shaba/lvm2
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Code Releases Activity

o Tidy in dm-fs.c

Browse Source 
o Magic number is really magic
 o Check on directory names
This commit is contained in:
steve 2001-09-13 19:41:46 +00:00
parent da49f88a03
commit df3fab4d55
1 changed files with 22 additions and 5 deletions
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27
driver/device-mapper/dm-fs.c
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@ -18,8 +18,8 @@
#include "dm.h"
/* some random number */
#define DM_MAGIC 0x211271
/* some magic number */
#define DM_MAGIC 0x444D4653
static struct super_operations dm_ops;
static struct address_space_operations dm_aops;
@ -46,6 +46,17 @@ struct line_c {
struct file *out;
};
static int is_identifier(char *str, int len)
{
while(len--) {
if (!isalnum(*str) || *str != '_')
return 0;
str++;
}
return 1;
}
/*
* Grabs lines one at a time from the table file.
*/
@ -269,7 +280,8 @@ struct inode *_get_inode(struct super_block *sb, int mode, int dev)
inode->i_atime = inode->i_mtime =
inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
default:
case S_IFBLK:
case S_IFCHR:
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
@ -282,6 +294,8 @@ struct inode *_get_inode(struct super_block *sb, int mode, int dev)
case S_IFLNK:
inode->i_op = &page_symlink_inode_operations;
break;
default:
make_bad_inode(inode);
}
}
return inode;
@ -309,6 +323,9 @@ static int _mkdir(struct inode * dir, struct dentry * dentry, int mode)
int r;
const char *name = (const char *) dentry->d_name.name;
if (!is_identifier(name, dentry->d_name.len))
return -EPERM; /* or EINVAL ? */
r = dm_create(name, -1);
if (r)
return r;
@ -346,7 +363,7 @@ static int _create(struct inode *dir, struct dentry *dentry, int mode)
return 0;
}
static inline int _positive(struct dentry *dentry)
static inline int positive(struct dentry *dentry)
{
return dentry->d_inode && !d_unhashed(dentry);
}
@ -369,7 +386,7 @@ static int _empty(struct dentry *dentry)
while (list != &dentry->d_subdirs) {
struct dentry *de = list_entry(list, struct dentry, d_child);
if (_positive(de)) {
if (positive(de)) {
spin_unlock(&dcache_lock);
return 0;
}