113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Ceph cache definitions.
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*
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* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
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* Written by Milosz Tanski (milosz@adfin.com)
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*/
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#include <linux/ceph/ceph_debug.h>
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#include <linux/fs_context.h>
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#include "super.h"
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#include "cache.h"
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void ceph_fscache_register_inode_cookie(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
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/* No caching for filesystem? */
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if (!fsc->fscache)
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return;
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/* Regular files only */
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if (!S_ISREG(inode->i_mode))
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return;
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/* Only new inodes! */
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if (!(inode->i_state & I_NEW))
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return;
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WARN_ON_ONCE(ci->netfs.cache);
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ci->netfs.cache =
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fscache_acquire_cookie(fsc->fscache, 0,
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&ci->i_vino, sizeof(ci->i_vino),
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&ci->i_version, sizeof(ci->i_version),
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i_size_read(inode));
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if (ci->netfs.cache)
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mapping_set_release_always(inode->i_mapping);
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}
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
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{
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fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
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}
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void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
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}
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void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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if (update) {
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loff_t i_size = i_size_read(inode);
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fscache_unuse_cookie(ceph_fscache_cookie(ci),
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&ci->i_version, &i_size);
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} else {
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fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
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}
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}
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void ceph_fscache_update(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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loff_t i_size = i_size_read(inode);
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fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
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}
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void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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fscache_invalidate(ceph_fscache_cookie(ci),
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&ci->i_version, i_size_read(inode),
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dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
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}
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int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
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{
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const struct ceph_fsid *fsid = &fsc->client->fsid;
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const char *fscache_uniq = fsc->mount_options->fscache_uniq;
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size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
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char *name;
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int err = 0;
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name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
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uniq_len ? fscache_uniq : "");
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if (!name)
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return -ENOMEM;
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fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
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if (IS_ERR_OR_NULL(fsc->fscache)) {
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errorfc(fc, "Unable to register fscache cookie for %s", name);
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err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
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fsc->fscache = NULL;
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}
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kfree(name);
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return err;
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}
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void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
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{
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fscache_relinquish_volume(fsc->fscache, NULL, false);
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}
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