[linux.git] / fs / cifs / fscache.c

/*
 *   fs/cifs/fscache.c - CIFS filesystem cache interface
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Author(s): Suresh Jayaraman <[email protected]>
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include "fscache.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

/*
 * Key layout of CIFS server cache index object
 */
struct cifs_server_key {
	struct {
		uint16_t	family;		/* address family */
		__be16		port;		/* IP port */
	} hdr;
	union {
		struct in_addr	ipv4_addr;
		struct in6_addr	ipv6_addr;
	};
} __packed;

/*
 * Get a cookie for a server object keyed by {IPaddress,port,family} tuple
 */
void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
{
	const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr;
	const struct sockaddr_in *addr = (struct sockaddr_in *) sa;
	const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa;
	struct cifs_server_key key;
	uint16_t key_len = sizeof(key.hdr);

	memset(&key, 0, sizeof(key));

	/*
	 * Should not be a problem as sin_family/sin6_family overlays
	 * sa_family field
	 */
	key.hdr.family = sa->sa_family;
	switch (sa->sa_family) {
	case AF_INET:
		key.hdr.port = addr->sin_port;
		key.ipv4_addr = addr->sin_addr;
		key_len += sizeof(key.ipv4_addr);
		break;

	case AF_INET6:
		key.hdr.port = addr6->sin6_port;
		key.ipv6_addr = addr6->sin6_addr;
		key_len += sizeof(key.ipv6_addr);
		break;

	default:
		cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
		server->fscache = NULL;
		return;
	}

	server->fscache =
		fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
				       &cifs_fscache_server_index_def,
				       &key, key_len,
				       NULL, 0,
				       server, 0, true);
	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
		 __func__, server, server->fscache);
}

void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
{
	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
		 __func__, server, server->fscache);
	fscache_relinquish_cookie(server->fscache, NULL, false);
	server->fscache = NULL;
}

void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
{
	struct TCP_Server_Info *server = tcon->ses->server;
	char *sharename;

	sharename = extract_sharename(tcon->treeName);
	if (IS_ERR(sharename)) {
		cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
		tcon->fscache = NULL;
		return;
	}

	tcon->fscache =
		fscache_acquire_cookie(server->fscache,
				       &cifs_fscache_super_index_def,
				       sharename, strlen(sharename),
				       &tcon->resource_id, sizeof(tcon->resource_id),
				       tcon, 0, true);
	kfree(sharename);
	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
		 __func__, server->fscache, tcon->fscache);
}

void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
{
	cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
	fscache_relinquish_cookie(tcon->fscache, &tcon->resource_id, false);
	tcon->fscache = NULL;
}

static void cifs_fscache_acquire_inode_cookie(struct cifsInodeInfo *cifsi,
					      struct cifs_tcon *tcon)
{
	struct cifs_fscache_inode_auxdata auxdata;

	memset(&auxdata, 0, sizeof(auxdata));
	auxdata.eof = cifsi->server_eof;
	auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
	auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
	auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
	auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;

	cifsi->fscache =
		fscache_acquire_cookie(tcon->fscache,
				       &cifs_fscache_inode_object_def,
				       &cifsi->uniqueid, sizeof(cifsi->uniqueid),
				       &auxdata, sizeof(auxdata),
				       cifsi, cifsi->vfs_inode.i_size, true);
}

static void cifs_fscache_enable_inode_cookie(struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);

	if (cifsi->fscache)
		return;

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE))
		return;

	cifs_fscache_acquire_inode_cookie(cifsi, tcon);

	cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
		 __func__, tcon->fscache, cifsi->fscache);
}

void cifs_fscache_release_inode_cookie(struct inode *inode)
{
	struct cifs_fscache_inode_auxdata auxdata;
	struct cifsInodeInfo *cifsi = CIFS_I(inode);

	if (cifsi->fscache) {
		memset(&auxdata, 0, sizeof(auxdata));
		auxdata.eof = cifsi->server_eof;
		auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
		auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
		auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
		auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;

		cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
		fscache_relinquish_cookie(cifsi->fscache, &auxdata, false);
		cifsi->fscache = NULL;
	}
}

static void cifs_fscache_disable_inode_cookie(struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);

	if (cifsi->fscache) {
		cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
		fscache_uncache_all_inode_pages(cifsi->fscache, inode);
		fscache_relinquish_cookie(cifsi->fscache, NULL, true);
		cifsi->fscache = NULL;
	}
}

void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
{
	if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
		cifs_fscache_disable_inode_cookie(inode);
	else
		cifs_fscache_enable_inode_cookie(inode);
}

void cifs_fscache_reset_inode_cookie(struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct fscache_cookie *old = cifsi->fscache;

	if (cifsi->fscache) {
		/* retire the current fscache cache and get a new one */
		fscache_relinquish_cookie(cifsi->fscache, NULL, true);

		cifs_fscache_acquire_inode_cookie(cifsi, tcon);
		cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
			 __func__, cifsi->fscache, old);
	}
}

int cifs_fscache_release_page(struct page *page, gfp_t gfp)
{
	if (PageFsCache(page)) {
		struct inode *inode = page->mapping->host;
		struct cifsInodeInfo *cifsi = CIFS_I(inode);

		cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
			 __func__, page, cifsi->fscache);
		if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
			return 0;
	}

	return 1;
}

static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx,
						int error)
{
	cifs_dbg(FYI, "%s: (0x%p/%d)\n", __func__, page, error);
	if (!error)
		SetPageUptodate(page);
	unlock_page(page);
}

/*
 * Retrieve a page from FS-Cache
 */
int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
{
	int ret;

	cifs_dbg(FYI, "%s: (fsc:%p, p:%p, i:0x%p\n",
		 __func__, CIFS_I(inode)->fscache, page, inode);
	ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
					 cifs_readpage_from_fscache_complete,
					 NULL,
					 GFP_KERNEL);
	switch (ret) {

	case 0: /* page found in fscache, read submitted */
		cifs_dbg(FYI, "%s: submitted\n", __func__);
		return ret;
	case -ENOBUFS:	/* page won't be cached */
	case -ENODATA:	/* page not in cache */
		cifs_dbg(FYI, "%s: %d\n", __func__, ret);
		return 1;

	default:
		cifs_dbg(VFS, "unknown error ret = %d\n", ret);
	}
	return ret;
}

/*
 * Retrieve a set of pages from FS-Cache
 */
int __cifs_readpages_from_fscache(struct inode *inode,
				struct address_space *mapping,
				struct list_head *pages,
				unsigned *nr_pages)
{
	int ret;

	cifs_dbg(FYI, "%s: (0x%p/%u/0x%p)\n",
		 __func__, CIFS_I(inode)->fscache, *nr_pages, inode);
	ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
					  pages, nr_pages,
					  cifs_readpage_from_fscache_complete,
					  NULL,
					  mapping_gfp_mask(mapping));
	switch (ret) {
	case 0:	/* read submitted to the cache for all pages */
		cifs_dbg(FYI, "%s: submitted\n", __func__);
		return ret;

	case -ENOBUFS:	/* some pages are not cached and can't be */
	case -ENODATA:	/* some pages are not cached */
		cifs_dbg(FYI, "%s: no page\n", __func__);
		return 1;

	default:
		cifs_dbg(FYI, "unknown error ret = %d\n", ret);
	}

	return ret;
}

void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	int ret;

	cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
		 __func__, cifsi->fscache, page, inode);
	ret = fscache_write_page(cifsi->fscache, page,
				 cifsi->vfs_inode.i_size, GFP_KERNEL);
	if (ret != 0)
		fscache_uncache_page(cifsi->fscache, page);
}

void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages)
{
	cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
		 __func__, CIFS_I(inode)->fscache, inode);
	fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
}

void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	struct fscache_cookie *cookie = cifsi->fscache;

	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
	fscache_wait_on_page_write(cookie, page);
	fscache_uncache_page(cookie, page);
}
Commit	Line	Data
488f1d2d SJ	1	/*
	2	* fs/cifs/fscache.c - CIFS filesystem cache interface
	3	*
	4	* Copyright (c) 2010 Novell, Inc.
b81209de	5	* Author(s): Suresh Jayaraman <[email protected]>
488f1d2d SJ	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21	#include "fscache.h"
	22	#include "cifsglob.h"
	23	#include "cifs_debug.h"
9451a9a5	24	#include "cifs_fs_sb.h"
488f1d2d	25
402cb8dd DH	26	/*
	27	* Key layout of CIFS server cache index object
	28	*/
	29	struct cifs_server_key {
	30	struct {
	31	uint16_t family; /* address family */
	32	__be16 port; /* IP port */
	33	} hdr;
	34	union {
	35	struct in_addr ipv4_addr;
	36	struct in6_addr ipv6_addr;
	37	};
	38	} __packed;
	39
	40	/*
	41	* Get a cookie for a server object keyed by {IPaddress,port,family} tuple
	42	*/
488f1d2d SJ	43	void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
488f1d2d SJ	44	{
402cb8dd DH	45	const struct sockaddr sa = (struct sockaddr ) &server->dstaddr;
	46	const struct sockaddr_in addr = (struct sockaddr_in ) sa;
	47	const struct sockaddr_in6 addr6 = (struct sockaddr_in6 ) sa;
	48	struct cifs_server_key key;
	49	uint16_t key_len = sizeof(key.hdr);
	50
	51	memset(&key, 0, sizeof(key));
	52
	53	/*
	54	* Should not be a problem as sin_family/sin6_family overlays
	55	* sa_family field
	56	*/
	57	key.hdr.family = sa->sa_family;
	58	switch (sa->sa_family) {
	59	case AF_INET:
	60	key.hdr.port = addr->sin_port;
	61	key.ipv4_addr = addr->sin_addr;
	62	key_len += sizeof(key.ipv4_addr);
	63	break;
	64
	65	case AF_INET6:
	66	key.hdr.port = addr6->sin6_port;
	67	key.ipv6_addr = addr6->sin6_addr;
	68	key_len += sizeof(key.ipv6_addr);
	69	break;
	70
	71	default:
	72	cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
	73	server->fscache = NULL;
	74	return;
	75	}
	76
488f1d2d SJ	77	server->fscache =
488f1d2d SJ	78	fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
402cb8dd DH	79	&cifs_fscache_server_index_def,
	80	&key, key_len,
	81	NULL, 0,
ee1235a9	82	server, 0, true);
f96637be JP	83	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
f96637be JP	84	__func__, server, server->fscache);
488f1d2d SJ	85	}
	86
	87	void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
	88	{
f96637be JP	89	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
f96637be JP	90	__func__, server, server->fscache);
402cb8dd	91	fscache_relinquish_cookie(server->fscache, NULL, false);
488f1d2d SJ	92	server->fscache = NULL;
	93	}
	94
96daf2b0	95	void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
d03382ce SJ	96	{
d03382ce SJ	97	struct TCP_Server_Info *server = tcon->ses->server;
402cb8dd DH	98	char *sharename;
	99
	100	sharename = extract_sharename(tcon->treeName);
	101	if (IS_ERR(sharename)) {
	102	cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
	103	tcon->fscache = NULL;
	104	return;
	105	}
d03382ce SJ	106
	107	tcon->fscache =
	108	fscache_acquire_cookie(server->fscache,
402cb8dd DH	109	&cifs_fscache_super_index_def,
	110	sharename, strlen(sharename),
	111	&tcon->resource_id, sizeof(tcon->resource_id),
ee1235a9	112	tcon, 0, true);
402cb8dd	113	kfree(sharename);
f96637be JP	114	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
f96637be JP	115	__func__, server->fscache, tcon->fscache);
d03382ce SJ	116	}
d03382ce SJ	117
96daf2b0	118	void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
d03382ce	119	{
f96637be	120	cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
402cb8dd	121	fscache_relinquish_cookie(tcon->fscache, &tcon->resource_id, false);
d03382ce SJ	122	tcon->fscache = NULL;
d03382ce SJ	123	}
9451a9a5	124
402cb8dd DH	125	static void cifs_fscache_acquire_inode_cookie(struct cifsInodeInfo *cifsi,
	126	struct cifs_tcon *tcon)
	127	{
	128	struct cifs_fscache_inode_auxdata auxdata;
	129
	130	memset(&auxdata, 0, sizeof(auxdata));
	131	auxdata.eof = cifsi->server_eof;
cbedeadf AB	132	auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
	133	auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
	134	auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
	135	auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
402cb8dd DH	136
	137	cifsi->fscache =
	138	fscache_acquire_cookie(tcon->fscache,
	139	&cifs_fscache_inode_object_def,
	140	&cifsi->uniqueid, sizeof(cifsi->uniqueid),
	141	&auxdata, sizeof(auxdata),
ee1235a9	142	cifsi, cifsi->vfs_inode.i_size, true);
402cb8dd DH	143	}
402cb8dd DH	144
9451a9a5 SJ	145	static void cifs_fscache_enable_inode_cookie(struct inode *inode)
	146	{
	147	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	148	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
96daf2b0	149	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
9451a9a5 SJ	150
	151	if (cifsi->fscache)
	152	return;
	153
402cb8dd DH	154	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE))
	155	return;
	156
	157	cifs_fscache_acquire_inode_cookie(cifsi, tcon);
	158
	159	cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
	160	__func__, tcon->fscache, cifsi->fscache);
9451a9a5 SJ	161	}
	162
	163	void cifs_fscache_release_inode_cookie(struct inode *inode)
	164	{
402cb8dd	165	struct cifs_fscache_inode_auxdata auxdata;
9451a9a5 SJ	166	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	167
	168	if (cifsi->fscache) {
402cb8dd DH	169	memset(&auxdata, 0, sizeof(auxdata));
402cb8dd DH	170	auxdata.eof = cifsi->server_eof;
cbedeadf AB	171	auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
	172	auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
	173	auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
	174	auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
402cb8dd	175
f96637be	176	cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
402cb8dd	177	fscache_relinquish_cookie(cifsi->fscache, &auxdata, false);
9451a9a5 SJ	178	cifsi->fscache = NULL;
	179	}
	180	}
	181
	182	static void cifs_fscache_disable_inode_cookie(struct inode *inode)
	183	{
	184	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	185
	186	if (cifsi->fscache) {
f96637be	187	cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
c902ce1b	188	fscache_uncache_all_inode_pages(cifsi->fscache, inode);
402cb8dd	189	fscache_relinquish_cookie(cifsi->fscache, NULL, true);
9451a9a5 SJ	190	cifsi->fscache = NULL;
	191	}
	192	}
	193
	194	void cifs_fscache_set_inode_cookie(struct inode inode, struct file filp)
	195	{
	196	if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
	197	cifs_fscache_disable_inode_cookie(inode);
b81209de	198	else
9451a9a5	199	cifs_fscache_enable_inode_cookie(inode);
9451a9a5 SJ	200	}
	201
	202	void cifs_fscache_reset_inode_cookie(struct inode *inode)
	203	{
	204	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	205	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
402cb8dd	206	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
9451a9a5 SJ	207	struct fscache_cookie *old = cifsi->fscache;
	208
	209	if (cifsi->fscache) {
	210	/* retire the current fscache cache and get a new one */
402cb8dd	211	fscache_relinquish_cookie(cifsi->fscache, NULL, true);
9451a9a5	212
402cb8dd	213	cifs_fscache_acquire_inode_cookie(cifsi, tcon);
f96637be JP	214	cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
f96637be JP	215	__func__, cifsi->fscache, old);
9451a9a5 SJ	216	}
9451a9a5 SJ	217	}
85f2d6b4 SJ	218
	219	int cifs_fscache_release_page(struct page *page, gfp_t gfp)
	220	{
	221	if (PageFsCache(page)) {
	222	struct inode *inode = page->mapping->host;
	223	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	224
f96637be JP	225	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
f96637be JP	226	__func__, page, cifsi->fscache);
85f2d6b4 SJ	227	if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
	228	return 0;
	229	}
	230
	231	return 1;
	232	}
	233
56698236 SJ	234	static void cifs_readpage_from_fscache_complete(struct page page, void ctx,
	235	int error)
	236	{
f96637be	237	cifs_dbg(FYI, "%s: (0x%p/%d)\n", __func__, page, error);
56698236 SJ	238	if (!error)
	239	SetPageUptodate(page);
	240	unlock_page(page);
	241	}
	242
	243	/*
	244	* Retrieve a page from FS-Cache
	245	*/
	246	int __cifs_readpage_from_fscache(struct inode inode, struct page page)
	247	{
	248	int ret;
	249
f96637be JP	250	cifs_dbg(FYI, "%s: (fsc:%p, p:%p, i:0x%p\n",
f96637be JP	251	__func__, CIFS_I(inode)->fscache, page, inode);
56698236 SJ	252	ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
	253	cifs_readpage_from_fscache_complete,
	254	NULL,
	255	GFP_KERNEL);
	256	switch (ret) {
	257
	258	case 0: /* page found in fscache, read submitted */
f96637be	259	cifs_dbg(FYI, "%s: submitted\n", __func__);
56698236 SJ	260	return ret;
	261	case -ENOBUFS: /* page won't be cached */
	262	case -ENODATA: /* page not in cache */
f96637be	263	cifs_dbg(FYI, "%s: %d\n", __func__, ret);
56698236 SJ	264	return 1;
	265
	266	default:
f96637be	267	cifs_dbg(VFS, "unknown error ret = %d\n", ret);
56698236 SJ	268	}
	269	return ret;
	270	}
	271
	272	/*
	273	* Retrieve a set of pages from FS-Cache
	274	*/
	275	int __cifs_readpages_from_fscache(struct inode *inode,
	276	struct address_space *mapping,
	277	struct list_head *pages,
	278	unsigned *nr_pages)
	279	{
	280	int ret;
	281
f96637be JP	282	cifs_dbg(FYI, "%s: (0x%p/%u/0x%p)\n",
f96637be JP	283	__func__, CIFS_I(inode)->fscache, *nr_pages, inode);
56698236 SJ	284	ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
	285	pages, nr_pages,
	286	cifs_readpage_from_fscache_complete,
	287	NULL,
	288	mapping_gfp_mask(mapping));
	289	switch (ret) {
	290	case 0: /* read submitted to the cache for all pages */
f96637be	291	cifs_dbg(FYI, "%s: submitted\n", __func__);
56698236 SJ	292	return ret;
	293
	294	case -ENOBUFS: /* some pages are not cached and can't be */
	295	case -ENODATA: /* some pages are not cached */
f96637be	296	cifs_dbg(FYI, "%s: no page\n", __func__);
56698236 SJ	297	return 1;
	298
	299	default:
f96637be	300	cifs_dbg(FYI, "unknown error ret = %d\n", ret);
56698236 SJ	301	}
	302
	303	return ret;
	304	}
	305
9dc06558 SJ	306	void __cifs_readpage_to_fscache(struct inode inode, struct page page)
9dc06558 SJ	307	{
ee1235a9	308	struct cifsInodeInfo *cifsi = CIFS_I(inode);
9dc06558 SJ	309	int ret;
9dc06558 SJ	310
f96637be	311	cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
ee1235a9 DH	312	__func__, cifsi->fscache, page, inode);
	313	ret = fscache_write_page(cifsi->fscache, page,
	314	cifsi->vfs_inode.i_size, GFP_KERNEL);
9dc06558	315	if (ret != 0)
ee1235a9	316	fscache_uncache_page(cifsi->fscache, page);
9dc06558 SJ	317	}
9dc06558 SJ	318
54afa990 DH	319	void __cifs_fscache_readpages_cancel(struct inode inode, struct list_head pages)
	320	{
	321	cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
	322	__func__, CIFS_I(inode)->fscache, inode);
	323	fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
	324	}
	325
85f2d6b4 SJ	326	void __cifs_fscache_invalidate_page(struct page page, struct inode inode)
	327	{
	328	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	329	struct fscache_cookie *cookie = cifsi->fscache;
	330
f96637be	331	cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
85f2d6b4 SJ	332	fscache_wait_on_page_write(cookie, page);
	333	fscache_uncache_page(cookie, page);
	334	}