1 |
1275 |
phoenix |
/*
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2 |
|
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* linux/fs/nfs/inode.c
|
3 |
|
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*
|
4 |
|
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* Copyright (C) 1992 Rick Sladkey
|
5 |
|
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*
|
6 |
|
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* nfs inode and superblock handling functions
|
7 |
|
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*
|
8 |
|
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* Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
|
9 |
|
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* experimental NFS changes. Modularisation taken straight from SYS5 fs.
|
10 |
|
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*
|
11 |
|
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* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
|
12 |
|
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* J.S.Peatfield@damtp.cam.ac.uk
|
13 |
|
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*
|
14 |
|
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*/
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15 |
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16 |
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#include <linux/config.h>
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17 |
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#include <linux/module.h>
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18 |
|
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#include <linux/init.h>
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19 |
|
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20 |
|
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#include <linux/sched.h>
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21 |
|
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#include <linux/kernel.h>
|
22 |
|
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#include <linux/mm.h>
|
23 |
|
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#include <linux/string.h>
|
24 |
|
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#include <linux/stat.h>
|
25 |
|
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#include <linux/errno.h>
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26 |
|
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#include <linux/locks.h>
|
27 |
|
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#include <linux/unistd.h>
|
28 |
|
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#include <linux/sunrpc/clnt.h>
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29 |
|
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#include <linux/sunrpc/stats.h>
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30 |
|
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#include <linux/nfs_fs.h>
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31 |
|
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#include <linux/nfs_mount.h>
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32 |
|
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#include <linux/nfs_flushd.h>
|
33 |
|
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#include <linux/lockd/bind.h>
|
34 |
|
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#include <linux/smp_lock.h>
|
35 |
|
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#include <linux/seq_file.h>
|
36 |
|
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|
37 |
|
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#include <asm/system.h>
|
38 |
|
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#include <asm/uaccess.h>
|
39 |
|
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|
40 |
|
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#define CONFIG_NFS_SNAPSHOT 1
|
41 |
|
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#define NFSDBG_FACILITY NFSDBG_VFS
|
42 |
|
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#define NFS_PARANOIA 1
|
43 |
|
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|
44 |
|
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static struct inode * __nfs_fhget(struct super_block *, struct nfs_fh *, struct nfs_fattr *);
|
45 |
|
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void nfs_zap_caches(struct inode *);
|
46 |
|
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static void nfs_invalidate_inode(struct inode *);
|
47 |
|
|
|
48 |
|
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static void nfs_read_inode(struct inode *);
|
49 |
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static void nfs_write_inode(struct inode *,int);
|
50 |
|
|
static void nfs_delete_inode(struct inode *);
|
51 |
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static void nfs_put_super(struct super_block *);
|
52 |
|
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static void nfs_clear_inode(struct inode *);
|
53 |
|
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static void nfs_umount_begin(struct super_block *);
|
54 |
|
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static int nfs_statfs(struct super_block *, struct statfs *);
|
55 |
|
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static int nfs_show_options(struct seq_file *, struct vfsmount *);
|
56 |
|
|
|
57 |
|
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static struct super_operations nfs_sops = {
|
58 |
|
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read_inode: nfs_read_inode,
|
59 |
|
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write_inode: nfs_write_inode,
|
60 |
|
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delete_inode: nfs_delete_inode,
|
61 |
|
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put_super: nfs_put_super,
|
62 |
|
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statfs: nfs_statfs,
|
63 |
|
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clear_inode: nfs_clear_inode,
|
64 |
|
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umount_begin: nfs_umount_begin,
|
65 |
|
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show_options: nfs_show_options,
|
66 |
|
|
};
|
67 |
|
|
|
68 |
|
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/*
|
69 |
|
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* RPC cruft for NFS
|
70 |
|
|
*/
|
71 |
|
|
struct rpc_stat nfs_rpcstat = { &nfs_program };
|
72 |
|
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static struct rpc_version * nfs_version[] = {
|
73 |
|
|
NULL,
|
74 |
|
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NULL,
|
75 |
|
|
&nfs_version2,
|
76 |
|
|
#ifdef CONFIG_NFS_V3
|
77 |
|
|
&nfs_version3,
|
78 |
|
|
#endif
|
79 |
|
|
};
|
80 |
|
|
|
81 |
|
|
struct rpc_program nfs_program = {
|
82 |
|
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"nfs",
|
83 |
|
|
NFS_PROGRAM,
|
84 |
|
|
sizeof(nfs_version) / sizeof(nfs_version[0]),
|
85 |
|
|
nfs_version,
|
86 |
|
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&nfs_rpcstat,
|
87 |
|
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};
|
88 |
|
|
|
89 |
|
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static inline unsigned long
|
90 |
|
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nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
|
91 |
|
|
{
|
92 |
|
|
return nfs_fileid_to_ino_t(fattr->fileid);
|
93 |
|
|
}
|
94 |
|
|
|
95 |
|
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/*
|
96 |
|
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* The "read_inode" function doesn't actually do anything:
|
97 |
|
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* the real data is filled in later in nfs_fhget. Here we
|
98 |
|
|
* just mark the cache times invalid, and zero out i_mode
|
99 |
|
|
* (the latter makes "nfs_refresh_inode" do the right thing
|
100 |
|
|
* wrt pipe inodes)
|
101 |
|
|
*/
|
102 |
|
|
static void
|
103 |
|
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nfs_read_inode(struct inode * inode)
|
104 |
|
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{
|
105 |
|
|
inode->i_blksize = inode->i_sb->s_blocksize;
|
106 |
|
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inode->i_mode = 0;
|
107 |
|
|
inode->i_rdev = 0;
|
108 |
|
|
/* We can't support UPDATE_ATIME(), since the server will reset it */
|
109 |
|
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inode->i_flags |= S_NOATIME;
|
110 |
|
|
INIT_LIST_HEAD(&inode->u.nfs_i.read);
|
111 |
|
|
INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
|
112 |
|
|
INIT_LIST_HEAD(&inode->u.nfs_i.commit);
|
113 |
|
|
INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
|
114 |
|
|
NFS_CACHEINV(inode);
|
115 |
|
|
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
|
116 |
|
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NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
|
117 |
|
|
}
|
118 |
|
|
|
119 |
|
|
static void
|
120 |
|
|
nfs_write_inode(struct inode *inode, int sync)
|
121 |
|
|
{
|
122 |
|
|
int flags = sync ? FLUSH_WAIT : 0;
|
123 |
|
|
|
124 |
|
|
nfs_sync_file(inode, 0, 0, flags);
|
125 |
|
|
}
|
126 |
|
|
|
127 |
|
|
static void
|
128 |
|
|
nfs_delete_inode(struct inode * inode)
|
129 |
|
|
{
|
130 |
|
|
dprintk("NFS: delete_inode(%x/%ld)\n", inode->i_dev, inode->i_ino);
|
131 |
|
|
|
132 |
|
|
/*
|
133 |
|
|
* The following can never actually happen...
|
134 |
|
|
*/
|
135 |
|
|
if (nfs_have_writebacks(inode) || nfs_have_read(inode)) {
|
136 |
|
|
printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
|
137 |
|
|
}
|
138 |
|
|
|
139 |
|
|
clear_inode(inode);
|
140 |
|
|
}
|
141 |
|
|
|
142 |
|
|
/*
|
143 |
|
|
* For the moment, the only task for the NFS clear_inode method is to
|
144 |
|
|
* release the mmap credential
|
145 |
|
|
*/
|
146 |
|
|
static void
|
147 |
|
|
nfs_clear_inode(struct inode *inode)
|
148 |
|
|
{
|
149 |
|
|
struct rpc_cred *cred = NFS_I(inode)->mm_cred;
|
150 |
|
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|
151 |
|
|
if (cred)
|
152 |
|
|
put_rpccred(cred);
|
153 |
|
|
}
|
154 |
|
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|
155 |
|
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void
|
156 |
|
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nfs_put_super(struct super_block *sb)
|
157 |
|
|
{
|
158 |
|
|
struct nfs_server *server = &sb->u.nfs_sb.s_server;
|
159 |
|
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struct rpc_clnt *rpc;
|
160 |
|
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|
161 |
|
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/*
|
162 |
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* First get rid of the request flushing daemon.
|
163 |
|
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* Relies on rpc_shutdown_client() waiting on all
|
164 |
|
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* client tasks to finish.
|
165 |
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|
*/
|
166 |
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nfs_reqlist_exit(server);
|
167 |
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|
168 |
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if ((rpc = server->client) != NULL)
|
169 |
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rpc_shutdown_client(rpc);
|
170 |
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|
171 |
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nfs_reqlist_free(server);
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172 |
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|
173 |
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if (!(server->flags & NFS_MOUNT_NONLM))
|
174 |
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lockd_down(); /* release rpc.lockd */
|
175 |
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rpciod_down(); /* release rpciod */
|
176 |
|
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|
177 |
|
|
kfree(server->hostname);
|
178 |
|
|
}
|
179 |
|
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|
180 |
|
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void
|
181 |
|
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nfs_umount_begin(struct super_block *sb)
|
182 |
|
|
{
|
183 |
|
|
struct nfs_server *server = &sb->u.nfs_sb.s_server;
|
184 |
|
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struct rpc_clnt *rpc;
|
185 |
|
|
|
186 |
|
|
/* -EIO all pending I/O */
|
187 |
|
|
if ((rpc = server->client) != NULL)
|
188 |
|
|
rpc_killall_tasks(rpc);
|
189 |
|
|
}
|
190 |
|
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|
191 |
|
|
|
192 |
|
|
static inline unsigned long
|
193 |
|
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nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
|
194 |
|
|
{
|
195 |
|
|
/* make sure blocksize is a power of two */
|
196 |
|
|
if ((bsize & (bsize - 1)) || nrbitsp) {
|
197 |
|
|
unsigned char nrbits;
|
198 |
|
|
|
199 |
|
|
for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
|
200 |
|
|
;
|
201 |
|
|
bsize = 1 << nrbits;
|
202 |
|
|
if (nrbitsp)
|
203 |
|
|
*nrbitsp = nrbits;
|
204 |
|
|
}
|
205 |
|
|
|
206 |
|
|
return bsize;
|
207 |
|
|
}
|
208 |
|
|
|
209 |
|
|
/*
|
210 |
|
|
* Calculate the number of 512byte blocks used.
|
211 |
|
|
*/
|
212 |
|
|
static inline unsigned long
|
213 |
|
|
nfs_calc_block_size(u64 tsize)
|
214 |
|
|
{
|
215 |
|
|
loff_t used = (tsize + 511) >> 9;
|
216 |
|
|
return (used > ULONG_MAX) ? ULONG_MAX : used;
|
217 |
|
|
}
|
218 |
|
|
|
219 |
|
|
/*
|
220 |
|
|
* Compute and set NFS server blocksize
|
221 |
|
|
*/
|
222 |
|
|
static inline unsigned long
|
223 |
|
|
nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
|
224 |
|
|
{
|
225 |
|
|
if (bsize < 1024)
|
226 |
|
|
bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
|
227 |
|
|
else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
|
228 |
|
|
bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
|
229 |
|
|
|
230 |
|
|
return nfs_block_bits(bsize, nrbitsp);
|
231 |
|
|
}
|
232 |
|
|
|
233 |
|
|
/*
|
234 |
|
|
* Obtain the root inode of the file system.
|
235 |
|
|
*/
|
236 |
|
|
static struct inode *
|
237 |
|
|
nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh)
|
238 |
|
|
{
|
239 |
|
|
struct nfs_server *server = &sb->u.nfs_sb.s_server;
|
240 |
|
|
struct nfs_fattr fattr;
|
241 |
|
|
struct inode *inode;
|
242 |
|
|
int error;
|
243 |
|
|
|
244 |
|
|
if ((error = server->rpc_ops->getroot(server, rootfh, &fattr)) < 0) {
|
245 |
|
|
printk(KERN_NOTICE "nfs_get_root: getattr error = %d\n", -error);
|
246 |
|
|
return NULL;
|
247 |
|
|
}
|
248 |
|
|
|
249 |
|
|
inode = __nfs_fhget(sb, rootfh, &fattr);
|
250 |
|
|
return inode;
|
251 |
|
|
}
|
252 |
|
|
|
253 |
|
|
/*
|
254 |
|
|
* The way this works is that the mount process passes a structure
|
255 |
|
|
* in the data argument which contains the server's IP address
|
256 |
|
|
* and the root file handle obtained from the server's mount
|
257 |
|
|
* daemon. We stash these away in the private superblock fields.
|
258 |
|
|
*/
|
259 |
|
|
struct super_block *
|
260 |
|
|
nfs_read_super(struct super_block *sb, void *raw_data, int silent)
|
261 |
|
|
{
|
262 |
|
|
struct nfs_mount_data *data = (struct nfs_mount_data *) raw_data;
|
263 |
|
|
struct nfs_server *server;
|
264 |
|
|
struct rpc_xprt *xprt = NULL;
|
265 |
|
|
struct rpc_clnt *clnt = NULL;
|
266 |
|
|
struct nfs_fh *root = &data->root, fh;
|
267 |
|
|
struct inode *root_inode = NULL;
|
268 |
|
|
unsigned int authflavor;
|
269 |
|
|
struct sockaddr_in srvaddr;
|
270 |
|
|
struct rpc_timeout timeparms;
|
271 |
|
|
struct nfs_fsinfo fsinfo;
|
272 |
|
|
int tcp, version, maxlen;
|
273 |
|
|
|
274 |
|
|
memset(&sb->u.nfs_sb, 0, sizeof(sb->u.nfs_sb));
|
275 |
|
|
if (!data)
|
276 |
|
|
goto out_miss_args;
|
277 |
|
|
|
278 |
|
|
memset(&fh, 0, sizeof(fh));
|
279 |
|
|
if (data->version != NFS_MOUNT_VERSION) {
|
280 |
|
|
printk("nfs warning: mount version %s than kernel\n",
|
281 |
|
|
data->version < NFS_MOUNT_VERSION ? "older" : "newer");
|
282 |
|
|
if (data->version < 2)
|
283 |
|
|
data->namlen = 0;
|
284 |
|
|
if (data->version < 3)
|
285 |
|
|
data->bsize = 0;
|
286 |
|
|
if (data->version < 4) {
|
287 |
|
|
data->flags &= ~NFS_MOUNT_VER3;
|
288 |
|
|
root = &fh;
|
289 |
|
|
root->size = NFS2_FHSIZE;
|
290 |
|
|
memcpy(root->data, data->old_root.data, NFS2_FHSIZE);
|
291 |
|
|
}
|
292 |
|
|
}
|
293 |
|
|
|
294 |
|
|
/* We now require that the mount process passes the remote address */
|
295 |
|
|
memcpy(&srvaddr, &data->addr, sizeof(srvaddr));
|
296 |
|
|
if (srvaddr.sin_addr.s_addr == INADDR_ANY)
|
297 |
|
|
goto out_no_remote;
|
298 |
|
|
|
299 |
|
|
sb->s_magic = NFS_SUPER_MAGIC;
|
300 |
|
|
sb->s_op = &nfs_sops;
|
301 |
|
|
sb->s_blocksize_bits = 0;
|
302 |
|
|
sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
|
303 |
|
|
server = &sb->u.nfs_sb.s_server;
|
304 |
|
|
server->rsize = nfs_block_size(data->rsize, NULL);
|
305 |
|
|
server->wsize = nfs_block_size(data->wsize, NULL);
|
306 |
|
|
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
307 |
|
|
|
308 |
|
|
if (data->flags & NFS_MOUNT_NOAC) {
|
309 |
|
|
data->acregmin = data->acregmax = 0;
|
310 |
|
|
data->acdirmin = data->acdirmax = 0;
|
311 |
|
|
sb->s_flags |= MS_SYNCHRONOUS;
|
312 |
|
|
}
|
313 |
|
|
server->acregmin = data->acregmin*HZ;
|
314 |
|
|
server->acregmax = data->acregmax*HZ;
|
315 |
|
|
server->acdirmin = data->acdirmin*HZ;
|
316 |
|
|
server->acdirmax = data->acdirmax*HZ;
|
317 |
|
|
|
318 |
|
|
server->namelen = data->namlen;
|
319 |
|
|
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
|
320 |
|
|
if (!server->hostname)
|
321 |
|
|
goto out_unlock;
|
322 |
|
|
strcpy(server->hostname, data->hostname);
|
323 |
|
|
INIT_LIST_HEAD(&server->lru_read);
|
324 |
|
|
INIT_LIST_HEAD(&server->lru_dirty);
|
325 |
|
|
INIT_LIST_HEAD(&server->lru_commit);
|
326 |
|
|
INIT_LIST_HEAD(&server->lru_busy);
|
327 |
|
|
|
328 |
|
|
nfsv3_try_again:
|
329 |
|
|
/* Check NFS protocol revision and initialize RPC op vector
|
330 |
|
|
* and file handle pool. */
|
331 |
|
|
if (data->flags & NFS_MOUNT_VER3) {
|
332 |
|
|
#ifdef CONFIG_NFS_V3
|
333 |
|
|
server->rpc_ops = &nfs_v3_clientops;
|
334 |
|
|
version = 3;
|
335 |
|
|
if (data->version < 4) {
|
336 |
|
|
printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
|
337 |
|
|
goto out_unlock;
|
338 |
|
|
}
|
339 |
|
|
#else
|
340 |
|
|
printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
|
341 |
|
|
goto out_unlock;
|
342 |
|
|
#endif
|
343 |
|
|
} else {
|
344 |
|
|
server->rpc_ops = &nfs_v2_clientops;
|
345 |
|
|
version = 2;
|
346 |
|
|
}
|
347 |
|
|
|
348 |
|
|
/* Which protocol do we use? */
|
349 |
|
|
tcp = (data->flags & NFS_MOUNT_TCP);
|
350 |
|
|
|
351 |
|
|
/* Initialize timeout values */
|
352 |
|
|
timeparms.to_initval = data->timeo * HZ / 10;
|
353 |
|
|
timeparms.to_retries = data->retrans;
|
354 |
|
|
timeparms.to_maxval = tcp? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
|
355 |
|
|
timeparms.to_exponential = 1;
|
356 |
|
|
|
357 |
|
|
if (!timeparms.to_initval)
|
358 |
|
|
timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
|
359 |
|
|
if (!timeparms.to_retries)
|
360 |
|
|
timeparms.to_retries = 5;
|
361 |
|
|
|
362 |
|
|
/* Now create transport and client */
|
363 |
|
|
xprt = xprt_create_proto(tcp? IPPROTO_TCP : IPPROTO_UDP,
|
364 |
|
|
&srvaddr, &timeparms);
|
365 |
|
|
if (xprt == NULL)
|
366 |
|
|
goto out_no_xprt;
|
367 |
|
|
|
368 |
|
|
/* Choose authentication flavor */
|
369 |
|
|
authflavor = RPC_AUTH_UNIX;
|
370 |
|
|
if (data->flags & NFS_MOUNT_SECURE)
|
371 |
|
|
authflavor = RPC_AUTH_DES;
|
372 |
|
|
else if (data->flags & NFS_MOUNT_KERBEROS)
|
373 |
|
|
authflavor = RPC_AUTH_KRB;
|
374 |
|
|
|
375 |
|
|
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
|
376 |
|
|
version, authflavor);
|
377 |
|
|
if (clnt == NULL)
|
378 |
|
|
goto out_no_client;
|
379 |
|
|
|
380 |
|
|
clnt->cl_intr = (data->flags & NFS_MOUNT_INTR)? 1 : 0;
|
381 |
|
|
clnt->cl_softrtry = (data->flags & NFS_MOUNT_SOFT)? 1 : 0;
|
382 |
|
|
clnt->cl_droppriv = (data->flags & NFS_MOUNT_BROKEN_SUID) ? 1 : 0;
|
383 |
|
|
clnt->cl_chatty = 1;
|
384 |
|
|
server->client = clnt;
|
385 |
|
|
|
386 |
|
|
/* Fire up rpciod if not yet running */
|
387 |
|
|
if (rpciod_up() != 0)
|
388 |
|
|
goto out_no_iod;
|
389 |
|
|
|
390 |
|
|
/*
|
391 |
|
|
* Keep the super block locked while we try to get
|
392 |
|
|
* the root fh attributes.
|
393 |
|
|
*/
|
394 |
|
|
/* Did getting the root inode fail? */
|
395 |
|
|
if (!(root_inode = nfs_get_root(sb, root))
|
396 |
|
|
&& (data->flags & NFS_MOUNT_VER3)) {
|
397 |
|
|
data->flags &= ~NFS_MOUNT_VER3;
|
398 |
|
|
rpciod_down();
|
399 |
|
|
rpc_shutdown_client(server->client);
|
400 |
|
|
goto nfsv3_try_again;
|
401 |
|
|
}
|
402 |
|
|
|
403 |
|
|
if (!root_inode)
|
404 |
|
|
goto out_no_root;
|
405 |
|
|
sb->s_root = d_alloc_root(root_inode);
|
406 |
|
|
if (!sb->s_root)
|
407 |
|
|
goto out_no_root;
|
408 |
|
|
|
409 |
|
|
sb->s_root->d_op = &nfs_dentry_operations;
|
410 |
|
|
|
411 |
|
|
/* Get some general file system info */
|
412 |
|
|
if (server->rpc_ops->statfs(server, root, &fsinfo) >= 0) {
|
413 |
|
|
if (server->namelen == 0)
|
414 |
|
|
server->namelen = fsinfo.namelen;
|
415 |
|
|
} else {
|
416 |
|
|
printk(KERN_NOTICE "NFS: cannot retrieve file system info.\n");
|
417 |
|
|
goto out_no_root;
|
418 |
|
|
}
|
419 |
|
|
|
420 |
|
|
/* Work out a lot of parameters */
|
421 |
|
|
if (data->rsize == 0)
|
422 |
|
|
server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
|
423 |
|
|
if (data->wsize == 0)
|
424 |
|
|
server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
|
425 |
|
|
/* NFSv3: we don't have bsize, but rather rtmult and wtmult... */
|
426 |
|
|
if (!fsinfo.bsize)
|
427 |
|
|
fsinfo.bsize = (fsinfo.rtmult>fsinfo.wtmult) ? fsinfo.rtmult : fsinfo.wtmult;
|
428 |
|
|
/* Also make sure we don't go below rsize/wsize since
|
429 |
|
|
* RPC calls are expensive */
|
430 |
|
|
if (fsinfo.bsize < server->rsize)
|
431 |
|
|
fsinfo.bsize = server->rsize;
|
432 |
|
|
if (fsinfo.bsize < server->wsize)
|
433 |
|
|
fsinfo.bsize = server->wsize;
|
434 |
|
|
|
435 |
|
|
if (data->bsize == 0)
|
436 |
|
|
sb->s_blocksize = nfs_block_bits(fsinfo.bsize, &sb->s_blocksize_bits);
|
437 |
|
|
if (server->rsize > fsinfo.rtmax)
|
438 |
|
|
server->rsize = fsinfo.rtmax;
|
439 |
|
|
if (server->wsize > fsinfo.wtmax)
|
440 |
|
|
server->wsize = fsinfo.wtmax;
|
441 |
|
|
|
442 |
|
|
server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
443 |
|
|
if (server->rpages > NFS_READ_MAXIOV) {
|
444 |
|
|
server->rpages = NFS_READ_MAXIOV;
|
445 |
|
|
server->rsize = server->rpages << PAGE_CACHE_SHIFT;
|
446 |
|
|
}
|
447 |
|
|
|
448 |
|
|
server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
449 |
|
|
if (server->wpages > NFS_WRITE_MAXIOV) {
|
450 |
|
|
server->wpages = NFS_WRITE_MAXIOV;
|
451 |
|
|
server->wsize = server->wpages << PAGE_CACHE_SHIFT;
|
452 |
|
|
}
|
453 |
|
|
|
454 |
|
|
server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
|
455 |
|
|
if (server->dtsize > PAGE_CACHE_SIZE)
|
456 |
|
|
server->dtsize = PAGE_CACHE_SIZE;
|
457 |
|
|
if (server->dtsize > server->rsize)
|
458 |
|
|
server->dtsize = server->rsize;
|
459 |
|
|
|
460 |
|
|
maxlen = (version == 2) ? NFS2_MAXNAMLEN : NFS3_MAXNAMLEN;
|
461 |
|
|
|
462 |
|
|
if (server->namelen == 0 || server->namelen > maxlen)
|
463 |
|
|
server->namelen = maxlen;
|
464 |
|
|
|
465 |
|
|
sb->s_maxbytes = fsinfo.maxfilesize;
|
466 |
|
|
if (sb->s_maxbytes > MAX_LFS_FILESIZE)
|
467 |
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
468 |
|
|
|
469 |
|
|
/* Fire up the writeback cache */
|
470 |
|
|
if (nfs_reqlist_alloc(server) < 0) {
|
471 |
|
|
printk(KERN_NOTICE "NFS: cannot initialize writeback cache.\n");
|
472 |
|
|
goto failure_kill_reqlist;
|
473 |
|
|
}
|
474 |
|
|
|
475 |
|
|
/* We're airborne Set socket buffersize */
|
476 |
|
|
rpc_setbufsize(clnt, server->wsize + 100, server->rsize + 100);
|
477 |
|
|
|
478 |
|
|
/* Check whether to start the lockd process */
|
479 |
|
|
if (!(server->flags & NFS_MOUNT_NONLM))
|
480 |
|
|
lockd_up();
|
481 |
|
|
return sb;
|
482 |
|
|
|
483 |
|
|
/* Yargs. It didn't work out. */
|
484 |
|
|
failure_kill_reqlist:
|
485 |
|
|
nfs_reqlist_exit(server);
|
486 |
|
|
out_no_root:
|
487 |
|
|
printk("nfs_read_super: get root inode failed\n");
|
488 |
|
|
iput(root_inode);
|
489 |
|
|
rpciod_down();
|
490 |
|
|
goto out_shutdown;
|
491 |
|
|
|
492 |
|
|
out_no_iod:
|
493 |
|
|
printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
|
494 |
|
|
out_shutdown:
|
495 |
|
|
rpc_shutdown_client(server->client);
|
496 |
|
|
goto out_free_host;
|
497 |
|
|
|
498 |
|
|
out_no_client:
|
499 |
|
|
printk(KERN_WARNING "NFS: cannot create RPC client.\n");
|
500 |
|
|
xprt_destroy(xprt);
|
501 |
|
|
goto out_free_host;
|
502 |
|
|
|
503 |
|
|
out_no_xprt:
|
504 |
|
|
printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
|
505 |
|
|
|
506 |
|
|
out_free_host:
|
507 |
|
|
nfs_reqlist_free(server);
|
508 |
|
|
kfree(server->hostname);
|
509 |
|
|
out_unlock:
|
510 |
|
|
goto out_fail;
|
511 |
|
|
|
512 |
|
|
out_no_remote:
|
513 |
|
|
printk("NFS: mount program didn't pass remote address!\n");
|
514 |
|
|
goto out_fail;
|
515 |
|
|
|
516 |
|
|
out_miss_args:
|
517 |
|
|
printk("nfs_read_super: missing data argument\n");
|
518 |
|
|
|
519 |
|
|
out_fail:
|
520 |
|
|
return NULL;
|
521 |
|
|
}
|
522 |
|
|
|
523 |
|
|
static int
|
524 |
|
|
nfs_statfs(struct super_block *sb, struct statfs *buf)
|
525 |
|
|
{
|
526 |
|
|
struct nfs_server *server = &sb->u.nfs_sb.s_server;
|
527 |
|
|
unsigned char blockbits;
|
528 |
|
|
unsigned long blockres;
|
529 |
|
|
struct nfs_fsinfo res;
|
530 |
|
|
int error;
|
531 |
|
|
|
532 |
|
|
error = server->rpc_ops->statfs(server, NFS_FH(sb->s_root->d_inode), &res);
|
533 |
|
|
buf->f_type = NFS_SUPER_MAGIC;
|
534 |
|
|
if (error < 0)
|
535 |
|
|
goto out_err;
|
536 |
|
|
|
537 |
|
|
if (res.bsize == 0)
|
538 |
|
|
res.bsize = sb->s_blocksize;
|
539 |
|
|
buf->f_bsize = nfs_block_bits(res.bsize, &blockbits);
|
540 |
|
|
blockres = (1 << blockbits) - 1;
|
541 |
|
|
buf->f_blocks = (res.tbytes + blockres) >> blockbits;
|
542 |
|
|
buf->f_bfree = (res.fbytes + blockres) >> blockbits;
|
543 |
|
|
buf->f_bavail = (res.abytes + blockres) >> blockbits;
|
544 |
|
|
buf->f_files = res.tfiles;
|
545 |
|
|
buf->f_ffree = res.afiles;
|
546 |
|
|
if (res.namelen == 0 || res.namelen > server->namelen)
|
547 |
|
|
res.namelen = server->namelen;
|
548 |
|
|
buf->f_namelen = res.namelen;
|
549 |
|
|
return 0;
|
550 |
|
|
out_err:
|
551 |
|
|
printk("nfs_statfs: statfs error = %d\n", -error);
|
552 |
|
|
buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
|
553 |
|
|
return 0;
|
554 |
|
|
}
|
555 |
|
|
|
556 |
|
|
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
|
557 |
|
|
{
|
558 |
|
|
static struct proc_nfs_info {
|
559 |
|
|
int flag;
|
560 |
|
|
char *str;
|
561 |
|
|
char *nostr;
|
562 |
|
|
} nfs_info[] = {
|
563 |
|
|
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
|
564 |
|
|
{ NFS_MOUNT_INTR, ",intr", "" },
|
565 |
|
|
{ NFS_MOUNT_POSIX, ",posix", "" },
|
566 |
|
|
{ NFS_MOUNT_TCP, ",tcp", ",udp" },
|
567 |
|
|
{ NFS_MOUNT_NOCTO, ",nocto", "" },
|
568 |
|
|
{ NFS_MOUNT_NOAC, ",noac", "" },
|
569 |
|
|
{ NFS_MOUNT_NONLM, ",nolock", ",lock" },
|
570 |
|
|
{ NFS_MOUNT_BROKEN_SUID, ",broken_suid", "" },
|
571 |
|
|
{ 0, NULL, NULL }
|
572 |
|
|
};
|
573 |
|
|
struct proc_nfs_info *nfs_infop;
|
574 |
|
|
struct nfs_server *nfss = &mnt->mnt_sb->u.nfs_sb.s_server;
|
575 |
|
|
|
576 |
|
|
seq_printf(m, ",v%d", nfss->rpc_ops->version);
|
577 |
|
|
seq_printf(m, ",rsize=%d", nfss->rsize);
|
578 |
|
|
seq_printf(m, ",wsize=%d", nfss->wsize);
|
579 |
|
|
if (nfss->acregmin != 3*HZ)
|
580 |
|
|
seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
|
581 |
|
|
if (nfss->acregmax != 60*HZ)
|
582 |
|
|
seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
|
583 |
|
|
if (nfss->acdirmin != 30*HZ)
|
584 |
|
|
seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
|
585 |
|
|
if (nfss->acdirmax != 60*HZ)
|
586 |
|
|
seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
|
587 |
|
|
for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
|
588 |
|
|
if (nfss->flags & nfs_infop->flag)
|
589 |
|
|
seq_puts(m, nfs_infop->str);
|
590 |
|
|
else
|
591 |
|
|
seq_puts(m, nfs_infop->nostr);
|
592 |
|
|
}
|
593 |
|
|
seq_puts(m, ",addr=");
|
594 |
|
|
seq_escape(m, nfss->hostname, " \t\n\\");
|
595 |
|
|
return 0;
|
596 |
|
|
}
|
597 |
|
|
|
598 |
|
|
/*
|
599 |
|
|
* Invalidate the local caches
|
600 |
|
|
*/
|
601 |
|
|
void
|
602 |
|
|
nfs_zap_caches(struct inode *inode)
|
603 |
|
|
{
|
604 |
|
|
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
|
605 |
|
|
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
|
606 |
|
|
|
607 |
|
|
invalidate_inode_pages(inode);
|
608 |
|
|
|
609 |
|
|
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
|
610 |
|
|
NFS_CACHEINV(inode);
|
611 |
|
|
}
|
612 |
|
|
|
613 |
|
|
/*
|
614 |
|
|
* Invalidate, but do not unhash, the inode
|
615 |
|
|
*/
|
616 |
|
|
static void
|
617 |
|
|
nfs_invalidate_inode(struct inode *inode)
|
618 |
|
|
{
|
619 |
|
|
umode_t save_mode = inode->i_mode;
|
620 |
|
|
|
621 |
|
|
make_bad_inode(inode);
|
622 |
|
|
inode->i_mode = save_mode;
|
623 |
|
|
nfs_zap_caches(inode);
|
624 |
|
|
}
|
625 |
|
|
|
626 |
|
|
/*
|
627 |
|
|
* Fill in inode information from the fattr.
|
628 |
|
|
*/
|
629 |
|
|
static void
|
630 |
|
|
nfs_fill_inode(struct inode *inode, struct nfs_fh *fh, struct nfs_fattr *fattr)
|
631 |
|
|
{
|
632 |
|
|
/*
|
633 |
|
|
* Check whether the mode has been set, as we only want to
|
634 |
|
|
* do this once. (We don't allow inodes to change types.)
|
635 |
|
|
*/
|
636 |
|
|
if (inode->i_mode == 0) {
|
637 |
|
|
NFS_FILEID(inode) = fattr->fileid;
|
638 |
|
|
inode->i_mode = fattr->mode;
|
639 |
|
|
/* Why so? Because we want revalidate for devices/FIFOs, and
|
640 |
|
|
* that's precisely what we have in nfs_file_inode_operations.
|
641 |
|
|
*/
|
642 |
|
|
inode->i_op = &nfs_file_inode_operations;
|
643 |
|
|
if (S_ISREG(inode->i_mode)) {
|
644 |
|
|
inode->i_fop = &nfs_file_operations;
|
645 |
|
|
inode->i_data.a_ops = &nfs_file_aops;
|
646 |
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
647 |
|
|
inode->i_op = &nfs_dir_inode_operations;
|
648 |
|
|
inode->i_fop = &nfs_dir_operations;
|
649 |
|
|
} else if (S_ISLNK(inode->i_mode))
|
650 |
|
|
inode->i_op = &nfs_symlink_inode_operations;
|
651 |
|
|
else
|
652 |
|
|
init_special_inode(inode, inode->i_mode, fattr->rdev);
|
653 |
|
|
memcpy(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh));
|
654 |
|
|
}
|
655 |
|
|
nfs_refresh_inode(inode, fattr);
|
656 |
|
|
}
|
657 |
|
|
|
658 |
|
|
struct nfs_find_desc {
|
659 |
|
|
struct nfs_fh *fh;
|
660 |
|
|
struct nfs_fattr *fattr;
|
661 |
|
|
};
|
662 |
|
|
|
663 |
|
|
/*
|
664 |
|
|
* In NFSv3 we can have 64bit inode numbers. In order to support
|
665 |
|
|
* this, and re-exported directories (also seen in NFSv2)
|
666 |
|
|
* we are forced to allow 2 different inodes to have the same
|
667 |
|
|
* i_ino.
|
668 |
|
|
*/
|
669 |
|
|
static int
|
670 |
|
|
nfs_find_actor(struct inode *inode, unsigned long ino, void *opaque)
|
671 |
|
|
{
|
672 |
|
|
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
|
673 |
|
|
struct nfs_fh *fh = desc->fh;
|
674 |
|
|
struct nfs_fattr *fattr = desc->fattr;
|
675 |
|
|
|
676 |
|
|
if (NFS_FILEID(inode) != fattr->fileid)
|
677 |
|
|
return 0;
|
678 |
|
|
if (memcmp(&inode->u.nfs_i.fh, fh, sizeof(inode->u.nfs_i.fh)) != 0)
|
679 |
|
|
return 0;
|
680 |
|
|
if (is_bad_inode(inode))
|
681 |
|
|
return 0;
|
682 |
|
|
/* Force an attribute cache update if inode->i_count == 0 */
|
683 |
|
|
if (!atomic_read(&inode->i_count))
|
684 |
|
|
NFS_CACHEINV(inode);
|
685 |
|
|
return 1;
|
686 |
|
|
}
|
687 |
|
|
|
688 |
|
|
/*
|
689 |
|
|
* This is our own version of iget that looks up inodes by file handle
|
690 |
|
|
* instead of inode number. We use this technique instead of using
|
691 |
|
|
* the vfs read_inode function because there is no way to pass the
|
692 |
|
|
* file handle or current attributes into the read_inode function.
|
693 |
|
|
*
|
694 |
|
|
*/
|
695 |
|
|
struct inode *
|
696 |
|
|
nfs_fhget(struct dentry *dentry, struct nfs_fh *fhandle,
|
697 |
|
|
struct nfs_fattr *fattr)
|
698 |
|
|
{
|
699 |
|
|
struct super_block *sb = dentry->d_sb;
|
700 |
|
|
|
701 |
|
|
dprintk("NFS: nfs_fhget(%s/%s fileid=%Ld)\n",
|
702 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
703 |
|
|
(long long)fattr->fileid);
|
704 |
|
|
return __nfs_fhget(sb, fhandle, fattr);
|
705 |
|
|
}
|
706 |
|
|
|
707 |
|
|
/*
|
708 |
|
|
* Look up the inode by super block and fattr->fileid.
|
709 |
|
|
*/
|
710 |
|
|
static struct inode *
|
711 |
|
|
__nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
|
712 |
|
|
{
|
713 |
|
|
struct nfs_find_desc desc = { fh, fattr };
|
714 |
|
|
struct inode *inode = NULL;
|
715 |
|
|
unsigned long ino;
|
716 |
|
|
|
717 |
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
718 |
|
|
goto out_no_inode;
|
719 |
|
|
|
720 |
|
|
if (!fattr->nlink) {
|
721 |
|
|
printk("NFS: Buggy server - nlink == 0!\n");
|
722 |
|
|
goto out_no_inode;
|
723 |
|
|
}
|
724 |
|
|
|
725 |
|
|
ino = nfs_fattr_to_ino_t(fattr);
|
726 |
|
|
|
727 |
|
|
if (!(inode = iget4(sb, ino, nfs_find_actor, &desc)))
|
728 |
|
|
goto out_no_inode;
|
729 |
|
|
|
730 |
|
|
nfs_fill_inode(inode, fh, fattr);
|
731 |
|
|
dprintk("NFS: __nfs_fhget(%x/%Ld ct=%d)\n",
|
732 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode),
|
733 |
|
|
atomic_read(&inode->i_count));
|
734 |
|
|
|
735 |
|
|
out:
|
736 |
|
|
return inode;
|
737 |
|
|
|
738 |
|
|
out_no_inode:
|
739 |
|
|
printk("__nfs_fhget: iget failed\n");
|
740 |
|
|
goto out;
|
741 |
|
|
}
|
742 |
|
|
|
743 |
|
|
int
|
744 |
|
|
nfs_notify_change(struct dentry *dentry, struct iattr *attr)
|
745 |
|
|
{
|
746 |
|
|
struct inode *inode = dentry->d_inode;
|
747 |
|
|
struct nfs_fattr fattr;
|
748 |
|
|
int error;
|
749 |
|
|
|
750 |
|
|
/*
|
751 |
|
|
* Make sure the inode is up-to-date.
|
752 |
|
|
*/
|
753 |
|
|
error = nfs_revalidate_inode(NFS_SERVER(inode),inode);
|
754 |
|
|
if (error) {
|
755 |
|
|
#ifdef NFS_PARANOIA
|
756 |
|
|
printk("nfs_notify_change: revalidate failed, error=%d\n", error);
|
757 |
|
|
#endif
|
758 |
|
|
goto out;
|
759 |
|
|
}
|
760 |
|
|
|
761 |
|
|
if (!S_ISREG(inode->i_mode))
|
762 |
|
|
attr->ia_valid &= ~ATTR_SIZE;
|
763 |
|
|
|
764 |
|
|
filemap_fdatasync(inode->i_mapping);
|
765 |
|
|
error = nfs_wb_all(inode);
|
766 |
|
|
filemap_fdatawait(inode->i_mapping);
|
767 |
|
|
if (error)
|
768 |
|
|
goto out;
|
769 |
|
|
|
770 |
|
|
error = NFS_PROTO(inode)->setattr(inode, &fattr, attr);
|
771 |
|
|
if (error)
|
772 |
|
|
goto out;
|
773 |
|
|
/*
|
774 |
|
|
* If we changed the size or mtime, update the inode
|
775 |
|
|
* now to avoid invalidating the page cache.
|
776 |
|
|
*/
|
777 |
|
|
if (attr->ia_valid & ATTR_SIZE) {
|
778 |
|
|
if (attr->ia_size != fattr.size)
|
779 |
|
|
printk("nfs_notify_change: attr=%Ld, fattr=%Ld??\n",
|
780 |
|
|
(long long) attr->ia_size, (long long)fattr.size);
|
781 |
|
|
vmtruncate(inode, attr->ia_size);
|
782 |
|
|
}
|
783 |
|
|
|
784 |
|
|
/*
|
785 |
|
|
* If we changed the size or mtime, update the inode
|
786 |
|
|
* now to avoid invalidating the page cache.
|
787 |
|
|
*/
|
788 |
|
|
if (!(fattr.valid & NFS_ATTR_WCC)) {
|
789 |
|
|
fattr.pre_size = NFS_CACHE_ISIZE(inode);
|
790 |
|
|
fattr.pre_mtime = NFS_CACHE_MTIME(inode);
|
791 |
|
|
fattr.pre_ctime = NFS_CACHE_CTIME(inode);
|
792 |
|
|
fattr.valid |= NFS_ATTR_WCC;
|
793 |
|
|
}
|
794 |
|
|
/* Force an attribute cache update */
|
795 |
|
|
NFS_CACHEINV(inode);
|
796 |
|
|
error = nfs_refresh_inode(inode, &fattr);
|
797 |
|
|
out:
|
798 |
|
|
return error;
|
799 |
|
|
}
|
800 |
|
|
|
801 |
|
|
/*
|
802 |
|
|
* Wait for the inode to get unlocked.
|
803 |
|
|
* (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
|
804 |
|
|
*/
|
805 |
|
|
int
|
806 |
|
|
nfs_wait_on_inode(struct inode *inode, int flag)
|
807 |
|
|
{
|
808 |
|
|
struct rpc_clnt *clnt = NFS_CLIENT(inode);
|
809 |
|
|
int error;
|
810 |
|
|
if (!(NFS_FLAGS(inode) & flag))
|
811 |
|
|
return 0;
|
812 |
|
|
atomic_inc(&inode->i_count);
|
813 |
|
|
error = nfs_wait_event(clnt, inode->i_wait, !(NFS_FLAGS(inode) & flag));
|
814 |
|
|
iput(inode);
|
815 |
|
|
return error;
|
816 |
|
|
}
|
817 |
|
|
|
818 |
|
|
/*
|
819 |
|
|
* Externally visible revalidation function
|
820 |
|
|
*/
|
821 |
|
|
int
|
822 |
|
|
nfs_revalidate(struct dentry *dentry)
|
823 |
|
|
{
|
824 |
|
|
struct inode *inode = dentry->d_inode;
|
825 |
|
|
return nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
826 |
|
|
}
|
827 |
|
|
|
828 |
|
|
/*
|
829 |
|
|
* Ensure that mmap has a recent RPC credential for use when writing out
|
830 |
|
|
* shared pages
|
831 |
|
|
*/
|
832 |
|
|
static inline void
|
833 |
|
|
nfs_set_mmcred(struct inode *inode, struct rpc_cred *cred)
|
834 |
|
|
{
|
835 |
|
|
struct rpc_cred **p = &NFS_I(inode)->mm_cred,
|
836 |
|
|
*oldcred = *p;
|
837 |
|
|
|
838 |
|
|
*p = get_rpccred(cred);
|
839 |
|
|
if (oldcred)
|
840 |
|
|
put_rpccred(oldcred);
|
841 |
|
|
}
|
842 |
|
|
|
843 |
|
|
/*
|
844 |
|
|
* These are probably going to contain hooks for
|
845 |
|
|
* allocating and releasing RPC credentials for
|
846 |
|
|
* the file. I'll have to think about Tronds patch
|
847 |
|
|
* a bit more..
|
848 |
|
|
*/
|
849 |
|
|
int nfs_open(struct inode *inode, struct file *filp)
|
850 |
|
|
{
|
851 |
|
|
struct rpc_auth *auth;
|
852 |
|
|
struct rpc_cred *cred;
|
853 |
|
|
|
854 |
|
|
lock_kernel();
|
855 |
|
|
auth = NFS_CLIENT(inode)->cl_auth;
|
856 |
|
|
cred = rpcauth_lookupcred(auth, 0);
|
857 |
|
|
filp->private_data = cred;
|
858 |
|
|
if (filp->f_mode & FMODE_WRITE)
|
859 |
|
|
nfs_set_mmcred(inode, cred);
|
860 |
|
|
unlock_kernel();
|
861 |
|
|
return 0;
|
862 |
|
|
}
|
863 |
|
|
|
864 |
|
|
int nfs_release(struct inode *inode, struct file *filp)
|
865 |
|
|
{
|
866 |
|
|
struct rpc_cred *cred;
|
867 |
|
|
|
868 |
|
|
lock_kernel();
|
869 |
|
|
cred = nfs_file_cred(filp);
|
870 |
|
|
if (cred)
|
871 |
|
|
put_rpccred(cred);
|
872 |
|
|
unlock_kernel();
|
873 |
|
|
return 0;
|
874 |
|
|
}
|
875 |
|
|
|
876 |
|
|
/*
|
877 |
|
|
* This function is called whenever some part of NFS notices that
|
878 |
|
|
* the cached attributes have to be refreshed.
|
879 |
|
|
*/
|
880 |
|
|
int
|
881 |
|
|
__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
|
882 |
|
|
{
|
883 |
|
|
int status = -ESTALE;
|
884 |
|
|
struct nfs_fattr fattr;
|
885 |
|
|
|
886 |
|
|
dfprintk(PAGECACHE, "NFS: revalidating (%x/%Ld)\n",
|
887 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode));
|
888 |
|
|
|
889 |
|
|
lock_kernel();
|
890 |
|
|
if (!inode || is_bad_inode(inode))
|
891 |
|
|
goto out_nowait;
|
892 |
|
|
if (NFS_STALE(inode) && inode != inode->i_sb->s_root->d_inode)
|
893 |
|
|
goto out_nowait;
|
894 |
|
|
|
895 |
|
|
while (NFS_REVALIDATING(inode)) {
|
896 |
|
|
status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
|
897 |
|
|
if (status < 0)
|
898 |
|
|
goto out_nowait;
|
899 |
|
|
if (time_before(jiffies,NFS_READTIME(inode)+NFS_ATTRTIMEO(inode))) {
|
900 |
|
|
status = NFS_STALE(inode) ? -ESTALE : 0;
|
901 |
|
|
goto out_nowait;
|
902 |
|
|
}
|
903 |
|
|
}
|
904 |
|
|
NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
|
905 |
|
|
|
906 |
|
|
status = NFS_PROTO(inode)->getattr(inode, &fattr);
|
907 |
|
|
if (status) {
|
908 |
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%x/%Ld) getattr failed, error=%d\n",
|
909 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode), status);
|
910 |
|
|
if (status == -ESTALE) {
|
911 |
|
|
NFS_FLAGS(inode) |= NFS_INO_STALE;
|
912 |
|
|
if (inode != inode->i_sb->s_root->d_inode)
|
913 |
|
|
remove_inode_hash(inode);
|
914 |
|
|
}
|
915 |
|
|
goto out;
|
916 |
|
|
}
|
917 |
|
|
|
918 |
|
|
status = nfs_refresh_inode(inode, &fattr);
|
919 |
|
|
if (status) {
|
920 |
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%x/%Ld) refresh failed, error=%d\n",
|
921 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode), status);
|
922 |
|
|
goto out;
|
923 |
|
|
}
|
924 |
|
|
dfprintk(PAGECACHE, "NFS: (%x/%Ld) revalidation complete\n",
|
925 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode));
|
926 |
|
|
|
927 |
|
|
NFS_FLAGS(inode) &= ~NFS_INO_STALE;
|
928 |
|
|
out:
|
929 |
|
|
NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
|
930 |
|
|
wake_up(&inode->i_wait);
|
931 |
|
|
out_nowait:
|
932 |
|
|
unlock_kernel();
|
933 |
|
|
return status;
|
934 |
|
|
}
|
935 |
|
|
|
936 |
|
|
/*
|
937 |
|
|
* nfs_fattr_obsolete - Test if attribute data is newer than cached data
|
938 |
|
|
* @inode: inode
|
939 |
|
|
* @fattr: attributes to test
|
940 |
|
|
*
|
941 |
|
|
* Avoid stuffing the attribute cache with obsolete information.
|
942 |
|
|
* We always accept updates if the attribute cache timed out, or if
|
943 |
|
|
* fattr->ctime is newer than our cached value.
|
944 |
|
|
* If fattr->ctime matches the cached value, we still accept the update
|
945 |
|
|
* if it increases the file size.
|
946 |
|
|
*/
|
947 |
|
|
static inline
|
948 |
|
|
int nfs_fattr_obsolete(struct inode *inode, struct nfs_fattr *fattr)
|
949 |
|
|
{
|
950 |
|
|
s64 cdif;
|
951 |
|
|
|
952 |
|
|
if (time_after(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
|
953 |
|
|
goto out_valid;
|
954 |
|
|
if ((cdif = (s64)fattr->ctime - (s64)NFS_CACHE_CTIME(inode)) > 0)
|
955 |
|
|
goto out_valid;
|
956 |
|
|
/* Ugh... */
|
957 |
|
|
if (cdif == 0 && fattr->size > NFS_CACHE_ISIZE(inode))
|
958 |
|
|
goto out_valid;
|
959 |
|
|
return -1;
|
960 |
|
|
out_valid:
|
961 |
|
|
return 0;
|
962 |
|
|
}
|
963 |
|
|
|
964 |
|
|
/*
|
965 |
|
|
* Many nfs protocol calls return the new file attributes after
|
966 |
|
|
* an operation. Here we update the inode to reflect the state
|
967 |
|
|
* of the server's inode.
|
968 |
|
|
*
|
969 |
|
|
* This is a bit tricky because we have to make sure all dirty pages
|
970 |
|
|
* have been sent off to the server before calling invalidate_inode_pages.
|
971 |
|
|
* To make sure no other process adds more write requests while we try
|
972 |
|
|
* our best to flush them, we make them sleep during the attribute refresh.
|
973 |
|
|
*
|
974 |
|
|
* A very similar scenario holds for the dir cache.
|
975 |
|
|
*/
|
976 |
|
|
int
|
977 |
|
|
__nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
|
978 |
|
|
{
|
979 |
|
|
__u64 new_size, new_mtime;
|
980 |
|
|
loff_t new_isize;
|
981 |
|
|
time_t new_atime;
|
982 |
|
|
int invalid = 0;
|
983 |
|
|
|
984 |
|
|
dfprintk(VFS, "NFS: refresh_inode(%x/%ld ct=%d info=0x%x)\n",
|
985 |
|
|
inode->i_dev, inode->i_ino,
|
986 |
|
|
atomic_read(&inode->i_count), fattr->valid);
|
987 |
|
|
|
988 |
|
|
if (NFS_FILEID(inode) != fattr->fileid) {
|
989 |
|
|
printk(KERN_ERR "nfs_refresh_inode: inode number mismatch\n"
|
990 |
|
|
"expected (0x%x/0x%Lx), got (0x%x/0x%Lx)\n",
|
991 |
|
|
inode->i_dev, (long long)NFS_FILEID(inode),
|
992 |
|
|
inode->i_dev, (long long)fattr->fileid);
|
993 |
|
|
goto out_err;
|
994 |
|
|
}
|
995 |
|
|
|
996 |
|
|
/*
|
997 |
|
|
* Make sure the inode's type hasn't changed.
|
998 |
|
|
*/
|
999 |
|
|
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
|
1000 |
|
|
goto out_changed;
|
1001 |
|
|
|
1002 |
|
|
new_mtime = fattr->mtime;
|
1003 |
|
|
new_size = fattr->size;
|
1004 |
|
|
new_isize = nfs_size_to_loff_t(fattr->size);
|
1005 |
|
|
|
1006 |
|
|
new_atime = nfs_time_to_secs(fattr->atime);
|
1007 |
|
|
/* Avoid races */
|
1008 |
|
|
if (nfs_fattr_obsolete(inode, fattr))
|
1009 |
|
|
goto out_nochange;
|
1010 |
|
|
|
1011 |
|
|
/*
|
1012 |
|
|
* Update the read time so we don't revalidate too often.
|
1013 |
|
|
*/
|
1014 |
|
|
NFS_READTIME(inode) = jiffies;
|
1015 |
|
|
|
1016 |
|
|
/*
|
1017 |
|
|
* Note: NFS_CACHE_ISIZE(inode) reflects the state of the cache.
|
1018 |
|
|
* NOT inode->i_size!!!
|
1019 |
|
|
*/
|
1020 |
|
|
if (NFS_CACHE_ISIZE(inode) != new_size) {
|
1021 |
|
|
#ifdef NFS_DEBUG_VERBOSE
|
1022 |
|
|
printk(KERN_DEBUG "NFS: isize change on %x/%ld\n", inode->i_dev, inode->i_ino);
|
1023 |
|
|
#endif
|
1024 |
|
|
invalid = 1;
|
1025 |
|
|
}
|
1026 |
|
|
|
1027 |
|
|
/*
|
1028 |
|
|
* Note: we don't check inode->i_mtime since pipes etc.
|
1029 |
|
|
* can change this value in VFS without requiring a
|
1030 |
|
|
* cache revalidation.
|
1031 |
|
|
*/
|
1032 |
|
|
if (NFS_CACHE_MTIME(inode) != new_mtime) {
|
1033 |
|
|
#ifdef NFS_DEBUG_VERBOSE
|
1034 |
|
|
printk(KERN_DEBUG "NFS: mtime change on %x/%ld\n", inode->i_dev, inode->i_ino);
|
1035 |
|
|
#endif
|
1036 |
|
|
invalid = 1;
|
1037 |
|
|
}
|
1038 |
|
|
|
1039 |
|
|
/* Check Weak Cache Consistency data.
|
1040 |
|
|
* If size and mtime match the pre-operation values, we can
|
1041 |
|
|
* assume that any attribute changes were caused by our NFS
|
1042 |
|
|
* operation, so there's no need to invalidate the caches.
|
1043 |
|
|
*/
|
1044 |
|
|
if ((fattr->valid & NFS_ATTR_WCC)
|
1045 |
|
|
&& NFS_CACHE_ISIZE(inode) == fattr->pre_size
|
1046 |
|
|
&& NFS_CACHE_MTIME(inode) == fattr->pre_mtime) {
|
1047 |
|
|
invalid = 0;
|
1048 |
|
|
}
|
1049 |
|
|
|
1050 |
|
|
/*
|
1051 |
|
|
* If we have pending writebacks, things can get
|
1052 |
|
|
* messy.
|
1053 |
|
|
*/
|
1054 |
|
|
if (nfs_have_writebacks(inode) && new_isize < inode->i_size)
|
1055 |
|
|
new_isize = inode->i_size;
|
1056 |
|
|
|
1057 |
|
|
NFS_CACHE_CTIME(inode) = fattr->ctime;
|
1058 |
|
|
inode->i_ctime = nfs_time_to_secs(fattr->ctime);
|
1059 |
|
|
|
1060 |
|
|
inode->i_atime = new_atime;
|
1061 |
|
|
|
1062 |
|
|
if (NFS_CACHE_MTIME(inode) != new_mtime) {
|
1063 |
|
|
NFS_MTIME_UPDATE(inode) = jiffies;
|
1064 |
|
|
NFS_CACHE_MTIME(inode) = new_mtime;
|
1065 |
|
|
inode->i_mtime = nfs_time_to_secs(new_mtime);
|
1066 |
|
|
}
|
1067 |
|
|
|
1068 |
|
|
NFS_CACHE_ISIZE(inode) = new_size;
|
1069 |
|
|
inode->i_size = new_isize;
|
1070 |
|
|
|
1071 |
|
|
inode->i_mode = fattr->mode;
|
1072 |
|
|
inode->i_nlink = fattr->nlink;
|
1073 |
|
|
inode->i_uid = fattr->uid;
|
1074 |
|
|
inode->i_gid = fattr->gid;
|
1075 |
|
|
|
1076 |
|
|
if (fattr->valid & NFS_ATTR_FATTR_V3) {
|
1077 |
|
|
/*
|
1078 |
|
|
* report the blocks in 512byte units
|
1079 |
|
|
*/
|
1080 |
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
1081 |
|
|
inode->i_blksize = inode->i_sb->s_blocksize;
|
1082 |
|
|
} else {
|
1083 |
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
1084 |
|
|
inode->i_blksize = fattr->du.nfs2.blocksize;
|
1085 |
|
|
}
|
1086 |
|
|
inode->i_rdev = 0;
|
1087 |
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
1088 |
|
|
inode->i_rdev = to_kdev_t(fattr->rdev);
|
1089 |
|
|
|
1090 |
|
|
/* Update attrtimeo value */
|
1091 |
|
|
if (invalid) {
|
1092 |
|
|
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
|
1093 |
|
|
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
|
1094 |
|
|
invalidate_inode_pages(inode);
|
1095 |
|
|
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
|
1096 |
|
|
} else if (time_after(jiffies, NFS_ATTRTIMEO_UPDATE(inode)+NFS_ATTRTIMEO(inode))) {
|
1097 |
|
|
if ((NFS_ATTRTIMEO(inode) <<= 1) > NFS_MAXATTRTIMEO(inode))
|
1098 |
|
|
NFS_ATTRTIMEO(inode) = NFS_MAXATTRTIMEO(inode);
|
1099 |
|
|
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
|
1100 |
|
|
}
|
1101 |
|
|
|
1102 |
|
|
return 0;
|
1103 |
|
|
out_nochange:
|
1104 |
|
|
if (new_atime - inode->i_atime > 0)
|
1105 |
|
|
inode->i_atime = new_atime;
|
1106 |
|
|
return 0;
|
1107 |
|
|
out_changed:
|
1108 |
|
|
/*
|
1109 |
|
|
* Big trouble! The inode has become a different object.
|
1110 |
|
|
*/
|
1111 |
|
|
#ifdef NFS_PARANOIA
|
1112 |
|
|
printk(KERN_DEBUG "nfs_refresh_inode: inode %ld mode changed, %07o to %07o\n",
|
1113 |
|
|
inode->i_ino, inode->i_mode, fattr->mode);
|
1114 |
|
|
#endif
|
1115 |
|
|
/*
|
1116 |
|
|
* No need to worry about unhashing the dentry, as the
|
1117 |
|
|
* lookup validation will know that the inode is bad.
|
1118 |
|
|
* (But we fall through to invalidate the caches.)
|
1119 |
|
|
*/
|
1120 |
|
|
nfs_invalidate_inode(inode);
|
1121 |
|
|
out_err:
|
1122 |
|
|
return -EIO;
|
1123 |
|
|
}
|
1124 |
|
|
|
1125 |
|
|
/*
|
1126 |
|
|
* File system information
|
1127 |
|
|
*/
|
1128 |
|
|
static DECLARE_FSTYPE(nfs_fs_type, "nfs", nfs_read_super, FS_ODD_RENAME);
|
1129 |
|
|
|
1130 |
|
|
extern int nfs_init_nfspagecache(void);
|
1131 |
|
|
extern void nfs_destroy_nfspagecache(void);
|
1132 |
|
|
extern int nfs_init_readpagecache(void);
|
1133 |
|
|
extern int nfs_destroy_readpagecache(void);
|
1134 |
|
|
extern int nfs_init_writepagecache(void);
|
1135 |
|
|
extern int nfs_destroy_writepagecache(void);
|
1136 |
|
|
|
1137 |
|
|
/*
|
1138 |
|
|
* Initialize NFS
|
1139 |
|
|
*/
|
1140 |
|
|
static int __init init_nfs_fs(void)
|
1141 |
|
|
{
|
1142 |
|
|
int err;
|
1143 |
|
|
|
1144 |
|
|
err = nfs_init_nfspagecache();
|
1145 |
|
|
if (err)
|
1146 |
|
|
return err;
|
1147 |
|
|
|
1148 |
|
|
err = nfs_init_readpagecache();
|
1149 |
|
|
if (err)
|
1150 |
|
|
return err;
|
1151 |
|
|
|
1152 |
|
|
err = nfs_init_writepagecache();
|
1153 |
|
|
if (err)
|
1154 |
|
|
return err;
|
1155 |
|
|
|
1156 |
|
|
#ifdef CONFIG_PROC_FS
|
1157 |
|
|
rpc_proc_register(&nfs_rpcstat);
|
1158 |
|
|
#endif
|
1159 |
|
|
return register_filesystem(&nfs_fs_type);
|
1160 |
|
|
}
|
1161 |
|
|
|
1162 |
|
|
static void __exit exit_nfs_fs(void)
|
1163 |
|
|
{
|
1164 |
|
|
nfs_destroy_writepagecache();
|
1165 |
|
|
nfs_destroy_readpagecache();
|
1166 |
|
|
nfs_destroy_nfspagecache();
|
1167 |
|
|
#ifdef CONFIG_PROC_FS
|
1168 |
|
|
rpc_proc_unregister("nfs");
|
1169 |
|
|
#endif
|
1170 |
|
|
unregister_filesystem(&nfs_fs_type);
|
1171 |
|
|
}
|
1172 |
|
|
|
1173 |
|
|
EXPORT_NO_SYMBOLS;
|
1174 |
|
|
/* Not quite true; I just maintain it */
|
1175 |
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
1176 |
|
|
MODULE_LICENSE("GPL");
|
1177 |
|
|
|
1178 |
|
|
module_init(init_nfs_fs)
|
1179 |
|
|
module_exit(exit_nfs_fs)
|