/*
 * ifile.c - NILFS inode file
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by Amagai Yoshiji.
 * Revised by Ryusuke Konishi.
 *
 */

#include <linux/types.h>
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "mdt.h"
#include "alloc.h"
#include "ifile.h"

/**
 * struct nilfs_ifile_info - on-memory private data of ifile
 * @mi: on-memory private data of metadata file
 * @palloc_cache: persistent object allocator cache of ifile
 */
struct nilfs_ifile_info {
	struct nilfs_mdt_info mi;
	struct nilfs_palloc_cache palloc_cache;
};

static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
{
	return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
}

/**
 * nilfs_ifile_create_inode - create a new disk inode
 * @ifile: ifile inode
 * @out_ino: pointer to a variable to store inode number
 * @out_bh: buffer_head contains newly allocated disk inode
 *
 * Return Value: On success, 0 is returned and the newly allocated inode
 * number is stored in the place pointed by @ino, and buffer_head pointer
 * that contains newly allocated disk inode structure is stored in the
 * place pointed by @out_bh
 * On error, one of the following negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOSPC - No inode left.
 */
int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
			     struct buffer_head **out_bh)
{
	struct nilfs_palloc_req req;
	int ret;

	req.pr_entry_nr = 0;  /*
			       * 0 says find free inode from beginning
			       * of a group. dull code!!
			       */
	req.pr_entry_bh = NULL;

	ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
	if (!ret) {
		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
						   &req.pr_entry_bh);
		if (ret < 0)
			nilfs_palloc_abort_alloc_entry(ifile, &req);
	}
	if (ret < 0) {
		brelse(req.pr_entry_bh);
		return ret;
	}
	nilfs_palloc_commit_alloc_entry(ifile, &req);
	mark_buffer_dirty(req.pr_entry_bh);
	nilfs_mdt_mark_dirty(ifile);
	*out_ino = (ino_t)req.pr_entry_nr;
	*out_bh = req.pr_entry_bh;
	return 0;
}

/**
 * nilfs_ifile_delete_inode - delete a disk inode
 * @ifile: ifile inode
 * @ino: inode number
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOENT - The inode number @ino have not been allocated.
 */
int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
{
	struct nilfs_palloc_req req = {
		.pr_entry_nr = ino, .pr_entry_bh = NULL
	};
	struct nilfs_inode *raw_inode;
	void *kaddr;
	int ret;

	ret = nilfs_palloc_prepare_free_entry(ifile, &req);
	if (!ret) {
		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
						   &req.pr_entry_bh);
		if (ret < 0)
			nilfs_palloc_abort_free_entry(ifile, &req);
	}
	if (ret < 0) {
		brelse(req.pr_entry_bh);
		return ret;
	}

	kaddr = kmap_atomic(req.pr_entry_bh->b_page);
	raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
						 req.pr_entry_bh, kaddr);
	raw_inode->i_flags = 0;
	kunmap_atomic(kaddr);

	mark_buffer_dirty(req.pr_entry_bh);
	brelse(req.pr_entry_bh);

	nilfs_palloc_commit_free_entry(ifile, &req);

	return 0;
}

int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
				struct buffer_head **out_bh)
{
	struct super_block *sb = ifile->i_sb;
	int err;

	if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
		nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
		return -EINVAL;
	}

	err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
	if (unlikely(err))
		nilfs_msg(sb, KERN_WARNING, "error %d reading inode: ino=%lu",
			  err, (unsigned long)ino);
	return err;
}

/**
 * nilfs_ifile_count_free_inodes - calculate free inodes count
 * @ifile: ifile inode
 * @nmaxinodes: current maximum of available inodes count [out]
 * @nfreeinodes: free inodes count [out]
 */
int nilfs_ifile_count_free_inodes(struct inode *ifile,
				    u64 *nmaxinodes, u64 *nfreeinodes)
{
	u64 nused;
	int err;

	*nmaxinodes = 0;
	*nfreeinodes = 0;

	nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
	err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
	if (likely(!err))
		*nfreeinodes = *nmaxinodes - nused;
	return err;
}

/**
 * nilfs_ifile_read - read or get ifile inode
 * @sb: super block instance
 * @root: root object
 * @inode_size: size of an inode
 * @raw_inode: on-disk ifile inode
 * @inodep: buffer to store the inode
 */
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
		     size_t inode_size, struct nilfs_inode *raw_inode,
		     struct inode **inodep)
{
	struct inode *ifile;
	int err;

	ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
	if (unlikely(!ifile))
		return -ENOMEM;
	if (!(ifile->i_state & I_NEW))
		goto out;

	err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
			     sizeof(struct nilfs_ifile_info));
	if (err)
		goto failed;

	err = nilfs_palloc_init_blockgroup(ifile, inode_size);
	if (err)
		goto failed;

	nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);

	err = nilfs_read_inode_common(ifile, raw_inode);
	if (err)
		goto failed;

	unlock_new_inode(ifile);
 out:
	*inodep = ifile;
	return 0;
 failed:
	iget_failed(ifile);
	return err;
}
936190e86a16ee8c&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr></table>
<div class='commit-subject'>irqdomain: Avoid activating interrupts more than once</div><div class='commit-msg'>Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are
activated early"), we can end-up activating a PCI/MSI twice (once
at allocation time, and once at startup time).

This is normally of no consequences, except that there is some
HW out there that may misbehave if activate is used more than once
(the GICv3 ITS, for example, uses the activate callback
to issue the MAPVI command, and the architecture spec says that
"If there is an existing mapping for the EventID-DeviceID
combination, behavior is UNPREDICTABLE").

While this could be worked around in each individual driver, it may
make more sense to tackle the issue at the core level. In order to
avoid getting in that situation, let's have a per-interrupt flag
to remember if we have already activated that interrupt or not.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Reported-and-tested-by: Andre Przywara &lt;andre.przywara@arm.com&gt;
Signed-off-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>Diffstat</a> (limited to 'include/drm/drm_property.h')</div><table summary='diffstat' class='diffstat'>