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7336d0e6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b3b94faa DT |
2 | /* |
3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 4 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
5 | */ |
6 | ||
b3b94faa DT |
7 | #include <linux/spinlock.h> |
8 | #include <linux/completion.h> | |
9 | #include <linux/buffer_head.h> | |
a5694255 | 10 | #include <linux/exportfs.h> |
5c676f6d | 11 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 12 | #include <linux/crc32.h> |
b3b94faa DT |
13 | |
14 | #include "gfs2.h" | |
5c676f6d | 15 | #include "incore.h" |
b3b94faa DT |
16 | #include "dir.h" |
17 | #include "glock.h" | |
18 | #include "glops.h" | |
19 | #include "inode.h" | |
b2760583 | 20 | #include "super.h" |
b3b94faa | 21 | #include "rgrp.h" |
c752666c | 22 | #include "util.h" |
b3b94faa | 23 | |
bb8d8a6f | 24 | #define GFS2_SMALL_FH_SIZE 4 |
35dcc52e | 25 | #define GFS2_LARGE_FH_SIZE 8 |
3ebf4490 | 26 | #define GFS2_OLD_FH_SIZE 10 |
bb8d8a6f | 27 | |
b0b0382b AV |
28 | static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len, |
29 | struct inode *parent) | |
b3b94faa | 30 | { |
b44b84d7 | 31 | __be32 *fh = (__force __be32 *)p; |
c9fd4307 | 32 | struct super_block *sb = inode->i_sb; |
feaa7bba | 33 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 34 | |
b0b0382b | 35 | if (parent && (*len < GFS2_LARGE_FH_SIZE)) { |
5fe0c237 | 36 | *len = GFS2_LARGE_FH_SIZE; |
94e07a75 | 37 | return FILEID_INVALID; |
5fe0c237 AK |
38 | } else if (*len < GFS2_SMALL_FH_SIZE) { |
39 | *len = GFS2_SMALL_FH_SIZE; | |
94e07a75 | 40 | return FILEID_INVALID; |
5fe0c237 | 41 | } |
b3b94faa | 42 | |
dbb7cae2 SW |
43 | fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
44 | fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
45 | fh[2] = cpu_to_be32(ip->i_no_addr >> 32); | |
46 | fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 47 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 48 | |
2b0143b5 | 49 | if (!parent || inode == d_inode(sb->s_root)) |
b3b94faa DT |
50 | return *len; |
51 | ||
b0b0382b | 52 | ip = GFS2_I(parent); |
b3b94faa | 53 | |
dbb7cae2 SW |
54 | fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
55 | fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
56 | fh[6] = cpu_to_be32(ip->i_no_addr >> 32); | |
57 | fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 58 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 59 | |
b3b94faa DT |
60 | return *len; |
61 | } | |
62 | ||
63 | struct get_name_filldir { | |
d81a8ef5 | 64 | struct dir_context ctx; |
629a21e7 | 65 | struct gfs2_inum_host inum; |
b3b94faa DT |
66 | char *name; |
67 | }; | |
68 | ||
ac7576f4 MS |
69 | static int get_name_filldir(struct dir_context *ctx, const char *name, |
70 | int length, loff_t offset, u64 inum, | |
71 | unsigned int type) | |
b3b94faa | 72 | { |
ac7576f4 MS |
73 | struct get_name_filldir *gnfd = |
74 | container_of(ctx, struct get_name_filldir, ctx); | |
b3b94faa | 75 | |
3699e3a4 | 76 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
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 | { | |
2b0143b5 DH |
88 | struct inode *dir = d_inode(parent); |
89 | struct inode *inode = d_inode(child); | |
b3b94faa | 90 | struct gfs2_inode *dip, *ip; |
ac6614b7 AV |
91 | struct get_name_filldir gnfd = { |
92 | .ctx.actor = get_name_filldir, | |
93 | .name = name | |
94 | }; | |
b3b94faa | 95 | struct gfs2_holder gh; |
b3b94faa | 96 | int error; |
dfe4d34b | 97 | struct file_ra_state f_ra = { .start = 0 }; |
b3b94faa DT |
98 | |
99 | if (!dir) | |
100 | return -EINVAL; | |
101 | ||
b3b94faa DT |
102 | if (!S_ISDIR(dir->i_mode) || !inode) |
103 | return -EINVAL; | |
104 | ||
feaa7bba SW |
105 | dip = GFS2_I(dir); |
106 | ip = GFS2_I(inode); | |
b3b94faa DT |
107 | |
108 | *name = 0; | |
dbb7cae2 SW |
109 | gnfd.inum.no_addr = ip->i_no_addr; |
110 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; | |
b3b94faa DT |
111 | |
112 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); | |
113 | if (error) | |
114 | return error; | |
115 | ||
d81a8ef5 | 116 | error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra); |
b3b94faa DT |
117 | |
118 | gfs2_glock_dq_uninit(&gh); | |
119 | ||
120 | if (!error && !*name) | |
121 | error = -ENOENT; | |
122 | ||
123 | return error; | |
124 | } | |
125 | ||
126 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
127 | { | |
2b0143b5 | 128 | return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1)); |
b3b94faa DT |
129 | } |
130 | ||
34c0d154 | 131 | static struct dentry *gfs2_get_dentry(struct super_block *sb, |
acf7e244 | 132 | struct gfs2_inum_host *inum) |
b3b94faa | 133 | { |
5c676f6d | 134 | struct gfs2_sbd *sdp = sb->s_fs_info; |
b3b94faa | 135 | struct inode *inode; |
b3b94faa | 136 | |
6bdcadea AG |
137 | if (!inum->no_formal_ino) |
138 | return ERR_PTR(-ESTALE); | |
139 | inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino, | |
044b9414 SW |
140 | GFS2_BLKST_DINODE); |
141 | if (IS_ERR(inode)) | |
142 | return ERR_CAST(inode); | |
41ced6dc | 143 | return d_obtain_alias(inode); |
b3b94faa DT |
144 | } |
145 | ||
34c0d154 CH |
146 | static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
147 | int fh_len, int fh_type) | |
148 | { | |
149 | struct gfs2_inum_host this; | |
150 | __be32 *fh = (__force __be32 *)fid->raw; | |
151 | ||
152 | switch (fh_type) { | |
153 | case GFS2_SMALL_FH_SIZE: | |
154 | case GFS2_LARGE_FH_SIZE: | |
155 | case GFS2_OLD_FH_SIZE: | |
35c2a7f4 HD |
156 | if (fh_len < GFS2_SMALL_FH_SIZE) |
157 | return NULL; | |
34c0d154 CH |
158 | this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; |
159 | this.no_formal_ino |= be32_to_cpu(fh[1]); | |
160 | this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; | |
161 | this.no_addr |= be32_to_cpu(fh[3]); | |
162 | return gfs2_get_dentry(sb, &this); | |
163 | default: | |
164 | return NULL; | |
165 | } | |
166 | } | |
167 | ||
168 | static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
169 | int fh_len, int fh_type) | |
170 | { | |
171 | struct gfs2_inum_host parent; | |
172 | __be32 *fh = (__force __be32 *)fid->raw; | |
173 | ||
174 | switch (fh_type) { | |
175 | case GFS2_LARGE_FH_SIZE: | |
176 | case GFS2_OLD_FH_SIZE: | |
35c2a7f4 HD |
177 | if (fh_len < GFS2_LARGE_FH_SIZE) |
178 | return NULL; | |
34c0d154 CH |
179 | parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; |
180 | parent.no_formal_ino |= be32_to_cpu(fh[5]); | |
181 | parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; | |
182 | parent.no_addr |= be32_to_cpu(fh[7]); | |
183 | return gfs2_get_dentry(sb, &parent); | |
184 | default: | |
185 | return NULL; | |
186 | } | |
187 | } | |
188 | ||
39655164 | 189 | const struct export_operations gfs2_export_ops = { |
b3b94faa | 190 | .encode_fh = gfs2_encode_fh, |
34c0d154 CH |
191 | .fh_to_dentry = gfs2_fh_to_dentry, |
192 | .fh_to_parent = gfs2_fh_to_parent, | |
b3b94faa DT |
193 | .get_name = gfs2_get_name, |
194 | .get_parent = gfs2_get_parent, | |
b3b94faa DT |
195 | }; |
196 |