The HPFS filesystem used generic_show_options to produce string that is
displayed in /proc/mounts. However, there is problem that the options may
disappear after remount. If we mount the filesystem with option1 and then
remount it with option2, /proc/mounts should show both option1 and
option2, however it only shows option2 because the whole option string is
replaced with replace_mount_options in hpfs_remount_fs.
To fix this bug, implement the hpfs_show_options function that prints
options that are currently selected.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
fs/hpfs/super.c | 43 ++++++++++++++++++++++++++++++++-----------
1 file changed, 32 insertions(+), 11 deletions(-)
Index: linux-4.6/fs/hpfs/super.c
===================================================================
--- linux-4.6.orig/fs/hpfs/super.c 2016-05-23 19:02:35.000000000 +0200
+++ linux-4.6/fs/hpfs/super.c 2016-05-23 19:18:22.000000000 +0200
@@ -15,6 +15,7 @@
#include <linux/sched.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
+#include <linux/seq_file.h>
/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
@@ -455,10 +456,6 @@ static int hpfs_remount_fs(struct super_
int lowercase, eas, chk, errs, chkdsk, timeshift;
int o;
struct hpfs_sb_info *sbi = hpfs_sb(s);
- char *new_opts = kstrdup(data, GFP_KERNEL);
-
- if (data && !new_opts)
- return -ENOMEM;
sync_filesystem(s);
@@ -495,18 +492,44 @@ static int hpfs_remount_fs(struct super_
if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
- if (new_opts)
- replace_mount_options(s, new_opts);
-
hpfs_unlock(s);
return 0;
out_err:
hpfs_unlock(s);
- kfree(new_opts);
return -EINVAL;
}
+static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
+
+ seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
+ seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
+ seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
+ if (sbi->sb_lowercase)
+ seq_printf(seq, ",case=lower");
+ if (!sbi->sb_chk)
+ seq_printf(seq, ",check=none");
+ if (sbi->sb_chk == 2)
+ seq_printf(seq, ",check=strict");
+ if (!sbi->sb_err)
+ seq_printf(seq, ",errors=continue");
+ if (sbi->sb_err == 2)
+ seq_printf(seq, ",errors=panic");
+ if (!sbi->sb_chkdsk)
+ seq_printf(seq, ",chkdsk=no");
+ if (sbi->sb_chkdsk == 2)
+ seq_printf(seq, ",chkdsk=always");
+ if (!sbi->sb_eas)
+ seq_printf(seq, ",eas=no");
+ if (sbi->sb_eas == 1)
+ seq_printf(seq, ",eas=ro");
+ if (sbi->sb_timeshift)
+ seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
+ return 0;
+}
+
/* Super operations */
static const struct super_operations hpfs_sops =
@@ -517,7 +540,7 @@ static const struct super_operations hpf
.put_super = hpfs_put_super,
.statfs = hpfs_statfs,
.remount_fs = hpfs_remount_fs,
- .show_options = generic_show_options,
+ .show_options = hpfs_show_options,
};
static int hpfs_fill_super(struct super_block *s, void *options, int silent)
@@ -540,8 +563,6 @@ static int hpfs_fill_super(struct super_
int o;
- save_mount_options(s, options);
-
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi) {
return -ENOMEM;
--
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