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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/* cnode related routines for the coda kernel code
3 (C) 1996 Peter Braam
4 */
5
6#include <linux/types.h>
7#include <linux/string.h>
8#include <linux/time.h>
9
10#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/coda_psdev.h>
Al Viro21fc61c2015-11-17 01:07:57 -050012#include <linux/pagemap.h>
Al Viro31a203d2011-01-12 16:36:09 -050013#include "coda_linux.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
16{
17 return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
18}
19
Arjan van de Ven754661f2007-02-12 00:55:38 -080020static const struct inode_operations coda_symlink_inode_operations = {
Al Viro6b255392015-11-17 10:20:54 -050021 .get_link = page_get_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 .setattr = coda_setattr,
23};
24
25/* cnode.c */
26static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
27{
28 coda_vattr_to_iattr(inode, attr);
29
30 if (S_ISREG(inode->i_mode)) {
31 inode->i_op = &coda_file_inode_operations;
32 inode->i_fop = &coda_file_operations;
33 } else if (S_ISDIR(inode->i_mode)) {
34 inode->i_op = &coda_dir_inode_operations;
35 inode->i_fop = &coda_dir_operations;
36 } else if (S_ISLNK(inode->i_mode)) {
37 inode->i_op = &coda_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -050038 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 inode->i_data.a_ops = &coda_symlink_aops;
40 inode->i_mapping = &inode->i_data;
41 } else
42 init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
43}
44
45static int coda_test_inode(struct inode *inode, void *data)
46{
47 struct CodaFid *fid = (struct CodaFid *)data;
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040048 struct coda_inode_info *cii = ITOC(inode);
49 return coda_fideq(&cii->c_fid, fid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050}
51
52static int coda_set_inode(struct inode *inode, void *data)
53{
54 struct CodaFid *fid = (struct CodaFid *)data;
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040055 struct coda_inode_info *cii = ITOC(inode);
56 cii->c_fid = *fid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return 0;
58}
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
61 struct coda_vattr * attr)
62{
63 struct inode *inode;
64 struct coda_inode_info *cii;
65 unsigned long hash = coda_f2i(fid);
66
67 inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
68
69 if (!inode)
70 return ERR_PTR(-ENOMEM);
71
72 if (inode->i_state & I_NEW) {
73 cii = ITOC(inode);
74 /* we still need to set i_ino for things like stat(2) */
75 inode->i_ino = hash;
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040076 /* inode is locked and unique, no need to grab cii->c_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 cii->c_mapcount = 0;
78 unlock_new_inode(inode);
79 }
80
81 /* always replace the attributes, type might have changed */
82 coda_fill_inode(inode, attr);
83 return inode;
84}
85
86/* this is effectively coda_iget:
87 - get attributes (might be cached)
88 - get the inode for the fid using vfs iget
89 - link the two up if this is needed
90 - fill in the attributes
91*/
Al Virof4947fb2012-01-10 11:11:49 -050092struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 struct coda_vattr attr;
Al Virof4947fb2012-01-10 11:11:49 -050095 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 int error;
97
98 /* We get inode numbers from Venus -- see venus source */
99 error = venus_getattr(sb, fid, &attr);
Al Virof4947fb2012-01-10 11:11:49 -0500100 if (error)
101 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Al Virof4947fb2012-01-10 11:11:49 -0500103 inode = coda_iget(sb, fid, &attr);
104 if (IS_ERR(inode))
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700105 pr_warn("%s: coda_iget failed\n", __func__);
Al Virof4947fb2012-01-10 11:11:49 -0500106 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
109
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400110/* Although we treat Coda file identifiers as immutable, there is one
111 * special case for files created during a disconnection where they may
112 * not be globally unique. When an identifier collision is detected we
113 * first try to flush the cached inode from the kernel and finally
114 * resort to renaming/rehashing in-place. Userspace remembers both old
115 * and new values of the identifier to handle any in-flight upcalls.
116 * The real solution is to use globally unique UUIDs as identifiers, but
117 * retrofitting the existing userspace code for this is non-trivial. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
119 struct CodaFid *newfid)
120{
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400121 struct coda_inode_info *cii = ITOC(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 unsigned long hash = coda_f2i(newfid);
123
Eric Sesterhennc5d32372006-03-24 18:42:13 +0100124 BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /* replace fid and rehash inode */
127 /* XXX we probably need to hold some lock here! */
128 remove_inode_hash(inode);
129 cii->c_fid = *newfid;
130 inode->i_ino = hash;
131 __insert_inode_hash(inode, hash);
132}
133
134/* convert a fid to an inode. */
135struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
136{
137 struct inode *inode;
138 unsigned long hash = coda_f2i(fid);
139
140 if ( !sb ) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700141 pr_warn("%s: no sb!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return NULL;
143 }
144
Jan Harkesed31a7d2007-07-19 01:48:44 -0700145 inode = ilookup5(sb, hash, coda_test_inode, fid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if ( !inode )
147 return NULL;
148
149 /* we should never see newly created inodes because we intentionally
150 * fail in the initialization callback */
151 BUG_ON(inode->i_state & I_NEW);
152
153 return inode;
154}
155
156/* the CONTROL inode is made without asking attributes from Venus */
Al Viro0b2c4e32012-01-10 10:46:03 -0500157struct inode *coda_cnode_makectl(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Al Viro0b2c4e32012-01-10 10:46:03 -0500159 struct inode *inode = new_inode(sb);
160 if (inode) {
161 inode->i_ino = CTL_INO;
162 inode->i_op = &coda_ioctl_inode_operations;
163 inode->i_fop = &coda_ioctl_operations;
164 inode->i_mode = 0444;
165 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
Al Viro0b2c4e32012-01-10 10:46:03 -0500167 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169