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>
17 #include <linux/lm_interface.h>
25 #include "ops_dentry.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 __be32 *fh = (__force __be32 *)p;
39 struct gfs2_fh_obj fh_obj;
40 struct gfs2_inum_host *this, parent;
42 if (fh_type != fh_len)
46 fh_obj.imode = DT_UNKNOWN;
47 memset(&parent, 0, sizeof(struct gfs2_inum));
50 case GFS2_LARGE_FH_SIZE:
51 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
52 parent.no_formal_ino |= be32_to_cpu(fh[5]);
53 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
54 parent.no_addr |= be32_to_cpu(fh[7]);
55 fh_obj.imode = be32_to_cpu(fh[8]);
56 case GFS2_SMALL_FH_SIZE:
57 this->no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
58 this->no_formal_ino |= be32_to_cpu(fh[1]);
59 this->no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
60 this->no_addr |= be32_to_cpu(fh[3]);
66 return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent,
70 static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
73 __be32 *fh = (__force __be32 *)p;
74 struct inode *inode = dentry->d_inode;
75 struct super_block *sb = inode->i_sb;
76 struct gfs2_inode *ip = GFS2_I(inode);
78 if (*len < GFS2_SMALL_FH_SIZE ||
79 (connectable && *len < GFS2_LARGE_FH_SIZE))
82 fh[0] = cpu_to_be32(ip->i_num.no_formal_ino >> 32);
83 fh[1] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF);
84 fh[2] = cpu_to_be32(ip->i_num.no_addr >> 32);
85 fh[3] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF);
86 *len = GFS2_SMALL_FH_SIZE;
88 if (!connectable || inode == sb->s_root->d_inode)
91 spin_lock(&dentry->d_lock);
92 inode = dentry->d_parent->d_inode;
95 spin_unlock(&dentry->d_lock);
97 fh[4] = cpu_to_be32(ip->i_num.no_formal_ino >> 32);
98 fh[5] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF);
99 fh[6] = cpu_to_be32(ip->i_num.no_addr >> 32);
100 fh[7] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF);
102 fh[8] = cpu_to_be32(inode->i_mode);
103 fh[9] = 0; /* pad to double word */
104 *len = GFS2_LARGE_FH_SIZE;
111 struct get_name_filldir {
112 struct gfs2_inum_host inum;
116 static int get_name_filldir(void *opaque, const char *name, unsigned int length,
117 u64 offset, struct gfs2_inum_host *inum,
120 struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque;
122 if (!gfs2_inum_equal(inum, &gnfd->inum))
125 memcpy(gnfd->name, name, length);
126 gnfd->name[length] = 0;
131 static int gfs2_get_name(struct dentry *parent, char *name,
132 struct dentry *child)
134 struct inode *dir = parent->d_inode;
135 struct inode *inode = child->d_inode;
136 struct gfs2_inode *dip, *ip;
137 struct get_name_filldir gnfd;
138 struct gfs2_holder gh;
145 if (!S_ISDIR(dir->i_mode) || !inode)
152 gnfd.inum = ip->i_num;
155 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
159 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
161 gfs2_glock_dq_uninit(&gh);
163 if (!error && !*name)
169 static struct dentry *gfs2_get_parent(struct dentry *child)
173 struct dentry *dentry;
175 gfs2_str2qstr(&dotdot, "..");
176 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
179 return ERR_PTR(-ENOENT);
181 * In case of an error, @inode carries the error value, and we
182 * have to return that as a(n invalid) pointer to dentry.
185 return ERR_PTR(PTR_ERR(inode));
187 dentry = d_alloc_anon(inode);
190 return ERR_PTR(-ENOMEM);
193 dentry->d_op = &gfs2_dops;
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_host *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);
274 dentry->d_op = &gfs2_dops;
278 gfs2_glock_dq_uninit(&rgd_gh);
281 gfs2_glock_dq_uninit(&ri_gh);
284 gfs2_glock_dq_uninit(&i_gh);
285 return ERR_PTR(error);
288 struct export_operations gfs2_export_ops = {
289 .decode_fh = gfs2_decode_fh,
290 .encode_fh = gfs2_encode_fh,
291 .get_name = gfs2_get_name,
292 .get_parent = gfs2_get_parent,
293 .get_dentry = gfs2_get_dentry,