Commit 5d86cc8b authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] tmpfs 4/6: use mark_page_accessed

From: Hugh Dickins <hugh@veritas.com>

tmpfs pages should be surfing the LRUs in the company of their filemap
friends: I was expecting the rules to change, but they've been stable so
long, let's sprinkle mark_page_accessed in the equivalent places here; but
(don't ask me why) SetPageReferenced in shmem_file_write.  Ooh, and
shmem_populate was missing a flush_page_to_ram.
parent f56453c9
......@@ -951,6 +951,7 @@ struct page *shmem_nopage(struct vm_area_struct *vma, unsigned long address, int
if (error)
return (error == -ENOMEM)? NOPAGE_OOM: NOPAGE_SIGBUS;
mark_page_accessed(page);
flush_page_to_ram(page);
return page;
}
......@@ -978,6 +979,8 @@ static int shmem_populate(struct vm_area_struct *vma,
if (err)
return err;
if (page) {
mark_page_accessed(page);
flush_page_to_ram(page);
err = install_page(mm, vma, addr, page, prot);
if (err) {
page_cache_release(page);
......@@ -1192,6 +1195,8 @@ shmem_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
break;
}
if (!PageReferenced(page))
SetPageReferenced(page);
set_page_dirty(page);
page_cache_release(page);
......@@ -1264,13 +1269,20 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
}
nr -= offset;
/* If users can be writing to this page using arbitrary
if (page != ZERO_PAGE(0)) {
/*
* If users can be writing to this page using arbitrary
* virtual addresses, take care about potential aliasing
* before reading the page on the kernel side.
*/
if (!list_empty(&mapping->i_mmap_shared) &&
page != ZERO_PAGE(0))
if (!list_empty(&mapping->i_mmap_shared))
flush_dcache_page(page);
/*
* Mark the page accessed if we read the beginning.
*/
if (!offset)
mark_page_accessed(page);
}
/*
* Ok, we have the page, and it's up-to-date, so
......@@ -1523,6 +1535,7 @@ static int shmem_readlink(struct dentry *dentry, char *buffer, int buflen)
return res;
res = vfs_readlink(dentry, buffer, buflen, kmap(page));
kunmap(page);
mark_page_accessed(page);
page_cache_release(page);
return res;
}
......@@ -1535,6 +1548,7 @@ static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
return res;
res = vfs_follow_link(nd, kmap(page));
kunmap(page);
mark_page_accessed(page);
page_cache_release(page);
return res;
}
......
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