#include <linux/export.h>
#include <linux/fs.h>
#include <linux/fs_stack.h>

/* does _NOT_ require i_mutex to be held.
 *
 * This function cannot be inlined since i_size_{read,write} is rather
 * heavy-weight on 32-bit systems
 */
void fsstack_copy_inode_size(struct inode *dst, struct inode *src)
{
	loff_t i_size;
	blkcnt_t i_blocks;

	/*
	 * i_size_read() includes its own seqlocking and protection from
	 * preemption (see include/linux/fs.h): we need nothing extra for
	 * that here, and prefer to avoid nesting locks than attempt to keep
	 * i_size and i_blocks in sync together.
	 */
	i_size = i_size_read(src);

	/*
	 * But if CONFIG_LBDAF (on 32-bit), we ought to make an effort to
	 * keep the two halves of i_blocks in sync despite SMP or PREEMPT -
	 * though stat's generic_fillattr() doesn't bother, and we won't be
	 * applying quotas (where i_blocks does become important) at the
	 * upper level.
	 *
	 * We don't actually know what locking is used at the lower level;
	 * but if it's a filesystem that supports quotas, it will be using
	 * i_lock as in inode_add_bytes().
	 */
	if (sizeof(i_blocks) > sizeof(long))
		spin_lock(&src->i_lock);
	i_blocks = src->i_blocks;
	if (sizeof(i_blocks) > sizeof(long))
		spin_unlock(&src->i_lock);

	/*
	 * If CONFIG_SMP or CONFIG_PREEMPT on 32-bit, it's vital for
	 * fsstack_copy_inode_size() to hold some lock around
	 * i_size_write(), otherwise i_size_read() may spin forever (see
	 * include/linux/fs.h).  We don't necessarily hold i_mutex when this
	 * is called, so take i_lock for that case.
	 *
	 * And if CONFIG_LBDAF (on 32-bit), continue our effort to keep the
	 * two halves of i_blocks in sync despite SMP or PREEMPT: use i_lock
	 * for that case too, and do both at once by combining the tests.
	 *
	 * There is none of this locking overhead in the 64-bit case.
	 */
	if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long))
		spin_lock(&dst->i_lock);
	i_size_write(dst, i_size);
	dst->i_blocks = i_blocks;
	if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long))
		spin_unlock(&dst->i_lock);
}
EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);

/* copy all attributes */
void fsstack_copy_attr_all(struct inode *dest, const struct inode *src)
{
	dest->i_mode = src->i_mode;
	dest->i_uid = src->i_uid;
	dest->i_gid = src->i_gid;
	dest->i_rdev = src->i_rdev;
	dest->i_atime = src->i_atime;
	dest->i_mtime = src->i_mtime;
	dest->i_ctime = src->i_ctime;
	dest->i_blkbits = src->i_blkbits;
	dest->i_flags = src->i_flags;
	set_nlink(dest, src->i_nlink);
}
EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/dccp?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>dccp</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>qpolicy.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='83280e90ef001f77a64e2ce59c25ab66e47ab1f0'/><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'>2017-01-08 11:42:04 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-08 11:42:04 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>83280e90ef001f77a64e2ce59c25ab66e47ab1f0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>ec0a5842e2fbc0f4abaff55299acac397b8da5c3</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>net/dccp/qpolicy.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dccp/qpolicy.c?id=cc250e267bd56c531b0bee455fc724d50af83fac'>cc250e267bd56c531b0bee455fc724d50af83fac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0&amp;id2=cc250e267bd56c531b0bee455fc724d50af83fac'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dccp/qpolicy.c?id=0a8fd1346254974c3a852338508e4a4cddbb35f1'>0a8fd1346254974c3a852338508e4a4cddbb35f1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/dccp/qpolicy.c?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0&amp;id2=0a8fd1346254974c3a852338508e4a4cddbb35f1'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb</div><div class='commit-msg'>Pull USB fixes from Greg KH:
 "Here are a bunch of USB fixes for 4.10-rc3. Yeah, it's a lot, an
  artifact of the holiday break I think.

  Lots of gadget and the usual XHCI fixups for reported issues (one day
  that driver will calm down...) Also included are a bunch of usb-serial
  driver fixes, and for good measure, a number of much-reported MUSB
  driver issues have finally been resolved.

  All of these have been in linux-next with no reported issues"

* tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (72 commits)
  USB: fix problems with duplicate endpoint addresses
  usb: ohci-at91: use descriptor-based gpio APIs correctly
  usb: storage: unusual_uas: Add JMicron JMS56x to unusual device
  usb: hub: Move hub_port_disable() to fix warning if PM is disabled
  usb: musb: blackfin: add bfin_fifo_offset in bfin_ops
  usb: musb: fix compilation warning on unused function
  usb: musb: Fix trying to free already-free IRQ 4
  usb: musb: dsps: implement clear_ep_rxintr() callback
  usb: musb: core: add clear_ep_rxintr() to musb_platform_ops
  USB: serial: ti_usb_3410_5052: fix NULL-deref at open
  USB: serial: spcp8x5: fix NULL-deref at open
  USB: serial: quatech2: fix sleep-while-atomic in close
  USB: serial: pl2303: fix NULL-deref at open
  USB: serial: oti6858: fix NULL-deref at open
  USB: serial: omninet: fix NULL-derefs at open and disconnect
  USB: serial: mos7840: fix misleading interrupt-URB comment
  USB: serial: mos7840: remove unused write URB
  USB: serial: mos7840: fix NULL-deref at open
  USB: serial: mos7720: remove obsolete port initialisation
  USB: serial: mos7720: fix parallel probe
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>Diffstat</a> (limited to 'net/dccp/qpolicy.c')</div><table summary='diffstat' class='diffstat'>