buffer: add BH_Prio and BH_Meta flags

[mirror_ubuntu-artful-kernel.git] / include / linux / buffer_head.h

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 458f497738a445ec96bf2153f2e0f99ee49e3e8c..33c0f8103fe4ac0786d83074c3ac2722a9169090 100644 (file)
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -34,6 +34,8 @@ enum bh_state_bits {
        BH_Write_EIO,   /* I/O error on write */
        BH_Unwritten,   /* Buffer is allocated on disk but not written */
        BH_Quiet,       /* Buffer Error Prinks to be quiet */
+       BH_Meta,        /* Buffer contains metadata */
+       BH_Prio,        /* Buffer should be submitted with REQ_PRIO */
 
        BH_PrivateStart,/* not a state bit, but the first bit available
                         * for private allocation by other entities
@@ -124,9 +126,10 @@ BUFFER_FNS(Delay, delay)
 BUFFER_FNS(Boundary, boundary)
 BUFFER_FNS(Write_EIO, write_io_error)
 BUFFER_FNS(Unwritten, unwritten)
+BUFFER_FNS(Meta, meta)
+BUFFER_FNS(Prio, prio)
 
 #define bh_offset(bh)          ((unsigned long)(bh)->b_data & ~PAGE_MASK)
-#define touch_buffer(bh)       mark_page_accessed(bh->b_page)
 
 /* If we *know* page->private refers to buffer_heads */
 #define page_buffers(page)                                     \
@@ -142,6 +145,7 @@ BUFFER_FNS(Unwritten, unwritten)
 
 void mark_buffer_dirty(struct buffer_head *bh);
 void init_buffer(struct buffer_head *, bh_end_io_t *, void *);
+void touch_buffer(struct buffer_head *bh);
 void set_bh_page(struct buffer_head *bh,
                struct page *page, unsigned long offset);
 int try_to_free_buffers(struct page *);