Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/read_write.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/stat.h> |
| 9 | #include <linux/fcntl.h> |
| 10 | #include <linux/file.h> |
| 11 | #include <linux/uio.h> |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 12 | #include <linux/aio.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 13 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/security.h> |
Paul Gortmaker | 630d9c4 | 2011-11-16 23:57:37 -0500 | [diff] [blame] | 15 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/syscalls.h> |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 17 | #include <linux/pagemap.h> |
Jens Axboe | d6b29d7 | 2007-06-04 09:59:47 +0200 | [diff] [blame] | 18 | #include <linux/splice.h> |
Al Viro | 561c673 | 2013-02-24 10:52:26 -0500 | [diff] [blame] | 19 | #include <linux/compat.h> |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 20 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <asm/uaccess.h> |
| 23 | #include <asm/unistd.h> |
| 24 | |
Al Viro | c0bd14af | 2013-05-04 15:00:54 -0400 | [diff] [blame] | 25 | typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
| 26 | typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *, |
| 27 | unsigned long, loff_t); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 28 | typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); |
Al Viro | c0bd14af | 2013-05-04 15:00:54 -0400 | [diff] [blame] | 29 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 30 | const struct file_operations generic_ro_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | .llseek = generic_file_llseek, |
Al Viro | aad4f8b | 2014-04-02 14:33:16 -0400 | [diff] [blame] | 32 | .read = new_sync_read, |
| 33 | .read_iter = generic_file_read_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | .mmap = generic_file_readonly_mmap, |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 35 | .splice_read = generic_file_splice_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | EXPORT_SYMBOL(generic_ro_fops); |
| 39 | |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 40 | static inline int unsigned_offsets(struct file *file) |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 41 | { |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 42 | return file->f_mode & FMODE_UNSIGNED_OFFSET; |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 43 | } |
| 44 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 45 | /** |
| 46 | * vfs_setpos - update the file offset for lseek |
| 47 | * @file: file structure in question |
| 48 | * @offset: file offset to seek to |
| 49 | * @maxsize: maximum file size |
| 50 | * |
| 51 | * This is a low-level filesystem helper for updating the file offset to |
| 52 | * the value specified by @offset if the given offset is valid and it is |
| 53 | * not equal to the current file offset. |
| 54 | * |
| 55 | * Return the specified offset on success and -EINVAL on invalid offset. |
| 56 | */ |
| 57 | loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 58 | { |
| 59 | if (offset < 0 && !unsigned_offsets(file)) |
| 60 | return -EINVAL; |
| 61 | if (offset > maxsize) |
| 62 | return -EINVAL; |
| 63 | |
| 64 | if (offset != file->f_pos) { |
| 65 | file->f_pos = offset; |
| 66 | file->f_version = 0; |
| 67 | } |
| 68 | return offset; |
| 69 | } |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 70 | EXPORT_SYMBOL(vfs_setpos); |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 71 | |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 72 | /** |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 73 | * generic_file_llseek_size - generic llseek implementation for regular files |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 74 | * @file: file structure to seek on |
| 75 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 76 | * @whence: type of seek |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 77 | * @size: max size of this file in file system |
| 78 | * @eof: offset used for SEEK_END position |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 79 | * |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 80 | * This is a variant of generic_file_llseek that allows passing in a custom |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 81 | * maximum file size and a custom EOF position, for e.g. hashed directories |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 82 | * |
| 83 | * Synchronization: |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 84 | * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 85 | * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. |
| 86 | * read/writes behave like SEEK_SET against seeks. |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 87 | */ |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 88 | loff_t |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 89 | generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 90 | loff_t maxsize, loff_t eof) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 92 | switch (whence) { |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 93 | case SEEK_END: |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 94 | offset += eof; |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 95 | break; |
| 96 | case SEEK_CUR: |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 97 | /* |
| 98 | * Here we special-case the lseek(fd, 0, SEEK_CUR) |
| 99 | * position-querying operation. Avoid rewriting the "same" |
| 100 | * f_pos value back to the file because a concurrent read(), |
| 101 | * write() or lseek() might have altered it |
| 102 | */ |
| 103 | if (offset == 0) |
| 104 | return file->f_pos; |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 105 | /* |
| 106 | * f_lock protects against read/modify/write race with other |
| 107 | * SEEK_CURs. Note that parallel writes and reads behave |
| 108 | * like SEEK_SET. |
| 109 | */ |
| 110 | spin_lock(&file->f_lock); |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 111 | offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 112 | spin_unlock(&file->f_lock); |
| 113 | return offset; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 114 | case SEEK_DATA: |
| 115 | /* |
| 116 | * In the generic case the entire file is data, so as long as |
| 117 | * offset isn't at the end of the file then the offset is data. |
| 118 | */ |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 119 | if (offset >= eof) |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 120 | return -ENXIO; |
| 121 | break; |
| 122 | case SEEK_HOLE: |
| 123 | /* |
| 124 | * There is a virtual hole at the end of the file, so as long as |
| 125 | * offset isn't i_size or larger, return i_size. |
| 126 | */ |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 127 | if (offset >= eof) |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 128 | return -ENXIO; |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 129 | offset = eof; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 130 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 132 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 133 | return vfs_setpos(file, offset, maxsize); |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 134 | } |
| 135 | EXPORT_SYMBOL(generic_file_llseek_size); |
| 136 | |
| 137 | /** |
| 138 | * generic_file_llseek - generic llseek implementation for regular files |
| 139 | * @file: file structure to seek on |
| 140 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 141 | * @whence: type of seek |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 142 | * |
| 143 | * This is a generic implemenation of ->llseek useable for all normal local |
| 144 | * filesystems. It just updates the file offset to the value specified by |
Ming Lei | 546ae2d | 2013-04-29 15:06:07 -0700 | [diff] [blame] | 145 | * @offset and @whence. |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 146 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 147 | loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 148 | { |
| 149 | struct inode *inode = file->f_mapping->host; |
| 150 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 151 | return generic_file_llseek_size(file, offset, whence, |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 152 | inode->i_sb->s_maxbytes, |
| 153 | i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 155 | EXPORT_SYMBOL(generic_file_llseek); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 157 | /** |
Al Viro | 1bf9d14 | 2013-06-16 20:27:42 +0400 | [diff] [blame] | 158 | * fixed_size_llseek - llseek implementation for fixed-sized devices |
| 159 | * @file: file structure to seek on |
| 160 | * @offset: file offset to seek to |
| 161 | * @whence: type of seek |
| 162 | * @size: size of the file |
| 163 | * |
| 164 | */ |
| 165 | loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) |
| 166 | { |
| 167 | switch (whence) { |
| 168 | case SEEK_SET: case SEEK_CUR: case SEEK_END: |
| 169 | return generic_file_llseek_size(file, offset, whence, |
| 170 | size, size); |
| 171 | default: |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | } |
| 175 | EXPORT_SYMBOL(fixed_size_llseek); |
| 176 | |
| 177 | /** |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 178 | * noop_llseek - No Operation Performed llseek implementation |
| 179 | * @file: file structure to seek on |
| 180 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 181 | * @whence: type of seek |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 182 | * |
| 183 | * This is an implementation of ->llseek useable for the rare special case when |
| 184 | * userspace expects the seek to succeed but the (device) file is actually not |
| 185 | * able to perform the seek. In this case you use noop_llseek() instead of |
| 186 | * falling back to the default implementation of ->llseek. |
| 187 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 188 | loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 189 | { |
| 190 | return file->f_pos; |
| 191 | } |
| 192 | EXPORT_SYMBOL(noop_llseek); |
| 193 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 194 | loff_t no_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
| 196 | return -ESPIPE; |
| 197 | } |
| 198 | EXPORT_SYMBOL(no_llseek); |
| 199 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 200 | loff_t default_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 202 | struct inode *inode = file_inode(file); |
David Sterba | 16abef0 | 2008-04-22 15:09:22 +0200 | [diff] [blame] | 203 | loff_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 205 | mutex_lock(&inode->i_mutex); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 206 | switch (whence) { |
Chris Snook | 7b8e892 | 2007-05-08 00:24:13 -0700 | [diff] [blame] | 207 | case SEEK_END: |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 208 | offset += i_size_read(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | break; |
Chris Snook | 7b8e892 | 2007-05-08 00:24:13 -0700 | [diff] [blame] | 210 | case SEEK_CUR: |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 211 | if (offset == 0) { |
| 212 | retval = file->f_pos; |
| 213 | goto out; |
| 214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | offset += file->f_pos; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 216 | break; |
| 217 | case SEEK_DATA: |
| 218 | /* |
| 219 | * In the generic case the entire file is data, so as |
| 220 | * long as offset isn't at the end of the file then the |
| 221 | * offset is data. |
| 222 | */ |
Dan Carpenter | bacb2d8 | 2011-07-26 17:25:20 +0300 | [diff] [blame] | 223 | if (offset >= inode->i_size) { |
| 224 | retval = -ENXIO; |
| 225 | goto out; |
| 226 | } |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 227 | break; |
| 228 | case SEEK_HOLE: |
| 229 | /* |
| 230 | * There is a virtual hole at the end of the file, so |
| 231 | * as long as offset isn't i_size or larger, return |
| 232 | * i_size. |
| 233 | */ |
Dan Carpenter | bacb2d8 | 2011-07-26 17:25:20 +0300 | [diff] [blame] | 234 | if (offset >= inode->i_size) { |
| 235 | retval = -ENXIO; |
| 236 | goto out; |
| 237 | } |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 238 | offset = inode->i_size; |
| 239 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | } |
| 241 | retval = -EINVAL; |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 242 | if (offset >= 0 || unsigned_offsets(file)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (offset != file->f_pos) { |
| 244 | file->f_pos = offset; |
| 245 | file->f_version = 0; |
| 246 | } |
| 247 | retval = offset; |
| 248 | } |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 249 | out: |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 250 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | return retval; |
| 252 | } |
| 253 | EXPORT_SYMBOL(default_llseek); |
| 254 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 255 | loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
| 257 | loff_t (*fn)(struct file *, loff_t, int); |
| 258 | |
| 259 | fn = no_llseek; |
| 260 | if (file->f_mode & FMODE_LSEEK) { |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 261 | if (file->f_op->llseek) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | fn = file->f_op->llseek; |
| 263 | } |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 264 | return fn(file, offset, whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | EXPORT_SYMBOL(vfs_llseek); |
| 267 | |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 268 | static inline struct fd fdget_pos(int fd) |
| 269 | { |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 270 | return __to_fd(__fdget_pos(fd)); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | static inline void fdput_pos(struct fd f) |
| 274 | { |
| 275 | if (f.flags & FDPUT_POS_UNLOCK) |
| 276 | mutex_unlock(&f.file->f_pos_lock); |
| 277 | fdput(f); |
| 278 | } |
| 279 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 280 | SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
| 282 | off_t retval; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 283 | struct fd f = fdget_pos(fd); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 284 | if (!f.file) |
| 285 | return -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | retval = -EINVAL; |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 288 | if (whence <= SEEK_MAX) { |
| 289 | loff_t res = vfs_llseek(f.file, offset, whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | retval = res; |
| 291 | if (res != (loff_t)retval) |
| 292 | retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ |
| 293 | } |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 294 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | return retval; |
| 296 | } |
| 297 | |
Al Viro | 561c673 | 2013-02-24 10:52:26 -0500 | [diff] [blame] | 298 | #ifdef CONFIG_COMPAT |
| 299 | COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) |
| 300 | { |
| 301 | return sys_lseek(fd, offset, whence); |
| 302 | } |
| 303 | #endif |
| 304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | #ifdef __ARCH_WANT_SYS_LLSEEK |
Heiko Carstens | 003d7ab | 2009-01-14 14:14:21 +0100 | [diff] [blame] | 306 | SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, |
| 307 | unsigned long, offset_low, loff_t __user *, result, |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 308 | unsigned int, whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
| 310 | int retval; |
Eric Biggers | d7a15f8 | 2014-03-16 14:24:08 -0500 | [diff] [blame] | 311 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | loff_t offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 314 | if (!f.file) |
| 315 | return -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | retval = -EINVAL; |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 318 | if (whence > SEEK_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | goto out_putf; |
| 320 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 321 | offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 322 | whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | retval = (int)offset; |
| 325 | if (offset >= 0) { |
| 326 | retval = -EFAULT; |
| 327 | if (!copy_to_user(result, &offset, sizeof(offset))) |
| 328 | retval = 0; |
| 329 | } |
| 330 | out_putf: |
Eric Biggers | d7a15f8 | 2014-03-16 14:24:08 -0500 | [diff] [blame] | 331 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | return retval; |
| 333 | } |
| 334 | #endif |
| 335 | |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 336 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos) |
| 337 | { |
| 338 | struct kiocb kiocb; |
| 339 | ssize_t ret; |
| 340 | |
| 341 | if (!file->f_op->read_iter) |
| 342 | return -EINVAL; |
| 343 | |
| 344 | init_sync_kiocb(&kiocb, file); |
| 345 | kiocb.ki_pos = *ppos; |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 346 | |
| 347 | iter->type |= READ; |
| 348 | ret = file->f_op->read_iter(&kiocb, iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 349 | BUG_ON(ret == -EIOCBQUEUED); |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 350 | if (ret > 0) |
| 351 | *ppos = kiocb.ki_pos; |
| 352 | return ret; |
| 353 | } |
| 354 | EXPORT_SYMBOL(vfs_iter_read); |
| 355 | |
| 356 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos) |
| 357 | { |
| 358 | struct kiocb kiocb; |
| 359 | ssize_t ret; |
| 360 | |
| 361 | if (!file->f_op->write_iter) |
| 362 | return -EINVAL; |
| 363 | |
| 364 | init_sync_kiocb(&kiocb, file); |
| 365 | kiocb.ki_pos = *ppos; |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 366 | |
| 367 | iter->type |= WRITE; |
| 368 | ret = file->f_op->write_iter(&kiocb, iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 369 | BUG_ON(ret == -EIOCBQUEUED); |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 370 | if (ret > 0) |
| 371 | *ppos = kiocb.ki_pos; |
| 372 | return ret; |
| 373 | } |
| 374 | EXPORT_SYMBOL(vfs_iter_write); |
| 375 | |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 376 | /* |
| 377 | * rw_verify_area doesn't like huge counts. We limit |
| 378 | * them to something that fits in "int" so that others |
| 379 | * won't have to do range checks all the time. |
| 380 | */ |
Al Viro | 68d70d0 | 2013-06-19 15:26:04 +0400 | [diff] [blame] | 381 | int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
| 383 | struct inode *inode; |
| 384 | loff_t pos; |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 385 | int retval = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 387 | inode = file_inode(file); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 388 | if (unlikely((ssize_t) count < 0)) |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 389 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | pos = *ppos; |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 391 | if (unlikely(pos < 0)) { |
| 392 | if (!unsigned_offsets(file)) |
| 393 | return retval; |
| 394 | if (count >= -pos) /* both values are in 0..LLONG_MAX */ |
| 395 | return -EOVERFLOW; |
| 396 | } else if (unlikely((loff_t) (pos + count) < 0)) { |
| 397 | if (!unsigned_offsets(file)) |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 398 | return retval; |
| 399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 401 | if (unlikely(inode->i_flctx && mandatory_lock(inode))) { |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 402 | retval = locks_mandatory_area( |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 403 | read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, |
| 404 | inode, file, pos, count); |
| 405 | if (retval < 0) |
| 406 | return retval; |
| 407 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 408 | retval = security_file_permission(file, |
| 409 | read_write == READ ? MAY_READ : MAY_WRITE); |
| 410 | if (retval) |
| 411 | return retval; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 412 | return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
| 416 | { |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 417 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct kiocb kiocb; |
| 419 | ssize_t ret; |
| 420 | |
| 421 | init_sync_kiocb(&kiocb, filp); |
| 422 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 423 | |
Zach Brown | 41003a7 | 2013-05-07 16:18:25 -0700 | [diff] [blame] | 424 | ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 425 | BUG_ON(ret == -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | *ppos = kiocb.ki_pos; |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | EXPORT_SYMBOL(do_sync_read); |
| 431 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 432 | ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
| 433 | { |
| 434 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
| 435 | struct kiocb kiocb; |
| 436 | struct iov_iter iter; |
| 437 | ssize_t ret; |
| 438 | |
| 439 | init_sync_kiocb(&kiocb, filp); |
| 440 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 441 | iov_iter_init(&iter, READ, &iov, 1, len); |
| 442 | |
| 443 | ret = filp->f_op->read_iter(&kiocb, &iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 444 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 445 | *ppos = kiocb.ki_pos; |
| 446 | return ret; |
| 447 | } |
| 448 | |
| 449 | EXPORT_SYMBOL(new_sync_read); |
| 450 | |
Dmitry Kasatkin | 6fb5032 | 2014-11-05 17:01:17 +0200 | [diff] [blame] | 451 | ssize_t __vfs_read(struct file *file, char __user *buf, size_t count, |
| 452 | loff_t *pos) |
| 453 | { |
| 454 | ssize_t ret; |
| 455 | |
| 456 | if (file->f_op->read) |
| 457 | ret = file->f_op->read(file, buf, count, pos); |
| 458 | else if (file->f_op->aio_read) |
| 459 | ret = do_sync_read(file, buf, count, pos); |
| 460 | else if (file->f_op->read_iter) |
| 461 | ret = new_sync_read(file, buf, count, pos); |
| 462 | else |
| 463 | ret = -EINVAL; |
| 464 | |
| 465 | return ret; |
| 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
| 469 | { |
| 470 | ssize_t ret; |
| 471 | |
| 472 | if (!(file->f_mode & FMODE_READ)) |
| 473 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 474 | if (!(file->f_mode & FMODE_CAN_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | return -EINVAL; |
| 476 | if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) |
| 477 | return -EFAULT; |
| 478 | |
| 479 | ret = rw_verify_area(READ, file, pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 480 | if (ret >= 0) { |
| 481 | count = ret; |
Dmitry Kasatkin | 6fb5032 | 2014-11-05 17:01:17 +0200 | [diff] [blame] | 482 | ret = __vfs_read(file, buf, count, pos); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 483 | if (ret > 0) { |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 484 | fsnotify_access(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 485 | add_rchar(current, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 487 | inc_syscr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | EXPORT_SYMBOL(vfs_read); |
| 494 | |
| 495 | ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
| 496 | { |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 497 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | struct kiocb kiocb; |
| 499 | ssize_t ret; |
| 500 | |
| 501 | init_sync_kiocb(&kiocb, filp); |
| 502 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 503 | |
Zach Brown | 41003a7 | 2013-05-07 16:18:25 -0700 | [diff] [blame] | 504 | ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 505 | BUG_ON(ret == -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | *ppos = kiocb.ki_pos; |
| 507 | return ret; |
| 508 | } |
| 509 | |
| 510 | EXPORT_SYMBOL(do_sync_write); |
| 511 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 512 | ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
| 513 | { |
| 514 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
| 515 | struct kiocb kiocb; |
| 516 | struct iov_iter iter; |
| 517 | ssize_t ret; |
| 518 | |
| 519 | init_sync_kiocb(&kiocb, filp); |
| 520 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 521 | iov_iter_init(&iter, WRITE, &iov, 1, len); |
| 522 | |
| 523 | ret = filp->f_op->write_iter(&kiocb, &iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 524 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 525 | *ppos = kiocb.ki_pos; |
| 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | EXPORT_SYMBOL(new_sync_write); |
| 530 | |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 531 | ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) |
| 532 | { |
| 533 | mm_segment_t old_fs; |
| 534 | const char __user *p; |
| 535 | ssize_t ret; |
| 536 | |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 537 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Al Viro | 3e84f48 | 2013-03-27 15:20:30 +0000 | [diff] [blame] | 538 | return -EINVAL; |
| 539 | |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 540 | old_fs = get_fs(); |
| 541 | set_fs(get_ds()); |
| 542 | p = (__force const char __user *)buf; |
| 543 | if (count > MAX_RW_COUNT) |
| 544 | count = MAX_RW_COUNT; |
| 545 | if (file->f_op->write) |
| 546 | ret = file->f_op->write(file, p, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 547 | else if (file->f_op->aio_write) |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 548 | ret = do_sync_write(file, p, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 549 | else |
| 550 | ret = new_sync_write(file, p, count, pos); |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 551 | set_fs(old_fs); |
| 552 | if (ret > 0) { |
| 553 | fsnotify_modify(file); |
| 554 | add_wchar(current, ret); |
| 555 | } |
| 556 | inc_syscw(current); |
| 557 | return ret; |
| 558 | } |
| 559 | |
Al Viro | 2ec3a12 | 2014-08-19 11:48:09 -0400 | [diff] [blame] | 560 | EXPORT_SYMBOL(__kernel_write); |
| 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
| 563 | { |
| 564 | ssize_t ret; |
| 565 | |
| 566 | if (!(file->f_mode & FMODE_WRITE)) |
| 567 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 568 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | return -EINVAL; |
| 570 | if (unlikely(!access_ok(VERIFY_READ, buf, count))) |
| 571 | return -EFAULT; |
| 572 | |
| 573 | ret = rw_verify_area(WRITE, file, pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 574 | if (ret >= 0) { |
| 575 | count = ret; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 576 | file_start_write(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 577 | if (file->f_op->write) |
| 578 | ret = file->f_op->write(file, buf, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 579 | else if (file->f_op->aio_write) |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 580 | ret = do_sync_write(file, buf, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 581 | else |
| 582 | ret = new_sync_write(file, buf, count, pos); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 583 | if (ret > 0) { |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 584 | fsnotify_modify(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 585 | add_wchar(current, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 587 | inc_syscw(current); |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 588 | file_end_write(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | return ret; |
| 592 | } |
| 593 | |
| 594 | EXPORT_SYMBOL(vfs_write); |
| 595 | |
| 596 | static inline loff_t file_pos_read(struct file *file) |
| 597 | { |
| 598 | return file->f_pos; |
| 599 | } |
| 600 | |
| 601 | static inline void file_pos_write(struct file *file, loff_t pos) |
| 602 | { |
| 603 | file->f_pos = pos; |
| 604 | } |
| 605 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 606 | SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 608 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 611 | if (f.file) { |
| 612 | loff_t pos = file_pos_read(f.file); |
| 613 | ret = vfs_read(f.file, buf, count, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 614 | if (ret >= 0) |
| 615 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 616 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | return ret; |
| 619 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 621 | SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, |
| 622 | size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 624 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 627 | if (f.file) { |
| 628 | loff_t pos = file_pos_read(f.file); |
| 629 | ret = vfs_write(f.file, buf, count, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 630 | if (ret >= 0) |
| 631 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 632 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | return ret; |
| 636 | } |
| 637 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 638 | SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, |
| 639 | size_t, count, loff_t, pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 641 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
| 644 | if (pos < 0) |
| 645 | return -EINVAL; |
| 646 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 647 | f = fdget(fd); |
| 648 | if (f.file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 650 | if (f.file->f_mode & FMODE_PREAD) |
| 651 | ret = vfs_read(f.file, buf, count, &pos); |
| 652 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | return ret; |
| 656 | } |
| 657 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 658 | SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, |
| 659 | size_t, count, loff_t, pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 661 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
| 664 | if (pos < 0) |
| 665 | return -EINVAL; |
| 666 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 667 | f = fdget(fd); |
| 668 | if (f.file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 670 | if (f.file->f_mode & FMODE_PWRITE) |
| 671 | ret = vfs_write(f.file, buf, count, &pos); |
| 672 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Reduce an iovec's length in-place. Return the resulting number of segments |
| 680 | */ |
| 681 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) |
| 682 | { |
| 683 | unsigned long seg = 0; |
| 684 | size_t len = 0; |
| 685 | |
| 686 | while (seg < nr_segs) { |
| 687 | seg++; |
| 688 | if (len + iov->iov_len >= to) { |
| 689 | iov->iov_len = to - len; |
| 690 | break; |
| 691 | } |
| 692 | len += iov->iov_len; |
| 693 | iov++; |
| 694 | } |
| 695 | return seg; |
| 696 | } |
Eric Sandeen | 1929552 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 697 | EXPORT_SYMBOL(iov_shorten); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 699 | static ssize_t do_iter_readv_writev(struct file *filp, int rw, const struct iovec *iov, |
| 700 | unsigned long nr_segs, size_t len, loff_t *ppos, iter_fn_t fn) |
| 701 | { |
| 702 | struct kiocb kiocb; |
| 703 | struct iov_iter iter; |
| 704 | ssize_t ret; |
| 705 | |
| 706 | init_sync_kiocb(&kiocb, filp); |
| 707 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 708 | |
| 709 | iov_iter_init(&iter, rw, iov, nr_segs, len); |
| 710 | ret = fn(&kiocb, &iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 711 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 712 | *ppos = kiocb.ki_pos; |
| 713 | return ret; |
| 714 | } |
| 715 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 716 | static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 717 | unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) |
| 718 | { |
| 719 | struct kiocb kiocb; |
| 720 | ssize_t ret; |
| 721 | |
| 722 | init_sync_kiocb(&kiocb, filp); |
| 723 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 724 | |
Zach Brown | 41003a7 | 2013-05-07 16:18:25 -0700 | [diff] [blame] | 725 | ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame^] | 726 | BUG_ON(ret == -EIOCBQUEUED); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 727 | *ppos = kiocb.ki_pos; |
| 728 | return ret; |
| 729 | } |
| 730 | |
| 731 | /* Do it by hand, with file-ops */ |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 732 | static ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 733 | unsigned long nr_segs, loff_t *ppos, io_fn_t fn) |
| 734 | { |
| 735 | struct iovec *vector = iov; |
| 736 | ssize_t ret = 0; |
| 737 | |
| 738 | while (nr_segs > 0) { |
| 739 | void __user *base; |
| 740 | size_t len; |
| 741 | ssize_t nr; |
| 742 | |
| 743 | base = vector->iov_base; |
| 744 | len = vector->iov_len; |
| 745 | vector++; |
| 746 | nr_segs--; |
| 747 | |
| 748 | nr = fn(filp, base, len, ppos); |
| 749 | |
| 750 | if (nr < 0) { |
| 751 | if (!ret) |
| 752 | ret = nr; |
| 753 | break; |
| 754 | } |
| 755 | ret += nr; |
| 756 | if (nr != len) |
| 757 | break; |
| 758 | } |
| 759 | |
| 760 | return ret; |
| 761 | } |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | /* A write operation does a read from user space and vice versa */ |
| 764 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
| 765 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 766 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| 767 | unsigned long nr_segs, unsigned long fast_segs, |
| 768 | struct iovec *fast_pointer, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 769 | struct iovec **ret_pointer) |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 770 | { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 771 | unsigned long seg; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 772 | ssize_t ret; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 773 | struct iovec *iov = fast_pointer; |
| 774 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 775 | /* |
| 776 | * SuS says "The readv() function *may* fail if the iovcnt argument |
| 777 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
| 778 | * traditionally returned zero for zero segments, so... |
| 779 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 780 | if (nr_segs == 0) { |
| 781 | ret = 0; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 782 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 783 | } |
| 784 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 785 | /* |
| 786 | * First get the "struct iovec" from user memory and |
| 787 | * verify all the pointers |
| 788 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 789 | if (nr_segs > UIO_MAXIOV) { |
| 790 | ret = -EINVAL; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 791 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 792 | } |
| 793 | if (nr_segs > fast_segs) { |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 794 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 795 | if (iov == NULL) { |
| 796 | ret = -ENOMEM; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 797 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 798 | } |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 799 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 800 | if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { |
| 801 | ret = -EFAULT; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 802 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 803 | } |
| 804 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 805 | /* |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 806 | * According to the Single Unix Specification we should return EINVAL |
| 807 | * if an element length is < 0 when cast to ssize_t or if the |
| 808 | * total length would overflow the ssize_t return value of the |
| 809 | * system call. |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 810 | * |
| 811 | * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the |
| 812 | * overflow case. |
| 813 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 814 | ret = 0; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 815 | for (seg = 0; seg < nr_segs; seg++) { |
| 816 | void __user *buf = iov[seg].iov_base; |
| 817 | ssize_t len = (ssize_t)iov[seg].iov_len; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 818 | |
| 819 | /* see if we we're about to use an invalid len or if |
| 820 | * it's about to overflow ssize_t */ |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 821 | if (len < 0) { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 822 | ret = -EINVAL; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 823 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 824 | } |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 825 | if (type >= 0 |
Christopher Yeoh | fcf6340 | 2011-10-31 17:06:39 -0700 | [diff] [blame] | 826 | && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 827 | ret = -EFAULT; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 828 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 829 | } |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 830 | if (len > MAX_RW_COUNT - ret) { |
| 831 | len = MAX_RW_COUNT - ret; |
| 832 | iov[seg].iov_len = len; |
| 833 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 834 | ret += len; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 835 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 836 | out: |
| 837 | *ret_pointer = iov; |
| 838 | return ret; |
| 839 | } |
| 840 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | static ssize_t do_readv_writev(int type, struct file *file, |
| 842 | const struct iovec __user * uvector, |
| 843 | unsigned long nr_segs, loff_t *pos) |
| 844 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | size_t tot_len; |
| 846 | struct iovec iovstack[UIO_FASTIOV]; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 847 | struct iovec *iov = iovstack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | io_fn_t fn; |
| 850 | iov_fn_t fnv; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 851 | iter_fn_t iter_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 853 | ret = rw_copy_check_uvector(type, uvector, nr_segs, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 854 | ARRAY_SIZE(iovstack), iovstack, &iov); |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 855 | if (ret <= 0) |
| 856 | goto out; |
| 857 | |
| 858 | tot_len = ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | ret = rw_verify_area(type, file, pos, tot_len); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 860 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | goto out; |
| 862 | |
| 863 | fnv = NULL; |
| 864 | if (type == READ) { |
| 865 | fn = file->f_op->read; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 866 | fnv = file->f_op->aio_read; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 867 | iter_fn = file->f_op->read_iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } else { |
| 869 | fn = (io_fn_t)file->f_op->write; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 870 | fnv = file->f_op->aio_write; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 871 | iter_fn = file->f_op->write_iter; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 872 | file_start_write(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | } |
| 874 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 875 | if (iter_fn) |
| 876 | ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len, |
| 877 | pos, iter_fn); |
| 878 | else if (fnv) |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 879 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| 880 | pos, fnv); |
| 881 | else |
| 882 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 884 | if (type != READ) |
| 885 | file_end_write(file); |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | out: |
| 888 | if (iov != iovstack) |
| 889 | kfree(iov); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 890 | if ((ret + (type == READ)) > 0) { |
| 891 | if (type == READ) |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 892 | fsnotify_access(file); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 893 | else |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 894 | fsnotify_modify(file); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 895 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, |
| 900 | unsigned long vlen, loff_t *pos) |
| 901 | { |
| 902 | if (!(file->f_mode & FMODE_READ)) |
| 903 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 904 | if (!(file->f_mode & FMODE_CAN_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | return -EINVAL; |
| 906 | |
| 907 | return do_readv_writev(READ, file, vec, vlen, pos); |
| 908 | } |
| 909 | |
| 910 | EXPORT_SYMBOL(vfs_readv); |
| 911 | |
| 912 | ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, |
| 913 | unsigned long vlen, loff_t *pos) |
| 914 | { |
| 915 | if (!(file->f_mode & FMODE_WRITE)) |
| 916 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 917 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | return -EINVAL; |
| 919 | |
| 920 | return do_readv_writev(WRITE, file, vec, vlen, pos); |
| 921 | } |
| 922 | |
| 923 | EXPORT_SYMBOL(vfs_writev); |
| 924 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 925 | SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, |
| 926 | unsigned long, vlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 928 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 931 | if (f.file) { |
| 932 | loff_t pos = file_pos_read(f.file); |
| 933 | ret = vfs_readv(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 934 | if (ret >= 0) |
| 935 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 936 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | if (ret > 0) |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 940 | add_rchar(current, ret); |
| 941 | inc_syscr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | return ret; |
| 943 | } |
| 944 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 945 | SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, |
| 946 | unsigned long, vlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 948 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 951 | if (f.file) { |
| 952 | loff_t pos = file_pos_read(f.file); |
| 953 | ret = vfs_writev(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 954 | if (ret >= 0) |
| 955 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 956 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | if (ret > 0) |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 960 | add_wchar(current, ret); |
| 961 | inc_syscw(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | return ret; |
| 963 | } |
| 964 | |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 965 | static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 966 | { |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 967 | #define HALF_LONG_BITS (BITS_PER_LONG / 2) |
| 968 | return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; |
| 969 | } |
| 970 | |
| 971 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, |
| 972 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
| 973 | { |
| 974 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 975 | struct fd f; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 976 | ssize_t ret = -EBADF; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 977 | |
| 978 | if (pos < 0) |
| 979 | return -EINVAL; |
| 980 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 981 | f = fdget(fd); |
| 982 | if (f.file) { |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 983 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 984 | if (f.file->f_mode & FMODE_PREAD) |
| 985 | ret = vfs_readv(f.file, vec, vlen, &pos); |
| 986 | fdput(f); |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | if (ret > 0) |
| 990 | add_rchar(current, ret); |
| 991 | inc_syscr(current); |
| 992 | return ret; |
| 993 | } |
| 994 | |
| 995 | SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 996 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 997 | { |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 998 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 999 | struct fd f; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 1000 | ssize_t ret = -EBADF; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 1001 | |
| 1002 | if (pos < 0) |
| 1003 | return -EINVAL; |
| 1004 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1005 | f = fdget(fd); |
| 1006 | if (f.file) { |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 1007 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1008 | if (f.file->f_mode & FMODE_PWRITE) |
| 1009 | ret = vfs_writev(f.file, vec, vlen, &pos); |
| 1010 | fdput(f); |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | if (ret > 0) |
| 1014 | add_wchar(current, ret); |
| 1015 | inc_syscw(current); |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1019 | #ifdef CONFIG_COMPAT |
| 1020 | |
| 1021 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
| 1022 | const struct compat_iovec __user *uvector, |
| 1023 | unsigned long nr_segs, loff_t *pos) |
| 1024 | { |
| 1025 | compat_ssize_t tot_len; |
| 1026 | struct iovec iovstack[UIO_FASTIOV]; |
| 1027 | struct iovec *iov = iovstack; |
| 1028 | ssize_t ret; |
| 1029 | io_fn_t fn; |
| 1030 | iov_fn_t fnv; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1031 | iter_fn_t iter_fn; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1032 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1033 | ret = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
| 1034 | UIO_FASTIOV, iovstack, &iov); |
| 1035 | if (ret <= 0) |
| 1036 | goto out; |
| 1037 | |
| 1038 | tot_len = ret; |
| 1039 | ret = rw_verify_area(type, file, pos, tot_len); |
| 1040 | if (ret < 0) |
| 1041 | goto out; |
| 1042 | |
| 1043 | fnv = NULL; |
| 1044 | if (type == READ) { |
| 1045 | fn = file->f_op->read; |
| 1046 | fnv = file->f_op->aio_read; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1047 | iter_fn = file->f_op->read_iter; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1048 | } else { |
| 1049 | fn = (io_fn_t)file->f_op->write; |
| 1050 | fnv = file->f_op->aio_write; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1051 | iter_fn = file->f_op->write_iter; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1052 | file_start_write(file); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1053 | } |
| 1054 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1055 | if (iter_fn) |
| 1056 | ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len, |
| 1057 | pos, iter_fn); |
| 1058 | else if (fnv) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1059 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| 1060 | pos, fnv); |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1061 | else |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1062 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
| 1063 | |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1064 | if (type != READ) |
| 1065 | file_end_write(file); |
| 1066 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1067 | out: |
| 1068 | if (iov != iovstack) |
| 1069 | kfree(iov); |
| 1070 | if ((ret + (type == READ)) > 0) { |
| 1071 | if (type == READ) |
| 1072 | fsnotify_access(file); |
| 1073 | else |
| 1074 | fsnotify_modify(file); |
| 1075 | } |
| 1076 | return ret; |
| 1077 | } |
| 1078 | |
| 1079 | static size_t compat_readv(struct file *file, |
| 1080 | const struct compat_iovec __user *vec, |
| 1081 | unsigned long vlen, loff_t *pos) |
| 1082 | { |
| 1083 | ssize_t ret = -EBADF; |
| 1084 | |
| 1085 | if (!(file->f_mode & FMODE_READ)) |
| 1086 | goto out; |
| 1087 | |
| 1088 | ret = -EINVAL; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 1089 | if (!(file->f_mode & FMODE_CAN_READ)) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1090 | goto out; |
| 1091 | |
| 1092 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
| 1093 | |
| 1094 | out: |
| 1095 | if (ret > 0) |
| 1096 | add_rchar(current, ret); |
| 1097 | inc_syscr(current); |
| 1098 | return ret; |
| 1099 | } |
| 1100 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1101 | COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1102 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1103 | compat_ulong_t, vlen) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1104 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1105 | struct fd f = fdget_pos(fd); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1106 | ssize_t ret; |
| 1107 | loff_t pos; |
| 1108 | |
| 1109 | if (!f.file) |
| 1110 | return -EBADF; |
| 1111 | pos = f.file->f_pos; |
| 1112 | ret = compat_readv(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 1113 | if (ret >= 0) |
| 1114 | f.file->f_pos = pos; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1115 | fdput_pos(f); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1116 | return ret; |
| 1117 | } |
| 1118 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1119 | static long __compat_sys_preadv64(unsigned long fd, |
| 1120 | const struct compat_iovec __user *vec, |
| 1121 | unsigned long vlen, loff_t pos) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1122 | { |
| 1123 | struct fd f; |
| 1124 | ssize_t ret; |
| 1125 | |
| 1126 | if (pos < 0) |
| 1127 | return -EINVAL; |
| 1128 | f = fdget(fd); |
| 1129 | if (!f.file) |
| 1130 | return -EBADF; |
| 1131 | ret = -ESPIPE; |
| 1132 | if (f.file->f_mode & FMODE_PREAD) |
| 1133 | ret = compat_readv(f.file, vec, vlen, &pos); |
| 1134 | fdput(f); |
| 1135 | return ret; |
| 1136 | } |
| 1137 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1138 | #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 |
| 1139 | COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, |
| 1140 | const struct compat_iovec __user *,vec, |
| 1141 | unsigned long, vlen, loff_t, pos) |
| 1142 | { |
| 1143 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
| 1144 | } |
| 1145 | #endif |
| 1146 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1147 | COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1148 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1149 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1150 | { |
| 1151 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1152 | |
| 1153 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | static size_t compat_writev(struct file *file, |
| 1157 | const struct compat_iovec __user *vec, |
| 1158 | unsigned long vlen, loff_t *pos) |
| 1159 | { |
| 1160 | ssize_t ret = -EBADF; |
| 1161 | |
| 1162 | if (!(file->f_mode & FMODE_WRITE)) |
| 1163 | goto out; |
| 1164 | |
| 1165 | ret = -EINVAL; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 1166 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1167 | goto out; |
| 1168 | |
| 1169 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
| 1170 | |
| 1171 | out: |
| 1172 | if (ret > 0) |
| 1173 | add_wchar(current, ret); |
| 1174 | inc_syscw(current); |
| 1175 | return ret; |
| 1176 | } |
| 1177 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1178 | COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1179 | const struct compat_iovec __user *, vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1180 | compat_ulong_t, vlen) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1181 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1182 | struct fd f = fdget_pos(fd); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1183 | ssize_t ret; |
| 1184 | loff_t pos; |
| 1185 | |
| 1186 | if (!f.file) |
| 1187 | return -EBADF; |
| 1188 | pos = f.file->f_pos; |
| 1189 | ret = compat_writev(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 1190 | if (ret >= 0) |
| 1191 | f.file->f_pos = pos; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1192 | fdput_pos(f); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1193 | return ret; |
| 1194 | } |
| 1195 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1196 | static long __compat_sys_pwritev64(unsigned long fd, |
| 1197 | const struct compat_iovec __user *vec, |
| 1198 | unsigned long vlen, loff_t pos) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1199 | { |
| 1200 | struct fd f; |
| 1201 | ssize_t ret; |
| 1202 | |
| 1203 | if (pos < 0) |
| 1204 | return -EINVAL; |
| 1205 | f = fdget(fd); |
| 1206 | if (!f.file) |
| 1207 | return -EBADF; |
| 1208 | ret = -ESPIPE; |
| 1209 | if (f.file->f_mode & FMODE_PWRITE) |
| 1210 | ret = compat_writev(f.file, vec, vlen, &pos); |
| 1211 | fdput(f); |
| 1212 | return ret; |
| 1213 | } |
| 1214 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1215 | #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 |
| 1216 | COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, |
| 1217 | const struct compat_iovec __user *,vec, |
| 1218 | unsigned long, vlen, loff_t, pos) |
| 1219 | { |
| 1220 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
| 1221 | } |
| 1222 | #endif |
| 1223 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1224 | COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1225 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1226 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1227 | { |
| 1228 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1229 | |
| 1230 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1231 | } |
| 1232 | #endif |
| 1233 | |
Al Viro | 19f4fc3 | 2013-02-24 02:17:03 -0500 | [diff] [blame] | 1234 | static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, |
| 1235 | size_t count, loff_t max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1237 | struct fd in, out; |
| 1238 | struct inode *in_inode, *out_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | loff_t pos; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1240 | loff_t out_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | ssize_t retval; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1242 | int fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
| 1244 | /* |
| 1245 | * Get input file, and verify that it is ok.. |
| 1246 | */ |
| 1247 | retval = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1248 | in = fdget(in_fd); |
| 1249 | if (!in.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | goto out; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1251 | if (!(in.file->f_mode & FMODE_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | goto fput_in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | retval = -ESPIPE; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1254 | if (!ppos) { |
| 1255 | pos = in.file->f_pos; |
| 1256 | } else { |
| 1257 | pos = *ppos; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1258 | if (!(in.file->f_mode & FMODE_PREAD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | goto fput_in; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1260 | } |
| 1261 | retval = rw_verify_area(READ, in.file, &pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1262 | if (retval < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | goto fput_in; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1264 | count = retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | /* |
| 1267 | * Get output file, and verify that it is ok.. |
| 1268 | */ |
| 1269 | retval = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1270 | out = fdget(out_fd); |
| 1271 | if (!out.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | goto fput_in; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1273 | if (!(out.file->f_mode & FMODE_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | goto fput_out; |
| 1275 | retval = -EINVAL; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1276 | in_inode = file_inode(in.file); |
| 1277 | out_inode = file_inode(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1278 | out_pos = out.file->f_pos; |
| 1279 | retval = rw_verify_area(WRITE, out.file, &out_pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1280 | if (retval < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | goto fput_out; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1282 | count = retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | if (!max) |
| 1285 | max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); |
| 1286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | if (unlikely(pos + count > max)) { |
| 1288 | retval = -EOVERFLOW; |
| 1289 | if (pos >= max) |
| 1290 | goto fput_out; |
| 1291 | count = max - pos; |
| 1292 | } |
| 1293 | |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1294 | fl = 0; |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 1295 | #if 0 |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1296 | /* |
| 1297 | * We need to debate whether we can enable this or not. The |
| 1298 | * man page documents EAGAIN return for the output at least, |
| 1299 | * and the application is arguably buggy if it doesn't expect |
| 1300 | * EAGAIN on a non-blocking file descriptor. |
| 1301 | */ |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1302 | if (in.file->f_flags & O_NONBLOCK) |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1303 | fl = SPLICE_F_NONBLOCK; |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 1304 | #endif |
Al Viro | 50cd2c5 | 2013-05-23 20:10:34 -0400 | [diff] [blame] | 1305 | file_start_write(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1306 | retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); |
Al Viro | 50cd2c5 | 2013-05-23 20:10:34 -0400 | [diff] [blame] | 1307 | file_end_write(out.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
| 1309 | if (retval > 0) { |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1310 | add_rchar(current, retval); |
| 1311 | add_wchar(current, retval); |
Scott Wolchok | a68c2f1 | 2012-12-20 15:05:52 -0800 | [diff] [blame] | 1312 | fsnotify_access(in.file); |
| 1313 | fsnotify_modify(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1314 | out.file->f_pos = out_pos; |
| 1315 | if (ppos) |
| 1316 | *ppos = pos; |
| 1317 | else |
| 1318 | in.file->f_pos = pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1321 | inc_syscr(current); |
| 1322 | inc_syscw(current); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1323 | if (pos > max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | retval = -EOVERFLOW; |
| 1325 | |
| 1326 | fput_out: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1327 | fdput(out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | fput_in: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1329 | fdput(in); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | out: |
| 1331 | return retval; |
| 1332 | } |
| 1333 | |
Heiko Carstens | 002c897 | 2009-01-14 14:14:18 +0100 | [diff] [blame] | 1334 | SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | { |
| 1336 | loff_t pos; |
| 1337 | off_t off; |
| 1338 | ssize_t ret; |
| 1339 | |
| 1340 | if (offset) { |
| 1341 | if (unlikely(get_user(off, offset))) |
| 1342 | return -EFAULT; |
| 1343 | pos = off; |
| 1344 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1345 | if (unlikely(put_user(pos, offset))) |
| 1346 | return -EFAULT; |
| 1347 | return ret; |
| 1348 | } |
| 1349 | |
| 1350 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1351 | } |
| 1352 | |
Heiko Carstens | 002c897 | 2009-01-14 14:14:18 +0100 | [diff] [blame] | 1353 | SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | { |
| 1355 | loff_t pos; |
| 1356 | ssize_t ret; |
| 1357 | |
| 1358 | if (offset) { |
| 1359 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1360 | return -EFAULT; |
| 1361 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1362 | if (unlikely(put_user(pos, offset))) |
| 1363 | return -EFAULT; |
| 1364 | return ret; |
| 1365 | } |
| 1366 | |
| 1367 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1368 | } |
Al Viro | 19f4fc3 | 2013-02-24 02:17:03 -0500 | [diff] [blame] | 1369 | |
| 1370 | #ifdef CONFIG_COMPAT |
| 1371 | COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, |
| 1372 | compat_off_t __user *, offset, compat_size_t, count) |
| 1373 | { |
| 1374 | loff_t pos; |
| 1375 | off_t off; |
| 1376 | ssize_t ret; |
| 1377 | |
| 1378 | if (offset) { |
| 1379 | if (unlikely(get_user(off, offset))) |
| 1380 | return -EFAULT; |
| 1381 | pos = off; |
| 1382 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1383 | if (unlikely(put_user(pos, offset))) |
| 1384 | return -EFAULT; |
| 1385 | return ret; |
| 1386 | } |
| 1387 | |
| 1388 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1389 | } |
| 1390 | |
| 1391 | COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, |
| 1392 | compat_loff_t __user *, offset, compat_size_t, count) |
| 1393 | { |
| 1394 | loff_t pos; |
| 1395 | ssize_t ret; |
| 1396 | |
| 1397 | if (offset) { |
| 1398 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1399 | return -EFAULT; |
| 1400 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1401 | if (unlikely(put_user(pos, offset))) |
| 1402 | return -EFAULT; |
| 1403 | return ret; |
| 1404 | } |
| 1405 | |
| 1406 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1407 | } |
| 1408 | #endif |