From: Tyler Hicks Date: Fri, 22 Apr 2011 18:08:00 +0000 (-0500) Subject: eCryptfs: Flush dirty pages in setattr X-Git-Tag: v5.15~25572^2 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=5be79de2e1ffa19d871a494697cf76cddee93384;p=mirror_ubuntu-kernels.git eCryptfs: Flush dirty pages in setattr After 57db4e8d73ef2b5e94a3f412108dff2576670a8a changed eCryptfs to write-back caching, eCryptfs page writeback updates the lower inode times due to the use of vfs_write() on the lower file. To preserve inode metadata changes, such as 'cp -p' does with utimensat(), we need to flush all dirty pages early in ecryptfs_setattr() so that the user-updated lower inode metadata isn't clobbered later in writeback. https://bugzilla.kernel.org/show_bug.cgi?id=33372 Reported-by: Rocko Signed-off-by: Tyler Hicks --- diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 2c19d362d2d4..4d4cc6a90cd5 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -929,6 +929,12 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) } } mutex_unlock(&crypt_stat->cs_mutex); + if (S_ISREG(inode->i_mode)) { + rc = filemap_write_and_wait(inode->i_mapping); + if (rc) + goto out; + fsstack_copy_attr_all(inode, lower_inode); + } memcpy(&lower_ia, ia, sizeof(lower_ia)); if (ia->ia_valid & ATTR_FILE) lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);