diff options
author | Matt Fleming <matt.fleming@intel.com> | 2013-02-08 11:27:24 -0500 |
---|---|---|
committer | Matt Fleming <matt.fleming@intel.com> | 2013-04-17 08:25:09 -0400 |
commit | d68772b7c83f4b518be15ae96f4827c8ed02f684 (patch) | |
tree | b3408a750976edf6e0b62bfce3e26d1c9685a907 /fs/efivarfs | |
parent | 048517722cde2595a7366d0c3c72b8b1ec142a9c (diff) |
efivarfs: Move to fs/efivarfs
Now that efivarfs uses the efivar API, move it out of efivars.c and
into fs/efivarfs where it belongs. This move will eventually allow us
to enable the efivarfs code without having to also enable
CONFIG_EFI_VARS built, and vice versa.
Furthermore, things like,
mount -t efivarfs none /sys/firmware/efi/efivars
will now work if efivarfs is built as a module without requiring the
use of MODULE_ALIAS(), which would have been necessary when the
efivarfs code was part of efivars.c.
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'fs/efivarfs')
-rw-r--r-- | fs/efivarfs/Kconfig | 12 | ||||
-rw-r--r-- | fs/efivarfs/Makefile | 7 | ||||
-rw-r--r-- | fs/efivarfs/file.c | 111 | ||||
-rw-r--r-- | fs/efivarfs/inode.c | 173 | ||||
-rw-r--r-- | fs/efivarfs/internal.h | 22 | ||||
-rw-r--r-- | fs/efivarfs/super.c | 267 |
6 files changed, 592 insertions, 0 deletions
diff --git a/fs/efivarfs/Kconfig b/fs/efivarfs/Kconfig new file mode 100644 index 000000000000..1fb2b7f849f3 --- /dev/null +++ b/fs/efivarfs/Kconfig | |||
@@ -0,0 +1,12 @@ | |||
1 | config EFIVAR_FS | ||
2 | tristate "EFI Variable filesystem" | ||
3 | depends on EFI_VARS | ||
4 | help | ||
5 | efivarfs is a replacement filesystem for the old EFI | ||
6 | variable support via sysfs, as it doesn't suffer from the | ||
7 | same 1024-byte variable size limit. | ||
8 | |||
9 | To compile this file system support as a module, choose M | ||
10 | here. The module will be called efivarfs. | ||
11 | |||
12 | If unsure, say N. | ||
diff --git a/fs/efivarfs/Makefile b/fs/efivarfs/Makefile new file mode 100644 index 000000000000..955d478177d5 --- /dev/null +++ b/fs/efivarfs/Makefile | |||
@@ -0,0 +1,7 @@ | |||
1 | # | ||
2 | # Makefile for the efivarfs filesystem | ||
3 | # | ||
4 | |||
5 | obj-$(CONFIG_EFIVAR_FS) += efivarfs.o | ||
6 | |||
7 | efivarfs-objs := inode.o file.o super.o | ||
diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c new file mode 100644 index 000000000000..aeb0368dace2 --- /dev/null +++ b/fs/efivarfs/file.c | |||
@@ -0,0 +1,111 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 Red Hat, Inc. | ||
3 | * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License version 2 as | ||
7 | * published by the Free Software Foundation. | ||
8 | */ | ||
9 | |||
10 | #include <linux/efi.h> | ||
11 | #include <linux/fs.h> | ||
12 | |||
13 | #include "internal.h" | ||
14 | |||
15 | static int efivarfs_file_open(struct inode *inode, struct file *file) | ||
16 | { | ||
17 | file->private_data = inode->i_private; | ||
18 | return 0; | ||
19 | } | ||
20 | |||
21 | static ssize_t efivarfs_file_write(struct file *file, | ||
22 | const char __user *userbuf, size_t count, loff_t *ppos) | ||
23 | { | ||
24 | struct efivar_entry *var = file->private_data; | ||
25 | void *data; | ||
26 | u32 attributes; | ||
27 | struct inode *inode = file->f_mapping->host; | ||
28 | unsigned long datasize = count - sizeof(attributes); | ||
29 | ssize_t bytes = 0; | ||
30 | bool set = false; | ||
31 | |||
32 | if (count < sizeof(attributes)) | ||
33 | return -EINVAL; | ||
34 | |||
35 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) | ||
36 | return -EFAULT; | ||
37 | |||
38 | if (attributes & ~(EFI_VARIABLE_MASK)) | ||
39 | return -EINVAL; | ||
40 | |||
41 | data = kmalloc(datasize, GFP_KERNEL); | ||
42 | if (!data) | ||
43 | return -ENOMEM; | ||
44 | |||
45 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { | ||
46 | bytes = -EFAULT; | ||
47 | goto out; | ||
48 | } | ||
49 | |||
50 | bytes = efivar_entry_set_get_size(var, attributes, &datasize, | ||
51 | data, &set); | ||
52 | if (!set && bytes) | ||
53 | goto out; | ||
54 | |||
55 | if (bytes == -ENOENT) { | ||
56 | drop_nlink(inode); | ||
57 | d_delete(file->f_dentry); | ||
58 | dput(file->f_dentry); | ||
59 | } else { | ||
60 | mutex_lock(&inode->i_mutex); | ||
61 | i_size_write(inode, datasize + sizeof(attributes)); | ||
62 | mutex_unlock(&inode->i_mutex); | ||
63 | } | ||
64 | |||
65 | bytes = count; | ||
66 | |||
67 | out: | ||
68 | kfree(data); | ||
69 | |||
70 | return bytes; | ||
71 | } | ||
72 | |||
73 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | ||
74 | size_t count, loff_t *ppos) | ||
75 | { | ||
76 | struct efivar_entry *var = file->private_data; | ||
77 | unsigned long datasize = 0; | ||
78 | u32 attributes; | ||
79 | void *data; | ||
80 | ssize_t size = 0; | ||
81 | int err; | ||
82 | |||
83 | err = efivar_entry_size(var, &datasize); | ||
84 | if (err) | ||
85 | return err; | ||
86 | |||
87 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); | ||
88 | |||
89 | if (!data) | ||
90 | return -ENOMEM; | ||
91 | |||
92 | size = efivar_entry_get(var, &attributes, &datasize, | ||
93 | data + sizeof(attributes)); | ||
94 | if (size) | ||
95 | goto out_free; | ||
96 | |||
97 | memcpy(data, &attributes, sizeof(attributes)); | ||
98 | size = simple_read_from_buffer(userbuf, count, ppos, | ||
99 | data, datasize + sizeof(attributes)); | ||
100 | out_free: | ||
101 | kfree(data); | ||
102 | |||
103 | return size; | ||
104 | } | ||
105 | |||
106 | const struct file_operations efivarfs_file_operations = { | ||
107 | .open = efivarfs_file_open, | ||
108 | .read = efivarfs_file_read, | ||
109 | .write = efivarfs_file_write, | ||
110 | .llseek = no_llseek, | ||
111 | }; | ||
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c new file mode 100644 index 000000000000..640e289d522e --- /dev/null +++ b/fs/efivarfs/inode.c | |||
@@ -0,0 +1,173 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 Red Hat, Inc. | ||
3 | * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License version 2 as | ||
7 | * published by the Free Software Foundation. | ||
8 | */ | ||
9 | |||
10 | #include <linux/efi.h> | ||
11 | #include <linux/fs.h> | ||
12 | #include <linux/ctype.h> | ||
13 | |||
14 | #include "internal.h" | ||
15 | |||
16 | struct inode *efivarfs_get_inode(struct super_block *sb, | ||
17 | const struct inode *dir, int mode, dev_t dev) | ||
18 | { | ||
19 | struct inode *inode = new_inode(sb); | ||
20 | |||
21 | if (inode) { | ||
22 | inode->i_ino = get_next_ino(); | ||
23 | inode->i_mode = mode; | ||
24 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | ||
25 | switch (mode & S_IFMT) { | ||
26 | case S_IFREG: | ||
27 | inode->i_fop = &efivarfs_file_operations; | ||
28 | break; | ||
29 | case S_IFDIR: | ||
30 | inode->i_op = &efivarfs_dir_inode_operations; | ||
31 | inode->i_fop = &simple_dir_operations; | ||
32 | inc_nlink(inode); | ||
33 | break; | ||
34 | } | ||
35 | } | ||
36 | return inode; | ||
37 | } | ||
38 | |||
39 | /* | ||
40 | * Return true if 'str' is a valid efivarfs filename of the form, | ||
41 | * | ||
42 | * VariableName-12345678-1234-1234-1234-1234567891bc | ||
43 | */ | ||
44 | bool efivarfs_valid_name(const char *str, int len) | ||
45 | { | ||
46 | static const char dashes[EFI_VARIABLE_GUID_LEN] = { | ||
47 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | ||
48 | }; | ||
49 | const char *s = str + len - EFI_VARIABLE_GUID_LEN; | ||
50 | int i; | ||
51 | |||
52 | /* | ||
53 | * We need a GUID, plus at least one letter for the variable name, | ||
54 | * plus the '-' separator | ||
55 | */ | ||
56 | if (len < EFI_VARIABLE_GUID_LEN + 2) | ||
57 | return false; | ||
58 | |||
59 | /* GUID must be preceded by a '-' */ | ||
60 | if (*(s - 1) != '-') | ||
61 | return false; | ||
62 | |||
63 | /* | ||
64 | * Validate that 's' is of the correct format, e.g. | ||
65 | * | ||
66 | * 12345678-1234-1234-1234-123456789abc | ||
67 | */ | ||
68 | for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) { | ||
69 | if (dashes[i]) { | ||
70 | if (*s++ != '-') | ||
71 | return false; | ||
72 | } else { | ||
73 | if (!isxdigit(*s++)) | ||
74 | return false; | ||
75 | } | ||
76 | } | ||
77 | |||
78 | return true; | ||
79 | } | ||
80 | |||
81 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) | ||
82 | { | ||
83 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | ||
84 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | ||
85 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | ||
86 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | ||
87 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | ||
88 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | ||
89 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | ||
90 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | ||
91 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | ||
92 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | ||
93 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | ||
94 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | ||
95 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | ||
96 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | ||
97 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | ||
98 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | ||
99 | } | ||
100 | |||
101 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | ||
102 | umode_t mode, bool excl) | ||
103 | { | ||
104 | struct inode *inode; | ||
105 | struct efivar_entry *var; | ||
106 | int namelen, i = 0, err = 0; | ||
107 | |||
108 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) | ||
109 | return -EINVAL; | ||
110 | |||
111 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); | ||
112 | if (!inode) | ||
113 | return -ENOMEM; | ||
114 | |||
115 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | ||
116 | if (!var) { | ||
117 | err = -ENOMEM; | ||
118 | goto out; | ||
119 | } | ||
120 | |||
121 | /* length of the variable name itself: remove GUID and separator */ | ||
122 | namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1; | ||
123 | |||
124 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | ||
125 | &var->var.VendorGuid); | ||
126 | |||
127 | for (i = 0; i < namelen; i++) | ||
128 | var->var.VariableName[i] = dentry->d_name.name[i]; | ||
129 | |||
130 | var->var.VariableName[i] = '\0'; | ||
131 | |||
132 | inode->i_private = var; | ||
133 | |||
134 | efivar_entry_add(var, &efivarfs_list); | ||
135 | d_instantiate(dentry, inode); | ||
136 | dget(dentry); | ||
137 | out: | ||
138 | if (err) { | ||
139 | kfree(var); | ||
140 | iput(inode); | ||
141 | } | ||
142 | return err; | ||
143 | } | ||
144 | |||
145 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | ||
146 | { | ||
147 | struct efivar_entry *var = dentry->d_inode->i_private; | ||
148 | |||
149 | if (efivar_entry_delete(var)) | ||
150 | return -EINVAL; | ||
151 | |||
152 | drop_nlink(dentry->d_inode); | ||
153 | dput(dentry); | ||
154 | return 0; | ||
155 | }; | ||
156 | |||
157 | /* | ||
158 | * Handle negative dentry. | ||
159 | */ | ||
160 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | ||
161 | unsigned int flags) | ||
162 | { | ||
163 | if (dentry->d_name.len > NAME_MAX) | ||
164 | return ERR_PTR(-ENAMETOOLONG); | ||
165 | d_add(dentry, NULL); | ||
166 | return NULL; | ||
167 | } | ||
168 | |||
169 | const struct inode_operations efivarfs_dir_inode_operations = { | ||
170 | .lookup = efivarfs_lookup, | ||
171 | .unlink = efivarfs_unlink, | ||
172 | .create = efivarfs_create, | ||
173 | }; | ||
diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h new file mode 100644 index 000000000000..b5ff16addb7c --- /dev/null +++ b/fs/efivarfs/internal.h | |||
@@ -0,0 +1,22 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 Red Hat, Inc. | ||
3 | * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License version 2 as | ||
7 | * published by the Free Software Foundation. | ||
8 | */ | ||
9 | #ifndef EFIVAR_FS_INTERNAL_H | ||
10 | #define EFIVAR_FS_INTERNAL_H | ||
11 | |||
12 | #include <linux/list.h> | ||
13 | |||
14 | extern const struct file_operations efivarfs_file_operations; | ||
15 | extern const struct inode_operations efivarfs_dir_inode_operations; | ||
16 | extern bool efivarfs_valid_name(const char *str, int len); | ||
17 | extern struct inode *efivarfs_get_inode(struct super_block *sb, | ||
18 | const struct inode *dir, int mode, dev_t dev); | ||
19 | |||
20 | extern struct list_head efivarfs_list; | ||
21 | |||
22 | #endif /* EFIVAR_FS_INTERNAL_H */ | ||
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c new file mode 100644 index 000000000000..34c48f1fcdbc --- /dev/null +++ b/fs/efivarfs/super.c | |||
@@ -0,0 +1,267 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 Red Hat, Inc. | ||
3 | * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License version 2 as | ||
7 | * published by the Free Software Foundation. | ||
8 | */ | ||
9 | |||
10 | #include <linux/ctype.h> | ||
11 | #include <linux/efi.h> | ||
12 | #include <linux/fs.h> | ||
13 | #include <linux/module.h> | ||
14 | #include <linux/pagemap.h> | ||
15 | |||
16 | #include "internal.h" | ||
17 | |||
18 | LIST_HEAD(efivarfs_list); | ||
19 | |||
20 | static void efivarfs_evict_inode(struct inode *inode) | ||
21 | { | ||
22 | clear_inode(inode); | ||
23 | } | ||
24 | |||
25 | static const struct super_operations efivarfs_ops = { | ||
26 | .statfs = simple_statfs, | ||
27 | .drop_inode = generic_delete_inode, | ||
28 | .evict_inode = efivarfs_evict_inode, | ||
29 | .show_options = generic_show_options, | ||
30 | }; | ||
31 | |||
32 | static struct super_block *efivarfs_sb; | ||
33 | |||
34 | /* | ||
35 | * Compare two efivarfs file names. | ||
36 | * | ||
37 | * An efivarfs filename is composed of two parts, | ||
38 | * | ||
39 | * 1. A case-sensitive variable name | ||
40 | * 2. A case-insensitive GUID | ||
41 | * | ||
42 | * So we need to perform a case-sensitive match on part 1 and a | ||
43 | * case-insensitive match on part 2. | ||
44 | */ | ||
45 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | ||
46 | const struct dentry *dentry, const struct inode *inode, | ||
47 | unsigned int len, const char *str, | ||
48 | const struct qstr *name) | ||
49 | { | ||
50 | int guid = len - EFI_VARIABLE_GUID_LEN; | ||
51 | |||
52 | if (name->len != len) | ||
53 | return 1; | ||
54 | |||
55 | /* Case-sensitive compare for the variable name */ | ||
56 | if (memcmp(str, name->name, guid)) | ||
57 | return 1; | ||
58 | |||
59 | /* Case-insensitive compare for the GUID */ | ||
60 | return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN); | ||
61 | } | ||
62 | |||
63 | static int efivarfs_d_hash(const struct dentry *dentry, | ||
64 | const struct inode *inode, struct qstr *qstr) | ||
65 | { | ||
66 | unsigned long hash = init_name_hash(); | ||
67 | const unsigned char *s = qstr->name; | ||
68 | unsigned int len = qstr->len; | ||
69 | |||
70 | if (!efivarfs_valid_name(s, len)) | ||
71 | return -EINVAL; | ||
72 | |||
73 | while (len-- > EFI_VARIABLE_GUID_LEN) | ||
74 | hash = partial_name_hash(*s++, hash); | ||
75 | |||
76 | /* GUID is case-insensitive. */ | ||
77 | while (len--) | ||
78 | hash = partial_name_hash(tolower(*s++), hash); | ||
79 | |||
80 | qstr->hash = end_name_hash(hash); | ||
81 | return 0; | ||
82 | } | ||
83 | |||
84 | /* | ||
85 | * Retaining negative dentries for an in-memory filesystem just wastes | ||
86 | * memory and lookup time: arrange for them to be deleted immediately. | ||
87 | */ | ||
88 | static int efivarfs_delete_dentry(const struct dentry *dentry) | ||
89 | { | ||
90 | return 1; | ||
91 | } | ||
92 | |||
93 | static struct dentry_operations efivarfs_d_ops = { | ||
94 | .d_compare = efivarfs_d_compare, | ||
95 | .d_hash = efivarfs_d_hash, | ||
96 | .d_delete = efivarfs_delete_dentry, | ||
97 | }; | ||
98 | |||
99 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | ||
100 | { | ||
101 | struct dentry *d; | ||
102 | struct qstr q; | ||
103 | int err; | ||
104 | |||
105 | q.name = name; | ||
106 | q.len = strlen(name); | ||
107 | |||
108 | err = efivarfs_d_hash(NULL, NULL, &q); | ||
109 | if (err) | ||
110 | return ERR_PTR(err); | ||
111 | |||
112 | d = d_alloc(parent, &q); | ||
113 | if (d) | ||
114 | return d; | ||
115 | |||
116 | return ERR_PTR(-ENOMEM); | ||
117 | } | ||
118 | |||
119 | static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, | ||
120 | unsigned long name_size, void *data) | ||
121 | { | ||
122 | struct super_block *sb = (struct super_block *)data; | ||
123 | struct efivar_entry *entry; | ||
124 | struct inode *inode = NULL; | ||
125 | struct dentry *dentry, *root = sb->s_root; | ||
126 | unsigned long size = 0; | ||
127 | char *name; | ||
128 | int len, i; | ||
129 | int err = -ENOMEM; | ||
130 | |||
131 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | ||
132 | if (!entry) | ||
133 | return err; | ||
134 | |||
135 | memcpy(entry->var.VariableName, name16, name_size); | ||
136 | memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); | ||
137 | |||
138 | len = utf16_strlen(entry->var.VariableName); | ||
139 | |||
140 | /* name, plus '-', plus GUID, plus NUL*/ | ||
141 | name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL); | ||
142 | if (!name) | ||
143 | goto fail; | ||
144 | |||
145 | for (i = 0; i < len; i++) | ||
146 | name[i] = entry->var.VariableName[i] & 0xFF; | ||
147 | |||
148 | name[len] = '-'; | ||
149 | |||
150 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | ||
151 | |||
152 | name[len + EFI_VARIABLE_GUID_LEN+1] = '\0'; | ||
153 | |||
154 | inode = efivarfs_get_inode(sb, root->d_inode, S_IFREG | 0644, 0); | ||
155 | if (!inode) | ||
156 | goto fail_name; | ||
157 | |||
158 | dentry = efivarfs_alloc_dentry(root, name); | ||
159 | if (IS_ERR(dentry)) { | ||
160 | err = PTR_ERR(dentry); | ||
161 | goto fail_inode; | ||
162 | } | ||
163 | |||
164 | /* copied by the above to local storage in the dentry. */ | ||
165 | kfree(name); | ||
166 | |||
167 | efivar_entry_size(entry, &size); | ||
168 | efivar_entry_add(entry, &efivarfs_list); | ||
169 | |||
170 | mutex_lock(&inode->i_mutex); | ||
171 | inode->i_private = entry; | ||
172 | i_size_write(inode, size + sizeof(entry->var.Attributes)); | ||
173 | mutex_unlock(&inode->i_mutex); | ||
174 | d_add(dentry, inode); | ||
175 | |||
176 | return 0; | ||
177 | |||
178 | fail_inode: | ||
179 | iput(inode); | ||
180 | fail_name: | ||
181 | kfree(name); | ||
182 | fail: | ||
183 | kfree(entry); | ||
184 | return err; | ||
185 | } | ||
186 | |||
187 | static int efivarfs_destroy(struct efivar_entry *entry, void *data) | ||
188 | { | ||
189 | efivar_entry_remove(entry); | ||
190 | kfree(entry); | ||
191 | return 0; | ||
192 | } | ||
193 | |||
194 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) | ||
195 | { | ||
196 | struct inode *inode = NULL; | ||
197 | struct dentry *root; | ||
198 | int err; | ||
199 | |||
200 | efivarfs_sb = sb; | ||
201 | |||
202 | sb->s_maxbytes = MAX_LFS_FILESIZE; | ||
203 | sb->s_blocksize = PAGE_CACHE_SIZE; | ||
204 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | ||
205 | sb->s_magic = EFIVARFS_MAGIC; | ||
206 | sb->s_op = &efivarfs_ops; | ||
207 | sb->s_d_op = &efivarfs_d_ops; | ||
208 | sb->s_time_gran = 1; | ||
209 | |||
210 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | ||
211 | if (!inode) | ||
212 | return -ENOMEM; | ||
213 | inode->i_op = &efivarfs_dir_inode_operations; | ||
214 | |||
215 | root = d_make_root(inode); | ||
216 | sb->s_root = root; | ||
217 | if (!root) | ||
218 | return -ENOMEM; | ||
219 | |||
220 | INIT_LIST_HEAD(&efivarfs_list); | ||
221 | |||
222 | err = efivar_init(efivarfs_callback, (void *)sb, false, | ||
223 | true, &efivarfs_list); | ||
224 | if (err) | ||
225 | __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL); | ||
226 | |||
227 | return err; | ||
228 | } | ||
229 | |||
230 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | ||
231 | int flags, const char *dev_name, void *data) | ||
232 | { | ||
233 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | ||
234 | } | ||
235 | |||
236 | static void efivarfs_kill_sb(struct super_block *sb) | ||
237 | { | ||
238 | kill_litter_super(sb); | ||
239 | efivarfs_sb = NULL; | ||
240 | |||
241 | /* Remove all entries and destroy */ | ||
242 | __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL); | ||
243 | } | ||
244 | |||
245 | static struct file_system_type efivarfs_type = { | ||
246 | .name = "efivarfs", | ||
247 | .mount = efivarfs_mount, | ||
248 | .kill_sb = efivarfs_kill_sb, | ||
249 | }; | ||
250 | |||
251 | static __init int efivarfs_init(void) | ||
252 | { | ||
253 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) | ||
254 | return 0; | ||
255 | |||
256 | if (!efivars_kobject()) | ||
257 | return 0; | ||
258 | |||
259 | return register_filesystem(&efivarfs_type); | ||
260 | } | ||
261 | |||
262 | MODULE_AUTHOR("Matthew Garrett, Jeremy Kerr"); | ||
263 | MODULE_DESCRIPTION("EFI Variable Filesystem"); | ||
264 | MODULE_LICENSE("GPL"); | ||
265 | MODULE_ALIAS_FS("efivarfs"); | ||
266 | |||
267 | module_init(efivarfs_init); | ||