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Message-ID: <87jznxs68r.fsf@mailhost.krisman.be> Date: Thu, 25 Jan 2024 13:55:00 -0300 From: Gabriel Krisman Bertazi <krisman@...e.de> To: Eric Biggers <ebiggers@...nel.org> Cc: viro@...iv.linux.org.uk, jaegeuk@...nel.org, tytso@....edu, linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org, amir73il@...il.com Subject: Re: [PATCH v3 01/10] ovl: Reject mounting case-insensitive filesystems Eric Biggers <ebiggers@...nel.org> writes: > On Fri, Jan 19, 2024 at 03:47:33PM -0300, Gabriel Krisman Bertazi wrote: >> ovl: Reject mounting case-insensitive filesystems > > Overlayfs doesn't mount filesystems. I think you might mean something like > reject case-insensitive lowerdirs? uppers and workdir too. I'd make this: "ovl: Reject mounting over case-insensitive filesystems" > >> + /* >> + * Root dentries of case-insensitive filesystems might not have >> + * the dentry operations set, but still be incompatible with >> + * overlayfs. Check explicitly to prevent post-mount failures. >> + */ >> + if (sb_has_encoding(path->mnt->mnt_sb)) >> + return invalfc(fc, "case-insensitive filesystem on %s not supported", name); > > sb_has_encoding() doesn't mean that the filesystem is case-insensitive. It > means that the filesystem supports individual case-insensitive > directories. > > With that in mind, is this code still working as intended? > Yes, it is. In particular, after the rest of the patchset, any dentry will be weird and lookups will throw -EREMOTE. > If so, can you update the comment and error message accordingly? I'm not sure how to change and still make it readable by users. How about: return invalfc(fc, "case-insensitive capable filesystem on %s not supported", name); what do you think? -- Gabriel Krisman Bertazi
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