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