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Commit b833a366 authored by Amir Goldstein's avatar Amir Goldstein Committed by Miklos Szeredi
Browse files

ovl: add ovl_fadvise() 



Implement stacked fadvise to fix syscalls readahead(2) and fadvise64(2)
on an overlayfs file.

Suggested-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
Fixes: d1d04ef8 ("ovl: stack file ops")
Signed-off-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 3d8f7615

fs/overlayfs/file.c

+20 −0
Original line number Diff line number Diff line
@@ -331,6 +331,25 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len 
	return ret;

}



static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice)

{

	struct fd real;

	const struct cred *old_cred;

	int ret;



	ret = ovl_real_fdget(file, &real);

	if (ret)

		return ret;



	old_cred = ovl_override_creds(file_inode(file)->i_sb);

	ret = vfs_fadvise(real.file, offset, len, advice);

	revert_creds(old_cred);



	fdput(real);



	return ret;

}



static long ovl_real_ioctl(struct file *file, unsigned int cmd,

			   unsigned long arg)

{
@@ -499,6 +518,7 @@ const struct file_operations ovl_file_operations = { 
	.fsync		= ovl_fsync,

	.mmap		= ovl_mmap,

	.fallocate	= ovl_fallocate,

	.fadvise	= ovl_fadvise,

	.unlocked_ioctl	= ovl_ioctl,

	.compat_ioctl	= ovl_compat_ioctl,