reiserfs: correct mount option parsing to detect when quota options can be changed
We should not allow user to change quota mount options when quota is just
suspended. It would make mount options and internal quota state inconsistent.
Also we should not allow user to change quota format when quota is turned on.
On the other hand we can just silently ignore when some option is set to the
value it already has (some mount versions do this on remount). Finally, we
should not discard current quota options if parsing of mount options fails.
Cc: <reiserfs-devel@vger.kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index f723604..a10a6d2 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -876,7 +876,9 @@
mount options were selected. */
unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
char **jdev_name,
- unsigned int *commit_max_age)
+ unsigned int *commit_max_age,
+ char **qf_names,
+ unsigned int *qfmt)
{
int c;
char *arg = NULL;
@@ -992,7 +994,9 @@
if (c == 'u' || c == 'g') {
int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
- if (sb_any_quota_enabled(s)) {
+ if ((sb_any_quota_enabled(s) ||
+ sb_any_quota_suspended(s)) &&
+ (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
reiserfs_warning(s,
"reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
return 0;
@@ -1011,30 +1015,39 @@
"reiserfs_parse_options: quotafile must be on filesystem root.");
return 0;
}
- REISERFS_SB(s)->s_qf_names[qtype] =
+ qf_names[qtype] =
kmalloc(strlen(arg) + 1, GFP_KERNEL);
- if (!REISERFS_SB(s)->s_qf_names[qtype]) {
+ if (!qf_names[qtype]) {
reiserfs_warning(s,
"reiserfs_parse_options: not enough memory for storing quotafile name.");
return 0;
}
- strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
+ strcpy(qf_names[qtype], arg);
*mount_options |= 1 << REISERFS_QUOTA;
} else {
- kfree(REISERFS_SB(s)->s_qf_names[qtype]);
- REISERFS_SB(s)->s_qf_names[qtype] = NULL;
+ if (qf_names[qtype] !=
+ REISERFS_SB(s)->s_qf_names[qtype])
+ kfree(qf_names[qtype]);
+ qf_names[qtype] = NULL;
}
}
if (c == 'f') {
if (!strcmp(arg, "vfsold"))
- REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
+ *qfmt = QFMT_VFS_OLD;
else if (!strcmp(arg, "vfsv0"))
- REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
+ *qfmt = QFMT_VFS_V0;
else {
reiserfs_warning(s,
"reiserfs_parse_options: unknown quota format specified.");
return 0;
}
+ if ((sb_any_quota_enabled(s) ||
+ sb_any_quota_suspended(s)) &&
+ *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
+ reiserfs_warning(s,
+ "reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
+ return 0;
+ }
}
#else
if (c == 'u' || c == 'g' || c == 'f') {
@@ -1046,9 +1059,8 @@
}
#ifdef CONFIG_QUOTA
- if (!REISERFS_SB(s)->s_jquota_fmt
- && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
- || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
+ if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
+ && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
reiserfs_warning(s,
"reiserfs_parse_options: journaled quota format not specified.");
return 0;
@@ -1130,6 +1142,21 @@
}
}
+#ifdef CONFIG_QUOTA
+static void handle_quota_files(struct super_block *s, char **qf_names,
+ unsigned int *qfmt)
+{
+ int i;
+
+ for (i = 0; i < MAXQUOTAS; i++) {
+ if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
+ kfree(REISERFS_SB(s)->s_qf_names[i]);
+ REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
+ }
+ REISERFS_SB(s)->s_jquota_fmt = *qfmt;
+}
+#endif
+
static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
{
struct reiserfs_super_block *rs;
@@ -1141,23 +1168,30 @@
struct reiserfs_journal *journal = SB_JOURNAL(s);
char *new_opts = kstrdup(arg, GFP_KERNEL);
int err;
+ char *qf_names[MAXQUOTAS];
+ unsigned int qfmt = 0;
#ifdef CONFIG_QUOTA
int i;
+
+ memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
#endif
rs = SB_DISK_SUPER_BLOCK(s);
if (!reiserfs_parse_options
- (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
+ (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
+ qf_names, &qfmt)) {
#ifdef CONFIG_QUOTA
- for (i = 0; i < MAXQUOTAS; i++) {
- kfree(REISERFS_SB(s)->s_qf_names[i]);
- REISERFS_SB(s)->s_qf_names[i] = NULL;
- }
+ for (i = 0; i < MAXQUOTAS; i++)
+ if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
+ kfree(qf_names[i]);
#endif
err = -EINVAL;
goto out_err;
}
+#ifdef CONFIG_QUOTA
+ handle_quota_files(s, qf_names, &qfmt);
+#endif
handle_attrs(s);
@@ -1570,6 +1604,8 @@
char *jdev_name;
struct reiserfs_sb_info *sbi;
int errval = -EINVAL;
+ char *qf_names[MAXQUOTAS] = {};
+ unsigned int qfmt = 0;
save_mount_options(s, data);
@@ -1597,9 +1633,12 @@
jdev_name = NULL;
if (reiserfs_parse_options
(s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
- &commit_max_age) == 0) {
+ &commit_max_age, qf_names, &qfmt) == 0) {
goto error;
}
+#ifdef CONFIG_QUOTA
+ handle_quota_files(s, qf_names, &qfmt);
+#endif
if (blocks) {
SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
@@ -1819,7 +1858,7 @@
return (0);
- error:
+error:
if (jinit_done) { /* kill the commit thread, free journal ram */
journal_release_error(NULL, s);
}
@@ -1830,10 +1869,8 @@
#ifdef CONFIG_QUOTA
{
int j;
- for (j = 0; j < MAXQUOTAS; j++) {
- kfree(sbi->s_qf_names[j]);
- sbi->s_qf_names[j] = NULL;
- }
+ for (j = 0; j < MAXQUOTAS; j++)
+ kfree(qf_names[j]);
}
#endif
kfree(sbi);