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// 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->netfs.cache);
ci->netfs.cache =
fscache_acquire_cookie(fsc->fscache, 0,
&ci->i_vino, sizeof(ci->i_vino),
&ci->i_version, sizeof(ci->i_version),
i_size_read(inode));
if (ci->netfs.cache)
mapping_set_release_always(inode->i_mapping);
}
void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
{
fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
}
void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
{
struct ceph_inode_info *ci = ceph_inode(inode);
fscache_use_cookie(ceph_fscache_cookie(ci), 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(ceph_fscache_cookie(ci),
&ci->i_version, &i_size);
} else {
fscache_unuse_cookie(ceph_fscache_cookie(ci), 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(ceph_fscache_cookie(ci), &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_fscache_cookie(ci),
&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);
}
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