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fs: move more code into do_iter_read/do_iter_write 

The checks for the permissions and can read / write flags are common
for the callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2017-05-27 11:16:49 +03:00 committed by Al Viro
parent 19c735868d
commit edab5fe38c
1 changed files with 28 additions and 45 deletions
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73
fs/read_write.c
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@ -922,6 +922,11 @@ static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
size_t tot_len;
ssize_t ret = 0;
if (!(file->f_mode & FMODE_READ))
return -EBADF;
if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
tot_len = iov_iter_count(iter);
if (!tot_len)
goto out;
@ -945,6 +950,11 @@ static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,
size_t tot_len;
ssize_t ret = 0;
if (!(file->f_mode & FMODE_WRITE))
return -EBADF;
if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
tot_len = iov_iter_count(iter);
if (!tot_len)
return 0;
@ -971,17 +981,12 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
struct iov_iter iter;
ssize_t ret;
if (!(file->f_mode & FMODE_READ))
return -EBADF;
if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
if (ret < 0)
return ret;
if (ret >= 0) {
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
}
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
return ret;
}
EXPORT_SYMBOL(vfs_readv);
@ -994,17 +999,11 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
struct iov_iter iter;
ssize_t ret;
if (!(file->f_mode & FMODE_WRITE))
return -EBADF;
if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
ret = import_iovec(WRITE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
if (ret < 0)
return ret;
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
if (ret >= 0) {
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
}
return ret;
}
EXPORT_SYMBOL(vfs_writev);
@ -1161,21 +1160,13 @@ static size_t compat_readv(struct file *file,
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
ssize_t ret = -EBADF;
if (!(file->f_mode & FMODE_READ))
goto out;
ret = -EINVAL;
if (!(file->f_mode & FMODE_CAN_READ))
goto out;
ssize_t ret;
ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);
if (ret < 0)
goto out;
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
out:
if (ret >= 0) {
ret = do_iter_read(file, &iter, pos, flags);
kfree(iov);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
@ -1274,21 +1265,13 @@ static size_t compat_writev(struct file *file,
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
ssize_t ret = -EBADF;
if (!(file->f_mode & FMODE_WRITE))
goto out;
ret = -EINVAL;
if (!(file->f_mode & FMODE_CAN_WRITE))
goto out;
ssize_t ret;
ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
if (ret < 0)
goto out;
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
out:
if (ret >= 0) {
ret = do_iter_write(file, &iter, pos, flags);
kfree(iov);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);