Release 4.10 fs/ceph/cache.c

Directory: fs/ceph
/*
 * 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 {
	
u64 		version;
	
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;
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 66 100.00% 1 100.00%
Total 66 100.00% 1 100.00%


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);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 14 100.00% 2 100.00%
Total 14 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 13 100.00% 2 100.00%
Total 13 100.00% 2 100.00%



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)
		pr_err("Unable to register fsid: %p fscache cookie\n", fsc);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 41 91.11% 1 25.00%
david howells david howells 2 4.44% 1 25.00%
colin king colin king 1 2.22% 1 25.00%
zhen yan zhen yan 1 2.22% 1 25.00%
Total 45 100.00% 4 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 62 98.41% 1 50.00%
geliang tang geliang tang 1 1.59% 1 50.00%
Total 63 100.00% 2 100.00%



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.version = ci->i_version;
	aux.mtime = inode->i_mtime;
	aux.size = i_size_read(inode);

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

	return sizeof(aux);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 87 88.78% 1 33.33%
zhen yan zhen yan 11 11.22% 2 66.67%
Total 98 100.00% 3 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 28 82.35% 1 50.00%
zhen yan zhen yan 6 17.65% 1 50.00%
Total 34 100.00% 2 100.00%



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.version = ci->i_version;
	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;
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 109 90.83% 1 33.33%
zhen yan zhen yan 11 9.17% 2 66.67%
Total 120 100.00% 3 100.00%



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();
	}
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 137 100.00% 1 100.00%
Total 137 100.00% 1 100.00%


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 inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);

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

	/* Only cache for regular files that are read only */
	if (!S_ISREG(inode->i_mode))
		return;

	inode_lock_nested(inode, I_MUTEX_CHILD);
	if (!ci->fscache) {
		ci->fscache = fscache_acquire_cookie(fsc->fscache,
					&ceph_fscache_inode_object_def,
					ci, false);
	}
	inode_unlock(inode);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 61 67.03% 1 25.00%
zhen yan zhen yan 28 30.77% 1 25.00%
al viro al viro 1 1.10% 1 25.00%
david howells david howells 1 1.10% 1 25.00%
Total 91 100.00% 4 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 51 100.00% 1 100.00%
Total 51 100.00% 1 100.00%



static bool ceph_fscache_can_enable(void *data)
{
	struct inode *inode = data;
	return !inode_is_open_for_write(inode);
}

Contributors
Person Tokens Prop Commits CommitProp
zhen yan zhen yan 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp)
{
	struct ceph_inode_info *ci = ceph_inode(inode);

	if (!fscache_cookie_valid(ci->fscache))
		return;

	if (inode_is_open_for_write(inode)) {
		dout("fscache_file_set_cookie %p %p disabling cache\n",
		     inode, filp);
		fscache_disable_cookie(ci->fscache, false);
		fscache_uncache_all_inode_pages(ci->fscache, inode);
	} else {
		fscache_enable_cookie(ci->fscache, ceph_fscache_can_enable,
				inode);
		if (fscache_cookie_enabled(ci->fscache)) {
			dout("fscache_file_set_cookie %p %p enabing cache\n",
			     inode, filp);
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
zhen yan zhen yan 106 100.00% 1 100.00%
Total 106 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



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

	unlock_page(page);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static inline bool cache_valid(struct ceph_inode_info *ci)
{
	return ci->i_fscache_gen == ci->i_rdcache_gen;
}


Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 20 95.24% 1 50.00%
zhang zhuoyu zhang zhuoyu 1 4.76% 1 50.00%
Total 21 100.00% 2 100.00%

/* 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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 106 100.00% 1 100.00%
Total 106 100.00% 1 100.00%



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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 122 100.00% 1 100.00%
Total 122 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 72 100.00% 2 100.00%
Total 72 100.00% 2 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 52 100.00% 2 100.00%
Total 52 100.00% 2 100.00%



void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
	fscache_relinquish_cookie(fsc->fscache, 0);
	fsc->fscache = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%

/*
 * caller should hold CEPH_CAP_FILE_{RD,CACHE}
 */


void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
{
	if (cache_valid(ci))
		return;

	/* resue i_truncate_mutex. There should be no pending
         * truncate while the caller holds CEPH_CAP_FILE_RD */
	mutex_lock(&ci->i_truncate_mutex);
	if (!cache_valid(ci)) {
		if (fscache_check_consistency(ci->fscache))
			fscache_invalidate(ci->fscache);
		spin_lock(&ci->i_ceph_lock);
		ci->i_fscache_gen = ci->i_rdcache_gen;
		spin_unlock(&ci->i_ceph_lock);
	}
	mutex_unlock(&ci->i_truncate_mutex);
}
Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 66 77.65% 1 50.00%
zhen yan zhen yan 19 22.35% 1 50.00%
Total 85 100.00% 2 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
milosz tanski milosz tanski 1295 85.65% 4 30.77%
zhen yan zhen yan 210 13.89% 4 30.77%
david howells david howells 3 0.20% 1 7.69%
al viro al viro 1 0.07% 1 7.69%
colin king colin king 1 0.07% 1 7.69%
geliang tang geliang tang 1 0.07% 1 7.69%
zhang zhuoyu zhang zhuoyu 1 0.07% 1 7.69%
Total 1512 100.00% 13 100.00%
Directory: fs/ceph

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
milosz tanski	milosz tanski	66	100.00%	1	100.00%
	Total	66	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/ceph/cache.c

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