fs/quota/dquot.c

Source file repositories/reference/linux-study-clean/fs/quota/dquot.c

File Facts

System
Linux kernel
Corpus path
fs/quota/dquot.c
Extension
.c
Size
84353 bytes
Lines
3076
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dquot_warn {
	struct super_block *w_sb;
	struct kqid w_dq_id;
	short w_type;
};

static int warning_issued(struct dquot *dquot, const int warntype)
{
	int flag = (warntype == QUOTA_NL_BHARDWARN ||
		warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
		((warntype == QUOTA_NL_IHARDWARN ||
		warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);

	if (!flag)
		return 0;
	return test_and_set_bit(flag, &dquot->dq_flags);
}

#ifdef CONFIG_PRINT_QUOTA_WARNING
static int flag_print_warnings = 1;

static int need_print_warning(struct dquot_warn *warn)
{
	if (!flag_print_warnings)
		return 0;

	switch (warn->w_dq_id.type) {
		case USRQUOTA:
			return uid_eq(current_fsuid(), warn->w_dq_id.uid);
		case GRPQUOTA:
			return in_group_p(warn->w_dq_id.gid);
		case PRJQUOTA:
			return 1;
	}
	return 0;
}

/* Print warning to user which exceeded quota */
static void print_warning(struct dquot_warn *warn)
{
	char *msg = NULL;
	struct tty_struct *tty;
	int warntype = warn->w_type;

	if (warntype == QUOTA_NL_IHARDBELOW ||
	    warntype == QUOTA_NL_ISOFTBELOW ||
	    warntype == QUOTA_NL_BHARDBELOW ||
	    warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
		return;

	tty = get_current_tty();
	if (!tty)
		return;
	tty_write_message(tty, warn->w_sb->s_id);
	if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
		tty_write_message(tty, ": warning, ");
	else
		tty_write_message(tty, ": write failed, ");
	tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
	switch (warntype) {
		case QUOTA_NL_IHARDWARN:
			msg = " file limit reached.\r\n";
			break;
		case QUOTA_NL_ISOFTLONGWARN:
			msg = " file quota exceeded too long.\r\n";
			break;
		case QUOTA_NL_ISOFTWARN:
			msg = " file quota exceeded.\r\n";
			break;
		case QUOTA_NL_BHARDWARN:
			msg = " block limit reached.\r\n";
			break;
		case QUOTA_NL_BSOFTLONGWARN:
			msg = " block quota exceeded too long.\r\n";
			break;
		case QUOTA_NL_BSOFTWARN:
			msg = " block quota exceeded.\r\n";
			break;
	}
	tty_write_message(tty, msg);
	tty_kref_put(tty);
}
#endif

static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
			    int warntype)
{
	if (warning_issued(dquot, warntype))
		return;
	warn->w_type = warntype;

Annotation

Implementation Notes