Release 4.18 fs/cifs/fscache.c

/*
 *   fs/cifs/fscache.c - CIFS filesystem cache interface
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Author(s): Suresh Jayaraman <sjayaraman@suse.de>
 *
 *   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);
}

Contributors
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CommitProp
David Howells
182
81.61%
3
50.00%
Suresh Jayaraman
36
16.14%
1
16.67%
Joe Perches
3
1.35%
1
16.67%
Steve French
2
0.90%
1
16.67%
Total
223
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
34
80.95%
1
25.00%
David Howells
3
7.14%
1
25.00%
Joe Perches
3
7.14%
1
25.00%
Steve French
2
4.76%
1
25.00%
Total
42
100.00%
4
100.00%



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);
}

Contributors
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CommitProp
David Howells
66
55.00%
3
42.86%
Suresh Jayaraman
48
40.00%
1
14.29%
Steve French
3
2.50%
2
28.57%
Joe Perches
3
2.50%
1
14.29%
Total
120
100.00%
7
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
31
72.09%
1
20.00%
David Howells
6
13.95%
1
20.00%
Steve French
3
6.98%
2
40.00%
Joe Perches
3
6.98%
1
20.00%
Total
43
100.00%
5
100.00%



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 = timespec64_to_timespec(cifsi->vfs_inode.i_mtime);
	auxdata.last_change_time = timespec64_to_timespec(cifsi->vfs_inode.i_ctime);

	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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
105
94.59%
2
66.67%
Deepa Dinamani
6
5.41%
1
33.33%
Total
111
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
63
73.26%
2
25.00%
Jeff Layton
10
11.63%
1
12.50%
David Howells
7
8.14%
2
25.00%
Joe Perches
3
3.49%
1
12.50%
Steve French
3
3.49%
2
25.00%
Total
86
100.00%
8
100.00%



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 = timespec64_to_timespec(cifsi->vfs_inode.i_mtime);
		auxdata.last_change_time = timespec64_to_timespec(cifsi->vfs_inode.i_ctime);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
50
45.45%
1
20.00%
David Howells
49
44.55%
1
20.00%
Deepa Dinamani
6
5.45%
1
20.00%
Joe Perches
3
2.73%
1
20.00%
Steve French
2
1.82%
1
20.00%
Total
110
100.00%
5
100.00%



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;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
51
75.00%
1
20.00%
David Howells
12
17.65%
2
40.00%
Joe Perches
3
4.41%
1
20.00%
Steve French
2
2.94%
1
20.00%
Total
68
100.00%
5
100.00%



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);
}

Contributors
Person
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Commits
CommitProp
Suresh Jayaraman
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%



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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
71
76.34%
1
16.67%
David Howells
16
17.20%
2
33.33%
Joe Perches
3
3.23%
1
16.67%
Steve French
2
2.15%
1
16.67%
Jeff Layton
1
1.08%
1
16.67%
Total
93
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Suresh Jayaraman
73
93.59%
1
33.33%
Joe Perches
3
3.85%
1
33.33%
Steve French
2
2.56%
1
33.33%
Total
78
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
41
89.13%
1
33.33%
Joe Perches
3
6.52%
1
33.33%
Steve French
2
4.35%
1
33.33%
Total
46
100.00%
3
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
99
84.62%
1
33.33%
Joe Perches
12
10.26%
1
33.33%
Steve French
6
5.13%
1
33.33%
Total
117
100.00%
3
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
114
86.36%
1
33.33%
Joe Perches
12
9.09%
1
33.33%
Steve French
6
4.55%
1
33.33%
Total
132
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
53
67.09%
1
20.00%
David Howells
21
26.58%
2
40.00%
Joe Perches
3
3.80%
1
20.00%
Steve French
2
2.53%
1
20.00%
Total
79
100.00%
5
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
43
95.56%
1
50.00%
Suresh Jayaraman
2
4.44%
1
50.00%
Total
45
100.00%
2
100.00%



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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
56
91.80%
1
33.33%
Joe Perches
3
4.92%
1
33.33%
Steve French
2
3.28%
1
33.33%
Total
61
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh Jayaraman
875
56.82%
7
38.89%
David Howells
543
35.26%
5
27.78%
Joe Perches
60
3.90%
1
5.56%
Steve French
39
2.53%
2
11.11%
Deepa Dinamani
12
0.78%
1
5.56%
Jeff Layton
11
0.71%
2
11.11%
Total
1540
100.00%
18
100.00%
Directory: fs/cifs

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