block: Allow devices to indicate whether discarded blocks are zeroed

[mv-sheeva.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2620a8c63571a673f29a802a8144fec5014575f3..891f7d642e5c6789cb05853137a8caa58a21c2c6 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -129,7 +129,7 @@ struct inodes_stat_t {
  * WRITE_SYNC          Like WRITE_SYNC_PLUG, but also unplugs the device
  *                     immediately after submission. The write equivalent
  *                     of READ_SYNC.
- * WRITE_ODIRECT       Special case write for O_DIRECT only.
+ * WRITE_ODIRECT_PLUG  Special case write for O_DIRECT only.
  * SWRITE_SYNC
  * SWRITE_SYNC_PLUG    Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
  *                     See SWRITE.
@@ -151,7 +151,7 @@ struct inodes_stat_t {
 #define READ_META      (READ | (1 << BIO_RW_META))
 #define WRITE_SYNC_PLUG        (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
 #define WRITE_SYNC     (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
-#define WRITE_ODIRECT  (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG))
+#define WRITE_ODIRECT_PLUG     (WRITE | (1 << BIO_RW_SYNCIO))
 #define SWRITE_SYNC_PLUG       \
                        (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE))
 #define SWRITE_SYNC    (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG))
@@ -304,6 +304,7 @@ struct inodes_stat_t {
 #define BLKIOOPT _IO(0x12,121)
 #define BLKALIGNOFF _IO(0x12,122)
 #define BLKPBSZGET _IO(0x12,123)
+#define BLKDISCARDZEROES _IO(0x12,124)
 
 #define BMAP_IOCTL 1           /* obsolete - kept for compatibility */
 #define FIBMAP    _IO(0x00,1)  /* bmap access */