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Linux/fs/9p/cache.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * V9FS cache definitions.
  4  *
  5  *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
  6  */
  7 
  8 #include <linux/jiffies.h>
  9 #include <linux/file.h>
 10 #include <linux/slab.h>
 11 #include <linux/stat.h>
 12 #include <linux/sched.h>
 13 #include <linux/fs.h>
 14 #include <net/9p/9p.h>
 15 
 16 #include "v9fs.h"
 17 #include "cache.h"
 18 
 19 int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
 20                                   const char *dev_name)
 21 {
 22         struct fscache_volume *vcookie;
 23         char *name, *p;
 24 
 25         name = kasprintf(GFP_KERNEL, "9p,%s,%s",
 26                          dev_name, v9ses->cachetag ?: v9ses->aname);
 27         if (!name)
 28                 return -ENOMEM;
 29 
 30         for (p = name; *p; p++)
 31                 if (*p == '/')
 32                         *p = ';';
 33 
 34         vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
 35         p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
 36                  v9ses, vcookie, name);
 37         if (IS_ERR(vcookie)) {
 38                 if (vcookie != ERR_PTR(-EBUSY)) {
 39                         kfree(name);
 40                         return PTR_ERR(vcookie);
 41                 }
 42                 pr_err("Cache volume key already in use (%s)\n", name);
 43                 vcookie = NULL;
 44         }
 45         v9ses->fscache = vcookie;
 46         kfree(name);
 47         return 0;
 48 }
 49 
 50 void v9fs_cache_inode_get_cookie(struct inode *inode)
 51 {
 52         struct v9fs_inode *v9inode = V9FS_I(inode);
 53         struct v9fs_session_info *v9ses;
 54         __le32 version;
 55         __le64 path;
 56 
 57         if (!S_ISREG(inode->i_mode))
 58                 return;
 59         if (WARN_ON(v9fs_inode_cookie(v9inode)))
 60                 return;
 61 
 62         version = cpu_to_le32(v9inode->qid.version);
 63         path = cpu_to_le64(v9inode->qid.path);
 64         v9ses = v9fs_inode2v9ses(inode);
 65         v9inode->netfs.cache =
 66                 fscache_acquire_cookie(v9fs_session_cache(v9ses),
 67                                        0,
 68                                        &path, sizeof(path),
 69                                        &version, sizeof(version),
 70                                        i_size_read(&v9inode->netfs.inode));
 71         if (v9inode->netfs.cache)
 72                 mapping_set_release_always(inode->i_mapping);
 73 
 74         p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
 75                  inode, v9fs_inode_cookie(v9inode));
 76 }
 77 

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