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From: Xiubo Li <xiubli@redhat.com>
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Date: Mon, 16 May 2022 11:23:19 +0800
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Subject: fs/dcache: export d_same_name() helper
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Git-commit: 4f48d5da81ee7004a789c8aac2d0dfb2514c37f1
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Patch-mainline: v6.0-rc1
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References: jsc#SES-1880
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Compare dentry name with case-exact name, return true if names
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are same, or false.
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Signed-off-by: Xiubo Li <xiubli@redhat.com>
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Reviewed-by: Jeff Layton <jlayton@kernel.org>
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Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
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Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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Acked-by: Luis Henriques <lhenriques@suse.de>
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---
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fs/dcache.c | 15 +++++++++++----
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include/linux/dcache.h | 2 ++
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2 files changed, 13 insertions(+), 4 deletions(-)
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diff --git a/fs/dcache.c b/fs/dcache.c
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index 93f4f5ee07bf..a409312ee0df 100644
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--- a/fs/dcache.c
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+++ b/fs/dcache.c
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@@ -2247,10 +2247,16 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
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}
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EXPORT_SYMBOL(d_add_ci);
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-
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-static inline bool d_same_name(const struct dentry *dentry,
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- const struct dentry *parent,
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- const struct qstr *name)
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+/**
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+ * d_same_name - compare dentry name with case-exact name
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+ * @parent: parent dentry
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+ * @dentry: the negative dentry that was passed to the parent's lookup func
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+ * @name: the case-exact name to be associated with the returned dentry
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+ *
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+ * Return: true if names are same, or false
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+ */
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+bool d_same_name(const struct dentry *dentry, const struct dentry *parent,
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+ const struct qstr *name)
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{
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if (likely(!(parent->d_flags & DCACHE_OP_COMPARE))) {
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if (dentry->d_name.len != name->len)
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@@ -2261,6 +2267,7 @@ static inline bool d_same_name(const struct dentry *dentry,
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dentry->d_name.len, dentry->d_name.name,
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name) == 0;
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}
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+EXPORT_SYMBOL_GPL(d_same_name);
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/**
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* __d_lookup_rcu - search for a dentry (racy, store-free)
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diff --git a/include/linux/dcache.h b/include/linux/dcache.h
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index f5bba51480b2..bb72361834de 100644
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--- a/include/linux/dcache.h
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+++ b/include/linux/dcache.h
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@@ -233,6 +233,8 @@ extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *,
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wait_queue_head_t *);
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extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
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extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
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+extern bool d_same_name(const struct dentry *dentry, const struct dentry *parent,
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+ const struct qstr *name);
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extern struct dentry * d_exact_alias(struct dentry *, struct inode *);
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extern struct dentry *d_find_any_alias(struct inode *inode);
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extern struct dentry * d_obtain_alias(struct inode *);
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