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 */
29307f78f3SVladimir Kondratyev #ifndef _LINUXKPI_LINUX_FS_H_
30307f78f3SVladimir Kondratyev #define _LINUXKPI_LINUX_FS_H_
318d59ecb2SHans Petter Selasky
328d59ecb2SHans Petter Selasky #include <sys/param.h>
338d59ecb2SHans Petter Selasky #include <sys/systm.h>
348d59ecb2SHans Petter Selasky #include <sys/conf.h>
358d59ecb2SHans Petter Selasky #include <sys/vnode.h>
368d59ecb2SHans Petter Selasky #include <sys/file.h>
378d59ecb2SHans Petter Selasky #include <sys/filedesc.h>
388d59ecb2SHans Petter Selasky #include <linux/types.h>
398d59ecb2SHans Petter Selasky #include <linux/wait.h>
408d59ecb2SHans Petter Selasky #include <linux/semaphore.h>
41a6b28ee0SHans Petter Selasky #include <linux/spinlock.h>
42b15a13afSHans Petter Selasky #include <linux/dcache.h>
43f1a7639aSVladimir Kondratyev #include <linux/capability.h>
44f1a7639aSVladimir Kondratyev #include <linux/wait_bit.h>
45f697b943SJake Freeland #include <linux/kernel.h>
46f697b943SJake Freeland #include <linux/mutex.h>
478d59ecb2SHans Petter Selasky
488d59ecb2SHans Petter Selasky struct module;
498d59ecb2SHans Petter Selasky struct kiocb;
508d59ecb2SHans Petter Selasky struct iovec;
518d59ecb2SHans Petter Selasky struct dentry;
528d59ecb2SHans Petter Selasky struct page;
538d59ecb2SHans Petter Selasky struct file_lock;
548d59ecb2SHans Petter Selasky struct pipe_inode_info;
558d59ecb2SHans Petter Selasky struct vm_area_struct;
568d59ecb2SHans Petter Selasky struct poll_table_struct;
578d59ecb2SHans Petter Selasky struct files_struct;
587e1a02baSMark Johnston struct pfs_node;
599c7b53ccSSlava Shwartsman struct linux_cdev;
608d59ecb2SHans Petter Selasky
618d59ecb2SHans Petter Selasky #define inode vnode
628d59ecb2SHans Petter Selasky #define i_cdev v_rdev
637e1a02baSMark Johnston #define i_private v_data
648d59ecb2SHans Petter Selasky
658d59ecb2SHans Petter Selasky #define S_IRUGO (S_IRUSR | S_IRGRP | S_IROTH)
668d59ecb2SHans Petter Selasky #define S_IWUGO (S_IWUSR | S_IWGRP | S_IWOTH)
678d59ecb2SHans Petter Selasky
688d59ecb2SHans Petter Selasky typedef struct files_struct *fl_owner_t;
698d59ecb2SHans Petter Selasky
708d59ecb2SHans Petter Selasky struct file_operations;
718d59ecb2SHans Petter Selasky
726dec7efaSHans Petter Selasky struct linux_file_wait_queue {
736dec7efaSHans Petter Selasky struct wait_queue wq;
746dec7efaSHans Petter Selasky struct wait_queue_head *wqh;
756dec7efaSHans Petter Selasky atomic_t state;
766dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_INIT 0
776dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_NOT_READY 1
786dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_QUEUED 2
796dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_READY 3
806dec7efaSHans Petter Selasky #define LINUX_FWQ_STATE_MAX 4
816dec7efaSHans Petter Selasky };
826dec7efaSHans Petter Selasky
838d59ecb2SHans Petter Selasky struct linux_file {
848d59ecb2SHans Petter Selasky struct file *_file;
858d59ecb2SHans Petter Selasky const struct file_operations *f_op;
868d59ecb2SHans Petter Selasky void *private_data;
878d59ecb2SHans Petter Selasky int f_flags;
888d59ecb2SHans Petter Selasky int f_mode; /* Just starting mode. */
898d59ecb2SHans Petter Selasky struct dentry *f_dentry;
908d59ecb2SHans Petter Selasky struct dentry f_dentry_store;
918d59ecb2SHans Petter Selasky struct selinfo f_selinfo;
928d59ecb2SHans Petter Selasky struct sigio *f_sigio;
938d59ecb2SHans Petter Selasky struct vnode *f_vnode;
94dac6b88aSMark Johnston #define f_inode f_vnode
95f5a9867bSHans Petter Selasky volatile u_int f_count;
96a6b28ee0SHans Petter Selasky
97dac6b88aSMark Johnston /* anonymous shmem object */
98dac6b88aSMark Johnston vm_object_t f_shmem;
99dac6b88aSMark Johnston
100a6b28ee0SHans Petter Selasky /* kqfilter support */
101a6b28ee0SHans Petter Selasky int f_kqflags;
102a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_HAS_READ (1 << 0)
103a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_HAS_WRITE (1 << 1)
104a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_NEED_READ (1 << 2)
105a6b28ee0SHans Petter Selasky #define LINUX_KQ_FLAG_NEED_WRITE (1 << 3)
106a6b28ee0SHans Petter Selasky /* protects f_selinfo.si_note */
107a6b28ee0SHans Petter Selasky spinlock_t f_kqlock;
1086dec7efaSHans Petter Selasky struct linux_file_wait_queue f_wait_queue;
1099c7b53ccSSlava Shwartsman
1109c7b53ccSSlava Shwartsman /* pointer to associated character device, if any */
1119c7b53ccSSlava Shwartsman struct linux_cdev *f_cdev;
112a81b36c6SVladimir Kondratyev
113a81b36c6SVladimir Kondratyev struct rcu_head rcu;
1148d59ecb2SHans Petter Selasky };
1158d59ecb2SHans Petter Selasky
1168d59ecb2SHans Petter Selasky #define file linux_file
1178d59ecb2SHans Petter Selasky #define fasync_struct sigio *
1188d59ecb2SHans Petter Selasky
1198d59ecb2SHans Petter Selasky #define fasync_helper(fd, filp, on, queue) \
1208d59ecb2SHans Petter Selasky ({ \
1218d59ecb2SHans Petter Selasky if ((on)) \
1228d59ecb2SHans Petter Selasky *(queue) = &(filp)->f_sigio; \
1238d59ecb2SHans Petter Selasky else \
1248d59ecb2SHans Petter Selasky *(queue) = NULL; \
1258d59ecb2SHans Petter Selasky 0; \
1268d59ecb2SHans Petter Selasky })
1278d59ecb2SHans Petter Selasky
1288d59ecb2SHans Petter Selasky #define kill_fasync(queue, sig, pollstat) \
1298d59ecb2SHans Petter Selasky do { \
1308d59ecb2SHans Petter Selasky if (*(queue) != NULL) \
1318d59ecb2SHans Petter Selasky pgsigio(*(queue), (sig), 0); \
1328d59ecb2SHans Petter Selasky } while (0)
1338d59ecb2SHans Petter Selasky
1342ce1771cSMatt Macy typedef int (*filldir_t)(void *, const char *, int, off_t, u64, unsigned);
1358d59ecb2SHans Petter Selasky
1368d59ecb2SHans Petter Selasky struct file_operations {
1378d59ecb2SHans Petter Selasky struct module *owner;
1382ce1771cSMatt Macy ssize_t (*read)(struct linux_file *, char __user *, size_t, off_t *);
1392ce1771cSMatt Macy ssize_t (*write)(struct linux_file *, const char __user *, size_t, off_t *);
1402ce1771cSMatt Macy unsigned int (*poll) (struct linux_file *, struct poll_table_struct *);
1412ce1771cSMatt Macy long (*unlocked_ioctl)(struct linux_file *, unsigned int, unsigned long);
1422ce1771cSMatt Macy long (*compat_ioctl)(struct linux_file *, unsigned int, unsigned long);
1432ce1771cSMatt Macy int (*mmap)(struct linux_file *, struct vm_area_struct *);
1448d59ecb2SHans Petter Selasky int (*open)(struct inode *, struct file *);
1452ce1771cSMatt Macy int (*release)(struct inode *, struct linux_file *);
1462ce1771cSMatt Macy int (*fasync)(int, struct linux_file *, int);
1478d59ecb2SHans Petter Selasky
1488d59ecb2SHans Petter Selasky /* Although not supported in FreeBSD, to align with Linux code
1498d59ecb2SHans Petter Selasky * we are adding llseek() only when it is mapped to no_llseek which returns
1508d59ecb2SHans Petter Selasky * an illegal seek error
1518d59ecb2SHans Petter Selasky */
1522ce1771cSMatt Macy off_t (*llseek)(struct linux_file *, off_t, int);
1538d59ecb2SHans Petter Selasky #if 0
1548d59ecb2SHans Petter Selasky /* We do not support these methods. Don't permit them to compile. */
1558d59ecb2SHans Petter Selasky loff_t (*llseek)(struct file *, loff_t, int);
1568d59ecb2SHans Petter Selasky ssize_t (*aio_read)(struct kiocb *, const struct iovec *,
1578d59ecb2SHans Petter Selasky unsigned long, loff_t);
1588d59ecb2SHans Petter Selasky ssize_t (*aio_write)(struct kiocb *, const struct iovec *,
1598d59ecb2SHans Petter Selasky unsigned long, loff_t);
1608d59ecb2SHans Petter Selasky int (*readdir)(struct file *, void *, filldir_t);
1618d59ecb2SHans Petter Selasky int (*ioctl)(struct inode *, struct file *, unsigned int,
1628d59ecb2SHans Petter Selasky unsigned long);
1638d59ecb2SHans Petter Selasky int (*flush)(struct file *, fl_owner_t id);
1648d59ecb2SHans Petter Selasky int (*fsync)(struct file *, struct dentry *, int datasync);
1658d59ecb2SHans Petter Selasky int (*aio_fsync)(struct kiocb *, int datasync);
1668d59ecb2SHans Petter Selasky int (*lock)(struct file *, int, struct file_lock *);
1678d59ecb2SHans Petter Selasky ssize_t (*sendpage)(struct file *, struct page *, int, size_t,
1688d59ecb2SHans Petter Selasky loff_t *, int);
1698d59ecb2SHans Petter Selasky unsigned long (*get_unmapped_area)(struct file *, unsigned long,
1708d59ecb2SHans Petter Selasky unsigned long, unsigned long, unsigned long);
1718d59ecb2SHans Petter Selasky int (*check_flags)(int);
1728d59ecb2SHans Petter Selasky int (*flock)(struct file *, int, struct file_lock *);
1738d59ecb2SHans Petter Selasky ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
1748d59ecb2SHans Petter Selasky loff_t *, size_t, unsigned int);
1758d59ecb2SHans Petter Selasky ssize_t (*splice_read)(struct file *, loff_t *,
1768d59ecb2SHans Petter Selasky struct pipe_inode_info *, size_t, unsigned int);
1778d59ecb2SHans Petter Selasky int (*setlease)(struct file *, long, struct file_lock **);
1788d59ecb2SHans Petter Selasky #endif
1798d59ecb2SHans Petter Selasky };
1808d59ecb2SHans Petter Selasky #define fops_get(fops) (fops)
181dac6b88aSMark Johnston #define replace_fops(f, fops) ((f)->f_op = (fops))
1828d59ecb2SHans Petter Selasky
1838d59ecb2SHans Petter Selasky #define FMODE_READ FREAD
1848d59ecb2SHans Petter Selasky #define FMODE_WRITE FWRITE
1858d59ecb2SHans Petter Selasky #define FMODE_EXEC FEXEC
186a91b408aSEmmanuel Vadot #define FMODE_UNSIGNED_OFFSET 0x2000
1871125dbc0SHans Petter Selasky int __register_chrdev(unsigned int major, unsigned int baseminor,
1881125dbc0SHans Petter Selasky unsigned int count, const char *name,
1891125dbc0SHans Petter Selasky const struct file_operations *fops);
1901125dbc0SHans Petter Selasky int __register_chrdev_p(unsigned int major, unsigned int baseminor,
1911125dbc0SHans Petter Selasky unsigned int count, const char *name,
1921125dbc0SHans Petter Selasky const struct file_operations *fops, uid_t uid,
1931125dbc0SHans Petter Selasky gid_t gid, int mode);
1941125dbc0SHans Petter Selasky void __unregister_chrdev(unsigned int major, unsigned int baseminor,
1951125dbc0SHans Petter Selasky unsigned int count, const char *name);
1961125dbc0SHans Petter Selasky
1971125dbc0SHans Petter Selasky static inline void
unregister_chrdev(unsigned int major,const char * name)1981125dbc0SHans Petter Selasky unregister_chrdev(unsigned int major, const char *name)
1991125dbc0SHans Petter Selasky {
2001125dbc0SHans Petter Selasky
2011125dbc0SHans Petter Selasky __unregister_chrdev(major, 0, 256, name);
2021125dbc0SHans Petter Selasky }
2031125dbc0SHans Petter Selasky
2041125dbc0SHans Petter Selasky static inline int
register_chrdev(unsigned int major,const char * name,const struct file_operations * fops)2051125dbc0SHans Petter Selasky register_chrdev(unsigned int major, const char *name,
2061125dbc0SHans Petter Selasky const struct file_operations *fops)
2071125dbc0SHans Petter Selasky {
2081125dbc0SHans Petter Selasky
2091125dbc0SHans Petter Selasky return (__register_chrdev(major, 0, 256, name, fops));
2101125dbc0SHans Petter Selasky }
2111125dbc0SHans Petter Selasky
2121125dbc0SHans Petter Selasky static inline int
register_chrdev_p(unsigned int major,const char * name,const struct file_operations * fops,uid_t uid,gid_t gid,int mode)2131125dbc0SHans Petter Selasky register_chrdev_p(unsigned int major, const char *name,
2141125dbc0SHans Petter Selasky const struct file_operations *fops, uid_t uid, gid_t gid, int mode)
2151125dbc0SHans Petter Selasky {
2161125dbc0SHans Petter Selasky
2171125dbc0SHans Petter Selasky return (__register_chrdev_p(major, 0, 256, name, fops, uid, gid, mode));
2181125dbc0SHans Petter Selasky }
2191125dbc0SHans Petter Selasky
2208d59ecb2SHans Petter Selasky static inline int
register_chrdev_region(dev_t dev,unsigned range,const char * name)2218d59ecb2SHans Petter Selasky register_chrdev_region(dev_t dev, unsigned range, const char *name)
2228d59ecb2SHans Petter Selasky {
2238d59ecb2SHans Petter Selasky
2248d59ecb2SHans Petter Selasky return 0;
2258d59ecb2SHans Petter Selasky }
2268d59ecb2SHans Petter Selasky
2278d59ecb2SHans Petter Selasky static inline void
unregister_chrdev_region(dev_t dev,unsigned range)2288d59ecb2SHans Petter Selasky unregister_chrdev_region(dev_t dev, unsigned range)
2298d59ecb2SHans Petter Selasky {
2308d59ecb2SHans Petter Selasky
2318d59ecb2SHans Petter Selasky return;
2328d59ecb2SHans Petter Selasky }
2338d59ecb2SHans Petter Selasky
2348d59ecb2SHans Petter Selasky static inline int
alloc_chrdev_region(dev_t * dev,unsigned baseminor,unsigned count,const char * name)2358d59ecb2SHans Petter Selasky alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
2368d59ecb2SHans Petter Selasky const char *name)
2378d59ecb2SHans Petter Selasky {
2388d59ecb2SHans Petter Selasky
2398d59ecb2SHans Petter Selasky return 0;
2408d59ecb2SHans Petter Selasky }
2418d59ecb2SHans Petter Selasky
2428d59ecb2SHans Petter Selasky /* No current support for seek op in FreeBSD */
2438d59ecb2SHans Petter Selasky static inline int
nonseekable_open(struct inode * inode,struct file * filp)2448d59ecb2SHans Petter Selasky nonseekable_open(struct inode *inode, struct file *filp)
2458d59ecb2SHans Petter Selasky {
2468d59ecb2SHans Petter Selasky return 0;
2478d59ecb2SHans Petter Selasky }
2488d59ecb2SHans Petter Selasky
24941dee251SBjoern A. Zeeb static inline int
simple_open(struct inode * inode,struct file * filp)25041dee251SBjoern A. Zeeb simple_open(struct inode *inode, struct file *filp)
25141dee251SBjoern A. Zeeb {
252f697b943SJake Freeland filp->private_data = inode->i_private;
25341dee251SBjoern A. Zeeb return 0;
25441dee251SBjoern A. Zeeb }
25541dee251SBjoern A. Zeeb
2562b79a966SHans Petter Selasky extern unsigned int linux_iminor(struct inode *);
2572b79a966SHans Petter Selasky #define iminor(...) linux_iminor(__VA_ARGS__)
2588d59ecb2SHans Petter Selasky
259f5a9867bSHans Petter Selasky static inline struct linux_file *
get_file(struct linux_file * f)260f5a9867bSHans Petter Selasky get_file(struct linux_file *f)
261f5a9867bSHans Petter Selasky {
262f5a9867bSHans Petter Selasky
263f5a9867bSHans Petter Selasky refcount_acquire(f->_file == NULL ? &f->f_count : &f->_file->f_count);
264f5a9867bSHans Petter Selasky return (f);
265f5a9867bSHans Petter Selasky }
266f5a9867bSHans Petter Selasky
267a81b36c6SVladimir Kondratyev static inline bool
get_file_rcu(struct linux_file * f)268a81b36c6SVladimir Kondratyev get_file_rcu(struct linux_file *f)
269a81b36c6SVladimir Kondratyev {
270a81b36c6SVladimir Kondratyev return (refcount_acquire_if_not_zero(
271a81b36c6SVladimir Kondratyev f->_file == NULL ? &f->f_count : &f->_file->f_count));
272a81b36c6SVladimir Kondratyev }
273a81b36c6SVladimir Kondratyev
2748d59ecb2SHans Petter Selasky static inline struct inode *
igrab(struct inode * inode)2758d59ecb2SHans Petter Selasky igrab(struct inode *inode)
2768d59ecb2SHans Petter Selasky {
2778d59ecb2SHans Petter Selasky int error;
2788d59ecb2SHans Petter Selasky
279a92a971bSMateusz Guzik error = vget(inode, 0);
2808d59ecb2SHans Petter Selasky if (error)
2818d59ecb2SHans Petter Selasky return (NULL);
2828d59ecb2SHans Petter Selasky
2838d59ecb2SHans Petter Selasky return (inode);
2848d59ecb2SHans Petter Selasky }
2858d59ecb2SHans Petter Selasky
2868d59ecb2SHans Petter Selasky static inline void
iput(struct inode * inode)2878d59ecb2SHans Petter Selasky iput(struct inode *inode)
2888d59ecb2SHans Petter Selasky {
2898d59ecb2SHans Petter Selasky
2908d59ecb2SHans Petter Selasky vrele(inode);
2918d59ecb2SHans Petter Selasky }
2928d59ecb2SHans Petter Selasky
2938d59ecb2SHans Petter Selasky static inline loff_t
no_llseek(struct file * file,loff_t offset,int whence)2948d59ecb2SHans Petter Selasky no_llseek(struct file *file, loff_t offset, int whence)
2958d59ecb2SHans Petter Selasky {
2964eb1bcfcSMark Johnston
2974eb1bcfcSMark Johnston return (-ESPIPE);
2984eb1bcfcSMark Johnston }
2994eb1bcfcSMark Johnston
3004eb1bcfcSMark Johnston static inline loff_t
default_llseek(struct file * file,loff_t offset,int whence)301f697b943SJake Freeland default_llseek(struct file *file, loff_t offset, int whence)
302f697b943SJake Freeland {
303f697b943SJake Freeland return (no_llseek(file, offset, whence));
304f697b943SJake Freeland }
305f697b943SJake Freeland
306f697b943SJake Freeland static inline loff_t
generic_file_llseek(struct file * file,loff_t offset,int whence)307af393426SBjoern A. Zeeb generic_file_llseek(struct file *file, loff_t offset, int whence)
308af393426SBjoern A. Zeeb {
309af393426SBjoern A. Zeeb return (no_llseek(file, offset, whence));
310af393426SBjoern A. Zeeb }
311af393426SBjoern A. Zeeb
312af393426SBjoern A. Zeeb static inline loff_t
noop_llseek(struct linux_file * file,loff_t offset,int whence)3134eb1bcfcSMark Johnston noop_llseek(struct linux_file *file, loff_t offset, int whence)
3144eb1bcfcSMark Johnston {
3154eb1bcfcSMark Johnston
3164eb1bcfcSMark Johnston return (file->_file->f_offset);
3178d59ecb2SHans Petter Selasky }
3188d59ecb2SHans Petter Selasky
319d51be359SHans Petter Selasky static inline struct vnode *
file_inode(const struct linux_file * file)320d51be359SHans Petter Selasky file_inode(const struct linux_file *file)
321d51be359SHans Petter Selasky {
322d51be359SHans Petter Selasky
323d51be359SHans Petter Selasky return (file->f_vnode);
324d51be359SHans Petter Selasky }
325d51be359SHans Petter Selasky
326d51be359SHans Petter Selasky static inline int
call_mmap(struct linux_file * file,struct vm_area_struct * vma)327d51be359SHans Petter Selasky call_mmap(struct linux_file *file, struct vm_area_struct *vma)
328d51be359SHans Petter Selasky {
329d51be359SHans Petter Selasky
330d51be359SHans Petter Selasky return (file->f_op->mmap(file, vma));
331d51be359SHans Petter Selasky }
332d51be359SHans Petter Selasky
333f697b943SJake Freeland static inline void
i_size_write(struct inode * inode,loff_t i_size)334f697b943SJake Freeland i_size_write(struct inode *inode, loff_t i_size)
335f697b943SJake Freeland {
336f697b943SJake Freeland }
337f697b943SJake Freeland
338f697b943SJake Freeland /*
339f697b943SJake Freeland * simple_read_from_buffer: copy data from kernel-space origin
340f697b943SJake Freeland * buffer into user-space destination buffer
341f697b943SJake Freeland *
342f697b943SJake Freeland * @dest: destination buffer
343f697b943SJake Freeland * @read_size: number of bytes to be transferred
344f697b943SJake Freeland * @ppos: starting transfer position pointer
345f697b943SJake Freeland * @orig: origin buffer
346f697b943SJake Freeland * @buf_size: size of destination and origin buffers
347f697b943SJake Freeland *
348f697b943SJake Freeland * Return value:
349f697b943SJake Freeland * On success, total bytes copied with *ppos incremented accordingly.
350f697b943SJake Freeland * On failure, negative value.
351f697b943SJake Freeland */
352f697b943SJake Freeland static inline ssize_t
simple_read_from_buffer(void __user * dest,size_t read_size,loff_t * ppos,void * orig,size_t buf_size)353f697b943SJake Freeland simple_read_from_buffer(void __user *dest, size_t read_size, loff_t *ppos,
354f697b943SJake Freeland void *orig, size_t buf_size)
355f697b943SJake Freeland {
356f697b943SJake Freeland void *read_pos = ((char *) orig) + *ppos;
357f697b943SJake Freeland size_t buf_remain = buf_size - *ppos;
358f697b943SJake Freeland ssize_t num_read;
359f697b943SJake Freeland
360f697b943SJake Freeland if (buf_remain < 0 || buf_remain > buf_size)
361f697b943SJake Freeland return -EINVAL;
362f697b943SJake Freeland
363f697b943SJake Freeland if (read_size > buf_remain)
364f697b943SJake Freeland read_size = buf_remain;
365f697b943SJake Freeland
366f697b943SJake Freeland /* copy_to_user returns number of bytes NOT read */
367f697b943SJake Freeland num_read = read_size - copy_to_user(dest, read_pos, read_size);
368f697b943SJake Freeland if (num_read == 0)
369f697b943SJake Freeland return -EFAULT;
370f697b943SJake Freeland *ppos += num_read;
371f697b943SJake Freeland
372f697b943SJake Freeland return (num_read);
373f697b943SJake Freeland }
374f697b943SJake Freeland
375f697b943SJake Freeland MALLOC_DECLARE(M_LSATTR);
376f697b943SJake Freeland
377f697b943SJake Freeland #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
378f697b943SJake Freeland static inline int \
379f697b943SJake Freeland __fops ## _open(struct inode *inode, struct file *filp) \
380f697b943SJake Freeland { \
381f697b943SJake Freeland return (simple_attr_open(inode, filp, __get, __set, __fmt)); \
382f697b943SJake Freeland } \
383f697b943SJake Freeland static const struct file_operations __fops = { \
384f697b943SJake Freeland .owner = THIS_MODULE, \
385f697b943SJake Freeland .open = __fops ## _open, \
386f697b943SJake Freeland .release = simple_attr_release, \
387f697b943SJake Freeland .read = simple_attr_read, \
388f697b943SJake Freeland .write = simple_attr_write, \
389f697b943SJake Freeland .llseek = no_llseek \
390f697b943SJake Freeland }
391f697b943SJake Freeland
392f697b943SJake Freeland int simple_attr_open(struct inode *inode, struct file *filp,
393f697b943SJake Freeland int (*get)(void *, uint64_t *), int (*set)(void *, uint64_t),
394f697b943SJake Freeland const char *fmt);
395f697b943SJake Freeland
396f697b943SJake Freeland int simple_attr_release(struct inode *inode, struct file *filp);
397f697b943SJake Freeland
398f697b943SJake Freeland ssize_t simple_attr_read(struct file *filp, char *buf, size_t read_size, loff_t *ppos);
399f697b943SJake Freeland
400f697b943SJake Freeland ssize_t simple_attr_write(struct file *filp, const char *buf, size_t write_size, loff_t *ppos);
401f697b943SJake Freeland
402307f78f3SVladimir Kondratyev #endif /* _LINUXKPI_LINUX_FS_H_ */
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