[PATCH] Fix and add EXPORT_SYMBOL(filemap_write_and_wait)

This patch add EXPORT_SYMBOL(filemap_write_and_wait) and use it.

See mm/filemap.c:

And changes the filemap_write_and_wait() and filemap_write_and_wait_range().

Current filemap_write_and_wait() doesn't wait if filemap_fdatawrite()
returns error.  However, even if filemap_fdatawrite() returned an
error, it may have submitted the partially data pages to the device.
(e.g. in the case of -ENOSPC)

<quotation>
Andrew Morton writes,

If filemap_fdatawrite() returns an error, this might be due to some
I/O problem: dead disk, unplugged cable, etc.  Given the generally
crappy quality of the kernel's handling of such exceptions, there's a
good chance that the filemap_fdatawait() will get stuck in D state
forever.
</quotation>

So, this patch doesn't wait if filemap_fdatawrite() returns the -EIO.

Trond, could you please review the nfs part?  Especially I'm not sure,
nfs must use the "filemap_fdatawrite(inode->i_mapping) == 0", or not.

Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 28201b194f53..31b4aa13dd4b 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -265,8 +265,7 @@ int diSync(struct inode *ipimap)
         /*
          * write out dirty pages of imap
          */
-        filemap_fdatawrite(ipimap->i_mapping);
-        filemap_fdatawait(ipimap->i_mapping);
+        filemap_write_and_wait(ipimap->i_mapping);
 
         diWriteSpecial(ipimap, 0);
 
@@ -565,8 +564,7 @@ void diFreeSpecial(struct inode *ip)
                 jfs_err("diFreeSpecial called with NULL ip!");
                 return;
         }
-        filemap_fdatawrite(ip->i_mapping);
-        filemap_fdatawait(ip->i_mapping);
+        filemap_write_and_wait(ip->i_mapping);
         truncate_inode_pages(ip->i_mapping, 0);
         iput(ip);
 }