Eddie Horng: > e. in step 8, mkdir invokes nfs_lookup_revalidate > f. server side again run into: nfsd -> nfsd_lookup -> aufs::aufs_encode_fh > g. this time, aufs_encode_fh returns filehander of folderA in br0(rw) > i. in nfs_lookup_revalidate, nfs_compare_fh(NFS_FH(inode), fhandle) is > called after revalidate, and the filehandler of folderA changes, 0x4100... > -> 0x4000... > j. finally in dcache.c filename_create->lookup_dcache->d_invalidate drop > the dentry of folderA
No, d_invalidate() doesn't call d_drop(folderA) since it is a positive dentry. When nfs_compare_fh(NFS_FH(inode), fhandle) fails, VFS lookup it again, and may_create() returns EEXIST. Isn't there "if (!dentry->d_inode)" condition in your d_invalidate()? > k. getcwd then failed on the unlinked dentry of folderA No, it should not fail nor it is not unlinked. I have confirmed on Ubuntu-4.10.0-34.38 kernel. The kernel configuration is for my test environment, so it must be different from yours. But I am not sure whether the config is related. J. R. Okajima ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
