#include <linux/ceph/ceph_debug.h>

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/namei.h>
#include <linux/writeback.h>

#include <linux/ceph/libceph.h>

/*
 * build a vector of user pages
 */
struct page **ceph_get_direct_page_vector(const void __user *data,
					  int num_pages, bool write_page)
{
	struct page **pages;
	int got = 0;
	int rc = 0;

	pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS);
	if (!pages)
		return ERR_PTR(-ENOMEM);

	while (got < num_pages) {
		rc = get_user_pages_unlocked(
		    (unsigned long)data + ((unsigned long)got * PAGE_SIZE),
		    num_pages - got, pages + got, write_page ? FOLL_WRITE : 0);
		if (rc < 0)
			break;
		BUG_ON(rc == 0);
		got += rc;
	}
	if (rc < 0)
		goto fail;
	return pages;

fail:
	ceph_put_page_vector(pages, got, false);
	return ERR_PTR(rc);
}
EXPORT_SYMBOL(ceph_get_direct_page_vector);

void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
{
	int i;

	for (i = 0; i < num_pages; i++) {
		if (dirty)
			set_page_dirty_lock(pages[i]);
		put_page(pages[i]);
	}
	kvfree(pages);
}
EXPORT_SYMBOL(ceph_put_page_vector);

void ceph_release_page_vector(struct page **pages, int num_pages)
{
	int i;

	for (i = 0; i < num_pages; i++)
		__free_pages(pages[i], 0);
	kfree(pages);
}
EXPORT_SYMBOL(ceph_release_page_vector);

/*
 * allocate a vector new pages
 */
struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags)
{
	struct page **pages;
	int i;

	pages = kmalloc(sizeof(*pages) * num_pages, flags);
	if (!pages)
		return ERR_PTR(-ENOMEM);
	for (i = 0; i < num_pages; i++) {
		pages[i] = __page_cache_alloc(flags);
		if (pages[i] == NULL) {
			ceph_release_page_vector(pages, i);
			return ERR_PTR(-ENOMEM);
		}
	}
	return pages;
}
EXPORT_SYMBOL(ceph_alloc_page_vector);

/*
 * copy user data into a page vector
 */
int ceph_copy_user_to_page_vector(struct page **pages,
					 const void __user *data,
					 loff_t off, size_t len)
{
	int i = 0;
	int po = off & ~PAGE_MASK;
	int left = len;
	int l, bad;

	while (left > 0) {
		l = min_t(int, PAGE_SIZE-po, left);
		bad = copy_from_user(page_address(pages[i]) + po, data, l);
		if (bad == l)
			return -EFAULT;
		data += l - bad;
		left -= l - bad;
		po += l - bad;
		if (po == PAGE_SIZE) {
			po = 0;
			i++;
		}
	}
	return len;
}
EXPORT_SYMBOL(ceph_copy_user_to_page_vector);

void ceph_copy_to_page_vector(struct page **pages,
				    const void *data,
				    loff_t off, size_t len)
{
	int i = 0;
	size_t po = off & ~PAGE_MASK;
	size_t left = len;

	while (left > 0) {
		size_t l = min_t(size_t, PAGE_SIZE-po, left);

		memcpy(page_address(pages[i]) + po, data, l);
		data += l;
		left -= l;
		po += l;
		if (po == PAGE_SIZE) {
			po = 0;
			i++;
		}
	}
}
EXPORT_SYMBOL(ceph_copy_to_page_vector);

void ceph_copy_from_page_vector(struct page **pages,
				    void *data,
				    loff_t off, size_t len)
{
	int i = 0;
	size_t po = off & ~PAGE_MASK;
	size_t left = len;

	while (left > 0) {
		size_t l = min_t(size_t, PAGE_SIZE-po, left);

		memcpy(data, page_address(pages[i]) + po, l);
		data += l;
		left -= l;
		po += l;
		if (po == PAGE_SIZE) {
			po = 0;
			i++;
		}
	}
}
EXPORT_SYMBOL(ceph_copy_from_page_vector);

/*
 * Zero an extent within a page vector.  Offset is relative to the
 * start of the first page.
 */
void ceph_zero_page_vector_range(int off, int len, struct page **pages)
{
	int i = off >> PAGE_SHIFT;

	off &= ~PAGE_MASK;

	dout("zero_page_vector_page %u~%u\n", off, len);

	/* leading partial page? */
	if (off) {
		int end = min((int)PAGE_SIZE, off + len);
		dout("zeroing %d %p head from %d\n", i, pages[i],
		     (int)off);
		zero_user_segment(pages[i], off, end);
		len -= (end - off);
		i++;
	}
	while (len >= PAGE_SIZE) {
		dout("zeroing %d %p len=%d\n", i, pages[i], len);
		zero_user_segment(pages[i], 0, PAGE_SIZE);
		len -= PAGE_SIZE;
		i++;
	}
	/* trailing partial page? */
	if (len) {
		dout("zeroing %d %p tail to %d\n", i, pages[i], (int)len);
		zero_user_segment(pages[i], 0, len);
	}
}
EXPORT_SYMBOL(ceph_zero_page_vector_range);

</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Chanwoo Choi &lt;cw00.choi@samsung.com&gt;</td><td class='right'>2016-04-15 15:32:53 +0900</td></tr>
<tr><th>committer</th><td>Sylwester Nawrocki &lt;s.nawrocki@samsung.com&gt;</td><td class='right'>2016-04-15 18:13:45 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f'>81fed6e342c04a4ecb0650c914d24bd57c6c168f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/devicetree?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f'>6b0d48e7ef66a2a9cb655dba3c18596cbf181cdc</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/devicetree?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f'>Documentation/devicetree</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree?id=72b67b3fcb5f500e73dfd42dce3a4749ba84e4bf'>72b67b3fcb5f500e73dfd42dce3a4749ba84e4bf</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/devicetree?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f&amp;id2=72b67b3fcb5f500e73dfd42dce3a4749ba84e4bf'>diff</a>)</td></tr></table>
<div class='commit-subject'>clk: samsung: exynos542x: Add the clock id for ACLK</div><div class='commit-msg'>This patch adds the clock id for ACLK clock which is source clock
of AMBA AXI bus. This clock should be handled in the bus frequency
scaling driver.

Signed-off-by: Chanwoo Choi &lt;cw00.choi@samsung.com&gt;
Tested-by: Markus Reichl &lt;m.reichl@fivetechno.de&gt;
Tested-by: Anand Moon &lt;linux.amoon@gmail.com&gt;
Reviewed-by: Krzysztof Kozlowski &lt;k.kozlowski@samsung.com&gt;
Signed-off-by: Sylwester Nawrocki &lt;s.nawrocki@samsung.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=81fed6e342c04a4ecb0650c914d24bd57c6c168f'>Diffstat</a> (limited to 'Documentation/devicetree')</div><table summary='diffstat' class='diffstat'>