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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-05-09 14:33:51 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-05-11 13:58:43 +0200 |
| commit | 86ef0df976faf1b060347a07744814458aa42619 (patch) | |
| tree | d001b836005d059b5aa11cf541093f5027c50d28 /cpukit/libfs/src/dosfs/fat_file.h | |
| parent | libblock: Add RTEMS_BLKIO_PURGEDEV (diff) | |
| download | rtems-86ef0df976faf1b060347a07744814458aa42619.tar.bz2 | |
dosfs: Remove fat_file_datasync()
The fat_file_datasync() read every cluster of the file into the cache
and then synchronized it step-by-step. For unmodified buffers this is a
non-operation. For modified buffers this will wake-up the swapout task
which performs then a single buffer write operation. This is usually
quite inefficient. Firstly we do single buffer writes, secondly we
may perform a lot of unnecessary read operations (for huge files this is
really bad), and thirdly this leads likely to cache evictions.
The synchronization procedure is replaced by a simple
rtems_bdbuf_sync_dev(). This has the side-effect that also buffers not
related to the file are synchronized, but since the modified list is
normally short this should be acceptable.
Diffstat (limited to 'cpukit/libfs/src/dosfs/fat_file.h')
| -rw-r--r-- | cpukit/libfs/src/dosfs/fat_file.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/cpukit/libfs/src/dosfs/fat_file.h b/cpukit/libfs/src/dosfs/fat_file.h index 30614c8f46..3a338a59ea 100644 --- a/cpukit/libfs/src/dosfs/fat_file.h +++ b/cpukit/libfs/src/dosfs/fat_file.h @@ -168,11 +168,6 @@ fat_file_truncate(rtems_filesystem_mount_table_entry_t *mt_entry, uint32_t new_length); int -fat_file_datasync(rtems_filesystem_mount_table_entry_t *mt_entry, - fat_file_fd_t *fat_fd); - - -int fat_file_ioctl(rtems_filesystem_mount_table_entry_t *mt_entry, fat_file_fd_t *fat_fd, int cmd, |