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Message-ID: <20240119184742.31088-7-krisman@suse.de> Date: Fri, 19 Jan 2024 15:47:38 -0300 From: Gabriel Krisman Bertazi <krisman@...e.de> To: viro@...iv.linux.org.uk, ebiggers@...nel.org, jaegeuk@...nel.org, tytso@....edu Cc: linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org, amir73il@...il.com, Gabriel Krisman Bertazi <krisman@...e.de> Subject: [PATCH v3 06/10] libfs: Add helper to choose dentry operations at mount 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. Signed-off-by: Gabriel Krisman Bertazi <krisman@...e.de> --- fs/libfs.c | 29 +++++++++++++++++++++++++++++ include/linux/fs.h | 1 + 2 files changed, 30 insertions(+) diff --git a/fs/libfs.c b/fs/libfs.c index c4be0961faf0..9cd4df6969d2 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1822,6 +1822,35 @@ 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_root 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 diff --git a/include/linux/fs.h b/include/linux/fs.h index e6667ece5e64..c985d9392b61 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3202,6 +3202,7 @@ 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) { -- 2.43.0
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