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,