David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 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 |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 10 | #include <linux/spinlock.h> |
| 11 | #include <linux/completion.h> |
| 12 | #include <linux/buffer_head.h> |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 13 | #include <linux/exportfs.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 14 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 15 | #include <linux/crc32.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 16 | |
| 17 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 18 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 19 | #include "dir.h" |
| 20 | #include "glock.h" |
| 21 | #include "glops.h" |
| 22 | #include "inode.h" |
Steven Whitehouse | b276058 | 2008-10-14 16:05:55 +0100 | [diff] [blame] | 23 | #include "super.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 24 | #include "rgrp.h" |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 25 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 26 | |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 27 | #define GFS2_SMALL_FH_SIZE 4 |
Wendy Cheng | 35dcc52 | 2007-06-27 17:07:53 -0400 | [diff] [blame] | 28 | #define GFS2_LARGE_FH_SIZE 8 |
Steven Whitehouse | 3ebf449 | 2007-07-10 12:28:27 +0100 | [diff] [blame] | 29 | #define GFS2_OLD_FH_SIZE 10 |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 30 | |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 31 | static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len, |
| 32 | struct inode *parent) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 33 | { |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 34 | __be32 *fh = (__force __be32 *)p; |
Steven Whitehouse | c9fd430 | 2006-03-01 15:31:02 -0500 | [diff] [blame] | 35 | struct super_block *sb = inode->i_sb; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 36 | struct gfs2_inode *ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 38 | if (parent && (*len < GFS2_LARGE_FH_SIZE)) { |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 39 | *len = GFS2_LARGE_FH_SIZE; |
Namjae Jeon | 94e07a75 | 2013-02-17 15:48:11 +0900 | [diff] [blame] | 40 | return FILEID_INVALID; |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 41 | } else if (*len < GFS2_SMALL_FH_SIZE) { |
| 42 | *len = GFS2_SMALL_FH_SIZE; |
Namjae Jeon | 94e07a75 | 2013-02-17 15:48:11 +0900 | [diff] [blame] | 43 | return FILEID_INVALID; |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 44 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 45 | |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 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); |
Steven Whitehouse | 5acd396 | 2006-09-04 16:16:45 -0400 | [diff] [blame] | 50 | *len = GFS2_SMALL_FH_SIZE; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 51 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 52 | if (!parent || inode == d_inode(sb->s_root)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 53 | return *len; |
| 54 | |
Al Viro | b0b0382 | 2012-04-02 14:34:06 -0400 | [diff] [blame] | 55 | ip = GFS2_I(parent); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 56 | |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 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); |
Steven Whitehouse | 5acd396 | 2006-09-04 16:16:45 -0400 | [diff] [blame] | 61 | *len = GFS2_LARGE_FH_SIZE; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 62 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 63 | return *len; |
| 64 | } |
| 65 | |
| 66 | struct get_name_filldir { |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 67 | struct dir_context ctx; |
Al Viro | 629a21e | 2006-10-13 22:51:24 -0400 | [diff] [blame] | 68 | struct gfs2_inum_host inum; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 69 | char *name; |
| 70 | }; |
| 71 | |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 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) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | { |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 76 | struct get_name_filldir *gnfd = |
| 77 | container_of(ctx, struct get_name_filldir, ctx); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 78 | |
Steven Whitehouse | 3699e3a | 2007-01-17 15:09:20 +0000 | [diff] [blame] | 79 | if (inum != gnfd->inum.no_addr) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 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 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 91 | struct inode *dir = d_inode(parent); |
| 92 | struct inode *inode = d_inode(child); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 93 | struct gfs2_inode *dip, *ip; |
Al Viro | ac6614b | 2013-05-22 22:22:04 -0400 | [diff] [blame] | 94 | struct get_name_filldir gnfd = { |
| 95 | .ctx.actor = get_name_filldir, |
| 96 | .name = name |
| 97 | }; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 98 | struct gfs2_holder gh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 99 | int error; |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 100 | struct file_ra_state f_ra = { .start = 0 }; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 101 | |
| 102 | if (!dir) |
| 103 | return -EINVAL; |
| 104 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 105 | if (!S_ISDIR(dir->i_mode) || !inode) |
| 106 | return -EINVAL; |
| 107 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 108 | dip = GFS2_I(dir); |
| 109 | ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 110 | |
| 111 | *name = 0; |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 112 | gnfd.inum.no_addr = ip->i_no_addr; |
| 113 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 114 | |
| 115 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); |
| 116 | if (error) |
| 117 | return error; |
| 118 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 119 | error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 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 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 131 | return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 132 | } |
| 133 | |
Christoph Hellwig | 34c0d15 | 2007-10-21 16:42:14 -0700 | [diff] [blame] | 134 | static struct dentry *gfs2_get_dentry(struct super_block *sb, |
Steven Whitehouse | acf7e24 | 2009-09-08 18:00:30 +0100 | [diff] [blame] | 135 | struct gfs2_inum_host *inum) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 136 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 137 | struct gfs2_sbd *sdp = sb->s_fs_info; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 138 | struct inode *inode; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 139 | |
Bob Peterson | ff34245 | 2015-03-27 08:25:41 -0500 | [diff] [blame] | 140 | inode = gfs2_ilookup(sb, inum->no_addr); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 141 | if (inode) { |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 142 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 143 | iput(inode); |
| 144 | return ERR_PTR(-ESTALE); |
| 145 | } |
| 146 | goto out_inode; |
| 147 | } |
| 148 | |
Steven Whitehouse | 044b941 | 2010-11-03 20:01:07 +0000 | [diff] [blame] | 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); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 153 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 154 | out_inode: |
Al Viro | 41ced6d | 2010-12-18 12:06:56 -0500 | [diff] [blame] | 155 | return d_obtain_alias(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 156 | } |
| 157 | |
Christoph Hellwig | 34c0d15 | 2007-10-21 16:42:14 -0700 | [diff] [blame] | 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: |
Hugh Dickins | 35c2a7f | 2012-10-07 20:32:51 -0700 | [diff] [blame] | 168 | if (fh_len < GFS2_SMALL_FH_SIZE) |
| 169 | return NULL; |
Christoph Hellwig | 34c0d15 | 2007-10-21 16:42:14 -0700 | [diff] [blame] | 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: |
Hugh Dickins | 35c2a7f | 2012-10-07 20:32:51 -0700 | [diff] [blame] | 189 | if (fh_len < GFS2_LARGE_FH_SIZE) |
| 190 | return NULL; |
Christoph Hellwig | 34c0d15 | 2007-10-21 16:42:14 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 201 | const struct export_operations gfs2_export_ops = { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 202 | .encode_fh = gfs2_encode_fh, |
Christoph Hellwig | 34c0d15 | 2007-10-21 16:42:14 -0700 | [diff] [blame] | 203 | .fh_to_dentry = gfs2_fh_to_dentry, |
| 204 | .fh_to_parent = gfs2_fh_to_parent, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 205 | .get_name = gfs2_get_name, |
| 206 | .get_parent = gfs2_get_parent, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 207 | }; |
| 208 | |