fs/ceph/cache.c

   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->netfs.cache);
  33
  34         ci->netfs.cache =
  35                 fscache_acquire_cookie(fsc->fscache, 0,
  36                                        &ci->i_vino, sizeof(ci->i_vino),
  37                                        &ci->i_version, sizeof(ci->i_version),
  38                                        i_size_read(inode));
  39 }
  40
  41 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
  42 {
  43         fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
  44 }
  45
  46 void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
  47 {
  48         struct ceph_inode_info *ci = ceph_inode(inode);
  49
  50         fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
  51 }
  52
  53 void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
  54 {
  55         struct ceph_inode_info *ci = ceph_inode(inode);
  56
  57         if (update) {
  58                 loff_t i_size = i_size_read(inode);
  59
  60                 fscache_unuse_cookie(ceph_fscache_cookie(ci),
  61                                      &ci->i_version, &i_size);
  62         } else {
  63                 fscache_unuse_cookie(ceph_fscache_cookie(ci), 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(ceph_fscache_cookie(ci), &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_fscache_cookie(ci),
  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 }