[linux.git] / fs / ceph / cache.c

/*
 * Ceph cache definitions.
 *
 *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
 *  Written by Milosz Tanski ([email protected])
 *
 *  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 + snapshot) */
	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 = i_size_read(inode);

	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;
	*size = i_size_read(&ci->vfs_inode);
}

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 = i_size_read(inode);

	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 */
	inode_lock(inode);

	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:
	inode_unlock(inode);

}

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 ([email protected])
	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
1291fb95	91	/* use ceph virtual inode (id + snapshot) */
99ccbd22 MT	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;
99c88e69	109	aux.size = i_size_read(inode);
99ccbd22 MT	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;
99c88e69	120	*size = i_size_read(&ci->vfs_inode);
99ccbd22 MT	121	}
	122
	123	static enum fscache_checkaux ceph_fscache_inode_check_aux(
	124	void cookie_netfs_data, const void data, uint16_t dlen)
	125	{
	126	struct ceph_aux_inode aux;
	127	struct ceph_inode_info* ci = cookie_netfs_data;
	128	struct inode* inode = &ci->vfs_inode;
	129
	130	if (dlen != sizeof(aux))
	131	return FSCACHE_CHECKAUX_OBSOLETE;
	132
	133	memset(&aux, 0, sizeof(aux));
	134	aux.mtime = inode->i_mtime;
99c88e69	135	aux.size = i_size_read(inode);
99ccbd22 MT	136
	137	if (memcmp(data, &aux, sizeof(aux)) != 0)
	138	return FSCACHE_CHECKAUX_OBSOLETE;
	139
	140	dout("ceph inode 0x%p cached okay", ci);
	141	return FSCACHE_CHECKAUX_OKAY;
	142	}
	143
	144	static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data)
	145	{
	146	struct ceph_inode_info* ci = cookie_netfs_data;
	147	struct pagevec pvec;
	148	pgoff_t first;
	149	int loop, nr_pages;
	150
	151	pagevec_init(&pvec, 0);
	152	first = 0;
	153
	154	dout("ceph inode 0x%p now uncached", ci);
	155
	156	while (1) {
	157	nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first,
	158	PAGEVEC_SIZE - pagevec_count(&pvec));
	159
	160	if (!nr_pages)
	161	break;
	162
	163	for (loop = 0; loop < nr_pages; loop++)
	164	ClearPageFsCache(pvec.pages[loop]);
	165
	166	first = pvec.pages[nr_pages - 1]->index + 1;
	167
	168	pvec.nr = nr_pages;
	169	pagevec_release(&pvec);
	170	cond_resched();
	171	}
	172	}
	173
	174	static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
	175	.name = "CEPH.inode",
	176	.type = FSCACHE_COOKIE_TYPE_DATAFILE,
	177	.get_key = ceph_fscache_inode_get_key,
	178	.get_attr = ceph_fscache_inode_get_attr,
	179	.get_aux = ceph_fscache_inode_get_aux,
	180	.check_aux = ceph_fscache_inode_check_aux,
	181	.now_uncached = ceph_fscache_inode_now_uncached,
	182	};
	183
	184	void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
	185	struct ceph_inode_info* ci)
	186	{
	187	struct inode* inode = &ci->vfs_inode;
	188
	189	/* No caching for filesystem */
	190	if (fsc->fscache == NULL)
	191	return;
	192
	193	/* Only cache for regular files that are read only */
	194	if ((ci->vfs_inode.i_mode & S_IFREG) == 0)
	195	return;
	196
	197	/* Avoid multiple racing open requests */
5955102c	198	inode_lock(inode);
99ccbd22 MT	199
	200	if (ci->fscache)
	201	goto done;
	202
	203	ci->fscache = fscache_acquire_cookie(fsc->fscache,
	204	&ceph_fscache_inode_object_def,
94d30ae9	205	ci, true);
f1fc4fee	206	fscache_check_consistency(ci->fscache);
99ccbd22	207	done:
5955102c	208	inode_unlock(inode);
99ccbd22 MT	209
	210	}
	211
	212	void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
	213	{
	214	struct fscache_cookie* cookie;
	215
	216	if ((cookie = ci->fscache) == NULL)
	217	return;
	218
	219	ci->fscache = NULL;
	220
	221	fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
	222	fscache_relinquish_cookie(cookie, 0);
	223	}
	224
	225	static void ceph_vfs_readpage_complete(struct page page, void data, int error)
	226	{
	227	if (!error)
	228	SetPageUptodate(page);
	229	}
	230
	231	static void ceph_vfs_readpage_complete_unlock(struct page page, void data, int error)
	232	{
	233	if (!error)
	234	SetPageUptodate(page);
	235
	236	unlock_page(page);
	237	}
	238
	239	static inline int cache_valid(struct ceph_inode_info *ci)
	240	{
	241	return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) &&
	242	(ci->i_fscache_gen == ci->i_rdcache_gen));
	243	}
	244
	245
	246	/* Atempt to read from the fscache,
	247	*
	248	* This function is called from the readpage_nounlock context. DO NOT attempt to
	249	* unlock the page here (or in the callback).
	250	*/
	251	int ceph_readpage_from_fscache(struct inode inode, struct page page)
	252	{
	253	struct ceph_inode_info *ci = ceph_inode(inode);
	254	int ret;
	255
	256	if (!cache_valid(ci))
	257	return -ENOBUFS;
	258
	259	ret = fscache_read_or_alloc_page(ci->fscache, page,
	260	ceph_vfs_readpage_complete, NULL,
	261	GFP_KERNEL);
	262
	263	switch (ret) {
	264	case 0: /* Page found */
	265	dout("page read submitted\n");
	266	return 0;
	267	case -ENOBUFS: /* Pages were not found, and can't be */
	268	case -ENODATA: /* Pages were not found */
	269	dout("page/inode not in cache\n");
	270	return ret;
	271	default:
	272	dout("%s: unknown error ret = %i\n", __func__, ret);
273	return ret;
274	}
275	}
276
277	int ceph_readpages_from_fscache(struct inode *inode,
278	struct address_space *mapping,
279	struct list_head *pages,
280	unsigned *nr_pages)
281	{
282	struct ceph_inode_info *ci = ceph_inode(inode);
283	int ret;
284
285	if (!cache_valid(ci))
286	return -ENOBUFS;
287
288	ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
289	ceph_vfs_readpage_complete_unlock,
290	NULL, mapping_gfp_mask(mapping));
291
292	switch (ret) {
293	case 0: /* All pages found */
294	dout("all-page read submitted\n");
295	return 0;
296	case -ENOBUFS: /* Some pages were not found, and can't be */
297	case -ENODATA: /* some pages were not found */
298	dout("page/inode not in cache\n");
299	return ret;
300	default:
301	dout("%s: unknown error ret = %i\n", __func__, ret);
302	return ret;
303	}
304	}
305
306	void ceph_readpage_to_fscache(struct inode inode, struct page page)
307	{
308	struct ceph_inode_info *ci = ceph_inode(inode);
309	int ret;
310
9b8dd1e8 MT	311	if (!PageFsCache(page))
	312	return;
	313
99ccbd22 MT	314	if (!cache_valid(ci))
	315	return;
	316
	317	ret = fscache_write_page(ci->fscache, page, GFP_KERNEL);
	318	if (ret)
	319	fscache_uncache_page(ci->fscache, page);
	320	}
	321
	322	void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
	323	{
	324	struct ceph_inode_info *ci = ceph_inode(inode);
	325
ffc79664 MT	326	if (!PageFsCache(page))
	327	return;
	328
99ccbd22 MT	329	fscache_wait_on_page_write(ci->fscache, page);
	330	fscache_uncache_page(ci->fscache, page);
	331	}
	332
	333	void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
	334	{
	335	if (fsc->revalidate_wq)
	336	destroy_workqueue(fsc->revalidate_wq);
	337
	338	fscache_relinquish_cookie(fsc->fscache, 0);
	339	fsc->fscache = NULL;
	340	}
	341
	342	static void ceph_revalidate_work(struct work_struct *work)
	343	{
	344	int issued;
	345	u32 orig_gen;
	346	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
	347	i_revalidate_work);
	348	struct inode *inode = &ci->vfs_inode;
	349
	350	spin_lock(&ci->i_ceph_lock);
	351	issued = __ceph_caps_issued(ci, NULL);
	352	orig_gen = ci->i_rdcache_gen;
	353	spin_unlock(&ci->i_ceph_lock);
	354
	355	if (!(issued & CEPH_CAP_FILE_CACHE)) {
	356	dout("revalidate_work lost cache before validation %p\n",
	357	inode);
	358	goto out;
	359	}
	360
	361	if (!fscache_check_consistency(ci->fscache))
	362	fscache_invalidate(ci->fscache);
	363
	364	spin_lock(&ci->i_ceph_lock);
	365	/* Update the new valid generation (backwards sanity check too) */
	366	if (orig_gen > ci->i_fscache_gen) {
	367	ci->i_fscache_gen = orig_gen;
	368	}
	369	spin_unlock(&ci->i_ceph_lock);
	370
	371	out:
	372	iput(&ci->vfs_inode);
	373	}
	374
	375	void ceph_queue_revalidate(struct inode *inode)
	376	{
e81568eb	377	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
99ccbd22 MT	378	struct ceph_inode_info *ci = ceph_inode(inode);
99ccbd22 MT	379
e81568eb MT	380	if (fsc->revalidate_wq == NULL \|\| ci->fscache == NULL)
	381	return;
	382
99ccbd22 MT	383	ihold(inode);
	384
	385	if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq,
	386	&ci->i_revalidate_work)) {
	387	dout("ceph_queue_revalidate %p\n", inode);
	388	} else {
	389	dout("ceph_queue_revalidate %p failed\n)", inode);
	390	iput(inode);
	391	}
	392	}
	393
	394	void ceph_fscache_inode_init(struct ceph_inode_info *ci)
	395	{
	396	ci->fscache = NULL;
	397	/* The first load is verifed cookie open time */
	398	ci->i_fscache_gen = 1;
	399	INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work);
	400	}