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| author | Alexander Larsson <alexl@redhat.com> | 2023-06-21 11:32:31 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-08-12 19:02:38 +0300 |
| commit | bf07089081a0ea18da4a103b9d813ffae3c2f6d8 (patch) | |
| tree | 4402aa478356f3d607045ddf43b04bd7c910b82b /fs/overlayfs/namei.c | |
| parent | ae8cba4033bc16e8a07792428a48a50710cc0f3c (diff) | |
| download | linux-bf07089081a0ea18da4a103b9d813ffae3c2f6d8.tar.xz | |
ovl: Add versioned header for overlay.metacopy xattr
Historically overlay.metacopy was a zero-size xattr, and it's
existence marked a metacopy file. This change adds a versioned header
with a flag field, a length and a digest. The initial use-case of this
will be for validating a fs-verity digest, but the flags field could
also be used later for other new features.
ovl_check_metacopy_xattr() now returns the size of the xattr,
emulating a size of OVL_METACOPY_MIN_SIZE for empty xattrs to
distinguish it from the no-xattr case.
Signed-off-by: Alexander Larsson <alexl@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'fs/overlayfs/namei.c')
| -rw-r--r-- | fs/overlayfs/namei.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index 57adf911735f..3dd480253710 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -25,7 +25,7 @@ struct ovl_lookup_data { bool stop; bool last; char *redirect; - bool metacopy; + int metacopy; /* Referring to last redirect xattr */ bool absolute_redirect; }; @@ -270,7 +270,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d, d->stop = true; goto put_and_out; } - err = ovl_check_metacopy_xattr(OVL_FS(d->sb), &path); + err = ovl_check_metacopy_xattr(OVL_FS(d->sb), &path, NULL); if (err < 0) goto out_err; @@ -963,7 +963,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, .stop = false, .last = ovl_redirect_follow(ofs) ? false : !ovl_numlower(poe), .redirect = NULL, - .metacopy = false, + .metacopy = 0, }; if (dentry->d_name.len > ofs->namelen) @@ -1120,7 +1120,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, /* Defer lookup of lowerdata in data-only layers to first access */ if (d.metacopy && ctr && ofs->numdatalayer && d.absolute_redirect) { - d.metacopy = false; + d.metacopy = 0; ctr++; } @@ -1211,7 +1211,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, upperredirect = NULL; goto out_free_oe; } - err = ovl_check_metacopy_xattr(ofs, &upperpath); + err = ovl_check_metacopy_xattr(ofs, &upperpath, NULL); if (err < 0) goto out_free_oe; uppermetacopy = err; |