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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 ([email protected])
- */
- #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));
- }
- 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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