URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [generic_acl.c] - Blame information for rev 62

Details | Compare with Previous | View Log


/*
 * fs/generic_acl.c
 *
 * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
 *
 * This file is released under the GPL.
 */
 
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/generic_acl.h>
 
/**
 * generic_acl_list  -  Generic xattr_handler->list() operation
 * @ops:        Filesystem specific getacl and setacl callbacks
 */
size_t
generic_acl_list(struct inode *inode, struct generic_acl_operations *ops,
                 int type, char *list, size_t list_size)
{
        struct posix_acl *acl;
        const char *name;
        size_t size;
 
        acl = ops->getacl(inode, type);
        if (!acl)
                return 0;
        posix_acl_release(acl);
 
        switch(type) {
                case ACL_TYPE_ACCESS:
                        name = POSIX_ACL_XATTR_ACCESS;
                        break;
 
                case ACL_TYPE_DEFAULT:
                        name = POSIX_ACL_XATTR_DEFAULT;
                        break;
 
                default:
                        return 0;
        }
        size = strlen(name) + 1;
        if (list && size <= list_size)
                memcpy(list, name, size);
        return size;
}
 
/**
 * generic_acl_get  -  Generic xattr_handler->get() operation
 * @ops:        Filesystem specific getacl and setacl callbacks
 */
int
generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
                int type, void *buffer, size_t size)
{
        struct posix_acl *acl;
        int error;
 
        acl = ops->getacl(inode, type);
        if (!acl)
                return -ENODATA;
        error = posix_acl_to_xattr(acl, buffer, size);
        posix_acl_release(acl);
 
        return error;
}
 
/**
 * generic_acl_set  -  Generic xattr_handler->set() operation
 * @ops:        Filesystem specific getacl and setacl callbacks
 */
int
generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
                int type, const void *value, size_t size)
{
        struct posix_acl *acl = NULL;
        int error;
 
        if (S_ISLNK(inode->i_mode))
                return -EOPNOTSUPP;
        if (!is_owner_or_cap(inode))
                return -EPERM;
        if (value) {
                acl = posix_acl_from_xattr(value, size);
                if (IS_ERR(acl))
                        return PTR_ERR(acl);
        }
        if (acl) {
                mode_t mode;
 
                error = posix_acl_valid(acl);
                if (error)
                        goto failed;
                switch(type) {
                        case ACL_TYPE_ACCESS:
                                mode = inode->i_mode;
                                error = posix_acl_equiv_mode(acl, &mode);
                                if (error < 0)
                                        goto failed;
                                inode->i_mode = mode;
                                if (error == 0) {
                                        posix_acl_release(acl);
                                        acl = NULL;
                                }
                                break;
 
                        case ACL_TYPE_DEFAULT:
                                if (!S_ISDIR(inode->i_mode)) {
                                        error = -EINVAL;
                                        goto failed;
                                }
                                break;
                }
        }
        ops->setacl(inode, type, acl);
        error = 0;
failed:
        posix_acl_release(acl);
        return error;
}
 
/**
 * generic_acl_init  -  Take care of acl inheritance at @inode create time
 * @ops:        Filesystem specific getacl and setacl callbacks
 *
 * Files created inside a directory with a default ACL inherit the
 * directory's default ACL.
 */
int
generic_acl_init(struct inode *inode, struct inode *dir,
                 struct generic_acl_operations *ops)
{
        struct posix_acl *acl = NULL;
        mode_t mode = inode->i_mode;
        int error;
 
        inode->i_mode = mode & ~current->fs->umask;
        if (!S_ISLNK(inode->i_mode))
                acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
        if (acl) {
                struct posix_acl *clone;
 
                if (S_ISDIR(inode->i_mode)) {
                        clone = posix_acl_clone(acl, GFP_KERNEL);
                        error = -ENOMEM;
                        if (!clone)
                                goto cleanup;
                        ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
                        posix_acl_release(clone);
                }
                clone = posix_acl_clone(acl, GFP_KERNEL);
                error = -ENOMEM;
                if (!clone)
                        goto cleanup;
                error = posix_acl_create_masq(clone, &mode);
                if (error >= 0) {
                        inode->i_mode = mode;
                        if (error > 0)
                                ops->setacl(inode, ACL_TYPE_ACCESS, clone);
                }
                posix_acl_release(clone);
        }
        error = 0;
 
cleanup:
        posix_acl_release(acl);
        return error;
}
 
/**
 * generic_acl_chmod  -  change the access acl of @inode upon chmod()
 * @ops:        FIlesystem specific getacl and setacl callbacks
 *
 * A chmod also changes the permissions of the owner, group/mask, and
 * other ACL entries.
 */
int
generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
{
        struct posix_acl *acl, *clone;
        int error = 0;
 
        if (S_ISLNK(inode->i_mode))
                return -EOPNOTSUPP;
        acl = ops->getacl(inode, ACL_TYPE_ACCESS);
        if (acl) {
                clone = posix_acl_clone(acl, GFP_KERNEL);
                posix_acl_release(acl);
                if (!clone)
                        return -ENOMEM;
                error = posix_acl_chmod_masq(clone, inode->i_mode);
                if (!error)
                        ops->setacl(inode, ACL_TYPE_ACCESS, clone);
                posix_acl_release(clone);
        }
        return error;
}

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* fs/generic_acl.c`
3			`*`
4			`* (C) 2005 Andreas Gruenbacher <agruen@suse.de>`
5			`*`
6			`* This file is released under the GPL.`
7			`*/`
8
9			`#include <linux/sched.h>`
10			`#include <linux/fs.h>`
11			`#include <linux/generic_acl.h>`
12
13			`/**`
14			`* generic_acl_list - Generic xattr_handler->list() operation`
15			`* @ops: Filesystem specific getacl and setacl callbacks`
16			`*/`
17			`size_t`
18			`generic_acl_list(struct inode inode, struct generic_acl_operations ops,`
19			`int type, char *list, size_t list_size)`
20			`{`
21			`struct posix_acl *acl;`
22			`const char *name;`
23			`size_t size;`
24
25			`acl = ops->getacl(inode, type);`
26			`if (!acl)`
27			`return 0;`
28			`posix_acl_release(acl);`
29
30			`switch(type) {`
31			`case ACL_TYPE_ACCESS:`
32			`name = POSIX_ACL_XATTR_ACCESS;`
33			`break;`
34
35			`case ACL_TYPE_DEFAULT:`
36			`name = POSIX_ACL_XATTR_DEFAULT;`
37			`break;`
38
39			`default:`
40			`return 0;`
41			`}`
42			`size = strlen(name) + 1;`
43			`if (list && size <= list_size)`
44			`memcpy(list, name, size);`
45			`return size;`
46			`}`
47
48			`/**`
49			`* generic_acl_get - Generic xattr_handler->get() operation`
50			`* @ops: Filesystem specific getacl and setacl callbacks`
51			`*/`
52			`int`
53			`generic_acl_get(struct inode inode, struct generic_acl_operations ops,`
54			`int type, void *buffer, size_t size)`
55			`{`
56			`struct posix_acl *acl;`
57			`int error;`
58
59			`acl = ops->getacl(inode, type);`
60			`if (!acl)`
61			`return -ENODATA;`
62			`error = posix_acl_to_xattr(acl, buffer, size);`
63			`posix_acl_release(acl);`
64
65			`return error;`
66			`}`
67
68			`/**`
69			`* generic_acl_set - Generic xattr_handler->set() operation`
70			`* @ops: Filesystem specific getacl and setacl callbacks`
71			`*/`
72			`int`
73			`generic_acl_set(struct inode inode, struct generic_acl_operations ops,`
74			`int type, const void *value, size_t size)`
75			`{`
76			`struct posix_acl *acl = NULL;`
77			`int error;`
78
79			`if (S_ISLNK(inode->i_mode))`
80			`return -EOPNOTSUPP;`
81			`if (!is_owner_or_cap(inode))`
82			`return -EPERM;`
83			`if (value) {`
84			`acl = posix_acl_from_xattr(value, size);`
85			`if (IS_ERR(acl))`
86			`return PTR_ERR(acl);`
87			`}`
88			`if (acl) {`
89			`mode_t mode;`
90
91			`error = posix_acl_valid(acl);`
92			`if (error)`
93			`goto failed;`
94			`switch(type) {`
95			`case ACL_TYPE_ACCESS:`
96			`mode = inode->i_mode;`
97			`error = posix_acl_equiv_mode(acl, &mode);`
98			`if (error < 0)`
99			`goto failed;`
100			`inode->i_mode = mode;`
101			`if (error == 0) {`
102			`posix_acl_release(acl);`
103			`acl = NULL;`
104			`}`
105			`break;`
106
107			`case ACL_TYPE_DEFAULT:`
108			`if (!S_ISDIR(inode->i_mode)) {`
109			`error = -EINVAL;`
110			`goto failed;`
111			`}`
112			`break;`
113			`}`
114			`}`
115			`ops->setacl(inode, type, acl);`
116			`error = 0;`
117			`failed:`
118			`posix_acl_release(acl);`
119			`return error;`
120			`}`
121
122			`/**`
123			`* generic_acl_init - Take care of acl inheritance at @inode create time`
124			`* @ops: Filesystem specific getacl and setacl callbacks`
125			`*`
126			`* Files created inside a directory with a default ACL inherit the`
127			`* directory's default ACL.`
128			`*/`
129			`int`
130			`generic_acl_init(struct inode inode, struct inode dir,`
131			`struct generic_acl_operations *ops)`
132			`{`
133			`struct posix_acl *acl = NULL;`
134			`mode_t mode = inode->i_mode;`
135			`int error;`
136
137			`inode->i_mode = mode & ~current->fs->umask;`
138			`if (!S_ISLNK(inode->i_mode))`
139			`acl = ops->getacl(dir, ACL_TYPE_DEFAULT);`
140			`if (acl) {`
141			`struct posix_acl *clone;`
142
143			`if (S_ISDIR(inode->i_mode)) {`
144			`clone = posix_acl_clone(acl, GFP_KERNEL);`
145			`error = -ENOMEM;`
146			`if (!clone)`
147			`goto cleanup;`
148			`ops->setacl(inode, ACL_TYPE_DEFAULT, clone);`
149			`posix_acl_release(clone);`
150			`}`
151			`clone = posix_acl_clone(acl, GFP_KERNEL);`
152			`error = -ENOMEM;`
153			`if (!clone)`
154			`goto cleanup;`
155			`error = posix_acl_create_masq(clone, &mode);`
156			`if (error >= 0) {`
157			`inode->i_mode = mode;`
158			`if (error > 0)`
159			`ops->setacl(inode, ACL_TYPE_ACCESS, clone);`
160			`}`
161			`posix_acl_release(clone);`
162			`}`
163			`error = 0;`
164
165			`cleanup:`
166			`posix_acl_release(acl);`
167			`return error;`
168			`}`
169
170			`/**`
171			`* generic_acl_chmod - change the access acl of @inode upon chmod()`
172			`* @ops: FIlesystem specific getacl and setacl callbacks`
173			`*`
174			`* A chmod also changes the permissions of the owner, group/mask, and`
175			`* other ACL entries.`
176			`*/`
177			`int`
178			`generic_acl_chmod(struct inode inode, struct generic_acl_operations ops)`
179			`{`
180			`struct posix_acl acl, clone;`
181			`int error = 0;`
182
183			`if (S_ISLNK(inode->i_mode))`
184			`return -EOPNOTSUPP;`
185			`acl = ops->getacl(inode, ACL_TYPE_ACCESS);`
186			`if (acl) {`
187			`clone = posix_acl_clone(acl, GFP_KERNEL);`
188			`posix_acl_release(acl);`
189			`if (!clone)`
190			`return -ENOMEM;`
191			`error = posix_acl_chmod_masq(clone, inode->i_mode);`
192			`if (!error)`
193			`ops->setacl(inode, ACL_TYPE_ACCESS, clone);`
194			`posix_acl_release(clone);`
195			`}`
196			`return error;`
197			`}`

Browse

Tools

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [generic_acl.c] - Blame information for rev 62