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dosfs: Write meta-data only if it changed

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This commit is contained in:
Sebastian Huber
2014-10-23 08:21:26 +02:00
parent 66c1ef9256
commit cf4f962cc0
3 changed files with 40 additions and 17 deletions
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22
cpukit/libfs/src/dosfs/fat_file.c
View File

@@ -174,20 +174,17 @@ fat_file_update(fat_fs_info_t *fs_info, fat_file_fd_t *fat_fd)
* if fat-file descriptor is not marked as "removed", synchronize
* size, first cluster number, write time and date fields of the file
*/
if (!FAT_FILE_IS_REMOVED(fat_fd))
if (!FAT_FILE_IS_REMOVED(fat_fd) && FAT_FILE_HAS_META_DATA_CHANGED(fat_fd))
{
int rc;
if (fat_fd->fat_file_type == FAT_FILE)
{
rc = fat_file_write_first_cluster_num(fs_info, fat_fd);
if (rc != RC_OK)
ret_rc = rc;
rc = fat_file_write_first_cluster_num(fs_info, fat_fd);
if (rc != RC_OK)
ret_rc = rc;
rc = fat_file_write_file_size(fs_info, fat_fd);
if (rc != RC_OK)
ret_rc = rc;
}
rc = fat_file_write_file_size(fs_info, fat_fd);
if (rc != RC_OK)
ret_rc = rc;
rc = fat_file_write_time_and_date(fs_info, fat_fd);
if (rc != RC_OK)
@@ -677,8 +674,9 @@ fat_file_extend(
/* add new chain to the end of existing */
if ( fat_fd->fat_file_size == 0 )
{
fat_fd->map.disk_cln = fat_fd->cln = chain;
fat_fd->map.disk_cln = chain;
fat_fd->map.file_cln = 0;
fat_file_set_first_cluster_num(fat_fd, chain);
}
else
{
@@ -721,7 +719,7 @@ fat_file_extend(
}
*a_length = new_length;
fat_fd->fat_file_size = new_length;
fat_file_set_file_size(fat_fd, new_length);
return RC_OK;
}

31
cpukit/libfs/src/dosfs/fat_file.h
View File

@@ -93,10 +93,19 @@ typedef struct fat_file_fd_s
} fat_file_fd_t;
#define FAT_FILE_REMOVED 0x01
#define FAT_FILE_REMOVED 0x01
#define FAT_FILE_IS_REMOVED(p)\
(((p)->flags & FAT_FILE_REMOVED) ? 1 : 0)
#define FAT_FILE_META_DATA_CHANGED 0x02
static inline bool FAT_FILE_IS_REMOVED(const fat_file_fd_t *fat_fd)
{
return (fat_fd->flags & FAT_FILE_REMOVED) != 0;
}
static inline bool FAT_FILE_HAS_META_DATA_CHANGED(const fat_file_fd_t *fat_fd)
{
return (fat_fd->flags & FAT_FILE_META_DATA_CHANGED) != 0;
}
/* ioctl macros */
#define F_CLU_NUM 0x01
@@ -140,20 +149,36 @@ fat_construct_key(
((pos->ofs >> 5) & (FAT_DIRENTRIES_PER_SEC512 - 1)) );
}
static inline void
fat_file_set_first_cluster_num(fat_file_fd_t *fat_fd, uint32_t cln)
{
fat_fd->cln = cln;
fat_fd->flags |= FAT_FILE_META_DATA_CHANGED;
}
static inline void fat_file_set_file_size(fat_file_fd_t *fat_fd, uint32_t s)
{
fat_fd->fat_file_size = s;
fat_fd->flags |= FAT_FILE_META_DATA_CHANGED;
}
static inline void fat_file_set_ctime(fat_file_fd_t *fat_fd, time_t t)
{
fat_fd->ctime = t;
fat_fd->flags |= FAT_FILE_META_DATA_CHANGED;
}
static inline void fat_file_set_mtime(fat_file_fd_t *fat_fd, time_t t)
{
fat_fd->mtime = t;
fat_fd->flags |= FAT_FILE_META_DATA_CHANGED;
}
static inline void fat_file_set_ctime_mtime(fat_file_fd_t *fat_fd, time_t t)
{
fat_fd->ctime = t;
fat_fd->mtime = t;
fat_fd->flags |= FAT_FILE_META_DATA_CHANGED;
}
/* Prototypes for "fat-file" operations */

4
cpukit/libfs/src/dosfs/msdos_file.c
View File

@@ -108,7 +108,7 @@ msdos_file_write(rtems_libio_t *iop,const void *buffer, size_t count)
*/
iop->offset += ret;
if (iop->offset > fat_fd->fat_file_size)
fat_fd->fat_file_size = iop->offset;
fat_file_set_file_size(fat_fd, (uint32_t) iop->offset);
if (ret > 0)
fat_file_set_ctime_mtime(fat_fd, time(NULL));
@@ -202,7 +202,7 @@ msdos_file_ftruncate(rtems_libio_t *iop, off_t length)
if (rc == RC_OK)
{
fat_fd->fat_file_size = length;
fat_file_set_file_size(fat_fd, length);
fat_file_set_ctime_mtime(fat_fd, time(NULL));
}