2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <linux/crc32.h>
17 #include <asm/semaphore.h>
20 #include "lm_interface.h"
26 #include "ops_export.h"
30 static struct dentry
*gfs2_decode_fh(struct super_block
*sb
,
34 int (*acceptable
)(void *context
,
35 struct dentry
*dentry
),
38 struct gfs2_inum
this, parent
;
40 if (fh_type
!= fh_len
)
43 memset(&parent
, 0, sizeof(struct gfs2_inum
));
47 parent
.no_formal_ino
= ((uint64_t)be32_to_cpu(fh
[4])) << 32;
48 parent
.no_formal_ino
|= be32_to_cpu(fh
[5]);
49 parent
.no_addr
= ((uint64_t)be32_to_cpu(fh
[6])) << 32;
50 parent
.no_addr
|= be32_to_cpu(fh
[7]);
52 this.no_formal_ino
= ((uint64_t)be32_to_cpu(fh
[0])) << 32;
53 this.no_formal_ino
|= be32_to_cpu(fh
[1]);
54 this.no_addr
= ((uint64_t)be32_to_cpu(fh
[2])) << 32;
55 this.no_addr
|= be32_to_cpu(fh
[3]);
61 return gfs2_export_ops
.find_exported_dentry(sb
, &this, &parent
,
65 static int gfs2_encode_fh(struct dentry
*dentry
, __u32
*fh
, int *len
,
68 struct inode
*inode
= dentry
->d_inode
;
69 struct super_block
*sb
= inode
->i_sb
;
70 struct gfs2_inode
*ip
= inode
->u
.generic_ip
;
72 if (*len
< 4 || (connectable
&& *len
< 8))
75 fh
[0] = ip
->i_num
.no_formal_ino
>> 32;
76 fh
[0] = cpu_to_be32(fh
[0]);
77 fh
[1] = ip
->i_num
.no_formal_ino
& 0xFFFFFFFF;
78 fh
[1] = cpu_to_be32(fh
[1]);
79 fh
[2] = ip
->i_num
.no_addr
>> 32;
80 fh
[2] = cpu_to_be32(fh
[2]);
81 fh
[3] = ip
->i_num
.no_addr
& 0xFFFFFFFF;
82 fh
[3] = cpu_to_be32(fh
[3]);
85 if (!connectable
|| inode
== sb
->s_root
->d_inode
)
88 spin_lock(&dentry
->d_lock
);
89 inode
= dentry
->d_parent
->d_inode
;
90 ip
= inode
->u
.generic_ip
;
92 spin_unlock(&dentry
->d_lock
);
94 fh
[4] = ip
->i_num
.no_formal_ino
>> 32;
95 fh
[4] = cpu_to_be32(fh
[4]);
96 fh
[5] = ip
->i_num
.no_formal_ino
& 0xFFFFFFFF;
97 fh
[5] = cpu_to_be32(fh
[5]);
98 fh
[6] = ip
->i_num
.no_addr
>> 32;
99 fh
[6] = cpu_to_be32(fh
[6]);
100 fh
[7] = ip
->i_num
.no_addr
& 0xFFFFFFFF;
101 fh
[7] = cpu_to_be32(fh
[7]);
109 struct get_name_filldir
{
110 struct gfs2_inum inum
;
114 static int get_name_filldir(void *opaque
, const char *name
, unsigned int length
,
115 uint64_t offset
, struct gfs2_inum
*inum
,
118 struct get_name_filldir
*gnfd
= (struct get_name_filldir
*)opaque
;
120 if (!gfs2_inum_equal(inum
, &gnfd
->inum
))
123 memcpy(gnfd
->name
, name
, length
);
124 gnfd
->name
[length
] = 0;
129 static int gfs2_get_name(struct dentry
*parent
, char *name
,
130 struct dentry
*child
)
132 struct inode
*dir
= parent
->d_inode
;
133 struct inode
*inode
= child
->d_inode
;
134 struct gfs2_inode
*dip
, *ip
;
135 struct get_name_filldir gnfd
;
136 struct gfs2_holder gh
;
143 if (!S_ISDIR(dir
->i_mode
) || !inode
)
146 dip
= dir
->u
.generic_ip
;
147 ip
= inode
->u
.generic_ip
;
150 gnfd
.inum
= ip
->i_num
;
153 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
157 error
= gfs2_dir_read(dir
, &offset
, &gnfd
, get_name_filldir
);
159 gfs2_glock_dq_uninit(&gh
);
161 if (!error
&& !*name
)
167 static struct dentry
*gfs2_get_parent(struct dentry
*child
)
171 struct dentry
*dentry
;
173 gfs2_str2qstr(&dotdot
, "..");
174 inode
= gfs2_lookupi(child
->d_inode
, &dotdot
, 1, NULL
);
177 return ERR_PTR(-ENOENT
);
179 return ERR_PTR(PTR_ERR(inode
));
181 dentry
= d_alloc_anon(inode
);
184 return ERR_PTR(-ENOMEM
);
190 static struct dentry
*gfs2_get_dentry(struct super_block
*sb
, void *inum_p
)
192 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
193 struct gfs2_inum
*inum
= (struct gfs2_inum
*)inum_p
;
194 struct gfs2_holder i_gh
, ri_gh
, rgd_gh
;
195 struct gfs2_rgrpd
*rgd
;
196 struct gfs2_inode
*ip
;
198 struct dentry
*dentry
;
203 inode
= gfs2_iget(sb
, inum
);
205 ip
= inode
->u
.generic_ip
;
206 if (ip
->i_num
.no_formal_ino
!= inum
->no_formal_ino
) {
208 return ERR_PTR(-ESTALE
);
213 error
= gfs2_glock_nq_num(sdp
,
214 inum
->no_addr
, &gfs2_inode_glops
,
215 LM_ST_SHARED
, LM_FLAG_ANY
| GL_LOCAL_EXCL
,
218 return ERR_PTR(error
);
220 error
= gfs2_inode_get(i_gh
.gh_gl
, inum
, NO_CREATE
, &ip
);
226 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
231 rgd
= gfs2_blk2rgrpd(sdp
, inum
->no_addr
);
235 error
= gfs2_glock_nq_init(rgd
->rd_gl
, LM_ST_SHARED
, 0, &rgd_gh
);
240 if (gfs2_get_block_type(rgd
, inum
->no_addr
) != GFS2_BLKST_DINODE
)
243 gfs2_glock_dq_uninit(&rgd_gh
);
244 gfs2_glock_dq_uninit(&ri_gh
);
246 error
= gfs2_inode_get(i_gh
.gh_gl
, inum
, CREATE
, &ip
);
250 error
= gfs2_inode_refresh(ip
);
258 if (ip
->i_di
.di_flags
& GFS2_DIF_SYSTEM
) {
263 gfs2_glock_dq_uninit(&i_gh
);
265 inode
= gfs2_ip2v(ip
);
269 return ERR_PTR(-ENOMEM
);
272 dentry
= d_alloc_anon(inode
);
275 return ERR_PTR(-ENOMEM
);
281 gfs2_glock_dq_uninit(&rgd_gh
);
284 gfs2_glock_dq_uninit(&ri_gh
);
287 gfs2_glock_dq_uninit(&i_gh
);
288 return ERR_PTR(error
);
291 struct export_operations gfs2_export_ops
= {
292 .decode_fh
= gfs2_decode_fh
,
293 .encode_fh
= gfs2_encode_fh
,
294 .get_name
= gfs2_get_name
,
295 .get_parent
= gfs2_get_parent
,
296 .get_dentry
= gfs2_get_dentry
,