X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Ffilemap.c;h=b5346576e58d252ea63224606bd2564cb2f088fa;hb=05c45ca9aa4ec57e8e22341633c7a98cc879423d;hp=7332194d7afddfd816e27eaec2eebb17a4059a24;hpb=ceffc078528befc008c6f2c2c4decda79eabd534;p=pandora-kernel.git

diff --git a/mm/filemap.c b/mm/filemap.c
index 7332194d7afd..b5346576e58d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -37,6 +37,10 @@
 #include <asm/uaccess.h>
 #include <asm/mman.h>
 
+static ssize_t
+generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
+	loff_t offset, unsigned long nr_segs);
+
 /*
  * Shared mappings implemented 30.11.1994. It's not fully working yet,
  * though.
@@ -54,9 +58,8 @@
  *
  *  ->i_mmap_lock		(vmtruncate)
  *    ->private_lock		(__free_pte->__set_page_dirty_buffers)
- *      ->swap_list_lock
- *        ->swap_device_lock	(exclusive_swap_page, others)
- *          ->mapping->tree_lock
+ *      ->swap_lock		(exclusive_swap_page, others)
+ *        ->mapping->tree_lock
  *
  *  ->i_sem
  *    ->i_mmap_lock		(truncate->unmap_mapping_range)
@@ -86,7 +89,7 @@
  *    ->page_table_lock		(anon_vma_prepare and various)
  *
  *  ->page_table_lock
- *    ->swap_device_lock	(try_to_unmap_one)
+ *    ->swap_lock		(try_to_unmap_one)
  *    ->private_lock		(try_to_unmap_one)
  *    ->tree_lock		(try_to_unmap_one)
  *    ->zone.lru_lock		(follow_page->mark_page_accessed)
@@ -302,8 +305,9 @@ EXPORT_SYMBOL(sync_page_range);
  * as it forces O_SYNC writers to different parts of the same file
  * to be serialised right until io completion.
  */
-int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
-			loff_t pos, size_t count)
+static int sync_page_range_nolock(struct inode *inode,
+				  struct address_space *mapping,
+				  loff_t pos, size_t count)
 {
 	pgoff_t start = pos >> PAGE_CACHE_SHIFT;
 	pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
@@ -318,7 +322,6 @@ int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
 		ret = wait_on_page_writeback_range(mapping, start, end);
 	return ret;
 }
-EXPORT_SYMBOL(sync_page_range_nolock);
 
 /**
  * filemap_fdatawait - walk the list of under-writeback pages of the given
@@ -1505,8 +1508,12 @@ repeat:
 		return -EINVAL;
 
 	page = filemap_getpage(file, pgoff, nonblock);
+
+	/* XXX: This is wrong, a filesystem I/O error may have happened. Fix that as
+	 * done in shmem_populate calling shmem_getpage */
 	if (!page && !nonblock)
 		return -ENOMEM;
+
 	if (page) {
 		err = install_page(mm, vma, addr, page, prot);
 		if (err) {
@@ -1514,6 +1521,9 @@ repeat:
 			return err;
 		}
 	} else {
+		/* No page was found just because we can't read it in now (being
+		 * here implies nonblock != 0), but the page may exist, so set
+		 * the PTE to fault it in later. */
 		err = install_file_pte(mm, vma, addr, pgoff, prot);
 		if (err)
 			return err;
@@ -1851,8 +1861,11 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
 	 * i_sem is held, which protects generic_osync_inode() from
 	 * livelocking.
 	 */
-	if (written >= 0 && file->f_flags & O_SYNC)
-		generic_osync_inode(inode, mapping, OSYNC_METADATA);
+	if (written >= 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
+		int err = generic_osync_inode(inode, mapping, OSYNC_METADATA);
+		if (err < 0)
+			written = err;
+	}
 	if (written == count && !is_sync_kiocb(iocb))
 		written = -EIOCBQUEUED;
 	return written;
@@ -1951,7 +1964,9 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 				if (unlikely(nr_segs > 1)) {
 					filemap_set_next_iovec(&cur_iov,
 							&iov_base, status);
-					buf = cur_iov->iov_base + iov_base;
+					if (count)
+						buf = cur_iov->iov_base +
+							iov_base;
 				} else {
 					iov_base += status;
 				}
@@ -1997,7 +2012,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 }
 EXPORT_SYMBOL(generic_file_buffered_write);
 
-ssize_t
+static ssize_t
 __generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
 				unsigned long nr_segs, loff_t *ppos)
 {
@@ -2097,7 +2112,7 @@ generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
 	return ret;
 }
 
-ssize_t
+static ssize_t
 __generic_file_write_nolock(struct file *file, const struct iovec *iov,
 				unsigned long nr_segs, loff_t *ppos)
 {
@@ -2218,7 +2233,7 @@ EXPORT_SYMBOL(generic_file_writev);
  * Called under i_sem for writes to S_ISREG files.   Returns -EIO if something
  * went wrong during pagecache shootdown.
  */
-ssize_t
+static ssize_t
 generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 	loff_t offset, unsigned long nr_segs)
 {
@@ -2253,4 +2268,3 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 	}
 	return retval;
 }
-EXPORT_SYMBOL_GPL(generic_file_direct_IO);