[PATCH v4 51/54] get rid of kill_litter_super()

Al Viro
2025-11-18T05:18:58Z

Not used anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
Documentation/filesystems/porting.rst | 7 +++++++
fs/dcache.c | 21 ---------------------
fs/internal.h | 1 -
fs/super.c | 8 --------
include/linux/dcache.h | 1 -
include/linux/fs.h | 1 -
6 files changed, 7 insertions(+), 32 deletions(-)

diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index 7233b04668fc..4921b3b0662a 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -1309,3 +1309,10 @@ a different length, use
vfs_parse_fs_qstr(fc, key, &QSTR_LEN(value, len))

instead.
+
+---
+
+**mandatory**
+
+kill_litter_super() is gone; convert to DCACHE_PERSISTENT use (as all
+in-tree filesystems have done).
diff --git a/fs/dcache.c b/fs/dcache.c
index 3cc6c3876177..5ee2e78a91b3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3167,27 +3167,6 @@ bool is_subdir(struct dentry *new_dentry, struct dentry *old_dentry)
}
EXPORT_SYMBOL(is_subdir);

-static enum d_walk_ret d_genocide_kill(void *data, struct dentry *dentry)
-{
- struct dentry *root = data;
- if (dentry != root) {
- if (d_unhashed(dentry) || !dentry->d_inode ||
- dentry->d_flags & DCACHE_PERSISTENT)
- return D_WALK_SKIP;
-
- if (!(dentry->d_flags & DCACHE_GENOCIDE)) {
- dentry->d_flags |= DCACHE_GENOCIDE;
- dentry->d_lockref.count--;
- }
- }
- return D_WALK_CONTINUE;
-}
-
-void d_genocide(struct dentry *parent)
-{
- d_walk(parent, parent, d_genocide_kill);
-}
-
void d_mark_tmpfile(struct file *file, struct inode *inode)
{
struct dentry *dentry = file->f_path.dentry;
diff --git a/fs/internal.h b/fs/internal.h
index 9b2b4d116880..144686af6c36 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -227,7 +227,6 @@ extern void shrink_dcache_for_umount(struct super_block *);
extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
const struct qstr *name, unsigned *seq);
-extern void d_genocide(struct dentry *);

/*
* pipe.c
diff --git a/fs/super.c b/fs/super.c
index 5bab94fb7e03..ee001f684d2a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1284,14 +1284,6 @@ void kill_anon_super(struct super_block *sb)
}
EXPORT_SYMBOL(kill_anon_super);

-void kill_litter_super(struct super_block *sb)
-{
- if (sb->s_root)
- d_genocide(sb->s_root);
- kill_anon_super(sb);
-}
-EXPORT_SYMBOL(kill_litter_super);
-
int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)
{
return set_anon_super(sb, NULL);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 6ec4066825e3..20a85144a00e 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -198,7 +198,6 @@ enum dentry_flags {
DCACHE_REFERENCED = BIT(6), /* Recently used, don't discard. */
DCACHE_DONTCACHE = BIT(7), /* Purge from memory on final dput() */
DCACHE_CANT_MOUNT = BIT(8),
- DCACHE_GENOCIDE = BIT(9),
DCACHE_SHRINK_LIST = BIT(10),
DCACHE_OP_WEAK_REVALIDATE = BIT(11),
/*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f5037c556f61..95933ceaae51 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2728,7 +2728,6 @@ void retire_super(struct super_block *sb);
void generic_shutdown_super(struct super_block *sb);
void kill_block_super(struct super_block *sb);
void kill_anon_super(struct super_block *sb);
-void kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
void deactivate_locked_super(struct super_block *sb);
int set_anon_super(struct super_block *s, void *data);
--
2.47.3