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ovl: Prepare for mounting case-insensitive enabled layers

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Prepare for mounting layers with case-insensitive dentries in order to
supporting such layers in overlayfs, while enforcing uniform casefold
layers.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Reviewed-by: Gabriel Krisman Bertazi <gabriel@krisman.be>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
André Almeida
2025-08-14 14:22:14 -03:00
committed by Amir Goldstein
parent 23253e278a
commit 5fbf73c7f1
3 changed files with 14 additions and 3 deletions
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1
fs/overlayfs/ovl_entry.h
View File

@@ -91,6 +91,7 @@ struct ovl_fs {
struct mutex whiteout_lock;
/* r/o snapshot of upperdir sb's only taken on volatile mounts */
errseq_t errseq;
bool casefold;
};
/* Number of lower layers, not including data-only layers */

15
fs/overlayfs/params.c
View File

@@ -276,17 +276,26 @@ static int ovl_mount_dir(const char *name, struct path *path)
static int ovl_mount_dir_check(struct fs_context *fc, const struct path *path,
enum ovl_opt layer, const char *name, bool upper)
{
bool is_casefolded = ovl_dentry_casefolded(path->dentry);
struct ovl_fs_context *ctx = fc->fs_private;
struct ovl_fs *ofs = fc->s_fs_info;
if (!d_is_dir(path->dentry))
return invalfc(fc, "%s is not a directory", name);
/*
* Allow filesystems that are case-folding capable but deny composing
* ovl stack from case-folded directories.
* ovl stack from inconsistent case-folded directories.
*/
if (ovl_dentry_casefolded(path->dentry))
return invalfc(fc, "case-insensitive directory on %s not supported", name);
if (!ctx->casefold_set) {
ofs->casefold = is_casefolded;
ctx->casefold_set = true;
}
if (ofs->casefold != is_casefolded) {
return invalfc(fc, "case-%ssensitive directory on %s is inconsistent",
is_casefolded ? "in" : "", name);
}
if (ovl_dentry_weird(path->dentry))
return invalfc(fc, "filesystem on %s not supported", name);

1
fs/overlayfs/params.h
View File

@@ -33,6 +33,7 @@ struct ovl_fs_context {
struct ovl_opt_set set;
struct ovl_fs_context_layer *lower;
char *lowerdir_all; /* user provided lowerdir string */
bool casefold_set;
};
int ovl_init_fs_context(struct fs_context *fc);