diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/read_write.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/read_write.c | 1008 |
1 files changed, 0 insertions, 1008 deletions
diff --git a/ANDROID_3.4.5/fs/read_write.c b/ANDROID_3.4.5/fs/read_write.c deleted file mode 100644 index ffc99d22..00000000 --- a/ANDROID_3.4.5/fs/read_write.c +++ /dev/null @@ -1,1008 +0,0 @@ -/* - * 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> -#include <linux/fsnotify.h> -#include <linux/security.h> -#include <linux/export.h> -#include <linux/syscalls.h> -#include <linux/pagemap.h> -#include <linux/splice.h> -#include "read_write.h" - -#include <asm/uaccess.h> -#include <asm/unistd.h> - -const struct file_operations generic_ro_fops = { - .llseek = generic_file_llseek, - .read = do_sync_read, - .aio_read = generic_file_aio_read, - .mmap = generic_file_readonly_mmap, - .splice_read = generic_file_splice_read, -}; - -EXPORT_SYMBOL(generic_ro_fops); - -static inline int unsigned_offsets(struct file *file) -{ - return file->f_mode & FMODE_UNSIGNED_OFFSET; -} - -static loff_t lseek_execute(struct file *file, struct inode *inode, - loff_t offset, loff_t maxsize) -{ - 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; -} - -/** - * generic_file_llseek_size - generic llseek implementation for regular files - * @file: file structure to seek on - * @offset: file offset to seek to - * @origin: type of seek - * @size: max size of file system - * - * This is a variant of generic_file_llseek that allows passing in a custom - * file size. - * - * Synchronization: - * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) - * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. - * read/writes behave like SEEK_SET against seeks. - */ -loff_t -generic_file_llseek_size(struct file *file, loff_t offset, int origin, - loff_t maxsize) -{ - struct inode *inode = file->f_mapping->host; - - switch (origin) { - case SEEK_END: - offset += i_size_read(inode); - break; - case SEEK_CUR: - /* - * 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; - /* - * 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); - offset = lseek_execute(file, inode, file->f_pos + offset, - maxsize); - spin_unlock(&file->f_lock); - return offset; - 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. - */ - if (offset >= i_size_read(inode)) - 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. - */ - if (offset >= i_size_read(inode)) - return -ENXIO; - offset = i_size_read(inode); - break; - } - - return lseek_execute(file, inode, offset, maxsize); -} -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 - * @origin: type of seek - * - * This is a generic implemenation of ->llseek useable for all normal local - * filesystems. It just updates the file offset to the value specified by - * @offset and @origin under i_mutex. - */ -loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) -{ - struct inode *inode = file->f_mapping->host; - - return generic_file_llseek_size(file, offset, origin, - inode->i_sb->s_maxbytes); -} -EXPORT_SYMBOL(generic_file_llseek); - -/** - * noop_llseek - No Operation Performed llseek implementation - * @file: file structure to seek on - * @offset: file offset to seek to - * @origin: type of seek - * - * 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. - */ -loff_t noop_llseek(struct file *file, loff_t offset, int origin) -{ - return file->f_pos; -} -EXPORT_SYMBOL(noop_llseek); - -loff_t no_llseek(struct file *file, loff_t offset, int origin) -{ - return -ESPIPE; -} -EXPORT_SYMBOL(no_llseek); - -loff_t default_llseek(struct file *file, loff_t offset, int origin) -{ - struct inode *inode = file->f_path.dentry->d_inode; - loff_t retval; - - mutex_lock(&inode->i_mutex); - switch (origin) { - case SEEK_END: - offset += i_size_read(inode); - break; - case SEEK_CUR: - if (offset == 0) { - retval = file->f_pos; - goto out; - } - offset += file->f_pos; - 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. - */ - if (offset >= inode->i_size) { - retval = -ENXIO; - goto out; - } - 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. - */ - if (offset >= inode->i_size) { - retval = -ENXIO; - goto out; - } - offset = inode->i_size; - break; - } - retval = -EINVAL; - if (offset >= 0 || unsigned_offsets(file)) { - if (offset != file->f_pos) { - file->f_pos = offset; - file->f_version = 0; - } - retval = offset; - } -out: - mutex_unlock(&inode->i_mutex); - return retval; -} -EXPORT_SYMBOL(default_llseek); - -loff_t vfs_llseek(struct file *file, loff_t offset, int origin) -{ - loff_t (*fn)(struct file *, loff_t, int); - - fn = no_llseek; - if (file->f_mode & FMODE_LSEEK) { - if (file->f_op && file->f_op->llseek) - fn = file->f_op->llseek; - } - return fn(file, offset, origin); -} -EXPORT_SYMBOL(vfs_llseek); - -SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, origin) -{ - off_t retval; - struct file * file; - int fput_needed; - - retval = -EBADF; - file = fget_light(fd, &fput_needed); - if (!file) - goto bad; - - retval = -EINVAL; - if (origin <= SEEK_MAX) { - loff_t res = vfs_llseek(file, offset, origin); - retval = res; - if (res != (loff_t)retval) - retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ - } - fput_light(file, fput_needed); -bad: - return retval; -} - -#ifdef __ARCH_WANT_SYS_LLSEEK -SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, - unsigned long, offset_low, loff_t __user *, result, - unsigned int, origin) -{ - int retval; - struct file * file; - loff_t offset; - int fput_needed; - - retval = -EBADF; - file = fget_light(fd, &fput_needed); - if (!file) - goto bad; - - retval = -EINVAL; - if (origin > SEEK_MAX) - goto out_putf; - - offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low, - origin); - - retval = (int)offset; - if (offset >= 0) { - retval = -EFAULT; - if (!copy_to_user(result, &offset, sizeof(offset))) - retval = 0; - } -out_putf: - fput_light(file, fput_needed); -bad: - return retval; -} -#endif - - -/* - * rw_verify_area doesn't like huge counts. We limit - * them to something that fits in "int" so that others - * won't have to do range checks all the time. - */ -int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count) -{ - struct inode *inode; - loff_t pos; - int retval = -EINVAL; - - inode = file->f_path.dentry->d_inode; - if (unlikely((ssize_t) count < 0)) - return retval; - pos = *ppos; - 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)) - return retval; - } - - if (unlikely(inode->i_flock && mandatory_lock(inode))) { - retval = locks_mandatory_area( - read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, - inode, file, pos, count); - if (retval < 0) - return retval; - } - retval = security_file_permission(file, - read_write == READ ? MAY_READ : MAY_WRITE); - if (retval) - return retval; - return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; -} - -static void wait_on_retry_sync_kiocb(struct kiocb *iocb) -{ - set_current_state(TASK_UNINTERRUPTIBLE); - if (!kiocbIsKicked(iocb)) - schedule(); - else - kiocbClearKicked(iocb); - __set_current_state(TASK_RUNNING); -} - -ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) -{ - struct iovec iov = { .iov_base = buf, .iov_len = len }; - struct kiocb kiocb; - ssize_t ret; - - init_sync_kiocb(&kiocb, filp); - kiocb.ki_pos = *ppos; - kiocb.ki_left = len; - kiocb.ki_nbytes = len; - - for (;;) { - ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); - if (ret != -EIOCBRETRY) - break; - wait_on_retry_sync_kiocb(&kiocb); - } - - if (-EIOCBQUEUED == ret) - ret = wait_on_sync_kiocb(&kiocb); - *ppos = kiocb.ki_pos; - return ret; -} - -EXPORT_SYMBOL(do_sync_read); - -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; - if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read)) - return -EINVAL; - if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) - return -EFAULT; - - ret = rw_verify_area(READ, file, pos, count); - if (ret >= 0) { - count = ret; - if (file->f_op->read) - ret = file->f_op->read(file, buf, count, pos); - else - ret = do_sync_read(file, buf, count, pos); - if (ret > 0) { - fsnotify_access(file); - add_rchar(current, ret); - } - inc_syscr(current); - } - - return ret; -} - -EXPORT_SYMBOL(vfs_read); - -ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) -{ - struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; - struct kiocb kiocb; - ssize_t ret; - - init_sync_kiocb(&kiocb, filp); - kiocb.ki_pos = *ppos; - kiocb.ki_left = len; - kiocb.ki_nbytes = len; - - for (;;) { - ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); - if (ret != -EIOCBRETRY) - break; - wait_on_retry_sync_kiocb(&kiocb); - } - - if (-EIOCBQUEUED == ret) - ret = wait_on_sync_kiocb(&kiocb); - *ppos = kiocb.ki_pos; - return ret; -} - -EXPORT_SYMBOL(do_sync_write); - -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; - if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write)) - return -EINVAL; - if (unlikely(!access_ok(VERIFY_READ, buf, count))) - return -EFAULT; - - ret = rw_verify_area(WRITE, file, pos, count); - if (ret >= 0) { - count = ret; - if (file->f_op->write) - ret = file->f_op->write(file, buf, count, pos); - else - ret = do_sync_write(file, buf, count, pos); - if (ret > 0) { - fsnotify_modify(file); - add_wchar(current, ret); - } - inc_syscw(current); - } - - 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; -} - -SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - file = fget_light(fd, &fput_needed); - if (file) { - loff_t pos = file_pos_read(file); - ret = vfs_read(file, buf, count, &pos); - file_pos_write(file, pos); - fput_light(file, fput_needed); - } - - return ret; -} - -SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, - size_t, count) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - file = fget_light(fd, &fput_needed); - if (file) { - loff_t pos = file_pos_read(file); - ret = vfs_write(file, buf, count, &pos); - file_pos_write(file, pos); - fput_light(file, fput_needed); - } - - return ret; -} - -SYSCALL_DEFINE(pread64)(unsigned int fd, char __user *buf, - size_t count, loff_t pos) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - if (pos < 0) - return -EINVAL; - - file = fget_light(fd, &fput_needed); - if (file) { - ret = -ESPIPE; - if (file->f_mode & FMODE_PREAD) - ret = vfs_read(file, buf, count, &pos); - fput_light(file, fput_needed); - } - - return ret; -} -#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS -asmlinkage long SyS_pread64(long fd, long buf, long count, loff_t pos) -{ - return SYSC_pread64((unsigned int) fd, (char __user *) buf, - (size_t) count, pos); -} -SYSCALL_ALIAS(sys_pread64, SyS_pread64); -#endif - -SYSCALL_DEFINE(pwrite64)(unsigned int fd, const char __user *buf, - size_t count, loff_t pos) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - if (pos < 0) - return -EINVAL; - - file = fget_light(fd, &fput_needed); - if (file) { - ret = -ESPIPE; - if (file->f_mode & FMODE_PWRITE) - ret = vfs_write(file, buf, count, &pos); - fput_light(file, fput_needed); - } - - return ret; -} -#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS -asmlinkage long SyS_pwrite64(long fd, long buf, long count, loff_t pos) -{ - return SYSC_pwrite64((unsigned int) fd, (const char __user *) buf, - (size_t) count, pos); -} -SYSCALL_ALIAS(sys_pwrite64, SyS_pwrite64); -#endif - -/* - * 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; -} -EXPORT_SYMBOL(iov_shorten); - -ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, - unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) -{ - struct kiocb kiocb; - ssize_t ret; - - init_sync_kiocb(&kiocb, filp); - kiocb.ki_pos = *ppos; - kiocb.ki_left = len; - kiocb.ki_nbytes = len; - - for (;;) { - ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); - if (ret != -EIOCBRETRY) - break; - wait_on_retry_sync_kiocb(&kiocb); - } - - if (ret == -EIOCBQUEUED) - ret = wait_on_sync_kiocb(&kiocb); - *ppos = kiocb.ki_pos; - return ret; -} - -/* Do it by hand, with file-ops */ -ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, - unsigned long nr_segs, loff_t *ppos, io_fn_t fn) -{ - struct iovec *vector = iov; - ssize_t ret = 0; - - while (nr_segs > 0) { - void __user *base; - size_t len; - ssize_t nr; - - base = vector->iov_base; - len = vector->iov_len; - vector++; - nr_segs--; - - nr = fn(filp, base, len, ppos); - - if (nr < 0) { - if (!ret) - ret = nr; - break; - } - ret += nr; - if (nr != len) - break; - } - - return ret; -} - -/* A write operation does a read from user space and vice versa */ -#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) - -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, - struct iovec **ret_pointer, - int check_access) -{ - unsigned long seg; - ssize_t ret; - struct iovec *iov = fast_pointer; - - /* - * 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... - */ - if (nr_segs == 0) { - ret = 0; - goto out; - } - - /* - * First get the "struct iovec" from user memory and - * verify all the pointers - */ - if (nr_segs > UIO_MAXIOV) { - ret = -EINVAL; - goto out; - } - if (nr_segs > fast_segs) { - iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) { - ret = -ENOMEM; - goto out; - } - } - if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { - ret = -EFAULT; - goto out; - } - - /* - * 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. - * - * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the - * overflow case. - */ - ret = 0; - for (seg = 0; seg < nr_segs; seg++) { - void __user *buf = iov[seg].iov_base; - ssize_t len = (ssize_t)iov[seg].iov_len; - - /* see if we we're about to use an invalid len or if - * it's about to overflow ssize_t */ - if (len < 0) { - ret = -EINVAL; - goto out; - } - if (check_access - && unlikely(!access_ok(vrfy_dir(type), buf, len))) { - ret = -EFAULT; - goto out; - } - if (len > MAX_RW_COUNT - ret) { - len = MAX_RW_COUNT - ret; - iov[seg].iov_len = len; - } - ret += len; - } -out: - *ret_pointer = iov; - return ret; -} - -static ssize_t do_readv_writev(int type, struct file *file, - const struct iovec __user * uvector, - unsigned long nr_segs, loff_t *pos) -{ - size_t tot_len; - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - ssize_t ret; - io_fn_t fn; - iov_fn_t fnv; - - if (!file->f_op) { - ret = -EINVAL; - goto out; - } - - ret = rw_copy_check_uvector(type, uvector, nr_segs, - ARRAY_SIZE(iovstack), iovstack, &iov, 1); - if (ret <= 0) - goto out; - - tot_len = ret; - ret = rw_verify_area(type, file, pos, tot_len); - if (ret < 0) - goto out; - - fnv = NULL; - if (type == READ) { - fn = file->f_op->read; - fnv = file->f_op->aio_read; - } else { - fn = (io_fn_t)file->f_op->write; - fnv = file->f_op->aio_write; - } - - if (fnv) - ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, - pos, fnv); - else - ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); - -out: - if (iov != iovstack) - kfree(iov); - if ((ret + (type == READ)) > 0) { - if (type == READ) - fsnotify_access(file); - else - fsnotify_modify(file); - } - return ret; -} - -ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, - unsigned long vlen, loff_t *pos) -{ - if (!(file->f_mode & FMODE_READ)) - return -EBADF; - if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) - return -EINVAL; - - return do_readv_writev(READ, file, vec, vlen, pos); -} - -EXPORT_SYMBOL(vfs_readv); - -ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, - unsigned long vlen, loff_t *pos) -{ - if (!(file->f_mode & FMODE_WRITE)) - return -EBADF; - if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) - return -EINVAL; - - return do_readv_writev(WRITE, file, vec, vlen, pos); -} - -EXPORT_SYMBOL(vfs_writev); - -SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - file = fget_light(fd, &fput_needed); - if (file) { - loff_t pos = file_pos_read(file); - ret = vfs_readv(file, vec, vlen, &pos); - file_pos_write(file, pos); - fput_light(file, fput_needed); - } - - if (ret > 0) - add_rchar(current, ret); - inc_syscr(current); - return ret; -} - -SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, - unsigned long, vlen) -{ - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - file = fget_light(fd, &fput_needed); - if (file) { - loff_t pos = file_pos_read(file); - ret = vfs_writev(file, vec, vlen, &pos); - file_pos_write(file, pos); - fput_light(file, fput_needed); - } - - if (ret > 0) - add_wchar(current, ret); - inc_syscw(current); - return ret; -} - -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; -} - -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); - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - if (pos < 0) - return -EINVAL; - - file = fget_light(fd, &fput_needed); - if (file) { - ret = -ESPIPE; - if (file->f_mode & FMODE_PREAD) - ret = vfs_readv(file, vec, vlen, &pos); - fput_light(file, fput_needed); - } - - if (ret > 0) - add_rchar(current, ret); - inc_syscr(current); - return ret; -} - -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); - struct file *file; - ssize_t ret = -EBADF; - int fput_needed; - - if (pos < 0) - return -EINVAL; - - file = fget_light(fd, &fput_needed); - if (file) { - ret = -ESPIPE; - if (file->f_mode & FMODE_PWRITE) - ret = vfs_writev(file, vec, vlen, &pos); - fput_light(file, fput_needed); - } - - if (ret > 0) - add_wchar(current, ret); - inc_syscw(current); - return ret; -} - -static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, - size_t count, loff_t max) -{ - struct file * in_file, * out_file; - struct inode * in_inode, * out_inode; - loff_t pos; - ssize_t retval; - int fput_needed_in, fput_needed_out, fl; - - /* - * Get input file, and verify that it is ok.. - */ - retval = -EBADF; - in_file = fget_light(in_fd, &fput_needed_in); - if (!in_file) - goto out; - if (!(in_file->f_mode & FMODE_READ)) - goto fput_in; - retval = -ESPIPE; - if (!ppos) - ppos = &in_file->f_pos; - else - if (!(in_file->f_mode & FMODE_PREAD)) - goto fput_in; - retval = rw_verify_area(READ, in_file, ppos, count); - if (retval < 0) - goto fput_in; - count = retval; - - /* - * Get output file, and verify that it is ok.. - */ - retval = -EBADF; - out_file = fget_light(out_fd, &fput_needed_out); - if (!out_file) - goto fput_in; - if (!(out_file->f_mode & FMODE_WRITE)) - goto fput_out; - retval = -EINVAL; - in_inode = in_file->f_path.dentry->d_inode; - out_inode = out_file->f_path.dentry->d_inode; - retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count); - if (retval < 0) - goto fput_out; - count = retval; - - if (!max) - max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); - - pos = *ppos; - if (unlikely(pos + count > max)) { - retval = -EOVERFLOW; - if (pos >= max) - goto fput_out; - count = max - pos; - } - - fl = 0; -#if 0 - /* - * 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. - */ - if (in_file->f_flags & O_NONBLOCK) - fl = SPLICE_F_NONBLOCK; -#endif - retval = do_splice_direct(in_file, ppos, out_file, count, fl); - - if (retval > 0) { - add_rchar(current, retval); - add_wchar(current, retval); - } - - inc_syscr(current); - inc_syscw(current); - if (*ppos > max) - retval = -EOVERFLOW; - -fput_out: - fput_light(out_file, fput_needed_out); -fput_in: - fput_light(in_file, fput_needed_in); -out: - return retval; -} - -SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, 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); -} - -SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, 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); -} |