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dfs_fs.c: optimized redundant loop.

This commit is contained in:
geniusgogo 2013-04-01 02:53:59 +08:00
parent 8d6264af58
commit f95cd9a354
1 changed files with 26 additions and 23 deletions
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49
components/dfs/src/dfs_fs.c
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@ -32,8 +32,10 @@
int dfs_register(const struct dfs_filesystem_operation *ops)
{
int index, result;
int free_index;
result = 0;
free_index = DFS_FILESYSTEM_TYPES_MAX;
/* lock filesystem */
dfs_lock();
@ -41,29 +43,28 @@ int dfs_register(const struct dfs_filesystem_operation *ops)
/* check if this filesystem was already registered */
for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
{
if (filesystem_operation_table[index] != RT_NULL &&
strcmp(filesystem_operation_table[index]->name, ops->name) == 0)
if (filesystem_operation_table[index] == RT_NULL)
{
/* find out an empty filesystem type entry */
if (free_index == DFS_FILESYSTEM_TYPES_MAX)
free_index = index;
}
else if (strcmp(filesystem_operation_table[index]->name, ops->name) == 0)
{
result = -1;
goto err;
}
}
/* find out an empty filesystem type entry */
for (index = 0;
index < DFS_FILESYSTEM_TYPES_MAX && filesystem_operation_table[index] != RT_NULL;
index ++)
;
/* filesystem type table full */
if (index == DFS_FILESYSTEM_TYPES_MAX)
if (free_index == DFS_FILESYSTEM_TYPES_MAX)
{
result = -1;
goto err;
}
/* save the filesystem's operations */
filesystem_operation_table[index] = ops;
filesystem_operation_table[free_index] = ops;
err:
dfs_unlock();
@ -217,7 +218,7 @@ int dfs_mount(const char *device_name,
struct dfs_filesystem *fs;
char *fullpath=RT_NULL;
rt_device_t dev_id;
int index;
int index, free_index;
/* open specific device */
if (device_name != RT_NULL)
@ -241,20 +242,22 @@ int dfs_mount(const char *device_name,
dfs_lock();
for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
{
if (filesystem_operation_table[index] == RT_NULL)
continue;
if (strcmp(filesystem_operation_table[index]->name, filesystemtype) == 0)
break;
}
dfs_unlock();
/* can't find filesystem */
if (index == DFS_FILESYSTEM_TYPES_MAX)
{
rt_set_errno(-DFS_STATUS_ENODEV);
dfs_unlock();
return -1;
}
ops = filesystem_operation_table[index];
dfs_unlock();
/* make full path for special file */
fullpath = dfs_normalize_path(RT_NULL, path);
@ -280,33 +283,33 @@ int dfs_mount(const char *device_name,
dfs_file_close(&fd);
}
free_index = DFS_FILESYSTEMS_MAX;
/* check whether the file system mounted or not */
dfs_lock();
for (index = 0; index < DFS_FILESYSTEMS_MAX; index ++)
{
if (filesystem_table[index].ops != RT_NULL &&
strcmp(filesystem_table[index].path, path) == 0)
if (filesystem_table[index].ops == RT_NULL)
{
/* find out an empty filesystem table entry */
if (free_index == DFS_FILESYSTEMS_MAX)
free_index = index;
}
else if (strcmp(filesystem_table[index].path, path) == 0)
{
rt_set_errno(-DFS_STATUS_EINVAL);
goto err1;
}
}
/* find out an empty filesystem table entry */
for (index = 0;
index < DFS_FILESYSTEMS_MAX && filesystem_table[index].ops != RT_NULL;
index ++)
;
/* can't find en empty filesystem table entry */
if (index == DFS_FILESYSTEMS_MAX)
if (free_index == DFS_FILESYSTEMS_MAX)
{
rt_set_errno(-DFS_STATUS_ENOSPC);
goto err1;
}
/* register file system */
fs = &(filesystem_table[index]);
fs = &(filesystem_table[free_index]);
fs->path = fullpath;
fs->ops = ops;
fs->dev_id = dev_id;