On 8/30/11 5:12 PM, Bernd Schubert wrote: > On 08/17/2011 11:57 AM, Bernd Schubert wrote: >> With the ext3/ext4 directory index implementation hashes are used to specify >> offsets for llseek(). For compatibility with NFSv2 and 32-bit user space >> on 64-bit systems (kernel space) ext3/ext4 currently only return 32-bit >> hashes and therefore the probability of hash collisions for larger directories >> is rather high. As recently reported on the NFS mailing list that theoretical >> problem also happens on real systems: >> http://comments.gmane.org/gmane.linux.nfs/40863 >> >> The following series adds two new f_mode flags to tell ext4 >> to use 32-bit or 64-bit hash values for llseek() calls. >> These flags can then used by network file systems, such as NFS, to >> request 32-bit or 64-bit offsets (hashes). >> >> Version 4 >> - Andreas noticed there was HAVE_IS_COMPAT_TASK instead of >> CONFIG_COMPAT in the >> "Return 32/64-bit dir name hash according to usage type" >> patch >> >> Version 3: >> - remove patch "RFC: Remove check for a 32-bit cookie in nfsd4_readdir()", >> I think Bruce wanted to take it seperately as bug fix. It should be applied >> before applying the remaining NFS patches, as without it NFSv4 will always >> fail with the new 64-bit ext4 seek hashes. >> - split "nfsd: vfs_llseek() with 32 or 64 bit offsets (hashes)" into two >> two separate patches as suggested by Bruce, one patch to rename >> 'access' to 'may_flags'. And the remainder of the original patch to set >> FMODE_32BITHASH/FMODE_64BITHASH flags and to introduce the new >> NFSD_MAY_64BIT_COOKIE flag >> >> Version 2: >> - use f_mode instead of O_* flags and also in a separate patch >> - introduce EXT4_HTREE_EOF_32BIT and EXT4_HTREE_EOF_64BIT >> - fix SEEK_END in ext4_dir_llseek() >> - set f_mode flags in NFS code as early as possible and introduce a new >> NFSD_MAY_64BIT_COOKIE flag for that >> > > Ted, > > any chance you could take this series or at least ack the ext4 part? Bruce already acked the NFS patches. > > > Acked-by: J. Bruce Fields <bfields@xxxxxxxxxx> > Ted, what is the status of these patches for ext4 at this point? -eric > > Thanks, > Bernd > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
