsthreshold; struct list_head list; struct rcu_head rcu_head; struct nfs_file_localio nfl;};
struct nfs_open_dir_context { struct list_head list; atomic_t cache_hits; atomic_t cache_misses; unsigned long attr_gencount; __be32 verf[NFS_DIR_VERIFIER_SIZE]; __u64 dir_cookie; __u64 last_cookie; pgoff_t page_index; unsigned int dtsize; bool force_clear; bool eof; struct rcu_head rcu_head;};
/* * NFSv4 delegation */struct nfs_delegation;
struct posix_acl;
struct nfs4_xattr_cache;
/* * nfs fs inode data in memory */struct nfs_inode { /* * NFS file handle */ struct nfs_fh fh;
/* * Various flags */ unsigned long flags; /* atomic bit ops */ unsigned long cache_validity; /* bit mask */
/* * NFS Attributes not included in struct inode */
struct timespec64 btime;
bool uncacheable_file_data : 1;
/* * read_cache_jiffies is when we started read-caching this inode. * attrtimeo is for how long the cached information is assumed * to be valid. A successful attribute revalidation doubles * attrtimeo (up to acregmax/acdirmax), a failure resets it to * acregmin/acdirmin. * * We need to revalidate the cached attrs for this inode if * * jiffies - read_cache_jiffies >= attrtimeo * * Please note the comparison is greater than or equal * so that zero timeout values can be specified. */ unsigned long read_cache_jiffies; unsigned long attrtimeo; unsigned long attrtimeo_timestamp;
unsigned long attr_gencount;
struct rb_root access_cache; struct list_head access_cache_entry_lru; struct list_head access_cache_inode_lru;
union { /* Directory */ struct { /* "Generation counter" for the attribute cache. * This is bumped whenever we update the metadata * on the server. */ unsigned long cache_change_attribute; /* * This is the cookie verifier used for NFSv3 readdir * operations */ __be32 cookieverf[NFS_DIR_VERIFIER_SIZE]; /* Readers: in-flight sillydelete RPC calls */ /* Writers: rmdir */ struct rw_semaphore rmdir_sem; }; /* Regular file */ struct { atomic_long_t nrequests; atomic_long_t redirtied_pages; struct nfs_mds_commit_info commit_info; struct mutex commit_mutex; }; };
/* Open contexts for shared mmap writes */ struct list_head open_files;
/* Keep track of out-of-order replies. * The ooo array contains start/end pairs of * numbers from the changeid sequence when * the inode's iversion has been updated. * It also contains end/start pair (i.e. reverse order) * of sections of the changeid sequence that have * been seen in replies from the server. * Normally these should match and when both * A:B and B:A are found in ooo, they are both removed. * And if a reply with A:B causes an iversion update * of A:B, then neither are added. * When a reply has pre_change that doesn't match * iversion, then the changeid pair and any consequent * change in iversion ARE added. Later replies * might fill in the gaps, or possibly a gap is caused * by a change from another client. * When a file or directory is opened, if the ooo table * is not empty, then we assume the gaps were due to * another client and we invalidate the cached data. * * We can only track a limited number of concurrent gaps. * Currently that limit is 16. * We allocate the table on demand. If there is insufficient * memory, then we probably cannot cache the file anyway * so there is no loss. */ struct { int cnt; struct { u64 start, end; } gap[16]; } *ooo;
#if IS_ENABLED(CONFIG_NFS_V4) struct nfs4_cached_acl *nfs4_acl; /* NFSv4 state */ struct list_head open_states; struct nfs_delegation __rcu *delegation; struct rw_semaphore rwsem;
/* pNFS layout information */ struct pnfs_layout_hdr *layout;#endif /* CONFIG_NFS_V4*/ /* how many bytes have been written/read and how many bytes queued up */ __u64 write_io; __u64 read_io;#ifdef CONFIG_NFS_V4_2 struct nfs4_xattr_cache *xattr_cache;#endif union { struct inode vfs_inode;#ifdef CONFIG_NFS_FSCACHE struct netfs_inode netfs; /* netfs context and VFS inode */#endif };};
struct nfs4_copy_state { struct list_head copies; struct list_head src_copies; nfs4_stateid stateid; struct completion completion; uint64_t count; struct nfs_writeverf verf; int error; int flags; struct nfs4_state *parent_src_state; struct nfs4_state *parent_dst_state;};
/* * Access bit flags */#define NFS_ACCESS_READ 0x0001#define NFS_ACCESS_LOOKUP 0x0002#define NFS_ACCESS_MODIFY 0x0004#define NFS_ACCESS_EXTEND 0x0008#define NFS_ACCESS_DELETE 0x0010#define NFS_ACCESS_EXECUTE 0x0020#define NFS_ACCESS_XAREAD 0x0040#define NFS_ACCESS_XAWRITE 0x0080#define NFS_ACCESS_XALIST 0x0100
/* * Cache validity bit flags */#define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */#define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */#define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */#define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */#define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */#define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */#define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */#define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */#define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */#define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */#define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */#define NFS_INO_DATA_INVAL_DEFER \ BIT(13) /* Deferred cache invalidation */#define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */#define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */#define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */#define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */#define NFS_INO_INVALID_BTIME BIT(18) /* cached btime is invalid */#define NFS_INO_INVALID_UNCACHEABLE_FILE_DATA BIT(19) /* cached uncacheable_file_data is invalid */
#define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \ | NFS_INO_INVALID_CTIME \ | NFS_INO_INVALID_MTIME \ | NFS_INO_INVALID_BTIME \ | NFS_INO_INVALID_SIZE \ | NFS_INO_INVALID_NLINK \ | NFS_INO_INVALID_MODE \ | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
/* * Bit offsets in flags field */#define NFS_INO_STALE (1) /* possible stale inode */#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */#define NFS_INO_INVALIDATING (3) /* inode is being invalidated */#define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */#define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */#define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */#define NFS_INO_REQ_DIR_DELEG (13) /* Request a directory delegation */
static inline struct nfs_inode *NFS_I(const struct inode *inode){ return container_of(inode, struct nfs_inode, vfs_inode);}
static inline struct nfs_server *NFS_SB(const struct super_block *s){ return (struct nfs_server *)(s->s_fs_info);}
static inline struct nfs_fh *NFS_FH(const struct inode *inode){ return &NFS_I(inode)->fh;}
static inline struct nfs_server *NFS_SERVER(const struct inode *inode){ return NFS_SB(inode->i_sb);}
static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode){ return NFS_SERVER(inode)->client;}
static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode){ return NFS_SERVER(inode)->nfs_client->rpc_ops;}
static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode){ struct nfs_server *nfss = NFS_SERVER(inode); return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;}
static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode){ struct nfs_server *nfss = NFS_SERVER(inode); return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;}
static inline int NFS_STALE(const struct inode *inode){ return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);}
static inline void nfs_mark_for_revalidate(struct inode *inode){ struct nfs_inode *nfsi = NFS_I(inode);
spin_lock(&inode->i_lock); nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | NFS_INO_INVALID_SIZE; if (S_ISDIR(inode->i_mode)) nfsi->cache_validity |= NFS_INO_INVALID_DATA; spin_unlock(&inode->i_lock);}
static inline int nfs_server_capable(const struct inode *inode, int cap){ return NFS_SERVER(inode)->caps & cap;}
/** * nfs_save_change_attribute - Returns the inode attribute change cookie * @dir - pointer to parent directory inode * The "cache change attribute" is updated when we need to revalidate * our dentry cache after a directory was seen to change on the server. */static inline unsigned long nfs_save_change_attribute(struct inode *dir){ return NFS_I(dir)->cache_change_attribute;}
/* * linux/fs/nfs/inode.c */extern int nfs_sync_mapping(struct address_space *mapping);extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);extern void nfs_zap_caches(struct inode *);extern void nfs_set_inode_stale(struct inode *inode);extern void nfs_invalidate_atime(struct inode *);extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, struct nfs_fattr *);struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);extern int nfs_getattr(const struct mnt_idmap *, const struct path *, struct kstat *, u32, unsigned int);extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);extern void nfs_access_set_mask(struct nfs_access_entry *, u32);extern int nfs_permission(const struct mnt_idmap *, struct inode *, int);extern int nfs_open(struct inode *, struct file *);extern int nfs_attribute_cache_expired(struct inode *inode);extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);extern int nfs_clear_invalid_mapping(struct address_space *mapping);extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);extern int nfs_revalidate_mapping_rcu(struct inode *inode);extern int nfs_setattr(const struct mnt_idmap *, struct dentry *, struct iattr *);extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);extern void put_nfs_open_context(struct nfs_open_context *ctx);extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);extern void nfs_file_clear_open_context(struct file *flip);extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);extern void nfs_fattr_init(struct nfs_fattr *fattr);extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);extern unsigned long nfs_inc_attr_generation_counter(void);
extern struct nfs_fattr *nfs_alloc_fattr(void);extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
static inline void nfs4_label_free(struct nfs4_label *label){#ifdef CONFIG_NFS_V4_SECURITY_LABEL if (label) { kfree(label->label); kfree(label); }#endif}
static inline void nfs_free_fattr(const struct nfs_fattr *fattr){ if (fattr) nfs4_label_free(fattr->label); kfree(fattr);}
extern struct nfs_fh *nfs_alloc_fhandle(void);
static inline void nfs_free_fhandle(const struct nfs_fh *fh){ kfree(fh);}
#ifdef NFS_DEBUGextern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh){ return _nfs_display_fhandle_hash(fh);}extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);#define nfs_display_fhandle(fh, caption) \ do { \ if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ _nfs_display_fhandle(fh, caption); \ } while (0)#elsestatic inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh){ return 0;}static inline void nfs_display_fhandle(const struct nfs_fh *fh, const char *caption){}#endif
/* * linux/fs/nfs/nfsroot.c */extern int nfs_root_data(char **root_device, char **root_data); /*__init*//* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */extern __be32 root_nfs_parse_addr(char *name); /*__init*/
/* * linux/fs/nfs/file.c */extern const struct file_operations nfs_file_operations;#if IS_ENABLED(CONFIG_NFS_V4)extern const struct file_operations nfs4_file_operations;#endif /* CONFIG_NFS_V4 */extern const struct address_space_operations nfs_file_aops;extern const struct address_space_operations nfs_dir_aops;
static inline struct nfs_open_context *nfs_file_open_context(struct file *filp){ return filp->private_data;}
static inline const struct cred *nfs_file_cred(struct file *file){ if (file != NULL) { struct nfs_open_context *ctx = nfs_file_open_context(file); if (ctx) return ctx->cred; } return NULL;}
/* * linux/fs/nfs/direct.c */ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter, bool swap);ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter, bool swap);
/* * linux/fs/nfs/dir.c */extern const struct file_operations nfs_dir_operations;extern const struct dentry_operations nfs_dentry_operations;
extern void nfs_force_lookup_revalidate(struct inode *dir);extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);#if IS_ENABLED(CONFIG_NFS_V4)extern void nfs_clear_verifier_delegated(struct inode *inode);#endif /* IS_ENABLED(CONFIG_NFS_V4) */extern struct dentry *nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);extern void nfs_access_zap_cache(struct inode *inode);extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, u32 *mask, bool may_block);extern int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry, struct file *file, unsigned int open_flags, umode_t mode);
/* * linux/fs/nfs/symlink.c */extern const struct inode_operations nfs_symlink_inode_operations;
/* * linux/fs/nfs/sysctl.c */#ifdef CONFIG_SYSCTLextern int nfs_register_sysctl(void);extern void nfs_unregister_sysctl(void);#else#define nfs_register_sysctl() 0#define nfs_unregister_sysctl() do { } while(0)#endif
/* * linux/fs/nfs/namespace.c */extern const struct inode_operations nfs_mountpoint_inode_operations;extern const struct inode_operations nfs_referral_inode_operations;extern int nfs_mountpoint_expiry_timeout;extern void nfs_release_automount_timer(void);
/* * linux/fs/nfs/unlink.c */extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
/* * linux/fs/nfs/write.c */extern int nfs_congestion_kb;extern int nfs_writepages(struct address_space *, struct writeback_control *);extern int nfs_flush_incompatible(struct file *file, struct folio *folio);extern int nfs_update_folio(struct file *file, struct folio *folio, unsigned int offset, unsigned int count);
/* * Try to write back everything synchronously (but check the * return value!) */extern int nfs_sync_inode(struct inode *inode);extern int nfs_wb_all(struct inode *inode);extern int nfs_wb_folio(struct inode *inode, struct folio *folio);extern int nfs_wb_folio_reclaim(struct inode *inode, struct folio *folio);int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);extern int nfs_commit_inode(struct inode *, int);extern struct nfs_commit_data *nfs_commitdata_alloc(void);extern void nfs_commit_free(struct nfs_commit_data *data);void nfs_commit_begin(struct nfs_mds_commit_info *cinfo);bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
static inline bool nfs_have_writebacks(const struct inode *inode){ if (S_ISREG(inode->i_mode)) return atomic_long_read(&NFS_I(inode)->nrequests) != 0; return false;}
/* * linux/fs/nfs/read.c */int nfs_read_folio(struct file *, struct folio *);void nfs_readahead(struct readahead_control *);
/* * inline functions */
static inline loff_t nfs_size_to_loff_t(__u64 size){ return min_t(u64, size, OFFSET_MAX);}
static inline void nfs_ooo_clear(struct nfs_inode *nfsi){ nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER; kfree(nfsi->ooo); nfsi->ooo = NULL;}
static inline bool nfs_ooo_test(struct nfs_inode *nfsi){ return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) || (nfsi->ooo && nfsi->ooo->cnt > 0);
}
#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
/* We need to block new opens while a file is being unlinked. * If it is opened *before* we decide to unlink, we will silly-rename * instead. If it is opened *after*, then we need to create or will fail. * If we allow the two to race, we could end up with a file that is open * but deleted on the server resulting in ESTALE. * So use ->d_fsdata to record when the unlink is happening * and block dentry revalidation while it is set. */#define NFS_FSDATA_BLOCKED ((void*)1)
# undef ifdebug# ifdef NFS_DEBUG# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))# define NFS_IFDEBUG(x) x# else# define ifdebug(fac) if (0)# define NFS_IFDEBUG(x)# endif#endif