[linux-2.6-block.git] / fs / ceph / cache.c

/*
 * Ceph cache definitions.
 *
 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
 *  Written by Milosz Tanski (milosz@adfin.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include "super.h"
#include "cache.h"

struct ceph_aux_inode {
	struct timespec	mtime;
	loff_t          size;
};

struct fscache_netfs ceph_cache_netfs = {
	.name		= "ceph",
	.version	= 0,
};

static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data,
					     void *buffer, uint16_t maxbuf)
{
	const struct ceph_fs_client* fsc = cookie_netfs_data;
	uint16_t klen;

	klen = sizeof(fsc->client->fsid);
	if (klen > maxbuf)
		return 0;

	memcpy(buffer, &fsc->client->fsid, klen);
	return klen;
}

static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
	.name		= "CEPH.fsid",
	.type		= FSCACHE_COOKIE_TYPE_INDEX,
	.get_key	= ceph_fscache_session_get_key,
};

int ceph_fscache_register(void)
{
	return fscache_register_netfs(&ceph_cache_netfs);
}

void ceph_fscache_unregister(void)
{
	fscache_unregister_netfs(&ceph_cache_netfs);
}

int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
{
	fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
					      &ceph_fscache_fsid_object_def,
					      fsc, true);

	if (fsc->fscache == NULL) {
		pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
		return 0;
	}

	fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1);
	if (fsc->revalidate_wq == NULL)
		return -ENOMEM;

	return 0;
}

static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data,
					   void *buffer, uint16_t maxbuf)
{
	const struct ceph_inode_info* ci = cookie_netfs_data;
	uint16_t klen;

	/* use ceph virtual inode (id + snaphot) */
	klen = sizeof(ci->i_vino);
	if (klen > maxbuf)
		return 0;

	memcpy(buffer, &ci->i_vino, klen);
	return klen;
}

static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data,
					   void *buffer, uint16_t bufmax)
{
	struct ceph_aux_inode aux;
	const struct ceph_inode_info* ci = cookie_netfs_data;
	const struct inode* inode = &ci->vfs_inode;

	memset(&aux, 0, sizeof(aux));
	aux.mtime = inode->i_mtime;
	aux.size = inode->i_size;

	memcpy(buffer, &aux, sizeof(aux));

	return sizeof(aux);
}

static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data,
					uint64_t *size)
{
	const struct ceph_inode_info* ci = cookie_netfs_data;
	const struct inode* inode = &ci->vfs_inode;

	*size = inode->i_size;
}

static enum fscache_checkaux ceph_fscache_inode_check_aux(
	void *cookie_netfs_data, const void *data, uint16_t dlen)
{
	struct ceph_aux_inode aux;
	struct ceph_inode_info* ci = cookie_netfs_data;
	struct inode* inode = &ci->vfs_inode;

	if (dlen != sizeof(aux))
		return FSCACHE_CHECKAUX_OBSOLETE;

	memset(&aux, 0, sizeof(aux));
	aux.mtime = inode->i_mtime;
	aux.size = inode->i_size;

	if (memcmp(data, &aux, sizeof(aux)) != 0)
		return FSCACHE_CHECKAUX_OBSOLETE;

	dout("ceph inode 0x%p cached okay", ci);
	return FSCACHE_CHECKAUX_OKAY;
}

static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data)
{
	struct ceph_inode_info* ci = cookie_netfs_data;
	struct pagevec pvec;
	pgoff_t first;
	int loop, nr_pages;

	pagevec_init(&pvec, 0);
	first = 0;

	dout("ceph inode 0x%p now uncached", ci);

	while (1) {
		nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first,
					  PAGEVEC_SIZE - pagevec_count(&pvec));

		if (!nr_pages)
			break;

		for (loop = 0; loop < nr_pages; loop++)
			ClearPageFsCache(pvec.pages[loop]);

		first = pvec.pages[nr_pages - 1]->index + 1;

		pvec.nr = nr_pages;
		pagevec_release(&pvec);
		cond_resched();
	}
}

static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
	.name		= "CEPH.inode",
	.type		= FSCACHE_COOKIE_TYPE_DATAFILE,
	.get_key	= ceph_fscache_inode_get_key,
	.get_attr	= ceph_fscache_inode_get_attr,
	.get_aux	= ceph_fscache_inode_get_aux,
	.check_aux	= ceph_fscache_inode_check_aux,
	.now_uncached	= ceph_fscache_inode_now_uncached,
};

void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
					struct ceph_inode_info* ci)
{
	struct inode* inode = &ci->vfs_inode;

	/* No caching for filesystem */
	if (fsc->fscache == NULL)
		return;

	/* Only cache for regular files that are read only */
	if ((ci->vfs_inode.i_mode & S_IFREG) == 0)
		return;

	/* Avoid multiple racing open requests */
	mutex_lock(&inode->i_mutex);

	if (ci->fscache)
		goto done;

	ci->fscache = fscache_acquire_cookie(fsc->fscache,
					     &ceph_fscache_inode_object_def,
					     ci, true);
	fscache_check_consistency(ci->fscache);
done:
	mutex_unlock(&inode->i_mutex);

}

void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
{
	struct fscache_cookie* cookie;

	if ((cookie = ci->fscache) == NULL)
		return;

	ci->fscache = NULL;

	fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
	fscache_relinquish_cookie(cookie, 0);
}

static void ceph_vfs_readpage_complete(struct page *page, void *data, int error)
{
	if (!error)
		SetPageUptodate(page);
}

static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error)
{
	if (!error)
		SetPageUptodate(page);

	unlock_page(page);
}

static inline int cache_valid(struct ceph_inode_info *ci)
{
	return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) &&
		(ci->i_fscache_gen == ci->i_rdcache_gen));
}


/* Atempt to read from the fscache,
 *
 * This function is called from the readpage_nounlock context. DO NOT attempt to
 * unlock the page here (or in the callback).
 */
int ceph_readpage_from_fscache(struct inode *inode, struct page *page)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int ret;

	if (!cache_valid(ci))
		return -ENOBUFS;

	ret = fscache_read_or_alloc_page(ci->fscache, page,
					 ceph_vfs_readpage_complete, NULL,
					 GFP_KERNEL);

	switch (ret) {
		case 0: /* Page found */
			dout("page read submitted\n");
			return 0;
		case -ENOBUFS: /* Pages were not found, and can't be */
		case -ENODATA: /* Pages were not found */
			dout("page/inode not in cache\n");
			return ret;
		default:
			dout("%s: unknown error ret = %i\n", __func__, ret);
			return ret;
	}
}

int ceph_readpages_from_fscache(struct inode *inode,
				  struct address_space *mapping,
				  struct list_head *pages,
				  unsigned *nr_pages)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int ret;

	if (!cache_valid(ci))
		return -ENOBUFS;

	ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
					  ceph_vfs_readpage_complete_unlock,
					  NULL, mapping_gfp_mask(mapping));

	switch (ret) {
		case 0: /* All pages found */
			dout("all-page read submitted\n");
			return 0;
		case -ENOBUFS: /* Some pages were not found, and can't be */
		case -ENODATA: /* some pages were not found */
			dout("page/inode not in cache\n");
			return ret;
		default:
			dout("%s: unknown error ret = %i\n", __func__, ret);
			return ret;
	}
}

void ceph_readpage_to_fscache(struct inode *inode, struct page *page)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int ret;

	if (!PageFsCache(page))
		return;

	if (!cache_valid(ci))
		return;

	ret = fscache_write_page(ci->fscache, page, GFP_KERNEL);
	if (ret)
		 fscache_uncache_page(ci->fscache, page);
}

void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
{
	struct ceph_inode_info *ci = ceph_inode(inode);

	if (!PageFsCache(page))
		return;

	fscache_wait_on_page_write(ci->fscache, page);
	fscache_uncache_page(ci->fscache, page);
}

void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
	if (fsc->revalidate_wq)
		destroy_workqueue(fsc->revalidate_wq);

	fscache_relinquish_cookie(fsc->fscache, 0);
	fsc->fscache = NULL;
}

static void ceph_revalidate_work(struct work_struct *work)
{
	int issued;
	u32 orig_gen;
	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
						  i_revalidate_work);
	struct inode *inode = &ci->vfs_inode;

	spin_lock(&ci->i_ceph_lock);
	issued = __ceph_caps_issued(ci, NULL);
	orig_gen = ci->i_rdcache_gen;
	spin_unlock(&ci->i_ceph_lock);

	if (!(issued & CEPH_CAP_FILE_CACHE)) {
		dout("revalidate_work lost cache before validation %p\n",
		     inode);
		goto out;
	}

	if (!fscache_check_consistency(ci->fscache))
		fscache_invalidate(ci->fscache);

	spin_lock(&ci->i_ceph_lock);
	/* Update the new valid generation (backwards sanity check too) */
	if (orig_gen > ci->i_fscache_gen) {
		ci->i_fscache_gen = orig_gen;
	}
	spin_unlock(&ci->i_ceph_lock);

out:
	iput(&ci->vfs_inode);
}

void ceph_queue_revalidate(struct inode *inode)
{
	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
	struct ceph_inode_info *ci = ceph_inode(inode);

	if (fsc->revalidate_wq == NULL || ci->fscache == NULL)
		return;

	ihold(inode);

	if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq,
		       &ci->i_revalidate_work)) {
		dout("ceph_queue_revalidate %p\n", inode);
	} else {
		dout("ceph_queue_revalidate %p failed\n)", inode);
		iput(inode);
	}
}

void ceph_fscache_inode_init(struct ceph_inode_info *ci)
{
	ci->fscache = NULL;
	/* The first load is verifed cookie open time */
	ci->i_fscache_gen = 1;
	INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work);
}
Commit	Line	Data
99ccbd22 MT	1	/*
	2	* Ceph cache definitions.
	3	*
	4	* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
	5	* Written by Milosz Tanski (milosz@adfin.com)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2
	9	* as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to:
	18	* Free Software Foundation
	19	* 51 Franklin Street, Fifth Floor
	20	* Boston, MA 02111-1301 USA
	21	*
	22	*/
	23
99ccbd22 MT	24	#include "super.h"
	25	#include "cache.h"
	26
	27	struct ceph_aux_inode {
	28	struct timespec mtime;
	29	loff_t size;
	30	};
	31
	32	struct fscache_netfs ceph_cache_netfs = {
	33	.name = "ceph",
	34	.version = 0,
	35	};
	36
	37	static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data,
	38	void *buffer, uint16_t maxbuf)
	39	{
	40	const struct ceph_fs_client* fsc = cookie_netfs_data;
	41	uint16_t klen;
	42
	43	klen = sizeof(fsc->client->fsid);
	44	if (klen > maxbuf)
	45	return 0;
	46
	47	memcpy(buffer, &fsc->client->fsid, klen);
	48	return klen;
	49	}
	50
	51	static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
	52	.name = "CEPH.fsid",
	53	.type = FSCACHE_COOKIE_TYPE_INDEX,
	54	.get_key = ceph_fscache_session_get_key,
	55	};
	56
971f0bde	57	int ceph_fscache_register(void)
99ccbd22 MT	58	{
	59	return fscache_register_netfs(&ceph_cache_netfs);
	60	}
	61
971f0bde	62	void ceph_fscache_unregister(void)
99ccbd22 MT	63	{
	64	fscache_unregister_netfs(&ceph_cache_netfs);
	65	}
	66
	67	int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
	68	{
	69	fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
	70	&ceph_fscache_fsid_object_def,
94d30ae9	71	fsc, true);
99ccbd22 MT	72
	73	if (fsc->fscache == NULL) {
	74	pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
	75	return 0;
	76	}
	77
	78	fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1);
	79	if (fsc->revalidate_wq == NULL)
	80	return -ENOMEM;
	81
	82	return 0;
	83	}
	84
	85	static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data,
	86	void *buffer, uint16_t maxbuf)
	87	{
	88	const struct ceph_inode_info* ci = cookie_netfs_data;
	89	uint16_t klen;
	90
	91	/* use ceph virtual inode (id + snaphot) */
	92	klen = sizeof(ci->i_vino);
	93	if (klen > maxbuf)
	94	return 0;
	95
	96	memcpy(buffer, &ci->i_vino, klen);
	97	return klen;
	98	}
	99
	100	static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data,
	101	void *buffer, uint16_t bufmax)
	102	{
	103	struct ceph_aux_inode aux;
	104	const struct ceph_inode_info* ci = cookie_netfs_data;
	105	const struct inode* inode = &ci->vfs_inode;
	106
	107	memset(&aux, 0, sizeof(aux));
	108	aux.mtime = inode->i_mtime;
	109	aux.size = inode->i_size;
	110
	111	memcpy(buffer, &aux, sizeof(aux));
	112
	113	return sizeof(aux);
	114	}
	115
	116	static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data,
	117	uint64_t *size)
	118	{
	119	const struct ceph_inode_info* ci = cookie_netfs_data;
	120	const struct inode* inode = &ci->vfs_inode;
	121
	122	*size = inode->i_size;
	123	}
	124
	125	static enum fscache_checkaux ceph_fscache_inode_check_aux(
	126	void cookie_netfs_data, const void data, uint16_t dlen)
	127	{
	128	struct ceph_aux_inode aux;
	129	struct ceph_inode_info* ci = cookie_netfs_data;
	130	struct inode* inode = &ci->vfs_inode;
	131
	132	if (dlen != sizeof(aux))
	133	return FSCACHE_CHECKAUX_OBSOLETE;
	134
	135	memset(&aux, 0, sizeof(aux));
136	aux.mtime = inode->i_mtime;
137	aux.size = inode->i_size;
138
139	if (memcmp(data, &aux, sizeof(aux)) != 0)
140	return FSCACHE_CHECKAUX_OBSOLETE;
141
142	dout("ceph inode 0x%p cached okay", ci);
143	return FSCACHE_CHECKAUX_OKAY;
144	}
145
146	static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data)
147	{
148	struct ceph_inode_info* ci = cookie_netfs_data;
149	struct pagevec pvec;
150	pgoff_t first;
151	int loop, nr_pages;
152
153	pagevec_init(&pvec, 0);
154	first = 0;
155
156	dout("ceph inode 0x%p now uncached", ci);
157
158	while (1) {
159	nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first,
160	PAGEVEC_SIZE - pagevec_count(&pvec));
161
162	if (!nr_pages)
163	break;
164
165	for (loop = 0; loop < nr_pages; loop++)
166	ClearPageFsCache(pvec.pages[loop]);
167
168	first = pvec.pages[nr_pages - 1]->index + 1;
169
170	pvec.nr = nr_pages;
171	pagevec_release(&pvec);
172	cond_resched();
173	}
174	}
175
176	static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
177	.name = "CEPH.inode",
178	.type = FSCACHE_COOKIE_TYPE_DATAFILE,
179	.get_key = ceph_fscache_inode_get_key,
180	.get_attr = ceph_fscache_inode_get_attr,
181	.get_aux = ceph_fscache_inode_get_aux,
182	.check_aux = ceph_fscache_inode_check_aux,
183	.now_uncached = ceph_fscache_inode_now_uncached,
184	};
185
186	void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
187	struct ceph_inode_info* ci)
188	{
189	struct inode* inode = &ci->vfs_inode;
190
191	/* No caching for filesystem */
192	if (fsc->fscache == NULL)
193	return;
194
195	/* Only cache for regular files that are read only */
196	if ((ci->vfs_inode.i_mode & S_IFREG) == 0)
197	return;
198
199	/* Avoid multiple racing open requests */
200	mutex_lock(&inode->i_mutex);
201
202	if (ci->fscache)
203	goto done;
204
205	ci->fscache = fscache_acquire_cookie(fsc->fscache,
206	&ceph_fscache_inode_object_def,
94d30ae9	207	ci, true);
f1fc4fee	208	fscache_check_consistency(ci->fscache);
99ccbd22 MT	209	done:
	210	mutex_unlock(&inode->i_mutex);
	211
	212	}
	213
	214	void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
	215	{
	216	struct fscache_cookie* cookie;
	217
	218	if ((cookie = ci->fscache) == NULL)
	219	return;
	220
	221	ci->fscache = NULL;
	222
	223	fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
	224	fscache_relinquish_cookie(cookie, 0);
	225	}
	226
	227	static void ceph_vfs_readpage_complete(struct page page, void data, int error)
	228	{
	229	if (!error)
	230	SetPageUptodate(page);
	231	}
	232
	233	static void ceph_vfs_readpage_complete_unlock(struct page page, void data, int error)
	234	{
	235	if (!error)
	236	SetPageUptodate(page);
	237
	238	unlock_page(page);
	239	}
	240
	241	static inline int cache_valid(struct ceph_inode_info *ci)
	242	{
	243	return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) &&
	244	(ci->i_fscache_gen == ci->i_rdcache_gen));
	245	}
	246
	247
	248	/* Atempt to read from the fscache,
	249	*
	250	* This function is called from the readpage_nounlock context. DO NOT attempt to
	251	* unlock the page here (or in the callback).
	252	*/
	253	int ceph_readpage_from_fscache(struct inode inode, struct page page)
	254	{
	255	struct ceph_inode_info *ci = ceph_inode(inode);
	256	int ret;
	257
	258	if (!cache_valid(ci))
	259	return -ENOBUFS;
	260
	261	ret = fscache_read_or_alloc_page(ci->fscache, page,
	262	ceph_vfs_readpage_complete, NULL,
	263	GFP_KERNEL);
	264
	265	switch (ret) {
	266	case 0: /* Page found */
	267	dout("page read submitted\n");
	268	return 0;
	269	case -ENOBUFS: /* Pages were not found, and can't be */
	270	case -ENODATA: /* Pages were not found */
	271	dout("page/inode not in cache\n");
	272	return ret;
273	default:
274	dout("%s: unknown error ret = %i\n", __func__, ret);
275	return ret;
276	}
277	}
278
279	int ceph_readpages_from_fscache(struct inode *inode,
280	struct address_space *mapping,
281	struct list_head *pages,
282	unsigned *nr_pages)
283	{
284	struct ceph_inode_info *ci = ceph_inode(inode);
285	int ret;
286
287	if (!cache_valid(ci))
288	return -ENOBUFS;
289
290	ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
291	ceph_vfs_readpage_complete_unlock,
292	NULL, mapping_gfp_mask(mapping));
293
294	switch (ret) {
295	case 0: /* All pages found */
296	dout("all-page read submitted\n");
297	return 0;
298	case -ENOBUFS: /* Some pages were not found, and can't be */
299	case -ENODATA: /* some pages were not found */
300	dout("page/inode not in cache\n");
301	return ret;
302	default:
303	dout("%s: unknown error ret = %i\n", __func__, ret);
304	return ret;
305	}
306	}
307
308	void ceph_readpage_to_fscache(struct inode inode, struct page page)
309	{
310	struct ceph_inode_info *ci = ceph_inode(inode);
311	int ret;
312
9b8dd1e8 MT	313	if (!PageFsCache(page))
	314	return;
	315
99ccbd22 MT	316	if (!cache_valid(ci))
	317	return;
	318
	319	ret = fscache_write_page(ci->fscache, page, GFP_KERNEL);
	320	if (ret)
	321	fscache_uncache_page(ci->fscache, page);
	322	}
	323
	324	void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
	325	{
	326	struct ceph_inode_info *ci = ceph_inode(inode);
	327
ffc79664 MT	328	if (!PageFsCache(page))
	329	return;
	330
99ccbd22 MT	331	fscache_wait_on_page_write(ci->fscache, page);
	332	fscache_uncache_page(ci->fscache, page);
	333	}
	334
	335	void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
	336	{
	337	if (fsc->revalidate_wq)
	338	destroy_workqueue(fsc->revalidate_wq);
	339
	340	fscache_relinquish_cookie(fsc->fscache, 0);
	341	fsc->fscache = NULL;
	342	}
	343
	344	static void ceph_revalidate_work(struct work_struct *work)
	345	{
	346	int issued;
	347	u32 orig_gen;
	348	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
	349	i_revalidate_work);
	350	struct inode *inode = &ci->vfs_inode;
	351
	352	spin_lock(&ci->i_ceph_lock);
	353	issued = __ceph_caps_issued(ci, NULL);
	354	orig_gen = ci->i_rdcache_gen;
	355	spin_unlock(&ci->i_ceph_lock);
	356
	357	if (!(issued & CEPH_CAP_FILE_CACHE)) {
	358	dout("revalidate_work lost cache before validation %p\n",
	359	inode);
	360	goto out;
	361	}
	362
	363	if (!fscache_check_consistency(ci->fscache))
	364	fscache_invalidate(ci->fscache);
	365
	366	spin_lock(&ci->i_ceph_lock);
	367	/* Update the new valid generation (backwards sanity check too) */
	368	if (orig_gen > ci->i_fscache_gen) {
	369	ci->i_fscache_gen = orig_gen;
	370	}
	371	spin_unlock(&ci->i_ceph_lock);
	372
	373	out:
	374	iput(&ci->vfs_inode);
	375	}
	376
	377	void ceph_queue_revalidate(struct inode *inode)
	378	{
e81568eb	379	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
99ccbd22 MT	380	struct ceph_inode_info *ci = ceph_inode(inode);
99ccbd22 MT	381
e81568eb MT	382	if (fsc->revalidate_wq == NULL \|\| ci->fscache == NULL)
	383	return;
	384
99ccbd22 MT	385	ihold(inode);
	386
	387	if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq,
	388	&ci->i_revalidate_work)) {
	389	dout("ceph_queue_revalidate %p\n", inode);
	390	} else {
	391	dout("ceph_queue_revalidate %p failed\n)", inode);
	392	iput(inode);
	393	}
	394	}
	395
	396	void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	397	{
	398	ci->fscache = NULL;
	399	/* The first load is verifed cookie open time */
	400	ci->i_fscache_gen = 1;
	401	INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work);
	402	}