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exfat: Implement fileattr_get for case sensitivity

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Report exFAT's case sensitivity behavior via the FS_XFLAG_CASEFOLD
flag. exFAT compares names through the volume's upcase table; in
practice that table folds case, and case is preserved at rest.

Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Roland Mainz <roland.mainz@nrubsig.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://github.com/exfatprogs/exfatprogs/issues/313
Link: https://patch.msgid.link/20260507-case-sensitivity-v14-4-e62cc8200435@oracle.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Chuck Lever 2026-05-07 04:52:57 -04:00 committed by Christian Brauner
parent c92db2ca72
commit 27e0b573dd
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
3 changed files with 19 additions and 2 deletions
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2
fs/exfat/exfat_fs.h
View File

@ -496,6 +496,8 @@ int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
struct kstat *stat, unsigned int request_mask,
unsigned int query_flags);
struct file_kattr;
int exfat_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long exfat_compat_ioctl(struct file *filp, unsigned int cmd,

18
fs/exfat/file.c
View File

@ -14,6 +14,7 @@
#include <linux/writeback.h>
#include <linux/filelock.h>
#include <linux/falloc.h>
#include <linux/fileattr.h>
#include "exfat_raw.h"
#include "exfat_fs.h"
@ -323,6 +324,18 @@ int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
return 0;
}
int exfat_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
{
/*
* exFAT compares filenames through an upcase table, so lookup
* is always case-insensitive. Long names are stored in UTF-16
* with case intact; CASENONPRESERVING stays clear.
*/
fa->fsx_xflags |= FS_XFLAG_CASEFOLD;
fa->flags |= FS_CASEFOLD_FL;
return 0;
}
int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct iattr *attr)
{
@ -817,6 +830,7 @@ const struct file_operations exfat_file_operations = {
};
const struct inode_operations exfat_file_inode_operations = {
.setattr = exfat_setattr,
.getattr = exfat_getattr,
.setattr = exfat_setattr,
.getattr = exfat_getattr,
.fileattr_get = exfat_fileattr_get,
};

1
fs/exfat/namei.c
View File

@ -1311,4 +1311,5 @@ const struct inode_operations exfat_dir_inode_operations = {
.rename = exfat_rename,
.setattr = exfat_setattr,
.getattr = exfat_getattr,
.fileattr_get = exfat_fileattr_get,
};