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authorJiufei Xue <jiufei.xue@linux.alibaba.com>2019-11-20 17:45:25 +0800
committerMiklos Szeredi <mszeredi@redhat.com>2020-01-24 09:46:46 +0100
commit5dcdc43e24a1810d3c3f4959af3d0c8e0026d863 (patch)
tree3bc92094e47dcdbc4cca8fd30465b4a191135d73 /fs/read_write.c
parentovl: layer is const (diff)
downloadlinux-dev-5dcdc43e24a1810d3c3f4959af3d0c8e0026d863.tar.xz
linux-dev-5dcdc43e24a1810d3c3f4959af3d0c8e0026d863.zip
vfs: add vfs_iocb_iter_[read|write] helper functions
This doesn't cause any behavior changes and will be used by overlay async IO implementation. Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 5bbf587f5bc1..bc75493e747b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -939,6 +939,34 @@ out:
return ret;
}
+ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
+ struct iov_iter *iter)
+{
+ size_t tot_len;
+ ssize_t ret = 0;
+
+ if (!file->f_op->read_iter)
+ return -EINVAL;
+ 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;
+ ret = rw_verify_area(READ, file, &iocb->ki_pos, tot_len);
+ if (ret < 0)
+ return ret;
+
+ ret = call_read_iter(file, iocb, iter);
+out:
+ if (ret >= 0)
+ fsnotify_access(file);
+ return ret;
+}
+EXPORT_SYMBOL(vfs_iocb_iter_read);
+
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
rwf_t flags)
{
@@ -975,6 +1003,34 @@ static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,
return ret;
}
+ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
+ struct iov_iter *iter)
+{
+ size_t tot_len;
+ ssize_t ret = 0;
+
+ if (!file->f_op->write_iter)
+ return -EINVAL;
+ 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;
+ ret = rw_verify_area(WRITE, file, &iocb->ki_pos, tot_len);
+ if (ret < 0)
+ return ret;
+
+ ret = call_write_iter(file, iocb, iter);
+ if (ret > 0)
+ fsnotify_modify(file);
+
+ return ret;
+}
+EXPORT_SYMBOL(vfs_iocb_iter_write);
+
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
rwf_t flags)
{