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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 FILEID_INVALID;
 41         } else if (*len < GFS2_SMALL_FH_SIZE) {
 42                 *len = GFS2_SMALL_FH_SIZE;
 43                 return FILEID_INVALID;
 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 == d_inode(sb->s_root))
 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 dir_context ctx;
 68         struct gfs2_inum_host inum;
 69         char *name;
 70 };
 71 
 72 static int get_name_filldir(struct dir_context *ctx, const char *name,
 73                             int length, loff_t offset, u64 inum,
 74                             unsigned int type)
 75 {
 76         struct get_name_filldir *gnfd =
 77                 container_of(ctx, struct get_name_filldir, ctx);
 78 
 79         if (inum != gnfd->inum.no_addr)
 80                 return 0;
 81 
 82         memcpy(gnfd->name, name, length);
 83         gnfd->name[length] = 0;
 84 
 85         return 1;
 86 }
 87 
 88 static int gfs2_get_name(struct dentry *parent, char *name,
 89                          struct dentry *child)
 90 {
 91         struct inode *dir = d_inode(parent);
 92         struct inode *inode = d_inode(child);
 93         struct gfs2_inode *dip, *ip;
 94         struct get_name_filldir gnfd = {
 95                 .ctx.actor = get_name_filldir,
 96                 .name = name
 97         };
 98         struct gfs2_holder gh;
 99         int error;
100         struct file_ra_state f_ra = { .start = 0 };
101 
102         if (!dir)
103                 return -EINVAL;
104 
105         if (!S_ISDIR(dir->i_mode) || !inode)
106                 return -EINVAL;
107 
108         dip = GFS2_I(dir);
109         ip = GFS2_I(inode);
110 
111         *name = 0;
112         gnfd.inum.no_addr = ip->i_no_addr;
113         gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
114 
115         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
116         if (error)
117                 return error;
118 
119         error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra);
120 
121         gfs2_glock_dq_uninit(&gh);
122 
123         if (!error && !*name)
124                 error = -ENOENT;
125 
126         return error;
127 }
128 
129 static struct dentry *gfs2_get_parent(struct dentry *child)
130 {
131         return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1));
132 }
133 
134 static struct dentry *gfs2_get_dentry(struct super_block *sb,
135                                       struct gfs2_inum_host *inum)
136 {
137         struct gfs2_sbd *sdp = sb->s_fs_info;
138         struct inode *inode;
139 
140         inode = gfs2_ilookup(sb, inum->no_addr);
141         if (inode) {
142                 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
143                         iput(inode);
144                         return ERR_PTR(-ESTALE);
145                 }
146                 goto out_inode;
147         }
148 
149         inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
150                                     GFS2_BLKST_DINODE);
151         if (IS_ERR(inode))
152                 return ERR_CAST(inode);
153 
154 out_inode:
155         return d_obtain_alias(inode);
156 }
157 
158 static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
159                 int fh_len, int fh_type)
160 {
161         struct gfs2_inum_host this;
162         __be32 *fh = (__force __be32 *)fid->raw;
163 
164         switch (fh_type) {
165         case GFS2_SMALL_FH_SIZE:
166         case GFS2_LARGE_FH_SIZE:
167         case GFS2_OLD_FH_SIZE:
168                 if (fh_len < GFS2_SMALL_FH_SIZE)
169                         return NULL;
170                 this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
171                 this.no_formal_ino |= be32_to_cpu(fh[1]);
172                 this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
173                 this.no_addr |= be32_to_cpu(fh[3]);
174                 return gfs2_get_dentry(sb, &this);
175         default:
176                 return NULL;
177         }
178 }
179 
180 static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
181                 int fh_len, int fh_type)
182 {
183         struct gfs2_inum_host parent;
184         __be32 *fh = (__force __be32 *)fid->raw;
185 
186         switch (fh_type) {
187         case GFS2_LARGE_FH_SIZE:
188         case GFS2_OLD_FH_SIZE:
189                 if (fh_len < GFS2_LARGE_FH_SIZE)
190                         return NULL;
191                 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
192                 parent.no_formal_ino |= be32_to_cpu(fh[5]);
193                 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
194                 parent.no_addr |= be32_to_cpu(fh[7]);
195                 return gfs2_get_dentry(sb, &parent);
196         default:
197                 return NULL;
198         }
199 }
200 
201 const struct export_operations gfs2_export_ops = {
202         .encode_fh = gfs2_encode_fh,
203         .fh_to_dentry = gfs2_fh_to_dentry,
204         .fh_to_parent = gfs2_fh_to_parent,
205         .get_name = gfs2_get_name,
206         .get_parent = gfs2_get_parent,
207 };
208 
209 

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