On Wed, Apr 27, 2011 at 08:13:47PM +0200, Andrea Righi wrote: > @@ -127,6 +128,12 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, > loff_t len, int advice) > invalidate_mapping_pages(mapping, start_index, > end_index); > break; > + case POSIX_FADV_DONTNEED_FS: > + if (capable(CAP_SYS_ADMIN)) > + drop_pagecache_sb(file->f_dentry->d_sb, NULL); > + else > + ret = -EPERM; > + break; > default: > ret = -EINVAL; > }
Mmm ... what if I open /dev/sdxyz and call fadvise() on it? I think you end up flushing /dev's page cache entries, instead of the filesystem which is on /dev/sdxyz. If I understand correctly, you want mapping->host->i_sb instead of file->f_dentry->d_sb. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
