[PATCH] BLOCK: Move common FS-specific ioctls to linux/fs.h [try #6]
[linux-2.6.git] / fs / hfsplus / ioctl.c
1 /*
2  *  linux/fs/hfsplus/ioctl.c
3  *
4  * Copyright (C) 2003
5  * Ethan Benson <erbenson@alaska.net>
6  * partially derived from linux/fs/ext2/ioctl.c
7  * Copyright (C) 1993, 1994, 1995
8  * Remy Card (card@masi.ibp.fr)
9  * Laboratoire MASI - Institut Blaise Pascal
10  * Universite Pierre et Marie Curie (Paris VI)
11  *
12  * hfsplus ioctls
13  */
14
15 #include <linux/capability.h>
16 #include <linux/fs.h>
17 #include <linux/sched.h>
18 #include <linux/xattr.h>
19 #include <asm/uaccess.h>
20 #include "hfsplus_fs.h"
21
22 int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
23                   unsigned long arg)
24 {
25         unsigned int flags;
26
27         switch (cmd) {
28         case HFSPLUS_IOC_EXT2_GETFLAGS:
29                 flags = 0;
30                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
31                         flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
32                 if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
33                         flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
34                 if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
35                         flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
36                 return put_user(flags, (int __user *)arg);
37         case HFSPLUS_IOC_EXT2_SETFLAGS: {
38                 if (IS_RDONLY(inode))
39                         return -EROFS;
40
41                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
42                         return -EACCES;
43
44                 if (get_user(flags, (int __user *)arg))
45                         return -EFAULT;
46
47                 if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
48                     HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
49                         if (!capable(CAP_LINUX_IMMUTABLE))
50                                 return -EPERM;
51                 }
52
53                 /* don't silently ignore unsupported ext2 flags */
54                 if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
55                         return -EOPNOTSUPP;
56
57                 if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
58                         inode->i_flags |= S_IMMUTABLE;
59                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
60                 } else {
61                         inode->i_flags &= ~S_IMMUTABLE;
62                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
63                 }
64                 if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
65                         inode->i_flags |= S_APPEND;
66                         HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
67                 } else {
68                         inode->i_flags &= ~S_APPEND;
69                         HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
70                 }
71                 if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
72                         HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
73                 else
74                         HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
75
76                 inode->i_ctime = CURRENT_TIME_SEC;
77                 mark_inode_dirty(inode);
78                 return 0;
79         }
80         default:
81                 return -ENOTTY;
82         }
83 }
84
85 int hfsplus_setxattr(struct dentry *dentry, const char *name,
86                      const void *value, size_t size, int flags)
87 {
88         struct inode *inode = dentry->d_inode;
89         struct hfs_find_data fd;
90         hfsplus_cat_entry entry;
91         struct hfsplus_cat_file *file;
92         int res;
93
94         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
95                 return -EOPNOTSUPP;
96
97         res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
98         if (res)
99                 return res;
100         res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
101         if (res)
102                 goto out;
103         hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
104                         sizeof(struct hfsplus_cat_file));
105         file = &entry.file;
106
107         if (!strcmp(name, "hfs.type")) {
108                 if (size == 4)
109                         memcpy(&file->user_info.fdType, value, 4);
110                 else
111                         res = -ERANGE;
112         } else if (!strcmp(name, "hfs.creator")) {
113                 if (size == 4)
114                         memcpy(&file->user_info.fdCreator, value, 4);
115                 else
116                         res = -ERANGE;
117         } else
118                 res = -EOPNOTSUPP;
119         if (!res)
120                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
121                                 sizeof(struct hfsplus_cat_file));
122 out:
123         hfs_find_exit(&fd);
124         return res;
125 }
126
127 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
128                          void *value, size_t size)
129 {
130         struct inode *inode = dentry->d_inode;
131         struct hfs_find_data fd;
132         hfsplus_cat_entry entry;
133         struct hfsplus_cat_file *file;
134         ssize_t res = 0;
135
136         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
137                 return -EOPNOTSUPP;
138
139         if (size) {
140                 res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
141                 if (res)
142                         return res;
143                 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
144                 if (res)
145                         goto out;
146                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
147                                 sizeof(struct hfsplus_cat_file));
148         }
149         file = &entry.file;
150
151         if (!strcmp(name, "hfs.type")) {
152                 if (size >= 4) {
153                         memcpy(value, &file->user_info.fdType, 4);
154                         res = 4;
155                 } else
156                         res = size ? -ERANGE : 4;
157         } else if (!strcmp(name, "hfs.creator")) {
158                 if (size >= 4) {
159                         memcpy(value, &file->user_info.fdCreator, 4);
160                         res = 4;
161                 } else
162                         res = size ? -ERANGE : 4;
163         } else
164                 res = -ENODATA;
165 out:
166         if (size)
167                 hfs_find_exit(&fd);
168         return res;
169 }
170
171 #define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
172
173 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
174 {
175         struct inode *inode = dentry->d_inode;
176
177         if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
178                 return -EOPNOTSUPP;
179
180         if (!buffer || !size)
181                 return HFSPLUS_ATTRLIST_SIZE;
182         if (size < HFSPLUS_ATTRLIST_SIZE)
183                 return -ERANGE;
184         strcpy(buffer, "hfs.type");
185         strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
186
187         return HFSPLUS_ATTRLIST_SIZE;
188 }