docs/vfs: update references to i_mutex to i_rwsem

VFS has switched to i_rwsem for ten years now (9902af79c01a: parallel
lookups actual switch to rwsem), but the VFS documentation and comments
still has references to i_mutex.

Signed-off-by: Junxuan Liao <ljx@cs.wisc.edu>
Link: https://lore.kernel.org/72223729-5471-474a-af3c-f366691fba82@cs.wisc.edu
Signed-off-by: Christian Brauner <brauner@kernel.org>

4 files changed, 7 insertions, 7 deletions

diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 25c4a5afbd44..cfb0dd1ea49c 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -230,7 +230,7 @@ struct handle_to_path_ctx {
  *    directory.  The name should be stored in the @name (with the
  *    understanding that it is already pointing to a %NAME_MAX+1 sized
  *    buffer.   get_name() should return %0 on success, a negative error code
- *    or error.  @get_name will be called without @parent->i_mutex held.
+ *    or error.  @get_name will be called without @parent->i_rwsem held.
  *
  * get_parent:
  *    @get_parent should find the parent directory for the given @child which
@@ -247,7 +247,7 @@ struct handle_to_path_ctx {
  *    @commit_metadata should commit metadata changes to stable storage.
  *
  * Locking rules:
- *    get_parent is called with child->d_inode->i_mutex down
+ *    get_parent is called with child->d_inode->i_rwsem down
  *    get_name is not (which is possibly inconsistent)
  */
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1d9586a78041..09e3e80b0528 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -837,7 +837,7 @@ static inline void inode_fake_hash(struct inode *inode)
 }
 
 /*
- * inode->i_mutex nesting subclasses for the lock validator:
+ * inode->i_rwsem nesting subclasses for the lock validator:
  *
  * 0: the object of the current VFS operation
  * 1: parent
@@ -989,7 +989,7 @@ static inline loff_t i_size_read(const struct inode *inode)
 
 /*
  * NOTE: unlike i_size_read(), i_size_write() does need locking around it
- * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
+ * (normally i_rwsem), otherwise on 32bit/SMP an update of i_size_seqcount
  * can be lost, resulting in subsequent i_size_read() calls spinning forever.
  */
 static inline void i_size_write(struct inode *inode, loff_t i_size)
@@ -1921,7 +1921,7 @@ static inline void sb_end_intwrite(struct super_block *sb)
  * freeze protection should be the outermost lock. In particular, we have:
  *
  * sb_start_write
- *   -> i_mutex			(write path, truncate, directory ops, ...)
+ *   -> i_rwsem			(write path, truncate, directory ops, ...)
  *   -> s_umount		(freeze_super, thaw_super)
  */
 static inline void sb_start_write(struct super_block *sb)
diff --git a/include/linux/fs_stack.h b/include/linux/fs_stack.h
index 2b1f74b24070..0cc2fa283305 100644
--- a/include/linux/fs_stack.h
+++ b/include/linux/fs_stack.h
@@ -3,7 +3,7 @@
 #define _LINUX_FS_STACK_H
 
 /* This file defines generic functions used primarily by stackable
- * filesystems; none of these functions require i_mutex to be held.
+ * filesystems; none of these functions require i_rwsem to be held.
  */
 
 #include <linux/fs.h>
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 06cc8888199e..c334f82ed385 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -19,7 +19,7 @@ static inline struct quota_info *sb_dqopt(struct super_block *sb)
 	return &sb->s_dquot;
 }
 
-/* i_mutex must being held */
+/* i_rwsem must being held */
 static inline bool is_quota_modification(struct mnt_idmap *idmap,
 					 struct inode *inode, struct iattr *ia)
 {