Changes between Version 44 and Version 45 of file_system

Timestamp:

Feb 3, 2016, 12:10:36 AM (8 years ago)

Author:

alain

Comment:

--

file_system

@@ -318 +318 @@
 
 === __unsigned int '''_clusters_release'''( fat_node_t* inode )__ ===
-The following function releases all clusters allocated to a file or directory identified by the <inode> argument, until the end of the FAT linked list. It calls _get_fat_entry() and _set_fat_entry() functions to scan the FAT, and to update the clusters chaining.
+This function releases all clusters allocated to a file or directory identified by the <inode> argument, until the end of the FAT linked list. It calls _get_fat_entry() and _set_fat_entry() functions to scan the FAT, and to update the clusters chaining. The FAT region and the FS-INFO sector on block device are updated.
+
+It returns 0 on success. It returns 1 on error.
+
+=== __unsigned int '''_cluster_allocate'''( fat_inode_t*   inode , unsigned int*  cluster )__ ===
+This function allocates one cluster in FAT to a file (or directory) identified by the <inode> pointer. The allocated cluster index is returned in the <cluster> argument. It allocates also the associated buffers and buffer descriptors in Cache-File. It calls _get_fat_entry() and _set_fat_entry() functions to update the clusters chaining in the Cache-Fat. 
 The FAT region and the FS-INFO sector on block device are updated.
-It returns 0 on success. It returns 1 on error.
-
-=== __unsigned int '''_cluster_allocate'''( fat_inode_t*   inode , unsigned int*  cluster )__ ===
-This function allocates one cluster in FAT to a file (or directory) identified by the <inode> pointer. The allocated cluster index is returned in the
-<cluster> argument. It allocates also the associated buffers and buffer descriptors in Cache-File. It calls _get_fat_entry() and _set_fat_entry() functions to update the clusters chaining in the Cache-Fat. 
-The FAT region and the FS-INFO sector on block device are updated.
+
 It returns 0 on success. It returns 1 on error.
 
@@ -337 +337 @@
 Its first child can be specified (used when adding a cache level).
 The 63 other children are set to NULL.
+
 It returns a pointer to the new Fat-Cache node.
 
 === __fat_inode_t* '''_allocate_one_inode'''( char* name , unsigned int is_dir , unsigned int cluster , unsigned int size , unsigned int count ,  unsigned int dentry , unsigned int cache_allocate )__ ===
 This function allocates and initializes a new inode, using the values defined by the <name>, <is_dir>, <cluster>, <size>, <count>, and <dentry> arguments. If the <cache_allocate> argument is true, an empty cache is allocated.
+
 It returns a pointer on the new inode.
 
@@ -350 +352 @@
 === __unsigned int '''_allocate_one_cluster'''( unsigned int*  cluster )__ ==
 This  function allocates one free cluster from the FAT and returns the cluster index in the <cluster> argument.
-It updates the FAT slot, and the two FAT global variables "first_free_cluster" and "free_clusters_number".
+It updates the FAT slot, and the two FAT descriptor variables "first_free_cluster" and "free_clusters_number".
+
 It returns 0 on success. It returns 1 on error.
 
@@ -356 +359 @@
 This function remove from the file system a file or a directory identified by the <inode> argument. 
 The remove conditions must be checked by the caller. The relevant lock(s) must have been taken by te caller.
+
 It returns 0 on success. It returns 1 on error.
 
@@ -361 +365 @@
 This function returns in the <file_cluster> and <file_size> arguments the cluster index and the size for a file identified by the <pathname> argument, scanning directly the block device DATA region.
 It is intended to be called only by the _fat_load_no_cache() function, as it does not use the dynamically allocated File-Caches, but uses only the 4 Kbytes _fat_buffer_data. 
+
 It returns 0 on success. It returns 1 on error.
 
 === __unsigned int '''_next_cluster_no_cache'''( unsigned int   cluster , unsigned int*  next )__ ===
-This function scan directly the FAT region on the block device,  and returns in the <next> argument the value stored in the fat slot  identified by the <cluster> argument. It is intended to be called only by the _fat_load_no_cache() function, as it does not use the dynamically allocated Fat-Cache, but uses only  the 4 Kbytes _fat_buffer_fat. It returns 0 on success. It returns 1 on error.
+This function scan directly the FAT region on the block device,  and returns in the <next> argument the value stored in the fat slot  identified by the <cluster> argument. It is intended to be called only by the _fat_load_no_cache() function, as it does not use the dynamically allocated Fat-Cache, but uses only  the 4 Kbytes _fat_buffer_fat. 
+
+It returns 0 on success. It returns 1 on error.
 
 === __int '''get_length'''( int offset , int length )__ ===