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authorChristoph Hellwig <hch@lst.de>2020-05-08 10:00:28 +0300
committerChristoph Hellwig <hch@lst.de>2020-07-08 09:27:57 +0300
commit6209dd9132e8ea5545cffc84483841e88ea8cc5b (patch)
tree5b9b51d6d71f383638e0a3ffb25911b24367f639 /fs
parenta1f9b1c0439db47ea10418b8ee7092a0d970cc2d (diff)
downloadlinux-6209dd9132e8ea5545cffc84483841e88ea8cc5b.tar.xz
fs: implement kernel_read using __kernel_read
Consolidate the two in-kernel read helpers to make upcoming changes easier. The only difference are the missing call to rw_verify_area in kernel_read, and an access_ok check that doesn't make sense for kernel buffers to start with. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/read_write.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 21c9d90a257e..42a027719324 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -455,15 +455,12 @@ ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
{
- mm_segment_t old_fs;
- ssize_t result;
+ ssize_t ret;
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- /* The cast to a user pointer is valid due to the set_fs() */
- result = vfs_read(file, (void __user *)buf, count, pos);
- set_fs(old_fs);
- return result;
+ ret = rw_verify_area(READ, file, pos, count);
+ if (ret)
+ return ret;
+ return __kernel_read(file, buf, count, pos);
}
EXPORT_SYMBOL(kernel_read);