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: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20240221171412.10710-7-krisman@suse.de Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
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fs/libfs.c
28
fs/libfs.c
@ -1818,6 +1818,34 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry)
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}
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EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);
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/**
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* generic_set_sb_d_ops - helper for choosing the set of
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* filesystem-wide dentry operations for the enabled features
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* @sb: superblock to be configured
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*
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* Filesystems supporting casefolding and/or fscrypt can call this
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* helper at mount-time to configure sb->s_d_op to best set of dentry
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* operations required for the enabled features. The helper must be
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* called after these have been configured, but before the root dentry
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* is created.
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*/
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void generic_set_sb_d_ops(struct super_block *sb)
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{
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#if IS_ENABLED(CONFIG_UNICODE)
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if (sb->s_encoding) {
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sb->s_d_op = &generic_ci_dentry_ops;
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return;
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}
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#endif
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#ifdef CONFIG_FS_ENCRYPTION
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if (sb->s_cop) {
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sb->s_d_op = &generic_encrypted_dentry_ops;
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return;
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}
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#endif
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}
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EXPORT_SYMBOL(generic_set_sb_d_ops);
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/**
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* inode_maybe_inc_iversion - increments i_version
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* @inode: inode with the i_version that should be updated
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@ -3281,6 +3281,7 @@ extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
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extern int generic_check_addressable(unsigned, u64);
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extern void generic_set_encrypted_ci_d_ops(struct dentry *dentry);
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extern void generic_set_sb_d_ops(struct super_block *sb);
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static inline bool sb_has_encoding(const struct super_block *sb)
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{
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