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/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_fh_obj fh_obj;
38 struct gfs2_inum *this, parent;
40 if (fh_type != fh_len)
44 fh_obj.imode = DT_UNKNOWN;
45 memset(&parent, 0, sizeof(struct gfs2_inum));
48 case GFS2_LARGE_FH_SIZE:
49 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
50 parent.no_formal_ino |= be32_to_cpu(fh[5]);
51 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
52 parent.no_addr |= be32_to_cpu(fh[7]);
53 fh_obj.imode = be32_to_cpu(fh[8]);
54 case GFS2_SMALL_FH_SIZE:
55 this->no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
56 this->no_formal_ino |= be32_to_cpu(fh[1]);
57 this->no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
58 this->no_addr |= be32_to_cpu(fh[3]);
64 return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent,
68 static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
71 struct inode *inode = dentry->d_inode;
72 struct super_block *sb = inode->i_sb;
73 struct gfs2_inode *ip = GFS2_I(inode);
75 if (*len < GFS2_SMALL_FH_SIZE ||
76 (connectable && *len < GFS2_LARGE_FH_SIZE))
79 fh[0] = ip->i_num.no_formal_ino >> 32;
80 fh[0] = cpu_to_be32(fh[0]);
81 fh[1] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
82 fh[1] = cpu_to_be32(fh[1]);
83 fh[2] = ip->i_num.no_addr >> 32;
84 fh[2] = cpu_to_be32(fh[2]);
85 fh[3] = ip->i_num.no_addr & 0xFFFFFFFF;
86 fh[3] = cpu_to_be32(fh[3]);
87 *len = GFS2_SMALL_FH_SIZE;
89 if (!connectable || inode == sb->s_root->d_inode)
92 spin_lock(&dentry->d_lock);
93 inode = dentry->d_parent->d_inode;
96 spin_unlock(&dentry->d_lock);
98 fh[4] = ip->i_num.no_formal_ino >> 32;
99 fh[4] = cpu_to_be32(fh[4]);
100 fh[5] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
101 fh[5] = cpu_to_be32(fh[5]);
102 fh[6] = ip->i_num.no_addr >> 32;
103 fh[6] = cpu_to_be32(fh[6]);
104 fh[7] = ip->i_num.no_addr & 0xFFFFFFFF;
105 fh[7] = cpu_to_be32(fh[7]);
107 fh[8] = cpu_to_be32(inode->i_mode);
108 fh[9] = 0; /* pad to double word */
109 *len = GFS2_LARGE_FH_SIZE;
116 struct get_name_filldir {
117 struct gfs2_inum inum;
121 static int get_name_filldir(void *opaque, const char *name, unsigned int length,
122 u64 offset, struct gfs2_inum *inum,
125 struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque;
127 if (!gfs2_inum_equal(inum, &gnfd->inum))
130 memcpy(gnfd->name, name, length);
131 gnfd->name[length] = 0;
136 static int gfs2_get_name(struct dentry *parent, char *name,
137 struct dentry *child)
139 struct inode *dir = parent->d_inode;
140 struct inode *inode = child->d_inode;
141 struct gfs2_inode *dip, *ip;
142 struct get_name_filldir gnfd;
143 struct gfs2_holder gh;
150 if (!S_ISDIR(dir->i_mode) || !inode)
157 gnfd.inum = ip->i_num;
160 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
164 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
166 gfs2_glock_dq_uninit(&gh);
168 if (!error && !*name)
174 static struct dentry *gfs2_get_parent(struct dentry *child)
178 struct dentry *dentry;
180 gfs2_str2qstr(&dotdot, "..");
181 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
184 return ERR_PTR(-ENOENT);
186 return ERR_PTR(PTR_ERR(inode));
188 dentry = d_alloc_anon(inode);
191 return ERR_PTR(-ENOMEM);
197 static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
199 struct gfs2_sbd *sdp = sb->s_fs_info;
200 struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj;
201 struct gfs2_inum *inum = &fh_obj->this;
202 struct gfs2_holder i_gh, ri_gh, rgd_gh;
203 struct gfs2_rgrpd *rgd;
205 struct dentry *dentry;
210 inode = gfs2_ilookup(sb, inum);
212 if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) {
214 return ERR_PTR(-ESTALE);
219 error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
220 LM_ST_SHARED, LM_FLAG_ANY | GL_LOCAL_EXCL,
223 return ERR_PTR(error);
225 error = gfs2_rindex_hold(sdp, &ri_gh);
230 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
234 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
239 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
242 gfs2_glock_dq_uninit(&rgd_gh);
243 gfs2_glock_dq_uninit(&ri_gh);
245 inode = gfs2_inode_lookup(sb, inum, fh_obj->imode);
249 error = PTR_ERR(inode);
253 error = gfs2_inode_refresh(GFS2_I(inode));
260 if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
265 gfs2_glock_dq_uninit(&i_gh);
268 dentry = d_alloc_anon(inode);
271 return ERR_PTR(-ENOMEM);
277 gfs2_glock_dq_uninit(&rgd_gh);
280 gfs2_glock_dq_uninit(&ri_gh);
283 gfs2_glock_dq_uninit(&i_gh);
284 return ERR_PTR(error);
287 struct export_operations gfs2_export_ops = {
288 .decode_fh = gfs2_decode_fh,
289 .encode_fh = gfs2_encode_fh,
290 .get_name = gfs2_get_name,
291 .get_parent = gfs2_get_parent,
292 .get_dentry = gfs2_get_dentry,