~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 dentry *dentry, __u32 *p, int *len,
 32                           int connectable)
 33 {
 34         __be32 *fh = (__force __be32 *)p;
 35         struct inode *inode = dentry->d_inode;
 36         struct super_block *sb = inode->i_sb;
 37         struct gfs2_inode *ip = GFS2_I(inode);
 38 
 39         if (connectable && (*len < GFS2_LARGE_FH_SIZE)) {
 40                 *len = GFS2_LARGE_FH_SIZE;
 41                 return 255;
 42         } else if (*len < GFS2_SMALL_FH_SIZE) {
 43                 *len = GFS2_SMALL_FH_SIZE;
 44                 return 255;
 45         }
 46 
 47         fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
 48         fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
 49         fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
 50         fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
 51         *len = GFS2_SMALL_FH_SIZE;
 52 
 53         if (!connectable || inode == sb->s_root->d_inode)
 54                 return *len;
 55 
 56         spin_lock(&dentry->d_lock);
 57         inode = dentry->d_parent->d_inode;
 58         ip = GFS2_I(inode);
 59         igrab(inode);
 60         spin_unlock(&dentry->d_lock);
 61 
 62         fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
 63         fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
 64         fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
 65         fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
 66         *len = GFS2_LARGE_FH_SIZE;
 67 
 68         iput(inode);
 69 
 70         return *len;
 71 }
 72 
 73 struct get_name_filldir {
 74         struct gfs2_inum_host inum;
 75         char *name;
 76 };
 77 
 78 static int get_name_filldir(void *opaque, const char *name, int length,
 79                             loff_t offset, u64 inum, unsigned int type)
 80 {
 81         struct get_name_filldir *gnfd = opaque;
 82 
 83         if (inum != gnfd->inum.no_addr)
 84                 return 0;
 85 
 86         memcpy(gnfd->name, name, length);
 87         gnfd->name[length] = 0;
 88 
 89         return 1;
 90 }
 91 
 92 static int gfs2_get_name(struct dentry *parent, char *name,
 93                          struct dentry *child)
 94 {
 95         struct inode *dir = parent->d_inode;
 96         struct inode *inode = child->d_inode;
 97         struct gfs2_inode *dip, *ip;
 98         struct get_name_filldir gnfd;
 99         struct gfs2_holder gh;
100         u64 offset = 0;
101         int error;
102 
103         if (!dir)
104                 return -EINVAL;
105 
106         if (!S_ISDIR(dir->i_mode) || !inode)
107                 return -EINVAL;
108 
109         dip = GFS2_I(dir);
110         ip = GFS2_I(inode);
111 
112         *name = 0;
113         gnfd.inum.no_addr = ip->i_no_addr;
114         gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
115         gnfd.name = name;
116 
117         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
118         if (error)
119                 return error;
120 
121         error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
122 
123         gfs2_glock_dq_uninit(&gh);
124 
125         if (!error && !*name)
126                 error = -ENOENT;
127 
128         return error;
129 }
130 
131 static struct dentry *gfs2_get_parent(struct dentry *child)
132 {
133         return d_obtain_alias(gfs2_lookupi(child->d_inode, &gfs2_qdotdot, 1));
134 }
135 
136 static struct dentry *gfs2_get_dentry(struct super_block *sb,
137                                       struct gfs2_inum_host *inum)
138 {
139         struct gfs2_sbd *sdp = sb->s_fs_info;
140         struct inode *inode;
141 
142         inode = gfs2_ilookup(sb, inum->no_addr, 0);
143         if (inode) {
144                 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
145                         iput(inode);
146                         return ERR_PTR(-ESTALE);
147                 }
148                 goto out_inode;
149         }
150 
151         inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
152                                     GFS2_BLKST_DINODE);
153         if (IS_ERR(inode))
154                 return ERR_CAST(inode);
155 
156 out_inode:
157         return d_obtain_alias(inode);
158 }
159 
160 static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
161                 int fh_len, int fh_type)
162 {
163         struct gfs2_inum_host this;
164         __be32 *fh = (__force __be32 *)fid->raw;
165 
166         switch (fh_type) {
167         case GFS2_SMALL_FH_SIZE:
168         case GFS2_LARGE_FH_SIZE:
169         case GFS2_OLD_FH_SIZE:
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                 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
190                 parent.no_formal_ino |= be32_to_cpu(fh[5]);
191                 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
192                 parent.no_addr |= be32_to_cpu(fh[7]);
193                 return gfs2_get_dentry(sb, &parent);
194         default:
195                 return NULL;
196         }
197 }
198 
199 const struct export_operations gfs2_export_ops = {
200         .encode_fh = gfs2_encode_fh,
201         .fh_to_dentry = gfs2_fh_to_dentry,
202         .fh_to_parent = gfs2_fh_to_parent,
203         .get_name = gfs2_get_name,
204         .get_parent = gfs2_get_parent,
205 };
206 
207 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp