X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Ffilemap.c;h=4a2fee2cb62bad714491e1e910406ecd66dc2557;hb=8e2894e51d6407e47226a60c0d19bf384642c55a;hp=c085af2332d87c81e53fe05dbcbd7202616cbf4c;hpb=cd7619d6bf36564cf54ff7218ef54e558a741913;p=linux-2.6

diff --git a/mm/filemap.c b/mm/filemap.c
index c085af2332..4a2fee2cb6 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -29,11 +29,6 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 /*
- * This is needed for the following functions:
- *  - try_to_release_page
- *  - block_invalidatepage
- *  - generic_osync_inode
- *
  * FIXME: remove all knowledge of the buffer layer from the core VM
  */
 #include <linux/buffer_head.h> /* for generic_osync_inode */
@@ -169,9 +164,10 @@ static int sync_page(void *word)
 /**
  * filemap_fdatawrite_range - start writeback against all of a mapping's
  * dirty pages that lie within the byte offsets <start, end>
- * @mapping: address space structure to write
- * @start: offset in bytes where the range starts
- * @end : offset in bytes where the range ends
+ * @mapping:	address space structure to write
+ * @start:	offset in bytes where the range starts
+ * @end:	offset in bytes where the range ends
+ * @sync_mode:	enable synchronous operation
  *
  * If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
  * opposed to a regular memory * cleansing writeback.  The difference between
@@ -535,8 +531,8 @@ EXPORT_SYMBOL(find_trylock_page);
 /**
  * find_lock_page - locate, pin and lock a pagecache page
  *
- * @mapping - the address_space to search
- * @offset - the page index
+ * @mapping: the address_space to search
+ * @offset: the page index
  *
  * Locates the desired pagecache page, locks it, increments its reference
  * count and returns its address.
@@ -575,9 +571,9 @@ EXPORT_SYMBOL(find_lock_page);
 /**
  * find_or_create_page - locate or add a pagecache page
  *
- * @mapping - the page's address_space
- * @index - the page's index into the mapping
- * @gfp_mask - page allocation mode
+ * @mapping: the page's address_space
+ * @index: the page's index into the mapping
+ * @gfp_mask: page allocation mode
  *
  * Locates a page in the pagecache.  If the page is not present, a new page
  * is allocated using @gfp_mask and is added to the pagecache and to the VM's
@@ -1008,7 +1004,7 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 		if (pos < size) {
 			retval = generic_file_direct_IO(READ, iocb,
 						iov, pos, nr_segs);
-			if (retval >= 0 && !is_sync_kiocb(iocb))
+			if (retval > 0 && !is_sync_kiocb(iocb))
 				retval = -EIOCBQUEUED;
 			if (retval > 0)
 				*ppos = pos + retval;
@@ -1972,6 +1968,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 	do {
 		unsigned long index;
 		unsigned long offset;
+		unsigned long maxlen;
 		size_t copied;
 
 		offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
@@ -1986,7 +1983,10 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 		 * same page as we're writing to, without it being marked
 		 * up-to-date.
 		 */
-		fault_in_pages_readable(buf, bytes);
+		maxlen = cur_iov->iov_len - iov_base;
+		if (maxlen > bytes)
+			maxlen = bytes;
+		fault_in_pages_readable(buf, maxlen);
 
 		page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
 		if (!page) {
@@ -2028,6 +2028,8 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 					filemap_set_next_iovec(&cur_iov,
 							&iov_base, status);
 					buf = cur_iov->iov_base + iov_base;
+				} else {
+					iov_base += status;
 				}
 			}
 		}