linux/fs/ceph/cache.c
Jeff Layton 400e1286c0 ceph: conversion to new fscache API
Now that the fscache API has been reworked and simplified, change ceph
over to use it.

With the old API, we would only instantiate a cookie when the file was
open for reads. Change it to instantiate the cookie when the inode is
instantiated and call use/unuse when the file is opened/closed.

Also, ensure we resize the cached data on truncates, and invalidate the
cache in response to the appropriate events. This will allow us to
plumb in write support later.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20211129162907.149445-2-jlayton@kernel.org/ # v1
Link: https://lore.kernel.org/r/20211207134451.66296-2-jlayton@kernel.org/ # v2
Link: https://lore.kernel.org/r/163906984277.143852.14697110691303589000.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967188351.1823006.5065634844099079351.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021581427.640689.14128682147127509264.stgit@warthog.procyon.org.uk/ # v4
2022-01-11 22:13:01 +00:00

111 lines
2.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Ceph cache definitions.
*
* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
* Written by Milosz Tanski (milosz@adfin.com)
*/
#include <linux/ceph/ceph_debug.h>
#include <linux/fs_context.h>
#include "super.h"
#include "cache.h"
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)
return;
/* Regular files only */
if (!S_ISREG(inode->i_mode))
return;
/* Only new inodes! */
if (!(inode->i_state & I_NEW))
return;
WARN_ON_ONCE(ci->fscache);
ci->fscache = fscache_acquire_cookie(fsc->fscache, 0,
&ci->i_vino, sizeof(ci->i_vino),
&ci->i_version, sizeof(ci->i_version),
i_size_read(inode));
}
void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
{
struct fscache_cookie *cookie = ci->fscache;
fscache_relinquish_cookie(cookie, false);
}
void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
{
struct ceph_inode_info *ci = ceph_inode(inode);
fscache_use_cookie(ci->fscache, will_modify);
}
void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
{
struct ceph_inode_info *ci = ceph_inode(inode);
if (update) {
loff_t i_size = i_size_read(inode);
fscache_unuse_cookie(ci->fscache, &ci->i_version, &i_size);
} else {
fscache_unuse_cookie(ci->fscache, NULL, NULL);
}
}
void ceph_fscache_update(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
loff_t i_size = i_size_read(inode);
fscache_update_cookie(ci->fscache, &ci->i_version, &i_size);
}
void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
{
struct ceph_inode_info *ci = ceph_inode(inode);
fscache_invalidate(ceph_inode(inode)->fscache,
&ci->i_version, i_size_read(inode),
dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
}
int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
{
const struct ceph_fsid *fsid = &fsc->client->fsid;
const char *fscache_uniq = fsc->mount_options->fscache_uniq;
size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
char *name;
int err = 0;
name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
uniq_len ? fscache_uniq : "");
if (!name)
return -ENOMEM;
fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
if (IS_ERR_OR_NULL(fsc->fscache)) {
errorfc(fc, "Unable to register fscache cookie for %s", name);
err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
fsc->fscache = NULL;
}
kfree(name);
return err;
}
void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
{
fscache_relinquish_volume(fsc->fscache, NULL, false);
}