18d59ecb2SHans Petter Selasky /*- 28d59ecb2SHans Petter Selasky * Copyright (c) 2010 Isilon Systems, Inc. 38d59ecb2SHans Petter Selasky * Copyright (c) 2010 iX Systems, Inc. 48d59ecb2SHans Petter Selasky * Copyright (c) 2010 Panasas, Inc. 59c7b53ccSSlava Shwartsman * Copyright (c) 2013-2018 Mellanox Technologies, Ltd. 68d59ecb2SHans Petter Selasky * All rights reserved. 78d59ecb2SHans Petter Selasky * 88d59ecb2SHans Petter Selasky * Redistribution and use in source and binary forms, with or without 98d59ecb2SHans Petter Selasky * modification, are permitted provided that the following conditions 108d59ecb2SHans Petter Selasky * are met: 118d59ecb2SHans Petter Selasky * 1. Redistributions of source code must retain the above copyright 128d59ecb2SHans Petter Selasky * notice unmodified, this list of conditions, and the following 138d59ecb2SHans Petter Selasky * disclaimer. 148d59ecb2SHans Petter Selasky * 2. Redistributions in binary form must reproduce the above copyright 158d59ecb2SHans Petter Selasky * notice, this list of conditions and the following disclaimer in the 168d59ecb2SHans Petter Selasky * documentation and/or other materials provided with the distribution. 178d59ecb2SHans Petter Selasky * 188d59ecb2SHans Petter Selasky * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 198d59ecb2SHans Petter Selasky * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 208d59ecb2SHans Petter Selasky * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 218d59ecb2SHans Petter Selasky * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 228d59ecb2SHans Petter Selasky * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 238d59ecb2SHans Petter Selasky * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 248d59ecb2SHans Petter Selasky * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 258d59ecb2SHans Petter Selasky * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 268d59ecb2SHans Petter Selasky * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 278d59ecb2SHans Petter Selasky * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 288d59ecb2SHans Petter Selasky * 298d59ecb2SHans Petter Selasky * $FreeBSD$ 308d59ecb2SHans Petter Selasky */ 31307f78f3SVladimir Kondratyev #ifndef _LINUXKPI_LINUX_FS_H_ 32307f78f3SVladimir Kondratyev #define _LINUXKPI_LINUX_FS_H_ 338d59ecb2SHans Petter Selasky 348d59ecb2SHans Petter Selasky #include <sys/cdefs.h> 358d59ecb2SHans Petter Selasky #include <sys/param.h> 368d59ecb2SHans Petter Selasky #include <sys/systm.h> 378d59ecb2SHans Petter Selasky #include <sys/conf.h> 388d59ecb2SHans Petter Selasky #include <sys/vnode.h> 398d59ecb2SHans Petter Selasky #include <sys/file.h> 408d59ecb2SHans Petter Selasky #include <sys/filedesc.h> 418d59ecb2SHans Petter Selasky #include <linux/types.h> 428d59ecb2SHans Petter Selasky #include <linux/wait.h> 438d59ecb2SHans Petter Selasky #include <linux/semaphore.h> 44a6b28ee0SHans Petter Selasky #include <linux/spinlock.h> 45b15a13afSHans Petter Selasky #include <linux/dcache.h> 46f1a7639aSVladimir Kondratyev #include <linux/capability.h> 47f1a7639aSVladimir Kondratyev #include <linux/wait_bit.h> 48f697b943SJake Freeland #include <linux/kernel.h> 49f697b943SJake Freeland #include <linux/mutex.h> 508d59ecb2SHans Petter Selasky 518d59ecb2SHans Petter Selasky struct module; 528d59ecb2SHans Petter Selasky struct kiocb; 538d59ecb2SHans Petter Selasky struct iovec; 548d59ecb2SHans Petter Selasky struct dentry; 558d59ecb2SHans Petter Selasky struct page; 568d59ecb2SHans Petter Selasky struct file_lock; 578d59ecb2SHans Petter Selasky struct pipe_inode_info; 588d59ecb2SHans Petter Selasky struct vm_area_struct; 598d59ecb2SHans Petter Selasky struct poll_table_struct; 608d59ecb2SHans Petter Selasky struct files_struct; 617e1a02baSMark Johnston struct pfs_node; 629c7b53ccSSlava Shwartsman struct linux_cdev; 638d59ecb2SHans Petter Selasky 648d59ecb2SHans Petter Selasky #define inode vnode 658d59ecb2SHans Petter Selasky #define i_cdev v_rdev 667e1a02baSMark Johnston #define i_private v_data 678d59ecb2SHans Petter Selasky 688d59ecb2SHans Petter Selasky #define S_IRUGO (S_IRUSR | S_IRGRP | S_IROTH) 698d59ecb2SHans Petter Selasky #define S_IWUGO (S_IWUSR | S_IWGRP | S_IWOTH) 708d59ecb2SHans Petter Selasky 718d59ecb2SHans Petter Selasky typedef struct files_struct *fl_owner_t; 728d59ecb2SHans Petter Selasky 738d59ecb2SHans Petter Selasky struct file_operations; 748d59ecb2SHans Petter Selasky 756dec7efaSHans Petter Selasky struct linux_file_wait_queue { 766dec7efaSHans Petter Selasky struct wait_queue wq; 776dec7efaSHans Petter Selasky struct wait_queue_head *wqh; 786dec7efaSHans Petter Selasky atomic_t state; 796dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_INIT 0 806dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_NOT_READY 1 816dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_QUEUED 2 826dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_READY 3 836dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_MAX 4 846dec7efaSHans Petter Selasky }; 856dec7efaSHans Petter Selasky 868d59ecb2SHans Petter Selasky struct linux_file { 878d59ecb2SHans Petter Selasky struct file *_file; 888d59ecb2SHans Petter Selasky const struct file_operations *f_op; 898d59ecb2SHans Petter Selasky void *private_data; 908d59ecb2SHans Petter Selasky int f_flags; 918d59ecb2SHans Petter Selasky int f_mode; /* Just starting mode. */ 928d59ecb2SHans Petter Selasky struct dentry *f_dentry; 938d59ecb2SHans Petter Selasky struct dentry f_dentry_store; 948d59ecb2SHans Petter Selasky struct selinfo f_selinfo; 958d59ecb2SHans Petter Selasky struct sigio *f_sigio; 968d59ecb2SHans Petter Selasky struct vnode *f_vnode; 97dac6b88aSMark Johnston #define f_inode f_vnode 98f5a9867bSHans Petter Selasky volatile u_int f_count; 99a6b28ee0SHans Petter Selasky 100dac6b88aSMark Johnston /* anonymous shmem object */ 101dac6b88aSMark Johnston vm_object_t f_shmem; 102dac6b88aSMark Johnston 103a6b28ee0SHans Petter Selasky /* kqfilter support */ 104a6b28ee0SHans Petter Selasky int f_kqflags; 105a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_HAS_READ (1 << 0) 106a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_HAS_WRITE (1 << 1) 107a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_NEED_READ (1 << 2) 108a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_NEED_WRITE (1 << 3) 109a6b28ee0SHans Petter Selasky /* protects f_selinfo.si_note */ 110a6b28ee0SHans Petter Selasky spinlock_t f_kqlock; 1116dec7efaSHans Petter Selasky struct linux_file_wait_queue f_wait_queue; 1129c7b53ccSSlava Shwartsman 1139c7b53ccSSlava Shwartsman /* pointer to associated character device, if any */ 1149c7b53ccSSlava Shwartsman struct linux_cdev *f_cdev; 115a81b36c6SVladimir Kondratyev 116a81b36c6SVladimir Kondratyev struct rcu_head rcu; 1178d59ecb2SHans Petter Selasky }; 1188d59ecb2SHans Petter Selasky 1198d59ecb2SHans Petter Selasky #define file linux_file 1208d59ecb2SHans Petter Selasky #define fasync_struct sigio * 1218d59ecb2SHans Petter Selasky 1228d59ecb2SHans Petter Selasky #define fasync_helper(fd, filp, on, queue) \ 1238d59ecb2SHans Petter Selasky ({ \ 1248d59ecb2SHans Petter Selasky if ((on)) \ 1258d59ecb2SHans Petter Selasky *(queue) = &(filp)->f_sigio; \ 1268d59ecb2SHans Petter Selasky else \ 1278d59ecb2SHans Petter Selasky *(queue) = NULL; \ 1288d59ecb2SHans Petter Selasky 0; \ 1298d59ecb2SHans Petter Selasky }) 1308d59ecb2SHans Petter Selasky 1318d59ecb2SHans Petter Selasky #define kill_fasync(queue, sig, pollstat) \ 1328d59ecb2SHans Petter Selasky do { \ 1338d59ecb2SHans Petter Selasky if (*(queue) != NULL) \ 1348d59ecb2SHans Petter Selasky pgsigio(*(queue), (sig), 0); \ 1358d59ecb2SHans Petter Selasky } while (0) 1368d59ecb2SHans Petter Selasky 1372ce1771cSMatt Macy typedef int (*filldir_t)(void *, const char *, int, off_t, u64, unsigned); 1388d59ecb2SHans Petter Selasky 1398d59ecb2SHans Petter Selasky struct file_operations { 1408d59ecb2SHans Petter Selasky struct module *owner; 1412ce1771cSMatt Macy ssize_t (*read)(struct linux_file *, char __user *, size_t, off_t *); 1422ce1771cSMatt Macy ssize_t (*write)(struct linux_file *, const char __user *, size_t, off_t *); 1432ce1771cSMatt Macy unsigned int (*poll) (struct linux_file *, struct poll_table_struct *); 1442ce1771cSMatt Macy long (*unlocked_ioctl)(struct linux_file *, unsigned int, unsigned long); 1452ce1771cSMatt Macy long (*compat_ioctl)(struct linux_file *, unsigned int, unsigned long); 1462ce1771cSMatt Macy int (*mmap)(struct linux_file *, struct vm_area_struct *); 1478d59ecb2SHans Petter Selasky int (*open)(struct inode *, struct file *); 1482ce1771cSMatt Macy int (*release)(struct inode *, struct linux_file *); 1492ce1771cSMatt Macy int (*fasync)(int, struct linux_file *, int); 1508d59ecb2SHans Petter Selasky 1518d59ecb2SHans Petter Selasky /* Although not supported in FreeBSD, to align with Linux code 1528d59ecb2SHans Petter Selasky * we are adding llseek() only when it is mapped to no_llseek which returns 1538d59ecb2SHans Petter Selasky * an illegal seek error 1548d59ecb2SHans Petter Selasky */ 1552ce1771cSMatt Macy off_t (*llseek)(struct linux_file *, off_t, int); 1568d59ecb2SHans Petter Selasky #if 0 1578d59ecb2SHans Petter Selasky /* We do not support these methods. Don't permit them to compile. */ 1588d59ecb2SHans Petter Selasky loff_t (*llseek)(struct file *, loff_t, int); 1598d59ecb2SHans Petter Selasky ssize_t (*aio_read)(struct kiocb *, const struct iovec *, 1608d59ecb2SHans Petter Selasky unsigned long, loff_t); 1618d59ecb2SHans Petter Selasky ssize_t (*aio_write)(struct kiocb *, const struct iovec *, 1628d59ecb2SHans Petter Selasky unsigned long, loff_t); 1638d59ecb2SHans Petter Selasky int (*readdir)(struct file *, void *, filldir_t); 1648d59ecb2SHans Petter Selasky int (*ioctl)(struct inode *, struct file *, unsigned int, 1658d59ecb2SHans Petter Selasky unsigned long); 1668d59ecb2SHans Petter Selasky int (*flush)(struct file *, fl_owner_t id); 1678d59ecb2SHans Petter Selasky int (*fsync)(struct file *, struct dentry *, int datasync); 1688d59ecb2SHans Petter Selasky int (*aio_fsync)(struct kiocb *, int datasync); 1698d59ecb2SHans Petter Selasky int (*lock)(struct file *, int, struct file_lock *); 1708d59ecb2SHans Petter Selasky ssize_t (*sendpage)(struct file *, struct page *, int, size_t, 1718d59ecb2SHans Petter Selasky loff_t *, int); 1728d59ecb2SHans Petter Selasky unsigned long (*get_unmapped_area)(struct file *, unsigned long, 1738d59ecb2SHans Petter Selasky unsigned long, unsigned long, unsigned long); 1748d59ecb2SHans Petter Selasky int (*check_flags)(int); 1758d59ecb2SHans Petter Selasky int (*flock)(struct file *, int, struct file_lock *); 1768d59ecb2SHans Petter Selasky ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, 1778d59ecb2SHans Petter Selasky loff_t *, size_t, unsigned int); 1788d59ecb2SHans Petter Selasky ssize_t (*splice_read)(struct file *, loff_t *, 1798d59ecb2SHans Petter Selasky struct pipe_inode_info *, size_t, unsigned int); 1808d59ecb2SHans Petter Selasky int (*setlease)(struct file *, long, struct file_lock **); 1818d59ecb2SHans Petter Selasky #endif 1828d59ecb2SHans Petter Selasky }; 1838d59ecb2SHans Petter Selasky #define fops_get(fops) (fops) 184dac6b88aSMark Johnston #define replace_fops(f, fops) ((f)->f_op = (fops)) 1858d59ecb2SHans Petter Selasky 1868d59ecb2SHans Petter Selasky #define FMODE_READ FREAD 1878d59ecb2SHans Petter Selasky #define FMODE_WRITE FWRITE 1888d59ecb2SHans Petter Selasky #define FMODE_EXEC FEXEC 189a91b408aSEmmanuel Vadot #define FMODE_UNSIGNED_OFFSET 0x2000 1901125dbc0SHans Petter Selasky int __register_chrdev(unsigned int major, unsigned int baseminor, 1911125dbc0SHans Petter Selasky unsigned int count, const char *name, 1921125dbc0SHans Petter Selasky const struct file_operations *fops); 1931125dbc0SHans Petter Selasky int __register_chrdev_p(unsigned int major, unsigned int baseminor, 1941125dbc0SHans Petter Selasky unsigned int count, const char *name, 1951125dbc0SHans Petter Selasky const struct file_operations *fops, uid_t uid, 1961125dbc0SHans Petter Selasky gid_t gid, int mode); 1971125dbc0SHans Petter Selasky void __unregister_chrdev(unsigned int major, unsigned int baseminor, 1981125dbc0SHans Petter Selasky unsigned int count, const char *name); 1991125dbc0SHans Petter Selasky 2001125dbc0SHans Petter Selasky static inline void 2011125dbc0SHans Petter Selasky unregister_chrdev(unsigned int major, const char *name) 2021125dbc0SHans Petter Selasky { 2031125dbc0SHans Petter Selasky 2041125dbc0SHans Petter Selasky __unregister_chrdev(major, 0, 256, name); 2051125dbc0SHans Petter Selasky } 2061125dbc0SHans Petter Selasky 2071125dbc0SHans Petter Selasky static inline int 2081125dbc0SHans Petter Selasky register_chrdev(unsigned int major, const char *name, 2091125dbc0SHans Petter Selasky const struct file_operations *fops) 2101125dbc0SHans Petter Selasky { 2111125dbc0SHans Petter Selasky 2121125dbc0SHans Petter Selasky return (__register_chrdev(major, 0, 256, name, fops)); 2131125dbc0SHans Petter Selasky } 2141125dbc0SHans Petter Selasky 2151125dbc0SHans Petter Selasky static inline int 2161125dbc0SHans Petter Selasky register_chrdev_p(unsigned int major, const char *name, 2171125dbc0SHans Petter Selasky const struct file_operations *fops, uid_t uid, gid_t gid, int mode) 2181125dbc0SHans Petter Selasky { 2191125dbc0SHans Petter Selasky 2201125dbc0SHans Petter Selasky return (__register_chrdev_p(major, 0, 256, name, fops, uid, gid, mode)); 2211125dbc0SHans Petter Selasky } 2221125dbc0SHans Petter Selasky 2238d59ecb2SHans Petter Selasky static inline int 2248d59ecb2SHans Petter Selasky register_chrdev_region(dev_t dev, unsigned range, const char *name) 2258d59ecb2SHans Petter Selasky { 2268d59ecb2SHans Petter Selasky 2278d59ecb2SHans Petter Selasky return 0; 2288d59ecb2SHans Petter Selasky } 2298d59ecb2SHans Petter Selasky 2308d59ecb2SHans Petter Selasky static inline void 2318d59ecb2SHans Petter Selasky unregister_chrdev_region(dev_t dev, unsigned range) 2328d59ecb2SHans Petter Selasky { 2338d59ecb2SHans Petter Selasky 2348d59ecb2SHans Petter Selasky return; 2358d59ecb2SHans Petter Selasky } 2368d59ecb2SHans Petter Selasky 2378d59ecb2SHans Petter Selasky static inline int 2388d59ecb2SHans Petter Selasky alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count, 2398d59ecb2SHans Petter Selasky const char *name) 2408d59ecb2SHans Petter Selasky { 2418d59ecb2SHans Petter Selasky 2428d59ecb2SHans Petter Selasky return 0; 2438d59ecb2SHans Petter Selasky } 2448d59ecb2SHans Petter Selasky 2458d59ecb2SHans Petter Selasky /* No current support for seek op in FreeBSD */ 2468d59ecb2SHans Petter Selasky static inline int 2478d59ecb2SHans Petter Selasky nonseekable_open(struct inode *inode, struct file *filp) 2488d59ecb2SHans Petter Selasky { 2498d59ecb2SHans Petter Selasky return 0; 2508d59ecb2SHans Petter Selasky } 2518d59ecb2SHans Petter Selasky 25241dee251SBjoern A. Zeeb static inline int 25341dee251SBjoern A. Zeeb simple_open(struct inode *inode, struct file *filp) 25441dee251SBjoern A. Zeeb { 255f697b943SJake Freeland filp->private_data = inode->i_private; 25641dee251SBjoern A. Zeeb return 0; 25741dee251SBjoern A. Zeeb } 25841dee251SBjoern A. Zeeb 2592b79a966SHans Petter Selasky extern unsigned int linux_iminor(struct inode *); 2602b79a966SHans Petter Selasky #define iminor(...) linux_iminor(__VA_ARGS__) 2618d59ecb2SHans Petter Selasky 262f5a9867bSHans Petter Selasky static inline struct linux_file * 263f5a9867bSHans Petter Selasky get_file(struct linux_file *f) 264f5a9867bSHans Petter Selasky { 265f5a9867bSHans Petter Selasky 266f5a9867bSHans Petter Selasky refcount_acquire(f->_file == NULL ? &f->f_count : &f->_file->f_count); 267f5a9867bSHans Petter Selasky return (f); 268f5a9867bSHans Petter Selasky } 269f5a9867bSHans Petter Selasky 270a81b36c6SVladimir Kondratyev static inline bool 271a81b36c6SVladimir Kondratyev get_file_rcu(struct linux_file *f) 272a81b36c6SVladimir Kondratyev { 273a81b36c6SVladimir Kondratyev return (refcount_acquire_if_not_zero( 274a81b36c6SVladimir Kondratyev f->_file == NULL ? &f->f_count : &f->_file->f_count)); 275a81b36c6SVladimir Kondratyev } 276a81b36c6SVladimir Kondratyev 2778d59ecb2SHans Petter Selasky static inline struct inode * 2788d59ecb2SHans Petter Selasky igrab(struct inode *inode) 2798d59ecb2SHans Petter Selasky { 2808d59ecb2SHans Petter Selasky int error; 2818d59ecb2SHans Petter Selasky 282a92a971bSMateusz Guzik error = vget(inode, 0); 2838d59ecb2SHans Petter Selasky if (error) 2848d59ecb2SHans Petter Selasky return (NULL); 2858d59ecb2SHans Petter Selasky 2868d59ecb2SHans Petter Selasky return (inode); 2878d59ecb2SHans Petter Selasky } 2888d59ecb2SHans Petter Selasky 2898d59ecb2SHans Petter Selasky static inline void 2908d59ecb2SHans Petter Selasky iput(struct inode *inode) 2918d59ecb2SHans Petter Selasky { 2928d59ecb2SHans Petter Selasky 2938d59ecb2SHans Petter Selasky vrele(inode); 2948d59ecb2SHans Petter Selasky } 2958d59ecb2SHans Petter Selasky 2968d59ecb2SHans Petter Selasky static inline loff_t 2978d59ecb2SHans Petter Selasky no_llseek(struct file *file, loff_t offset, int whence) 2988d59ecb2SHans Petter Selasky { 2994eb1bcfcSMark Johnston 3004eb1bcfcSMark Johnston return (-ESPIPE); 3014eb1bcfcSMark Johnston } 3024eb1bcfcSMark Johnston 3034eb1bcfcSMark Johnston static inline loff_t 304f697b943SJake Freeland default_llseek(struct file *file, loff_t offset, int whence) 305f697b943SJake Freeland { 306f697b943SJake Freeland return (no_llseek(file, offset, whence)); 307f697b943SJake Freeland } 308f697b943SJake Freeland 309f697b943SJake Freeland static inline loff_t 3104eb1bcfcSMark Johnston noop_llseek(struct linux_file *file, loff_t offset, int whence) 3114eb1bcfcSMark Johnston { 3124eb1bcfcSMark Johnston 3134eb1bcfcSMark Johnston return (file->_file->f_offset); 3148d59ecb2SHans Petter Selasky } 3158d59ecb2SHans Petter Selasky 316d51be359SHans Petter Selasky static inline struct vnode * 317d51be359SHans Petter Selasky file_inode(const struct linux_file *file) 318d51be359SHans Petter Selasky { 319d51be359SHans Petter Selasky 320d51be359SHans Petter Selasky return (file->f_vnode); 321d51be359SHans Petter Selasky } 322d51be359SHans Petter Selasky 323d51be359SHans Petter Selasky static inline int 324d51be359SHans Petter Selasky call_mmap(struct linux_file *file, struct vm_area_struct *vma) 325d51be359SHans Petter Selasky { 326d51be359SHans Petter Selasky 327d51be359SHans Petter Selasky return (file->f_op->mmap(file, vma)); 328d51be359SHans Petter Selasky } 329d51be359SHans Petter Selasky 330f697b943SJake Freeland static inline void 331f697b943SJake Freeland i_size_write(struct inode *inode, loff_t i_size) 332f697b943SJake Freeland { 333f697b943SJake Freeland } 334f697b943SJake Freeland 335f697b943SJake Freeland /* 336f697b943SJake Freeland * simple_read_from_buffer: copy data from kernel-space origin 337f697b943SJake Freeland * buffer into user-space destination buffer 338f697b943SJake Freeland * 339f697b943SJake Freeland * @dest: destination buffer 340f697b943SJake Freeland * @read_size: number of bytes to be transferred 341f697b943SJake Freeland * @ppos: starting transfer position pointer 342f697b943SJake Freeland * @orig: origin buffer 343f697b943SJake Freeland * @buf_size: size of destination and origin buffers 344f697b943SJake Freeland * 345f697b943SJake Freeland * Return value: 346f697b943SJake Freeland * On success, total bytes copied with *ppos incremented accordingly. 347f697b943SJake Freeland * On failure, negative value. 348f697b943SJake Freeland */ 349f697b943SJake Freeland static inline ssize_t 350f697b943SJake Freeland simple_read_from_buffer(void __user *dest, size_t read_size, loff_t *ppos, 351f697b943SJake Freeland void *orig, size_t buf_size) 352f697b943SJake Freeland { 353f697b943SJake Freeland void *read_pos = ((char *) orig) + *ppos; 354f697b943SJake Freeland size_t buf_remain = buf_size - *ppos; 355f697b943SJake Freeland ssize_t num_read; 356f697b943SJake Freeland 357f697b943SJake Freeland if (buf_remain < 0 || buf_remain > buf_size) 358f697b943SJake Freeland return -EINVAL; 359f697b943SJake Freeland 360f697b943SJake Freeland if (read_size > buf_remain) 361f697b943SJake Freeland read_size = buf_remain; 362f697b943SJake Freeland 363f697b943SJake Freeland /* copy_to_user returns number of bytes NOT read */ 364f697b943SJake Freeland num_read = read_size - copy_to_user(dest, read_pos, read_size); 365f697b943SJake Freeland if (num_read == 0) 366f697b943SJake Freeland return -EFAULT; 367f697b943SJake Freeland *ppos += num_read; 368f697b943SJake Freeland 369f697b943SJake Freeland return (num_read); 370f697b943SJake Freeland } 371f697b943SJake Freeland 372f697b943SJake Freeland MALLOC_DECLARE(M_LSATTR); 373f697b943SJake Freeland 374f697b943SJake Freeland #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ 375f697b943SJake Freeland static inline int \ 376f697b943SJake Freeland __fops ## _open(struct inode *inode, struct file *filp) \ 377f697b943SJake Freeland { \ 378f697b943SJake Freeland return (simple_attr_open(inode, filp, __get, __set, __fmt)); \ 379f697b943SJake Freeland } \ 380f697b943SJake Freeland static const struct file_operations __fops = { \ 381f697b943SJake Freeland .owner = THIS_MODULE, \ 382f697b943SJake Freeland .open = __fops ## _open, \ 383f697b943SJake Freeland .release = simple_attr_release, \ 384f697b943SJake Freeland .read = simple_attr_read, \ 385f697b943SJake Freeland .write = simple_attr_write, \ 386f697b943SJake Freeland .llseek = no_llseek \ 387f697b943SJake Freeland } 388f697b943SJake Freeland 389f697b943SJake Freeland int simple_attr_open(struct inode *inode, struct file *filp, 390f697b943SJake Freeland int (*get)(void *, uint64_t *), int (*set)(void *, uint64_t), 391f697b943SJake Freeland const char *fmt); 392f697b943SJake Freeland 393f697b943SJake Freeland int simple_attr_release(struct inode *inode, struct file *filp); 394f697b943SJake Freeland 395f697b943SJake Freeland ssize_t simple_attr_read(struct file *filp, char *buf, size_t read_size, loff_t *ppos); 396f697b943SJake Freeland 397f697b943SJake Freeland ssize_t simple_attr_write(struct file *filp, const char *buf, size_t write_size, loff_t *ppos); 398f697b943SJake Freeland 399307f78f3SVladimir Kondratyev #endif /* _LINUXKPI_LINUX_FS_H_ */ 400