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 version 2.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/exportfs.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <linux/crc32.h>
17 #include <linux/lm_interface.h>
25 #include "ops_dentry.h"
26 #include "ops_fstype.h"
30 #define GFS2_SMALL_FH_SIZE 4
31 #define GFS2_LARGE_FH_SIZE 8
32 #define GFS2_OLD_FH_SIZE 10
34 static struct dentry
*gfs2_decode_fh(struct super_block
*sb
,
38 int (*acceptable
)(void *context
,
39 struct dentry
*dentry
),
42 __be32
*fh
= (__force __be32
*)p
;
43 struct gfs2_inum_host inum
, parent
;
45 memset(&parent
, 0, sizeof(struct gfs2_inum
));
48 case GFS2_LARGE_FH_SIZE
:
49 case GFS2_OLD_FH_SIZE
:
50 parent
.no_formal_ino
= ((u64
)be32_to_cpu(fh
[4])) << 32;
51 parent
.no_formal_ino
|= be32_to_cpu(fh
[5]);
52 parent
.no_addr
= ((u64
)be32_to_cpu(fh
[6])) << 32;
53 parent
.no_addr
|= be32_to_cpu(fh
[7]);
54 case GFS2_SMALL_FH_SIZE
:
55 inum
.no_formal_ino
= ((u64
)be32_to_cpu(fh
[0])) << 32;
56 inum
.no_formal_ino
|= be32_to_cpu(fh
[1]);
57 inum
.no_addr
= ((u64
)be32_to_cpu(fh
[2])) << 32;
58 inum
.no_addr
|= be32_to_cpu(fh
[3]);
64 return gfs2_export_ops
.find_exported_dentry(sb
, &inum
, &parent
,
68 static int gfs2_encode_fh(struct dentry
*dentry
, __u32
*p
, int *len
,
71 __be32
*fh
= (__force __be32
*)p
;
72 struct inode
*inode
= dentry
->d_inode
;
73 struct super_block
*sb
= inode
->i_sb
;
74 struct gfs2_inode
*ip
= GFS2_I(inode
);
76 if (*len
< GFS2_SMALL_FH_SIZE
||
77 (connectable
&& *len
< GFS2_LARGE_FH_SIZE
))
80 fh
[0] = cpu_to_be32(ip
->i_no_formal_ino
>> 32);
81 fh
[1] = cpu_to_be32(ip
->i_no_formal_ino
& 0xFFFFFFFF);
82 fh
[2] = cpu_to_be32(ip
->i_no_addr
>> 32);
83 fh
[3] = cpu_to_be32(ip
->i_no_addr
& 0xFFFFFFFF);
84 *len
= GFS2_SMALL_FH_SIZE
;
86 if (!connectable
|| inode
== sb
->s_root
->d_inode
)
89 spin_lock(&dentry
->d_lock
);
90 inode
= dentry
->d_parent
->d_inode
;
93 spin_unlock(&dentry
->d_lock
);
95 fh
[4] = cpu_to_be32(ip
->i_no_formal_ino
>> 32);
96 fh
[5] = cpu_to_be32(ip
->i_no_formal_ino
& 0xFFFFFFFF);
97 fh
[6] = cpu_to_be32(ip
->i_no_addr
>> 32);
98 fh
[7] = cpu_to_be32(ip
->i_no_addr
& 0xFFFFFFFF);
99 *len
= GFS2_LARGE_FH_SIZE
;
106 struct get_name_filldir
{
107 struct gfs2_inum_host inum
;
111 static int get_name_filldir(void *opaque
, const char *name
, int length
,
112 loff_t offset
, u64 inum
, unsigned int type
)
114 struct get_name_filldir
*gnfd
= opaque
;
116 if (inum
!= gnfd
->inum
.no_addr
)
119 memcpy(gnfd
->name
, name
, length
);
120 gnfd
->name
[length
] = 0;
125 static int gfs2_get_name(struct dentry
*parent
, char *name
,
126 struct dentry
*child
)
128 struct inode
*dir
= parent
->d_inode
;
129 struct inode
*inode
= child
->d_inode
;
130 struct gfs2_inode
*dip
, *ip
;
131 struct get_name_filldir gnfd
;
132 struct gfs2_holder gh
;
139 if (!S_ISDIR(dir
->i_mode
) || !inode
)
146 gnfd
.inum
.no_addr
= ip
->i_no_addr
;
147 gnfd
.inum
.no_formal_ino
= ip
->i_no_formal_ino
;
150 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, &gh
);
154 error
= gfs2_dir_read(dir
, &offset
, &gnfd
, get_name_filldir
);
156 gfs2_glock_dq_uninit(&gh
);
158 if (!error
&& !*name
)
164 static struct dentry
*gfs2_get_parent(struct dentry
*child
)
168 struct dentry
*dentry
;
170 gfs2_str2qstr(&dotdot
, "..");
171 inode
= gfs2_lookupi(child
->d_inode
, &dotdot
, 1, NULL
);
174 return ERR_PTR(-ENOENT
);
176 * In case of an error, @inode carries the error value, and we
177 * have to return that as a(n invalid) pointer to dentry.
180 return ERR_PTR(PTR_ERR(inode
));
182 dentry
= d_alloc_anon(inode
);
185 return ERR_PTR(-ENOMEM
);
188 dentry
->d_op
= &gfs2_dops
;
192 static struct dentry
*gfs2_get_dentry(struct super_block
*sb
, void *inum_obj
)
194 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
195 struct gfs2_inum_host
*inum
= inum_obj
;
196 struct gfs2_holder i_gh
, ri_gh
, rgd_gh
;
197 struct gfs2_rgrpd
*rgd
;
199 struct dentry
*dentry
;
204 inode
= gfs2_ilookup(sb
, inum
->no_addr
);
206 if (GFS2_I(inode
)->i_no_formal_ino
!= inum
->no_formal_ino
) {
208 return ERR_PTR(-ESTALE
);
213 error
= gfs2_glock_nq_num(sdp
, inum
->no_addr
, &gfs2_inode_glops
,
214 LM_ST_SHARED
, LM_FLAG_ANY
, &i_gh
);
216 return ERR_PTR(error
);
218 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
223 rgd
= gfs2_blk2rgrpd(sdp
, inum
->no_addr
);
227 error
= gfs2_glock_nq_init(rgd
->rd_gl
, LM_ST_SHARED
, 0, &rgd_gh
);
232 if (gfs2_get_block_type(rgd
, inum
->no_addr
) != GFS2_BLKST_DINODE
)
235 gfs2_glock_dq_uninit(&rgd_gh
);
236 gfs2_glock_dq_uninit(&ri_gh
);
238 inode
= gfs2_inode_lookup(sb
, DT_UNKNOWN
,
244 error
= PTR_ERR(inode
);
248 error
= gfs2_inode_refresh(GFS2_I(inode
));
254 /* Pick up the works we bypass in gfs2_inode_lookup */
255 if (inode
->i_state
& I_NEW
)
258 if (GFS2_I(inode
)->i_no_formal_ino
!= inum
->no_formal_ino
) {
264 if (GFS2_I(inode
)->i_di
.di_flags
& GFS2_DIF_SYSTEM
) {
269 gfs2_glock_dq_uninit(&i_gh
);
272 dentry
= d_alloc_anon(inode
);
275 return ERR_PTR(-ENOMEM
);
278 dentry
->d_op
= &gfs2_dops
;
282 gfs2_glock_dq_uninit(&rgd_gh
);
285 gfs2_glock_dq_uninit(&ri_gh
);
288 gfs2_glock_dq_uninit(&i_gh
);
289 return ERR_PTR(error
);
292 struct export_operations gfs2_export_ops
= {
293 .decode_fh
= gfs2_decode_fh
,
294 .encode_fh
= gfs2_encode_fh
,
295 .get_name
= gfs2_get_name
,
296 .get_parent
= gfs2_get_parent
,
297 .get_dentry
= gfs2_get_dentry
,