2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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>
19 #include "lm_interface.h"
25 #include "ops_export.h"
29 static struct dentry
*gfs2_decode_fh(struct super_block
*sb
,
33 int (*acceptable
)(void *context
,
34 struct dentry
*dentry
),
37 struct gfs2_inum
this, parent
;
39 if (fh_type
!= fh_len
)
42 memset(&parent
, 0, sizeof(struct gfs2_inum
));
46 parent
.no_formal_ino
= ((uint64_t)be32_to_cpu(fh
[4])) << 32;
47 parent
.no_formal_ino
|= be32_to_cpu(fh
[5]);
48 parent
.no_addr
= ((uint64_t)be32_to_cpu(fh
[6])) << 32;
49 parent
.no_addr
|= be32_to_cpu(fh
[7]);
51 this.no_formal_ino
= ((uint64_t)be32_to_cpu(fh
[0])) << 32;
52 this.no_formal_ino
|= be32_to_cpu(fh
[1]);
53 this.no_addr
= ((uint64_t)be32_to_cpu(fh
[2])) << 32;
54 this.no_addr
|= be32_to_cpu(fh
[3]);
60 return gfs2_export_ops
.find_exported_dentry(sb
, &this, &parent
,
64 static int gfs2_encode_fh(struct dentry
*dentry
, __u32
*fh
, int *len
,
67 struct inode
*inode
= dentry
->d_inode
;
68 struct super_block
*sb
= inode
->i_sb
;
69 struct gfs2_inode
*ip
= GFS2_I(inode
);
71 if (*len
< 4 || (connectable
&& *len
< 8))
74 fh
[0] = ip
->i_num
.no_formal_ino
>> 32;
75 fh
[0] = cpu_to_be32(fh
[0]);
76 fh
[1] = ip
->i_num
.no_formal_ino
& 0xFFFFFFFF;
77 fh
[1] = cpu_to_be32(fh
[1]);
78 fh
[2] = ip
->i_num
.no_addr
>> 32;
79 fh
[2] = cpu_to_be32(fh
[2]);
80 fh
[3] = ip
->i_num
.no_addr
& 0xFFFFFFFF;
81 fh
[3] = cpu_to_be32(fh
[3]);
84 if (!connectable
|| inode
== sb
->s_root
->d_inode
)
87 spin_lock(&dentry
->d_lock
);
88 inode
= dentry
->d_parent
->d_inode
;
91 spin_unlock(&dentry
->d_lock
);
93 fh
[4] = ip
->i_num
.no_formal_ino
>> 32;
94 fh
[4] = cpu_to_be32(fh
[4]);
95 fh
[5] = ip
->i_num
.no_formal_ino
& 0xFFFFFFFF;
96 fh
[5] = cpu_to_be32(fh
[5]);
97 fh
[6] = ip
->i_num
.no_addr
>> 32;
98 fh
[6] = cpu_to_be32(fh
[6]);
99 fh
[7] = ip
->i_num
.no_addr
& 0xFFFFFFFF;
100 fh
[7] = cpu_to_be32(fh
[7]);
108 struct get_name_filldir
{
109 struct gfs2_inum inum
;
113 static int get_name_filldir(void *opaque
, const char *name
, unsigned int length
,
114 uint64_t offset
, struct gfs2_inum
*inum
,
117 struct get_name_filldir
*gnfd
= (struct get_name_filldir
*)opaque
;
119 if (!gfs2_inum_equal(inum
, &gnfd
->inum
))
122 memcpy(gnfd
->name
, name
, length
);
123 gnfd
->name
[length
] = 0;
128 static int gfs2_get_name(struct dentry
*parent
, char *name
,
129 struct dentry
*child
)
131 struct inode
*dir
= parent
->d_inode
;
132 struct inode
*inode
= child
->d_inode
;
133 struct gfs2_inode
*dip
, *ip
;
134 struct get_name_filldir gnfd
;
135 struct gfs2_holder gh
;
142 if (!S_ISDIR(dir
->i_mode
) || !inode
)
149 gnfd
.inum
= ip
->i_num
;
152 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
156 error
= gfs2_dir_read(dir
, &offset
, &gnfd
, get_name_filldir
);
158 gfs2_glock_dq_uninit(&gh
);
160 if (!error
&& !*name
)
166 static struct dentry
*gfs2_get_parent(struct dentry
*child
)
170 struct dentry
*dentry
;
172 gfs2_str2qstr(&dotdot
, "..");
173 inode
= gfs2_lookupi(child
->d_inode
, &dotdot
, 1, NULL
);
176 return ERR_PTR(-ENOENT
);
178 return ERR_PTR(PTR_ERR(inode
));
180 dentry
= d_alloc_anon(inode
);
183 return ERR_PTR(-ENOMEM
);
189 static struct dentry
*gfs2_get_dentry(struct super_block
*sb
, void *inum_p
)
191 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
192 struct gfs2_inum
*inum
= inum_p
;
193 struct gfs2_holder i_gh
, ri_gh
, rgd_gh
;
194 struct gfs2_rgrpd
*rgd
;
196 struct dentry
*dentry
;
201 inode
= gfs2_ilookup(sb
, inum
);
203 if (GFS2_I(inode
)->i_num
.no_formal_ino
!= inum
->no_formal_ino
) {
205 return ERR_PTR(-ESTALE
);
210 error
= gfs2_glock_nq_num(sdp
, inum
->no_addr
, &gfs2_inode_glops
,
211 LM_ST_SHARED
, LM_FLAG_ANY
| GL_LOCAL_EXCL
,
214 return ERR_PTR(error
);
216 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
221 rgd
= gfs2_blk2rgrpd(sdp
, inum
->no_addr
);
225 error
= gfs2_glock_nq_init(rgd
->rd_gl
, LM_ST_SHARED
, 0, &rgd_gh
);
230 if (gfs2_get_block_type(rgd
, inum
->no_addr
) != GFS2_BLKST_DINODE
)
233 gfs2_glock_dq_uninit(&rgd_gh
);
234 gfs2_glock_dq_uninit(&ri_gh
);
236 inode
= gfs2_inode_lookup(sb
, inum
, DT_UNKNOWN
);
240 error
= PTR_ERR(inode
);
244 error
= gfs2_inode_refresh(GFS2_I(inode
));
251 if (GFS2_I(inode
)->i_di
.di_flags
& GFS2_DIF_SYSTEM
) {
256 gfs2_glock_dq_uninit(&i_gh
);
259 dentry
= d_alloc_anon(inode
);
262 return ERR_PTR(-ENOMEM
);
268 gfs2_glock_dq_uninit(&rgd_gh
);
271 gfs2_glock_dq_uninit(&ri_gh
);
274 gfs2_glock_dq_uninit(&i_gh
);
275 return ERR_PTR(error
);
278 struct export_operations gfs2_export_ops
= {
279 .decode_fh
= gfs2_decode_fh
,
280 .encode_fh
= gfs2_encode_fh
,
281 .get_name
= gfs2_get_name
,
282 .get_parent
= gfs2_get_parent
,
283 .get_dentry
= gfs2_get_dentry
,