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authorChristian Brauner <brauner@kernel.org>2022-02-03 14:14:07 +0100
committerChristian Brauner <brauner@kernel.org>2022-02-14 08:35:32 +0100
commit538f4f022a4612f969d5324ee227403c9f8b1d72 (patch)
tree24cc403cda6118284ef57618944efefeab45dafe /fs/namespace.c
parent97acd701185b13825f8ec7882345040415d46762 (diff)
fs: add kernel doc for mnt_{hold,unhold}_writers()
When I introduced mnt_{hold,unhold}_writers() in commit fbdc2f6c40f6 ("fs: split out functions to hold writers") I did not add kernel doc for them. Fix this and introduce proper documentation. Link: https://lore.kernel.org/r/20220203131411.3093040-4-brauner@kernel.org Fixes: fbdc2f6c40f6 ("fs: split out functions to hold writers") Cc: Seth Forshee <seth.forshee@digitalocean.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 40b994a29e90..de6fae84f1a1 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -469,6 +469,24 @@ void mnt_drop_write_file(struct file *file)
}
EXPORT_SYMBOL(mnt_drop_write_file);
+/**
+ * mnt_hold_writers - prevent write access to the given mount
+ * @mnt: mnt to prevent write access to
+ *
+ * Prevents write access to @mnt if there are no active writers for @mnt.
+ * This function needs to be called and return successfully before changing
+ * properties of @mnt that need to remain stable for callers with write access
+ * to @mnt.
+ *
+ * After this functions has been called successfully callers must pair it with
+ * a call to mnt_unhold_writers() in order to stop preventing write access to
+ * @mnt.
+ *
+ * Context: This function expects lock_mount_hash() to be held serializing
+ * setting MNT_WRITE_HOLD.
+ * Return: On success 0 is returned.
+ * On error, -EBUSY is returned.
+ */
static inline int mnt_hold_writers(struct mount *mnt)
{
mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
@@ -500,6 +518,18 @@ static inline int mnt_hold_writers(struct mount *mnt)
return 0;
}
+/**
+ * mnt_unhold_writers - stop preventing write access to the given mount
+ * @mnt: mnt to stop preventing write access to
+ *
+ * Stop preventing write access to @mnt allowing callers to gain write access
+ * to @mnt again.
+ *
+ * This function can only be called after a successful call to
+ * mnt_hold_writers().
+ *
+ * Context: This function expects lock_mount_hash() to be held.
+ */
static inline void mnt_unhold_writers(struct mount *mnt)
{
/*