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> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 12 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/security.h> |
Paul Gortmaker | 630d9c4 | 2011-11-16 23:57:37 -0500 | [diff] [blame] | 14 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/syscalls.h> |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 16 | #include <linux/pagemap.h> |
Jens Axboe | d6b29d7 | 2007-06-04 09:59:47 +0200 | [diff] [blame] | 17 | #include <linux/splice.h> |
Al Viro | 561c673 | 2013-02-24 10:52:26 -0500 | [diff] [blame] | 18 | #include <linux/compat.h> |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 19 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #include <asm/uaccess.h> |
| 22 | #include <asm/unistd.h> |
| 23 | |
Al Viro | c0bd14af | 2013-05-04 15:00:54 -0400 | [diff] [blame] | 24 | typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
| 25 | typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *, |
| 26 | unsigned long, loff_t); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 27 | typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); |
Al Viro | c0bd14af | 2013-05-04 15:00:54 -0400 | [diff] [blame] | 28 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 29 | const struct file_operations generic_ro_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | .llseek = generic_file_llseek, |
Al Viro | aad4f8b | 2014-04-02 14:33:16 -0400 | [diff] [blame] | 31 | .read = new_sync_read, |
| 32 | .read_iter = generic_file_read_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | .mmap = generic_file_readonly_mmap, |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 34 | .splice_read = generic_file_splice_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | }; |
| 36 | |
| 37 | EXPORT_SYMBOL(generic_ro_fops); |
| 38 | |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 39 | static inline int unsigned_offsets(struct file *file) |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 40 | { |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 41 | return file->f_mode & FMODE_UNSIGNED_OFFSET; |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 42 | } |
| 43 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 44 | /** |
| 45 | * vfs_setpos - update the file offset for lseek |
| 46 | * @file: file structure in question |
| 47 | * @offset: file offset to seek to |
| 48 | * @maxsize: maximum file size |
| 49 | * |
| 50 | * This is a low-level filesystem helper for updating the file offset to |
| 51 | * the value specified by @offset if the given offset is valid and it is |
| 52 | * not equal to the current file offset. |
| 53 | * |
| 54 | * Return the specified offset on success and -EINVAL on invalid offset. |
| 55 | */ |
| 56 | 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] | 57 | { |
| 58 | if (offset < 0 && !unsigned_offsets(file)) |
| 59 | return -EINVAL; |
| 60 | if (offset > maxsize) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | if (offset != file->f_pos) { |
| 64 | file->f_pos = offset; |
| 65 | file->f_version = 0; |
| 66 | } |
| 67 | return offset; |
| 68 | } |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 69 | EXPORT_SYMBOL(vfs_setpos); |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 70 | |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 71 | /** |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 72 | * generic_file_llseek_size - generic llseek implementation for regular files |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 73 | * @file: file structure to seek on |
| 74 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 75 | * @whence: type of seek |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 76 | * @size: max size of this file in file system |
| 77 | * @eof: offset used for SEEK_END position |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 78 | * |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 79 | * 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] | 80 | * 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] | 81 | * |
| 82 | * Synchronization: |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 83 | * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 84 | * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. |
| 85 | * read/writes behave like SEEK_SET against seeks. |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 86 | */ |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 87 | loff_t |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 88 | generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 89 | loff_t maxsize, loff_t eof) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 91 | switch (whence) { |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 92 | case SEEK_END: |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 93 | offset += eof; |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 94 | break; |
| 95 | case SEEK_CUR: |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 96 | /* |
| 97 | * Here we special-case the lseek(fd, 0, SEEK_CUR) |
| 98 | * position-querying operation. Avoid rewriting the "same" |
| 99 | * f_pos value back to the file because a concurrent read(), |
| 100 | * write() or lseek() might have altered it |
| 101 | */ |
| 102 | if (offset == 0) |
| 103 | return file->f_pos; |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 104 | /* |
| 105 | * f_lock protects against read/modify/write race with other |
| 106 | * SEEK_CURs. Note that parallel writes and reads behave |
| 107 | * like SEEK_SET. |
| 108 | */ |
| 109 | spin_lock(&file->f_lock); |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 110 | offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 111 | spin_unlock(&file->f_lock); |
| 112 | return offset; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 113 | case SEEK_DATA: |
| 114 | /* |
| 115 | * In the generic case the entire file is data, so as long as |
| 116 | * offset isn't at the end of the file then the offset is data. |
| 117 | */ |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 118 | if (offset >= eof) |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 119 | return -ENXIO; |
| 120 | break; |
| 121 | case SEEK_HOLE: |
| 122 | /* |
| 123 | * There is a virtual hole at the end of the file, so as long as |
| 124 | * offset isn't i_size or larger, return i_size. |
| 125 | */ |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 126 | if (offset >= eof) |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 127 | return -ENXIO; |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 128 | offset = eof; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 129 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
Christoph Hellwig | 3a8cff4 | 2008-08-11 15:37:17 +0200 | [diff] [blame] | 131 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 132 | return vfs_setpos(file, offset, maxsize); |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 133 | } |
| 134 | EXPORT_SYMBOL(generic_file_llseek_size); |
| 135 | |
| 136 | /** |
| 137 | * generic_file_llseek - generic llseek implementation for regular files |
| 138 | * @file: file structure to seek on |
| 139 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 140 | * @whence: type of seek |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 141 | * |
| 142 | * This is a generic implemenation of ->llseek useable for all normal local |
| 143 | * filesystems. It just updates the file offset to the value specified by |
Ming Lei | 546ae2d | 2013-04-29 15:06:07 -0700 | [diff] [blame] | 144 | * @offset and @whence. |
Andi Kleen | 5760495 | 2011-09-15 16:06:50 -0700 | [diff] [blame] | 145 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 146 | 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] | 147 | { |
| 148 | struct inode *inode = file->f_mapping->host; |
| 149 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 150 | return generic_file_llseek_size(file, offset, whence, |
Eric Sandeen | e8b96eb | 2012-04-30 13:11:29 -0500 | [diff] [blame] | 151 | inode->i_sb->s_maxbytes, |
| 152 | i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 154 | EXPORT_SYMBOL(generic_file_llseek); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 156 | /** |
Al Viro | 1bf9d14 | 2013-06-16 20:27:42 +0400 | [diff] [blame] | 157 | * fixed_size_llseek - llseek implementation for fixed-sized devices |
| 158 | * @file: file structure to seek on |
| 159 | * @offset: file offset to seek to |
| 160 | * @whence: type of seek |
| 161 | * @size: size of the file |
| 162 | * |
| 163 | */ |
| 164 | loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) |
| 165 | { |
| 166 | switch (whence) { |
| 167 | case SEEK_SET: case SEEK_CUR: case SEEK_END: |
| 168 | return generic_file_llseek_size(file, offset, whence, |
| 169 | size, size); |
| 170 | default: |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | } |
| 174 | EXPORT_SYMBOL(fixed_size_llseek); |
| 175 | |
| 176 | /** |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 177 | * noop_llseek - No Operation Performed llseek implementation |
| 178 | * @file: file structure to seek on |
| 179 | * @offset: file offset to seek to |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 180 | * @whence: type of seek |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 181 | * |
| 182 | * This is an implementation of ->llseek useable for the rare special case when |
| 183 | * userspace expects the seek to succeed but the (device) file is actually not |
| 184 | * able to perform the seek. In this case you use noop_llseek() instead of |
| 185 | * falling back to the default implementation of ->llseek. |
| 186 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 187 | loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 188 | { |
| 189 | return file->f_pos; |
| 190 | } |
| 191 | EXPORT_SYMBOL(noop_llseek); |
| 192 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 193 | loff_t no_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
| 195 | return -ESPIPE; |
| 196 | } |
| 197 | EXPORT_SYMBOL(no_llseek); |
| 198 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 199 | loff_t default_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 201 | struct inode *inode = file_inode(file); |
David Sterba | 16abef0 | 2008-04-22 15:09:22 +0200 | [diff] [blame] | 202 | loff_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 204 | mutex_lock(&inode->i_mutex); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 205 | switch (whence) { |
Chris Snook | 7b8e892 | 2007-05-08 00:24:13 -0700 | [diff] [blame] | 206 | case SEEK_END: |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 207 | offset += i_size_read(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | break; |
Chris Snook | 7b8e892 | 2007-05-08 00:24:13 -0700 | [diff] [blame] | 209 | case SEEK_CUR: |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 210 | if (offset == 0) { |
| 211 | retval = file->f_pos; |
| 212 | goto out; |
| 213 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | offset += file->f_pos; |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 215 | break; |
| 216 | case SEEK_DATA: |
| 217 | /* |
| 218 | * In the generic case the entire file is data, so as |
| 219 | * long as offset isn't at the end of the file then the |
| 220 | * offset is data. |
| 221 | */ |
Dan Carpenter | bacb2d8 | 2011-07-26 17:25:20 +0300 | [diff] [blame] | 222 | if (offset >= inode->i_size) { |
| 223 | retval = -ENXIO; |
| 224 | goto out; |
| 225 | } |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 226 | break; |
| 227 | case SEEK_HOLE: |
| 228 | /* |
| 229 | * There is a virtual hole at the end of the file, so |
| 230 | * as long as offset isn't i_size or larger, return |
| 231 | * i_size. |
| 232 | */ |
Dan Carpenter | bacb2d8 | 2011-07-26 17:25:20 +0300 | [diff] [blame] | 233 | if (offset >= inode->i_size) { |
| 234 | retval = -ENXIO; |
| 235 | goto out; |
| 236 | } |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 237 | offset = inode->i_size; |
| 238 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | retval = -EINVAL; |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 241 | if (offset >= 0 || unsigned_offsets(file)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | if (offset != file->f_pos) { |
| 243 | file->f_pos = offset; |
| 244 | file->f_version = 0; |
| 245 | } |
| 246 | retval = offset; |
| 247 | } |
Alain Knaff | 5b6f1eb | 2008-11-10 17:08:08 -0800 | [diff] [blame] | 248 | out: |
Josef Bacik | 982d816 | 2011-07-18 13:21:35 -0400 | [diff] [blame] | 249 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | return retval; |
| 251 | } |
| 252 | EXPORT_SYMBOL(default_llseek); |
| 253 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 254 | loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | { |
| 256 | loff_t (*fn)(struct file *, loff_t, int); |
| 257 | |
| 258 | fn = no_llseek; |
| 259 | if (file->f_mode & FMODE_LSEEK) { |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 260 | if (file->f_op->llseek) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | fn = file->f_op->llseek; |
| 262 | } |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 263 | return fn(file, offset, whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | EXPORT_SYMBOL(vfs_llseek); |
| 266 | |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 267 | static inline struct fd fdget_pos(int fd) |
| 268 | { |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 269 | return __to_fd(__fdget_pos(fd)); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | static inline void fdput_pos(struct fd f) |
| 273 | { |
| 274 | if (f.flags & FDPUT_POS_UNLOCK) |
| 275 | mutex_unlock(&f.file->f_pos_lock); |
| 276 | fdput(f); |
| 277 | } |
| 278 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 279 | SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | off_t retval; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 282 | struct fd f = fdget_pos(fd); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 283 | if (!f.file) |
| 284 | return -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | retval = -EINVAL; |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 287 | if (whence <= SEEK_MAX) { |
| 288 | loff_t res = vfs_llseek(f.file, offset, whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | retval = res; |
| 290 | if (res != (loff_t)retval) |
| 291 | retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ |
| 292 | } |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 293 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | return retval; |
| 295 | } |
| 296 | |
Al Viro | 561c673 | 2013-02-24 10:52:26 -0500 | [diff] [blame] | 297 | #ifdef CONFIG_COMPAT |
| 298 | COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) |
| 299 | { |
| 300 | return sys_lseek(fd, offset, whence); |
| 301 | } |
| 302 | #endif |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | #ifdef __ARCH_WANT_SYS_LLSEEK |
Heiko Carstens | 003d7ab | 2009-01-14 14:14:21 +0100 | [diff] [blame] | 305 | SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, |
| 306 | unsigned long, offset_low, loff_t __user *, result, |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 307 | unsigned int, whence) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | int retval; |
Eric Biggers | d7a15f8 | 2014-03-16 14:24:08 -0500 | [diff] [blame] | 310 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | loff_t offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 313 | if (!f.file) |
| 314 | return -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | retval = -EINVAL; |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 317 | if (whence > SEEK_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | goto out_putf; |
| 319 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 320 | offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 321 | whence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | retval = (int)offset; |
| 324 | if (offset >= 0) { |
| 325 | retval = -EFAULT; |
| 326 | if (!copy_to_user(result, &offset, sizeof(offset))) |
| 327 | retval = 0; |
| 328 | } |
| 329 | out_putf: |
Eric Biggers | d7a15f8 | 2014-03-16 14:24:08 -0500 | [diff] [blame] | 330 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | return retval; |
| 332 | } |
| 333 | #endif |
| 334 | |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 335 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos) |
| 336 | { |
| 337 | struct kiocb kiocb; |
| 338 | ssize_t ret; |
| 339 | |
| 340 | if (!file->f_op->read_iter) |
| 341 | return -EINVAL; |
| 342 | |
| 343 | init_sync_kiocb(&kiocb, file); |
| 344 | kiocb.ki_pos = *ppos; |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 345 | |
| 346 | iter->type |= READ; |
| 347 | ret = file->f_op->read_iter(&kiocb, iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 348 | BUG_ON(ret == -EIOCBQUEUED); |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 349 | if (ret > 0) |
| 350 | *ppos = kiocb.ki_pos; |
| 351 | return ret; |
| 352 | } |
| 353 | EXPORT_SYMBOL(vfs_iter_read); |
| 354 | |
| 355 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos) |
| 356 | { |
| 357 | struct kiocb kiocb; |
| 358 | ssize_t ret; |
| 359 | |
| 360 | if (!file->f_op->write_iter) |
| 361 | return -EINVAL; |
| 362 | |
| 363 | init_sync_kiocb(&kiocb, file); |
| 364 | kiocb.ki_pos = *ppos; |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 365 | |
| 366 | iter->type |= WRITE; |
| 367 | ret = file->f_op->write_iter(&kiocb, iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 368 | BUG_ON(ret == -EIOCBQUEUED); |
Christoph Hellwig | dbe4e19 | 2015-01-25 21:11:59 +0100 | [diff] [blame] | 369 | if (ret > 0) |
| 370 | *ppos = kiocb.ki_pos; |
| 371 | return ret; |
| 372 | } |
| 373 | EXPORT_SYMBOL(vfs_iter_write); |
| 374 | |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 375 | /* |
| 376 | * rw_verify_area doesn't like huge counts. We limit |
| 377 | * them to something that fits in "int" so that others |
| 378 | * won't have to do range checks all the time. |
| 379 | */ |
Al Viro | 68d70d0 | 2013-06-19 15:26:04 +0400 | [diff] [blame] | 380 | 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] | 381 | { |
| 382 | struct inode *inode; |
| 383 | loff_t pos; |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 384 | int retval = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 386 | inode = file_inode(file); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 387 | if (unlikely((ssize_t) count < 0)) |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 388 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | pos = *ppos; |
Al Viro | cccb5a1 | 2010-12-17 07:44:05 -0500 | [diff] [blame] | 390 | if (unlikely(pos < 0)) { |
| 391 | if (!unsigned_offsets(file)) |
| 392 | return retval; |
| 393 | if (count >= -pos) /* both values are in 0..LLONG_MAX */ |
| 394 | return -EOVERFLOW; |
| 395 | } else if (unlikely((loff_t) (pos + count) < 0)) { |
| 396 | if (!unsigned_offsets(file)) |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 397 | return retval; |
| 398 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 400 | if (unlikely(inode->i_flctx && mandatory_lock(inode))) { |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 401 | retval = locks_mandatory_area( |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 402 | read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, |
| 403 | inode, file, pos, count); |
| 404 | if (retval < 0) |
| 405 | return retval; |
| 406 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 407 | retval = security_file_permission(file, |
| 408 | read_write == READ ? MAY_READ : MAY_WRITE); |
| 409 | if (retval) |
| 410 | return retval; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 411 | return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
| 415 | { |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 416 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | struct kiocb kiocb; |
| 418 | ssize_t ret; |
| 419 | |
| 420 | init_sync_kiocb(&kiocb, filp); |
| 421 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 422 | |
Zach Brown | 41003a7 | 2013-05-07 16:18:25 -0700 | [diff] [blame] | 423 | ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 424 | BUG_ON(ret == -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | *ppos = kiocb.ki_pos; |
| 426 | return ret; |
| 427 | } |
| 428 | |
| 429 | EXPORT_SYMBOL(do_sync_read); |
| 430 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 431 | ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
| 432 | { |
| 433 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
| 434 | struct kiocb kiocb; |
| 435 | struct iov_iter iter; |
| 436 | ssize_t ret; |
| 437 | |
| 438 | init_sync_kiocb(&kiocb, filp); |
| 439 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 440 | iov_iter_init(&iter, READ, &iov, 1, len); |
| 441 | |
| 442 | ret = filp->f_op->read_iter(&kiocb, &iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 443 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 444 | *ppos = kiocb.ki_pos; |
| 445 | return ret; |
| 446 | } |
| 447 | |
| 448 | EXPORT_SYMBOL(new_sync_read); |
| 449 | |
Dmitry Kasatkin | 6fb5032 | 2014-11-05 17:01:17 +0200 | [diff] [blame] | 450 | ssize_t __vfs_read(struct file *file, char __user *buf, size_t count, |
| 451 | loff_t *pos) |
| 452 | { |
| 453 | ssize_t ret; |
| 454 | |
| 455 | if (file->f_op->read) |
| 456 | ret = file->f_op->read(file, buf, count, pos); |
| 457 | else if (file->f_op->aio_read) |
| 458 | ret = do_sync_read(file, buf, count, pos); |
| 459 | else if (file->f_op->read_iter) |
| 460 | ret = new_sync_read(file, buf, count, pos); |
| 461 | else |
| 462 | ret = -EINVAL; |
| 463 | |
| 464 | return ret; |
| 465 | } |
| 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
| 468 | { |
| 469 | ssize_t ret; |
| 470 | |
| 471 | if (!(file->f_mode & FMODE_READ)) |
| 472 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 473 | if (!(file->f_mode & FMODE_CAN_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return -EINVAL; |
| 475 | if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) |
| 476 | return -EFAULT; |
| 477 | |
| 478 | ret = rw_verify_area(READ, file, pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 479 | if (ret >= 0) { |
| 480 | count = ret; |
Dmitry Kasatkin | 6fb5032 | 2014-11-05 17:01:17 +0200 | [diff] [blame] | 481 | ret = __vfs_read(file, buf, count, pos); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 482 | if (ret > 0) { |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 483 | fsnotify_access(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 484 | add_rchar(current, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 486 | inc_syscr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | return ret; |
| 490 | } |
| 491 | |
| 492 | EXPORT_SYMBOL(vfs_read); |
| 493 | |
| 494 | ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
| 495 | { |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 496 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | struct kiocb kiocb; |
| 498 | ssize_t ret; |
| 499 | |
| 500 | init_sync_kiocb(&kiocb, filp); |
| 501 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 502 | |
Zach Brown | 41003a7 | 2013-05-07 16:18:25 -0700 | [diff] [blame] | 503 | ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 504 | BUG_ON(ret == -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | *ppos = kiocb.ki_pos; |
| 506 | return ret; |
| 507 | } |
| 508 | |
| 509 | EXPORT_SYMBOL(do_sync_write); |
| 510 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 511 | ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
| 512 | { |
| 513 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
| 514 | struct kiocb kiocb; |
| 515 | struct iov_iter iter; |
| 516 | ssize_t ret; |
| 517 | |
| 518 | init_sync_kiocb(&kiocb, filp); |
| 519 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 520 | iov_iter_init(&iter, WRITE, &iov, 1, len); |
| 521 | |
| 522 | ret = filp->f_op->write_iter(&kiocb, &iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 523 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 524 | *ppos = kiocb.ki_pos; |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | EXPORT_SYMBOL(new_sync_write); |
| 529 | |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 530 | ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) |
| 531 | { |
| 532 | mm_segment_t old_fs; |
| 533 | const char __user *p; |
| 534 | ssize_t ret; |
| 535 | |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 536 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Al Viro | 3e84f48 | 2013-03-27 15:20:30 +0000 | [diff] [blame] | 537 | return -EINVAL; |
| 538 | |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 539 | old_fs = get_fs(); |
| 540 | set_fs(get_ds()); |
| 541 | p = (__force const char __user *)buf; |
| 542 | if (count > MAX_RW_COUNT) |
| 543 | count = MAX_RW_COUNT; |
| 544 | if (file->f_op->write) |
| 545 | ret = file->f_op->write(file, p, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 546 | else if (file->f_op->aio_write) |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 547 | ret = do_sync_write(file, p, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 548 | else |
| 549 | ret = new_sync_write(file, p, count, pos); |
Al Viro | 06ae43f | 2013-03-20 13:19:30 -0400 | [diff] [blame] | 550 | set_fs(old_fs); |
| 551 | if (ret > 0) { |
| 552 | fsnotify_modify(file); |
| 553 | add_wchar(current, ret); |
| 554 | } |
| 555 | inc_syscw(current); |
| 556 | return ret; |
| 557 | } |
| 558 | |
Al Viro | 2ec3a12 | 2014-08-19 11:48:09 -0400 | [diff] [blame] | 559 | EXPORT_SYMBOL(__kernel_write); |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
| 562 | { |
| 563 | ssize_t ret; |
| 564 | |
| 565 | if (!(file->f_mode & FMODE_WRITE)) |
| 566 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 567 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return -EINVAL; |
| 569 | if (unlikely(!access_ok(VERIFY_READ, buf, count))) |
| 570 | return -EFAULT; |
| 571 | |
| 572 | ret = rw_verify_area(WRITE, file, pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 573 | if (ret >= 0) { |
| 574 | count = ret; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 575 | file_start_write(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 576 | if (file->f_op->write) |
| 577 | ret = file->f_op->write(file, buf, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 578 | else if (file->f_op->aio_write) |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 579 | ret = do_sync_write(file, buf, count, pos); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 580 | else |
| 581 | ret = new_sync_write(file, buf, count, pos); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 582 | if (ret > 0) { |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 583 | fsnotify_modify(file); |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 584 | add_wchar(current, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
James Morris | c43e259 | 2008-01-12 22:05:48 +1100 | [diff] [blame] | 586 | inc_syscw(current); |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 587 | file_end_write(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | return ret; |
| 591 | } |
| 592 | |
| 593 | EXPORT_SYMBOL(vfs_write); |
| 594 | |
| 595 | static inline loff_t file_pos_read(struct file *file) |
| 596 | { |
| 597 | return file->f_pos; |
| 598 | } |
| 599 | |
| 600 | static inline void file_pos_write(struct file *file, loff_t pos) |
| 601 | { |
| 602 | file->f_pos = pos; |
| 603 | } |
| 604 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 605 | SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 607 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 610 | if (f.file) { |
| 611 | loff_t pos = file_pos_read(f.file); |
| 612 | ret = vfs_read(f.file, buf, count, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 613 | if (ret >= 0) |
| 614 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 615 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return ret; |
| 618 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 620 | SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, |
| 621 | size_t, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 623 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 626 | if (f.file) { |
| 627 | loff_t pos = file_pos_read(f.file); |
| 628 | ret = vfs_write(f.file, buf, count, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 629 | if (ret >= 0) |
| 630 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 631 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | return ret; |
| 635 | } |
| 636 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 637 | SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, |
| 638 | size_t, count, loff_t, pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 640 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | if (pos < 0) |
| 644 | return -EINVAL; |
| 645 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 646 | f = fdget(fd); |
| 647 | if (f.file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 649 | if (f.file->f_mode & FMODE_PREAD) |
| 650 | ret = vfs_read(f.file, buf, count, &pos); |
| 651 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | return ret; |
| 655 | } |
| 656 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 657 | SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, |
| 658 | size_t, count, loff_t, pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 660 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | if (pos < 0) |
| 664 | return -EINVAL; |
| 665 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 666 | f = fdget(fd); |
| 667 | if (f.file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 669 | if (f.file->f_mode & FMODE_PWRITE) |
| 670 | ret = vfs_write(f.file, buf, count, &pos); |
| 671 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
| 673 | |
| 674 | return ret; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Reduce an iovec's length in-place. Return the resulting number of segments |
| 679 | */ |
| 680 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) |
| 681 | { |
| 682 | unsigned long seg = 0; |
| 683 | size_t len = 0; |
| 684 | |
| 685 | while (seg < nr_segs) { |
| 686 | seg++; |
| 687 | if (len + iov->iov_len >= to) { |
| 688 | iov->iov_len = to - len; |
| 689 | break; |
| 690 | } |
| 691 | len += iov->iov_len; |
| 692 | iov++; |
| 693 | } |
| 694 | return seg; |
| 695 | } |
Eric Sandeen | 1929552 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 696 | EXPORT_SYMBOL(iov_shorten); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 698 | static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, |
| 699 | loff_t *ppos, iter_fn_t fn) |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 700 | { |
| 701 | struct kiocb kiocb; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 702 | ssize_t ret; |
| 703 | |
| 704 | init_sync_kiocb(&kiocb, filp); |
| 705 | kiocb.ki_pos = *ppos; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 706 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 707 | ret = fn(&kiocb, iter); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 708 | BUG_ON(ret == -EIOCBQUEUED); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 709 | *ppos = kiocb.ki_pos; |
| 710 | return ret; |
| 711 | } |
| 712 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 713 | static ssize_t do_sync_readv_writev(struct file *filp, struct iov_iter *iter, |
| 714 | loff_t *ppos, iov_fn_t fn) |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 715 | { |
| 716 | struct kiocb kiocb; |
| 717 | ssize_t ret; |
| 718 | |
| 719 | init_sync_kiocb(&kiocb, filp); |
| 720 | kiocb.ki_pos = *ppos; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 721 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 722 | ret = fn(&kiocb, iter->iov, iter->nr_segs, kiocb.ki_pos); |
Christoph Hellwig | 599bd19 | 2015-02-11 19:59:44 +0100 | [diff] [blame] | 723 | BUG_ON(ret == -EIOCBQUEUED); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 724 | *ppos = kiocb.ki_pos; |
| 725 | return ret; |
| 726 | } |
| 727 | |
| 728 | /* Do it by hand, with file-ops */ |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 729 | static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, |
| 730 | loff_t *ppos, io_fn_t fn) |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 731 | { |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 732 | ssize_t ret = 0; |
| 733 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 734 | while (iov_iter_count(iter)) { |
| 735 | struct iovec iovec = iov_iter_iovec(iter); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 736 | ssize_t nr; |
| 737 | |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 738 | nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 739 | |
| 740 | if (nr < 0) { |
| 741 | if (!ret) |
| 742 | ret = nr; |
| 743 | break; |
| 744 | } |
| 745 | ret += nr; |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 746 | if (nr != iovec.iov_len) |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 747 | break; |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 748 | iov_iter_advance(iter, nr); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | return ret; |
| 752 | } |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | /* A write operation does a read from user space and vice versa */ |
| 755 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
| 756 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 757 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| 758 | unsigned long nr_segs, unsigned long fast_segs, |
| 759 | struct iovec *fast_pointer, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 760 | struct iovec **ret_pointer) |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 761 | { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 762 | unsigned long seg; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 763 | ssize_t ret; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 764 | struct iovec *iov = fast_pointer; |
| 765 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 766 | /* |
| 767 | * SuS says "The readv() function *may* fail if the iovcnt argument |
| 768 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
| 769 | * traditionally returned zero for zero segments, so... |
| 770 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 771 | if (nr_segs == 0) { |
| 772 | ret = 0; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 773 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 776 | /* |
| 777 | * First get the "struct iovec" from user memory and |
| 778 | * verify all the pointers |
| 779 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 780 | if (nr_segs > UIO_MAXIOV) { |
| 781 | ret = -EINVAL; |
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 | if (nr_segs > fast_segs) { |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 785 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 786 | if (iov == NULL) { |
| 787 | ret = -ENOMEM; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 788 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 789 | } |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 790 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 791 | if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { |
| 792 | ret = -EFAULT; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 793 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 796 | /* |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 797 | * According to the Single Unix Specification we should return EINVAL |
| 798 | * if an element length is < 0 when cast to ssize_t or if the |
| 799 | * total length would overflow the ssize_t return value of the |
| 800 | * system call. |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 801 | * |
| 802 | * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the |
| 803 | * overflow case. |
| 804 | */ |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 805 | ret = 0; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 806 | for (seg = 0; seg < nr_segs; seg++) { |
| 807 | void __user *buf = iov[seg].iov_base; |
| 808 | ssize_t len = (ssize_t)iov[seg].iov_len; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 809 | |
| 810 | /* see if we we're about to use an invalid len or if |
| 811 | * it's about to overflow ssize_t */ |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 812 | if (len < 0) { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 813 | ret = -EINVAL; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 814 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 815 | } |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 816 | if (type >= 0 |
Christopher Yeoh | fcf6340 | 2011-10-31 17:06:39 -0700 | [diff] [blame] | 817 | && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 818 | ret = -EFAULT; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 819 | goto out; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 820 | } |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 821 | if (len > MAX_RW_COUNT - ret) { |
| 822 | len = MAX_RW_COUNT - ret; |
| 823 | iov[seg].iov_len = len; |
| 824 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 825 | ret += len; |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 826 | } |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 827 | out: |
| 828 | *ret_pointer = iov; |
| 829 | return ret; |
| 830 | } |
| 831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | static ssize_t do_readv_writev(int type, struct file *file, |
| 833 | const struct iovec __user * uvector, |
| 834 | unsigned long nr_segs, loff_t *pos) |
| 835 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | size_t tot_len; |
| 837 | struct iovec iovstack[UIO_FASTIOV]; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 838 | struct iovec *iov = iovstack; |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 839 | struct iov_iter iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | io_fn_t fn; |
| 842 | iov_fn_t fnv; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 843 | iter_fn_t iter_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 845 | ret = import_iovec(type, uvector, nr_segs, |
| 846 | ARRAY_SIZE(iovstack), &iov, &iter); |
| 847 | if (ret < 0) |
| 848 | return ret; |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 849 | |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 850 | tot_len = iov_iter_count(&iter); |
| 851 | if (!tot_len) |
| 852 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | ret = rw_verify_area(type, file, pos, tot_len); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 854 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | goto out; |
| 856 | |
| 857 | fnv = NULL; |
| 858 | if (type == READ) { |
| 859 | fn = file->f_op->read; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 860 | fnv = file->f_op->aio_read; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 861 | iter_fn = file->f_op->read_iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } else { |
| 863 | fn = (io_fn_t)file->f_op->write; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 864 | fnv = file->f_op->aio_write; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 865 | iter_fn = file->f_op->write_iter; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 866 | file_start_write(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 869 | if (iter_fn) |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 870 | ret = do_iter_readv_writev(file, &iter, pos, iter_fn); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 871 | else if (fnv) |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 872 | ret = do_sync_readv_writev(file, &iter, pos, fnv); |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 873 | else |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 874 | ret = do_loop_readv_writev(file, &iter, pos, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 876 | if (type != READ) |
| 877 | file_end_write(file); |
| 878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | out: |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 880 | kfree(iov); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 881 | if ((ret + (type == READ)) > 0) { |
| 882 | if (type == READ) |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 883 | fsnotify_access(file); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 884 | else |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 885 | fsnotify_modify(file); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 886 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
| 889 | |
| 890 | ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, |
| 891 | unsigned long vlen, loff_t *pos) |
| 892 | { |
| 893 | if (!(file->f_mode & FMODE_READ)) |
| 894 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 895 | if (!(file->f_mode & FMODE_CAN_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return -EINVAL; |
| 897 | |
| 898 | return do_readv_writev(READ, file, vec, vlen, pos); |
| 899 | } |
| 900 | |
| 901 | EXPORT_SYMBOL(vfs_readv); |
| 902 | |
| 903 | ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, |
| 904 | unsigned long vlen, loff_t *pos) |
| 905 | { |
| 906 | if (!(file->f_mode & FMODE_WRITE)) |
| 907 | return -EBADF; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 908 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | return -EINVAL; |
| 910 | |
| 911 | return do_readv_writev(WRITE, file, vec, vlen, pos); |
| 912 | } |
| 913 | |
| 914 | EXPORT_SYMBOL(vfs_writev); |
| 915 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 916 | SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, |
| 917 | unsigned long, vlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 919 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 922 | if (f.file) { |
| 923 | loff_t pos = file_pos_read(f.file); |
| 924 | ret = vfs_readv(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 925 | if (ret >= 0) |
| 926 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 927 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | if (ret > 0) |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 931 | add_rchar(current, ret); |
| 932 | inc_syscr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | return ret; |
| 934 | } |
| 935 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 936 | SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, |
| 937 | unsigned long, vlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 939 | struct fd f = fdget_pos(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | ssize_t ret = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 942 | if (f.file) { |
| 943 | loff_t pos = file_pos_read(f.file); |
| 944 | ret = vfs_writev(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 945 | if (ret >= 0) |
| 946 | file_pos_write(f.file, pos); |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 947 | fdput_pos(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | if (ret > 0) |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 951 | add_wchar(current, ret); |
| 952 | inc_syscw(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | return ret; |
| 954 | } |
| 955 | |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 956 | 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] | 957 | { |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 958 | #define HALF_LONG_BITS (BITS_PER_LONG / 2) |
| 959 | return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; |
| 960 | } |
| 961 | |
| 962 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, |
| 963 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
| 964 | { |
| 965 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 966 | struct fd f; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 967 | ssize_t ret = -EBADF; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 968 | |
| 969 | if (pos < 0) |
| 970 | return -EINVAL; |
| 971 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 972 | f = fdget(fd); |
| 973 | if (f.file) { |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 974 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 975 | if (f.file->f_mode & FMODE_PREAD) |
| 976 | ret = vfs_readv(f.file, vec, vlen, &pos); |
| 977 | fdput(f); |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | if (ret > 0) |
| 981 | add_rchar(current, ret); |
| 982 | inc_syscr(current); |
| 983 | return ret; |
| 984 | } |
| 985 | |
| 986 | SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 987 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 988 | { |
Linus Torvalds | 601cc11 | 2009-04-03 08:03:22 -0700 | [diff] [blame] | 989 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 990 | struct fd f; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 991 | ssize_t ret = -EBADF; |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 992 | |
| 993 | if (pos < 0) |
| 994 | return -EINVAL; |
| 995 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 996 | f = fdget(fd); |
| 997 | if (f.file) { |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 998 | ret = -ESPIPE; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 999 | if (f.file->f_mode & FMODE_PWRITE) |
| 1000 | ret = vfs_writev(f.file, vec, vlen, &pos); |
| 1001 | fdput(f); |
Gerd Hoffmann | f3554f4 | 2009-04-02 16:59:23 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
| 1004 | if (ret > 0) |
| 1005 | add_wchar(current, ret); |
| 1006 | inc_syscw(current); |
| 1007 | return ret; |
| 1008 | } |
| 1009 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1010 | #ifdef CONFIG_COMPAT |
| 1011 | |
| 1012 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
| 1013 | const struct compat_iovec __user *uvector, |
| 1014 | unsigned long nr_segs, loff_t *pos) |
| 1015 | { |
| 1016 | compat_ssize_t tot_len; |
| 1017 | struct iovec iovstack[UIO_FASTIOV]; |
| 1018 | struct iovec *iov = iovstack; |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 1019 | struct iov_iter iter; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1020 | ssize_t ret; |
| 1021 | io_fn_t fn; |
| 1022 | iov_fn_t fnv; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1023 | iter_fn_t iter_fn; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1024 | |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 1025 | ret = compat_import_iovec(type, uvector, nr_segs, |
| 1026 | UIO_FASTIOV, &iov, &iter); |
| 1027 | if (ret < 0) |
| 1028 | return ret; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1029 | |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 1030 | tot_len = iov_iter_count(&iter); |
| 1031 | if (!tot_len) |
| 1032 | goto out; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1033 | ret = rw_verify_area(type, file, pos, tot_len); |
| 1034 | if (ret < 0) |
| 1035 | goto out; |
| 1036 | |
| 1037 | fnv = NULL; |
| 1038 | if (type == READ) { |
| 1039 | fn = file->f_op->read; |
| 1040 | fnv = file->f_op->aio_read; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1041 | iter_fn = file->f_op->read_iter; |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1042 | } else { |
| 1043 | fn = (io_fn_t)file->f_op->write; |
| 1044 | fnv = file->f_op->aio_write; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1045 | iter_fn = file->f_op->write_iter; |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1046 | file_start_write(file); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1047 | } |
| 1048 | |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1049 | if (iter_fn) |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 1050 | ret = do_iter_readv_writev(file, &iter, pos, iter_fn); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 1051 | else if (fnv) |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 1052 | ret = do_sync_readv_writev(file, &iter, pos, fnv); |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1053 | else |
Al Viro | ac15ac0 | 2015-03-20 20:10:21 -0400 | [diff] [blame] | 1054 | ret = do_loop_readv_writev(file, &iter, pos, fn); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1055 | |
Al Viro | 03d95eb | 2013-03-20 13:04:20 -0400 | [diff] [blame] | 1056 | if (type != READ) |
| 1057 | file_end_write(file); |
| 1058 | |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1059 | out: |
Al Viro | 0504c07 | 2015-03-21 19:40:11 -0400 | [diff] [blame^] | 1060 | kfree(iov); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1061 | if ((ret + (type == READ)) > 0) { |
| 1062 | if (type == READ) |
| 1063 | fsnotify_access(file); |
| 1064 | else |
| 1065 | fsnotify_modify(file); |
| 1066 | } |
| 1067 | return ret; |
| 1068 | } |
| 1069 | |
| 1070 | static size_t compat_readv(struct file *file, |
| 1071 | const struct compat_iovec __user *vec, |
| 1072 | unsigned long vlen, loff_t *pos) |
| 1073 | { |
| 1074 | ssize_t ret = -EBADF; |
| 1075 | |
| 1076 | if (!(file->f_mode & FMODE_READ)) |
| 1077 | goto out; |
| 1078 | |
| 1079 | ret = -EINVAL; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 1080 | if (!(file->f_mode & FMODE_CAN_READ)) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1081 | goto out; |
| 1082 | |
| 1083 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
| 1084 | |
| 1085 | out: |
| 1086 | if (ret > 0) |
| 1087 | add_rchar(current, ret); |
| 1088 | inc_syscr(current); |
| 1089 | return ret; |
| 1090 | } |
| 1091 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1092 | COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1093 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1094 | compat_ulong_t, vlen) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1095 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1096 | struct fd f = fdget_pos(fd); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1097 | ssize_t ret; |
| 1098 | loff_t pos; |
| 1099 | |
| 1100 | if (!f.file) |
| 1101 | return -EBADF; |
| 1102 | pos = f.file->f_pos; |
| 1103 | ret = compat_readv(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 1104 | if (ret >= 0) |
| 1105 | f.file->f_pos = pos; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1106 | fdput_pos(f); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1107 | return ret; |
| 1108 | } |
| 1109 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1110 | static long __compat_sys_preadv64(unsigned long fd, |
| 1111 | const struct compat_iovec __user *vec, |
| 1112 | unsigned long vlen, loff_t pos) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1113 | { |
| 1114 | struct fd f; |
| 1115 | ssize_t ret; |
| 1116 | |
| 1117 | if (pos < 0) |
| 1118 | return -EINVAL; |
| 1119 | f = fdget(fd); |
| 1120 | if (!f.file) |
| 1121 | return -EBADF; |
| 1122 | ret = -ESPIPE; |
| 1123 | if (f.file->f_mode & FMODE_PREAD) |
| 1124 | ret = compat_readv(f.file, vec, vlen, &pos); |
| 1125 | fdput(f); |
| 1126 | return ret; |
| 1127 | } |
| 1128 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1129 | #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 |
| 1130 | COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, |
| 1131 | const struct compat_iovec __user *,vec, |
| 1132 | unsigned long, vlen, loff_t, pos) |
| 1133 | { |
| 1134 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
| 1135 | } |
| 1136 | #endif |
| 1137 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1138 | COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1139 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1140 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1141 | { |
| 1142 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1143 | |
| 1144 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1145 | } |
| 1146 | |
| 1147 | static size_t compat_writev(struct file *file, |
| 1148 | const struct compat_iovec __user *vec, |
| 1149 | unsigned long vlen, loff_t *pos) |
| 1150 | { |
| 1151 | ssize_t ret = -EBADF; |
| 1152 | |
| 1153 | if (!(file->f_mode & FMODE_WRITE)) |
| 1154 | goto out; |
| 1155 | |
| 1156 | ret = -EINVAL; |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 1157 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1158 | goto out; |
| 1159 | |
| 1160 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
| 1161 | |
| 1162 | out: |
| 1163 | if (ret > 0) |
| 1164 | add_wchar(current, ret); |
| 1165 | inc_syscw(current); |
| 1166 | return ret; |
| 1167 | } |
| 1168 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1169 | COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1170 | const struct compat_iovec __user *, vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1171 | compat_ulong_t, vlen) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1172 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1173 | struct fd f = fdget_pos(fd); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1174 | ssize_t ret; |
| 1175 | loff_t pos; |
| 1176 | |
| 1177 | if (!f.file) |
| 1178 | return -EBADF; |
| 1179 | pos = f.file->f_pos; |
| 1180 | ret = compat_writev(f.file, vec, vlen, &pos); |
Al Viro | 5faf153 | 2013-06-15 05:49:36 +0400 | [diff] [blame] | 1181 | if (ret >= 0) |
| 1182 | f.file->f_pos = pos; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 1183 | fdput_pos(f); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1184 | return ret; |
| 1185 | } |
| 1186 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1187 | static long __compat_sys_pwritev64(unsigned long fd, |
| 1188 | const struct compat_iovec __user *vec, |
| 1189 | unsigned long vlen, loff_t pos) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1190 | { |
| 1191 | struct fd f; |
| 1192 | ssize_t ret; |
| 1193 | |
| 1194 | if (pos < 0) |
| 1195 | return -EINVAL; |
| 1196 | f = fdget(fd); |
| 1197 | if (!f.file) |
| 1198 | return -EBADF; |
| 1199 | ret = -ESPIPE; |
| 1200 | if (f.file->f_mode & FMODE_PWRITE) |
| 1201 | ret = compat_writev(f.file, vec, vlen, &pos); |
| 1202 | fdput(f); |
| 1203 | return ret; |
| 1204 | } |
| 1205 | |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1206 | #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 |
| 1207 | COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, |
| 1208 | const struct compat_iovec __user *,vec, |
| 1209 | unsigned long, vlen, loff_t, pos) |
| 1210 | { |
| 1211 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
| 1212 | } |
| 1213 | #endif |
| 1214 | |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1215 | COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1216 | const struct compat_iovec __user *,vec, |
Heiko Carstens | dfd948e | 2014-01-29 14:05:44 -0800 | [diff] [blame] | 1217 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1218 | { |
| 1219 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
Heiko Carstens | 378a10f | 2014-03-05 10:43:51 +0100 | [diff] [blame] | 1220 | |
| 1221 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
Al Viro | 72ec351 | 2013-03-20 10:42:10 -0400 | [diff] [blame] | 1222 | } |
| 1223 | #endif |
| 1224 | |
Al Viro | 19f4fc3 | 2013-02-24 02:17:03 -0500 | [diff] [blame] | 1225 | static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, |
| 1226 | size_t count, loff_t max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1228 | struct fd in, out; |
| 1229 | struct inode *in_inode, *out_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | loff_t pos; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1231 | loff_t out_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | ssize_t retval; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1233 | int fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
| 1235 | /* |
| 1236 | * Get input file, and verify that it is ok.. |
| 1237 | */ |
| 1238 | retval = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1239 | in = fdget(in_fd); |
| 1240 | if (!in.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | goto out; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1242 | if (!(in.file->f_mode & FMODE_READ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | goto fput_in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | retval = -ESPIPE; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1245 | if (!ppos) { |
| 1246 | pos = in.file->f_pos; |
| 1247 | } else { |
| 1248 | pos = *ppos; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1249 | if (!(in.file->f_mode & FMODE_PREAD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | goto fput_in; |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1251 | } |
| 1252 | retval = rw_verify_area(READ, in.file, &pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1253 | if (retval < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | goto fput_in; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1255 | count = retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | /* |
| 1258 | * Get output file, and verify that it is ok.. |
| 1259 | */ |
| 1260 | retval = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1261 | out = fdget(out_fd); |
| 1262 | if (!out.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | goto fput_in; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1264 | if (!(out.file->f_mode & FMODE_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | goto fput_out; |
| 1266 | retval = -EINVAL; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1267 | in_inode = file_inode(in.file); |
| 1268 | out_inode = file_inode(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1269 | out_pos = out.file->f_pos; |
| 1270 | retval = rw_verify_area(WRITE, out.file, &out_pos, count); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1271 | if (retval < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | goto fput_out; |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1273 | count = retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | if (!max) |
| 1276 | max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); |
| 1277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | if (unlikely(pos + count > max)) { |
| 1279 | retval = -EOVERFLOW; |
| 1280 | if (pos >= max) |
| 1281 | goto fput_out; |
| 1282 | count = max - pos; |
| 1283 | } |
| 1284 | |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1285 | fl = 0; |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 1286 | #if 0 |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1287 | /* |
| 1288 | * We need to debate whether we can enable this or not. The |
| 1289 | * man page documents EAGAIN return for the output at least, |
| 1290 | * and the application is arguably buggy if it doesn't expect |
| 1291 | * EAGAIN on a non-blocking file descriptor. |
| 1292 | */ |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1293 | if (in.file->f_flags & O_NONBLOCK) |
Jens Axboe | d96e6e7 | 2007-06-11 12:18:52 +0200 | [diff] [blame] | 1294 | fl = SPLICE_F_NONBLOCK; |
Jens Axboe | 534f2aa | 2007-06-01 14:52:37 +0200 | [diff] [blame] | 1295 | #endif |
Al Viro | 50cd2c5 | 2013-05-23 20:10:34 -0400 | [diff] [blame] | 1296 | file_start_write(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1297 | 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] | 1298 | file_end_write(out.file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
| 1300 | if (retval > 0) { |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1301 | add_rchar(current, retval); |
| 1302 | add_wchar(current, retval); |
Scott Wolchok | a68c2f1 | 2012-12-20 15:05:52 -0800 | [diff] [blame] | 1303 | fsnotify_access(in.file); |
| 1304 | fsnotify_modify(out.file); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1305 | out.file->f_pos = out_pos; |
| 1306 | if (ppos) |
| 1307 | *ppos = pos; |
| 1308 | else |
| 1309 | in.file->f_pos = pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1312 | inc_syscr(current); |
| 1313 | inc_syscw(current); |
Al Viro | 7995bd2 | 2013-06-20 18:58:36 +0400 | [diff] [blame] | 1314 | if (pos > max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | retval = -EOVERFLOW; |
| 1316 | |
| 1317 | fput_out: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1318 | fdput(out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | fput_in: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1320 | fdput(in); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | out: |
| 1322 | return retval; |
| 1323 | } |
| 1324 | |
Heiko Carstens | 002c897 | 2009-01-14 14:14:18 +0100 | [diff] [blame] | 1325 | 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] | 1326 | { |
| 1327 | loff_t pos; |
| 1328 | off_t off; |
| 1329 | ssize_t ret; |
| 1330 | |
| 1331 | if (offset) { |
| 1332 | if (unlikely(get_user(off, offset))) |
| 1333 | return -EFAULT; |
| 1334 | pos = off; |
| 1335 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1336 | if (unlikely(put_user(pos, offset))) |
| 1337 | return -EFAULT; |
| 1338 | return ret; |
| 1339 | } |
| 1340 | |
| 1341 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1342 | } |
| 1343 | |
Heiko Carstens | 002c897 | 2009-01-14 14:14:18 +0100 | [diff] [blame] | 1344 | 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] | 1345 | { |
| 1346 | loff_t pos; |
| 1347 | ssize_t ret; |
| 1348 | |
| 1349 | if (offset) { |
| 1350 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1351 | return -EFAULT; |
| 1352 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1353 | if (unlikely(put_user(pos, offset))) |
| 1354 | return -EFAULT; |
| 1355 | return ret; |
| 1356 | } |
| 1357 | |
| 1358 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1359 | } |
Al Viro | 19f4fc3 | 2013-02-24 02:17:03 -0500 | [diff] [blame] | 1360 | |
| 1361 | #ifdef CONFIG_COMPAT |
| 1362 | COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, |
| 1363 | compat_off_t __user *, offset, compat_size_t, count) |
| 1364 | { |
| 1365 | loff_t pos; |
| 1366 | off_t off; |
| 1367 | ssize_t ret; |
| 1368 | |
| 1369 | if (offset) { |
| 1370 | if (unlikely(get_user(off, offset))) |
| 1371 | return -EFAULT; |
| 1372 | pos = off; |
| 1373 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1374 | if (unlikely(put_user(pos, offset))) |
| 1375 | return -EFAULT; |
| 1376 | return ret; |
| 1377 | } |
| 1378 | |
| 1379 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1380 | } |
| 1381 | |
| 1382 | COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, |
| 1383 | compat_loff_t __user *, offset, compat_size_t, count) |
| 1384 | { |
| 1385 | loff_t pos; |
| 1386 | ssize_t ret; |
| 1387 | |
| 1388 | if (offset) { |
| 1389 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1390 | return -EFAULT; |
| 1391 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1392 | if (unlikely(put_user(pos, offset))) |
| 1393 | return -EFAULT; |
| 1394 | return ret; |
| 1395 | } |
| 1396 | |
| 1397 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1398 | } |
| 1399 | #endif |