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tmpfs: preserve SB_I_VERSION on remount

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Now tmpfs enables i_version by default and tmpfs does not modify it.  But
SB_I_VERSION can also be modified via sb_flags, and reconfigure_super()
always overwrites the existing flags with the latest ones.  This means
that if tmpfs is remounted without specifying iversion, the default
i_version will be unexpectedly disabled.

To ensure iversion remains enabled, SB_I_VERSION is now always set for
fc->sb_flags in shmem_init_fs_context(), instead of for sb->s_flags in
shmem_fill_super().

Link: https://lkml.kernel.org/r/20250819061803.1496443-1-libaokun@huaweicloud.com
Fixes: 36f05cab0a ("tmpfs: add support for an i_version counter")
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baokun Li
2025-08-19 14:18:03 +08:00
committed by Andrew Morton
parent c55ed758e0
commit 63ec0c26b6
1 changed files with 4 additions and 1 deletions
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5
mm/shmem.c
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@@ -5081,7 +5081,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_flags |= SB_NOUSER;
}
sb->s_export_op = &shmem_export_ops;
sb->s_flags |= SB_NOSEC | SB_I_VERSION;
sb->s_flags |= SB_NOSEC;
#if IS_ENABLED(CONFIG_UNICODE)
if (!ctx->encoding && ctx->strict_encoding) {
@@ -5385,6 +5385,9 @@ int shmem_init_fs_context(struct fs_context *fc)
fc->fs_private = ctx;
fc->ops = &shmem_fs_context_ops;
#ifdef CONFIG_TMPFS
fc->sb_flags |= SB_I_VERSION;
#endif
return 0;
}