1 |
1275 |
phoenix |
/*
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2 |
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* linux/fs/umsdos/namei.c
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3 |
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*
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4 |
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* Written 1993 by Jacques Gelinas
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5 |
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* Inspired from linux/fs/msdos/... by Werner Almesberger
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6 |
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*
|
7 |
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* Maintain and access the --linux alternate directory file.
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8 |
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*/
|
9 |
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/*
|
10 |
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* You are in the maze of twisted functions - half of them shouldn't
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11 |
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* be here...
|
12 |
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*/
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13 |
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14 |
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#include <linux/errno.h>
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15 |
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#include <linux/kernel.h>
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16 |
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#include <linux/sched.h>
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17 |
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#include <linux/types.h>
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18 |
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#include <linux/fcntl.h>
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19 |
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#include <linux/stat.h>
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20 |
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#include <linux/string.h>
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21 |
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#include <linux/msdos_fs.h>
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22 |
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#include <linux/umsdos_fs.h>
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23 |
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#include <linux/slab.h>
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24 |
|
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25 |
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#define UMSDOS_DIR_LOCK
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26 |
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|
27 |
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#ifdef UMSDOS_DIR_LOCK
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28 |
|
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|
29 |
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static inline void u_sleep_on (struct inode *dir)
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30 |
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{
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31 |
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sleep_on (&dir->u.umsdos_i.dir_info.p);
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32 |
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}
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33 |
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|
34 |
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static inline void u_wake_up (struct inode *dir)
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35 |
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{
|
36 |
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wake_up (&dir->u.umsdos_i.dir_info.p);
|
37 |
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|
}
|
38 |
|
|
|
39 |
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/*
|
40 |
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* Wait for creation exclusivity.
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41 |
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* Return 0 if the dir was already available.
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42 |
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* Return 1 if a wait was necessary.
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43 |
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* When 1 is return, it means a wait was done. It does not
|
44 |
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* mean the directory is available.
|
45 |
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*/
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46 |
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static int umsdos_waitcreate (struct inode *dir)
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47 |
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|
{
|
48 |
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int ret = 0;
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49 |
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|
50 |
|
|
if (dir->u.umsdos_i.dir_info.creating
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51 |
|
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&& dir->u.umsdos_i.dir_info.pid != current->pid) {
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52 |
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PRINTK (("creating && dir_info.pid=%lu, current->pid=%u\n", dir->u.umsdos_i.dir_info.pid, current->pid));
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53 |
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u_sleep_on (dir);
|
54 |
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ret = 1;
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55 |
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}
|
56 |
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return ret;
|
57 |
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}
|
58 |
|
|
|
59 |
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|
/*
|
60 |
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* Wait for any lookup process to finish
|
61 |
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*/
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62 |
|
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static void umsdos_waitlookup (struct inode *dir)
|
63 |
|
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{
|
64 |
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while (dir->u.umsdos_i.dir_info.looking) {
|
65 |
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u_sleep_on (dir);
|
66 |
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}
|
67 |
|
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}
|
68 |
|
|
|
69 |
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/*
|
70 |
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* Lock all other process out of this directory.
|
71 |
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*/
|
72 |
|
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/* #Specification: file creation / not atomic
|
73 |
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* File creation is a two step process. First we create (allocate)
|
74 |
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* an entry in the EMD file and then (using the entry offset) we
|
75 |
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* build a unique name for MSDOS. We create this name in the msdos
|
76 |
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* space.
|
77 |
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*
|
78 |
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* We have to use semaphore (sleep_on/wake_up) to prevent lookup
|
79 |
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* into a directory when we create a file or directory and to
|
80 |
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* prevent creation while a lookup is going on. Since many lookup
|
81 |
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* may happen at the same time, the semaphore is a counter.
|
82 |
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*
|
83 |
|
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* Only one creation is allowed at the same time. This protection
|
84 |
|
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* may not be necessary. The problem arise mainly when a lookup
|
85 |
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* or a readdir is done while a file is partially created. The
|
86 |
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* lookup process see that as a "normal" problem and silently
|
87 |
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* erase the file from the EMD file. Normal because a file
|
88 |
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* may be erased during a MSDOS session, but not removed from
|
89 |
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* the EMD file.
|
90 |
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*
|
91 |
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* The locking is done on a directory per directory basis. Each
|
92 |
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* directory inode has its wait_queue.
|
93 |
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*
|
94 |
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* For some operation like hard link, things even get worse. Many
|
95 |
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* creation must occur at once (atomic). To simplify the design
|
96 |
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* a process is allowed to recursively lock the directory for
|
97 |
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* creation. The pid of the locking process is kept along with
|
98 |
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* a counter so a second level of locking is granted or not.
|
99 |
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*/
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100 |
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void umsdos_lockcreate (struct inode *dir)
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101 |
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{
|
102 |
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/*
|
103 |
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* Wait for any creation process to finish except
|
104 |
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* if we (the process) own the lock
|
105 |
|
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*/
|
106 |
|
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while (umsdos_waitcreate (dir) != 0);
|
107 |
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dir->u.umsdos_i.dir_info.creating++;
|
108 |
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dir->u.umsdos_i.dir_info.pid = current->pid;
|
109 |
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umsdos_waitlookup (dir);
|
110 |
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}
|
111 |
|
|
|
112 |
|
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/*
|
113 |
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* Lock all other process out of those two directories.
|
114 |
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*/
|
115 |
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static void umsdos_lockcreate2 (struct inode *dir1, struct inode *dir2)
|
116 |
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{
|
117 |
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/*
|
118 |
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* We must check that both directory are available before
|
119 |
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* locking anyone of them. This is to avoid some deadlock.
|
120 |
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* Thanks to dglaude@is1.vub.ac.be (GLAUDE DAVID) for pointing
|
121 |
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* this to me.
|
122 |
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*/
|
123 |
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while (1) {
|
124 |
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if (umsdos_waitcreate (dir1) == 0
|
125 |
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&& umsdos_waitcreate (dir2) == 0) {
|
126 |
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/* We own both now */
|
127 |
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dir1->u.umsdos_i.dir_info.creating++;
|
128 |
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dir1->u.umsdos_i.dir_info.pid = current->pid;
|
129 |
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dir2->u.umsdos_i.dir_info.creating++;
|
130 |
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dir2->u.umsdos_i.dir_info.pid = current->pid;
|
131 |
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break;
|
132 |
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|
}
|
133 |
|
|
}
|
134 |
|
|
umsdos_waitlookup (dir1);
|
135 |
|
|
umsdos_waitlookup (dir2);
|
136 |
|
|
}
|
137 |
|
|
|
138 |
|
|
/*
|
139 |
|
|
* Wait until creation is finish in this directory.
|
140 |
|
|
*/
|
141 |
|
|
void umsdos_startlookup (struct inode *dir)
|
142 |
|
|
{
|
143 |
|
|
while (umsdos_waitcreate (dir) != 0);
|
144 |
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|
dir->u.umsdos_i.dir_info.looking++;
|
145 |
|
|
}
|
146 |
|
|
|
147 |
|
|
/*
|
148 |
|
|
* Unlock the directory.
|
149 |
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|
*/
|
150 |
|
|
void umsdos_unlockcreate (struct inode *dir)
|
151 |
|
|
{
|
152 |
|
|
dir->u.umsdos_i.dir_info.creating--;
|
153 |
|
|
if (dir->u.umsdos_i.dir_info.creating < 0) {
|
154 |
|
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printk ("UMSDOS: dir->u.umsdos_i.dir_info.creating < 0: %d"
|
155 |
|
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,dir->u.umsdos_i.dir_info.creating);
|
156 |
|
|
}
|
157 |
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u_wake_up (dir);
|
158 |
|
|
}
|
159 |
|
|
|
160 |
|
|
/*
|
161 |
|
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* Tell directory lookup is over.
|
162 |
|
|
*/
|
163 |
|
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void umsdos_endlookup (struct inode *dir)
|
164 |
|
|
{
|
165 |
|
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dir->u.umsdos_i.dir_info.looking--;
|
166 |
|
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if (dir->u.umsdos_i.dir_info.looking < 0) {
|
167 |
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printk ("UMSDOS: dir->u.umsdos_i.dir_info.looking < 0: %d"
|
168 |
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,dir->u.umsdos_i.dir_info.looking);
|
169 |
|
|
}
|
170 |
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u_wake_up (dir);
|
171 |
|
|
}
|
172 |
|
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|
173 |
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#else
|
174 |
|
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static void umsdos_lockcreate (struct inode *dir)
|
175 |
|
|
{
|
176 |
|
|
}
|
177 |
|
|
static void umsdos_lockcreate2 (struct inode *dir1, struct inode *dir2)
|
178 |
|
|
{
|
179 |
|
|
}
|
180 |
|
|
void umsdos_startlookup (struct inode *dir)
|
181 |
|
|
{
|
182 |
|
|
}
|
183 |
|
|
static void umsdos_unlockcreate (struct inode *dir)
|
184 |
|
|
{
|
185 |
|
|
}
|
186 |
|
|
void umsdos_endlookup (struct inode *dir)
|
187 |
|
|
{
|
188 |
|
|
}
|
189 |
|
|
|
190 |
|
|
#endif
|
191 |
|
|
|
192 |
|
|
static int umsdos_nevercreat (struct inode *dir, struct dentry *dentry,
|
193 |
|
|
int errcod)
|
194 |
|
|
{
|
195 |
|
|
int ret = 0;
|
196 |
|
|
|
197 |
|
|
if (umsdos_is_pseudodos (dir, dentry)) {
|
198 |
|
|
/* #Specification: pseudo root / any file creation /DOS
|
199 |
|
|
* The pseudo sub-directory /DOS can't be created!
|
200 |
|
|
* EEXIST is returned.
|
201 |
|
|
*
|
202 |
|
|
* The pseudo sub-directory /DOS can't be removed!
|
203 |
|
|
* EPERM is returned.
|
204 |
|
|
*/
|
205 |
|
|
ret = errcod;
|
206 |
|
|
}
|
207 |
|
|
return ret;
|
208 |
|
|
}
|
209 |
|
|
|
210 |
|
|
/*
|
211 |
|
|
* Add a new file (ordinary or special) into the alternate directory.
|
212 |
|
|
* The file is added to the real MSDOS directory. If successful, it
|
213 |
|
|
* is then added to the EMD file.
|
214 |
|
|
*
|
215 |
|
|
* Return the status of the operation. 0 mean success.
|
216 |
|
|
*
|
217 |
|
|
* #Specification: create / file exists in DOS
|
218 |
|
|
* Here is a situation: we are trying to create a file with
|
219 |
|
|
* UMSDOS. The file is unknown to UMSDOS but already
|
220 |
|
|
* exists in the DOS directory.
|
221 |
|
|
*
|
222 |
|
|
* Here is what we are NOT doing:
|
223 |
|
|
*
|
224 |
|
|
* We could silently assume that everything is fine
|
225 |
|
|
* and allows the creation to succeed.
|
226 |
|
|
*
|
227 |
|
|
* It is possible not all files in the partition
|
228 |
|
|
* are meant to be visible from linux. By trying to create
|
229 |
|
|
* those file in some directory, one user may get access
|
230 |
|
|
* to those file without proper permissions. Looks like
|
231 |
|
|
* a security hole to me. Off course sharing a file system
|
232 |
|
|
* with DOS is some kind of security hole :-)
|
233 |
|
|
*
|
234 |
|
|
* So ?
|
235 |
|
|
*
|
236 |
|
|
* We return EEXIST in this case.
|
237 |
|
|
* The same is true for directory creation.
|
238 |
|
|
*/
|
239 |
|
|
static int umsdos_create_any (struct inode *dir, struct dentry *dentry,
|
240 |
|
|
int mode, int rdev, char flags)
|
241 |
|
|
{
|
242 |
|
|
struct dentry *fake;
|
243 |
|
|
struct inode *inode;
|
244 |
|
|
int ret;
|
245 |
|
|
struct umsdos_info info;
|
246 |
|
|
|
247 |
|
|
ret = umsdos_nevercreat (dir, dentry, -EEXIST);
|
248 |
|
|
if (ret)
|
249 |
|
|
goto out;
|
250 |
|
|
|
251 |
|
|
ret = umsdos_parse (dentry->d_name.name, dentry->d_name.len, &info);
|
252 |
|
|
if (ret)
|
253 |
|
|
goto out;
|
254 |
|
|
|
255 |
|
|
info.entry.mode = mode;
|
256 |
|
|
info.entry.rdev = rdev;
|
257 |
|
|
info.entry.flags = flags;
|
258 |
|
|
info.entry.uid = current->fsuid;
|
259 |
|
|
info.entry.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
260 |
|
|
info.entry.ctime = info.entry.atime = info.entry.mtime = CURRENT_TIME;
|
261 |
|
|
info.entry.nlink = 1;
|
262 |
|
|
ret = umsdos_newentry (dentry->d_parent, &info);
|
263 |
|
|
if (ret)
|
264 |
|
|
goto out;
|
265 |
|
|
|
266 |
|
|
/* do a real lookup to get the short name dentry */
|
267 |
|
|
fake = umsdos_covered(dentry->d_parent, info.fake.fname, info.fake.len);
|
268 |
|
|
ret = PTR_ERR(fake);
|
269 |
|
|
if (IS_ERR(fake))
|
270 |
|
|
goto out_remove;
|
271 |
|
|
|
272 |
|
|
/* should not exist yet ... */
|
273 |
|
|
ret = -EEXIST;
|
274 |
|
|
if (fake->d_inode)
|
275 |
|
|
goto out_remove_dput;
|
276 |
|
|
|
277 |
|
|
ret = msdos_create (dir, fake, S_IFREG | 0777);
|
278 |
|
|
if (ret)
|
279 |
|
|
goto out_remove_dput;
|
280 |
|
|
|
281 |
|
|
inode = fake->d_inode;
|
282 |
|
|
atomic_inc(&inode->i_count);
|
283 |
|
|
d_instantiate (dentry, inode);
|
284 |
|
|
dput(fake);
|
285 |
|
|
if (atomic_read(&inode->i_count) > 1) {
|
286 |
|
|
printk(KERN_WARNING
|
287 |
|
|
"umsdos_create_any: %s/%s, ino=%ld, icount=%d??\n",
|
288 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
289 |
|
|
inode->i_ino, atomic_read(&inode->i_count));
|
290 |
|
|
}
|
291 |
|
|
umsdos_lookup_patch_new(dentry, &info);
|
292 |
|
|
|
293 |
|
|
out:
|
294 |
|
|
return ret;
|
295 |
|
|
|
296 |
|
|
/* Creation failed ... remove the EMD entry */
|
297 |
|
|
out_remove_dput:
|
298 |
|
|
dput(fake);
|
299 |
|
|
out_remove:
|
300 |
|
|
if (ret == -EEXIST)
|
301 |
|
|
printk(KERN_WARNING "UMSDOS: out of sync, deleting %s/%s\n",
|
302 |
|
|
dentry->d_parent->d_name.name, info.fake.fname);
|
303 |
|
|
umsdos_delentry (dentry->d_parent, &info, S_ISDIR (info.entry.mode));
|
304 |
|
|
goto out;
|
305 |
|
|
}
|
306 |
|
|
|
307 |
|
|
/*
|
308 |
|
|
* Add a new file into the alternate directory.
|
309 |
|
|
* The file is added to the real MSDOS directory. If successful, it
|
310 |
|
|
* is then added to the EMD file.
|
311 |
|
|
*
|
312 |
|
|
* Return the status of the operation. 0 mean success.
|
313 |
|
|
*/
|
314 |
|
|
int UMSDOS_create (struct inode *dir, struct dentry *dentry, int mode)
|
315 |
|
|
{
|
316 |
|
|
return umsdos_create_any (dir, dentry, mode, 0, 0);
|
317 |
|
|
}
|
318 |
|
|
|
319 |
|
|
|
320 |
|
|
/*
|
321 |
|
|
* Initialise the new_entry from the old for a rename operation.
|
322 |
|
|
* (Only useful for umsdos_rename_f() below).
|
323 |
|
|
*/
|
324 |
|
|
static void umsdos_ren_init (struct umsdos_info *new_info,
|
325 |
|
|
struct umsdos_info *old_info)
|
326 |
|
|
{
|
327 |
|
|
new_info->entry.mode = old_info->entry.mode;
|
328 |
|
|
new_info->entry.rdev = old_info->entry.rdev;
|
329 |
|
|
new_info->entry.uid = old_info->entry.uid;
|
330 |
|
|
new_info->entry.gid = old_info->entry.gid;
|
331 |
|
|
new_info->entry.ctime = old_info->entry.ctime;
|
332 |
|
|
new_info->entry.atime = old_info->entry.atime;
|
333 |
|
|
new_info->entry.mtime = old_info->entry.mtime;
|
334 |
|
|
new_info->entry.flags = old_info->entry.flags;
|
335 |
|
|
new_info->entry.nlink = old_info->entry.nlink;
|
336 |
|
|
}
|
337 |
|
|
|
338 |
|
|
/*
|
339 |
|
|
* Rename a file (move) in the file system.
|
340 |
|
|
*/
|
341 |
|
|
|
342 |
|
|
static int umsdos_rename_f (struct inode *old_dir, struct dentry *old_dentry,
|
343 |
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
344 |
|
|
int flags)
|
345 |
|
|
{
|
346 |
|
|
struct inode *old_inode = old_dentry->d_inode;
|
347 |
|
|
struct dentry *old, *new, *old_emd;
|
348 |
|
|
int err, ret;
|
349 |
|
|
struct umsdos_info old_info;
|
350 |
|
|
struct umsdos_info new_info;
|
351 |
|
|
|
352 |
|
|
ret = -EPERM;
|
353 |
|
|
err = umsdos_parse (old_dentry->d_name.name,
|
354 |
|
|
old_dentry->d_name.len, &old_info);
|
355 |
|
|
if (err)
|
356 |
|
|
goto out;
|
357 |
|
|
err = umsdos_parse (new_dentry->d_name.name,
|
358 |
|
|
new_dentry->d_name.len, &new_info);
|
359 |
|
|
if (err)
|
360 |
|
|
goto out;
|
361 |
|
|
|
362 |
|
|
/* Get the EMD dentry for the old parent */
|
363 |
|
|
old_emd = umsdos_get_emd_dentry(old_dentry->d_parent);
|
364 |
|
|
ret = PTR_ERR(old_emd);
|
365 |
|
|
if (IS_ERR(old_emd))
|
366 |
|
|
goto out;
|
367 |
|
|
|
368 |
|
|
umsdos_lockcreate2 (old_dir, new_dir);
|
369 |
|
|
|
370 |
|
|
ret = umsdos_findentry(old_emd->d_parent, &old_info, 0);
|
371 |
|
|
if (ret)
|
372 |
|
|
goto out_unlock;
|
373 |
|
|
|
374 |
|
|
err = umsdos_findentry(new_dentry->d_parent, &new_info, 0);
|
375 |
|
|
if (err == 0) {
|
376 |
|
|
/* check whether it _really_ exists ... */
|
377 |
|
|
ret = -EEXIST;
|
378 |
|
|
if (new_dentry->d_inode)
|
379 |
|
|
goto out_unlock;
|
380 |
|
|
|
381 |
|
|
/* bogus lookup? complain and fix up the EMD ... */
|
382 |
|
|
printk(KERN_WARNING
|
383 |
|
|
"umsdos_rename_f: entry %s/%s exists, inode NULL??\n",
|
384 |
|
|
new_dentry->d_parent->d_name.name, new_info.entry.name);
|
385 |
|
|
err = umsdos_delentry(new_dentry->d_parent, &new_info,
|
386 |
|
|
S_ISDIR(new_info.entry.mode));
|
387 |
|
|
}
|
388 |
|
|
|
389 |
|
|
umsdos_ren_init (&new_info, &old_info);
|
390 |
|
|
if (flags)
|
391 |
|
|
new_info.entry.flags = flags;
|
392 |
|
|
ret = umsdos_newentry (new_dentry->d_parent, &new_info);
|
393 |
|
|
if (ret)
|
394 |
|
|
goto out_unlock;
|
395 |
|
|
|
396 |
|
|
/* If we're moving a hardlink, drop it first */
|
397 |
|
|
if (old_info.entry.flags & UMSDOS_HLINK) {
|
398 |
|
|
d_drop(old_dentry);
|
399 |
|
|
}
|
400 |
|
|
|
401 |
|
|
old = umsdos_covered(old_dentry->d_parent, old_info.fake.fname,
|
402 |
|
|
old_info.fake.len);
|
403 |
|
|
ret = PTR_ERR(old);
|
404 |
|
|
if (IS_ERR(old))
|
405 |
|
|
goto out_unlock;
|
406 |
|
|
/* make sure it's the same inode! */
|
407 |
|
|
ret = -ENOENT;
|
408 |
|
|
/*
|
409 |
|
|
* note: for hardlinks they will be different!
|
410 |
|
|
* old_inode will contain inode of .LINKxxx file containing data, and
|
411 |
|
|
* old->d_inode will contain inode of file containing path to .LINKxxx file
|
412 |
|
|
*/
|
413 |
|
|
if (!(old_info.entry.flags & UMSDOS_HLINK)) {
|
414 |
|
|
if (old->d_inode != old_inode)
|
415 |
|
|
goto out_dput;
|
416 |
|
|
}
|
417 |
|
|
|
418 |
|
|
new = umsdos_covered(new_dentry->d_parent, new_info.fake.fname,
|
419 |
|
|
new_info.fake.len);
|
420 |
|
|
ret = PTR_ERR(new);
|
421 |
|
|
if (IS_ERR(new))
|
422 |
|
|
goto out_dput;
|
423 |
|
|
|
424 |
|
|
/* Do the msdos-level rename */
|
425 |
|
|
ret = msdos_rename (old_dir, old, new_dir, new);
|
426 |
|
|
|
427 |
|
|
dput(new);
|
428 |
|
|
|
429 |
|
|
/* If the rename failed, remove the new EMD entry */
|
430 |
|
|
if (ret != 0) {
|
431 |
|
|
umsdos_delentry (new_dentry->d_parent, &new_info,
|
432 |
|
|
S_ISDIR (new_info.entry.mode));
|
433 |
|
|
goto out_dput;
|
434 |
|
|
}
|
435 |
|
|
|
436 |
|
|
/*
|
437 |
|
|
* Rename successful ... remove the old name from the EMD.
|
438 |
|
|
* Note that we use the EMD parent here, as the old dentry
|
439 |
|
|
* may have moved to a new parent ...
|
440 |
|
|
*/
|
441 |
|
|
err = umsdos_delentry (old_emd->d_parent, &old_info,
|
442 |
|
|
S_ISDIR (old_info.entry.mode));
|
443 |
|
|
if (err) {
|
444 |
|
|
/* Failed? Complain a bit, but don't fail the operation */
|
445 |
|
|
printk(KERN_WARNING
|
446 |
|
|
"umsdos_rename_f: delentry %s/%s failed, error=%d\n",
|
447 |
|
|
old_emd->d_parent->d_name.name, old_info.entry.name,
|
448 |
|
|
err);
|
449 |
|
|
}
|
450 |
|
|
|
451 |
|
|
/*
|
452 |
|
|
* Update f_pos so notify_change will succeed
|
453 |
|
|
* if the file was already in use.
|
454 |
|
|
*/
|
455 |
|
|
umsdos_set_dirinfo_new(old_dentry, new_info.f_pos);
|
456 |
|
|
|
457 |
|
|
/* dput() the dentry if we haven't already */
|
458 |
|
|
out_dput:
|
459 |
|
|
dput(old);
|
460 |
|
|
|
461 |
|
|
out_unlock:
|
462 |
|
|
dput(old_emd);
|
463 |
|
|
umsdos_unlockcreate (old_dir);
|
464 |
|
|
umsdos_unlockcreate (new_dir);
|
465 |
|
|
|
466 |
|
|
out:
|
467 |
|
|
Printk ((" _ret=%d\n", ret));
|
468 |
|
|
return ret;
|
469 |
|
|
}
|
470 |
|
|
|
471 |
|
|
/*
|
472 |
|
|
* Setup a Symbolic link or a (pseudo) hard link
|
473 |
|
|
* Return a negative error code or 0 if OK.
|
474 |
|
|
*/
|
475 |
|
|
/* #Specification: symbolic links / strategy
|
476 |
|
|
* A symbolic link is simply a file which holds a path. It is
|
477 |
|
|
* implemented as a normal MSDOS file (not very space efficient :-()
|
478 |
|
|
*
|
479 |
|
|
* I see two different ways to do this: One is to place the link data
|
480 |
|
|
* in unused entries of the EMD file; the other is to have a separate
|
481 |
|
|
* file dedicated to hold all symbolic links data.
|
482 |
|
|
*
|
483 |
|
|
* Let's go for simplicity...
|
484 |
|
|
*/
|
485 |
|
|
|
486 |
|
|
/*
|
487 |
|
|
* AV. Should be called with dir->i_sem down.
|
488 |
|
|
*/
|
489 |
|
|
static int umsdos_symlink_x (struct inode *dir, struct dentry *dentry,
|
490 |
|
|
const char *symname, int mode, char flags)
|
491 |
|
|
{
|
492 |
|
|
int ret, len;
|
493 |
|
|
|
494 |
|
|
ret = umsdos_create_any (dir, dentry, mode, 0, flags);
|
495 |
|
|
if (ret) {
|
496 |
|
|
printk(KERN_WARNING
|
497 |
|
|
"umsdos_symlink: create failed, ret=%d\n", ret);
|
498 |
|
|
goto out;
|
499 |
|
|
}
|
500 |
|
|
|
501 |
|
|
len = strlen (symname) + 1;
|
502 |
|
|
ret = block_symlink(dentry->d_inode, symname, len);
|
503 |
|
|
if (ret < 0)
|
504 |
|
|
goto out_unlink;
|
505 |
|
|
out:
|
506 |
|
|
return ret;
|
507 |
|
|
|
508 |
|
|
out_unlink:
|
509 |
|
|
printk(KERN_WARNING "umsdos_symlink: write failed, unlinking\n");
|
510 |
|
|
UMSDOS_unlink (dir, dentry);
|
511 |
|
|
d_drop(dentry);
|
512 |
|
|
goto out;
|
513 |
|
|
}
|
514 |
|
|
|
515 |
|
|
/*
|
516 |
|
|
* Setup a Symbolic link.
|
517 |
|
|
* Return a negative error code or 0 if OK.
|
518 |
|
|
*/
|
519 |
|
|
int UMSDOS_symlink ( struct inode *dir, struct dentry *dentry,
|
520 |
|
|
const char *symname)
|
521 |
|
|
{
|
522 |
|
|
return umsdos_symlink_x (dir, dentry, symname, S_IFLNK | 0777, 0);
|
523 |
|
|
}
|
524 |
|
|
|
525 |
|
|
/*
|
526 |
|
|
* Add a link to an inode in a directory
|
527 |
|
|
*/
|
528 |
|
|
int UMSDOS_link (struct dentry *olddentry, struct inode *dir,
|
529 |
|
|
struct dentry *dentry)
|
530 |
|
|
{
|
531 |
|
|
struct inode *oldinode = olddentry->d_inode;
|
532 |
|
|
struct inode *olddir = olddentry->d_parent->d_inode;
|
533 |
|
|
struct dentry *temp;
|
534 |
|
|
char *path;
|
535 |
|
|
unsigned long buffer;
|
536 |
|
|
int ret;
|
537 |
|
|
struct umsdos_info old_info;
|
538 |
|
|
struct umsdos_info hid_info;
|
539 |
|
|
|
540 |
|
|
#ifdef UMSDOS_DEBUG_VERBOSE
|
541 |
|
|
printk("umsdos_link: new %s/%s -> %s/%s\n",
|
542 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
543 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name);
|
544 |
|
|
#endif
|
545 |
|
|
|
546 |
|
|
ret = -EPERM;
|
547 |
|
|
if (S_ISDIR (oldinode->i_mode))
|
548 |
|
|
goto out;
|
549 |
|
|
|
550 |
|
|
ret = umsdos_nevercreat (dir, dentry, -EPERM);
|
551 |
|
|
if (ret)
|
552 |
|
|
goto out;
|
553 |
|
|
|
554 |
|
|
ret = -ENOMEM;
|
555 |
|
|
buffer = get_free_page(GFP_KERNEL);
|
556 |
|
|
if (!buffer)
|
557 |
|
|
goto out;
|
558 |
|
|
|
559 |
|
|
/*
|
560 |
|
|
* Lock the link parent if it's not the same directory.
|
561 |
|
|
*/
|
562 |
|
|
ret = -EDEADLOCK;
|
563 |
|
|
if (olddir != dir) {
|
564 |
|
|
if (atomic_read(&olddir->i_sem.count) < 1)
|
565 |
|
|
goto out_free;
|
566 |
|
|
down(&olddir->i_sem);
|
567 |
|
|
}
|
568 |
|
|
|
569 |
|
|
/*
|
570 |
|
|
* Parse the name and get the visible directory entry.
|
571 |
|
|
*/
|
572 |
|
|
ret = umsdos_parse (olddentry->d_name.name, olddentry->d_name.len,
|
573 |
|
|
&old_info);
|
574 |
|
|
if (ret)
|
575 |
|
|
goto out_unlock;
|
576 |
|
|
ret = umsdos_findentry (olddentry->d_parent, &old_info, 1);
|
577 |
|
|
if (ret) {
|
578 |
|
|
printk("UMSDOS_link: %s/%s not in EMD, ret=%d\n",
|
579 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name, ret);
|
580 |
|
|
goto out_unlock;
|
581 |
|
|
}
|
582 |
|
|
|
583 |
|
|
/*
|
584 |
|
|
* If the visible dentry is a pseudo-hardlink, the original
|
585 |
|
|
* file must be already hidden.
|
586 |
|
|
*/
|
587 |
|
|
if (!(old_info.entry.flags & UMSDOS_HLINK)) {
|
588 |
|
|
int err;
|
589 |
|
|
|
590 |
|
|
/* create a hidden link name */
|
591 |
|
|
ret = umsdos_newhidden (olddentry->d_parent, &hid_info);
|
592 |
|
|
if (ret) {
|
593 |
|
|
printk("umsdos_link: can't make hidden %s/%s, ret=%d\n",
|
594 |
|
|
olddentry->d_parent->d_name.name, hid_info.entry.name, ret);
|
595 |
|
|
goto out_unlock;
|
596 |
|
|
}
|
597 |
|
|
|
598 |
|
|
/*
|
599 |
|
|
* Make a dentry and rename the original file ...
|
600 |
|
|
*/
|
601 |
|
|
temp = umsdos_lookup_dentry(olddentry->d_parent,
|
602 |
|
|
hid_info.entry.name,
|
603 |
|
|
hid_info.entry.name_len, 0);
|
604 |
|
|
ret = PTR_ERR(temp);
|
605 |
|
|
if (IS_ERR(temp)) {
|
606 |
|
|
printk("umsdos_link: lookup %s/%s failed, ret=%d\n",
|
607 |
|
|
dentry->d_parent->d_name.name, hid_info.entry.name, ret);
|
608 |
|
|
goto cleanup;
|
609 |
|
|
}
|
610 |
|
|
/* rename the link to the hidden location ... */
|
611 |
|
|
ret = umsdos_rename_f(olddir, olddentry, olddir, temp,
|
612 |
|
|
UMSDOS_HIDDEN);
|
613 |
|
|
d_move(olddentry, temp);
|
614 |
|
|
dput(temp);
|
615 |
|
|
if (ret) {
|
616 |
|
|
printk("umsdos_link: rename to %s/%s failed, ret=%d\n",
|
617 |
|
|
temp->d_parent->d_name.name, temp->d_name.name, ret);
|
618 |
|
|
goto cleanup;
|
619 |
|
|
}
|
620 |
|
|
/*
|
621 |
|
|
* Capture the path to the hidden link.
|
622 |
|
|
*/
|
623 |
|
|
path = umsdos_d_path(olddentry, (char *) buffer, PAGE_SIZE);
|
624 |
|
|
if (IS_ERR(path)) {
|
625 |
|
|
ret = PTR_ERR(path);
|
626 |
|
|
goto cleanup;
|
627 |
|
|
}
|
628 |
|
|
Printk(("umsdos_link: hidden link path=%s\n", path));
|
629 |
|
|
|
630 |
|
|
/* mark the inode as a hardlink */
|
631 |
|
|
oldinode->u.umsdos_i.i_is_hlink = 1;
|
632 |
|
|
|
633 |
|
|
/*
|
634 |
|
|
* Recreate a dentry for the original name and symlink it,
|
635 |
|
|
* then symlink the new dentry. Don't give up if one fails,
|
636 |
|
|
* or we'll lose the file completely!
|
637 |
|
|
*
|
638 |
|
|
* Note: this counts as the "original" reference, so we
|
639 |
|
|
* don't increment i_nlink for this one.
|
640 |
|
|
*/
|
641 |
|
|
temp = umsdos_lookup_dentry(olddentry->d_parent,
|
642 |
|
|
old_info.entry.name,
|
643 |
|
|
old_info.entry.name_len, 0);
|
644 |
|
|
ret = PTR_ERR(temp);
|
645 |
|
|
if (!IS_ERR(temp)) {
|
646 |
|
|
ret = umsdos_symlink_x (olddir, temp, path,
|
647 |
|
|
S_IFREG | 0777, UMSDOS_HLINK);
|
648 |
|
|
dput(temp);
|
649 |
|
|
}
|
650 |
|
|
|
651 |
|
|
/* This symlink increments i_nlink (see below.) */
|
652 |
|
|
err = umsdos_symlink_x (dir, dentry, path,
|
653 |
|
|
S_IFREG | 0777, UMSDOS_HLINK);
|
654 |
|
|
/* fold the two errors */
|
655 |
|
|
if (!ret)
|
656 |
|
|
ret = err;
|
657 |
|
|
goto out_unlock;
|
658 |
|
|
|
659 |
|
|
/* creation failed ... remove the link entry */
|
660 |
|
|
cleanup:
|
661 |
|
|
printk("umsdos_link: link failed, ret=%d, removing %s/%s\n",
|
662 |
|
|
ret, olddentry->d_parent->d_name.name, hid_info.entry.name);
|
663 |
|
|
err = umsdos_delentry(olddentry->d_parent, &hid_info, 0);
|
664 |
|
|
goto out_unlock;
|
665 |
|
|
}
|
666 |
|
|
|
667 |
|
|
Printk(("UMSDOS_link: %s/%s already hidden\n",
|
668 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name));
|
669 |
|
|
/*
|
670 |
|
|
* The original file is already hidden, and we need to get
|
671 |
|
|
* the dentry for its real name, not the visible name.
|
672 |
|
|
* N.B. make sure it's the hidden inode ...
|
673 |
|
|
*/
|
674 |
|
|
if (!oldinode->u.umsdos_i.i_is_hlink)
|
675 |
|
|
printk("UMSDOS_link: %s/%s hidden, ino=%ld not hlink??\n",
|
676 |
|
|
olddentry->d_parent->d_name.name,
|
677 |
|
|
olddentry->d_name.name, oldinode->i_ino);
|
678 |
|
|
|
679 |
|
|
/*
|
680 |
|
|
* In order to get the correct (real) inode, we just drop
|
681 |
|
|
* the original dentry.
|
682 |
|
|
*/
|
683 |
|
|
d_drop(olddentry);
|
684 |
|
|
Printk(("UMSDOS_link: hard link %s/%s, fake=%s\n",
|
685 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name, old_info.fake.fname));
|
686 |
|
|
|
687 |
|
|
/* Do a real lookup to get the short name dentry */
|
688 |
|
|
temp = umsdos_covered(olddentry->d_parent, old_info.fake.fname,
|
689 |
|
|
old_info.fake.len);
|
690 |
|
|
ret = PTR_ERR(temp);
|
691 |
|
|
if (IS_ERR(temp))
|
692 |
|
|
goto out_unlock;
|
693 |
|
|
|
694 |
|
|
/* now resolve the link ... */
|
695 |
|
|
temp = umsdos_solve_hlink(temp);
|
696 |
|
|
ret = PTR_ERR(temp);
|
697 |
|
|
if (IS_ERR(temp))
|
698 |
|
|
goto out_unlock;
|
699 |
|
|
path = umsdos_d_path(temp, (char *) buffer, PAGE_SIZE);
|
700 |
|
|
dput(temp);
|
701 |
|
|
if (IS_ERR(path))
|
702 |
|
|
goto out_unlock;
|
703 |
|
|
Printk(("umsdos_link: %s/%s already hidden, path=%s\n",
|
704 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name, path));
|
705 |
|
|
|
706 |
|
|
/* finally we can symlink it ... */
|
707 |
|
|
ret = umsdos_symlink_x (dir, dentry, path, S_IFREG | 0777,UMSDOS_HLINK);
|
708 |
|
|
|
709 |
|
|
out_unlock:
|
710 |
|
|
/* remain locked for the call to notify_change ... */
|
711 |
|
|
if (ret == 0) {
|
712 |
|
|
struct iattr newattrs;
|
713 |
|
|
|
714 |
|
|
/* Do a real lookup to get the short name dentry */
|
715 |
|
|
temp = umsdos_covered(olddentry->d_parent,
|
716 |
|
|
old_info.fake.fname,
|
717 |
|
|
old_info.fake.len);
|
718 |
|
|
ret = PTR_ERR(temp);
|
719 |
|
|
if (IS_ERR(temp))
|
720 |
|
|
goto out_unlock2;
|
721 |
|
|
|
722 |
|
|
/* now resolve the link ... */
|
723 |
|
|
temp = umsdos_solve_hlink(temp);
|
724 |
|
|
ret = PTR_ERR(temp);
|
725 |
|
|
if (IS_ERR(temp))
|
726 |
|
|
goto out_unlock2;
|
727 |
|
|
|
728 |
|
|
|
729 |
|
|
#ifdef UMSDOS_PARANOIA
|
730 |
|
|
if (!oldinode->u.umsdos_i.i_is_hlink)
|
731 |
|
|
printk("UMSDOS_link: %s/%s, ino=%ld, not marked as hlink!\n",
|
732 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name, oldinode->i_ino);
|
733 |
|
|
#endif
|
734 |
|
|
temp->d_inode->i_nlink++;
|
735 |
|
|
Printk(("UMSDOS_link: linked %s/%s, ino=%ld, nlink=%d\n",
|
736 |
|
|
olddentry->d_parent->d_name.name, olddentry->d_name.name,
|
737 |
|
|
oldinode->i_ino, oldinode->i_nlink));
|
738 |
|
|
newattrs.ia_valid = 0;
|
739 |
|
|
ret = umsdos_notify_change_locked(temp, &newattrs);
|
740 |
|
|
if (ret == 0)
|
741 |
|
|
mark_inode_dirty(temp->d_inode);
|
742 |
|
|
dput(temp);
|
743 |
|
|
out_unlock2:
|
744 |
|
|
if (ret == 0)
|
745 |
|
|
mark_inode_dirty(olddentry->d_inode);
|
746 |
|
|
}
|
747 |
|
|
if (olddir != dir)
|
748 |
|
|
up(&olddir->i_sem);
|
749 |
|
|
|
750 |
|
|
out_free:
|
751 |
|
|
free_page(buffer);
|
752 |
|
|
out:
|
753 |
|
|
Printk (("umsdos_link %d\n", ret));
|
754 |
|
|
return ret;
|
755 |
|
|
}
|
756 |
|
|
|
757 |
|
|
|
758 |
|
|
/*
|
759 |
|
|
* Add a sub-directory in a directory
|
760 |
|
|
*/
|
761 |
|
|
/* #Specification: mkdir / Directory already exist in DOS
|
762 |
|
|
* We do the same thing as for file creation.
|
763 |
|
|
* For all user it is an error.
|
764 |
|
|
*/
|
765 |
|
|
/* #Specification: mkdir / umsdos directory / create EMD
|
766 |
|
|
* When we created a new sub-directory in a UMSDOS
|
767 |
|
|
* directory (one with full UMSDOS semantics), we
|
768 |
|
|
* create immediately an EMD file in the new
|
769 |
|
|
* sub-directory so it inherits UMSDOS semantics.
|
770 |
|
|
*/
|
771 |
|
|
int UMSDOS_mkdir (struct inode *dir, struct dentry *dentry, int mode)
|
772 |
|
|
{
|
773 |
|
|
struct dentry *temp;
|
774 |
|
|
struct inode *inode;
|
775 |
|
|
int ret, err;
|
776 |
|
|
struct umsdos_info info;
|
777 |
|
|
|
778 |
|
|
ret = umsdos_nevercreat (dir, dentry, -EEXIST);
|
779 |
|
|
if (ret)
|
780 |
|
|
goto out;
|
781 |
|
|
|
782 |
|
|
ret = umsdos_parse (dentry->d_name.name, dentry->d_name.len, &info);
|
783 |
|
|
if (ret)
|
784 |
|
|
goto out;
|
785 |
|
|
|
786 |
|
|
info.entry.mode = mode | S_IFDIR;
|
787 |
|
|
info.entry.rdev = 0;
|
788 |
|
|
info.entry.uid = current->fsuid;
|
789 |
|
|
info.entry.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
|
790 |
|
|
info.entry.ctime = info.entry.atime = info.entry.mtime = CURRENT_TIME;
|
791 |
|
|
info.entry.flags = 0;
|
792 |
|
|
info.entry.nlink = 1;
|
793 |
|
|
ret = umsdos_newentry (dentry->d_parent, &info);
|
794 |
|
|
if (ret)
|
795 |
|
|
goto out;
|
796 |
|
|
|
797 |
|
|
/* lookup the short name dentry */
|
798 |
|
|
temp = umsdos_covered(dentry->d_parent, info.fake.fname, info.fake.len);
|
799 |
|
|
ret = PTR_ERR(temp);
|
800 |
|
|
if (IS_ERR(temp))
|
801 |
|
|
goto out_remove;
|
802 |
|
|
|
803 |
|
|
/* Make sure the short name doesn't exist */
|
804 |
|
|
ret = -EEXIST;
|
805 |
|
|
if (temp->d_inode) {
|
806 |
|
|
printk("umsdos_mkdir: short name %s/%s exists\n",
|
807 |
|
|
dentry->d_parent->d_name.name, info.fake.fname);
|
808 |
|
|
goto out_remove_dput;
|
809 |
|
|
}
|
810 |
|
|
|
811 |
|
|
ret = msdos_mkdir (dir, temp, mode);
|
812 |
|
|
if (ret)
|
813 |
|
|
goto out_remove_dput;
|
814 |
|
|
|
815 |
|
|
/*
|
816 |
|
|
* Lock the inode to protect the EMD creation ...
|
817 |
|
|
*/
|
818 |
|
|
inode = temp->d_inode;
|
819 |
|
|
down(&inode->i_sem);
|
820 |
|
|
|
821 |
|
|
atomic_inc(&inode->i_count);
|
822 |
|
|
d_instantiate(dentry, inode);
|
823 |
|
|
|
824 |
|
|
/* N.B. this should have an option to create the EMD ... */
|
825 |
|
|
umsdos_lookup_patch_new(dentry, &info);
|
826 |
|
|
|
827 |
|
|
/*
|
828 |
|
|
* Create the EMD file, and set up the dir so it is
|
829 |
|
|
* promoted to EMD with the EMD file invisible.
|
830 |
|
|
*
|
831 |
|
|
* N.B. error return if EMD fails?
|
832 |
|
|
*/
|
833 |
|
|
err = umsdos_make_emd(dentry);
|
834 |
|
|
umsdos_setup_dir(dentry);
|
835 |
|
|
|
836 |
|
|
up(&inode->i_sem);
|
837 |
|
|
dput(temp);
|
838 |
|
|
|
839 |
|
|
out:
|
840 |
|
|
Printk(("umsdos_mkdir: %s/%s, ret=%d\n",
|
841 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name, ret));
|
842 |
|
|
return ret;
|
843 |
|
|
|
844 |
|
|
/* an error occurred ... remove EMD entry. */
|
845 |
|
|
out_remove_dput:
|
846 |
|
|
dput(temp);
|
847 |
|
|
out_remove:
|
848 |
|
|
umsdos_delentry (dentry->d_parent, &info, 1);
|
849 |
|
|
goto out;
|
850 |
|
|
}
|
851 |
|
|
|
852 |
|
|
/*
|
853 |
|
|
* Add a new device special file into a directory.
|
854 |
|
|
*
|
855 |
|
|
* #Specification: Special files / strategy
|
856 |
|
|
* Device special file, pipes, etc ... are created like normal
|
857 |
|
|
* file in the msdos file system. Of course they remain empty.
|
858 |
|
|
*
|
859 |
|
|
* One strategy was to create those files only in the EMD file
|
860 |
|
|
* since they were not important for MSDOS. The problem with
|
861 |
|
|
* that, is that there were not getting inode number allocated.
|
862 |
|
|
* The MSDOS filesystems is playing a nice game to fake inode
|
863 |
|
|
* number, so why not use it.
|
864 |
|
|
*
|
865 |
|
|
* The absence of inode number compatible with those allocated
|
866 |
|
|
* for ordinary files was causing major trouble with hard link
|
867 |
|
|
* in particular and other parts of the kernel I guess.
|
868 |
|
|
*/
|
869 |
|
|
int UMSDOS_mknod (struct inode *dir, struct dentry *dentry,
|
870 |
|
|
int mode, int rdev)
|
871 |
|
|
{
|
872 |
|
|
return umsdos_create_any (dir, dentry, mode, rdev, 0);
|
873 |
|
|
}
|
874 |
|
|
|
875 |
|
|
/*
|
876 |
|
|
* Remove a sub-directory.
|
877 |
|
|
*/
|
878 |
|
|
int UMSDOS_rmdir (struct inode *dir, struct dentry *dentry)
|
879 |
|
|
{
|
880 |
|
|
struct dentry *temp;
|
881 |
|
|
int ret, err, empty;
|
882 |
|
|
struct umsdos_info info;
|
883 |
|
|
|
884 |
|
|
ret = umsdos_nevercreat (dir, dentry, -EPERM);
|
885 |
|
|
if (ret)
|
886 |
|
|
goto out;
|
887 |
|
|
|
888 |
|
|
ret = -EBUSY;
|
889 |
|
|
if (!d_unhashed(dentry))
|
890 |
|
|
goto out;
|
891 |
|
|
|
892 |
|
|
/* check whether the EMD is empty */
|
893 |
|
|
ret = -ENOTEMPTY;
|
894 |
|
|
empty = umsdos_isempty (dentry);
|
895 |
|
|
|
896 |
|
|
/* Have to remove the EMD file? */
|
897 |
|
|
if (empty == 1) {
|
898 |
|
|
struct dentry *demd;
|
899 |
|
|
|
900 |
|
|
demd = umsdos_get_emd_dentry(dentry);
|
901 |
|
|
if (!IS_ERR(demd)) {
|
902 |
|
|
err = -ENOENT;
|
903 |
|
|
if (demd->d_inode)
|
904 |
|
|
err = msdos_unlink (dentry->d_inode, demd);
|
905 |
|
|
Printk (("UMSDOS_rmdir: unlinking empty EMD err=%d", err));
|
906 |
|
|
#ifdef UMSDOS_PARANOIA
|
907 |
|
|
if (err)
|
908 |
|
|
printk("umsdos_rmdir: EMD %s/%s unlink failed, err=%d\n",
|
909 |
|
|
demd->d_parent->d_name.name, demd->d_name.name, err);
|
910 |
|
|
#endif
|
911 |
|
|
if (!err) {
|
912 |
|
|
d_delete(demd);
|
913 |
|
|
ret = 0;
|
914 |
|
|
}
|
915 |
|
|
dput(demd);
|
916 |
|
|
}
|
917 |
|
|
} else if (empty == 2)
|
918 |
|
|
ret = 0;
|
919 |
|
|
if (ret)
|
920 |
|
|
goto out;
|
921 |
|
|
|
922 |
|
|
umsdos_parse (dentry->d_name.name, dentry->d_name.len, &info);
|
923 |
|
|
/* Call findentry to complete the mangling */
|
924 |
|
|
umsdos_findentry (dentry->d_parent, &info, 2);
|
925 |
|
|
temp = umsdos_covered(dentry->d_parent, info.fake.fname, info.fake.len);
|
926 |
|
|
ret = PTR_ERR(temp);
|
927 |
|
|
if (IS_ERR(temp))
|
928 |
|
|
goto out;
|
929 |
|
|
/*
|
930 |
|
|
* Attempt to remove the msdos name.
|
931 |
|
|
*/
|
932 |
|
|
ret = msdos_rmdir (dir, temp);
|
933 |
|
|
if (ret && ret != -ENOENT)
|
934 |
|
|
goto out_dput;
|
935 |
|
|
|
936 |
|
|
d_delete(temp);
|
937 |
|
|
/* OK so far ... remove the name from the EMD */
|
938 |
|
|
ret = umsdos_delentry (dentry->d_parent, &info, 1);
|
939 |
|
|
#ifdef UMSDOS_PARANOIA
|
940 |
|
|
if (ret)
|
941 |
|
|
printk("umsdos_rmdir: delentry %s failed, ret=%d\n", info.entry.name, ret);
|
942 |
|
|
#endif
|
943 |
|
|
|
944 |
|
|
/* dput() temp if we didn't do it above */
|
945 |
|
|
out_dput:
|
946 |
|
|
dput(temp);
|
947 |
|
|
|
948 |
|
|
out:
|
949 |
|
|
Printk (("umsdos_rmdir %d\n", ret));
|
950 |
|
|
return ret;
|
951 |
|
|
}
|
952 |
|
|
|
953 |
|
|
|
954 |
|
|
/*
|
955 |
|
|
* Remove a file from the directory.
|
956 |
|
|
*
|
957 |
|
|
* #Specification: hard link / deleting a link
|
958 |
|
|
* When we delete a file and this file is a link,
|
959 |
|
|
* we must subtract 1 from the nlink field of the
|
960 |
|
|
* hidden link.
|
961 |
|
|
*
|
962 |
|
|
* If the count goes to 0, we delete this hidden
|
963 |
|
|
* link too.
|
964 |
|
|
*/
|
965 |
|
|
int UMSDOS_unlink (struct inode *dir, struct dentry *dentry)
|
966 |
|
|
{
|
967 |
|
|
struct dentry *temp, *link = NULL;
|
968 |
|
|
struct inode *inode;
|
969 |
|
|
int ret;
|
970 |
|
|
struct umsdos_info info;
|
971 |
|
|
|
972 |
|
|
Printk(("UMSDOS_unlink: entering %s/%s\n",
|
973 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name));
|
974 |
|
|
|
975 |
|
|
ret = umsdos_nevercreat (dir, dentry, -EPERM);
|
976 |
|
|
if (ret)
|
977 |
|
|
goto out;
|
978 |
|
|
|
979 |
|
|
ret = umsdos_parse (dentry->d_name.name, dentry->d_name.len, &info);
|
980 |
|
|
if (ret)
|
981 |
|
|
goto out;
|
982 |
|
|
|
983 |
|
|
umsdos_lockcreate (dir);
|
984 |
|
|
ret = umsdos_findentry (dentry->d_parent, &info, 1);
|
985 |
|
|
if (ret) {
|
986 |
|
|
printk("UMSDOS_unlink: %s/%s not in EMD, ret=%d\n",
|
987 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name, ret);
|
988 |
|
|
goto out_unlock;
|
989 |
|
|
}
|
990 |
|
|
|
991 |
|
|
Printk (("UMSDOS_unlink %.*s ", info.fake.len, info.fake.fname));
|
992 |
|
|
|
993 |
|
|
/*
|
994 |
|
|
* Note! If this is a hardlink and the names are aliased,
|
995 |
|
|
* the short-name lookup will return the hardlink dentry.
|
996 |
|
|
* In order to get the correct (real) inode, we just drop
|
997 |
|
|
* the original dentry.
|
998 |
|
|
*/
|
999 |
|
|
if (info.entry.flags & UMSDOS_HLINK) {
|
1000 |
|
|
d_drop(dentry);
|
1001 |
|
|
}
|
1002 |
|
|
|
1003 |
|
|
/* Do a real lookup to get the short name dentry */
|
1004 |
|
|
temp = umsdos_covered(dentry->d_parent, info.fake.fname, info.fake.len);
|
1005 |
|
|
ret = PTR_ERR(temp);
|
1006 |
|
|
if (IS_ERR(temp))
|
1007 |
|
|
goto out_unlock;
|
1008 |
|
|
|
1009 |
|
|
/*
|
1010 |
|
|
* Resolve hardlinks now, but defer processing until later.
|
1011 |
|
|
*/
|
1012 |
|
|
if (info.entry.flags & UMSDOS_HLINK) {
|
1013 |
|
|
link = umsdos_solve_hlink(dget(temp));
|
1014 |
|
|
}
|
1015 |
|
|
|
1016 |
|
|
/* Delete the EMD entry */
|
1017 |
|
|
ret = umsdos_delentry (dentry->d_parent, &info, 0);
|
1018 |
|
|
if (ret && ret != -ENOENT) {
|
1019 |
|
|
printk(KERN_WARNING "UMSDOS_unlink: delentry %s, error=%d\n",
|
1020 |
|
|
info.entry.name, ret);
|
1021 |
|
|
goto out_dput;
|
1022 |
|
|
}
|
1023 |
|
|
|
1024 |
|
|
ret = msdos_unlink(dir, temp);
|
1025 |
|
|
if (!ret)
|
1026 |
|
|
d_delete(temp);
|
1027 |
|
|
#ifdef UMSDOS_PARANOIA
|
1028 |
|
|
if (ret)
|
1029 |
|
|
printk("umsdos_unlink: %s/%s unlink failed, ret=%d\n",
|
1030 |
|
|
temp->d_parent->d_name.name, temp->d_name.name, ret);
|
1031 |
|
|
#endif
|
1032 |
|
|
|
1033 |
|
|
/* dput() temp if we didn't do it above */
|
1034 |
|
|
out_dput:
|
1035 |
|
|
dput(temp);
|
1036 |
|
|
|
1037 |
|
|
out_unlock:
|
1038 |
|
|
umsdos_unlockcreate (dir);
|
1039 |
|
|
|
1040 |
|
|
/*
|
1041 |
|
|
* Now check for deferred handling of a hardlink.
|
1042 |
|
|
*/
|
1043 |
|
|
if (!link)
|
1044 |
|
|
goto out;
|
1045 |
|
|
|
1046 |
|
|
if (IS_ERR(link)) {
|
1047 |
|
|
printk("umsdos_unlink: failed to resolve %s/%s\n",
|
1048 |
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
1049 |
|
|
if (!ret)
|
1050 |
|
|
ret = PTR_ERR(link);
|
1051 |
|
|
goto out;
|
1052 |
|
|
}
|
1053 |
|
|
|
1054 |
|
|
Printk(("umsdos_unlink: link %s/%s deferred, pending ret=%d\n",
|
1055 |
|
|
link->d_parent->d_name.name, link->d_name.name, ret));
|
1056 |
|
|
|
1057 |
|
|
/* already have an error? */
|
1058 |
|
|
if (ret)
|
1059 |
|
|
goto out_cleanup;
|
1060 |
|
|
|
1061 |
|
|
/* make sure the link exists ... */
|
1062 |
|
|
inode = link->d_inode;
|
1063 |
|
|
if (!inode) {
|
1064 |
|
|
printk(KERN_WARNING "umsdos_unlink: hard link not found\n");
|
1065 |
|
|
goto out_cleanup;
|
1066 |
|
|
}
|
1067 |
|
|
|
1068 |
|
|
/*
|
1069 |
|
|
* If this was the last linked reference, delete it now.
|
1070 |
|
|
*
|
1071 |
|
|
* N.B. Deadlock problem? We should be holding the lock
|
1072 |
|
|
* for the hardlink's parent, but another process might
|
1073 |
|
|
* be holding that lock waiting for us to finish ...
|
1074 |
|
|
*/
|
1075 |
|
|
if (inode->i_nlink <= 1) {
|
1076 |
|
|
ret = UMSDOS_unlink (link->d_parent->d_inode, link);
|
1077 |
|
|
if (ret) {
|
1078 |
|
|
printk(KERN_WARNING
|
1079 |
|
|
"umsdos_unlink: link removal failed, ret=%d\n",
|
1080 |
|
|
ret);
|
1081 |
|
|
} else
|
1082 |
|
|
d_delete(link);
|
1083 |
|
|
} else {
|
1084 |
|
|
struct iattr newattrs;
|
1085 |
|
|
inode->i_nlink--;
|
1086 |
|
|
newattrs.ia_valid = 0;
|
1087 |
|
|
ret = umsdos_notify_change_locked(link, &newattrs);
|
1088 |
|
|
if (!ret)
|
1089 |
|
|
mark_inode_dirty(link->d_inode);
|
1090 |
|
|
}
|
1091 |
|
|
|
1092 |
|
|
out_cleanup:
|
1093 |
|
|
d_drop(link);
|
1094 |
|
|
dput(link);
|
1095 |
|
|
|
1096 |
|
|
out:
|
1097 |
|
|
Printk (("umsdos_unlink %d\n", ret));
|
1098 |
|
|
return ret;
|
1099 |
|
|
}
|
1100 |
|
|
|
1101 |
|
|
/*
|
1102 |
|
|
* Rename (move) a file.
|
1103 |
|
|
*/
|
1104 |
|
|
int UMSDOS_rename (struct inode *old_dir, struct dentry *old_dentry,
|
1105 |
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
1106 |
|
|
{
|
1107 |
|
|
int ret;
|
1108 |
|
|
|
1109 |
|
|
ret = umsdos_nevercreat (new_dir, new_dentry, -EEXIST);
|
1110 |
|
|
if (ret)
|
1111 |
|
|
return ret;
|
1112 |
|
|
|
1113 |
|
|
/*
|
1114 |
|
|
* If the target already exists, delete it first.
|
1115 |
|
|
*/
|
1116 |
|
|
if (new_dentry->d_inode) {
|
1117 |
|
|
dget(new_dentry);
|
1118 |
|
|
if (S_ISDIR(old_dentry->d_inode->i_mode))
|
1119 |
|
|
ret = UMSDOS_rmdir (new_dir, new_dentry);
|
1120 |
|
|
else
|
1121 |
|
|
ret = UMSDOS_unlink (new_dir, new_dentry);
|
1122 |
|
|
if (!ret)
|
1123 |
|
|
d_drop(new_dentry);
|
1124 |
|
|
dput(new_dentry);
|
1125 |
|
|
if (ret)
|
1126 |
|
|
return ret;
|
1127 |
|
|
}
|
1128 |
|
|
ret = umsdos_rename_f(old_dir, old_dentry, new_dir, new_dentry, 0);
|
1129 |
|
|
return ret;
|
1130 |
|
|
}
|