1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* Network filesystem support services. 3 * 4 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 * 7 * See: 8 * 9 * Documentation/filesystems/netfs_library.rst 10 * 11 * for a description of the network filesystem interface declared here. 12 */ 13 14#ifndef _LINUX_NETFS_H 15#define _LINUX_NETFS_H 16 17#include <linux/workqueue.h> 18#include <linux/fs.h> 19#include <linux/pagemap.h> 20#include <linux/uio.h> 21 22enum netfs_sreq_ref_trace; 23typedef struct mempool_s mempool_t; 24 25/** 26 * folio_start_private_2 - Start an fscache write on a folio. [DEPRECATED] 27 * @folio: The folio. 28 * 29 * Call this function before writing a folio to a local cache. Starting a 30 * second write before the first one finishes is not allowed. 31 * 32 * Note that this should no longer be used. 33 */ 34static inline void folio_start_private_2(struct folio *folio) 35{ 36 VM_BUG_ON_FOLIO(folio_test_private_2(folio), folio); 37 folio_get(folio); 38 folio_set_private_2(folio); 39} 40 41/* Marks used on xarray-based buffers */ 42#define NETFS_BUF_PUT_MARK XA_MARK_0 /* - Page needs putting */ 43#define NETFS_BUF_PAGECACHE_MARK XA_MARK_1 /* - Page needs wb/dirty flag wrangling */ 44 45enum netfs_io_source { 46 NETFS_FILL_WITH_ZEROES, 47 NETFS_DOWNLOAD_FROM_SERVER, 48 NETFS_READ_FROM_CACHE, 49 NETFS_INVALID_READ, 50 NETFS_UPLOAD_TO_SERVER, 51 NETFS_WRITE_TO_CACHE, 52 NETFS_INVALID_WRITE, 53} __mode(byte); 54 55typedef void (*netfs_io_terminated_t)(void *priv, ssize_t transferred_or_error, 56 bool was_async); 57 58/* 59 * Per-inode context. This wraps the VFS inode. 60 */ 61struct netfs_inode { 62 struct inode inode; /* The VFS inode */ 63 const struct netfs_request_ops *ops; 64#if IS_ENABLED(CONFIG_FSCACHE) 65 struct fscache_cookie *cache; 66#endif 67 struct mutex wb_lock; /* Writeback serialisation */ 68 loff_t remote_i_size; /* Size of the remote file */ 69 loff_t zero_point; /* Size after which we assume there's no data 70 * on the server */ 71 atomic_t io_count; /* Number of outstanding reqs */ 72 unsigned long flags; 73#define NETFS_ICTX_ODIRECT 0 /* The file has DIO in progress */ 74#define NETFS_ICTX_UNBUFFERED 1 /* I/O should not use the pagecache */ 75#define NETFS_ICTX_WRITETHROUGH 2 /* Write-through caching */ 76#define NETFS_ICTX_USE_PGPRIV2 31 /* [DEPRECATED] Use PG_private_2 to mark 77 * write to cache on read */ 78}; 79 80/* 81 * A netfs group - for instance a ceph snap. This is marked on dirty pages and 82 * pages marked with a group must be flushed before they can be written under 83 * the domain of another group. 84 */ 85struct netfs_group { 86 refcount_t ref; 87 void (*free)(struct netfs_group *netfs_group); 88}; 89 90/* 91 * Information about a dirty page (attached only if necessary). 92 * folio->private 93 */ 94struct netfs_folio { 95 struct netfs_group *netfs_group; /* Filesystem's grouping marker (or NULL). */ 96 unsigned int dirty_offset; /* Write-streaming dirty data offset */ 97 unsigned int dirty_len; /* Write-streaming dirty data length */ 98}; 99#define NETFS_FOLIO_INFO 0x1UL /* OR'd with folio->private. */ 100#define NETFS_FOLIO_COPY_TO_CACHE ((struct netfs_group *)0x356UL) /* Write to the cache only */ 101 102static inline bool netfs_is_folio_info(const void *priv) 103{ 104 return (unsigned long)priv & NETFS_FOLIO_INFO; 105} 106 107static inline struct netfs_folio *__netfs_folio_info(const void *priv) 108{ 109 if (netfs_is_folio_info(priv)) 110 return (struct netfs_folio *)((unsigned long)priv & ~NETFS_FOLIO_INFO); 111 return NULL; 112} 113 114static inline struct netfs_folio *netfs_folio_info(struct folio *folio) 115{ 116 return __netfs_folio_info(folio_get_private(folio)); 117} 118 119static inline struct netfs_group *netfs_folio_group(struct folio *folio) 120{ 121 struct netfs_folio *finfo; 122 void *priv = folio_get_private(folio); 123 124 finfo = netfs_folio_info(folio); 125 if (finfo) 126 return finfo->netfs_group; 127 return priv; 128} 129 130/* 131 * Stream of I/O subrequests going to a particular destination, such as the 132 * server or the local cache. This is mainly intended for writing where we may 133 * have to write to multiple destinations concurrently. 134 */ 135struct netfs_io_stream { 136 /* Submission tracking */ 137 struct netfs_io_subrequest *construct; /* Op being constructed */ 138 unsigned int submit_off; /* Folio offset we're submitting from */ 139 unsigned int submit_len; /* Amount of data left to submit */ 140 unsigned int submit_max_len; /* Amount I/O can be rounded up to */ 141 void (*prepare_write)(struct netfs_io_subrequest *subreq); 142 void (*issue_write)(struct netfs_io_subrequest *subreq); 143 /* Collection tracking */ 144 struct list_head subrequests; /* Contributory I/O operations */ 145 struct netfs_io_subrequest *front; /* Op being collected */ 146 unsigned long long collected_to; /* Position we've collected results to */ 147 size_t transferred; /* The amount transferred from this stream */ 148 enum netfs_io_source source; /* Where to read from/write to */ 149 unsigned short error; /* Aggregate error for the stream */ 150 unsigned char stream_nr; /* Index of stream in parent table */ 151 bool avail; /* T if stream is available */ 152 bool active; /* T if stream is active */ 153 bool need_retry; /* T if this stream needs retrying */ 154 bool failed; /* T if this stream failed */ 155}; 156 157/* 158 * Resources required to do operations on a cache. 159 */ 160struct netfs_cache_resources { 161 const struct netfs_cache_ops *ops; 162 void *cache_priv; 163 void *cache_priv2; 164 unsigned int debug_id; /* Cookie debug ID */ 165 unsigned int inval_counter; /* object->inval_counter at begin_op */ 166}; 167 168/* 169 * Descriptor for a single component subrequest. Each operation represents an 170 * individual read/write from/to a server, a cache, a journal, etc.. 171 * 172 * The buffer iterator is persistent for the life of the subrequest struct and 173 * the pages it points to can be relied on to exist for the duration. 174 */ 175struct netfs_io_subrequest { 176 struct netfs_io_request *rreq; /* Supervising I/O request */ 177 struct work_struct work; 178 struct list_head rreq_link; /* Link in rreq->subrequests */ 179 struct iov_iter io_iter; /* Iterator for this subrequest */ 180 unsigned long long start; /* Where to start the I/O */ 181 size_t max_len; /* Maximum size of the I/O */ 182 size_t len; /* Size of the I/O */ 183 size_t transferred; /* Amount of data transferred */ 184 refcount_t ref; 185 short error; /* 0 or error that occurred */ 186 unsigned short debug_index; /* Index in list (for debugging output) */ 187 unsigned int nr_segs; /* Number of segs in io_iter */ 188 unsigned int max_nr_segs; /* 0 or max number of segments in an iterator */ 189 enum netfs_io_source source; /* Where to read from/write to */ 190 unsigned char stream_nr; /* I/O stream this belongs to */ 191 unsigned long flags; 192#define NETFS_SREQ_COPY_TO_CACHE 0 /* Set if should copy the data to the cache */ 193#define NETFS_SREQ_CLEAR_TAIL 1 /* Set if the rest of the read should be cleared */ 194#define NETFS_SREQ_SHORT_IO 2 /* Set if the I/O was short */ 195#define NETFS_SREQ_SEEK_DATA_READ 3 /* Set if ->read() should SEEK_DATA first */ 196#define NETFS_SREQ_NO_PROGRESS 4 /* Set if we didn't manage to read any data */ 197#define NETFS_SREQ_ONDEMAND 5 /* Set if it's from on-demand read mode */ 198#define NETFS_SREQ_BOUNDARY 6 /* Set if ends on hard boundary (eg. ceph object) */ 199#define NETFS_SREQ_IN_PROGRESS 8 /* Unlocked when the subrequest completes */ 200#define NETFS_SREQ_NEED_RETRY 9 /* Set if the filesystem requests a retry */ 201#define NETFS_SREQ_RETRYING 10 /* Set if we're retrying */ 202#define NETFS_SREQ_FAILED 11 /* Set if the subreq failed unretryably */ 203}; 204 205enum netfs_io_origin { 206 NETFS_READAHEAD, /* This read was triggered by readahead */ 207 NETFS_READPAGE, /* This read is a synchronous read */ 208 NETFS_READ_FOR_WRITE, /* This read is to prepare a write */ 209 NETFS_COPY_TO_CACHE, /* This write is to copy a read to the cache */ 210 NETFS_WRITEBACK, /* This write was triggered by writepages */ 211 NETFS_WRITETHROUGH, /* This write was made by netfs_perform_write() */ 212 NETFS_UNBUFFERED_WRITE, /* This is an unbuffered write */ 213 NETFS_DIO_READ, /* This is a direct I/O read */ 214 NETFS_DIO_WRITE, /* This is a direct I/O write */ 215 nr__netfs_io_origin 216} __mode(byte); 217 218/* 219 * Descriptor for an I/O helper request. This is used to make multiple I/O 220 * operations to a variety of data stores and then stitch the result together. 221 */ 222struct netfs_io_request { 223 union { 224 struct work_struct work; 225 struct rcu_head rcu; 226 }; 227 struct inode *inode; /* The file being accessed */ 228 struct address_space *mapping; /* The mapping being accessed */ 229 struct kiocb *iocb; /* AIO completion vector */ 230 struct netfs_cache_resources cache_resources; 231 struct list_head proc_link; /* Link in netfs_iorequests */ 232 struct list_head subrequests; /* Contributory I/O operations */ 233 struct netfs_io_stream io_streams[2]; /* Streams of parallel I/O operations */ 234#define NR_IO_STREAMS 2 //wreq->nr_io_streams 235 struct netfs_group *group; /* Writeback group being written back */ 236 struct iov_iter iter; /* Unencrypted-side iterator */ 237 struct iov_iter io_iter; /* I/O (Encrypted-side) iterator */ 238 void *netfs_priv; /* Private data for the netfs */ 239 void *netfs_priv2; /* Private data for the netfs */ 240 struct bio_vec *direct_bv; /* DIO buffer list (when handling iovec-iter) */ 241 unsigned int direct_bv_count; /* Number of elements in direct_bv[] */ 242 unsigned int debug_id; 243 unsigned int rsize; /* Maximum read size (0 for none) */ 244 unsigned int wsize; /* Maximum write size (0 for none) */ 245 atomic_t subreq_counter; /* Next subreq->debug_index */ 246 unsigned int nr_group_rel; /* Number of refs to release on ->group */ 247 spinlock_t lock; /* Lock for queuing subreqs */ 248 atomic_t nr_outstanding; /* Number of ops in progress */ 249 atomic_t nr_copy_ops; /* Number of copy-to-cache ops in progress */ 250 size_t upper_len; /* Length can be extended to here */ 251 unsigned long long submitted; /* Amount submitted for I/O so far */ 252 unsigned long long len; /* Length of the request */ 253 size_t transferred; /* Amount to be indicated as transferred */ 254 short error; /* 0 or error that occurred */ 255 enum netfs_io_origin origin; /* Origin of the request */ 256 bool direct_bv_unpin; /* T if direct_bv[] must be unpinned */ 257 unsigned long long i_size; /* Size of the file */ 258 unsigned long long start; /* Start position */ 259 atomic64_t issued_to; /* Write issuer folio cursor */ 260 unsigned long long contiguity; /* Tracking for gaps in the writeback sequence */ 261 unsigned long long collected_to; /* Point we've collected to */ 262 unsigned long long cleaned_to; /* Position we've cleaned folios to */ 263 pgoff_t no_unlock_folio; /* Don't unlock this folio after read */ 264 refcount_t ref; 265 unsigned long flags; 266#define NETFS_RREQ_INCOMPLETE_IO 0 /* Some ioreqs terminated short or with error */ 267#define NETFS_RREQ_COPY_TO_CACHE 1 /* Need to write to the cache */ 268#define NETFS_RREQ_NO_UNLOCK_FOLIO 2 /* Don't unlock no_unlock_folio on completion */ 269#define NETFS_RREQ_DONT_UNLOCK_FOLIOS 3 /* Don't unlock the folios on completion */ 270#define NETFS_RREQ_FAILED 4 /* The request failed */ 271#define NETFS_RREQ_IN_PROGRESS 5 /* Unlocked when the request completes */ 272#define NETFS_RREQ_WRITE_TO_CACHE 7 /* Need to write to the cache */ 273#define NETFS_RREQ_UPLOAD_TO_SERVER 8 /* Need to write to the server */ 274#define NETFS_RREQ_NONBLOCK 9 /* Don't block if possible (O_NONBLOCK) */ 275#define NETFS_RREQ_BLOCKED 10 /* We blocked */ 276#define NETFS_RREQ_PAUSE 11 /* Pause subrequest generation */ 277#define NETFS_RREQ_USE_IO_ITER 12 /* Use ->io_iter rather than ->i_pages */ 278#define NETFS_RREQ_ALL_QUEUED 13 /* All subreqs are now queued */ 279#define NETFS_RREQ_USE_PGPRIV2 31 /* [DEPRECATED] Use PG_private_2 to mark 280 * write to cache on read */ 281 const struct netfs_request_ops *netfs_ops; 282 void (*cleanup)(struct netfs_io_request *req); 283}; 284 285/* 286 * Operations the network filesystem can/must provide to the helpers. 287 */ 288struct netfs_request_ops { 289 mempool_t *request_pool; 290 mempool_t *subrequest_pool; 291 int (*init_request)(struct netfs_io_request *rreq, struct file *file); 292 void (*free_request)(struct netfs_io_request *rreq); 293 void (*free_subrequest)(struct netfs_io_subrequest *rreq); 294 295 /* Read request handling */ 296 void (*expand_readahead)(struct netfs_io_request *rreq); 297 bool (*clamp_length)(struct netfs_io_subrequest *subreq); 298 void (*issue_read)(struct netfs_io_subrequest *subreq); 299 bool (*is_still_valid)(struct netfs_io_request *rreq); 300 int (*check_write_begin)(struct file *file, loff_t pos, unsigned len, 301 struct folio **foliop, void **_fsdata); 302 void (*done)(struct netfs_io_request *rreq); 303 304 /* Modification handling */ 305 void (*update_i_size)(struct inode *inode, loff_t i_size); 306 void (*post_modify)(struct inode *inode); 307 308 /* Write request handling */ 309 void (*begin_writeback)(struct netfs_io_request *wreq); 310 void (*prepare_write)(struct netfs_io_subrequest *subreq); 311 void (*issue_write)(struct netfs_io_subrequest *subreq); 312 void (*retry_request)(struct netfs_io_request *wreq, struct netfs_io_stream *stream); 313 void (*invalidate_cache)(struct netfs_io_request *wreq); 314}; 315 316/* 317 * How to handle reading from a hole. 318 */ 319enum netfs_read_from_hole { 320 NETFS_READ_HOLE_IGNORE, 321 NETFS_READ_HOLE_CLEAR, 322 NETFS_READ_HOLE_FAIL, 323}; 324 325/* 326 * Table of operations for access to a cache. 327 */ 328struct netfs_cache_ops { 329 /* End an operation */ 330 void (*end_operation)(struct netfs_cache_resources *cres); 331 332 /* Read data from the cache */ 333 int (*read)(struct netfs_cache_resources *cres, 334 loff_t start_pos, 335 struct iov_iter *iter, 336 enum netfs_read_from_hole read_hole, 337 netfs_io_terminated_t term_func, 338 void *term_func_priv); 339 340 /* Write data to the cache */ 341 int (*write)(struct netfs_cache_resources *cres, 342 loff_t start_pos, 343 struct iov_iter *iter, 344 netfs_io_terminated_t term_func, 345 void *term_func_priv); 346 347 /* Write data to the cache from a netfs subrequest. */ 348 void (*issue_write)(struct netfs_io_subrequest *subreq); 349 350 /* Expand readahead request */ 351 void (*expand_readahead)(struct netfs_cache_resources *cres, 352 unsigned long long *_start, 353 unsigned long long *_len, 354 unsigned long long i_size); 355 356 /* Prepare a read operation, shortening it to a cached/uncached 357 * boundary as appropriate. 358 */ 359 enum netfs_io_source (*prepare_read)(struct netfs_io_subrequest *subreq, 360 unsigned long long i_size); 361 362 /* Prepare a write subrequest, working out if we're allowed to do it 363 * and finding out the maximum amount of data to gather before 364 * attempting to submit. If we're not permitted to do it, the 365 * subrequest should be marked failed. 366 */ 367 void (*prepare_write_subreq)(struct netfs_io_subrequest *subreq); 368 369 /* Prepare a write operation, working out what part of the write we can 370 * actually do. 371 */ 372 int (*prepare_write)(struct netfs_cache_resources *cres, 373 loff_t *_start, size_t *_len, size_t upper_len, 374 loff_t i_size, bool no_space_allocated_yet); 375 376 /* Prepare an on-demand read operation, shortening it to a cached/uncached 377 * boundary as appropriate. 378 */ 379 enum netfs_io_source (*prepare_ondemand_read)(struct netfs_cache_resources *cres, 380 loff_t start, size_t *_len, 381 loff_t i_size, 382 unsigned long *_flags, ino_t ino); 383 384 /* Query the occupancy of the cache in a region, returning where the 385 * next chunk of data starts and how long it is. 386 */ 387 int (*query_occupancy)(struct netfs_cache_resources *cres, 388 loff_t start, size_t len, size_t granularity, 389 loff_t *_data_start, size_t *_data_len); 390}; 391 392/* High-level read API. */ 393ssize_t netfs_unbuffered_read_iter_locked(struct kiocb *iocb, struct iov_iter *iter); 394ssize_t netfs_unbuffered_read_iter(struct kiocb *iocb, struct iov_iter *iter); 395ssize_t netfs_buffered_read_iter(struct kiocb *iocb, struct iov_iter *iter); 396ssize_t netfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter); 397 398/* High-level write API */ 399ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, 400 struct netfs_group *netfs_group); 401ssize_t netfs_buffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *from, 402 struct netfs_group *netfs_group); 403ssize_t netfs_unbuffered_write_iter(struct kiocb *iocb, struct iov_iter *from); 404ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *iter, 405 struct netfs_group *netfs_group); 406ssize_t netfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from); 407 408/* Address operations API */ 409struct readahead_control; 410void netfs_readahead(struct readahead_control *); 411int netfs_read_folio(struct file *, struct folio *); 412int netfs_write_begin(struct netfs_inode *, struct file *, 413 struct address_space *, loff_t pos, unsigned int len, 414 struct folio **, void **fsdata); 415int netfs_writepages(struct address_space *mapping, 416 struct writeback_control *wbc); 417bool netfs_dirty_folio(struct address_space *mapping, struct folio *folio); 418int netfs_unpin_writeback(struct inode *inode, struct writeback_control *wbc); 419void netfs_clear_inode_writeback(struct inode *inode, const void *aux); 420void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length); 421bool netfs_release_folio(struct folio *folio, gfp_t gfp); 422 423/* VMA operations API. */ 424vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_group); 425 426/* (Sub)request management API. */ 427void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool); 428void netfs_get_subrequest(struct netfs_io_subrequest *subreq, 429 enum netfs_sreq_ref_trace what); 430void netfs_put_subrequest(struct netfs_io_subrequest *subreq, 431 bool was_async, enum netfs_sreq_ref_trace what); 432ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len, 433 struct iov_iter *new, 434 iov_iter_extraction_t extraction_flags); 435size_t netfs_limit_iter(const struct iov_iter *iter, size_t start_offset, 436 size_t max_size, size_t max_segs); 437void netfs_prepare_write_failed(struct netfs_io_subrequest *subreq); 438void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error, 439 bool was_async); 440void netfs_queue_write_request(struct netfs_io_subrequest *subreq); 441 442int netfs_start_io_read(struct inode *inode); 443void netfs_end_io_read(struct inode *inode); 444int netfs_start_io_write(struct inode *inode); 445void netfs_end_io_write(struct inode *inode); 446int netfs_start_io_direct(struct inode *inode); 447void netfs_end_io_direct(struct inode *inode); 448 449/** 450 * netfs_inode - Get the netfs inode context from the inode 451 * @inode: The inode to query 452 * 453 * Get the netfs lib inode context from the network filesystem's inode. The 454 * context struct is expected to directly follow on from the VFS inode struct. 455 */ 456static inline struct netfs_inode *netfs_inode(struct inode *inode) 457{ 458 return container_of(inode, struct netfs_inode, inode); 459} 460 461/** 462 * netfs_inode_init - Initialise a netfslib inode context 463 * @ctx: The netfs inode to initialise 464 * @ops: The netfs's operations list 465 * @use_zero_point: True to use the zero_point read optimisation 466 * 467 * Initialise the netfs library context struct. This is expected to follow on 468 * directly from the VFS inode struct. 469 */ 470static inline void netfs_inode_init(struct netfs_inode *ctx, 471 const struct netfs_request_ops *ops, 472 bool use_zero_point) 473{ 474 ctx->ops = ops; 475 ctx->remote_i_size = i_size_read(&ctx->inode); 476 ctx->zero_point = LLONG_MAX; 477 ctx->flags = 0; 478 atomic_set(&ctx->io_count, 0); 479#if IS_ENABLED(CONFIG_FSCACHE) 480 ctx->cache = NULL; 481#endif 482 mutex_init(&ctx->wb_lock); 483 /* ->releasepage() drives zero_point */ 484 if (use_zero_point) { 485 ctx->zero_point = ctx->remote_i_size; 486 mapping_set_release_always(ctx->inode.i_mapping); 487 } 488} 489 490/** 491 * netfs_resize_file - Note that a file got resized 492 * @ctx: The netfs inode being resized 493 * @new_i_size: The new file size 494 * @changed_on_server: The change was applied to the server 495 * 496 * Inform the netfs lib that a file got resized so that it can adjust its state. 497 */ 498static inline void netfs_resize_file(struct netfs_inode *ctx, loff_t new_i_size, 499 bool changed_on_server) 500{ 501 if (changed_on_server) 502 ctx->remote_i_size = new_i_size; 503 if (new_i_size < ctx->zero_point) 504 ctx->zero_point = new_i_size; 505} 506 507/** 508 * netfs_i_cookie - Get the cache cookie from the inode 509 * @ctx: The netfs inode to query 510 * 511 * Get the caching cookie (if enabled) from the network filesystem's inode. 512 */ 513static inline struct fscache_cookie *netfs_i_cookie(struct netfs_inode *ctx) 514{ 515#if IS_ENABLED(CONFIG_FSCACHE) 516 return ctx->cache; 517#else 518 return NULL; 519#endif 520} 521 522/** 523 * netfs_wait_for_outstanding_io - Wait for outstanding I/O to complete 524 * @ctx: The netfs inode to wait on 525 * 526 * Wait for outstanding I/O requests of any type to complete. This is intended 527 * to be called from inode eviction routines. This makes sure that any 528 * resources held by those requests are cleaned up before we let the inode get 529 * cleaned up. 530 */ 531static inline void netfs_wait_for_outstanding_io(struct inode *inode) 532{ 533 struct netfs_inode *ictx = netfs_inode(inode); 534 535 wait_var_event(&ictx->io_count, atomic_read(&ictx->io_count) == 0); 536} 537 538#endif /* _LINUX_NETFS_H */ 539