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Date: Mon, 01 Apr 2013 10:13:39 -0500 From: Eric Sandeen <sandeen@...hat.com> To: Jan Kara <jack@...e.cz> CC: ext4 development <linux-ext4@...r.kernel.org>, Anand Avati <avati@...hat.com> Subject: Re: [PATCH, RFC V2] ext3: add ioctl to force 32-bit hashes from indexed dirs On 3/29/13 6:43 AM, Jan Kara wrote: > On Thu 28-03-13 15:40:20, Eric Sandeen wrote: >> This adds a new ioctl, EXT3_IOC_32BITHASH, which allows a >> userspace application to request 32-bit rather than 64-bit >> hashes from readdir on an indexed / dx / htree directory. >> >> Gluster had been relying on the top bits of the d_off being >> free; there are some reports that filling all 64 bits breaks >> Samba as well. The infrastructure to return 32-bit hashes >> already exists; NFS can turn it on, and it's turned on for >> 32-bit processes as well. So it's just a matter of flipping >> on the f_mode flag before readdir starts. >> >> Care needs to be taken that we don't change the FMODE flag >> after readdir has been started, so we make sure that >> filp->private_data has not yet been set before we set the flag. >> (Thanks Zach!). >> >> Pre-submission-fixes-by: Zach Brown <zab@...hat.com> >> Signed-off-by: Eric Sandeen <sandeen@...hat.com> >> --- >> >> V2: >> fix "readir" typo >> rename goto target to *_out like others >> remove parameter; we can't really ever turn this back off once it's used. >> closing and reopening is the only way to get back to 64 bit hashes. > Looks good. Just one nit below: Oh, of course, duh! I'll send V3, thanks. -Eric >> diff --git a/fs/ext3/ext3.h b/fs/ext3/ext3.h >> + case EXT3_IOC_32BITHASH: { >> + int err = 0; >> + >> + /* Serialize with readdir */ >> + if ((err = mutex_lock_killable(&inode->i_mutex))) >> + return err; >> + >> + /* protect f_mode */ >> + spin_lock(&filp->f_lock); >> + >> + /* Only valid for htree directories */ >> + if (!S_ISDIR(inode->i_mode) || !is_dx_dir(inode)) { > Won't it be better to return ENOTDIR in !S_ISDIR case? > >> + err = -EINVAL; >> + goto hash32bits_out; >> + } >> + >> + /* Have we already started readdir on this dx dir? */ >> + if (filp->private_data) { >> + err = -EINVAL; > And here maybe EBUSY, but in this case I'm really undecided. > >> + goto hash32bits_out; >> + } >> + >> + filp->f_mode |= FMODE_32BITHASH; >> +hash32bits_out: >> + spin_unlock(&filp->f_lock); >> + mutex_unlock(&inode->i_mutex); >> + return err; >> + } >> case FITRIM: { >> >> struct super_block *sb = inode->i_sb; > > Honza > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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