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Message-ID: <CAOQ4uxgzT1R-u9-ZFHbW7koFV+o-Ow-k=eAwfKBc18cQe2DW4A@mail.gmail.com>
Date: Fri, 11 Jul 2025 11:20:55 +0200
From: Amir Goldstein <amir73il@...il.com>
To: André Almeida <andrealmeid@...lia.com>
Cc: Miklos Szeredi <miklos@...redi.hu>, Theodore Tso <tytso@....edu>,
Gabriel Krisman Bertazi <krisman@...nel.org>, linux-unionfs@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
kernel-dev@...lia.com
Subject: Re: [PATCH 2/3] ovl: Make ovl_dentry_weird() accept casefold dentries
On Wed, Apr 9, 2025 at 7:11 PM Amir Goldstein <amir73il@...il.com> wrote:
>
> On Wed, Apr 9, 2025 at 5:01 PM André Almeida <andrealmeid@...lia.com> wrote:
> >
> > ovl_dentry_weird() is used to avoid problems with filesystems that has
> > their d_hash and d_compare implementations. Create an exception for this
> > function, where only casefold filesystems are eligible to use their own
> > d_hash and d_compare functions, allowing to support casefold
> > filesystems.
>
> What do you mean by this sentence?
> Any casefold fs can be on any layer?
> All layers on the same casefold sb? same casefold fstype?
>
>
> >
> > Signed-off-by: André Almeida <andrealmeid@...lia.com>
> > ---
> > fs/overlayfs/namei.c | 11 ++++++-----
> > fs/overlayfs/overlayfs.h | 2 +-
> > fs/overlayfs/params.c | 3 ++-
> > fs/overlayfs/util.c | 12 +++++++-----
> > 4 files changed, 16 insertions(+), 12 deletions(-)
> >
> > diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
> > index be5c65d6f8484b1fba6b3fee379ba1d034c0df8a..140bc609ffebe00151cbb446720f5106dbeb2ef2 100644
> > --- a/fs/overlayfs/namei.c
> > +++ b/fs/overlayfs/namei.c
> > @@ -192,7 +192,7 @@ struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
> > return real;
> > }
> >
> > - if (ovl_dentry_weird(real)) {
> > + if (ovl_dentry_weird(real, ofs)) {
> > dput(real);
> > return NULL;
> > }
> > @@ -244,7 +244,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
> > goto out_err;
> > }
> >
> > - if (ovl_dentry_weird(this)) {
> > + if (ovl_dentry_weird(this, ofs)) {
> > /* Don't support traversing automounts and other weirdness */
> > err = -EREMOTE;
> > goto out_err;
> > @@ -365,6 +365,7 @@ static int ovl_lookup_data_layer(struct dentry *dentry, const char *redirect,
> > struct path *datapath)
> > {
> > int err;
> > + struct ovl_fs *ovl = OVL_FS(layer->fs->sb);
>
> ofs please
>
> >
> > err = vfs_path_lookup(layer->mnt->mnt_root, layer->mnt, redirect,
> > LOOKUP_BENEATH | LOOKUP_NO_SYMLINKS | LOOKUP_NO_XDEV,
> > @@ -376,7 +377,7 @@ static int ovl_lookup_data_layer(struct dentry *dentry, const char *redirect,
> > return err;
> >
> > err = -EREMOTE;
> > - if (ovl_dentry_weird(datapath->dentry))
> > + if (ovl_dentry_weird(datapath->dentry, ovl))
> > goto out_path_put;
> >
> > err = -ENOENT;
> > @@ -767,7 +768,7 @@ struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
> >
> > if (ovl_is_whiteout(index))
> > err = -ESTALE;
> > - else if (ovl_dentry_weird(index))
> > + else if (ovl_dentry_weird(index, ofs))
> > err = -EIO;
> > else
> > return index;
> > @@ -815,7 +816,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
> > dput(index);
> > index = ERR_PTR(-ESTALE);
> > goto out;
> > - } else if (ovl_dentry_weird(index) || ovl_is_whiteout(index) ||
> > + } else if (ovl_dentry_weird(index, ofs) || ovl_is_whiteout(index) ||
> > inode_wrong_type(inode, d_inode(origin)->i_mode)) {
> > /*
> > * Index should always be of the same file type as origin
> > diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
> > index 6f2f8f4cfbbc177fbd5441483395d7ff72efe332..f3de013517598c44c15ca9f950f6c2f0a5c2084b 100644
> > --- a/fs/overlayfs/overlayfs.h
> > +++ b/fs/overlayfs/overlayfs.h
> > @@ -445,7 +445,7 @@ void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry,
> > struct ovl_entry *oe);
> > void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
> > struct ovl_entry *oe, unsigned int mask);
> > -bool ovl_dentry_weird(struct dentry *dentry);
> > +bool ovl_dentry_weird(struct dentry *dentry, struct ovl_fs *ovl);
> > enum ovl_path_type ovl_path_type(struct dentry *dentry);
> > void ovl_path_upper(struct dentry *dentry, struct path *path);
> > void ovl_path_lower(struct dentry *dentry, struct path *path);
> > diff --git a/fs/overlayfs/params.c b/fs/overlayfs/params.c
> > index 6759f7d040c89d3b3c01572579c854a900411157..459e8bddf1777c12c9fa0bdfc150e2ea22eaafc3 100644
> > --- a/fs/overlayfs/params.c
> > +++ b/fs/overlayfs/params.c
> > @@ -277,6 +277,7 @@ static int ovl_mount_dir_check(struct fs_context *fc, const struct path *path,
> > enum ovl_opt layer, const char *name, bool upper)
> > {
> > struct ovl_fs_context *ctx = fc->fs_private;
> > + struct ovl_fs *ovl = fc->s_fs_info;
>
> ofs pls
>
> >
> > if (!d_is_dir(path->dentry))
> > return invalfc(fc, "%s is not a directory", name);
> > @@ -290,7 +291,7 @@ static int ovl_mount_dir_check(struct fs_context *fc, const struct path *path,
> > if (sb_has_encoding(path->mnt->mnt_sb))
> > return invalfc(fc, "case-insensitive capable filesystem on %s not supported", name);
I wonder how did your tests pass with this ^^^^
Please rebase your patches on top of:
https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?h=vfs-6.17.file
which changes this test to ovl_dentry_casefolded()
but you need to change this logic anyway.
> >
> > - if (ovl_dentry_weird(path->dentry))
> > + if (ovl_dentry_weird(path->dentry, ovl))
> > return invalfc(fc, "filesystem on %s not supported", name);
> >
> > /*
> > diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
> > index 0819c739cc2ffce0dfefa84d3ff8f9f103eec191..4dd523a1a13ab0a6cf51d967d0b712873e6d8580 100644
> > --- a/fs/overlayfs/util.c
> > +++ b/fs/overlayfs/util.c
> > @@ -200,15 +200,17 @@ void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
> > spin_unlock(&dentry->d_lock);
> > }
> >
> > -bool ovl_dentry_weird(struct dentry *dentry)
> > +bool ovl_dentry_weird(struct dentry *dentry, struct ovl_fs *ovl)
>
> ovl_fs *ofs as first argument please
>
Please don't forget to address those nits also.
Thanks,
Amir.
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