* [PATCH] exfat: implement "quiet" option for setattr
@ 2020-06-27 12:55 ` Park Ju Hyung
2020-07-02 5:16 ` Namjae Jeon
0 siblings, 1 reply; 4+ messages in thread
From: Park Ju Hyung @ 2020-06-27 12:55 UTC (permalink / raw)
To: linux-fsdevel; +Cc: Park Ju Hyung, Namjae Jeon, Sungjong Seo, open list
Few programs, especially old ones, simply don't want to work
if there isn't a POSIX-compliant setattr.
Follow vfat and implement a new "quiet" option to workaround this.
Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
---
fs/exfat/exfat_fs.h | 2 ++
fs/exfat/file.c | 13 +++++++++++--
fs/exfat/super.c | 7 +++++++
3 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 3aed8e22087a..66837baf42d2 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -201,6 +201,8 @@ struct exfat_mount_options {
unsigned short allow_utime;
/* charset for filename input/display */
char *iocharset;
+ /* fake return success on setattr(e.g. chmods/chowns) */
+ unsigned char quiet;
/* on error: continue, panic, remount-ro */
enum exfat_error_mode errors;
unsigned utf8:1, /* Use of UTF-8 character set */
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 6707f3eb09b5..2ed6be7cab15 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -295,7 +295,7 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
attr->ia_size > i_size_read(inode)) {
error = exfat_cont_expand(inode, attr->ia_size);
if (error || attr->ia_valid == ATTR_SIZE)
- return error;
+ goto out;
attr->ia_valid &= ~ATTR_SIZE;
}
@@ -309,8 +309,11 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
error = setattr_prepare(dentry, attr);
attr->ia_valid = ia_valid;
- if (error)
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
goto out;
+ }
if (((attr->ia_valid & ATTR_UID) &&
!uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
@@ -322,6 +325,12 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
goto out;
}
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
+ goto out;
+ }
+
/*
* We don't return -EPERM here. Yes, strange, but this is too
* old behavior.
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index b5bf6dedbe11..030db33eed35 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -145,6 +145,8 @@ static int exfat_show_options(struct seq_file *m, struct dentry *root)
seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask);
if (opts->allow_utime)
seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
+ if (opts->quiet)
+ seq_puts(m, ",quiet");
if (opts->utf8)
seq_puts(m, ",iocharset=utf8");
else if (sbi->nls_io)
@@ -198,6 +200,7 @@ enum {
Opt_fmask,
Opt_allow_utime,
Opt_charset,
+ Opt_quiet,
Opt_errors,
Opt_discard,
Opt_time_offset,
@@ -224,6 +227,7 @@ static const struct fs_parameter_spec exfat_parameters[] = {
fsparam_u32oct("fmask", Opt_fmask),
fsparam_u32oct("allow_utime", Opt_allow_utime),
fsparam_string("iocharset", Opt_charset),
+ fsparam_flag("quiet", Opt_quiet),
fsparam_enum("errors", Opt_errors, exfat_param_enums),
fsparam_flag("discard", Opt_discard),
fsparam_s32("time_offset", Opt_time_offset),
@@ -274,6 +278,9 @@ static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
opts->iocharset = param->string;
param->string = NULL;
break;
+ case Opt_quiet:
+ opts->quiet = 1;
+ break;
case Opt_errors:
opts->errors = result.uint_32;
break;
--
2.27.0
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