[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>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 14a1c72..5ade53d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -127,8 +127,7 @@
if (file->f_dentry->d_inode->i_mapping) {
/* BB no need to lock inode until after invalidate
since namei code should already have it locked? */
- filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
- filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
+ filemap_write_and_wait(file->f_dentry->d_inode->i_mapping);
}
cFYI(1, ("invalidating remote inode since open detected it "
"changed"));
@@ -419,8 +418,7 @@
pCifsInode = CIFS_I(inode);
if (pCifsInode) {
if (can_flush) {
- filemap_fdatawrite(inode->i_mapping);
- filemap_fdatawait(inode->i_mapping);
+ filemap_write_and_wait(inode->i_mapping);
/* temporarily disable caching while we
go to server to get inode info */
pCifsInode->clientCanCacheAll = FALSE;