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fs/read_write.c
40.6 KB
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/* * linux/fs/read_write.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <linux/slab.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/file.h> #include <linux/uio.h> |
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#include <linux/fsnotify.h> |
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#include <linux/security.h> |
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#include <linux/export.h> |
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#include <linux/syscalls.h> |
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#include <linux/pagemap.h> |
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#include <linux/splice.h> |
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#include <linux/compat.h> |
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#include <linux/mount.h> |
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#include <linux/fs.h> |
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#include "internal.h" |
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#include <asm/uaccess.h> #include <asm/unistd.h> |
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typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
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typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); |
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|
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const struct file_operations generic_ro_fops = { |
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.llseek = generic_file_llseek, |
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.read_iter = generic_file_read_iter, |
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.mmap = generic_file_readonly_mmap, |
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.splice_read = generic_file_splice_read, |
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}; EXPORT_SYMBOL(generic_ro_fops); |
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static inline int unsigned_offsets(struct file *file) |
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{ |
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return file->f_mode & FMODE_UNSIGNED_OFFSET; |
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} |
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/** * vfs_setpos - update the file offset for lseek * @file: file structure in question * @offset: file offset to seek to * @maxsize: maximum file size * * This is a low-level filesystem helper for updating the file offset to * the value specified by @offset if the given offset is valid and it is * not equal to the current file offset. * * Return the specified offset on success and -EINVAL on invalid offset. */ loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) |
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{ if (offset < 0 && !unsigned_offsets(file)) return -EINVAL; if (offset > maxsize) return -EINVAL; if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } return offset; } |
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EXPORT_SYMBOL(vfs_setpos); |
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/** |
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* generic_file_llseek_size - generic llseek implementation for regular files |
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* @file: file structure to seek on * @offset: file offset to seek to |
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* @whence: type of seek |
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* @size: max size of this file in file system * @eof: offset used for SEEK_END position |
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* |
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* This is a variant of generic_file_llseek that allows passing in a custom |
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* maximum file size and a custom EOF position, for e.g. hashed directories |
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* * Synchronization: |
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* SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
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* SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. * read/writes behave like SEEK_SET against seeks. |
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*/ |
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loff_t |
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generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
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loff_t maxsize, loff_t eof) |
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{ |
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switch (whence) { |
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case SEEK_END: |
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offset += eof; |
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break; case SEEK_CUR: |
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/* * Here we special-case the lseek(fd, 0, SEEK_CUR) * position-querying operation. Avoid rewriting the "same" * f_pos value back to the file because a concurrent read(), * write() or lseek() might have altered it */ if (offset == 0) return file->f_pos; |
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/* * f_lock protects against read/modify/write race with other * SEEK_CURs. Note that parallel writes and reads behave * like SEEK_SET. */ spin_lock(&file->f_lock); |
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offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
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spin_unlock(&file->f_lock); return offset; |
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case SEEK_DATA: /* * In the generic case the entire file is data, so as long as * offset isn't at the end of the file then the offset is data. */ |
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if (offset >= eof) |
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return -ENXIO; break; case SEEK_HOLE: /* * There is a virtual hole at the end of the file, so as long as * offset isn't i_size or larger, return i_size. */ |
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if (offset >= eof) |
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return -ENXIO; |
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offset = eof; |
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break; |
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} |
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return vfs_setpos(file, offset, maxsize); |
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} EXPORT_SYMBOL(generic_file_llseek_size); /** * generic_file_llseek - generic llseek implementation for regular files * @file: file structure to seek on * @offset: file offset to seek to |
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* @whence: type of seek |
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* * This is a generic implemenation of ->llseek useable for all normal local * filesystems. It just updates the file offset to the value specified by |
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* @offset and @whence. |
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*/ |
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loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) |
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{ struct inode *inode = file->f_mapping->host; |
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return generic_file_llseek_size(file, offset, whence, |
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inode->i_sb->s_maxbytes, i_size_read(inode)); |
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} |
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EXPORT_SYMBOL(generic_file_llseek); |
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/** |
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* fixed_size_llseek - llseek implementation for fixed-sized devices * @file: file structure to seek on * @offset: file offset to seek to * @whence: type of seek * @size: size of the file * */ loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) { switch (whence) { case SEEK_SET: case SEEK_CUR: case SEEK_END: return generic_file_llseek_size(file, offset, whence, size, size); default: return -EINVAL; } } EXPORT_SYMBOL(fixed_size_llseek); /** |
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* no_seek_end_llseek - llseek implementation for fixed-sized devices * @file: file structure to seek on * @offset: file offset to seek to * @whence: type of seek * */ loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence) { switch (whence) { case SEEK_SET: case SEEK_CUR: return generic_file_llseek_size(file, offset, whence, |
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OFFSET_MAX, 0); |
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default: return -EINVAL; } } EXPORT_SYMBOL(no_seek_end_llseek); /** * no_seek_end_llseek_size - llseek implementation for fixed-sized devices * @file: file structure to seek on * @offset: file offset to seek to * @whence: type of seek * @size: maximal offset allowed * */ loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size) { switch (whence) { case SEEK_SET: case SEEK_CUR: return generic_file_llseek_size(file, offset, whence, size, 0); default: return -EINVAL; } } EXPORT_SYMBOL(no_seek_end_llseek_size); /** |
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* noop_llseek - No Operation Performed llseek implementation * @file: file structure to seek on * @offset: file offset to seek to |
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* @whence: type of seek |
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* * This is an implementation of ->llseek useable for the rare special case when * userspace expects the seek to succeed but the (device) file is actually not * able to perform the seek. In this case you use noop_llseek() instead of * falling back to the default implementation of ->llseek. */ |
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loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
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{ return file->f_pos; } EXPORT_SYMBOL(noop_llseek); |
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loff_t no_llseek(struct file *file, loff_t offset, int whence) |
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{ return -ESPIPE; } EXPORT_SYMBOL(no_llseek); |
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loff_t default_llseek(struct file *file, loff_t offset, int whence) |
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{ |
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struct inode *inode = file_inode(file); |
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loff_t retval; |
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|
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inode_lock(inode); |
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switch (whence) { |
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case SEEK_END: |
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offset += i_size_read(inode); |
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break; |
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case SEEK_CUR: |
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if (offset == 0) { retval = file->f_pos; goto out; } |
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offset += file->f_pos; |
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break; case SEEK_DATA: /* * In the generic case the entire file is data, so as * long as offset isn't at the end of the file then the * offset is data. */ |
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if (offset >= inode->i_size) { retval = -ENXIO; goto out; } |
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break; case SEEK_HOLE: /* * There is a virtual hole at the end of the file, so * as long as offset isn't i_size or larger, return * i_size. */ |
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if (offset >= inode->i_size) { retval = -ENXIO; goto out; } |
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offset = inode->i_size; break; |
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} retval = -EINVAL; |
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if (offset >= 0 || unsigned_offsets(file)) { |
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if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } retval = offset; } |
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out: |
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inode_unlock(inode); |
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return retval; } EXPORT_SYMBOL(default_llseek); |
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loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
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{ loff_t (*fn)(struct file *, loff_t, int); fn = no_llseek; if (file->f_mode & FMODE_LSEEK) { |
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if (file->f_op->llseek) |
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fn = file->f_op->llseek; } |
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return fn(file, offset, whence); |
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} EXPORT_SYMBOL(vfs_llseek); |
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SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
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{ off_t retval; |
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struct fd f = fdget_pos(fd); |
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if (!f.file) return -EBADF; |
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retval = -EINVAL; |
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if (whence <= SEEK_MAX) { loff_t res = vfs_llseek(f.file, offset, whence); |
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retval = res; if (res != (loff_t)retval) retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ } |
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fdput_pos(f); |
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return retval; } |
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#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) { return sys_lseek(fd, offset, whence); } #endif |
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#ifdef __ARCH_WANT_SYS_LLSEEK |
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SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, unsigned long, offset_low, loff_t __user *, result, |
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unsigned int, whence) |
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{ int retval; |
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struct fd f = fdget_pos(fd); |
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loff_t offset; |
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|
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if (!f.file) return -EBADF; |
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retval = -EINVAL; |
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if (whence > SEEK_MAX) |
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goto out_putf; |
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offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
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whence); |
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retval = (int)offset; if (offset >= 0) { retval = -EFAULT; if (!copy_to_user(result, &offset, sizeof(offset))) retval = 0; } out_putf: |
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fdput_pos(f); |
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return retval; } #endif |
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ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos) { struct kiocb kiocb; ssize_t ret; if (!file->f_op->read_iter) return -EINVAL; init_sync_kiocb(&kiocb, file); kiocb.ki_pos = *ppos; |
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iter->type |= READ; ret = file->f_op->read_iter(&kiocb, iter); |
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BUG_ON(ret == -EIOCBQUEUED); |
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if (ret > 0) *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(vfs_iter_read); ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos) { struct kiocb kiocb; ssize_t ret; if (!file->f_op->write_iter) return -EINVAL; init_sync_kiocb(&kiocb, file); kiocb.ki_pos = *ppos; |
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iter->type |= WRITE; ret = file->f_op->write_iter(&kiocb, iter); |
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BUG_ON(ret == -EIOCBQUEUED); |
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if (ret > 0) *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(vfs_iter_write); |
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int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) |
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{ struct inode *inode; loff_t pos; |
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int retval = -EINVAL; |
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|
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inode = file_inode(file); |
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if (unlikely((ssize_t) count < 0)) |
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return retval; |
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pos = *ppos; |
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if (unlikely(pos < 0)) { if (!unsigned_offsets(file)) return retval; if (count >= -pos) /* both values are in 0..LLONG_MAX */ return -EOVERFLOW; } else if (unlikely((loff_t) (pos + count) < 0)) { if (!unsigned_offsets(file)) |
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return retval; } |
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|
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if (unlikely(inode->i_flctx && mandatory_lock(inode))) { |
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retval = locks_mandatory_area(inode, file, pos, pos + count - 1, read_write == READ ? F_RDLCK : F_WRLCK); |
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if (retval < 0) return retval; } |
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return security_file_permission(file, |
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read_write == READ ? MAY_READ : MAY_WRITE); |
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} |
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static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
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{ struct iovec iov = { .iov_base = buf, .iov_len = len }; struct kiocb kiocb; struct iov_iter iter; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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iov_iter_init(&iter, READ, &iov, 1, len); ret = filp->f_op->read_iter(&kiocb, &iter); |
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BUG_ON(ret == -EIOCBQUEUED); |
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*ppos = kiocb.ki_pos; return ret; } |
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ssize_t __vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { |
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if (file->f_op->read) |
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return file->f_op->read(file, buf, count, pos); |
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else if (file->f_op->read_iter) |
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return new_sync_read(file, buf, count, pos); |
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else |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL(__vfs_read); |
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|
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ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_READ)) return -EBADF; |
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if (!(file->f_mode & FMODE_CAN_READ)) |
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return -EINVAL; if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) return -EFAULT; ret = rw_verify_area(READ, file, pos, count); |
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if (!ret) { if (count > MAX_RW_COUNT) count = MAX_RW_COUNT; |
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ret = __vfs_read(file, buf, count, pos); |
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if (ret > 0) { |
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fsnotify_access(file); |
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add_rchar(current, ret); |
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} |
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inc_syscr(current); |
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} return ret; } EXPORT_SYMBOL(vfs_read); |
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static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
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{ struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; struct kiocb kiocb; struct iov_iter iter; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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iov_iter_init(&iter, WRITE, &iov, 1, len); ret = filp->f_op->write_iter(&kiocb, &iter); |
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BUG_ON(ret == -EIOCBQUEUED); |
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if (ret > 0) *ppos = kiocb.ki_pos; |
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return ret; } |
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ssize_t __vfs_write(struct file *file, const char __user *p, size_t count, loff_t *pos) { if (file->f_op->write) return file->f_op->write(file, p, count, pos); |
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else if (file->f_op->write_iter) return new_sync_write(file, p, count, pos); else return -EINVAL; } EXPORT_SYMBOL(__vfs_write); |
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ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) { mm_segment_t old_fs; const char __user *p; ssize_t ret; |
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if (!(file->f_mode & FMODE_CAN_WRITE)) |
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return -EINVAL; |
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|
507 508 509 510 511 |
old_fs = get_fs(); set_fs(get_ds()); p = (__force const char __user *)buf; if (count > MAX_RW_COUNT) count = MAX_RW_COUNT; |
493c84c07
|
512 |
ret = __vfs_write(file, p, count, pos); |
06ae43f34
|
513 514 515 516 517 518 519 520 |
set_fs(old_fs); if (ret > 0) { fsnotify_modify(file); add_wchar(current, ret); } inc_syscw(current); return ret; } |
2ec3a12a6
|
521 |
EXPORT_SYMBOL(__kernel_write); |
1da177e4c
|
522 523 524 525 526 527 |
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_WRITE)) return -EBADF; |
7f7f25e82
|
528 |
if (!(file->f_mode & FMODE_CAN_WRITE)) |
1da177e4c
|
529 530 531 532 533 |
return -EINVAL; if (unlikely(!access_ok(VERIFY_READ, buf, count))) return -EFAULT; ret = rw_verify_area(WRITE, file, pos, count); |
bc61384dc
|
534 535 536 |
if (!ret) { if (count > MAX_RW_COUNT) count = MAX_RW_COUNT; |
03d95eb2f
|
537 |
file_start_write(file); |
493c84c07
|
538 |
ret = __vfs_write(file, buf, count, pos); |
c43e259cc
|
539 |
if (ret > 0) { |
2a12a9d78
|
540 |
fsnotify_modify(file); |
c43e259cc
|
541 |
add_wchar(current, ret); |
1da177e4c
|
542 |
} |
c43e259cc
|
543 |
inc_syscw(current); |
03d95eb2f
|
544 |
file_end_write(file); |
1da177e4c
|
545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 |
} return ret; } EXPORT_SYMBOL(vfs_write); static inline loff_t file_pos_read(struct file *file) { return file->f_pos; } static inline void file_pos_write(struct file *file, loff_t pos) { file->f_pos = pos; } |
3cdad4288
|
561 |
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
1da177e4c
|
562 |
{ |
9c225f265
|
563 |
struct fd f = fdget_pos(fd); |
1da177e4c
|
564 |
ssize_t ret = -EBADF; |
1da177e4c
|
565 |
|
2903ff019
|
566 567 568 |
if (f.file) { loff_t pos = file_pos_read(f.file); ret = vfs_read(f.file, buf, count, &pos); |
5faf153eb
|
569 570 |
if (ret >= 0) file_pos_write(f.file, pos); |
9c225f265
|
571 |
fdput_pos(f); |
1da177e4c
|
572 |
} |
1da177e4c
|
573 574 |
return ret; } |
1da177e4c
|
575 |
|
3cdad4288
|
576 577 |
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, size_t, count) |
1da177e4c
|
578 |
{ |
9c225f265
|
579 |
struct fd f = fdget_pos(fd); |
1da177e4c
|
580 |
ssize_t ret = -EBADF; |
1da177e4c
|
581 |
|
2903ff019
|
582 583 584 |
if (f.file) { loff_t pos = file_pos_read(f.file); ret = vfs_write(f.file, buf, count, &pos); |
5faf153eb
|
585 586 |
if (ret >= 0) file_pos_write(f.file, pos); |
9c225f265
|
587 |
fdput_pos(f); |
1da177e4c
|
588 589 590 591 |
} return ret; } |
4a0fd5bf0
|
592 593 |
SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, size_t, count, loff_t, pos) |
1da177e4c
|
594 |
{ |
2903ff019
|
595 |
struct fd f; |
1da177e4c
|
596 |
ssize_t ret = -EBADF; |
1da177e4c
|
597 598 599 |
if (pos < 0) return -EINVAL; |
2903ff019
|
600 601 |
f = fdget(fd); if (f.file) { |
1da177e4c
|
602 |
ret = -ESPIPE; |
2903ff019
|
603 604 605 |
if (f.file->f_mode & FMODE_PREAD) ret = vfs_read(f.file, buf, count, &pos); fdput(f); |
1da177e4c
|
606 607 608 609 |
} return ret; } |
4a0fd5bf0
|
610 611 |
SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, size_t, count, loff_t, pos) |
1da177e4c
|
612 |
{ |
2903ff019
|
613 |
struct fd f; |
1da177e4c
|
614 |
ssize_t ret = -EBADF; |
1da177e4c
|
615 616 617 |
if (pos < 0) return -EINVAL; |
2903ff019
|
618 619 |
f = fdget(fd); if (f.file) { |
1da177e4c
|
620 |
ret = -ESPIPE; |
2903ff019
|
621 622 623 |
if (f.file->f_mode & FMODE_PWRITE) ret = vfs_write(f.file, buf, count, &pos); fdput(f); |
1da177e4c
|
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 |
} return ret; } /* * Reduce an iovec's length in-place. Return the resulting number of segments */ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) { unsigned long seg = 0; size_t len = 0; while (seg < nr_segs) { seg++; if (len + iov->iov_len >= to) { iov->iov_len = to - len; break; } len += iov->iov_len; iov++; } return seg; } |
19295529d
|
648 |
EXPORT_SYMBOL(iov_shorten); |
1da177e4c
|
649 |
|
ac15ac066
|
650 |
static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, |
793b80ef1
|
651 |
loff_t *ppos, iter_fn_t fn, int flags) |
293bc9822
|
652 653 |
{ struct kiocb kiocb; |
293bc9822
|
654 |
ssize_t ret; |
e864f3956
|
655 |
if (flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC)) |
793b80ef1
|
656 |
return -EOPNOTSUPP; |
293bc9822
|
657 |
init_sync_kiocb(&kiocb, filp); |
97be7ebe5
|
658 659 |
if (flags & RWF_HIPRI) kiocb.ki_flags |= IOCB_HIPRI; |
e864f3956
|
660 661 662 663 |
if (flags & RWF_DSYNC) kiocb.ki_flags |= IOCB_DSYNC; if (flags & RWF_SYNC) kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC); |
293bc9822
|
664 |
kiocb.ki_pos = *ppos; |
293bc9822
|
665 |
|
ac15ac066
|
666 |
ret = fn(&kiocb, iter); |
599bd19bd
|
667 |
BUG_ON(ret == -EIOCBQUEUED); |
293bc9822
|
668 669 670 |
*ppos = kiocb.ki_pos; return ret; } |
ee0b3e671
|
671 |
/* Do it by hand, with file-ops */ |
ac15ac066
|
672 |
static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, |
793b80ef1
|
673 |
loff_t *ppos, io_fn_t fn, int flags) |
ee0b3e671
|
674 |
{ |
ee0b3e671
|
675 |
ssize_t ret = 0; |
97be7ebe5
|
676 |
if (flags & ~RWF_HIPRI) |
793b80ef1
|
677 |
return -EOPNOTSUPP; |
ac15ac066
|
678 679 |
while (iov_iter_count(iter)) { struct iovec iovec = iov_iter_iovec(iter); |
ee0b3e671
|
680 |
ssize_t nr; |
ac15ac066
|
681 |
nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos); |
ee0b3e671
|
682 683 684 685 686 687 688 |
if (nr < 0) { if (!ret) ret = nr; break; } ret += nr; |
ac15ac066
|
689 |
if (nr != iovec.iov_len) |
ee0b3e671
|
690 |
break; |
ac15ac066
|
691 |
iov_iter_advance(iter, nr); |
ee0b3e671
|
692 693 694 695 |
} return ret; } |
1da177e4c
|
696 697 |
/* A write operation does a read from user space and vice versa */ #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
ffecee4f2
|
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 |
/** * rw_copy_check_uvector() - Copy an array of &struct iovec from userspace * into the kernel and check that it is valid. * * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE. * @uvector: Pointer to the userspace array. * @nr_segs: Number of elements in userspace array. * @fast_segs: Number of elements in @fast_pointer. * @fast_pointer: Pointer to (usually small on-stack) kernel array. * @ret_pointer: (output parameter) Pointer to a variable that will point to * either @fast_pointer, a newly allocated kernel array, or NULL, * depending on which array was used. * * This function copies an array of &struct iovec of @nr_segs from * userspace into the kernel and checks that each element is valid (e.g. * it does not point to a kernel address or cause overflow by being too * large, etc.). * * As an optimization, the caller may provide a pointer to a small * on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long * (the size of this array, or 0 if unused, should be given in @fast_segs). * * @ret_pointer will always point to the array that was used, so the * caller must take care not to call kfree() on it e.g. in case the * @fast_pointer array was used and it was allocated on the stack. * * Return: The total number of bytes covered by the iovec array on success * or a negative error code on error. */ |
eed4e51fb
|
727 728 729 |
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, |
ac34ebb3a
|
730 |
struct iovec **ret_pointer) |
435f49a51
|
731 |
{ |
eed4e51fb
|
732 |
unsigned long seg; |
435f49a51
|
733 |
ssize_t ret; |
eed4e51fb
|
734 |
struct iovec *iov = fast_pointer; |
435f49a51
|
735 736 737 738 739 |
/* * SuS says "The readv() function *may* fail if the iovcnt argument * was less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... */ |
eed4e51fb
|
740 741 |
if (nr_segs == 0) { ret = 0; |
435f49a51
|
742 |
goto out; |
eed4e51fb
|
743 |
} |
435f49a51
|
744 745 746 747 |
/* * First get the "struct iovec" from user memory and * verify all the pointers */ |
eed4e51fb
|
748 749 |
if (nr_segs > UIO_MAXIOV) { ret = -EINVAL; |
435f49a51
|
750 |
goto out; |
eed4e51fb
|
751 752 |
} if (nr_segs > fast_segs) { |
435f49a51
|
753 |
iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
eed4e51fb
|
754 755 |
if (iov == NULL) { ret = -ENOMEM; |
435f49a51
|
756 |
goto out; |
eed4e51fb
|
757 |
} |
435f49a51
|
758 |
} |
eed4e51fb
|
759 760 |
if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { ret = -EFAULT; |
435f49a51
|
761 |
goto out; |
eed4e51fb
|
762 |
} |
435f49a51
|
763 |
/* |
eed4e51fb
|
764 765 766 767 |
* According to the Single Unix Specification we should return EINVAL * if an element length is < 0 when cast to ssize_t or if the * total length would overflow the ssize_t return value of the * system call. |
435f49a51
|
768 769 770 771 |
* * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the * overflow case. */ |
eed4e51fb
|
772 |
ret = 0; |
435f49a51
|
773 774 775 |
for (seg = 0; seg < nr_segs; seg++) { void __user *buf = iov[seg].iov_base; ssize_t len = (ssize_t)iov[seg].iov_len; |
eed4e51fb
|
776 777 778 |
/* see if we we're about to use an invalid len or if * it's about to overflow ssize_t */ |
435f49a51
|
779 |
if (len < 0) { |
eed4e51fb
|
780 |
ret = -EINVAL; |
435f49a51
|
781 |
goto out; |
eed4e51fb
|
782 |
} |
ac34ebb3a
|
783 |
if (type >= 0 |
fcf634098
|
784 |
&& unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
eed4e51fb
|
785 |
ret = -EFAULT; |
435f49a51
|
786 787 788 789 790 |
goto out; } if (len > MAX_RW_COUNT - ret) { len = MAX_RW_COUNT - ret; iov[seg].iov_len = len; |
eed4e51fb
|
791 |
} |
eed4e51fb
|
792 |
ret += len; |
435f49a51
|
793 |
} |
eed4e51fb
|
794 795 796 797 |
out: *ret_pointer = iov; return ret; } |
1da177e4c
|
798 799 |
static ssize_t do_readv_writev(int type, struct file *file, const struct iovec __user * uvector, |
793b80ef1
|
800 801 |
unsigned long nr_segs, loff_t *pos, int flags) |
1da177e4c
|
802 |
{ |
1da177e4c
|
803 804 |
size_t tot_len; struct iovec iovstack[UIO_FASTIOV]; |
ee0b3e671
|
805 |
struct iovec *iov = iovstack; |
ac15ac066
|
806 |
struct iov_iter iter; |
1da177e4c
|
807 |
ssize_t ret; |
1da177e4c
|
808 |
io_fn_t fn; |
293bc9822
|
809 |
iter_fn_t iter_fn; |
1da177e4c
|
810 |
|
0504c074b
|
811 812 813 814 |
ret = import_iovec(type, uvector, nr_segs, ARRAY_SIZE(iovstack), &iov, &iter); if (ret < 0) return ret; |
1da177e4c
|
815 |
|
0504c074b
|
816 817 818 |
tot_len = iov_iter_count(&iter); if (!tot_len) goto out; |
1da177e4c
|
819 |
ret = rw_verify_area(type, file, pos, tot_len); |
e28cc7157
|
820 |
if (ret < 0) |
1da177e4c
|
821 |
goto out; |
1da177e4c
|
822 823 |
if (type == READ) { fn = file->f_op->read; |
293bc9822
|
824 |
iter_fn = file->f_op->read_iter; |
1da177e4c
|
825 826 |
} else { fn = (io_fn_t)file->f_op->write; |
293bc9822
|
827 |
iter_fn = file->f_op->write_iter; |
03d95eb2f
|
828 |
file_start_write(file); |
1da177e4c
|
829 |
} |
293bc9822
|
830 |
if (iter_fn) |
793b80ef1
|
831 |
ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); |
ee0b3e671
|
832 |
else |
793b80ef1
|
833 |
ret = do_loop_readv_writev(file, &iter, pos, fn, flags); |
1da177e4c
|
834 |
|
03d95eb2f
|
835 836 |
if (type != READ) file_end_write(file); |
1da177e4c
|
837 |
out: |
0504c074b
|
838 |
kfree(iov); |
0eeca2830
|
839 840 |
if ((ret + (type == READ)) > 0) { if (type == READ) |
2a12a9d78
|
841 |
fsnotify_access(file); |
0eeca2830
|
842 |
else |
2a12a9d78
|
843 |
fsnotify_modify(file); |
0eeca2830
|
844 |
} |
1da177e4c
|
845 |
return ret; |
1da177e4c
|
846 847 848 |
} ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, |
793b80ef1
|
849 |
unsigned long vlen, loff_t *pos, int flags) |
1da177e4c
|
850 851 852 |
{ if (!(file->f_mode & FMODE_READ)) return -EBADF; |
7f7f25e82
|
853 |
if (!(file->f_mode & FMODE_CAN_READ)) |
1da177e4c
|
854 |
return -EINVAL; |
793b80ef1
|
855 |
return do_readv_writev(READ, file, vec, vlen, pos, flags); |
1da177e4c
|
856 857 858 859 860 |
} EXPORT_SYMBOL(vfs_readv); ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, |
793b80ef1
|
861 |
unsigned long vlen, loff_t *pos, int flags) |
1da177e4c
|
862 863 864 |
{ if (!(file->f_mode & FMODE_WRITE)) return -EBADF; |
7f7f25e82
|
865 |
if (!(file->f_mode & FMODE_CAN_WRITE)) |
1da177e4c
|
866 |
return -EINVAL; |
793b80ef1
|
867 |
return do_readv_writev(WRITE, file, vec, vlen, pos, flags); |
1da177e4c
|
868 869 870 |
} EXPORT_SYMBOL(vfs_writev); |
f17d8b354
|
871 872 |
static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, int flags) |
1da177e4c
|
873 |
{ |
9c225f265
|
874 |
struct fd f = fdget_pos(fd); |
1da177e4c
|
875 |
ssize_t ret = -EBADF; |
1da177e4c
|
876 |
|
2903ff019
|
877 878 |
if (f.file) { loff_t pos = file_pos_read(f.file); |
f17d8b354
|
879 |
ret = vfs_readv(f.file, vec, vlen, &pos, flags); |
5faf153eb
|
880 881 |
if (ret >= 0) file_pos_write(f.file, pos); |
9c225f265
|
882 |
fdput_pos(f); |
1da177e4c
|
883 884 885 |
} if (ret > 0) |
4b98d11b4
|
886 887 |
add_rchar(current, ret); inc_syscr(current); |
1da177e4c
|
888 889 |
return ret; } |
f17d8b354
|
890 891 |
static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, int flags) |
1da177e4c
|
892 |
{ |
9c225f265
|
893 |
struct fd f = fdget_pos(fd); |
1da177e4c
|
894 |
ssize_t ret = -EBADF; |
1da177e4c
|
895 |
|
2903ff019
|
896 897 |
if (f.file) { loff_t pos = file_pos_read(f.file); |
f17d8b354
|
898 |
ret = vfs_writev(f.file, vec, vlen, &pos, flags); |
5faf153eb
|
899 900 |
if (ret >= 0) file_pos_write(f.file, pos); |
9c225f265
|
901 |
fdput_pos(f); |
1da177e4c
|
902 903 904 |
} if (ret > 0) |
4b98d11b4
|
905 906 |
add_wchar(current, ret); inc_syscw(current); |
1da177e4c
|
907 908 |
return ret; } |
601cc11d0
|
909 910 911 912 913 |
static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) { #define HALF_LONG_BITS (BITS_PER_LONG / 2) return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; } |
f17d8b354
|
914 915 |
static ssize_t do_preadv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, loff_t pos, int flags) |
f3554f4bc
|
916 |
{ |
2903ff019
|
917 |
struct fd f; |
f3554f4bc
|
918 |
ssize_t ret = -EBADF; |
f3554f4bc
|
919 920 921 |
if (pos < 0) return -EINVAL; |
2903ff019
|
922 923 |
f = fdget(fd); if (f.file) { |
f3554f4bc
|
924 |
ret = -ESPIPE; |
2903ff019
|
925 |
if (f.file->f_mode & FMODE_PREAD) |
f17d8b354
|
926 |
ret = vfs_readv(f.file, vec, vlen, &pos, flags); |
2903ff019
|
927 |
fdput(f); |
f3554f4bc
|
928 929 930 931 932 933 934 |
} if (ret > 0) add_rchar(current, ret); inc_syscr(current); return ret; } |
f17d8b354
|
935 936 |
static ssize_t do_pwritev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, loff_t pos, int flags) |
f3554f4bc
|
937 |
{ |
2903ff019
|
938 |
struct fd f; |
f3554f4bc
|
939 |
ssize_t ret = -EBADF; |
f3554f4bc
|
940 941 942 |
if (pos < 0) return -EINVAL; |
2903ff019
|
943 944 |
f = fdget(fd); if (f.file) { |
f3554f4bc
|
945 |
ret = -ESPIPE; |
2903ff019
|
946 |
if (f.file->f_mode & FMODE_PWRITE) |
f17d8b354
|
947 |
ret = vfs_writev(f.file, vec, vlen, &pos, flags); |
2903ff019
|
948 |
fdput(f); |
f3554f4bc
|
949 950 951 952 953 954 955 |
} if (ret > 0) add_wchar(current, ret); inc_syscw(current); return ret; } |
f17d8b354
|
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen) { return do_readv(fd, vec, vlen, 0); } SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen) { return do_writev(fd, vec, vlen, 0); } SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) { loff_t pos = pos_from_hilo(pos_h, pos_l); return do_preadv(fd, vec, vlen, pos, 0); } SYSCALL_DEFINE6(preadv2, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, int, flags) { loff_t pos = pos_from_hilo(pos_h, pos_l); if (pos == -1) return do_readv(fd, vec, vlen, flags); return do_preadv(fd, vec, vlen, pos, flags); } SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) { loff_t pos = pos_from_hilo(pos_h, pos_l); return do_pwritev(fd, vec, vlen, pos, 0); } SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, int, flags) { loff_t pos = pos_from_hilo(pos_h, pos_l); if (pos == -1) return do_writev(fd, vec, vlen, flags); return do_pwritev(fd, vec, vlen, pos, flags); } |
72ec35163
|
1007 1008 1009 1010 |
#ifdef CONFIG_COMPAT static ssize_t compat_do_readv_writev(int type, struct file *file, const struct compat_iovec __user *uvector, |
793b80ef1
|
1011 1012 |
unsigned long nr_segs, loff_t *pos, int flags) |
72ec35163
|
1013 1014 1015 1016 |
{ compat_ssize_t tot_len; struct iovec iovstack[UIO_FASTIOV]; struct iovec *iov = iovstack; |
ac15ac066
|
1017 |
struct iov_iter iter; |
72ec35163
|
1018 1019 |
ssize_t ret; io_fn_t fn; |
293bc9822
|
1020 |
iter_fn_t iter_fn; |
72ec35163
|
1021 |
|
0504c074b
|
1022 1023 1024 1025 |
ret = compat_import_iovec(type, uvector, nr_segs, UIO_FASTIOV, &iov, &iter); if (ret < 0) return ret; |
72ec35163
|
1026 |
|
0504c074b
|
1027 1028 1029 |
tot_len = iov_iter_count(&iter); if (!tot_len) goto out; |
72ec35163
|
1030 1031 1032 |
ret = rw_verify_area(type, file, pos, tot_len); if (ret < 0) goto out; |
72ec35163
|
1033 1034 |
if (type == READ) { fn = file->f_op->read; |
293bc9822
|
1035 |
iter_fn = file->f_op->read_iter; |
72ec35163
|
1036 1037 |
} else { fn = (io_fn_t)file->f_op->write; |
293bc9822
|
1038 |
iter_fn = file->f_op->write_iter; |
03d95eb2f
|
1039 |
file_start_write(file); |
72ec35163
|
1040 |
} |
293bc9822
|
1041 |
if (iter_fn) |
793b80ef1
|
1042 |
ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); |
03d95eb2f
|
1043 |
else |
793b80ef1
|
1044 |
ret = do_loop_readv_writev(file, &iter, pos, fn, flags); |
72ec35163
|
1045 |
|
03d95eb2f
|
1046 1047 |
if (type != READ) file_end_write(file); |
72ec35163
|
1048 |
out: |
0504c074b
|
1049 |
kfree(iov); |
72ec35163
|
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
if ((ret + (type == READ)) > 0) { if (type == READ) fsnotify_access(file); else fsnotify_modify(file); } return ret; } static size_t compat_readv(struct file *file, const struct compat_iovec __user *vec, |
f17d8b354
|
1061 |
unsigned long vlen, loff_t *pos, int flags) |
72ec35163
|
1062 1063 1064 1065 1066 1067 1068 |
{ ssize_t ret = -EBADF; if (!(file->f_mode & FMODE_READ)) goto out; ret = -EINVAL; |
7f7f25e82
|
1069 |
if (!(file->f_mode & FMODE_CAN_READ)) |
72ec35163
|
1070 |
goto out; |
f17d8b354
|
1071 |
ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags); |
72ec35163
|
1072 1073 1074 1075 1076 1077 1078 |
out: if (ret > 0) add_rchar(current, ret); inc_syscr(current); return ret; } |
f17d8b354
|
1079 1080 1081 |
static size_t do_compat_readv(compat_ulong_t fd, const struct compat_iovec __user *vec, compat_ulong_t vlen, int flags) |
72ec35163
|
1082 |
{ |
9c225f265
|
1083 |
struct fd f = fdget_pos(fd); |
72ec35163
|
1084 1085 1086 1087 1088 1089 |
ssize_t ret; loff_t pos; if (!f.file) return -EBADF; pos = f.file->f_pos; |
f17d8b354
|
1090 |
ret = compat_readv(f.file, vec, vlen, &pos, flags); |
5faf153eb
|
1091 1092 |
if (ret >= 0) f.file->f_pos = pos; |
9c225f265
|
1093 |
fdput_pos(f); |
72ec35163
|
1094 |
return ret; |
f17d8b354
|
1095 |
|
72ec35163
|
1096 |
} |
f17d8b354
|
1097 1098 1099 1100 1101 1102 1103 1104 |
COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, const struct compat_iovec __user *,vec, compat_ulong_t, vlen) { return do_compat_readv(fd, vec, vlen, 0); } static long do_compat_preadv64(unsigned long fd, |
378a10f3a
|
1105 |
const struct compat_iovec __user *vec, |
f17d8b354
|
1106 |
unsigned long vlen, loff_t pos, int flags) |
72ec35163
|
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 |
{ struct fd f; ssize_t ret; if (pos < 0) return -EINVAL; f = fdget(fd); if (!f.file) return -EBADF; ret = -ESPIPE; if (f.file->f_mode & FMODE_PREAD) |
f17d8b354
|
1118 |
ret = compat_readv(f.file, vec, vlen, &pos, flags); |
72ec35163
|
1119 1120 1121 |
fdput(f); return ret; } |
378a10f3a
|
1122 1123 1124 1125 1126 |
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos) { |
f17d8b354
|
1127 |
return do_compat_preadv64(fd, vec, vlen, pos, 0); |
378a10f3a
|
1128 1129 |
} #endif |
dfd948e32
|
1130 |
COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, |
72ec35163
|
1131 |
const struct compat_iovec __user *,vec, |
dfd948e32
|
1132 |
compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
72ec35163
|
1133 1134 |
{ loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
378a10f3a
|
1135 |
|
f17d8b354
|
1136 1137 |
return do_compat_preadv64(fd, vec, vlen, pos, 0); } |
3ebfd81f7
|
1138 1139 1140 1141 1142 1143 1144 1145 |
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos, int, flags) { return do_compat_preadv64(fd, vec, vlen, pos, flags); } #endif |
f17d8b354
|
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 |
COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, const struct compat_iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, int, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) return do_compat_readv(fd, vec, vlen, flags); return do_compat_preadv64(fd, vec, vlen, pos, flags); |
72ec35163
|
1157 1158 1159 1160 |
} static size_t compat_writev(struct file *file, const struct compat_iovec __user *vec, |
f17d8b354
|
1161 |
unsigned long vlen, loff_t *pos, int flags) |
72ec35163
|
1162 1163 1164 1165 1166 1167 1168 |
{ ssize_t ret = -EBADF; if (!(file->f_mode & FMODE_WRITE)) goto out; ret = -EINVAL; |
7f7f25e82
|
1169 |
if (!(file->f_mode & FMODE_CAN_WRITE)) |
72ec35163
|
1170 |
goto out; |
793b80ef1
|
1171 |
ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, 0); |
72ec35163
|
1172 1173 1174 1175 1176 1177 1178 |
out: if (ret > 0) add_wchar(current, ret); inc_syscw(current); return ret; } |
f17d8b354
|
1179 1180 1181 |
static size_t do_compat_writev(compat_ulong_t fd, const struct compat_iovec __user* vec, compat_ulong_t vlen, int flags) |
72ec35163
|
1182 |
{ |
9c225f265
|
1183 |
struct fd f = fdget_pos(fd); |
72ec35163
|
1184 1185 1186 1187 1188 1189 |
ssize_t ret; loff_t pos; if (!f.file) return -EBADF; pos = f.file->f_pos; |
f17d8b354
|
1190 |
ret = compat_writev(f.file, vec, vlen, &pos, flags); |
5faf153eb
|
1191 1192 |
if (ret >= 0) f.file->f_pos = pos; |
9c225f265
|
1193 |
fdput_pos(f); |
72ec35163
|
1194 1195 |
return ret; } |
f17d8b354
|
1196 1197 1198 1199 1200 1201 1202 1203 |
COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, const struct compat_iovec __user *, vec, compat_ulong_t, vlen) { return do_compat_writev(fd, vec, vlen, 0); } static long do_compat_pwritev64(unsigned long fd, |
378a10f3a
|
1204 |
const struct compat_iovec __user *vec, |
f17d8b354
|
1205 |
unsigned long vlen, loff_t pos, int flags) |
72ec35163
|
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 |
{ struct fd f; ssize_t ret; if (pos < 0) return -EINVAL; f = fdget(fd); if (!f.file) return -EBADF; ret = -ESPIPE; if (f.file->f_mode & FMODE_PWRITE) |
f17d8b354
|
1217 |
ret = compat_writev(f.file, vec, vlen, &pos, flags); |
72ec35163
|
1218 1219 1220 |
fdput(f); return ret; } |
378a10f3a
|
1221 1222 1223 1224 1225 |
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos) { |
f17d8b354
|
1226 |
return do_compat_pwritev64(fd, vec, vlen, pos, 0); |
378a10f3a
|
1227 1228 |
} #endif |
dfd948e32
|
1229 |
COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, |
72ec35163
|
1230 |
const struct compat_iovec __user *,vec, |
dfd948e32
|
1231 |
compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
72ec35163
|
1232 1233 |
{ loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
378a10f3a
|
1234 |
|
f17d8b354
|
1235 |
return do_compat_pwritev64(fd, vec, vlen, pos, 0); |
72ec35163
|
1236 |
} |
f17d8b354
|
1237 |
|
3ebfd81f7
|
1238 1239 1240 1241 1242 1243 1244 1245 |
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd, const struct compat_iovec __user *,vec, unsigned long, vlen, loff_t, pos, int, flags) { return do_compat_pwritev64(fd, vec, vlen, pos, flags); } #endif |
f17d8b354
|
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 |
COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd, const struct compat_iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, int, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) return do_compat_writev(fd, vec, vlen, flags); return do_compat_pwritev64(fd, vec, vlen, pos, flags); |
72ec35163
|
1256 |
} |
f17d8b354
|
1257 |
|
72ec35163
|
1258 |
#endif |
19f4fc3ae
|
1259 1260 |
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, loff_t max) |
1da177e4c
|
1261 |
{ |
2903ff019
|
1262 1263 |
struct fd in, out; struct inode *in_inode, *out_inode; |
1da177e4c
|
1264 |
loff_t pos; |
7995bd287
|
1265 |
loff_t out_pos; |
1da177e4c
|
1266 |
ssize_t retval; |
2903ff019
|
1267 |
int fl; |
1da177e4c
|
1268 1269 1270 1271 1272 |
/* * Get input file, and verify that it is ok.. */ retval = -EBADF; |
2903ff019
|
1273 1274 |
in = fdget(in_fd); if (!in.file) |
1da177e4c
|
1275 |
goto out; |
2903ff019
|
1276 |
if (!(in.file->f_mode & FMODE_READ)) |
1da177e4c
|
1277 |
goto fput_in; |
1da177e4c
|
1278 |
retval = -ESPIPE; |
7995bd287
|
1279 1280 1281 1282 |
if (!ppos) { pos = in.file->f_pos; } else { pos = *ppos; |
2903ff019
|
1283 |
if (!(in.file->f_mode & FMODE_PREAD)) |
1da177e4c
|
1284 |
goto fput_in; |
7995bd287
|
1285 1286 |
} retval = rw_verify_area(READ, in.file, &pos, count); |
e28cc7157
|
1287 |
if (retval < 0) |
1da177e4c
|
1288 |
goto fput_in; |
bc61384dc
|
1289 1290 |
if (count > MAX_RW_COUNT) count = MAX_RW_COUNT; |
1da177e4c
|
1291 |
|
1da177e4c
|
1292 1293 1294 1295 |
/* * Get output file, and verify that it is ok.. */ retval = -EBADF; |
2903ff019
|
1296 1297 |
out = fdget(out_fd); if (!out.file) |
1da177e4c
|
1298 |
goto fput_in; |
2903ff019
|
1299 |
if (!(out.file->f_mode & FMODE_WRITE)) |
1da177e4c
|
1300 1301 |
goto fput_out; retval = -EINVAL; |
496ad9aa8
|
1302 1303 |
in_inode = file_inode(in.file); out_inode = file_inode(out.file); |
7995bd287
|
1304 1305 |
out_pos = out.file->f_pos; retval = rw_verify_area(WRITE, out.file, &out_pos, count); |
e28cc7157
|
1306 |
if (retval < 0) |
1da177e4c
|
1307 |
goto fput_out; |
1da177e4c
|
1308 1309 |
if (!max) max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); |
1da177e4c
|
1310 1311 1312 1313 1314 1315 |
if (unlikely(pos + count > max)) { retval = -EOVERFLOW; if (pos >= max) goto fput_out; count = max - pos; } |
d96e6e716
|
1316 |
fl = 0; |
534f2aaa6
|
1317 |
#if 0 |
d96e6e716
|
1318 1319 1320 1321 1322 1323 |
/* * We need to debate whether we can enable this or not. The * man page documents EAGAIN return for the output at least, * and the application is arguably buggy if it doesn't expect * EAGAIN on a non-blocking file descriptor. */ |
2903ff019
|
1324 |
if (in.file->f_flags & O_NONBLOCK) |
d96e6e716
|
1325 |
fl = SPLICE_F_NONBLOCK; |
534f2aaa6
|
1326 |
#endif |
50cd2c577
|
1327 |
file_start_write(out.file); |
7995bd287
|
1328 |
retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); |
50cd2c577
|
1329 |
file_end_write(out.file); |
1da177e4c
|
1330 1331 |
if (retval > 0) { |
4b98d11b4
|
1332 1333 |
add_rchar(current, retval); add_wchar(current, retval); |
a68c2f12b
|
1334 1335 |
fsnotify_access(in.file); fsnotify_modify(out.file); |
7995bd287
|
1336 1337 1338 1339 1340 |
out.file->f_pos = out_pos; if (ppos) *ppos = pos; else in.file->f_pos = pos; |
1da177e4c
|
1341 |
} |
1da177e4c
|
1342 |
|
4b98d11b4
|
1343 1344 |
inc_syscr(current); inc_syscw(current); |
7995bd287
|
1345 |
if (pos > max) |
1da177e4c
|
1346 1347 1348 |
retval = -EOVERFLOW; fput_out: |
2903ff019
|
1349 |
fdput(out); |
1da177e4c
|
1350 |
fput_in: |
2903ff019
|
1351 |
fdput(in); |
1da177e4c
|
1352 1353 1354 |
out: return retval; } |
002c8976e
|
1355 |
SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
1da177e4c
|
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 |
{ loff_t pos; off_t off; ssize_t ret; if (offset) { if (unlikely(get_user(off, offset))) return -EFAULT; pos = off; ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } |
002c8976e
|
1373 |
SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
1da177e4c
|
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 |
{ loff_t pos; ssize_t ret; if (offset) { if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) return -EFAULT; ret = do_sendfile(out_fd, in_fd, &pos, count, 0); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } |
19f4fc3ae
|
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 |
#ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, compat_off_t __user *, offset, compat_size_t, count) { loff_t pos; off_t off; ssize_t ret; if (offset) { if (unlikely(get_user(off, offset))) return -EFAULT; pos = off; ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, compat_loff_t __user *, offset, compat_size_t, count) { loff_t pos; ssize_t ret; if (offset) { if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) return -EFAULT; ret = do_sendfile(out_fd, in_fd, &pos, count, 0); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } #endif |
29732938a
|
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 |
/* * copy_file_range() differs from regular file read and write in that it * specifically allows return partial success. When it does so is up to * the copy_file_range method. */ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len, unsigned int flags) { struct inode *inode_in = file_inode(file_in); struct inode *inode_out = file_inode(file_out); ssize_t ret; if (flags != 0) return -EINVAL; |
29732938a
|
1445 |
ret = rw_verify_area(READ, file_in, &pos_in, len); |
bc61384dc
|
1446 1447 1448 1449 1450 |
if (unlikely(ret)) return ret; ret = rw_verify_area(WRITE, file_out, &pos_out, len); if (unlikely(ret)) |
29732938a
|
1451 1452 1453 1454 |
return ret; if (!(file_in->f_mode & FMODE_READ) || !(file_out->f_mode & FMODE_WRITE) || |
eac70053a
|
1455 |
(file_out->f_flags & O_APPEND)) |
29732938a
|
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 |
return -EBADF; /* this could be relaxed once a method supports cross-fs copies */ if (inode_in->i_sb != inode_out->i_sb) return -EXDEV; if (len == 0) return 0; ret = mnt_want_write_file(file_out); if (ret) return ret; |
eac70053a
|
1468 1469 1470 1471 1472 1473 1474 |
ret = -EOPNOTSUPP; if (file_out->f_op->copy_file_range) ret = file_out->f_op->copy_file_range(file_in, pos_in, file_out, pos_out, len, flags); if (ret == -EOPNOTSUPP) ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out, len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0); |
29732938a
|
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 |
if (ret > 0) { fsnotify_access(file_in); add_rchar(current, ret); fsnotify_modify(file_out); add_wchar(current, ret); } inc_syscr(current); inc_syscw(current); mnt_drop_write_file(file_out); return ret; } EXPORT_SYMBOL(vfs_copy_file_range); SYSCALL_DEFINE6(copy_file_range, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, size_t, len, unsigned int, flags) { loff_t pos_in; loff_t pos_out; struct fd f_in; struct fd f_out; ssize_t ret = -EBADF; f_in = fdget(fd_in); if (!f_in.file) goto out2; f_out = fdget(fd_out); if (!f_out.file) goto out1; ret = -EFAULT; if (off_in) { if (copy_from_user(&pos_in, off_in, sizeof(loff_t))) goto out; } else { pos_in = f_in.file->f_pos; } if (off_out) { if (copy_from_user(&pos_out, off_out, sizeof(loff_t))) goto out; } else { pos_out = f_out.file->f_pos; } ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len, flags); if (ret > 0) { pos_in += ret; pos_out += ret; if (off_in) { if (copy_to_user(off_in, &pos_in, sizeof(loff_t))) ret = -EFAULT; } else { f_in.file->f_pos = pos_in; } if (off_out) { if (copy_to_user(off_out, &pos_out, sizeof(loff_t))) ret = -EFAULT; } else { f_out.file->f_pos = pos_out; } } out: fdput(f_out); out1: fdput(f_in); out2: return ret; } |
04b38d601
|
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 |
static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write) { struct inode *inode = file_inode(file); if (unlikely(pos < 0)) return -EINVAL; if (unlikely((loff_t) (pos + len) < 0)) return -EINVAL; if (unlikely(inode->i_flctx && mandatory_lock(inode))) { loff_t end = len ? pos + len - 1 : OFFSET_MAX; int retval; retval = locks_mandatory_area(inode, file, pos, end, write ? F_WRLCK : F_RDLCK); if (retval < 0) return retval; } return security_file_permission(file, write ? MAY_WRITE : MAY_READ); } int vfs_clone_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, u64 len) { struct inode *inode_in = file_inode(file_in); struct inode *inode_out = file_inode(file_out); int ret; if (inode_in->i_sb != inode_out->i_sb || file_in->f_path.mnt != file_out->f_path.mnt) return -EXDEV; if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) return -EISDIR; if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) |
d79bdd52d
|
1589 |
return -EINVAL; |
04b38d601
|
1590 1591 1592 |
if (!(file_in->f_mode & FMODE_READ) || !(file_out->f_mode & FMODE_WRITE) || |
0fcbf996d
|
1593 |
(file_out->f_flags & O_APPEND)) |
04b38d601
|
1594 |
return -EBADF; |
0fcbf996d
|
1595 1596 |
if (!file_in->f_op->clone_file_range) return -EOPNOTSUPP; |
04b38d601
|
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 |
ret = clone_verify_area(file_in, pos_in, len, false); if (ret) return ret; ret = clone_verify_area(file_out, pos_out, len, true); if (ret) return ret; if (pos_in + len > i_size_read(inode_in)) return -EINVAL; ret = mnt_want_write_file(file_out); if (ret) return ret; ret = file_in->f_op->clone_file_range(file_in, pos_in, file_out, pos_out, len); if (!ret) { fsnotify_access(file_in); fsnotify_modify(file_out); } mnt_drop_write_file(file_out); return ret; } EXPORT_SYMBOL(vfs_clone_file_range); |
54dbc1517
|
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 |
int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same) { struct file_dedupe_range_info *info; struct inode *src = file_inode(file); u64 off; u64 len; int i; int ret; bool is_admin = capable(CAP_SYS_ADMIN); u16 count = same->dest_count; struct file *dst_file; loff_t dst_off; ssize_t deduped; if (!(file->f_mode & FMODE_READ)) return -EINVAL; if (same->reserved1 || same->reserved2) return -EINVAL; off = same->src_offset; len = same->src_length; ret = -EISDIR; if (S_ISDIR(src->i_mode)) goto out; ret = -EINVAL; if (!S_ISREG(src->i_mode)) goto out; ret = clone_verify_area(file, off, len, false); if (ret < 0) goto out; ret = 0; /* pre-format output fields to sane values */ for (i = 0; i < count; i++) { same->info[i].bytes_deduped = 0ULL; same->info[i].status = FILE_DEDUPE_RANGE_SAME; } for (i = 0, info = same->info; i < count; i++, info++) { struct inode *dst; struct fd dst_fd = fdget(info->dest_fd); dst_file = dst_fd.file; if (!dst_file) { info->status = -EBADF; goto next_loop; } dst = file_inode(dst_file); ret = mnt_want_write_file(dst_file); if (ret) { info->status = ret; goto next_loop; } dst_off = info->dest_offset; ret = clone_verify_area(dst_file, dst_off, len, true); if (ret < 0) { info->status = ret; goto next_file; } ret = 0; if (info->reserved) { info->status = -EINVAL; } else if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { info->status = -EINVAL; } else if (file->f_path.mnt != dst_file->f_path.mnt) { info->status = -EXDEV; } else if (S_ISDIR(dst->i_mode)) { info->status = -EISDIR; } else if (dst_file->f_op->dedupe_file_range == NULL) { info->status = -EINVAL; } else { deduped = dst_file->f_op->dedupe_file_range(file, off, len, dst_file, info->dest_offset); if (deduped == -EBADE) info->status = FILE_DEDUPE_RANGE_DIFFERS; else if (deduped < 0) info->status = deduped; else info->bytes_deduped += deduped; } next_file: mnt_drop_write_file(dst_file); next_loop: fdput(dst_fd); |
e62e560fc
|
1717 1718 1719 |
if (fatal_signal_pending(current)) goto out; |
54dbc1517
|
1720 1721 1722 1723 1724 1725 |
} out: return ret; } EXPORT_SYMBOL(vfs_dedupe_file_range); |