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/gfs2_ondisk.h>
15 #include <linux/crc32.h>
16 #include <linux/lm_interface.h>
24 #include "ops_dentry.h"
25 #include "ops_fstype.h"
29 #define GFS2_SMALL_FH_SIZE 4
30 #define GFS2_LARGE_FH_SIZE 8
32 static struct dentry *gfs2_decode_fh(struct super_block *sb,
36 int (*acceptable)(void *context,
37 struct dentry *dentry),
40 __be32 *fh = (__force __be32 *)p;
41 struct gfs2_inum_host inum, parent;
43 memset(&parent, 0, sizeof(struct gfs2_inum));
46 case GFS2_LARGE_FH_SIZE:
47 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
48 parent.no_formal_ino |= be32_to_cpu(fh[5]);
49 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
50 parent.no_addr |= be32_to_cpu(fh[7]);
51 case GFS2_SMALL_FH_SIZE:
52 inum.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
53 inum.no_formal_ino |= be32_to_cpu(fh[1]);
54 inum.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
55 inum.no_addr |= be32_to_cpu(fh[3]);
61 return gfs2_export_ops.find_exported_dentry(sb, &inum, &parent,
65 static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
68 __be32 *fh = (__force __be32 *)p;
69 struct inode *inode = dentry->d_inode;
70 struct super_block *sb = inode->i_sb;
71 struct gfs2_inode *ip = GFS2_I(inode);
73 if (*len < GFS2_SMALL_FH_SIZE ||
74 (connectable && *len < GFS2_LARGE_FH_SIZE))
77 fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
78 fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
79 fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
80 fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
81 *len = GFS2_SMALL_FH_SIZE;
83 if (!connectable || inode == sb->s_root->d_inode)
86 spin_lock(&dentry->d_lock);
87 inode = dentry->d_parent->d_inode;
90 spin_unlock(&dentry->d_lock);
92 fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
93 fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
94 fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
95 fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
96 *len = GFS2_LARGE_FH_SIZE;
103 struct get_name_filldir {
104 struct gfs2_inum_host inum;
108 static int get_name_filldir(void *opaque, const char *name, int length,
109 loff_t offset, u64 inum, unsigned int type)
111 struct get_name_filldir *gnfd = opaque;
113 if (inum != gnfd->inum.no_addr)
116 memcpy(gnfd->name, name, length);
117 gnfd->name[length] = 0;
122 static int gfs2_get_name(struct dentry *parent, char *name,
123 struct dentry *child)
125 struct inode *dir = parent->d_inode;
126 struct inode *inode = child->d_inode;
127 struct gfs2_inode *dip, *ip;
128 struct get_name_filldir gnfd;
129 struct gfs2_holder gh;
136 if (!S_ISDIR(dir->i_mode) || !inode)
143 gnfd.inum.no_addr = ip->i_no_addr;
144 gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
147 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
151 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
153 gfs2_glock_dq_uninit(&gh);
155 if (!error && !*name)
161 static struct dentry *gfs2_get_parent(struct dentry *child)
165 struct dentry *dentry;
167 gfs2_str2qstr(&dotdot, "..");
168 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
171 return ERR_PTR(-ENOENT);
173 * In case of an error, @inode carries the error value, and we
174 * have to return that as a(n invalid) pointer to dentry.
177 return ERR_PTR(PTR_ERR(inode));
179 dentry = d_alloc_anon(inode);
182 return ERR_PTR(-ENOMEM);
185 dentry->d_op = &gfs2_dops;
189 static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
191 struct gfs2_sbd *sdp = sb->s_fs_info;
192 struct gfs2_inum_host *inum = inum_obj;
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->no_addr);
203 if (GFS2_I(inode)->i_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, &i_gh);
213 return ERR_PTR(error);
215 error = gfs2_rindex_hold(sdp, &ri_gh);
220 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
224 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
229 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
232 gfs2_glock_dq_uninit(&rgd_gh);
233 gfs2_glock_dq_uninit(&ri_gh);
235 inode = gfs2_inode_lookup(sb, DT_UNKNOWN,
241 error = PTR_ERR(inode);
245 error = gfs2_inode_refresh(GFS2_I(inode));
251 /* Pick up the works we bypass in gfs2_inode_lookup */
252 if (inode->i_state & I_NEW)
255 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
261 if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
266 gfs2_glock_dq_uninit(&i_gh);
269 dentry = d_alloc_anon(inode);
272 return ERR_PTR(-ENOMEM);
275 dentry->d_op = &gfs2_dops;
279 gfs2_glock_dq_uninit(&rgd_gh);
282 gfs2_glock_dq_uninit(&ri_gh);
285 gfs2_glock_dq_uninit(&i_gh);
286 return ERR_PTR(error);
289 struct export_operations gfs2_export_ops = {
290 .decode_fh = gfs2_decode_fh,
291 .encode_fh = gfs2_encode_fh,
292 .get_name = gfs2_get_name,
293 .get_parent = gfs2_get_parent,
294 .get_dentry = gfs2_get_dentry,