/*
 *  linux/fs/nfs/symlink.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  Optimization changes Copyright (C) 1994 Florian La Roche
 *
 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
 *
 *  nfs symlink handling code
 */

#include <linux/time.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/string.h>

/* Symlink caching in the page cache is even more simplistic
 * and straight-forward than readdir caching.
 */

static int nfs_symlink_filler(struct inode *inode, struct page *page)
{
	int error;

	error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE);
	if (error < 0)
		goto error;
	SetPageUptodate(page);
	unlock_page(page);
	return 0;

error:
	SetPageError(page);
	unlock_page(page);
	return -EIO;
}

static const char *nfs_get_link(struct dentry *dentry,
				struct inode *inode,
				struct delayed_call *done)
{
	struct page *page;
	void *err;

	if (!dentry) {
		err = ERR_PTR(nfs_revalidate_mapping_rcu(inode));
		if (err)
			return err;
		page = find_get_page(inode->i_mapping, 0);
		if (!page)
			return ERR_PTR(-ECHILD);
		if (!PageUptodate(page)) {
			put_page(page);
			return ERR_PTR(-ECHILD);
		}
	} else {
		err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
		if (err)
			return err;
		page = read_cache_page(&inode->i_data, 0,
					(filler_t *)nfs_symlink_filler, inode);
		if (IS_ERR(page))
			return ERR_CAST(page);
	}
	set_delayed_call(done, page_put_link, page);
	return page_address(page);
}

/*
 * symlinks can't do much...
 */
const struct inode_operations nfs_symlink_inode_operations = {
	.get_link	= nfs_get_link,
	.getattr	= nfs_getattr,
	.setattr	= nfs_setattr,
};
rivers/usb/gadget/function/f_uvc.h'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/gadget/function/f_uvc.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>gadget</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>function</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>f_uvc.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='52e02f2797cf44e00da987a7736cc0f5192132f7'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-31 13:07:04 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-31 13:07:04 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>52e02f2797cf44e00da987a7736cc0f5192132f7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>5edb83141db6c9544feb9a47c5e50ccd173d5e49</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>drivers/usb/gadget/function/f_uvc.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function/f_uvc.h?id=c9194b99ae1825bdbafc701965442a47739ff0ad'>c9194b99ae1825bdbafc701965442a47739ff0ad</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7&amp;id2=c9194b99ae1825bdbafc701965442a47739ff0ad'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/function/f_uvc.h?id=064c3db9c564cc5be514ac21fb4aa26cc33db746'>064c3db9c564cc5be514ac21fb4aa26cc33db746</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/function/f_uvc.h?id=52e02f2797cf44e00da987a7736cc0f5192132f7&amp;id2=064c3db9c564cc5be514ac21fb4aa26cc33db746'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-4.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata</div><div class='commit-msg'>Pull libata fixes from Tejun Heo:
 "Three libata fixes: an error handling fix, blacklist addition for
  another fallout from upping the default max sectors, and fix for a
  sense data reporting bug which affects new harddrives which can report
  sense data"

* 'for-4.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  ata: sata_mv:- Handle return value of devm_ioremap.
  libata: Fix ATA request sense
  libata: apply MAX_SEC_1024 to all CX1-JB*-HP devices
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=52e02f2797cf44e00da987a7736cc0f5192132f7'>Diffstat</a> (limited to 'drivers/usb/gadget/function/f_uvc.h')</div><table summary='diffstat' class='diffstat'>