1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #include <linux/fs.h>
3 #include <linux/qnx4_fs.h>
4
5 #define QNX4_DEBUG 0
6
7 #if QNX4_DEBUG
8 #define QNX4DEBUG(X) printk X
9 #else
10 #define QNX4DEBUG(X) (void) 0
11 #endif
12
13 struct qnx4_sb_info {
14 unsigned int Version;
15 struct qnx4_inode_entry *BitMap;
16 };
17
18 struct qnx4_inode_info {
19 struct qnx4_inode_entry raw;
20 loff_t mmu_private;
21 struct inode vfs_inode;
22 };
23
24 extern struct inode *qnx4_iget(struct super_bl
25 extern struct dentry *qnx4_lookup(struct inode
26 extern unsigned long qnx4_count_free_blocks(st
27 extern unsigned long qnx4_block_map(struct ino
28
29 extern const struct inode_operations qnx4_dir_
30 extern const struct file_operations qnx4_dir_o
31 extern int qnx4_is_free(struct super_block *sb
32
33 static inline struct qnx4_sb_info *qnx4_sb(str
34 {
35 return sb->s_fs_info;
36 }
37
38 static inline struct qnx4_inode_info *qnx4_i(s
39 {
40 return container_of(inode, struct qnx4
41 }
42
43 static inline struct qnx4_inode_entry *qnx4_ra
44 {
45 return &qnx4_i(inode)->raw;
46 }
47
48 /*
49 * A qnx4 directory entry is an inode entry or
50 * depending on the status field in the last b
51 * first byte is where the name start either w
52 * zero means it's empty.
53 *
54 * Also, due to a bug in gcc, we don't want to
55 * real (differently sized) name arrays in the
56 * link entries, but always the 'de_name[]' on
57 * fake struct entry.
58 *
59 * See
60 *
61 * https://gcc.gnu.org/bugzilla/show_bug.cgi
62 *
63 * for details, but basically gcc will take th
64 * 'name' array from one of the used union ent
65 *
66 * This use of 'de_name[]' (48 bytes) avoids t
67 * warnings that would happen if gcc decides t
68 * (16 bytes) even when the pointer and size w
69 * 'link.dl_name' (48 bytes).
70 *
71 * In all cases the actual name pointer itself
72 * only the gcc internal 'what is the size of
73 * that can get confused.
74 */
75 union qnx4_directory_entry {
76 struct {
77 const char de_name[48];
78 u8 de_pad[15];
79 u8 de_status;
80 };
81 struct qnx4_inode_entry inode;
82 struct qnx4_link_info link;
83 };
84
85 static inline const char *get_entry_fname(unio
86 int
87 {
88 /* Make sure the status byte is in the
89 BUILD_BUG_ON(offsetof(struct qnx4_inod
90 offsetof(struct qnx4_l
91 BUILD_BUG_ON(offsetof(struct qnx4_inod
92 offsetof(union qnx4_di
93
94 if (!de->de_name[0])
95 return NULL;
96 if (!(de->de_status & (QNX4_FILE_USED|
97 return NULL;
98 if (!(de->de_status & QNX4_FILE_LINK))
99 *size = sizeof(de->inode.di_fn
100 else
101 *size = sizeof(de->link.dl_fna
102
103 *size = strnlen(de->de_name, *size);
104
105 return de->de_name;
106 }
107
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