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Subject[PATCH 2/6] fs/9p: call vmtruncate before setattr 9p opeation
Date
We need to call vmtruncate before 9p setattr operation, otherwise we
could write back some dirty pages between setattr with ATTR_SIZE and vmtruncate
causing some truncated pages to be written back to server

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/vfs_inode.c | 10 ++++------
fs/9p/vfs_inode_dotl.c | 9 ++++-----
2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 64f2e4e..7c60011 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -996,18 +996,16 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
if (iattr->ia_valid & ATTR_GID)
wstat.n_gid = iattr->ia_gid;
}
-
- retval = p9_client_wstat(fid, &wstat);
- if (retval < 0)
- return retval;
-
- v9fs_invalidate_inode_attr(dentry->d_inode);
if ((iattr->ia_valid & ATTR_SIZE) &&
iattr->ia_size != i_size_read(dentry->d_inode)) {
retval = vmtruncate(dentry->d_inode, iattr->ia_size);
if (retval)
return retval;
}
+ retval = p9_client_wstat(fid, &wstat);
+ if (retval < 0)
+ return retval;
+ v9fs_invalidate_inode_attr(dentry->d_inode);

setattr_copy(dentry->d_inode, iattr);
mark_inode_dirty(dentry->d_inode);
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 2826026..b14d740 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -456,17 +456,16 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
if (IS_ERR(fid))
return PTR_ERR(fid);

- retval = p9_client_setattr(fid, &p9attr);
- if (retval < 0)
- return retval;
-
- v9fs_invalidate_inode_attr(dentry->d_inode);
if ((iattr->ia_valid & ATTR_SIZE) &&
iattr->ia_size != i_size_read(dentry->d_inode)) {
retval = vmtruncate(dentry->d_inode, iattr->ia_size);
if (retval)
return retval;
}
+ retval = p9_client_setattr(fid, &p9attr);
+ if (retval < 0)
+ return retval;
+ v9fs_invalidate_inode_attr(dentry->d_inode);

setattr_copy(dentry->d_inode, iattr);
mark_inode_dirty(dentry->d_inode);
--
1.7.1


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