Patch "vfs: fix readahead(2) on block devices" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    vfs: fix readahead(2) on block devices

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vfs-fix-readahead-2-on-block-devices.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c85bc8729b40937684a17b195caf139c35c00129
Author: Reuben Hawkins <reubenhwk@xxxxxxxxx>
Date:   Mon Oct 2 20:57:04 2023 -0500

    vfs: fix readahead(2) on block devices
    
    [ Upstream commit 7116c0af4b8414b2f19fdb366eea213cbd9d91c2 ]
    
    Readahead was factored to call generic_fadvise.  That refactor added an
    S_ISREG restriction which broke readahead on block devices.
    
    In addition to S_ISREG, this change checks S_ISBLK to fix block device
    readahead.  There is no change in behavior with any file type besides block
    devices in this change.
    
    Fixes: 3d8f7615319b ("vfs: implement readahead(2) using POSIX_FADV_WILLNEED")
    Signed-off-by: Reuben Hawkins <reubenhwk@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20231003015704.2415-1-reubenhwk@xxxxxxxxx
    Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
    Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/mm/readahead.c b/mm/readahead.c
index b10f0cf81d804..ba43428043a35 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -749,7 +749,8 @@ ssize_t ksys_readahead(int fd, loff_t offset, size_t count)
 	 */
 	ret = -EINVAL;
 	if (!f.file->f_mapping || !f.file->f_mapping->a_ops ||
-	    !S_ISREG(file_inode(f.file)->i_mode))
+	    (!S_ISREG(file_inode(f.file)->i_mode) &&
+	    !S_ISBLK(file_inode(f.file)->i_mode)))
 		goto out;
 
 	ret = vfs_fadvise(f.file, offset, count, POSIX_FADV_WILLNEED);



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