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TOMOYO Linux Cross Reference
Linux/fs/gfs2/export.c

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
  4  *
  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.
  8  */
  9 
 10 #include <linux/spinlock.h>
 11 #include <linux/completion.h>
 12 #include <linux/buffer_head.h>
 13 #include <linux/exportfs.h>
 14 #include <linux/gfs2_ondisk.h>
 15 #include <linux/crc32.h>
 16 
 17 #include "gfs2.h"
 18 #include "incore.h"
 19 #include "dir.h"
 20 #include "glock.h"
 21 #include "glops.h"
 22 #include "inode.h"
 23 #include "super.h"
 24 #include "rgrp.h"
 25 #include "util.h"
 26 
 27 #define GFS2_SMALL_FH_SIZE 4
 28 #define GFS2_LARGE_FH_SIZE 8
 29 #define GFS2_OLD_FH_SIZE 10
 30 
 31 static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len,
 32                           struct inode *parent)
 33 {
 34         __be32 *fh = (__force __be32 *)p;
 35         struct super_block *sb = inode->i_sb;
 36         struct gfs2_inode *ip = GFS2_I(inode);
 37 
 38         if (parent && (*len < GFS2_LARGE_FH_SIZE)) {
 39                 *len = GFS2_LARGE_FH_SIZE;
 40                 return 255;
 41         } else if (*len < GFS2_SMALL_FH_SIZE) {
 42                 *len = GFS2_SMALL_FH_SIZE;
 43                 return 255;
 44         }
 45 
 46         fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
 47         fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
 48         fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
 49         fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
 50         *len = GFS2_SMALL_FH_SIZE;
 51 
 52         if (!parent || inode == sb->s_root->d_inode)
 53                 return *len;
 54 
 55         ip = GFS2_I(parent);
 56 
 57         fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
 58         fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
 59         fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
 60         fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
 61         *len = GFS2_LARGE_FH_SIZE;
 62 
 63         return *len;
 64 }
 65 
 66 struct get_name_filldir {
 67         struct gfs2_inum_host inum;
 68         char *name;
 69 };
 70 
 71 static int get_name_filldir(void *opaque, const char *name, int length,
 72                             loff_t offset, u64 inum, unsigned int type)
 73 {
 74         struct get_name_filldir *gnfd = opaque;
 75 
 76         if (inum != gnfd->inum.no_addr)
 77                 return 0;
 78 
 79         memcpy(gnfd->name, name, length);
 80         gnfd->name[length] = 0;
 81 
 82         return 1;
 83 }
 84 
 85 static int gfs2_get_name(struct dentry *parent, char *name,
 86                          struct dentry *child)
 87 {
 88         struct inode *dir = parent->d_inode;
 89         struct inode *inode = child->d_inode;
 90         struct gfs2_inode *dip, *ip;
 91         struct get_name_filldir gnfd;
 92         struct gfs2_holder gh;
 93         u64 offset = 0;
 94         int error;
 95         struct file_ra_state f_ra = { .start = 0 };
 96 
 97         if (!dir)
 98                 return -EINVAL;
 99 
100         if (!S_ISDIR(dir->i_mode) || !inode)
101                 return -EINVAL;
102 
103         dip = GFS2_I(dir);
104         ip = GFS2_I(inode);
105 
106         *name = 0;
107         gnfd.inum.no_addr = ip->i_no_addr;
108         gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
109         gnfd.name = name;
110 
111         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
112         if (error)
113                 return error;
114 
115         error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir, &f_ra);
116 
117         gfs2_glock_dq_uninit(&gh);
118 
119         if (!error && !*name)
120                 error = -ENOENT;
121 
122         return error;
123 }
124 
125 static struct dentry *gfs2_get_parent(struct dentry *child)
126 {
127         return d_obtain_alias(gfs2_lookupi(child->d_inode, &gfs2_qdotdot, 1));
128 }
129 
130 static struct dentry *gfs2_get_dentry(struct super_block *sb,
131                                       struct gfs2_inum_host *inum)
132 {
133         struct gfs2_sbd *sdp = sb->s_fs_info;
134         struct inode *inode;
135 
136         inode = gfs2_ilookup(sb, inum->no_addr, 0);
137         if (inode) {
138                 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
139                         iput(inode);
140                         return ERR_PTR(-ESTALE);
141                 }
142                 goto out_inode;
143         }
144 
145         inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
146                                     GFS2_BLKST_DINODE);
147         if (IS_ERR(inode))
148                 return ERR_CAST(inode);
149 
150 out_inode:
151         return d_obtain_alias(inode);
152 }
153 
154 static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
155                 int fh_len, int fh_type)
156 {
157         struct gfs2_inum_host this;
158         __be32 *fh = (__force __be32 *)fid->raw;
159 
160         switch (fh_type) {
161         case GFS2_SMALL_FH_SIZE:
162         case GFS2_LARGE_FH_SIZE:
163         case GFS2_OLD_FH_SIZE:
164                 if (fh_len < GFS2_SMALL_FH_SIZE)
165                         return NULL;
166                 this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
167                 this.no_formal_ino |= be32_to_cpu(fh[1]);
168                 this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
169                 this.no_addr |= be32_to_cpu(fh[3]);
170                 return gfs2_get_dentry(sb, &this);
171         default:
172                 return NULL;
173         }
174 }
175 
176 static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
177                 int fh_len, int fh_type)
178 {
179         struct gfs2_inum_host parent;
180         __be32 *fh = (__force __be32 *)fid->raw;
181 
182         switch (fh_type) {
183         case GFS2_LARGE_FH_SIZE:
184         case GFS2_OLD_FH_SIZE:
185                 if (fh_len < GFS2_LARGE_FH_SIZE)
186                         return NULL;
187                 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
188                 parent.no_formal_ino |= be32_to_cpu(fh[5]);
189                 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
190                 parent.no_addr |= be32_to_cpu(fh[7]);
191                 return gfs2_get_dentry(sb, &parent);
192         default:
193                 return NULL;
194         }
195 }
196 
197 const struct export_operations gfs2_export_ops = {
198         .encode_fh = gfs2_encode_fh,
199         .fh_to_dentry = gfs2_fh_to_dentry,
200         .fh_to_parent = gfs2_fh_to_parent,
201         .get_name = gfs2_get_name,
202         .get_parent = gfs2_get_parent,
203 };
204 
205 

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