Commit 70dfe3f0 authored by Gabriel Krisman Bertazi's avatar Gabriel Krisman Bertazi
Browse files

libfs: Add helper to choose dentry operations at mount-time 



In preparation to drop the similar helper that sets d_op at lookup time,
add a version to set the right d_op filesystem-wide, through sb->s_d_op.
The operations structures are shared across filesystems supporting
fscrypt and/or casefolding, therefore we can keep it in common libfs
code.

Reviewed-by: default avatarEric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-7-krisman@suse.de


Signed-off-by: default avatarGabriel Krisman Bertazi <krisman@suse.de>
parent e6ca2883

fs/libfs.c

+28 −0
Original line number Diff line number Diff line
@@ -1818,6 +1818,34 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry) 
}

EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);



/**

 * generic_set_sb_d_ops - helper for choosing the set of

 * filesystem-wide dentry operations for the enabled features

 * @sb: superblock to be configured

 *

 * Filesystems supporting casefolding and/or fscrypt can call this

 * helper at mount-time to configure sb->s_d_op to best set of dentry

 * operations required for the enabled features. The helper must be

 * called after these have been configured, but before the root dentry

 * is created.

 */

void generic_set_sb_d_ops(struct super_block *sb)

{

#if IS_ENABLED(CONFIG_UNICODE)

	if (sb->s_encoding) {

		sb->s_d_op = &generic_ci_dentry_ops;

		return;

	}

#endif

#ifdef CONFIG_FS_ENCRYPTION

	if (sb->s_cop) {

		sb->s_d_op = &generic_encrypted_dentry_ops;

		return;

	}

#endif

}

EXPORT_SYMBOL(generic_set_sb_d_ops);



/**

 * inode_maybe_inc_iversion - increments i_version

 * @inode: inode with the i_version that should be updated

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -3281,6 +3281,7 @@ extern int generic_file_fsync(struct file *, loff_t, loff_t, int); 
extern int generic_check_addressable(unsigned, u64);



extern void generic_set_encrypted_ci_d_ops(struct dentry *dentry);

extern void generic_set_sb_d_ops(struct super_block *sb);



static inline bool sb_has_encoding(const struct super_block *sb)

{