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authorChristoph Hellwig <hch@lst.de>2017-05-27 11:16:49 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-06-30 00:49:22 +0300
commitedab5fe38c2c17a7d7ea5f82e1d9503bfc79a8ac (patch)
tree1de02e2d99dd9023809b778a81774595dddacf2d /fs/read_write.c
parent19c735868dd018fd432d0df43aaf2d5ecb7c1256 (diff)
downloadlinux-edab5fe38c2c17a7d7ea5f82e1d9503bfc79a8ac.tar.xz
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>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c73
1 files changed, 28 insertions, 45 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index f453c9a485b9..64b61a032a56 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -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);