Thomas Gleixner | 1f32761 | 2019-05-28 09:57:16 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 2 | /* |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 3 | * This file contians vfs dentry ops for the 9P2000 protocol. |
| 4 | * |
| 5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/file.h> |
| 13 | #include <linux/pagemap.h> |
| 14 | #include <linux/stat.h> |
| 15 | #include <linux/string.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 16 | #include <linux/inet.h> |
| 17 | #include <linux/namei.h> |
| 18 | #include <linux/idr.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 19 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 21 | #include <net/9p/9p.h> |
| 22 | #include <net/9p/client.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 23 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 24 | #include "v9fs.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 25 | #include "v9fs_vfs.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 26 | #include "fid.h" |
| 27 | |
| 28 | /** |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 29 | * v9fs_cached_dentry_delete - called when dentry refcount equals 0 |
| 30 | * @dentry: dentry in question |
| 31 | * |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 32 | */ |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 33 | static int v9fs_cached_dentry_delete(const struct dentry *dentry) |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 34 | { |
Al Viro | 4b8e992 | 2014-08-19 20:17:38 -0400 | [diff] [blame] | 35 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", |
| 36 | dentry, dentry); |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 37 | |
Aneesh Kumar K.V | a950a65 | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 38 | /* Don't cache negative dentries */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 39 | if (d_really_is_negative(dentry)) |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 40 | return 1; |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | /** |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 45 | * v9fs_dentry_release - called when dentry is going to be freed |
| 46 | * @dentry: dentry that is being release |
| 47 | * |
| 48 | */ |
| 49 | |
Al Viro | 98cd3fb | 2011-01-12 17:10:55 -0500 | [diff] [blame] | 50 | static void v9fs_dentry_release(struct dentry *dentry) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 51 | { |
Al Viro | aaeb7ecf | 2013-02-28 01:13:19 -0500 | [diff] [blame] | 52 | struct hlist_node *p, *n; |
Dominique Martinet | 6e195b0 | 2021-11-02 22:16:43 +0900 | [diff] [blame] | 53 | |
Al Viro | 4b8e992 | 2014-08-19 20:17:38 -0400 | [diff] [blame] | 54 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", |
| 55 | dentry, dentry); |
Al Viro | aaeb7ecf | 2013-02-28 01:13:19 -0500 | [diff] [blame] | 56 | hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) |
Dominique Martinet | b48dbb9 | 2022-06-12 13:42:32 +0900 | [diff] [blame] | 57 | p9_fid_put(hlist_entry(p, struct p9_fid, dlist)); |
Al Viro | aaeb7ecf | 2013-02-28 01:13:19 -0500 | [diff] [blame] | 58 | dentry->d_fsdata = NULL; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 59 | } |
| 60 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 61 | static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 62 | { |
| 63 | struct p9_fid *fid; |
| 64 | struct inode *inode; |
| 65 | struct v9fs_inode *v9inode; |
| 66 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 67 | if (flags & LOOKUP_RCU) |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 68 | return -ECHILD; |
| 69 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 70 | inode = d_inode(dentry); |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 71 | if (!inode) |
| 72 | goto out_valid; |
| 73 | |
| 74 | v9inode = V9FS_I(inode); |
| 75 | if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) { |
| 76 | int retval; |
| 77 | struct v9fs_session_info *v9ses; |
Dominique Martinet | 6e195b0 | 2021-11-02 22:16:43 +0900 | [diff] [blame] | 78 | |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 79 | fid = v9fs_fid_lookup(dentry); |
| 80 | if (IS_ERR(fid)) |
| 81 | return PTR_ERR(fid); |
| 82 | |
| 83 | v9ses = v9fs_inode2v9ses(inode); |
| 84 | if (v9fs_proto_dotl(v9ses)) |
| 85 | retval = v9fs_refresh_inode_dotl(fid, inode); |
| 86 | else |
| 87 | retval = v9fs_refresh_inode(fid, inode); |
Dominique Martinet | b48dbb9 | 2022-06-12 13:42:32 +0900 | [diff] [blame] | 88 | p9_fid_put(fid); |
Jianyong Wu | 6636b6d | 2020-09-23 22:11:46 +0800 | [diff] [blame] | 89 | |
Aneesh Kumar K.V | f2eda2c | 2011-03-23 19:48:16 +0530 | [diff] [blame] | 90 | if (retval == -ENOENT) |
| 91 | return 0; |
| 92 | if (retval < 0) |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 93 | return retval; |
| 94 | } |
| 95 | out_valid: |
| 96 | return 1; |
| 97 | } |
| 98 | |
Al Viro | a488257c | 2009-02-20 05:55:46 +0000 | [diff] [blame] | 99 | const struct dentry_operations v9fs_cached_dentry_operations = { |
Aneesh Kumar K.V | b3cbea0 | 2011-02-28 17:04:06 +0530 | [diff] [blame] | 100 | .d_revalidate = v9fs_lookup_revalidate, |
Jeff Layton | ecf3d1f | 2013-02-20 11:19:05 -0500 | [diff] [blame] | 101 | .d_weak_revalidate = v9fs_lookup_revalidate, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 102 | .d_delete = v9fs_cached_dentry_delete, |
| 103 | .d_release = v9fs_dentry_release, |
| 104 | }; |
| 105 | |
Al Viro | a488257c | 2009-02-20 05:55:46 +0000 | [diff] [blame] | 106 | const struct dentry_operations v9fs_dentry_operations = { |
Al Viro | b26d4cd | 2013-10-25 18:47:37 -0400 | [diff] [blame] | 107 | .d_delete = always_delete_dentry, |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 108 | .d_release = v9fs_dentry_release, |
| 109 | }; |