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nsfs: raise DCACHE_DONTCACHE explicitly

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While nsfs dentries are never hashed and thus retain_dentry() will never
consider them for placing them on the LRU it isn't great to always have
to go and remember that. Raise DCACHE_DONTCACHE explicitly as a visual
marker that dentries aren't kept but freed immediately instead.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-3-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-10-29 13:20:16 +01:00
parent 1e9a9be249
commit 6dbe134e4b
1 changed files with 1 additions and 0 deletions
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fs/nsfs.c
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@@ -591,6 +591,7 @@ static int nsfs_init_fs_context(struct fs_context *fc)
struct pseudo_fs_context *ctx = init_pseudo(fc, NSFS_MAGIC);
if (!ctx)
return -ENOMEM;
ctx->s_d_flags |= DCACHE_DONTCACHE;
ctx->ops = &nsfs_ops;
ctx->eops = &nsfs_export_operations;
ctx->dops = &ns_dentry_operations;