1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Ceph cache definitions. 4 * 5 * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. 6 * Written by Milosz Tanski (milosz@adfin.com) 7 */ 8 9 #include <linux/ceph/ceph_debug.h> 10 11 #include <linux/fs_context.h> 12 #include "super.h" 13 #include "cache.h" 14 15 void ceph_fscache_register_inode_cookie(struct inode *inode) 16 { 17 struct ceph_inode_info *ci = ceph_inode(inode); 18 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 19 20 /* No caching for filesystem? */ 21 if (!fsc->fscache) 22 return; 23 24 /* Regular files only */ 25 if (!S_ISREG(inode->i_mode)) 26 return; 27 28 /* Only new inodes! */ 29 if (!(inode->i_state & I_NEW)) 30 return; 31 32 WARN_ON_ONCE(ci->fscache); 33 34 ci->fscache = fscache_acquire_cookie(fsc->fscache, 0, 35 &ci->i_vino, sizeof(ci->i_vino), 36 &ci->i_version, sizeof(ci->i_version), 37 i_size_read(inode)); 38 } 39 40 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) 41 { 42 struct fscache_cookie *cookie = ci->fscache; 43 44 fscache_relinquish_cookie(cookie, false); 45 } 46 47 void ceph_fscache_use_cookie(struct inode *inode, bool will_modify) 48 { 49 struct ceph_inode_info *ci = ceph_inode(inode); 50 51 fscache_use_cookie(ci->fscache, will_modify); 52 } 53 54 void ceph_fscache_unuse_cookie(struct inode *inode, bool update) 55 { 56 struct ceph_inode_info *ci = ceph_inode(inode); 57 58 if (update) { 59 loff_t i_size = i_size_read(inode); 60 61 fscache_unuse_cookie(ci->fscache, &ci->i_version, &i_size); 62 } else { 63 fscache_unuse_cookie(ci->fscache, NULL, NULL); 64 } 65 } 66 67 void ceph_fscache_update(struct inode *inode) 68 { 69 struct ceph_inode_info *ci = ceph_inode(inode); 70 loff_t i_size = i_size_read(inode); 71 72 fscache_update_cookie(ci->fscache, &ci->i_version, &i_size); 73 } 74 75 void ceph_fscache_invalidate(struct inode *inode, bool dio_write) 76 { 77 struct ceph_inode_info *ci = ceph_inode(inode); 78 79 fscache_invalidate(ceph_inode(inode)->fscache, 80 &ci->i_version, i_size_read(inode), 81 dio_write ? FSCACHE_INVAL_DIO_WRITE : 0); 82 } 83 84 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc) 85 { 86 const struct ceph_fsid *fsid = &fsc->client->fsid; 87 const char *fscache_uniq = fsc->mount_options->fscache_uniq; 88 size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0; 89 char *name; 90 int err = 0; 91 92 name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "", 93 uniq_len ? fscache_uniq : ""); 94 if (!name) 95 return -ENOMEM; 96 97 fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0); 98 if (IS_ERR_OR_NULL(fsc->fscache)) { 99 errorfc(fc, "Unable to register fscache cookie for %s", name); 100 err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP; 101 fsc->fscache = NULL; 102 } 103 kfree(name); 104 return err; 105 } 106 107 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) 108 { 109 fscache_relinquish_volume(fsc->fscache, NULL, false); 110 } 111