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_export.h"
29 static struct dentry *gfs2_decode_fh(struct super_block *sb,
33 int (*acceptable)(void *context,
34 struct dentry *dentry),
37 __be32 *fh = (__force __be32 *)p;
38 struct gfs2_fh_obj fh_obj;
39 struct gfs2_inum_host *this, parent;
42 fh_obj.imode = DT_UNKNOWN;
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 fh_obj.imode = be32_to_cpu(fh[8]);
52 case GFS2_SMALL_FH_SIZE:
53 this->no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
54 this->no_formal_ino |= be32_to_cpu(fh[1]);
55 this->no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
56 this->no_addr |= be32_to_cpu(fh[3]);
62 return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent,
66 static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
69 __be32 *fh = (__force __be32 *)p;
70 struct inode *inode = dentry->d_inode;
71 struct super_block *sb = inode->i_sb;
72 struct gfs2_inode *ip = GFS2_I(inode);
74 if (*len < GFS2_SMALL_FH_SIZE ||
75 (connectable && *len < GFS2_LARGE_FH_SIZE))
78 fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
79 fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
80 fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
81 fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
82 *len = GFS2_SMALL_FH_SIZE;
84 if (!connectable || inode == sb->s_root->d_inode)
87 spin_lock(&dentry->d_lock);
88 inode = dentry->d_parent->d_inode;
91 spin_unlock(&dentry->d_lock);
93 fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
94 fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
95 fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
96 fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
98 fh[8] = cpu_to_be32(inode->i_mode);
99 fh[9] = 0; /* pad to double word */
100 *len = GFS2_LARGE_FH_SIZE;
107 struct get_name_filldir {
108 struct gfs2_inum_host inum;
112 static int get_name_filldir(void *opaque, const char *name, int length,
113 loff_t offset, u64 inum, unsigned int type)
115 struct get_name_filldir *gnfd = opaque;
117 if (inum != gnfd->inum.no_addr)
120 memcpy(gnfd->name, name, length);
121 gnfd->name[length] = 0;
126 static int gfs2_get_name(struct dentry *parent, char *name,
127 struct dentry *child)
129 struct inode *dir = parent->d_inode;
130 struct inode *inode = child->d_inode;
131 struct gfs2_inode *dip, *ip;
132 struct get_name_filldir gnfd;
133 struct gfs2_holder gh;
140 if (!S_ISDIR(dir->i_mode) || !inode)
147 gnfd.inum.no_addr = ip->i_no_addr;
148 gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
151 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
155 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
157 gfs2_glock_dq_uninit(&gh);
159 if (!error && !*name)
165 static struct dentry *gfs2_get_parent(struct dentry *child)
169 struct dentry *dentry;
171 gfs2_str2qstr(&dotdot, "..");
172 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
175 return ERR_PTR(-ENOENT);
177 * In case of an error, @inode carries the error value, and we
178 * have to return that as a(n invalid) pointer to dentry.
181 return ERR_PTR(PTR_ERR(inode));
183 dentry = d_alloc_anon(inode);
186 return ERR_PTR(-ENOMEM);
189 dentry->d_op = &gfs2_dops;
193 static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
195 struct gfs2_sbd *sdp = sb->s_fs_info;
196 struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj;
197 struct gfs2_inum_host *inum = &fh_obj->this;
198 struct gfs2_holder i_gh, ri_gh, rgd_gh;
199 struct gfs2_rgrpd *rgd;
201 struct dentry *dentry;
206 inode = gfs2_ilookup(sb, inum->no_addr);
208 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
210 return ERR_PTR(-ESTALE);
215 error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
216 LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
218 return ERR_PTR(error);
220 error = gfs2_rindex_hold(sdp, &ri_gh);
225 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
229 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
234 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
237 gfs2_glock_dq_uninit(&rgd_gh);
238 gfs2_glock_dq_uninit(&ri_gh);
240 inode = gfs2_inode_lookup(sb, inum->no_addr, fh_obj->imode);
244 error = PTR_ERR(inode);
248 error = gfs2_inode_refresh(GFS2_I(inode));
253 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
259 if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
264 gfs2_glock_dq_uninit(&i_gh);
267 dentry = d_alloc_anon(inode);
270 return ERR_PTR(-ENOMEM);
273 dentry->d_op = &gfs2_dops;
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,